JP2672765B2 - Packaging bag, method for producing the same, and method for using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for packaging various products, products, articles, etc., a method for producing the same, and a method for using the same. It can be used for packaging foods.

[0002]

2. Description of the Related Art Conventionally, various kinds of packaging bags have been used when, for example, a person purchases a lunch box or other product and then takes it home. Such a packaging bag is used by a clerk to wrap a product when a product such as a bento is sold, or by a purchaser to wrap the purchased product by himself / herself. When wrapping a product, these clerk or purchaser takes an empty packaging bag, opens the entrance, and keeps the entrance open with one hand while using the other hand. Was put in the packaging bag, and then the posture of the product in the packaging bag was adjusted. For example, in the case of products that should be kept horizontal, such as bento,
The store clerk and the purchaser had to adjust the posture of the product horizontally in the packaging bag.

[0003]

However, in the packaging of such products, one hand holds the packaging bag so that the entrance can be opened, and the other hand adjusts the posture of the product in the packaging bag. However, it was time-consuming, and it was not suitable for the work of the store clerk, especially during the hours when the customers were concentrated. In particular, in the case of a synthetic resin packaging bag, the overlapping bag materials are attracted to each other due to static electricity, etc., and the opening operation for opening the entrance of the packaging bag itself is complicated and time-consuming. Made the above-mentioned work at times of congestion more difficult. In addition, in a general packaging bag, it is difficult to maintain the posture of the product in the packaging bag, and the posture of the product collapses on the way home.
Product value may be impaired. For example, if the bento box or the like is not kept horizontal, there is the inconvenience that the juice will flow out and the contents will be hard. On the other hand, a packaging bag that can hold the posture of the product constant during transportation and transportation (on the way of taking it home, etc.) is also used. However, in the case of such a packaging bag, although it is excellent in terms of maintaining the product posture during movement and transportation, it takes time to open the packaging bag itself, or when packaging the product, There is a problem in that it takes the time and effort described above.

An object of the present invention is to provide a packaging bag which can quickly and easily carry out opening and packaging of products and the like, and which is good in stability of products and the like when carried, a manufacturing method thereof and a method of using the same. Especially.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to achieve the above object by folding the side surface of a packaging bag into a characteristic state. Specifically, the packaging bag of the present invention,
As described in claim 1, a bottom surface portion having two opposite sides, and the bottom surface portion that is superposed on one surface side of the bottom surface portion.
A first side surface portion extending from each of the two opposite sides of the portion to near the middle portion of the bottom surface portion, and the bottom surface portion of the first side surface portion.
A second side surface portion which is overlapped on the opposite surface side and extends from the peripheral edge in the vicinity of the intermediate portion of each of the first side surface portions to the vicinity of the opposite two sides or the outside thereof , and the bottom surface portion in this state
And a surface facing the first side surface portion of the front of the first side surface portion
A surface facing the bottom surface portion and the first side of the second side surface portion
When the surface opposite to the surface constitutes a series of inner surfaces of the bag,
At the same time, the portions of the first side surface portions near both edges are joined to the bottom surface portion. Further, in the packaging bag of the present invention, as described in claim 2, a joint portion between both end edge vicinity portions of each of the first side surface portions and the bottom surface portion is formed obliquely with respect to the opposite two sides. In addition, the vicinity of the intermediate portion of both end edges of the bottom surface portion is cut out in a substantially semicircular shape. Further, the packaging bag of the present invention is characterized in that, as described in claim 3, a handle portion is provided on each of the second side surface portions.

Further, according to the method of manufacturing a packaging bag of the present invention, as described in claim 4, a bottom portion having two facing sides and folded in two so that the facing two sides are aligned, Forming a pair of side surface portions continuous with the bottom surface portion on two opposite sides, sandwiching the folded bottom surface portion between the respective side surface portions to form a four-sheet overlapping portion, and each side surface portion. Form a two-sheet overlapping portion by overlapping the part where the bottom surface portion is not sandwiched, of the four halves of the nearest half of the bottom surface portion near both end edges of each side surface portion of the overlapping portion. Then, the side surface portions are joined together, and then the side surface portions are bent at the boundary between the four-sheet overlapping portion and the two-sheet overlapping portion, and the bottom surface portion is spread out in a substantially flat plane to form two sets of three-sheet overlapping portions. It is characterized by forming a part. Furthermore, in the method for manufacturing a packaging bag of the present invention, as described in claim 5, the side surface portion and the bottom surface portion are joined by a joint portion formed obliquely with respect to the opposite two sides. Before forming the three-sheet overlapping portion, the outer portion of the joint portion is cut, and the vicinity of the intermediate portion of both end edges of the bottom surface portion is punched out into a substantially semicircular shape. The method of using the packaging bag of the present invention is the method of claim 6.
As described in, the packaging bag is
Note that each second side surface portion is arranged so as to face upward, the article to be packaged is placed so as to straddle both of the second side surface portions from above each second side surface portion, and then each second The packaged article is packaged by pulling the side surface portions in a direction in which they are separated from each other and extracting the second side surface portions from immediately below the packaged article.

