TWI885014B - paper container - Google Patents

Abstract

When opening a paper container, in order to obtain: the upper end of the body plate is surely recessed so that the paper container can be easily opened, and the paper container will not be deformed when the paper container is formed, in the body plate (7) on the opening side connected to the side wall forming plate (23) on the opening side through the top transverse fold line (25), the body plate On the longitudinal fold lines (3, 4) of the trunk on both sides of (7), there are provided: a first auxiliary fold line (43) which is formed in a downward curved line shape and is located at a reference point (40) which is more than 3 mm away from the intersection point (39) of the end of the longitudinal fold line (3, 4) of the trunk and the end of the top transverse fold line (25), and the end of the first auxiliary fold line (43) is The reference points (40) are arranged in a manner of being connected to each other, or in a manner of being connected to each other near the reference point (40) and on the longitudinal fold line (3, 4) of the trunk or at a position away from the longitudinal fold line (3, 4) of the trunk and at a height direction below the reference point (40), wherein the ends (41, 42) of the first auxiliary fold line (43) that are connected to each other near the reference point (40) and on the longitudinal fold line (3, 4) of the trunk or at a position away from the longitudinal fold line (3, 4) of the trunk and at a height direction below the above-mentioned reference point (40) are more than 3 mm away from the intersection (39) and within a length range of less than 20% of the length of the top transverse fold line (25).

Description

paper container

The present invention relates to a paper container for storing liquid contents.

In the past, paper containers for storing liquid contents such as milk or juice were widely used: they were formed of a paperboard material with thermoplastic resin laminated on the front and back sides, and had four body plates, and the edges were connected by longitudinal sealing plates to form a square cylindrical body. At the upper end of the body plate, there were: a top sealing plate with an outer side and facing each other. A pair of gable roof forming plates, and a pair of side wall forming plates having an inner top layer sealing plate at the upper part and facing each other so that either side can be opened to form an outlet. A pair of side wall forming plates are folded between the pair of gable roof forming plates, and the outer top layer sealing plate and the inner top layer sealing plate are heat-sealed at predetermined positions to form a gable roof-shaped paper container at the top.

The opening of such a gable roof-shaped paper container is carried out by placing fingers in the space opened between a pair of gable roof forming plates, a body plate and a side wall forming plate, and spreading the fingers to the left and right after leaning against the side wall forming plates, so as to peel off the heat-sealed facing surfaces of the outer top layer sealing plate and the inner top layer sealing plate on the opening side, and then, pull out the above-mentioned side wall forming plate folded between the pair of gable roof forming plates, and fold back outward from the top transverse fold line that is the boundary with the body plate connected through the top transverse fold line to open the pouring outlet. However, when the user's hands are large, when the paper container is small, or when the height of the top of the gable roof type is lowered for the purpose of saving space, the space formed between the body plate and the side wall forming plate is narrow, so there will be a problem that it is difficult to put the fingers on the side wall forming plate, and the opening operation cannot be easily performed.

In recent years, it has become known that there is a gabled roof type paper container in which, for a side wall forming plate that is pulled out when the paper container is opened and a body plate connected to the side wall forming plate, an auxiliary fold line is provided near a top transverse fold line that is located at a boundary with the side wall forming plate, and the fold line lowers from one end of the top transverse fold line toward the other end toward the center of the body plate (for example, refer to patent document 1).

According to the mountain-shaped roof-shaped paper container provided with such an auxiliary fold line, when the top corner of the body formed by the top transverse fold line is pressed toward the inside of the container, the top corner will bend toward the inside of the container from the auxiliary fold line, and the upper part of the body plate sandwiched by the top transverse fold line and the opening auxiliary line will be concave toward the inside of the container. As a result, when opening, the space for inserting fingers when the fingers are placed against the side wall forming plate becomes wider, so it becomes easier to open the paper container. [Prior technical literature] [Patent literature]

Patent document 1: Japanese Patent Application Publication No. 2002-234524

[The problem the invention is trying to solve]

However, in the paper container described in Patent Document 1, since the end of the auxiliary fold line is connected to the end of the top transverse fold line, when the mountain-shaped roof-shaped top of the paper container is formed, when the pressure for mountain folding from the top transverse fold line is applied, the force is transmitted to the auxiliary fold line, and the auxiliary fold line also mountain folds, which may cause the problem of defective products with distorted shape. In addition, the bending position of the top corner will be different depending on the pressing position of the top corner. As a result, the width of the space formed by the upper part of the body plate sandwiched by the top transverse fold line and the auxiliary fold line is not constant, and there is a problem that it is difficult to put fingers in. Furthermore, when opening the paper container, the top corner of the body formed by the top horizontal fold line is pressed toward the inside of the container and folded inward. However, since the top corner acts as a rib, a strong force is required to fold the top corner of the body inward. As a result, the paper container opening operation may be difficult for the elderly, women, and children who have weak strength.

The present invention was made in view of the above-mentioned problems and the position and shape of the auxiliary fold line for making the body plate concave when the spout is formed in the body is repeatedly studied, thereby completing the present invention.

The purpose of the present invention is to provide a paper container that can easily be opened by surely and with little force making the upper end of the body plate concave when the paper container is opened, and that will not cause shape distortion when the paper container is formed. [Means for solving the problem]

In order to achieve the above-mentioned purpose, the invention described in claim 1 is directed to: a paperboard material with thermoplastic resin laminated on the front and back sides, having four body panels, and the edges of which are connected by longitudinal sealing panels to form a square cylindrical body, and at the upper end of the above-mentioned body panels, there are: a pair of gable roof forming panels having outer top sealing panels on the upper part and facing each other, and a pair of inner top sealing panels on the upper part and facing each other. A pair of side wall forming plates facing each other and capable of being opened at either side to form a pouring outlet, the pair of side wall forming plates being folded between the pair of gable roof forming plates, and the outer top layer sealing plate and the inner top layer sealing plate being heat-sealed at predetermined positions to form a gable roof-shaped paper container at the top, wherein: in the body plate of the opening side of the side wall forming plate connected to the opening side through the top transverse fold line, the upper part of the opening side is On the longitudinal fold lines of the trunk on both sides of the trunk plate, there are provided: a first auxiliary fold line which is formed in a downward curved line shape and is separated from a reference point at least 3 mm from the intersection of the end of the longitudinal fold line of the trunk and the end of the top transverse fold line, and the end of the first auxiliary fold line is arranged in a manner connecting the reference points to each other, or in a manner that the end of the first auxiliary fold line is arranged in the vicinity of the reference point and on the longitudinal fold line of the trunk or at a position separated from the longitudinal fold line of the trunk. The first auxiliary fold line is arranged in a manner that the ends of the first auxiliary fold lines that are connected to each other near the reference point and on the longitudinal fold line of the torso or at a position away from the longitudinal fold line of the torso and below the reference point in the height direction are more than 3 mm away from the intersection and within a range of a length that is less than 20% of the length of the top transverse fold line.

According to the invention described in claim 1, in the trunk plate on the opening side of the above-mentioned side wall forming plate connected to the opening side through the top transverse fold line, on the trunk longitudinal fold lines on both sides of the above-mentioned trunk plate on the opening side, there are provided: a first auxiliary fold line formed in a downward curved shape at a reference point more than 3 mm away from the intersection of the end of the above-mentioned trunk longitudinal fold line and the end of the above-mentioned top transverse fold line, the end of the first auxiliary fold line is arranged in a manner of connecting the above-mentioned reference points to each other, or in a manner of connecting the above-mentioned reference points near the above-mentioned reference points and on the above-mentioned trunk longitudinal fold line or at a position away from the above-mentioned trunk longitudinal fold line and below the above-mentioned reference point in the height direction, wherein the first auxiliary fold line is arranged in a manner of connecting the above-mentioned reference points to each other, or in a manner of connecting the above-mentioned reference points near the above-mentioned reference points and on the above-mentioned trunk longitudinal fold line or at a position away from the above-mentioned trunk longitudinal fold line and below the above-mentioned reference point in the height direction, wherein the first auxiliary fold line is arranged in a manner of connecting the above-mentioned reference points to each other at a position more than 3 mm away from the intersection of the end of the above-mentioned trunk longitudinal fold line and the end of the top transverse fold line The ends of the first auxiliary fold lines connected to each other near the intersection point and on the body longitudinal fold line or at a position away from the body longitudinal fold line and below the reference point in the height direction are more than 3 mm away from the intersection point and within a length range of less than 20% of the length of the top transverse fold line. Therefore, when the mountain-shaped roof-shaped top of the paper container is formed, when the mountain-folding pressure from the top transverse fold line is applied, it is possible to prevent the bending load-bearing portion between the top transverse fold line of the body plate and the end side of the first auxiliary fold line from being compressed with a small force, and on the other hand, it is possible to prevent the situation where a large force such as labor is required to compress it. Thus, when the mountain-shaped roof-shaped top of the paper container is formed, since the pressure for mountain folding from the top transverse folding line is applied, the bending load bearing portion between the top transverse folding line of the body plate and the end side of the first auxiliary folding line will not be compressed and bent with a small force, so the situation of defective products with distorted shape caused by mountain folding from the first auxiliary folding line can be effectively prevented. Furthermore, when the paper container is opened, the bending load-bearing portion between the top transverse fold line of the body plate and the end side of the first auxiliary fold line is compressed without much force, so the top corner of the cylindrical body can be easily pressed in, thereby folding the body plate from the first auxiliary fold line, and the bending load-bearing portion between the top transverse fold line of the body plate and the end side of the first auxiliary fold line can be compressed to cause the upper end of the body plate to be concave. Next, by making the upper end of the body plate concave, the top corner is bent toward the inside of the container, and when opening, the space for inserting fingers when the fingers are placed against the side wall forming plate becomes wider, so that the paper container can be easily opened. In addition, by compressing the bending load-bearing portion between the upper transverse fold line of the body plate and the end side of the first auxiliary fold line, the deformed portion becomes a damper and can maintain the concave state of the upper end of the body plate, so that the paper container can be easily opened.

