JP7028571B2 - Gazette bag - Google Patents

Description

In the present invention, a synthetic resin spout (extraction member) is fixed to the upper part of a bag with a gusset made of a synthetic resin sheet, and various liquids and powders such as foods, chemicals, cosmetics, and detergents are used. It relates to a gusset bag body that is used as a packaging bag as it is or with a spout attached.

Conventionally, various pouches and gusset bags (on both the left and right sides) made of synthetic resin films, laminated films, and other sheets have been used as packaging bags for various liquids and powders such as foods, chemicals, cosmetics, and detergents. (So-called gusseted ones) are widely used, and pouches with spouts and gusset bags with spouts in which a hard synthetic resin spout (pouring member) is fixed to the upper edge of those pouches and gusset bags. Is also used (Patent Document 1).

As a method of manufacturing such a gusset bag with a spout, the synthetic resin sheet laminated in half is sandwiched between the left and right ends of the two front and back synthetic resin sheets, and the left and right sides of the synthetic resin sheet laminate are sandwiched. And the bottom is heat-sealed to form a three-sided bag with a gusset, and then the adhesive provided at the base end of the spout is inserted into the opening of the three-sided bag, and the front and back of the synthetic resin sheet laminate are inserted. A method of fusing two synthetic resin sheets to the bonded portion is adopted.

Japanese Unexamined Patent Publication No. 2011-31895

However, in the method for manufacturing a gusset bag with a spout as in Patent Document 1, when the spout is fixed to the opening of the three-sided bag with a gusset, the synthetic resin sheet constituting the gusset and the synthetic resin on the front and back sides are used. It is very difficult to align the spout because it slips against the seat. Therefore, due to the fact that the spout is not fused at an appropriate position, the fusion strength between the spout and the synthetic resin sheet on the front and back may be lowered. Further, in the conventional gusset bag as in Patent Document 1, since the tubular spout for extracting the contents is fixed in a vertically standing state in the center of the upper end edge, the contents are sufficiently filled. Even if it is, there is a problem that the contents cannot be extracted unless it is tilted at a large angle.

An object of the present invention is to solve the problems of the conventional method for manufacturing a gusset bag with a spout, the fixing strength (fusing strength) of the fixing portion of the spout is high, and the contents may leak even when pressure is applied. It is an object of the present invention to provide a gusset bag body for forming a gusset bag with a spout, which enables the production of a non-gusset bag with good yield, easily and efficiently. Another object of the present invention is to solve the problems of the conventional gusset bag, to easily extract the contents, and to provide a practical gusset bag that is easy to manufacture.

Of the present inventions, the invention according to claim 1 is formed in a bag shape having gussets on both the left and right sides by a synthetic resin sheet, and has an opening for inserting and fixing a synthetic resin spout. It is a gusset bag provided, and the gussets on both the left and right sides are formed by sandwiching the folded material folded in half on the left and right of the body material on the front and back, respectively, and the opening is either left or right. It is provided in the upper corner, and the height position at the upper end of the left and right folding materials is lower than the height position of the upper end edge of the front and back body materials, and at the upper end of the left and right folding materials. The portion is made of synthetic resin and is heat-sealed on the back surface of the front and back body members by a strip-shaped member having a constant width, and the strip-shaped member is heated below each heat-sealed portion of the strip-shaped member and the left and right folding members. A band-shaped reinforcing heat-sealing part with a fixed width, which is made by heat-sealing one of the sealed front and back body materials and the left and right folding materials, is the lower edge of each folding line of the left and right folding materials and the heat-sealing part of the band-shaped member. It is provided so as to incline downward from the center side to the outside in the installation mode including the intersection with, and the inclined upper end edge of the reinforcing heat seal portion is the fold line of the left and right folding materials and the heat seal of the strip-shaped member. Passing above the intersection with the lower end edge of the portion, and the inclined lower end edge of the reinforcing heat seal portion is below the intersection of the folding line of the left and right folding materials and the lower end edge of the heat seal portion of the strip-shaped member. It is in a state of passing through the side, and the inner edge of each reinforcing heat seal portion is in a state of being located inside the folding line of each folding material at a position where it overlaps with the strip-shaped member. It is characterized by.

The invention according to claim 2 is a gusset bag body formed in a bag shape having gussets on both the left and right sides by a synthetic resin sheet, and the gussets on both the left and right sides are on the left and right sides of the front and back body materials, respectively. It is formed by sandwiching the folded material folded in half, and the height position at the upper end of the left and right folded materials is lower than the height position of the upper end edge of the front and back body materials. In addition, the upper end of the left and right folding materials is heat-sealed on the back surface of the front and back body materials by a band-shaped member made of synthetic resin and having a constant width, and is cut to form an extraction port for the contents. An extraction port forming portion for the purpose is formed above the upper ends of the left and right folding materials at at least one of the upper left and right corners, and below each heat-sealing portion between the strip-shaped member and the left and right folding materials. In addition, a band -shaped reinforcing heat-sealing part with a certain width, which is made by heat-sealing either the front or back body material with the band-shaped member heat-sealed and the left and right folding materials, is formed on each folding line of the left and right folding materials and the band-shaped member. It is provided so as to incline downward from the center side to the outside in the installation mode including the intersection with the lower end edge of the heat seal portion, and the inclined upper end edge of the reinforcing heat seal portion is the folding line of the left and right folding materials. Passing above the intersection of the and the lower end edge of the heat seal portion of the strip-shaped member, and the inclined lower end edge of the reinforcing heat seal portion is the folding line of the left and right folding materials and the lower end of the heat seal portion of the strip-shaped member. It is in a state of passing below the intersection with the edge, and the inner edge of each reinforcing heat seal portion is located inside the folding line of each folding material at a position where it overlaps with the strip-shaped member. It is characterized by being in a state .

In the invention described in claim 3, in the invention described in claim 1 or 2, the portion near the upper end of the left and right folding members is made of a single strip-shaped member, which is either the front or back of the body material. It is characterized by being heat-sealed together on the back surface.