[0007]

In the present invention as described above, the folded state (use
The packaging bag in a (before use) state is as described in claim 1.
The bottom part, the pair of first side parts, and the pair of second side parts overlap.
It is flat in the open state. And the above in this state
A surface of the bottom surface portion facing the first side surface portion, and the first side surface
And a surface of the second side surface part facing the bottom surface part.
The surface opposite to the first side surface part is a series of surfaces,
When these surfaces are in use (first side and second side are bottom
The inside surface of the bag can be configured to stand up against the surface).
And In other words, in the folded packaging bag,
One side is the outer side of the bottom bag, and the other side is the second side
The inside of the bag is exposed. Of the present invention
When packing the item to be packed in the packaging bag, use the bottom of the packaging bag.
Place it on the table or the like with the bottom side facing down and open the gap between the folds of each second side surface portion and each first side surface portion that appear on the upper surface by separating each second side surface portion from each other, and wrap it here. The entrance of the bag . At this time, as described in claim 6, the article to be packaged is placed so as to straddle both the second side surface portions and the second side surface portions, and then the second side surface portions are separated from each other. By pulling the second side surface portion directly below the packaged item by pulling it in the direction of the arrow, the packaged item automatically enters the packaging bag and is packaged. By packaging the items to be packaged in this way, the items to be packaged are automatically arranged in parallel on the bottom portion and packaged.Therefore, it is not necessary to arrange the posture of the items to be packaged in the packaging bag. Instead, there is no need for the labor-intensive work of opening the entrance of the packaging bag with one hand and inserting the item to be packaged into the packaging bag with the other hand, and then adjusting the posture as in the conventional case. . For this reason, the packaging work of the store clerk or the like can be facilitated particularly during the time when the customers are concentrated, which is advantageous.

Further, since the articles to be packaged are arranged in parallel on the bottom surface portion, the stability of the articles to be packaged when carrying is improved. For this reason, it is possible to safely carry a product, such as a bento, which should be kept horizontal, if the posture of the product is compromised. Furthermore, since the packaging bag is stored, transported, etc. in a state where the three overlapping portions are formed, it does not become bulky and is easy to handle.

Further, since each first side surface portion and each second side surface portion stand up clearly with respect to the bottom surface portion with the opposing two sides as a boundary when the packaging bag is in use, each first side surface portion Alternatively, by printing on the surface of each second side surface portion, particularly the surface of each first side surface portion, the printed surface can be seen clearly and a good advertising effect can be exhibited. The shape of the packaging bag in use is excellent in fashionability, and the advertising effect is exhibited also in this respect.

Further, as described in claim 2, the portions near the both end edges of each first side surface portion and the bottom surface portion are obliquely joined to the opposite two sides, so that both end edge portions of the bottom surface portion are near. Since the part forms a part of the side surfaces on both end sides of the packaging bag, this further improves the fashionability of the packaging bag and stabilizes the shape of the packaging bag in the used state. The stability when carrying the packaged product is further improved. Further, by cutting out the vicinity of the middle portion of both end edges of the bottom face portion in a substantially semicircular shape, the opening property of the packaging bag becomes good, and the strength of this portion is secured. Then, at this time, the ends of the joints between the bottom edge portions and the portions in the vicinity of both end edges of each first side face portion are also cut out at the same time, so that the end portions of the joints have a good finish. Furthermore, due to this notch, the bulkiness of this portion is prevented, and the stackability of the packaging bags is improved,
It is convenient for storage and transportation.

Further, as described in claim 3, by providing a handle portion on each second side surface portion, it becomes easy to carry the packaging bag with the article to be packaged inside. ,
By using this handle portion to form the inlet even during the packaging of the article to be packaged, the packaging work becomes easier.