The invention described in claim 2 is a paper container as described in claim 1, wherein the reference point is 3 to 4 mm away from the intersection in the vertical direction, and the end of the first auxiliary fold line is 5 to 6 mm away from the intersection.

According to the invention described in claim 2, since the reference point is 3 to 4 mm away from the intersection in the vertical direction, and the end of the first auxiliary fold line is 5 to 6 mm away from the intersection, the bending load bearing portion between the top transverse fold line of the body plate and the end of the first auxiliary fold line will not bend with a small force, and the paper When the mountain-shaped roof-shaped top of the container is formed, when the pressure is applied from the horizontal fold line of the top to cause the mountain fold, it can be more effectively prevented that the force is transmitted to the first auxiliary fold line, and the shape of the defective product is distorted due to the mountain fold from the first auxiliary fold line. Moreover, when the paper container is opened, it does not require a lot of force to be bent, and the paper container can be opened easily.

The invention described in claim 3 is a paper container as described in claim 1 or 2, wherein the first auxiliary folding line that is curved downward is in the shape of an arc, a V-shape, a polygon, or a combination thereof.

According to the invention described in claim 3, since the above-mentioned first auxiliary fold line is in the shape of an arc, a V-shape, a polygon or a combination thereof, when the paper container is opened, when the top corner or the vicinity of the top corner of the above-mentioned cylindrical body formed by bending the above-mentioned top horizontal fold line is pressed, the above-mentioned body plate can be easily mountain folded from the above-mentioned first auxiliary fold line, and the upper end portion of the above-mentioned body plate can be easily recessed.

The invention described in claim 4 is a paper container as described in any one of claims 1 to 3, wherein the first auxiliary folding line is a continuous line.

According to the invention described in claim 4, since the first auxiliary folding line is a continuous line, even if the square meter weight of the paperboard material forming the paper container is very large, the body board can be easily mountain-folded from the first auxiliary folding line.

The invention described in claim 5 is a paper container as described in any one of claims 1 to 3, wherein the first auxiliary folding line is a discontinuous line.

According to the invention described in claim 5, since the first auxiliary fold line is a non-continuous line, even if the square meter weight of the paper board material forming the paper container is very small, the first auxiliary fold line formed on the body board will not reduce the strength of the paper container, and the necessary strength as a paper container can be maintained.

The invention described in claim 6 is a paper container as described in any one of claims 1 to 5, wherein the lowest point of the curve of the above-mentioned first auxiliary folding line is located at the left-right center of the above-mentioned body plate on the opening side.

According to the invention described in claim 6, since the lowest point of the curve of the above-mentioned first auxiliary folding line is located at the left-right center of the above-mentioned body plate on the opening side, the lowest point of the space formed by concavely expanding the upper end of the above-mentioned body plate between the above-mentioned pair of gable roofs, the above-mentioned body plate on the opening side and the above-mentioned side wall forming plate on the opening side is arranged vertically with the top of the space, and the shape of the space can be made into a shape that is easy for fingers to be inserted.

The invention described in claim 7 is a paper container as described in any one of claims 1 to 6, wherein the first auxiliary folding line is symmetrical to the left and right.

According to the invention described in claim 7, since the above-mentioned first auxiliary folding line is formed symmetrically on the left and right, the shape of the space formed by the above-mentioned pair of gable roofs, the above-mentioned body plate on the opening side and the above-mentioned side wall forming plate on the opening side, which is expanded by making the above-mentioned body plate concave, becomes symmetrical on the left and right, and the shape of the space can be made into a shape that is easy for fingers to be inserted.

The invention recorded in claim 8 is a paper container as described in any one of claims 1 to 7, wherein the roughly triangular surface portion of the above-mentioned side wall forming plate on the opening side, or the roughly triangular surface portion of the above-mentioned side wall forming plate on the opening side and the above-mentioned body plate on the opening side, form: a second auxiliary fold line extending longitudinally in the central portion in the horizontal direction.

According to the invention described in claim 8, since the approximately triangular surface of the side wall forming plate on the opening side, or the approximately triangular surface of the side wall forming plate on the opening side and the body plate on the opening side, form a second auxiliary fold line extending longitudinally in the middle of the horizontal direction, when the top corner of the tubular body is pressed in during the opening of the paper container, the approximately triangular surface or the approximately triangular surface and the body plate can be induced by the second auxiliary fold line to valley fold from the second auxiliary fold line, and the center of the top corner of the tubular body is bent toward the inside of the paper container. Thus, since the center of the top corner of the cylindrical body can be easily bent toward the inside of the paper container, the roughly triangular face portion and the upper end of the body plate can be easily depressed with a small pressing force. Then, since the bending position of the top corner is constant due to the second auxiliary folding line, the width of the space of the side wall forming plate on the opening side formed by the depression of the roughly triangular face portion and the upper end of the body plate is constant.

The invention recorded in claim 9 is a paper container as claimed in claim 8, wherein the lower side end portion of the second auxiliary fold line located on the side in the direction of the lowest point of the first auxiliary fold line is located at the lowest point of the first auxiliary fold line or near the lowest point, and the upper side end portion located on the side in the direction of the vertex of the roughly triangular face portion is located at the vertex of the roughly triangular face portion or near the vertex.

According to the invention recorded in claim 9, the lower side end portion of the second auxiliary fold line located on the lowermost point side of the first auxiliary fold line is located at the lowermost point of the first auxiliary fold line or near the lowermost point, and the upper side end portion located on the vertex side of the roughly triangular face portion is located at the vertex or near the vertex of the roughly triangular face portion, so that the body plate and the roughly triangular face portion can be more easily recessed.

The invention recorded in claim 10 is a paper container as described in any one of claims 1 to 9, wherein a punctuation display portion indicating a pressed punctuation is provided at the center of the above-mentioned top horizontal fold line or in the vicinity of the above-mentioned approximately triangular surface portion and the above-mentioned body plate, or at either of the above-mentioned approximately triangular surface portion and the above-mentioned body plate.

According to the invention described in claim 10, a punctuation mark display portion indicating a pressed punctuation mark is provided at or near the center of the top horizontal fold line, spanning the roughly triangular surface portion and the above-mentioned body plate, or at or near the above-mentioned roughly triangular surface portion and the above-mentioned body plate. Therefore, when the paper container is opened, the center of or near the top corner of the above-mentioned cylindrical body can be accurately pressed in by means of the punctuation mark display portion.

The invention described in claim 11 is a paper container as described in claim 10, wherein the punctuation display portion is formed by embossing.

According to the invention described in claim 11, since the punctuation mark display portion is formed by embossing, even in a case where the punctuation mark display portion is difficult to see, the punctuation mark display portion can be easily confirmed by touch. In addition, by visually recognizing the embossing, the paper container can be given a new design effect.

The invention recorded in claim 12 is a paper container as described in any one of claims 1 to 11, wherein the upper edge of the inner top layer sealing plate connected to the upper part of the side wall forming plate on the side that can be opened to form a pouring outlet is in a straight line shape.

According to the invention recorded in claim 12, since the upper edge of the above-mentioned inner top layer sealing plate connected to the upper part of the above-mentioned side wall forming plate on the side that can be opened into a pouring outlet is in a straight line shape, the sealing area of the above-mentioned inner top layer sealing plate and the above-mentioned outer top layer sealing plate connected to the upper part of the above-mentioned pair of gable roof forming plates located on both sides of the above-mentioned inner top layer sealing plate is very small, the above-mentioned inner top layer sealing plate and the above-mentioned outer top layer sealing plate can be easily peeled off, and the above-mentioned paper container can be easily opened.

The invention recorded in claim 13 is a paper container as described in any one of claims 1 to 12, wherein a first easy-to-peel-off area is provided on the inner surface of the above-mentioned inner top layer sealing plate on the upper part of the above-mentioned side wall forming plate connected to the side that can be opened into a pouring outlet, and a second easy-to-peel-off area overlapping with the above-mentioned first easy-to-peel-off area is provided on the inner surface of the above-mentioned outer top layer sealing plate located on both sides thereof and connected to the upper part of the above-mentioned pair of gable roof forming plates, in a portion approximately half of the transverse length direction and close to the above-mentioned inner top layer sealing plate.

According to the invention described in claim 13, since a first easy-to-peel-off area is provided on the inner surface of the inner top layer sealing plate on the upper part of the side wall forming plate connected to the side of the openable pouring outlet, and a second easy-to-peel-off area overlapping with the first easy-to-peel-off area is provided on the inner surface of the outer top layer sealing plate located on both sides thereof and connected to the upper part of the pair of gable roof forming plates, the inner top layer sealing plate and the outer top layer sealing plate can be easily peeled off, and the paper container can be easily opened.

The invention described in claim 14 is a paper container as described in claim 13, wherein the first easy-to-peel-off area is provided at both ends of the inner top layer sealing plate in the transverse length direction, leaving end sealing areas of a predetermined transverse width, and the second easy-to-peel-off area is provided at both ends of the inner top layer sealing plate, leaving end sealing areas of a predetermined transverse width close to the inner top layer sealing plate, and the first easy-to-peel-off area and the second easy-to-peel-off area are provided at both ends of the first easy-to-peel-off area and at the end of the second easy-to-peel-off area close to the inner top layer sealing plate, respectively, with an extension portion inclined in a manner that the side of the body plate becomes longer from top to bottom.