In the gusset bag body according to claim 1, the height position at the upper end of the left and right folding materials is lower than the height position at the upper end edge of the front and back body members, and the height position near the upper ends of the left and right folding materials. Because the part is heat-sealed on the back side of either the front or back body material by the band-shaped member, when the spout is fixed (fused) to the opening of either the left or right corner (corner) of the upper part, the spout Does not interfere with the left and right folding materials, so that the spout fixing work can be performed efficiently and easily. Further, the gusset bag according to claim 1 can be manufactured inexpensively and easily because it is not necessary to fold the upper end portions of the left and right folding materials during the manufacturing process. The gusset bag with a spout formed by fixing (fusing) the spout to the opening of the upper left or right corner of the gusset bag according to claim 1 has contents without being tilted at a large angle. In addition to being able to easily extract objects, the spout is closer to the left or right, so even if the contents are low, it will not easily tip over.
In addition, in the gusset bag body according to claim 1, one of the front and back body materials and the left and right folding materials in which the band-shaped member is heat-sealed is placed below each heat-sealing portion between the band-shaped member and the left and right folding materials. A heat-sealed strip-shaped reinforcing heat-sealing portion with a certain width is installed downward from the center side to the outside in an installation mode including the intersection of each folding line of the left and right folding materials and the lower end edge of the heat-sealing portion of the strip-shaped member. It is provided so as to be inclined , and the inclined upper end edge of the reinforcing heat seal portion passes above the intersection of the folding line of the left and right folding materials and the lower end edge of the heat sealing portion of the strip-shaped member, and is reinforced. The inclined lower end edge of the heat seal portion for reinforcing passes below the intersection of the folding line of the left and right folding material and the lower end edge of the heat sealing portion of the strip-shaped member, and each reinforcing heat seal is provided. Since the inner edge of the portion is located inside the folding line of each folding material at the position where it overlaps with the band-shaped member, the bag resistance when dropped is high.

In the gusset bag according to claim 2, the height position of the upper ends of the left and right folding materials is lower than the height position of the upper end edges of the front and back body members, and the upper ends of the left and right folding materials are used. Is heat-sealed on the back surface of the body material on the front and back by a band-shaped member, and the extraction port forming portion is formed above the upper ends of the left and right folding materials. When forming the extraction port, the cutting line does not interfere with the upper end portions of the left and right folding materials, so that the extraction port forming portion can be cut easily and neatly. Further, the gusset bag according to claim 2 can be manufactured inexpensively and easily because it is not necessary to fold the upper end portions of the left and right folding materials during the manufacturing process.

In addition, the gusset bag according to claim 2 is provided with an extraction port forming portion at either the left or right upper corner, so that the contents can be easily extracted without tilting at a large angle. .. Further, it is possible to adopt a filling and sealing method of the contents, in which the peripheral edge other than the upper end edge is first heat-sealed to form a bag-shaped object, and then the contents are filled and the upper end edge is heat-sealed. Since it is not necessary to turn it upside down before and after filling the contents, it is possible to configure the production line (content filling line) inexpensively and simply. Further, since it is not necessary to extract the contents through the spout, the remaining contents can be smoothly extracted to the end without staying. Further, since it is not necessary to fix the spout on the upper part, it can be manufactured easily and inexpensively.
Further, in the gusset bag body according to claim 2, one of the front and back body materials and the left and right folding materials, in which the band-shaped member is heat-sealed, is heated below each heat-sealing portion between the band-shaped member and the left and right folding materials. The band-shaped reinforcing heat-sealing part that is sealed is inclined downward from the center side to the outside in the installation mode including the intersection of each folding line of the left and right folding materials and the lower end edge of the heat-sealing part of the band-shaped member. The inclined upper end edge of the reinforcing heat seal portion passes above the intersection of the folding line of the left and right folding materials and the lower end edge of the heat sealing portion of the strip-shaped member, and is used for reinforcement. The inclined lower end edge of the heat seal portion passes below the intersection of the folding line of the left and right folding material and the lower end edge of the heat seal portion of the strip-shaped member, and each reinforcing heat seal portion Since the inner edge of the band is located inside the folding line of each folding material at the position where it overlaps with the band-shaped member, the bag resistance when dropped is high.

The gusset bag according to claim 3 is manufactured because the upper end portions of the left and right folding members are heat-sealed together on the back surface of either the front or back body material by a single strip-shaped member. Since the left and right folding materials can be heat-sealed to the body material in one heat-sealing process, it can be manufactured easily and inexpensively.

It is explanatory drawing (front view) which shows the gusset bag body. It is explanatory drawing which shows the gusset bag body (a to e are the AA line end view, the BB line end view, the CC line end view, the DD line end view, E-, respectively in FIG. It is an E-line end view). It is explanatory drawing which shows the spout (a is a front view, b is a bottom view, c is a side view). It is explanatory drawing (front view) which shows the gusset bag body (the gusset bag with a spout) to which a spout is fixed. It is explanatory drawing (perspective view) which shows the gusset bag body (the gusset bag with a spout) to which a spout is fixed. It is explanatory drawing (front view) which shows the gusset bag body. It is explanatory drawing (perspective view) which shows the gusset bag body. It is explanatory drawing which shows the modification example of the gusset bag body (a is a front view, b is a GG line end view in a). It is explanatory drawing (perspective view) which shows the modification example of the gusset bag body (the gusset bag with a spout) to which a spout is fixed. It is explanatory drawing (front view) which shows the modification example of the gusset bag body (the gusset bag with a bag) which fixed the spout. It is explanatory drawing (front view) which shows the modification example of the extraction port formation part. It is explanatory drawing (front view) which shows the modification example of the gusset bag body. It is explanatory drawing (front view) which shows the modification example of the gusset bag body.

The gusset bag body according to the present invention is formed of a synthetic resin sheet. The synthetic resin sheet referred to here is a laminated film in which a synthetic resin film used as a packaging material for foods, chemicals, cosmetics, detergents, etc. is laminated, or a laminated film in which a synthetic resin film and paper, aluminum foil, etc. are laminated. That is. The synthetic resin sheet used for the gusset bag body according to the present invention needs to have at least one surface (inner surface) having thermal adhesiveness.

As such a synthetic resin sheet, a laminated film or the like in which a heat-adhesive film such as a polyethylene film or a polypropylene film is laminated on a base film such as a polyester film, a nylon film or a polypropylene film can be preferably used. Further, a laminated film having three or more layers in which a polyester film, a nylon film, or the like is sandwiched between such laminated films can also be preferably used.

As the base film and the film forming the intermediate layer, an unstretched film can be used, or a uniaxially stretched film or a biaxially stretched film can be used. Further, a metal foil is required at the interface between the base film and the heat-adhesive film, the interface between the base film and the film forming the intermediate layer, and the interface between the film forming the intermediate layer and the heat-adhesive film. It is also possible to provide a layer or a metal vapor deposition layer. On the other hand, the thickness of the synthetic resin sheet is not particularly limited, but is preferably 40 to 250 μm, more preferably 110 to 180 μm, from the viewpoints of storage performance for the contents, tear resistance and the like.