Further, in manufacturing the packaging bag, as described in claim 4 or claim 5, after forming the four-sheet overlapping portion and the two-sheet overlapping portion, prior to forming the three-sheet overlapping portion. When cutting the outer portion of the joint between the bottom surface portion and the vicinity of both end edges of each first side surface portion and punching out the vicinity of the middle portion of both end edges of the bottom surface portion into a substantially semi-circular shape, these cutting operations Since the punching work and the punching work can be performed in a state where the respective parts are overlapped with each other, the manufacturing of the packaging bag is facilitated. Then, the handle portion can be easily formed by punching out the two-sheet overlapping portion. As described above, the above object is achieved.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a packaging bag according to this embodiment.
10 is shown. 1A is a plan view, FIG. 1B is a cross-sectional view as seen from the X direction in the previous figure, and FIG. 2 is a bottom view. 1 and 2, a packaging bag 10 is formed of a plastic film and has a bottom surface portion 11 having a substantially hexagonal shape (shape like a turtle shell) and two opposite sides of the bottom surface portion 11.
A pair of side surface parts 2 formed continuously with the bottom surface part 11 by 12, 13
It has 0 and 21. Each side surface portion 20, 21 is folded in half into a first side surface portion 20A, 21A and a second side surface portion 20B, 21B at an intermediate portion thereof.
It is 22, 23.

The bottom portion 11 can be folded in two along a center line 14 so that the two opposite sides 12 and 13 are aligned, and both sides thereof are substantially trapezoidal bottom portions 11A and 11B which are symmetrical to each other. Each of the first side surface portions 20A, 21A has the same trapezoidal shape as that of each of the bottom surface portions 11A, 11B. And each first side surface portion 20A, 21A
Extends from each of the two opposite sides 12 and 13 to a substantially central position of the bottom surface portion 11 and has a width approximately half the width H of the bottom surface portion 11.
Each of the second side surface parts 20B, 21B has a substantially rectangular shape.
Each second side surface portion 20B, 21B extends from a substantially central position (folding lines 22, 23) of the bottom surface portion 11 to a position in the vicinity of each of the opposing two sides 12, 13 and its width D is the width of the bottom surface portion 11. The width is slightly smaller than half of H.

Both end edges of each bottom surface portion 11A, 11B are welded to both end edges of each first side surface portion 20A, 21A by heat sealing, and welded portions 30, 31, 32, 33 are formed here. ing. These welded parts 30 to 33 are located at the center line 14 of the bottom part 11.
, That is, the angle A in the figure with respect to each of the two opposite sides 12 and 13.
It is formed diagonally to form the angle A
Is between 30 and 45 degrees. Each of the second side surface portions 20B, 21B is provided with a curved elliptic handle portion 40, 41 penetrating them. The edges 24, 25 and both edges 26, 27, 28, 29 of each second side surface portion 20B, 21B are not constrained with respect to the other parts of the packaging bag 10 and can be freely moved. There is.

Notches 50 and 51 are formed near both ends of the center line 14 of the bottom surface portion 11 so as to extend over both adjacent corner portions of the bottom surface portions 11A and 11B. Notches 50 and 51 are shown in Figure 1.
In the plan view of (A), it is formed so as to be punched out in a substantially semicircular shape when viewed from above the paper surface, and each first side surface portion 20
It is also formed so as to straddle the adjacent corners of A, 21A and the respective second side surface parts 20B, 21B.

FIG. 3 shows a state in which the bag 70 for packaging is opened and the article 70 (two-dot chain line in the figure) is packaged. The inlet 15 of the packaging bag 10 is formed between the folding lines 22 and 23 of FIG. 1 when the respective second side surface portions 20B and 21B are pulled in the direction in which they are separated from each other. In the state where the packaging bag 10 is used as shown in FIG. 3, a substantially triangular portion 16 sandwiched between the welded portion 30 and the welded portion 32 in the vicinity of both end edges of the bottom surface portion 11, a welded portion 31, and a welded portion 33 are formed. The substantially triangular portion 17 sandwiched by is in a state of standing up from the other remaining portion of the bottom surface portion 11 and forms a part of side surfaces on both end sides of the packaging bag 10.