According to the invention described in claim 14, the first easy-peeling area is provided at both ends of the inner top sealing plate in the transverse direction, leaving end sealing areas of a predetermined transverse width, and the second easy-peeling area is provided near the inner top sealing plate, leaving end sealing areas of a predetermined transverse width, and at both ends of the first easy-peeling area and at the end of the second easy-peeling area near the inner top sealing plate, there are: The extension portion is inclined in a manner of lengthening the side of the body plate downward, so that the upper side of the extension portion of the first easy-to-peel-off area and the second easy-to-peel-off area is inclined in a direction along the peeling direction of the end sealing area of the inner top layer sealing plate and the outer top layer sealing plate when the side wall forming plate is pulled out. The end sealing area of the inner top layer sealing plate and the outer top layer sealing plate can be easily peeled off, and the opening of the paper container becomes easy.

The invention described in claim 15 is a paper container as described in any one of claims 1 to 14, wherein the transverse width of the body plate is less than 57 mm.

According to the invention described in claim 15, even if the transverse width of the body plate of the small paper container is less than 57 mm, a wide space for inserting fingers can be formed by the side wall forming plate on the opening side so that fingers can be placed against the side wall when the paper container is opened.

The invention recorded in claim 16 is a paper container as described in any one of claims 1 to 15, wherein a straw spout is provided on the gable roof forming plate, and the straw spout is composed of a first half cut formed from the back side to serve as a straw insertion port and a second half cut formed from the front side in a manner surrounding the first half cut.

According to the invention described in claim 16, since a straw spout is provided on the gable roof forming plate, the straw spout is formed by a first half cut formed from the back side to become a straw insertion port and a second half cut formed from the front side to surround the first half cut, so in addition to the formation of the spout, liquid contents stored in the paper container can also be taken out by a straw. [Effect of the invention]

As described above, according to the paper container of the present invention, a paper container can be obtained in which the upper end of the body plate can be surely depressed with very little force during opening, thereby making the paper container easy to open, and there is no risk of shape distortion when the paper container is formed.

[Implementation form of the invention]

The following is a detailed description of the form of the paper container for implementing the present invention with reference to the drawings. Figures 1 to 7 show the first example of the implementation form of the paper container of the present invention. Figure 1 is a plan view of the paperboard material of the paper container of the first example. Figure 2 is an explanatory diagram showing other examples of the end configuration position of the first auxiliary fold line shown in Figure 1. Figures 3, 4, 5, and 6 are explanatory diagrams showing other examples of the shape of the first auxiliary fold line shown in Figure 1. Figure 7 is a side view of a paper container formed by the paperboard material shown in Figure 1. Figure 8 is an enlarged explanatory diagram showing the side of the state in which the first auxiliary fold line of the paper container shown in Figure 7 is bent and the body is concave. Figure 9 is a three-dimensional diagram of the paper container shown in Figure 8.

The first example of a paper container is formed by a paperboard material 1 with thermoplastic resin laminated on the front and back sides as shown in FIG. The paperboard material 1 has four body panels 5, 6, 7, and 8 connected through body longitudinal fold lines 2, 3, and 4. When forming the paper container, the four body panels 5, 6, 7, and 8 are joined by a longitudinal sealing panel 10 connected to the body panel 8 through a body longitudinal fold line 9 and an edge 11 of the body panel 5, thereby forming a square cylindrical body 12 of the paper container.

At the upper ends of the body plates 6 and 8, a pair of gable roof forming plates 15 and 16 are provided through top transverse fold lines 17 and 18, and have outer top sealing plates 13 and 14 on the upper part and face each other. At the upper ends of the body plates 5 and 7, a pair of side wall forming plates 22 and 23 are provided through top transverse fold lines 24 and 25, and have inner top sealing plates 19 and 20 on the upper part and face each other, and either side of the side wall forming plates 22 and 23 can be opened to form a pouring port 21. In the first example, the side wall forming plate 23 is used as the side wall forming plate on the opening side.

The gable roof forming plates 15 and 16 are provided with guide folding lines 26 and 27 for guiding the folding of the gable roof forming plates 15 and 16 when opening the gable roof forming plates 15 and 16 on the side wall forming plates 23 on the opening side. The gable roof forming plate 15 is provided with a straw pouring port 30, which is composed of a first half cut 29 formed from the back side to serve as a straw insertion port and a second half cut 28 formed from the front side to surround the first half cut 29.

The side wall forming plates 22 and 23 are provided with folding lines 31, 32, 33 and 34 for folding the side wall forming plates 22 and 23. Also, substantially triangular face portions 35 and 36 are provided which are surrounded by the folding lines 31, 32, 33 and 34 and the top transverse folding lines 24 and 25.

When forming the paper container, the pair of side wall forming plates 22 and 23 are folded between the pair of gable roof forming plates 15 and 16, and the outer top layer sealing plates 13 and 14 and the inner top layer sealing plates 19 and 20 are heat-sealed at predetermined positions, so that the gable roof-shaped top portion 37 is formed on the paper container as shown in Fig. 7. The gable roof-shaped top portion 37 formed has an opening between the pair of gable roof forming plates 15 and 16, the body plate 7 on the opening side, and the side wall forming plate 23 on the opening side, and a space 38 for inserting fingers so as to place the fingers against the side wall forming plate 23 on the opening side when the paper container is opened. The substantially triangular surface portion 36 formed on the side wall forming plate 23 is located at the deep side of the space 38 .

Furthermore, in the paperboard material 1, on the trunk longitudinal fold lines 3 and 4 on both sides of the trunk plate 7 on the opening side which is connected to the side wall forming plate 23 on the opening side through the top transverse fold line 25, there is set a reference point 40 which is more than 3 mm away from the intersection 39 of the end of the trunk longitudinal fold lines 3 and 4 and the end of the top transverse fold line 25 with a length L1.

The body plate 7 is formed with a first auxiliary fold line 43 having ends 41 and 42 arranged on the body longitudinal fold lines 3 and 4 and curved downward. The ends 41 and 42 of the first auxiliary fold line 43 are arranged so as to connect the reference points 40 to each other, or so as to connect positions near the reference points 40 and below the reference points 40 in the height direction on the body longitudinal fold lines 3 and 4, and the ends 41 and 42 of the first auxiliary fold line 43 are at least 3 mm away from the intersection 39 and within a range of a length L2 that is less than 20% of the length of the top transverse fold line 25.

If the length L1 is less than 3 mm, when the top 37 of the gable roof shape of the paper container described later is formed, when the pressure of the mountain fold from the top transverse fold line 25 is applied, the bending load bearing portion 44 will be bent with a small force, and there will be a defective product with a distorted shape caused by mountain folding from the first auxiliary fold line 43. In addition, if the length L2 exceeds 20% of the length of the top transverse fold line 25, when the paper container is opened, the bending load bearing portion 44 will not be easily bent, and a large force may be required as if it is laborious.

The length L1 from the reference point 40 to the intersection 39 only needs to be 3 mm or more, but the length L1 is preferably 3 to 4 mm. In addition, the length from the ends 41 and 42 of the first auxiliary fold line 43 to the intersection 39 only needs to be 3 mm or more, and the length L2 that is less than 20% of the length of the top transverse fold line 25 can be, but the length L2 is preferably 5 to 6 mm. In this way, the bending load-bearing portion 44 between the top transverse fold line 25 of the body plate 7 and the end portions 41 and 42 of the first auxiliary fold line 43 will not be easily bent with a small force, and when the mountain-shaped roof-shaped top 37 of the paper container is formed, when the mountain-folding pressure is applied from the top transverse fold line 25, it can be more effectively prevented that the force is transmitted to the first auxiliary fold line 43, and the shape of the defective product is distorted due to the mountain fold from the first auxiliary fold line 43. Furthermore, when the paper container is opened, it does not require a large force to be bent, and the paper container can be easily opened.

In the first example, the first auxiliary fold line 43 with downward curved ends 41 and 42 is formed on the body plate 7 in such a manner as to connect the reference points 40 to each other. Therefore, in the first example, the length L1 and the length L2 are the same length. FIG. 2 shows another example in which the ends 41 and 42 of the first auxiliary fold line 43 arranged on the body longitudinal fold lines 3 and 4 on the body plate 7 are arranged in such a manner that the positions near the reference point 40 and below the reference point 40 in the height direction on the body longitudinal fold lines 3 and 4 are connected to each other.

The first auxiliary fold line 43 is used to make the body plate 7 mountain-folded from the first auxiliary fold line 43 when the top corner 54 of the tubular body 12 is pushed into the inside of the paper container when the paper container is opened as described later. By mountain-folding the body plate 7 from the first auxiliary fold line 43, the bending load bearing portion 44 between the top transverse fold line 25 of the body plate 7 and the ends 41, 42 of the first auxiliary fold line 43 is compressed and bent, so that the upper end 45 of the body plate 7 is recessed, and the top corner 54 of the tubular body 12 is bent toward the inside of the paper container.

Furthermore, the downward curved line shape of the first auxiliary fold line 43 may be an arc shape or an angular arc shape. In the first example, the arc shape is formed by a continuous line, but for example, it may be an angular arc shape bent into a V shape as shown in FIG. 3, or an angular arc shape formed by a polygon as shown in FIG. 4, and it may be a discontinuous line that is cut off as shown in FIG. 5 and FIG. 6.

Furthermore, in the first example, since the shape of the first auxiliary fold line 43 is formed in such a way that the lowest point 46 of the downward curve is located at the center of the body plate 7 in the left-right direction, the top corner 54 of the cylindrical body 12 can be easily pressed into the inner side of the paper container from its center.