In the gusset bag body according to the present invention, the above-mentioned synthetic resin sheet is laminated in such a manner that the folded material folded in half is sandwiched between the left and right sides of the body material on the front and back sides, and the lower portion (bottom portion) and the side portion of the laminated body are laminated. Manufactured by heat-sealing into a bag. Further, when making such a bag, the height position at the upper end of each of the left and right folding materials is made lower than the height position of the upper end edge of the front and back body members, and the height position at the upper end of each of the left and right folding materials is set. It is necessary to heat-seal the portion of the above to the back surface of the front and back body materials with a band-shaped member made of synthetic resin and having a constant width.

Each heat seal (side seal part, bottom seal part formation, heat seal of strip-shaped member, etc.) and cutting can be performed as a series of processing using a gusset bag making machine, or batch (non-batch). It is also possible to carry out as a series of processing). The temperature of the heat seal is not particularly limited, but when a synthetic resin sheet using a polyethylene (linear low-density polyethylene) film as a heat-adhesive film is used, the temperature should be within the range of 170 to 210 ° C. Is preferable.

Further, the gusset bag body according to the present invention is formed to be substantially rectangular in front view, but the size thereof is not particularly limited, and the height and width are adjusted within a range of approximately 50 to 350 mm as necessary. can do. Further, the gusset bag body according to the present invention is provided with gussets (parts folded inward in half) on both the left and right sides, but the width of the gusset (width of the folded part) is also particularly limited. However, it can be adjusted as needed within a range of approximately 10 to 75 mm.

Further, when forming a gusset bag with a spout using the gusset bag according to the present invention, the spout formed of the synthetic resin is fixed inside the opening of the gusset bag formed as described above (the spout formed by the synthetic resin is fixed (). Fusing). As the spout, one formed of a hard synthetic resin or the like can be preferably used, and the spout body (a member in which an adhesive portion is continuously provided at the lower part of the pouring portion) and the cap are separately molded2. It may be a piece type, or it may be a one-piece type in which the spout body and the cap are integrally molded via a thin wall portion. The material of the spout must be able to heat-bond (fuse) to the heat-adhesive film of the gusset bag, and such materials include polyethylene (linear low density polyethylene, medium density polyethylene or high density). Polyethylene, etc.), polypropylene, polyester, etc. can be mentioned.

On the other hand, the gusset bag body according to the present invention can be used not only as a member (semi-finished product) for forming the above-mentioned gusset bag with a spout, but also at least one of the upper left and right corners (corners). By providing an extraction port forming portion for cutting and forming an extraction port for the contents, it can also be used as a final product of the storage bag (a product before filling the contents).

As such, when the gusset bag body according to the present invention is provided with an extraction port forming portion (an extraction port forming portion for cutting to form an extraction port for the contents), the extraction port forming portion is formed. The portion can be provided in any of the left and right corners (corners) of the upper portion, or can be provided in both the left and right corners. In addition, the extraction port forming portion is formed by providing a constriction, a notch, a notch, and a notch at the edge so that the user can cut it by hand, and perforations (non-through holes are arranged in a straight line or a curved line) at the corner. It can be formed by a method of providing a groove (engraving) or a method of forming (engraving) a groove in a linear or curved shape with a laser. In addition, for the purpose of enlarging the extraction port, parallel folding lines (those that are convex outward) should be provided so as to be orthogonal to the line segment to be cut, or a cylindrical body made of synthetic resin should be welded. Is also possible. When the extraction port forming portion is formed so that the inclination angle (inclination angle with respect to the horizon) of the line segment cut by the user is 40 ° or more and less than 70 °, the contents are extracted from the formed extraction port. It is preferable because it becomes easy.

[Example 1]
<Structure of gusset bag>
Hereinafter, examples of the gusset bag body of the present invention will be described in detail with reference to the drawings. 1 and 2 show the gusset bag body of the first embodiment, in which the gusset bag body 1 forms a gusset bag with a spout by fixing a spout to an upper left corner (corner). A band-shaped member (member) for fusing the front and back synthetic resin body members 2a and 2b, the left and right folding materials 3a and 3b, and the back side body material 2b with the folding materials 3a and 3b. , By superimposing them in a predetermined manner and heat-sealing a predetermined portion, the bag shape with an open upper portion is formed.

For the front and back body materials 2a and 2b, a 12 μm-thick polyester film (intermediate layer) with aluminum vapor deposition is bonded onto a 15 μm-thick nylon film (base film) so that the aluminum vapor-deposited surface is bonded to the nylon film. It is formed into a substantially rectangular shape by a synthetic resin sheet formed by laminating a linear low-density polyethylene film (heat-adhesive film) having a thickness of 130 μm on the same. It has a size of 130 mm. Further, the upper left portions of the front and back body members 2a and 2b are cut diagonally in order to form an opening for fixing the spout.

Then, on the left and right sides of the body materials 2a and 2b, rectangular folding materials 3a and 3b formed of the same synthetic resin sheet as the body materials 2a and 2b, respectively, have a predetermined width (about 40 mm width). ) Is sandwiched in half. The vertical length of the folding members 3a and 3b is 170 mm, which is 70 mm shorter than the vertical length of the front and back body members 2a and 2b. The front and back body materials 2a and 2b are arranged with the linear low-density polyethylene film (heat-adhesive film) layer inside, and the folding materials 3a and 3b are linear low-density polyethylene films. The layers are arranged so that the front and back body members 2a and 2b are on the back side.

The front and back body materials 2a and 2b and the left and right folding materials 3a and 3b are laminated at the same position of the lower end edges, and the height position of the left and right folding materials 3a and 3b at the upper ends is the front and back body materials. It is about 70 mm lower than the height position of the upper end edge of. Further, the straight line connecting the upper end edges of the left and right folding members 3a and 3b is parallel to the upper end edges of the front and back body members 2a and 2b. Then, the portions near the upper ends of the left and right folding members 3a and 3b are fixed to the inner surface of the body member 2b on the back side by the band-shaped member 10.

The strip-shaped member 10 is a synthetic resin having a three-layer structure in which a linear (linear) low-density polyethylene (LLDPE) film having a thickness of 20 μm is laminated on top and bottom of a nylon film (base film) having a thickness of 15 μm. The sheet is formed in a strip shape (tape shape) of length (vertical width) × width = 30 mm × 130 mm (that is, the strip-shaped member 10 has thermal adhesiveness on both the front and back surfaces). The strip-shaped member 10 is heat-sealed to the folding material 3a, 3b and the back side body material 2b by being heated from the outside of the back side body material 2b while being pressed against the folding material 3a, 3b from the inside. It is in a state of being.