An example of a method of manufacturing the packaging bag 10 will be described below. First, as shown in FIG. 4, the bottom surface portion 11 folded in half along the center line 14 is sandwiched between the first side surface portions 20A, 21A to form the four-sheet overlapping portion K, and the second side surface portions are formed.
20B and 21B are overlapped to form a two-sheet overlapping portion L. At this time, the bottom surface portions 11A, 11B and the first side surface portions 20A, 21A have a substantially rectangular shape and have not yet been in the predetermined shape described above. Next, in the four-sheet overlapping section K, each bottom surface section 11A, 11
The vicinity of both end edges of B and the vicinity of both end edges of each first side surface portion 20A, 21A are obliquely welded and joined to form each welded portion 30-33. Then, after welding and joining, the substantially triangular portion (the hatched portion in FIG. 4) outside each of the welded portions 30 to 33 is cut. Further, after cutting the substantially triangular portion, notches 50 and 51 are formed by punching out in the vicinity of both ends of the boundary line (the one-dot chain line in FIG. 4) between the four-sheet overlapping portion K and the two-sheet overlapping portion L in a substantially semicircular shape. At this time, the center line of the bottom part 11
Die at the same time with the areas near both ends of 14 overlapping. Further, in the two-sheet overlapping portion L, the second side surface portions 20B, 21B are piled up at the same time and punched out at the same time to form the handle portions 40, 41. After that, as shown in FIG. 5 (A) to FIG. 5 (B), the side lines 20, 21 are folded in two and the two-dot chain line in FIG. By expanding the bottom surface part 11 that is formed into a substantially one-plane shape, the two bottom surface parts 11A and 11B, the first side surface parts 20A and 21A, and the second side surface parts 20B and 21B are overlapped in this order. A sheet overlapping portion M is formed.

An example of how to use the packaging bag 10 will be described below. As shown in FIG. 6, the packaged product (commodity such as bento) 70 is folded back from above each of the second side surfaces 20B, 21B of the packaging bag 10 in which two sets of three overlapping portions M are formed. Place it so that it straddles lines 22 and 23. After that, pull each of the second side surface portions 20B, 21B in the directions separated from each other (directions E and F in the figure),
Each second side surface portion 20B, 21B is pulled out immediately below the article to be packaged 70. Then, remove the extracted second side parts 20B, 21B from the bottom part.
It stands up to 11 and puts the handle parts 40 and 41 together to obtain the state shown in FIG.

According to this embodiment, the following effects are obtained. That is, as shown in FIG.
70 is placed on each second side surface portion 20B, 21B and the second side surface portion 20B, 21B is pulled in the direction in which they are separated from each other. Since the work of packing the packaged product 70 can be performed instantaneously, a clerk or the like can perform the packing work extremely efficiently and smoothly during a time zone when the customer is concentrated. Further, since the packaged item 70 is automatically arranged in parallel on the bottom surface portion 11 and packaged by the method shown in FIG. 6, it is not necessary to adjust the posture of the packaged item 70 in the packaging bag 10. , It is possible to eliminate the trouble of opening the entrance of the packaging bag with one hand and inserting the article to be packaged into the packaging bag with the other hand and adjusting the posture as in the conventional case. .

Further, since the article to be packaged 70 is arranged in parallel on the bottom surface portion 11, the stability of the article to be packaged 70 when carried can be improved. For this reason, it is possible to carry with confidence a product that may lose its commercial value if its posture collapses, for example, a product that should be kept horizontal, such as a lunch box. Furthermore, the packaging bag 10 is shown in FIG.
Since storage, transportation and the like are performed in the state where the three-sheet overlapping portion M is formed, it does not become bulky and can be easily handled.

Further, the first side surface portions 20A, 21A and the second side surface portions 20B, 21B clearly stand up against the bottom surface portion 11 with the opposing two sides 12, 13 as boundaries in the use state of FIG. Therefore, each first side surface portion 20A, 21A or each second side surface portion 20B,
By printing on the surface of 21B, especially on the surface of each first side surface portion 20A, 21A, the printed surface can be seen clearly and a good advertising effect can be exhibited. The shape in the use state of FIG. 3 is excellent in fashionability, and the advertising effect can be exhibited in this respect as well. Further, since the welded portions 30 to 33 are formed obliquely with respect to the opposite two sides 12 and 13, in the use state of FIG. 3, a substantially triangular portion 16 sandwiched between the welded portion 30 and the welded portion 32 is used. And a substantially triangular portion 17 sandwiched by the welded portion 31 and the welded portion 33.
However, because it forms a part of the side surfaces on both end sides of the packaging bag 10,
As a result, the fashionability of the packaging bag 10 can be further improved, and the shape of the packaging bag 10 in a used state is stable, so that the stability of the packaged item 70 when it is carried can be further improved.