In the first example, the first auxiliary fold line 43 is formed to be symmetrical. Thus, the space 38 can be expanded symmetrically, and the shape of the space 38 can be made to be easier to insert a finger.

Furthermore, in the first example, bottom-forming plates 47 and 48 are connected to the lower ends of the body plates 5 and 7, and inner side plates 49 and 50 are connected to the lower ends of the body plates 6 and 8. The inner side plates 49 and 50 are folded into the inner sides of the bottom-forming plates 47 and 48, and the contact surfaces thereof are adhered to each other, and the bottom of the cylindrical body 12 is sealed to form the bottom 51 of the paper container. In addition, the structure of the bottom 51 is not limited to the structure of the first example, and other well-known bottom structures in the field of paper containers can be adopted as long as the bottom of the cylindrical body 12 can be sealed.

Furthermore, in the first example, as shown in FIG. 1 , the upper edge of the inner top sealing plate 20 connected to the upper portion of the side wall forming plate 23 provided on the side of the pouring outlet 21 that can be opened is formed into a straight line.

In addition, a first easy-to-peel-off area 52 is provided on the inner surface of the inner top sealing plate 20, and a second easy-to-peel-off area 53 overlapping with the first easy-to-peel-off area 52 is provided on the inner surface of the outer top sealing plates 13 and 14 located on both sides thereof and connected to the upper part of a pair of gable roof forming plates 15 and 16, which is approximately half of the transverse length direction and close to the inner top sealing plate 20.

The position and range of the first easy-to-peel area 52 and the second easy-to-peel area 53 on the inner surface of the inner top sealing plate 20 and the inner surface of the outer top sealing plates 13, 14 are not particularly limited as long as the sealing property that does not cause leakage can be maintained.

In this example, the first easy-to-peel zone 52 is provided at both ends of the inner top sealing plate 20 in the transverse direction of the inner top sealing plate 20, leaving end sealing areas of a predetermined transverse width, and the second easy-to-peel zone 53 is provided at both ends of the inner top sealing plate 20, leaving end sealing areas of a predetermined transverse width, and the first easy-to-peel zone 52 and the second easy-to-peel zone 53 are respectively provided with extension portions 52a and 53a inclined in a manner that the sides of the body plates 6, 7, and 8 become longer from top to bottom at both ends of the first easy-to-peel zone 52 and at the end of the second easy-to-peel zone 53 close to the inner top sealing plate 20.

Furthermore, the transverse width of the body plates 5, 6, 7, 8, which is one of the main factors determining the size of the paper container, or the square meter weight of the paperboard material forming the paper container is not particularly limited. However, in the first example, the transverse width of the body plates 5, 6, 7, 8 is less than 57 mm, and the square meter weight of the paperboard material is 150-250 g/ ^m2 .

The unsealing of such a paper container is performed as follows. First, the top corner 54 formed by bending the top transverse fold line 25 is pressed toward the inside of the paper container. As a result, as the top corner 54 is pressed into the inside of the paper container, its inner corner is opened, and the upper end 45 of the body plate 7 is deformed in a manner that it protrudes from the top corner 54 toward the outside of the paper container as it moves downward. Next, when a force greater than a certain value is applied, the first auxiliary fold line 43 will bend to form a protrusion 55 protruding outward, and a bending load-bearing portion 44 in the upper end portion 45 will generate: a fold line-shaped compression bend 56 (shown by a dot link in Figures 8 and 9) connecting the ends 41, 42 of the first auxiliary fold line 43 or their vicinity to the intersection 39.

Next, the top corner 54 is bent toward the inside of the paper container, and the upper end 45 of the body plate 7 and the roughly triangular surface 36 forming the deep surface of the space 38 are recessed toward the inside of the paper container. As a result, the bottom edge of the opening of the space 38 is expanded to the position of the first auxiliary fold line 43, and the volume of the space 38 is also expanded by the recessed portion of the upper end 45 and the roughly triangular surface 36, so that a space 38 that can easily fit fingers is formed when opening. In addition, the shape or location of the bending 56 occurring in the upper end 45 of the body plate 7 is not fixed, and is not limited to the positions shown in Figures 8 and 9.

Next, the finger is placed in the expanded space 38, and the finger is placed against the side wall forming plate 23 on the unsealed side, and the side wall forming plate 23 and the pair of gable roof forming plates 15, 16 are spread to the left and right, and the facing surfaces of the outer top layer sealing plates 13, 14 and the inner top layer sealing plate 20 are peeled off from each other. Then, the side wall forming plate 23 folded between the pair of gable roof forming plates 15, 16 is pulled out, and the pouring port 21 is opened to unseal the paper container.

According to the paper container of the first example constructed as described above, in the trunk plate 7 on the opening side of the side wall forming plate 23 connected to the opening side through the top transverse fold line 25, a reference point 40 is set on the trunk longitudinal fold lines 3, 4, which is more than 3 mm away from the intersection 39 of the end of the trunk longitudinal fold lines 3, 4 and the end of the top transverse fold line 25, and a first auxiliary fold line 43 with downward curved ends 41, 42 arranged on the trunk longitudinal fold lines 3, 4 is formed, and the ends 41, 42 of the first auxiliary fold line 43 are arranged in a manner that the reference points 40 are connected to each other, or in a manner that the reference points 40 are connected to each other near the reference point 40 and on the trunk longitudinal fold lines 3, 4. The paper container is configured such that the positions below the reference point 40 in the height direction are connected to each other, and the ends 41 and 42 of the first auxiliary fold line 43 are more than 3 mm away from the intersection 39 and within the range of the length L2 which is less than 20% of the length of the top transverse fold line 25. Therefore, when the top 37 of the paper container is formed, when the pressure of the mountain fold from the top transverse fold line 25 is applied, the bending load bearing portion 44 between the top transverse fold line 25 and the ends 41 and 42 of the first auxiliary fold line 43 is prevented from being bent with a small force, and on the other hand, a situation in which a large force such as labor is required to bend it can be prevented. Thus, when the mountain-shaped roof-shaped top 37 of the paper container is formed, since the pressure for mountain folding from the top transverse fold line 25 is applied, there will be no situation where the bending load-bearing part 44 between the top transverse fold line 25 and the end parts 41 and 42 of the first auxiliary fold line 43 will be compressed and bent with a very small force. Therefore, the situation of defective products with distorted shapes due to mountain folding from the first auxiliary fold line 43 can be effectively prevented.

Furthermore, when the paper container is opened, the bending load bearing portion 44 between the top transverse fold line 25 and the ends 41 and 42 of the first auxiliary fold line 43 is bent without much force, so that the top corner 54 of the cylindrical body 12 can be easily pressed in, and the upper end 45 of the body plate 7 can be recessed. Then, by the recessing of the upper end 45 of the body plate 7, the top corner 54 is bent toward the inside of the container, and when the fingers are placed against the side wall forming plate during opening, the space for inserting the fingers becomes wider, so that the paper container can be easily opened.

Furthermore, by compressing the bending load-bearing portion 44 between the top transverse fold line 25 of the body plate 7 and the ends 41 and 42 of the first auxiliary fold line 43, the deformed portion becomes a damper and can maintain the upper end 45 of the body plate 7 in a concave state, thereby making it easy to open the paper container.

Furthermore, since the downwardly curved first auxiliary fold line 43 is in the shape of an arc, a V-shape, a polygon or a combination thereof, when the paper container is opened, when the top corner 54 or the vicinity of the top corner 54 of the tubular body 12 formed by bending the top horizontal fold line 25 is pressed, the upper end portion 45 of the body plate 7 can be easily mountain folded from the first auxiliary fold line 43, and the upper end portion 45 of the body plate 7 can be easily recessed.

Furthermore, since the lowest point 46 of the curve of the first auxiliary fold line 43 is located at the center of the body plate 7 in the left-right direction, the top corner 54 of the cylindrical body 12 can be easily pressed into the inner side of the paper container from its center.

Furthermore, since the first auxiliary fold line 43 is formed symmetrically, the shape of the space 38 expanded by recessing the upper end portion 45 of the body plate 7 becomes symmetrical, and the shape of the space 38 can be formed into a shape that is easy for fingers to enter.

Furthermore, since the upper edge of the inner top sealing plate 20 is in a straight line shape, the sealing area between the inner top sealing plate 20 and the outer top sealing plates 13, 14 located on both sides of the inner top sealing plate 20 is very small, and the inner top sealing plate 20 and the outer top sealing plates 13, 14 can be easily peeled off.

Furthermore, since a first easy-to-peel-off area 52 is provided on the inner surface of the inner top sealing plate 20, and a second easy-to-peel-off area 53 overlapping with the first easy-to-peel-off area 52 is provided on approximately half of the inner surface of the outer top sealing plates 13, 14 located on both sides thereof in the transverse length direction and close to the inner top sealing plate 20, the inner top sealing plate 20 can be easily peeled off from the outer top sealing plates 13, 14.

In this example, the first easily peelable area 52 is provided at both ends of the inner top sealing plate 20 in the transverse length direction, leaving end sealing areas of a predetermined transverse width, and the second easily peelable area 53 is provided at the inner top sealing plate 20, leaving end sealing areas of a predetermined transverse width. Next, since the first easy-to-peel zone 52 and the second easy-to-peel zone 53 are located at both ends of the first easy-to-peel zone 52 and the end of the second easy-to-peel zone 53 close to the inner top layer sealing plate 20, they respectively have extension portions 52a and 53a that are inclined in a manner that the sides of the body plates 6, 7, and 8 become longer from top to bottom, the inclination direction of the upper sides of the extension portions 52a and 53a of the first easy-to-peel zone 52 and the second easy-to-peel zone 53 will be along the peeling direction of the end sealing areas of the inner top layer sealing plate 20 and the outer top layer sealing plates 13 and 14 when the side wall forming plates 22 and 23 are pulled out. Thereby, the end sealing areas of the inner top sealing plate 20 and the outer top sealing plates 13, 14 can be easily peeled off, and the unsealing of the paper container becomes easy.