Then, as shown in FIG. 2, in the left and right portions below the center of the strip-shaped member 10 (center in the height direction), the outer surface (rear surface) of the strip-shaped member 10 and the back surfaces (front surface) of the folding members 3a and 3b are fused. They are worn together (see FIG. 2C), and in the parts other than the left and right below the center of the band-shaped member 10 (the middle part in the left-right direction below the center and the part above the center), the band is shaped. The outer surface (rear surface) of the member 10 and the back surface (inner surface) of the body member 2b are directly fused (see FIGS. 2 (d) and 2 (e)).

On the other hand, at the left and right side edges of the gusset bag 1 (including the laminated portion of the body members 2a and 2b and the folding members 3a and 3b), the strip-shaped side seal portions 5 and 5 having a constant width (about 7 mm) .. is provided, and in the side seal portions 5, 5 ..., the back surface of the body material 2a on the front side and the back surface of the folding materials 3a and 3b, and the back surface and the folding material 3a of the body material 2b on the back side are provided. , 3b are fused to each other on the back surface (see FIG. 2A). Further, at the upper end portions of the left and right folding members 3a and 3b in the side sealing portions 5, 5 ..., the back surface of the body member 2b and the front surface (front surface) of the strip-shaped member 10 are fused to each other. There is. In addition, the back surface of the body member 2a and the back surface of the body member 2b are directly fused to each other in the portion of the side seal portions 5, 5 ... Above the laminated portion with the band-shaped member 10. (See Fig. 2 (b)).

Further, at the upper end edge of the gusset bag 1, the body members 2a and 2b are heat-sealed over the entire width to form a strip-shaped head seal portion 8 having a constant height (about 7 mm). It is in a state of overlapping with the upper end portion of the right side seal portion 5. Then, in the head seal portion 8, the back surface of the body material 2a on the front side and the back surface of the body material 2b on the back side are fused to each other.

Further, in the upper left corner (corner portion) of the gusset bag body 1, the front and back body members 2a and 2b are cut diagonally, so that the inclined end edge 4 connects the upper end edge and the left end edge. It is in a formed state. The inclined edge 4 is inclined to the left by about 45 ° with respect to the horizontal upper end edge, and has a length of about 80 mm. The space between the side seal portion 5 on the left side edge of the inclined end edge 4 and the head seal portion 8 is an opening 9 for fixing (fusing) the spout.

On the other hand, at the lower end edge of the gusset bag 1, the bottom seal portion 7 is formed in a band shape having a substantially constant height (about 13 mm), and the side seal portions 5, 5 ... It overlaps. Then, in the central portion of the bottom seal portion 7, the back surface of the body material 2a on the front side and the back surface of the body material 2b on the back side are fused to each other, and in the left and right portions of the bottom seal portion 7, respectively. , The back surfaces of the body members 2a and 2b and the back surfaces of the folding members 3a and 3b are fused to each other.

Further, at the left and right lower end edges of the gusset bag body 1, a strip-shaped inclined seal portion 20 having a constant width (about 7 mm) is provided so as to reach the bottom seal portions 7 from the left and right side seal portions 5, 5 ... , 20 ... Are provided, and the inclined seal portions 20, 20 ... Are in a state of being inclined by about 45 ° with respect to the horizontal direction. Further, the outer edge of the inclined seal portions 20, 20 ... overlaps with the side seal portions 5, 5 ..., and the inner edge (lower end edge) of the inclined seal portions 20, 20 ... Overlaps the bottom seal portion 7.

Further, spot fusion portions 19 and 19 are provided on the left and right end portions (gusset portions) of the bottom seal portion 7, respectively. In the spot fusion portions 19 and 19, through holes (not shown) are provided so as to penetrate the folded members 3a and 3b folded in half, and the body member 2a on the front side is provided through these through holes. The back surface of the body and the back surface of the body material 2b on the back side are directly fused to each other.

<How to use the gusset bag>
(1) Formation of a gusset bag with a spout The gusset bag body 1 formed as described above can be used as a gusset bag with a spout by fixing the spout to the opening 9 in the upper left corner. FIG. 3 shows a spout to be fixed to the gusset bag body 1. The spout 11 is a so-called two-piece type in which the spout body 12 and the cap 13 are separately formed, and both the spout body 12 and the cap 13 are made of polyethylene. In the spout body 12, a four-layer structure adhesive portion 15 (fixed portion) having a substantially rhombic horizontal cross section for fusing with the gusset bag body is continuously provided at the lower part of the spout portion 14 for extracting the contents. Has been done. An extraction hole 18 is provided so as to vertically penetrate the spout body 12 and the adhesive portion 15. Further, thin plate-shaped fusion assist pieces 16 and 16 are projected on the left and right sides of the adhesive portion 15. The adhesive portion 15 has a height of about 10 mm.

When the spout 11 is fixed (fused) to the gusset bag body 1, the adhesive portion 15 of the spout 11 is attached to the opening portion 9 of the gusset bag body 1 (the portion near the edge of the inclined end edge 4) on the front and back sides. It is inserted between the body materials 2a and 2b. Then, a hot plate provided with a concave curved surface heated to a predetermined temperature (about 210 ± 5 ° C.) is pressed onto the body members 2a and 2b located outside the adhesive portion 15, and the adhesive portion of the spout 11 is adhered. 15 and the back surfaces of the body materials 2a and 2b are fused (heat-sealed). That is, by heat-sealing the edge portion of the inclined end edge 4 of the gusset bag body 1 with a constant width, the strip-shaped diagonal seal portion 6 having a constant width is formed into the side seal portion 5 and the head seal portion on the left side edge. It is formed so as to overlap with 8.

During the fixing work of the spout 11 described above, in the gusset bag 1, the left and right folding members 3a and 3b are fixed to the body member 2b by the band-shaped member 10 in the vicinity of the opening 9 and do not get in the way (interference). (No), so the spout 11 can be fixed very easily. Further, since the spout 11 is fused only to the body materials 2a and 2b having good flexibility, a gap may be created around the spout 11 to be fused to leak the contents to be filled later. do not do.

4 and 5 show a gusset bag with a spout formed by fixing the spout 11 to the gusset bag body 1. In the gusset bag 21 with a spout, an oblique sealing portion 6 having a constant width is formed on the inclined edge 4 at the upper left corner of the gusset bag body 1, and the front surface of the adhesive portion 15 of the spout 11 and the body material 2a are formed. The back surface is fused to each other, and the rear surface of the adhesive portion 15 of the spout 11 and the back surface of the body material 2b are fused to each other.