Further, since the notches 50 and 51 are formed in the vicinity of both ends of the center line 14 of the bottom surface portion 11, the opening property of the packaging bag 10 can be improved, and this portion can be improved. In addition, the strength of the welded portions 30 to 33 can be improved, and the end portions of the welded portions 30 to 33 on the side of the center line 14 are also punched when the notches 50 and 51 are formed, so that these end portions can have a good finish. And
By forming the notches 50 and 51, the bulkiness of this portion can be prevented, so that the stacking property of the packaging bag 10 can be improved, which is convenient for storage, transportation and the like.

Further, since the grips 40 and 41 are provided, the packaging bag 10 can be easily carried with the packaged item 70 inside, and at the time of packaging the packaged item 70. Also attach these grips 40, 41 to the second side 20B, 21
It can be used for pulling B in the E and F directions in FIG. 6, and packaging work can be performed more easily.

The present invention is not limited to the above-described embodiments, but includes other configurations that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention. That is, in the above embodiment, each first side surface portion
20A and 21A extend from the two opposite sides 12 and 13 to approximately the center of the bottom surface portion 11, but do not need to extend to approximately the center, and in short, extend to the vicinity of the middle portion of the bottom surface portion 11. Just do it. That is, a gap may be formed between the folding lines 22 and 23 in the state of FIGS. 1A and 1B (state before use). In addition, each of the second side surface portions 20B, 21B of the above-described embodiment extends to the vicinity of each of the opposite two sides 12, 13, but at least as wide as shown in FIG. May be provided, or the width may be longer than that in the above-mentioned embodiment beyond the two opposite sides 12 and 13.

Further, in the above embodiment, each bottom surface portion 11A, 11
Joining of both end edges of B and both end edges of each first side surface portion 20A, 21A is performed by heat-sealing the welded portions 30, 31, 32,
However, the joining method is not limited to such welding, and may be gluing or the like. The welded portions 30, 31, 32, and 33 are angled with respect to the center line 14 of the bottom surface portion 11, that is, with respect to the two opposite sides 12 and 13 by the angle A in FIG.
Although it is formed so as to be inclined, it does not necessarily have to be formed at an angle and may be formed at a right angle to each of the two opposite sides 12 and 13. However, it is preferable to set the angle A to 30 to 45 degrees in terms of strength, function and fashion. And, in the above-mentioned embodiment, each welding portion 30, 31, 32,
The substantially triangular portion outside 33 (the shaded portion in FIG. 4) is supposed to be cut, but it may be left without being cut. However, it is fashionable to cut it.

Further, although the handle portions 40 and 41 of the above-mentioned embodiment have a curved oval shape, the handle portion may have any shape, for example, an oval shape or a C shape. Furthermore, the grips 40, 41 may be omitted, and if the grips 40, 41 are not provided, for example, protrusions may be provided at the edges 24, 25 of the second side surfaces 20B, 21B. Good.

Further, in the above-mentioned embodiment, the bottom surface portion 11 has a substantially hexagonal shape (shape like a turtle shell), but has two opposing sides 12 and 13, and the welding portions 30, 31, 32, 33
The shape may be arbitrary as long as it can be formed. Along with this, the shapes of the first side surface portions 20A, 21A are also arbitrary.

Further, each of the second side surface portions 20B, 21B of the above embodiment
Has a substantially rectangular shape, but each second side surface portion 20B, 21
The edges 24, 25 and both edges 26, 27, 28, 29 of B are not constrained to the other parts of the packaging bag 10 and are freely movable, so these edges are not restricted. The shapes of 24, 25 and both end edges 26, 27, 28, 29 are arbitrary, and thus the shapes of the respective second side surface portions 20B, 21B are also arbitrary. For example, both edges 26,
27, 28, 29 are formed obliquely so as to substantially overlap with the welded portions 30, 31, 32, 33, and the second side surface portions 20B, 21B are respectively formed with the first side surface portions 20.
You may make it substantially the same shape as A and 21A.

Further, in the above-mentioned embodiment, the notches 50, 51 having a substantially semicircular shape are formed, but the notches may have any shape. The notches 50 and 51 may be omitted, but it is preferable to provide them in order to improve the openability and the strength.