Furthermore, since a straw spout 30 is provided on the gable roof forming plate 15, the straw spout 30 is composed of a first half cut 29 formed from the back side to serve as a straw insertion port and a second half cut 28 formed from the front side to surround the first half cut 29. Therefore, in addition to the formation of the spout 21, liquid contents contained in the paper container can also be taken out by a straw.

Figures 10 to 12 show the second example of the implementation form of the paper container of the present invention. Figure 10 is a plan view of the paperboard material of the paper container of the second example. Figure 11 is an enlarged side view showing the state of the first auxiliary folding line of the paper container formed by the paperboard material shown in Figure 10 being bent. Figure 12 is a three-dimensional view of the paper container shown in Figure 11.

The paper container of the second example has no change in basic structure from the paper container of the first example, and the same symbols are given to the same structures as the first example. The paper container of the second example is different from the first example in the positions of the ends 41 and 42 of the first auxiliary fold line 43. As shown in FIG. 10, the first auxiliary fold line 43 of the second example is configured so that the ends 41 and 42 are connected to each other near the reference point 40 and away from the longitudinal fold lines 3 and 4 of the body and below the reference point 40 in the height direction.

The reference point 40 is, as in the first example, a length L1 of more than 3 mm away from the intersection 39, and the ends 41 and 42 of the first auxiliary fold line 43 are, as in the first example, more than 3 mm away from the intersection 39 and within a range of a length L2 of less than 20% of the length of the top transverse fold line 25. If the length L1 is less than 3 mm, as in the first example, when the top 37 of the gable roof shape of the paper container is formed, when the pressure of the mountain fold from the top transverse fold line 25 is applied, the load-bearing portion 44 will be bent with a small force, and there will be a defective product with a distorted shape caused by the mountain fold from the first auxiliary fold line 43. Furthermore, if the length L2 exceeds 20% of the length of the top transverse fold line 25, when the paper container is opened, the bending load bearing portion 44 will not be easily bent, but will require a lot of force as if with labor.

The length L1 from the reference point 40 to the intersection 39 is 3 mm or more as in the first example, but the length L1 is preferably 3 to 4 mm. In addition, the length from the ends 41 and 42 of the first auxiliary fold line 43 to the intersection 39 is 3 mm or more, and the length L2 is less than 20% of the length of the top transverse fold line 25, but the length L2 is preferably 5 to 6 mm. Thus, as in the first example, the bending load bearing portion 44 between the top transverse fold line 25 of the body plate 7 and the ends 41 and 42 of the first auxiliary fold line 43 will not be easily bent with a small force, and when the top 37 of the gable roof shape of the paper container is formed, when the pressure of the top transverse fold line 25 is applied to the mountain fold, it is more effectively prevented that the force is transmitted to the first auxiliary fold line 43, and the first auxiliary fold line 43 is mountain-folded to cause the shape of the defective product to be distorted, and when the paper container is opened, it does not need a large force to be bent, and the paper container can be easily opened. The other structures are the same as in the first example, so the first example is cited and its description is omitted.

The opening of the paper container of the second example is similar to the first example. First, the top corner 54 of the cylindrical body 12 formed by bending the top transverse fold line 25 is pressed toward the inside of the paper container. As a result, the top corner 54 is pressed into the inside of the paper container, and the inner corner is opened, and the upper end 45 of the body plate 7 is deformed in a manner of protruding from the top corner 54 toward the outside of the paper container as it moves downward. Next, when a certain force is applied, the first auxiliary fold line 43 will bend to form a protrusion 55 protruding outward, and a fold line-shaped pressure bend 56 (shown by a dot chain in Figures 11 and 12) will be generated, connecting the ends 41, 42 of the first auxiliary fold line 43 or their vicinity to the intersection 39. Next, the top corner 54 is bent toward the inside of the paper container, and the upper end 45 of the body plate 7 and the roughly triangular surface 36 of the deep surface forming the space 38 will be recessed toward the inside of the paper container. In this way, the space 38 is the part where the upper end 45 and the roughly triangular surface 36 are recessed, and a space 38 is formed in which fingers can be easily inserted when opening. The rest of the unsealing procedures are the same as those in Example 1, so Example 1 is used and its description is omitted.

According to the paper container of the second example constructed as described above, in the trunk plate 7 on the opening side of the side wall forming plate 23 connected to the opening side through the top transverse fold line 25, a reference point 40 is set on the trunk longitudinal fold lines 3, 4, which is more than 3 mm away from the intersection 39 of the end of the trunk longitudinal fold lines 3, 4 and the end of the top transverse fold line 25, and a first auxiliary fold line 43 with downward curved ends 41, 42 is arranged on the trunk longitudinal fold lines 3, 4, and the ends 41, 42 of the first auxiliary fold line 43 are located near the reference point 40 and at a position away from the trunk longitudinal fold lines 3, 4 and at a height direction of the reference point 40. The ends 41 and 42 are arranged in a manner that they are connected to each other at the positions below, and the ends 41 and 42 of the first auxiliary fold line 43 are more than 3 mm away from the intersection 39 and within the range of the length L2 that is less than 20% of the length of the top transverse fold line 25. Therefore, when the mountain-shaped roof-shaped top 37 of the paper container is formed, when the mountain-folding pressure from the top transverse fold line 25 is applied, the bending load bearing portion 44 between the top transverse fold line 25 and the ends 41 and 42 of the first auxiliary fold line 43 can be prevented from being bent with a small force, and on the other hand, a situation in which a large force such as labor is required to bend it can be prevented. Thus, as in the first example, when the mountain-shaped roof-shaped top 37 of the paper container is formed, since the pressure for mountain folding from the top transverse fold line 25 is applied, there will be no situation where the bending load-bearing portion 44 between the top transverse fold line 25 and the ends 41, 42 of the first auxiliary fold line 43 will be compressed and bent with a very small force. Therefore, the situation of defective products with distorted shapes due to mountain folding from the first auxiliary fold line 43 can be effectively prevented.

Furthermore, when the paper container is opened, the bending load bearing portion 44 between the top transverse fold line 25 and the ends 41 and 42 of the first auxiliary fold line 43 is pressed and bent without much force, so the top corner 54 of the cylindrical body 12 can be easily pressed in, and the upper end 45 of the body plate 7 can be recessed. Then, by the recessing of the upper end 45 of the body plate 7, the top corner 54 is bent toward the inside of the container, and when the fingers are placed against the side wall forming plate during opening, the space for inserting the fingers becomes wider, and the paper container can be easily opened. The other effects are the same as those in the first example, so the first example is cited and its description is omitted.

Figures 13 to 17 show the third example of the implementation form of the paper container of the present invention, Figure 13 is a plan view of the paperboard material of the paper container of the third example, Figure 14 is an illustrative view of other examples of the shape of the second auxiliary folding line shown in Figure 13, Figure 15 is a side view of the paper container formed by the paperboard material shown in Figure 13, Figure 16 is an enlarged illustrative view of the side of the paper container shown in Figure 15 in which the first auxiliary folding line and the second auxiliary folding line are bent and the body is concave, and Figure 17 is a three-dimensional view of the paper container shown in Figure 16.

The paper container of the third example has no change in basic structure from the paper container of the first example, and the same symbols are given to the same structures as the first example. The paper container of the third example is different from the first example in that the roughly triangular surface 36 provided by the body plate 7 on the opening side and the side wall forming plate 23 on the opening side is formed with a second auxiliary fold line 58 extending from the lowest point 46 of the center of the first auxiliary fold line 43, across the top transverse fold line 25, and extending to the vertex 57 of the roughly triangular surface 36.

The shape of the second auxiliary fold line 58 is not particularly limited, but it is ideal that the lower side end 59 on the side of the center position direction of the top transverse fold line 25 of the second auxiliary fold line 58 is located at the center position of the top transverse fold line 25 or near the center position, and the upper side end 60 on the side of the vertex 57 of the roughly triangular surface 36 is located at the vertex 57 of the roughly triangular surface 36 or near the vertex 57.

In the third example, the second auxiliary fold line 58 has a lower side end 59 located at the center of the top transverse fold line 25, and an upper side end 60 located at the vertex 57 of the substantially triangular face portion 36. FIG. 14 shows another example of the second auxiliary fold line 58, and the second auxiliary fold line 58 shown in FIG. 14 has a lower side end 59 located near the center of the top transverse fold line 25, and an upper side end 60 located near the vertex 57 of the substantially triangular face portion 36.

Furthermore, although not shown in the figure, the lower side end 59 of the second auxiliary fold line 58 can be located at the center of the top transverse fold line 25, and the upper side end 60 can be located near the vertex 57 of the roughly triangular surface portion 36. Furthermore, the lower side end 59 of the second auxiliary fold line 58 can be located near the center position of the top transverse fold line 25, and the upper side end 60 on the vertex 57 of the roughly triangular surface portion 36 can be located at the vertex 57 of the roughly triangular surface portion 36.

Furthermore, in the third example, the second auxiliary fold line 58 is a straight line, but it may be a wavy line or a dotted line.