(2) Filling of contents The gusset bag 21 with a spout formed as described above is used by filling the inside from the extraction hole 18 of the spout 11 with the contents (for example, shampoo or the like). Then, when the liquid is filled in this way, the intermediate portion (the portion other than the upper and lower edge edges) of the folded members 3a and 3b folded in half expands, and the left and right front and rear inclined seal portions 20, 20 ... At the upper end portion (that is, the portion where the side seal portions 5, 5 ... and the inclined seal portions 20, 20 ... overlap), the body material 2a and the body material 2b are bent together with the folding materials 3a, 3b. In order to form a horizontally long rectangular bottom surface, the lower portion has a substantially rectangular parallelepiped shape (horizontal width x depth = about 130 mm x about 80 mm) (see FIG. 5). Therefore, the gusset bag 21 with a spout can be erected in a stable state and can be used as a product for display or the like.

<Effect of gusset bag>
As described above, the gusset bag 1 is formed by having gussets on both the left and right sides sandwich the folded members 3a and 3b folded in half on the left and right sides of the body members 2a and 2b on the front and back sides, respectively. The portion 9 is provided in the upper left corner, and the height position at the upper end of the left and right folding members 3a and 3b is lower than the height position of the upper end edges of the front and back body members 2a and 2b. Further, the upper end portions of the left and right folding members 3a and 3b are heat-sealed on the back surface of the body member 2b on the back side by a band-shaped member 10 made of synthetic resin and having a constant width. Therefore, in the gusset bag 1, when the spout 11 is fixed (fused) to the upper end edge, the spout 11 to be fixed does not interfere with the left and right folding members 3a and 3b, so that the spout 11 is fixed. Can be done efficiently and easily.

Further, in the gusset bag body 1, the upper end portions of the left and right folding members 3a and 3b are heat-sealed together with the back surface of the body member 2b on the back side by a single strip-shaped member 10, so that once at the time of manufacture. In the heat-sealing step of the above, the left and right folding materials 3a and 3b can be heat-sealed to the body material 2b, so that the left and right folding materials 3a and 3b can be easily and inexpensively manufactured.

In addition, the gusset bag 21 with a spout, in which the spout 11 is fixed (fused) to the opening 9 in the left corner of the head of the gusset bag 1, can easily extract the contents without tilting at a large angle. In addition, since the spout 11 is closer to the left side, it is difficult to tip over even when the contents are low.

[Example 2]
<Structure of gusset bag>
6 and 7 show the gusset bag body of Example 2. The structure of the upper left corner (corner) of the gusset bag 31 of the second embodiment is different from that of the first embodiment, and the upper left corner of the gusset bag 31 is cut by the user by hand. The extraction port forming portion 30 for forming the extraction port is formed. That is, in the upper left corner of the gusset bag 31, the portion near the upper end of the side seal portion 5 is in a state of greatly projecting from the left end edge to the inside (projecting portion 5p), and has a width of about 50 mm. have. The lower end edge of the protruding portion 5p is inclined by about 25 ° upward to the left, and the height of the protruding portion 5p at the right end edge and the height at the left end edge are about 30 mm and about 20 mm, respectively. It has become.

Further, a strip-shaped notch 22 having a width of about 10 mm and a height (height to the bottom) of 20 mm is provided at the upper left corner of the upper end edge of the gusset bag 31. The bottom of the notch 22 is inclined upward to the left by about 25 ° so as to be parallel to the lower end edge of the protruding portion 5p of the side seal portion 5, and the left end of the bottom is an acute angle. It has become. The notch 22 is formed as described above, so that the knob 24 having a width of about 20 mm is formed.

On the other hand, at the upper left corner of the left end edge of the gusset bag 31, a constriction 23 is formed in a portion about 35 mm below the upper end edge, and the innermost part of the constriction 23 is about 8 mm inward from the left end edge. It is in a state of being intruded. Further, the left edge above the constriction 23 is located inward by about 5 mm from the other left edge (excluding the constriction 23). Then, the extraction port forming portion 30 is formed in the upper left corner of the gusset bag 31 with the notch 22 and the constriction 23 as boundaries. The portion where the constriction 23 near the upper end of the side seal portion 5 is formed and the portion above the constriction 23 (excluding the protruding portion 5p) are also band-shaped with a constant width (about 7 mm). As described above, the gusset bag body 31 of the second embodiment has a structure of the upper left corner different from that of the gusset bag body 1 of the first embodiment, but the structure other than the upper left corner is the gusset of the first embodiment. The structure is the same as that of the bag body 1.

<How to use the gusset bag>
The gusset bag 31 configured as described above is used by filling the contents from the opening O (the portion from the protruding portion 5p to the side sealing portion 5 on the right end edge) of the upper end edge that is not heat-sealed. Then, after filling the contents, the body members 2a and 2b of the opening O at the upper end edge thereof are heat-sealed to form a strip-shaped head seal portion 25 having a constant height (about 5 mm to 10 mm). Together (see FIG. 7), the gusset bag 31 is sealed. The head seal portion 25 is formed so as to overlap the protruding portion 5p and the side seal portion 5 on the right end edge.

When the gusset bag 31 is filled with the contents as described above, the intermediate portion (the portion other than the upper and lower edge edges) of the folding members 3a and 3b expands, and the upper ends of the left, right, front and rear inclined seal portions 20, 20 ... At the edge portion (that is, the portion where the side seal portions 5, 5 ... and the inclined seal portions 20, 20 ... overlap), the body material 2a and the body material 2b are bent together with the folding materials 3a, 3b. In order to form a horizontally long rectangular bottom surface, the lower portion has a substantially rectangular parallelepiped shape (horizontal width x depth = about 130 mm x about 80 mm) (see FIG. 7). Therefore, the gusset bag 31 can be erected in a stable state and can be used as a product for display or the like.

Then, when the contents are extracted, the contents are cut by the operator diagonally downward (in the direction of the broken line in FIG. 6) starting from the acute-angled portion at the left end of the notch 22 of the extraction port forming portion 30. To form an extraction port. Since the base film and the intermediate layer of the body materials 2a and 2b are both biaxially stretched films, they can be easily cut by hand. The gusset bag 31 having the extraction port formed in this way can extract the contents at a smaller inclination angle than the conventional gusset bag (with the spout fixed to the center of the upper end edge).