In the third example, when the paper container is opened, as a mark when the top corner 54 of the cylindrical body 12 is pressed into the inside of the paper container, a mark display portion 64 indicating the pressing mark is provided across the substantially triangular surface portion 36 and the body plate 7, or on either the substantially triangular surface portion 36 or the body plate 7, at the center of the top transverse fold line 25 or in the vicinity thereof. In FIG. 13, the mark display portion 64 is provided across the substantially triangular surface portion 36 and the body plate 7, and is provided in the center of the top transverse fold line 25. In FIG. 14, it is provided in the vicinity of the top transverse fold line 25 of the body plate 7. In the third example, although the punctuation mark display portion 64 is formed by embossing, it is not limited to this as long as the punctuation mark display portion 64 can be identified. For example, it can also be printed. The shape of the punctuation mark display portion 64 is not particularly limited. For example, by patterning, the effect of a new style of paper container can be exerted. The other structures are the same as those in the first example, so the first example is cited and its description is omitted.

The paper container of the third example is opened in the same manner as the first example. First, the top corner 54 of the cylindrical body 12 formed by folding the top transverse fold line 25 is pressed toward the inside of the paper container. As a result, as the top corner 54 is pressed into the inside of the paper container, the inner corner is opened, and the upper end 45 of the body plate 7 is deformed so as to protrude from the top corner 54 toward the outside of the paper container as it moves downward.

At this time, since a second auxiliary fold line 58 is formed on the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36, which extends from the lowest point 46 of the center portion of the first auxiliary fold line 43, across the top horizontal fold line 25, and to the direction of the top point 57 of the roughly triangular surface portion 36, by pressing in the top corner 54, the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36 are induced to valley fold from the second auxiliary fold line 58 and the center portion of the top corner 54 is bent toward the inner side of the paper container.

When a force above a certain level is applied, the first auxiliary fold line 43 will bend to form a protrusion 55 protruding outward, and a fold line-shaped bend 56 will be generated connecting the end portions 41, 42 of the first auxiliary fold line 43 or their vicinity to the intersection 39 (shown by a dot link in Figures 16 and 17).

Next, the top corner 54 is bent toward the inside of the paper container with the center as the center, and the upper end 45 of the body plate 7 and the roughly triangular surface 36 of the deep surface forming the space 38 are recessed toward the inside of the paper container. In this way, the space 38 is the part where the upper end 45 and the roughly triangular surface 36 are recessed, and a space 38 is formed in which fingers can be easily inserted when opening. The other unsealing procedures are the same as those in the first example, so the first example is cited and its description is omitted.

According to the paper container of the third example, since a second auxiliary fold line 58 is formed on the body plate 7 and the roughly triangular surface portion 36, which extends from the lowest point 46 of the center portion of the first auxiliary fold line 43, across the top horizontal fold line 25, and to the direction of the top point 57 of the roughly triangular surface portion 36, when the top corner portion 54 is pressed, the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36 are induced to valley fold from the second auxiliary fold line 58 and the center portion of the top corner portion 54 is bent toward the inside of the paper container, and the roughly triangular surface portion 36 and the upper end portion 45 of the body plate 7 can be easily recessed.

In particular, if the lower side end portion 59 on the side of the second auxiliary fold line 58 in the direction of the lowermost point 46 of the first auxiliary fold line 43 is located at the lowermost point 46 of the first auxiliary fold line 43 or near the lowermost point 46, and the upper side end portion 60 on the side of the vertex 57 of the roughly triangular surface portion 36 is located at the vertex 57 of the roughly triangular surface portion 36 or near the vertex 57, when the top corner 54 is pressed in, it will become easy for the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36 to valley fold from the second auxiliary fold line 58, thereby effectively inducing the central portion of the top corner portion 54 to bend toward the inner side of the paper container, and the roughly triangular surface portion 36 and the upper end portion 45 of the body plate 7 can be more easily recessed.

Furthermore, since a punctuation mark display portion 64 indicating a pressed punctuation mark is provided at or near the center of the top horizontal fold line 25 across the roughly triangular face portion 36 and the body plate 7, or on either of the roughly triangular face portion 36 and the body plate 7, when the paper container is opened, the center of or near the top corner portion 54 of the cylindrical body 12 can be surely pressed in by the punctuation mark display portion 64. Furthermore, if the punctuation mark display portion 64 is formed by embossing, even if the punctuation mark display portion 64 is difficult to see, the punctuation mark display portion 64 can be easily confirmed by touch. Furthermore, since the embossing is recognized by vision, the effect of a new style of the paper container can be brought into play by patterning the shape of the punctuation mark display portion 64. The other effects are the same as those in the first example, so the first example is cited and its description is omitted.

Figures 18 to 25 show the fourth example of the implementation form of the paper container of the present invention, Figure 18 is a plan view of the paperboard material of the paper container of the fourth example, Figures 19, 20, 21, 22 and 23 are explanatory views of other examples of the shape of the second auxiliary folding line shown in Figure 18, respectively, Figure 24 is an enlarged explanatory view of the side view of the first auxiliary folding line and the second auxiliary folding line of the paper container formed by the paperboard material shown in Figure 18 being folded, and Figure 25 is a three-dimensional view of the paper container shown in Figure 24.

The paper container of the fourth example has no change in basic structure from the paper container of the third example, and the same symbols are given to the same structure as the third example. The paper container of the fourth example is different from the third example in that the roughly triangular surface 36 provided by the body plate 7 on the opening side and the side wall forming plate 23 on the opening side is formed with a second auxiliary fold line 61 extending from the lowest point 46 of the center of the first auxiliary fold line 43, across the top transverse fold line 25, and extending to the vertex 57 of the roughly triangular surface 36.

The shape of the second auxiliary fold line 61 is not particularly limited, but it is ideal that the lower side end portion 62 of the second auxiliary fold line 61 in the direction of the lowest point 46 of the first auxiliary fold line 43 is located at or near the lowest point 46 of the first auxiliary fold line 43, and the upper side end portion 63 on the side of the vertex 57 of the roughly triangular face portion 36 is located at or near the vertex 57 of the roughly triangular face portion 36.

In the fourth example, the lower side end 62 of the second auxiliary fold line 61 is located at the lowest point 46 of the first auxiliary fold line 43, and the upper side end 63 is located at the vertex 57 of the roughly triangular face portion 36. Also, although not shown, it is also possible to make the lower side end 62 of the second auxiliary fold line 61 located at the lowest point 46 of the first auxiliary fold line 43, and the upper side end 63 located near the vertex 57 of the roughly triangular face portion 36. It is also possible to make the lower side end 62 of the second auxiliary fold line 61 located near the lowest point 46 of the first auxiliary fold line 43, and the upper side end 63 located at the vertex 57 of the roughly triangular face portion 36.

Fig. 19, Fig. 20, Fig. 21, Fig. 22, and Fig. 23 respectively show other examples of the shape of the second auxiliary fold line 61. The second auxiliary fold line 61 shown in Fig. 19 has a lower end portion 62 located near the lowest point 46 of the first auxiliary fold line 43, and an upper end portion 63 located near the vertex 57 of the substantially triangular face portion 36. The second auxiliary fold line 61 shown in Fig. 20 has a lower end portion 62 of the second auxiliary fold line 61 shown in Fig. 19 formed in an arrow symbol shape. The second auxiliary fold line 61 shown in Fig. 21 forms a wavy line shape. The second auxiliary fold line 61 shown in Fig. 22 forms two lines. The second auxiliary fold line 61 shown in Fig. 23 forms a shape in which a plurality of circles are arranged in a straight line shape.

In addition, the second auxiliary fold line 61 crossing the top transverse fold line 25 does not necessarily mean that an intersection is formed between the second auxiliary fold line 61 and the top transverse fold line 25, but also includes that the second auxiliary fold line 61 is cut off at the top transverse fold line 25 and is not connected to the top transverse fold line 25. The other structures are the same as those in the third example, so the third example is cited and its description is omitted.

The paper container of the fourth example is opened in the same manner as the third example. First, the top corner 54 of the cylindrical body 12 formed by folding the top transverse fold line 25 is pressed toward the inside of the paper container. As a result, as the top corner 54 is pressed into the inside of the paper container, the inner corner is opened, and the upper end 45 of the body plate 7 is deformed so as to protrude from the top corner 54 toward the outside of the paper container as it moves downward.

At this time, since a second auxiliary fold line 61 is formed on the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36, which extends from the lowest point 46 of the center portion of the first auxiliary fold line 43, across the top horizontal fold line 25, and to the direction of the top point 57 of the roughly triangular surface portion 36, by pressing in the top corner 54, the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36 are induced to valley fold from the second auxiliary fold line 61 and the center portion of the top corner 54 is bent toward the inner side of the paper container.

When a force above a certain level is applied, the first auxiliary fold line 43 will bend to form a protrusion 55 protruding outward, and a fold line-shaped bend 56 will be generated connecting the end portions 41, 42 of the first auxiliary fold line 43 or their vicinity to the intersection 39 (shown by a dot link in Figures 24 and 25).

Next, the top corner 54 is bent toward the inside of the paper container with the center as the center, and the upper end 45 of the body plate 7 and the roughly triangular surface 36 of the deep surface forming the space 38 are recessed toward the inside of the paper container. In this way, the space 38 is the part where the upper end 45 and the roughly triangular surface 36 are recessed, and a space 38 is formed in which fingers can be easily inserted when opening. The other opening methods are the same as those in the third example, so the third example is cited and its description is omitted.

According to the paper container of the fourth example constructed as described above, a second auxiliary fold line 61 is formed on the body plate 7 and the roughly triangular surface portion 36, which extends from the lowest point 46 of the center portion of the first auxiliary fold line 43, across the top horizontal fold line 25, and to the direction of the top point 57 of the roughly triangular surface portion 36. Therefore, when the top corner 54 is pressed, the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36 are induced to valley fold from the second auxiliary fold line 61, and the center portion of the top corner 54 is bent toward the inside of the paper container, and the roughly triangular surface portion 36 and the upper end portion 45 of the body plate 7 can be easily recessed.

In particular, since the lower side end portion 62 on the side of the second auxiliary fold line 61 in the direction of the lowermost point 46 of the first auxiliary fold line 43 is located at the lowermost point 46 of the first auxiliary fold line 43 or near the lowermost point 46, and the upper side end portion 63 on the side of the vertex 57 of the roughly triangular surface portion 36 is located at the vertex 57 of the roughly triangular surface portion 36 or near the vertex 57, when the top corner 54 is pressed, it becomes easy for the upper end portion 45 of the body plate 7 and the roughly triangular surface portion 36 to valley fold from the second auxiliary fold line 61, thereby effectively inducing the central portion of the top corner 54 to bend toward the inner side of the paper container, and the roughly triangular surface portion 36 and the upper end portion 45 of the body plate 7 can be more easily recessed.

Figures 26 to 28 show the fifth example of the implementation form of the paper container of the present invention. Figure 26 is a plan view showing the paperboard material of the paper container of the fifth example. Figure 27 is an enlarged side view showing the state of the first auxiliary folding line and the second auxiliary folding line of the paper container formed by the paperboard material shown in Figure 26 being folded. Figure 28 is a three-dimensional view of the paper container shown in Figure 27.

The paper container of the fifth example has no change in basic structure from the paper container of the third example, and the same symbols are given to the same structures as the third example. The paper container of the fifth example is different from the third example in the positions of the ends 41 and 42 of the first auxiliary fold line 43. As shown in FIG. 26, the first auxiliary fold line 43 of the fifth example is the same as the second example, and the ends 41 and 42 are arranged in a manner that connects the positions near the reference point 40 and away from the longitudinal fold lines 3 and 4 of the body and below the reference point 40 in the height direction.

The ends 41 and 42 of the first auxiliary fold line 43 are preferably more than 3 mm away from the intersection 39 and within the range of the length L2 which is less than 20% of the length of the top transverse fold line 25. If the length L2 is less than 3 mm, when the top 37 of the mountain-shaped roof of the paper container is formed, when the pressure of the mountain fold from the top transverse fold line 25 is applied, the load-bearing portion 44 will be bent with a small force, and there will be a defective product with a distorted shape due to the mountain fold from the first auxiliary fold line 43. The other structures are the same as those in the third example, so the third example is cited and its description is omitted.

The paper container of the fifth example is opened in the same manner as the third example. First, the top corner 54 of the cylindrical body 12 formed by folding the top transverse fold line 25 is pressed toward the inside of the paper container. As a result, the top corner 54 is pressed into the inside of the paper container, and the inner corner is opened, and the upper end 45 of the body plate 7 is deformed so as to protrude from the top corner 54 toward the outside of the paper container as it moves downward.

Next, when a force greater than a certain value is applied, the first auxiliary fold line 43 will be folded to become a protrusion 55 protruding outward, and a fold line-shaped press bend 56 (shown by a dot link in Figures 27 and 28) will be generated at the upper end 45 of the body plate 7, connecting the ends 41, 42 of the first auxiliary fold line 43 or their vicinity to the intersection 39.

Next, the top corner 54 is bent toward the inside of the paper container with the center as the center, and the upper end 45 of the body plate 7 and the roughly triangular surface 36 of the deep surface forming the space 38 are recessed toward the inside of the paper container. In this way, the space 38 is the part where the upper end 45 and the roughly triangular surface 36 are recessed, and a space 38 is formed in which fingers can be easily inserted when opening. The other opening methods are the same as those in the third example, so the third example is cited and its description is omitted.

According to the paper container of the fifth example constructed as described above, in the trunk plate 7 on the opening side connected to the side wall forming plate 23 on the opening side through the top transverse fold line 25, the trunk longitudinal fold lines 3, 4 on both sides of the trunk plate 7 on the opening side are provided with: a reference point 40 of a predetermined length away from the intersection 39 of the ends of the trunk longitudinal fold lines 3, 4 and the end of the top transverse fold line 25, and a first auxiliary fold line 43 in the shape of a downward curve is provided, and the ends 41, 42 of the first auxiliary fold line 43 are formed by intersecting the reference point 40 with the end of the trunk longitudinal fold lines 3, 4 and the end of the top transverse fold line 25. The first auxiliary fold line 43 is arranged in a manner of being connected to each other near and at a position away from the longitudinal fold lines 3 and 4 of the body and below the reference point 40 in the height direction, and the end portions 41 and 42 of the first auxiliary fold line 43 are not connected to the top transverse fold line 25. Therefore, when the mountain-shaped roof-type top of the paper container is formed and pressure is applied to cause the top transverse fold line 25 to mountain fold, the force can be prevented from being directly transmitted to the first auxiliary fold line 43, and the situation in which the first auxiliary fold line 43 mountain folds will not occur, and there is no risk of distortion of the shape of the paper container.

Furthermore, when the paper container is opened, the top corner 54 of the tubular body 12 formed by bending the top transverse fold line 25 is pressed in to fold the first auxiliary fold line 43, and a compression bend 56 is generated in the bending load-bearing portion 44 between the top transverse fold line 25 of the body plate 7 and the first auxiliary fold line 43, so that the upper end portion 45 of the body plate 7 is recessed, and the paper container can be easily opened.

Furthermore, by forming a damper by bending the upper end portion 45 of the body plate 7, the deformed portion can maintain the upper end portion 45 in a concave state, and the paper container can be opened more easily. The other effects are the same as those in the third example, so the third example is cited and its description is omitted.

Figures 29 to 31 show the sixth example of the implementation form of the paper container of the present invention, Figure 29 is a plan view showing the paperboard material of the paper container of the sixth example, Figure 30 is an enlarged side view showing the state of the first auxiliary folding line and the second auxiliary folding line of the paper container formed by the paperboard material shown in Figure 29 being folded, and Figure 31 is a three-dimensional view of the paper container shown in Figure 30.

The paper container of the sixth example has no change in basic structure from the paper container of the fifth example, and the same symbols are given to the same structure as the fifth example. The paper container of the sixth example is different from the fifth example in that the roughly triangular surface 36 provided by the body plate 7 on the opening side and the side wall forming plate 23 on the opening side is provided with a second auxiliary fold line 61 extending from the lowest point 46 of the center of the first auxiliary fold line 43, across the top transverse fold line 25, and extending to the vertex 57 of the roughly triangular surface 36.

As the shape of the second auxiliary fold line 61 is the same as the second auxiliary fold line 61 in the paper container of the fifth example, the drawing showing the second auxiliary fold line 61 in the fifth example and its description are referred to and the description thereof is omitted. As the other structures are also the same as the fifth example, the fifth example is referred to and the description thereof is omitted.

The opening of the paper container in the 6th example is the same as that in the 5th example, so the 5th example is cited and its description is omitted.

According to the paper container of the sixth example constructed as described above, similarly to the fifth example, in the body plate 7 on the opening side connected to the side wall forming plate 23 on the opening side through the top transverse fold line 25, the body longitudinal fold lines 3, 4 on both sides of the body plate 7 on the opening side are provided with: a reference point 40 of a predetermined length is separated from the intersection 39 of the end of the body longitudinal fold lines 3, 4 and the end of the top transverse fold line 25, and a first auxiliary fold line 43 in the shape of a downward curve is formed, and the end portions 41, 42 of the first auxiliary fold line 43 are formed by The first auxiliary fold line 43 is arranged in a manner of being connected to each other near the reference point 40 and at a position away from the longitudinal fold lines 3 and 4 of the body and below the reference point 40 in the height direction, and the end portions 41 and 42 of the first auxiliary fold line 43 are not connected to the top transverse fold line 25. Therefore, when the mountain-shaped roof-type top of the paper container is formed, when pressure is applied to cause the top transverse fold line 25 to mountain-fold, the force can be prevented from being directly transmitted to the first auxiliary fold line 43, and the situation of defective products with distorted shapes due to mountain folding of the first auxiliary fold line 43 can be effectively prevented.

Furthermore, when the paper container is opened, the top corner 54 of the tubular body 12 formed by bending the top transverse fold line 25 is pressed in to fold the first auxiliary fold line 43, and a compression bend 56 is generated in the bending load-bearing portion 44 between the top transverse fold line 25 of the body plate 7 and the first auxiliary fold line 43, so that the upper end portion 45 of the body plate 7 is recessed, and the paper container can be easily opened.

Furthermore, by forming a damper by bending the upper end portion 45 of the body plate 7, the deformed portion can maintain the upper end portion 45 in a concave state, and the paper container can be opened more easily. The other effects are the same as those in Example 5, so Example 5 is cited and its description is omitted.