<Effect of gusset bag>
In the gusset bag body 31 of the second embodiment, as described above, the height position at the upper end of the left and right folding members 3a and 3b forming the gussets on both the left and right sides is the upper end edge of the front and back body members 2a and 2b. It is lower than the height position, and the upper ends of the left and right folding materials 3a and 3b are heat-sealed on the back surface of the body material 2b on the back side by a band-shaped member 10 made of synthetic resin and having a constant width. In addition, an extraction port forming portion 30 for cutting to form an extraction port for the contents is formed at the upper left corner above the upper ends of the left and right folding members 3a and 3b. Therefore, when the extraction port forming portion 30 is cut to form the extraction port, the gusset bag 31 does not interfere with the upper end portions of the left and right folding members 3a and 3b, so that the gusset bag 31 can be easily and neatly formed. Can be cut. Further, the gusset bag 31 can be manufactured inexpensively and easily because it is not necessary to fold the upper end portions of the left and right folding members 3a and 3b during the manufacturing process.

Further, since the gusset bag 31 of the second embodiment is provided with the extraction port forming portion 30 at the upper left corner, the contents can be easily extracted without tilting at a large angle. Further, it is possible to adopt a filling and sealing method of the contents, in which the peripheral edge other than the upper end edge is first heat-sealed to form a bag-shaped object, and then the contents are filled and the upper end edge is heat-sealed. Since it is not necessary to turn it upside down before and after filling the contents, it is possible to configure the production line (content filling line) inexpensively and simply. Further, since it is not necessary to extract the contents through the spout 11, the remaining contents can be smoothly extracted to the end without staying. Further, since it is not necessary to fix the spout 11 on the upper portion, it can be manufactured easily and inexpensively.

Further, in the gusset bag body 31 of the second embodiment as well as the gusset bag body 1 of the first embodiment, the upper end portions of the left and right folding members 3a and 3b are formed by a single strip-shaped member 10 to form a back body material. Since the back surface of 2b is heat-sealed together, the left and right folding materials 3a and 3b can be heat-sealed to the body material 2b in one heat-sealing step at the time of manufacturing, so that it can be manufactured easily and inexpensively. can.

<Example of changing the gusset bag>
The configuration of the gusset bag body according to the present invention is not limited to the embodiment of the above embodiment, and the material, size (height, width, width of gusset, etc.) of the synthetic resin film, the bottom seal portion, and the like. The configuration of the side seal portion, the inclined seal portion, and the like can be appropriately changed as necessary without departing from the spirit of the present invention. For example, the synthetic resin sheet constituting the gusset bag is not limited to the one in which a nylon film, a polyester film, and a polyethylene film (linear low-density polyethylene film) are laminated as in the above embodiment, and other sheets are used. It may be made by laminating a synthetic resin film made of a material. When a synthetic resin sheet in which a nylon film, a polyester film, and a polyethylene film (linear low-density polyethylene film) are laminated is used, the strength of the gusset bag is good. , The gusset bag body can be easily manufactured.

Further, the gusset bag body according to the present invention is not limited to the one provided with the inclined seal portion at the lower end as in the above embodiment, and gradually widens from the upper side to the lower side at the lower ends of the left, right, front and back (). It may be provided with a tapered seal portion (so that the front view is substantially triangular). Even when such a configuration is adopted, in the gusset bag body, when the liquid is filled, the middle portion of the folded material folded in half expands, and the front and back body members are left and right at the portion near the upper end of the tapered seal portion. Since it bends together with the folding material to form a horizontally long rectangular bottom surface, the lower part becomes a substantially rectangular parallelepiped shape, so that it can be erected in a stable state.

Further, the gusset bag body according to the present invention has folds formed only on the left and right sides of the body material (that is, the folds are sandwiched only on the left and right sides of the body material) as in the above embodiment, and the lower part of the body material. It is also possible to form a folding portion (that is, a folding material sandwiched in the lower part of the body material). FIG. 8 shows an example of a gusset bag body in which folding portions are formed on the left and right sides and the lower portion of the body material. , Cross section (vertical cross section) is bent diagonally inward so as to form an M shape, and inside the bent portions F and F, the same composition as the body members 2a and 2b and the folding members 3a and 3b The left and right ends of the lower folding member 4 formed by folding a horizontally long strip formed of a resin sheet in half (so that the heat-adhesive surface is located on the outside) are sandwiched. Then, on the outside of the bent portions F and F near the lower ends of the side sealing portions 5, 5 ... The back surfaces of 3b are fused to each other, and the back surfaces of the folding materials 3a and 3b and the back surfaces of the lower folding material 4 are fused to each other inside the bent portions F and F. Further, the bottom sealing portions 7'and 7'are formed by heat-sealing the portion near the lower end edge (the portion where the folding material 4 is sandwiched) in the shape of a band having a constant height, and the back surface of the body material 2a is formed. And the back surface of the folding material 4, and the back surface of the body material 2b and the back surface of the folding material 4 are fused to each other.

FIG. 9 shows a gusset bag 21'with a spout in which a spout 11 is fixed to a gusset bag body 1'structured as described above, and the gusset bag 21'with a spout is filled with contents. The folded material 3a and 3b have a fixed width portion that expands to form a rectangular side surface, and the folding material 4 expands to form a rectangular bottom surface near the bottom, so that the folded material 3a and 3b are in an extremely stable state. You can stand up.

Further, the gusset bag body according to the present invention is not limited to the one in which the left and right folding materials are heat-sealed to one (front side or back side) body material by a single band-shaped member as in the above embodiment, and two sheets are used. It is also possible to change the left and right folding materials to those that are heat-sealed to separate body materials by using the band-shaped member. Further, in the case where the left and right folding materials are heat-sealed to separate body materials, the left and right folding materials should be heat-sealed to the same body material (front side or back side body material). It is also possible to heat-seal the left and right folding materials to separate body materials (front or back body materials). Even when such a configuration is adopted, the gusset bag body can easily perform the work of fixing (fusing) the spout to either the left or right upper corner.

In addition, the strip-shaped member is not limited to the one made of a synthetic resin sheet having a three-layer structure in which an LLDPE film is laminated on the upper and lower sides of a nylon film (base film) as in the above embodiment, and different synthetics are used. It is also possible to change to one made of a synthetic resin sheet formed of resin. Further, the layer structure and the thickness of the strip-shaped member can be appropriately changed as needed. Further, the strip-shaped member is not limited to a horizontally long and simple tape-shaped member as in the above embodiment, and may be a member having a different vertical width of a predetermined portion, a member having a through hole, or the like.