1: Paperboard material 2,3,4: Longitudinal fold line of the body 5,6,7,8: Body board 9: Longitudinal fold line of the body 10: Longitudinal sealing plate 11: Edge 12: Cylindrical body 13,14: External top sealing plate 15,16: Gable roof forming plate 17,18: Top horizontal fold line 19,20: Internal top sealing plate 21: Injection port 22,23: Side wall shape Finished plate 24,25: Top horizontal fold line 26,27: Guide fold line 28: Second half cut 29: First half cut 30: Straw outlet 31,32,33,34: Folding line 35,36: Roughly triangular surface 37: Top 38: Space 39: Intersection point 40: Reference point 41,42: End of the first auxiliary fold line 43: First auxiliary fold Line 44: Bending load bearing part 45: Upper end of the opening side body plate 46: The lowest point of the first auxiliary folding line 47,48: Bottom forming plate 49,50: Inner side plate 51: Bottom 52: First easy peeling area 52a: Extension part 53: Second easy peeling area 53a: Extension part 54: Top corner 55: Protrusion 56: Pressed bend 57: Vertex of roughly triangular face 58: Second auxiliary fold line 59: Lower side end of second auxiliary fold line 60: Upper side end of second auxiliary fold line 61: Second auxiliary fold line 62: Lower side end of second auxiliary fold line 63: Upper side end of second auxiliary fold line 64: Marking display part L1: Length from base point to intersection L2: Length from the end of first auxiliary fold line to intersection

[FIG. 1] is a plan view of a paperboard material showing the first example of the implementation form of the paper container of the present invention. [FIG. 2] is an explanatory diagram showing another example of the end configuration position of the first auxiliary fold line shown in FIG. 1. [FIG. 3] is an explanatory diagram showing another example of the shape of the first auxiliary fold line shown in FIG. 1. [FIG. 4] is an explanatory diagram showing another example of the shape of the first auxiliary fold line shown in FIG. 1. [FIG. 5] is an explanatory diagram showing another example of the shape of the first auxiliary fold line shown in FIG. 1. [FIG. 6] is an explanatory diagram showing another example of the shape of the first auxiliary fold line shown in FIG. 1. [FIG. 7] is a side view showing a paper container formed by the paperboard material shown in FIG. 1. [Figure 8] is an enlarged explanatory diagram showing the state in which the first auxiliary fold line of the paper container shown in Figure 7 is bent and the body is concave. [Figure 9] is a three-dimensional view of the paper container shown in Figure 8. [Figure 10] is a plane view of the paperboard material of the second example of the implementation form of the paper container of the present invention. [Figure 11] is an enlarged explanatory diagram showing the state in which the first auxiliary fold line of the paper container formed by the paperboard material shown in Figure 10 is bent. [Figure 12] is a three-dimensional view of the paper container shown in Figure 11. [Figure 13] is a plane view of the paperboard material of the third example of the implementation form of the paper container of the present invention. [Fig. 14] is an explanatory diagram showing another example of the shape of the second auxiliary fold line shown in Fig. 13. [Fig. 15] is a side view showing a paper container formed by the paperboard material shown in Fig. 13. [Fig. 16] is an enlarged explanatory diagram showing a state in which the first auxiliary fold line and the second auxiliary fold line of the paper container shown in Fig. 15 are bent and the body is concave. [Fig. 17] is a three-dimensional view of the paper container shown in Fig. 16. [Fig. 18] is a plan view of the paperboard material of the fourth example of the implementation form of the paper container of the present invention. [Fig. 19] is an explanatory diagram showing another example of the shape of the second auxiliary fold line shown in Fig. 18. [Fig. 20] is an explanatory diagram showing another example of the shape of the second auxiliary fold line shown in Fig. 18. [Fig. 21] is an explanatory diagram showing another example of the shape of the second auxiliary fold line shown in Fig. 18. [Fig. 22] is an explanatory diagram showing another example of the shape of the second auxiliary fold line shown in Fig. 18. [Fig. 23] is an explanatory diagram showing another example of the shape of the second auxiliary fold line shown in Fig. 18. [Fig. 24] is an explanatory diagram showing an enlarged side view of the state where the first auxiliary fold line and the second auxiliary fold line of the paper container formed by the paperboard material shown in Fig. 18 are bent. [Fig. 25] is a three-dimensional view of the paper container shown in Fig. 24. [Fig. 26] is a plan view of a paperboard material of the fifth example of the implementation form of the paper container of the present invention. [Fig. 27] is an enlarged side view showing a state where the first auxiliary fold line and the second auxiliary fold line of the paper container formed by the paperboard material shown in Fig. 26 are bent. [Fig. 28] is a three-dimensional view of the paper container shown in Fig. 27. [Fig. 29] is a plan view of a paperboard material of the sixth example of the implementation form of the paper container of the present invention. [Fig. 30] is an enlarged side view showing a state where the first auxiliary fold line and the second auxiliary fold line of the paper container formed by the paperboard material shown in Fig. 29 are bent. [Fig. 31] is a three-dimensional view of the paper container shown in Fig. 30.

1: Cardboard material

2,3,4: Trunk longitudinal break line

5,6,7,8: Trunk plate

9: Trunk longitudinal fold line

10: Longitudinal sealing plate

11: edge part

12:Tubular trunk

13,14: External top sealing plate

15,16: Gable roof forming plate

17,18: Top horizontal fold line

19,20: Inner top sealing plate

21: Injection outlet

22,23: Side wall forming plate

24,25: Top horizontal fold line

26,27: Guide line

28: 2nd half cut

29: 1st half cut

30: outlet for straw

31,32,33,34: Polyline for folding in

35,36: roughly triangular face

39: Intersection

40: Baseline point

41,42: The end of the first auxiliary fold line

43: 1st auxiliary broken line

45: Open the upper end of the side body plate

46: The lowest point of the first auxiliary broken line

47,48: Bottom forming plate

49,50: Inner plate

52: The first easy-to-peel-off area

52a: Extension

53: The second easy-to-peel-off area

53a: Extension

L1: Length from the reference point to the intersection point

L2: Length from the end of the first auxiliary broken line to the intersection point

Claims (15)

A paper container is formed of a paperboard material with thermoplastic resin laminated on the front and back sides, and has four body plates, and the edges are connected by longitudinal sealing plates to form a square cylindrical body, and the upper end of the body plate is connected with: a pair of gable roof forming plates having outer top layer sealing plates on the upper part and facing each other, and a A pair of side wall forming plates having an inner top sealing plate and facing each other so that either side can be opened to form a pouring outlet, wherein the pair of side wall forming plates are folded between the pair of gable roof forming plates, and the outer top sealing plate and the inner top sealing plate are heat-sealed at a predetermined position to form a gable roof-shaped paper container at the top, and the characteristics are: In the trunk plate on the opening side connected to the side wall forming plate on the opening side through the top transverse fold line, on the trunk longitudinal fold lines on both sides of the trunk plate on the opening side, there are provided: a first auxiliary fold line formed in a downward curved line at a reference point more than 3 mm away from the intersection of the end of the trunk longitudinal fold line and the end of the top transverse fold line, the end of the first auxiliary fold line is arranged in a manner connecting the reference points to each other, or in a manner connecting positions near the reference point and on the trunk longitudinal fold line or at a position away from the trunk longitudinal fold line and below the reference point in the height direction, The ends of the first auxiliary fold lines connected to each other near the reference point and on the longitudinal fold line of the trunk or at a position away from the longitudinal fold line of the trunk and below the reference point in the height direction are more than 3 mm away from the intersection and within a length range of less than 20% of the length of the top transverse fold line. On the roughly triangular surface of the side wall forming plate on the opening side, or the roughly triangular surface of the side wall forming plate on the opening side and the trunk plate on the opening side, a second auxiliary fold line extending longitudinally in the middle of the transverse direction is formed. A paper container as claimed in claim 1, wherein the reference point is 3 to 4 mm away from the intersection in the vertical direction, and the end of the first auxiliary fold line is 5 to 6 mm away from the intersection. A paper container as claimed in claim 1 or 2, wherein the first auxiliary fold line that is curved downward is in the shape of an arc, a V-shape, a polygon, or a combination thereof. A paper container as claimed in claim 1 or 2, wherein the first auxiliary fold line is a continuous line. A paper container as claimed in claim 1 or 2, wherein the first auxiliary fold line is a discontinuous line. A paper container as claimed in claim 1 or 2, wherein the lowest point of the curve of the first auxiliary fold line is located at the left-right center of the body plate on the opening side. A paper container as claimed in claim 1 or 2, wherein the first auxiliary fold line is symmetrical. A paper container as claimed in claim 1, wherein, the lower side end portion of the second auxiliary fold line located on the lowermost point side of the first auxiliary fold line is located at or near the lowermost point of the first auxiliary fold line, and the upper side end portion located on the vertex side of the roughly triangular face portion is located at or near the vertex of the roughly triangular face portion. A paper container as claimed in claim 1 or 2, wherein: A punctuation mark display portion indicating a pressed punctuation mark is provided at or near the center of the top horizontal fold line, spanning the above-mentioned roughly triangular face portion and the above-mentioned body plate, or on either of the above-mentioned roughly triangular face portion and the above-mentioned body plate. As in claim 9, the paper container, wherein the punctuation mark display portion is formed by embossing. A paper container as claimed in claim 1 or 2, wherein the upper edge of the inner top sealing plate connected to the upper portion of the side wall forming plate on the side that can be opened to form a pouring outlet is in a straight line shape. A paper container as claimed in claim 1 or 2, wherein, a first easy-peeling area is provided on the inner surface of the inner top layer sealing plate on the upper part of the side wall forming plate connected to the side of the openable pouring outlet, and a second easy-peeling area overlapping the first easy-peeling area is provided on the inner surface of the outer top layer sealing plate located on both sides thereof and connected to the upper part of the pair of gable roof forming plates, in a portion approximately half in the horizontal direction and close to the inner top layer sealing plate. As in claim 12, the paper container, wherein, the first easy-peeling area is provided at both ends of the inner top sealing plate in the transverse direction, leaving an end sealing area of a predetermined transverse width, and the second easy-peeling area is provided at an end sealing area of a predetermined transverse width close to the inner top sealing plate, and the first easy-peeling area and the second easy-peeling area are provided at both ends of the first easy-peeling area and the end of the second easy-peeling area close to the inner top sealing plate, respectively having: an extension portion inclined in a manner that the body plate side becomes longer from the top toward the bottom. A paper container as described in claim 1 or 2, wherein the transverse width of the body plate is less than 57 mm. A paper container as claimed in claim 1 or 2, wherein, a straw spout is provided on the gable roof forming plate, and the straw spout is formed by a first half cut formed from the back side to serve as a straw insertion port and a second half cut formed from the front side to surround the first half cut.

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