On the other hand, the method for manufacturing a gusset bag with a spout using the gusset bag according to the present invention is a gusset bag in which the side portion, the lower portion (bottom portion), and the head are heat-sealed as in the above embodiment (Example 1). It is not limited to the manufacturing method in which the spout is fixed (fused) to the opening of either the left or right upper corner of the gusset bag body, and the side and the lower part (bottom) are heat-sealed. A method may be used in which the spout is fixed (fused) to the opening, the contents are filled from the opened (unheat-sealed) head, and then the unheat-sealed portion of the head is heat-sealed. .. According to such a manufacturing method, it is possible to easily fill contents that are difficult to fill from a spout such as highly viscous contents, and it is also possible to use a one-piece type spout or a check valve structure as the spout. It will be possible.

Further, as described above, after fixing the spout to the opening of the upper corner of either the left or right side of the gusset bag body in which the side portion and the lower portion are heat-sealed, the spout is filled from the opened head, and then the head is filled. When a gusset bag with a spout (filled with contents) is manufactured by a method of heat-sealing the unheat-sealed portion of the portion, the gusset bag (before filling with the contents) is the above-described embodiment. As described above, the inner edge of the heat-sealed portion of the inclined edge is not limited to the inclined one, and the inner edge of the heat-sealed portion of the inclined edge may be vertically formed. FIG. 10 shows a gusset bag with a spout in which the inner edge of the heat-sealed portion of the inclined edge edge is vertically formed, and the gusset bag 41 with a spout has a body on the front and back sides of the inclined edge edge 4. By sandwiching the spout 11 between the materials 2a and 2b and heat-sealing the inclined edge 4 in a strip shape having a predetermined width (about 7 mm) (oblique sealing portion 6), the spout 11 is between the body materials 2a and 2b. It is fixed (fused) to. The lower end edge (outer edge) of the heat-sealed portion (tilted seal portion 17) of the inclined end edge 4 is in a state of overlapping with the side seal portion 5. On the other hand, the upper end edge (inner edge) of the inclined seal portion 17 is vertically formed (α portion in FIG. 10), and is lateral to the side opposite to the installation side of the inclined edge 4 (right side in FIG. 10). It is substantially parallel to the inner edge of the upper end of the seal portion 5. The gusset bag 41 with a spout configured as described above is unlikely to have its inner edge portion (α portion in FIG. 10) peeled off when the contents are filled from the opening O at the upper end. It is possible to seal with a good yield without causing a failure in sealing when the contents are filled.

Further, when the gusset bag body according to the present invention is provided with an extraction port forming portion (an extraction port forming portion for cutting to form an extraction port for the contents), the extraction port forming portion is used. , Not limited to the one provided with a relatively large notch as in the above embodiment (Example 2), but the one provided with a notch or a notch at the end edge as shown in FIG. 11 (a), FIG. 11 (b). As described above, it is also possible to change the corner to one having perforations (formed by arranging non-through holes in a straight line or a curved shape). Further, the extraction port forming portion is not limited to the one in which two flat body members are overlapped as in the above embodiment, and is cut for the purpose of enlarging the extraction port as shown in FIG. 11C. Those provided with parallel folding lines (those that are convex outward) 40, 40 so as to be orthogonal to the line segment, those in which a cylindrical body 41 made of synthetic resin is welded as shown in FIG. 11 (d), etc. It is also possible to change to. Further, the extraction port forming portion is not limited to the one formed so that the area is smaller than that of the opposite corner (corner without the extraction port forming portion) as in the above embodiment, and is not limited to that formed in FIG. 11 (e). ), It is also possible to change to one formed so that the area is larger than the opposite corner.

Further, in the gusset bag body according to the present invention, for the purpose of improving the rupture resistance when dropped, either the front or the back surface where the band-shaped member is heat-sealed below each heat-sealed portion of the band-shaped member and the left and right folding members. It is also possible to provide a reinforcing heat-sealing portion formed by heat-sealing the body material and the left and right folding materials. Further, when the gusset bag body is provided with the reinforcing heat-sealing portion as described above, the reinforcing heat-sealing portion is the intersection of the folding lines of the left and right folding materials and the lower end edge of the heat-sealing portion of the strip-shaped member. Or so that the lower end edge of the heat-sealing portion for reinforcement passes through the intersection of each folding line of the left and right folding materials and the lower end edge of the heat-sealing portion of the strip-shaped member. Is preferable.

FIG. 12 shows an example of a gusset bag body provided with a reinforcing heat seal portion as described above. The gusset bag 51 is in a state where the folding members 3a and 3b are fixed to the inner surface of the body member 2b on the back side by the band-shaped member 10 at the portion near the upper end. Further, below each heat-sealed portion between the strip-shaped member 10 and the left and right folding members 3a and 3b, for reinforcement for increasing the degree of thermal adhesion between the back side body material 2b and the left and right folding materials 3a and 3b, respectively. Heat seal portions 27a and 27b are provided. In the reinforcing heat seal portions 27a and 27b, the left and right folding members 3a and 3b are placed on the back side body material 2b, and the strip-shaped member 10 is placed near the upper ends of the folding materials 3a and 3b. After heat-sealing, from the outside of the left and right folding members 3a and 3b placed on the back side body material 2b (for the inner edge edges of the reinforcing heat-sealing portions 27a and 27b, the band-shaped member 10 is used. It is formed by pressing a hot plate (metal plate) heated to a predetermined temperature (about 210 ± 5 ° C.) (from the outside). The reinforcing heat seal portions 27a and 27b have a band shape with a constant width (about 7.0 mm), and are in a state of being inclined downward at an angle of about 45 ° from the center side to the outside.

Further, in each of the reinforcing heat seal portions 27a and 27b, the inner edge is located inside the fold line (ridge line) of each fold material 3a and 3b, and the outer edge portion is located. It is in a state of overlapping with the left and right side seal portions 5 and 5. In addition, the reinforcing heat seal portions 27a and 27b have the inclined lower end edges of the left and right folding members 3a and 3b when viewed from a direction orthogonal to the surfaces of the front and back body members 2a and 2b. It is in a state of passing through the intersection points 26a and 26b between the wire and the lower end edge of the heat-sealed portion of the strip-shaped member 10. In those reinforcing heat seal portions 27a and 27b, the back surface of the body material 2b on the back side and the back surface of the folding material 3a and 3b are fused to each other.

In the gusset bag 51 configured as described above, the heat-sealing strength of each heat-sealing portion between the band-shaped member 10 and the left and right folding members 3a and 3b is enhanced by the reinforcing heat-sealing portions 27a and 27b, and when dropped. The pressure of the generated contents does not easily concentrate on the heat-sealed parts of the band-shaped member 10 and the left and right folding members 3a and 3b, and the sealing strength is good. Therefore, even if the band-shaped member 10 is accidentally dropped, the contents are broken. There is no situation of leaking things. Further, since the gusset bag 51 has a lower end edge in which the reinforcing heat seal portions 27a and 27b are inclined downward from the center side to the outside, the contents are folded in when the contents are taken out (poured out). It is hard to remain between the parts.

In addition, even when the gusset bag body is provided with a strip-shaped reinforcing heat-sealing portion having a constant width below each heat-sealing portion between the strip-shaped member and the left and right folding members as in the above embodiment, the gusset bag is reinforced. As shown in FIG. 12, the installation mode of the heat seal portion for reinforcement is as shown in FIG. The installation mode is not limited to the state in which the folding line passes through the intersection of the lower end edge of the heat-sealed portion of the strip-shaped member, and the reinforcing heat-sealed portions 27a'and 27b' are left and right as in the gusset bag body 61 of FIG. The installation mode including the intersections 26a and 26b between the folding lines of the folding members 3a and 3b and the lower end edge of the heat-sealed portion of the strip-shaped member 10 (that is, the inclined upper end edge of the reinforcing heat-sealing portions 27a'and 27b' Passing above the intersection of the folding lines of the left and right folding members 3a and 3b and the lower end edge of the heat-sealed portion of the strip-shaped member 10, and the inclined lower end edges of the reinforcing heat-sealing portions 27a'and 27b' are left and right. It is also possible to change to an installation mode in which each folding line of the folding members 3a and 3b of the above is passed below the intersection of the folding line and the lower end edge of the heat-sealed portion of the strip-shaped member 10).

Similarly to the gusset bag body 51 of FIG. 12, the gusset bag body 61 configured as described above also has the heat seals of the strip-shaped member 10 and the left and right folding members 3a, 3b by the reinforcing heat seal portions 27a', 27b'. The heat-sealing strength of the portion is increased, and the pressure of the contents generated at the time of dropping is less likely to concentrate on the heat-sealing portion between the band-shaped member 10 and the left and right folding members 3a and 3b, and the sealing strength is good. Even if it is dropped, the bag will not be broken and the contents will not be leaked. Further, the gusset bag body 61 has a lower end edge in which the reinforcing heat seal portions 27a'and 27b' are inclined downward from the center side to the outside, as in the gusset bag body 51 of FIG. It is difficult for the contents to remain between the folds when taking out (pouring).

Since the gusset bag body of the present invention exerts an excellent effect as described above, it can be used as a member or material for fixing a spout to form a gusset bag with a spout, or (as is) a food, a drug, or the like. It can be suitably used as a packaging bag for various liquids such as cosmetics and detergents and powders.

1,1', 31,51,61 ... Gazette bag body 2a, 2b ... Body material 3a, 3b ... Folding material 9 ... Opening 10 ... Band-shaped member 11 ... Spout 21,21', 41 ...・ Gazette bag with spout 30 ・ ・ Extraction port forming part

Claims (3)

It is a gusset bag body that is formed by a synthetic resin sheet into a bag shape with gussets on both the left and right sides, and has an opening for inserting and fixing a synthetic resin spout.
The gussets on both the left and right sides are formed by sandwiching the folded material folded in half on the left and right sides of the body material on the front and back, respectively, and the openings are provided in the upper corners on either the left or right side.
The height position at the upper end of the left and right folding materials is lower than the height position of the upper edge of the front and back body materials, and the upper end of the left and right folding materials is made of synthetic resin and has a constant width. It is heat-sealed on the back side of the body material on the front and back by the band-shaped member.
Below each heat-sealed portion of the band-shaped member and the left and right folding members, a certain-width band-shaped reinforcing member is formed by heat-sealing either the front or back body material on which the band-shaped member is heat-sealed and the left and right folding materials. The heat seal portion is provided so as to incline downward from the center side to the outside in an installation mode including the intersection of each folding line of the left and right folding materials and the lower end edge of the heat sealing portion of the strip-shaped member.
The inclined upper end edge of the reinforcing heat seal portion passes above the intersection of the folding line of the left and right folding materials and the lower end edge of the heat sealing portion of the strip-shaped member, and the reinforcing heat sealing portion is inclined. The lower end edge has passed below the intersection of the folding lines of the left and right folding materials and the lower end edge of the heat-sealed portion of the strip-shaped member, and
A gusset bag body characterized in that the inner edge of each reinforcing heat seal portion is located inside the folding line of each folding material at a position where it overlaps with the band-shaped member . A gusset bag formed by a synthetic resin sheet into a bag shape with gussets on both the left and right sides.
The gussets on both the left and right sides are formed by sandwiching the folded material folded in half on the left and right sides of the body material on the front and back, respectively.
The height position at the upper end of the left and right folding materials is lower than the height position at the upper end edge of the front and back body materials, and the upper end portion of the left and right folding materials is made of synthetic resin and is constant. It is heat-sealed on the back side of the body material on the front and back by a band-shaped member with a width, and yet
An extraction port forming portion for cutting to form an extraction port for the contents is formed above the upper ends of the left and right folding materials at at least one of the left and right corners of the upper part.
Below each heat-sealed portion of the band-shaped member and the left and right folding members, a certain-width band-shaped reinforcing member is formed by heat-sealing either the front or back body material on which the band-shaped member is heat-sealed and the left and right folding materials. The heat seal portion is provided so as to incline downward from the center side to the outside in an installation mode including the intersection of each folding line of the left and right folding materials and the lower end edge of the heat sealing portion of the strip-shaped member.
The inclined upper end edge of the reinforcing heat seal portion passes above the intersection of the folding line of the left and right folding materials and the lower end edge of the heat sealing portion of the strip-shaped member, and the reinforcing heat sealing portion is inclined. The lower end edge has passed below the intersection of the folding lines of the left and right folding materials and the lower end edge of the heat-sealed portion of the strip-shaped member, and
A gusset bag body characterized in that the inner edge of each reinforcing heat seal portion is located inside the folding line of each folding material at a position where it overlaps with the band-shaped member . The first or second aspect of the present invention, wherein the upper end portions of the left and right folding members are heat-sealed together on the back surface of either the front or back body material by a single strip-shaped member. Gazette bag body.

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