Although the packaging bag 10 is formed of a plastic film in the above-mentioned embodiment, the packaging bag of the present invention may be made of any material, such as cloth or paper. The thickness of the packaging bag of the present invention is also arbitrary. In addition, in FIG. 1B, FIG. 5A, FIG.
Although the packaging bag 10 is drawn with a thickness, this is exaggerated for the sake of explanation.

Further, the manufacturing method and usage method of the packaging bag of the present invention are not limited to the manufacturing method and usage method described in the above embodiments, and, for example, in the manufacturing method,
The order of cutting the substantially triangular portion (hatched portion in FIG. 4) outside the welded portions 30, 31, 32, 33 and forming the notches 50, 51 may be reversed. Second side portion 20B,
21B may be pulled in the directions away from each other (directions E and F in FIG. 6) to open the inlet, and then the article to be packaged 70 may be put in the package and packaged. Furthermore, the packaging bag of the present invention has a take-away bento, a side dish, a Japanese and Western confectionery, a high-grade fruit, a pizza pie,
It can be used for packaging various products, products, articles and the like such as foods such as sashimi.

[0033]

As described above, according to the present invention, since the side surface of the packaging bag is formed by folding it into a characteristic state, the opening of the packaging bag and the packaging of products etc. can be carried out quickly and easily. In addition to being able to carry out, the packaged products etc. are arranged in parallel on the bottom part, so that the stability of the products etc. can be sufficiently ensured when they are carried, and since they are not bulky, they can be easily stored and transported. It has the effect of being able to perform advertising functions due to its fashionability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a bottom view of the embodiment.

FIG. 3 is a diagram showing a usage state of the embodiment.

FIG. 4 is an explanatory view of a manufacturing method of the above embodiment.

FIG. 5 is another explanatory view of the manufacturing method of the embodiment.

FIG. 6 is an explanatory diagram of a method of using the embodiment.

[Explanation of symbols]

 10 Packaging bag 11,11A, 11B Bottom part 12,13 Opposite two sides 20,21 Side part 20A, 21A First side part 20B, 21B Second side part 22,23 Folding line 30,31,32,33 Joint part Welded part 40,41 Handle part 50,51 Notch 70 Packaged item

Claims (6)

(57) [Claims] 1. A and a bottom portion having two opposite sides, the bottom
A first side surface portion that is overlapped on one surface side of the surface portion and extends from each of two opposing sides of the bottom surface portion to a vicinity of an intermediate portion of the bottom surface portion, and a surface of the first side surface portion opposite to the bottom surface portion.
And a second side surface portion that is overlapped with the first side surface portion and extends from a peripheral edge in the vicinity of the intermediate portion of each of the first side surface portions to the vicinity of the opposite two sides or the outside thereof, and the first side of the bottom surface portion in this state.
The surface facing the surface portion and the bottom surface portion of the first side surface portion are paired.
The facing surface is opposite to the first side surface portion of the second side surface portion.
A packaging bag , wherein the side surface constitutes a series of inner side surfaces of the bag, and portions of the first side surface portions in the vicinity of both end edges are joined to the bottom surface portion. 2. The packaging bag according to claim 1, wherein
The joint between the bottom edge portion of each of the first side surface portions and the bottom surface portion is formed obliquely with respect to the opposite two sides, and the vicinity of the intermediate portion of both end edges of the bottom surface portion is cut into a substantially semicircular shape. A packaging bag characterized by being omitted. 3. The packaging bag according to claim 1 or 2, wherein each second side surface portion is provided with a handle portion. 4. A bottom part having two opposite sides and folded in two so that the two opposite sides are aligned, and a pair of side parts continuous with the bottom part on the two opposite sides, respectively.
The two-folded bottom surface portion is sandwiched between the respective side surface portions to form a four-sheet overlapping portion, and a portion of each side surface portion where the bottom surface portion is not sandwiched is overlapped to form a two-sheet overlapping portion. , The four-sided overlapped portions of each side surface portion near both end edges are respectively joined to the two half-folded portions of the nearest half-end edge vicinity portions, respectively, and then each side surface portion is overlapped by four sheets. A method for manufacturing a packaging bag, comprising bending at a boundary between a portion and the two-sheet overlapping portion and expanding the bottom portion into a substantially one-plane shape to form two sets of three-sheet overlapping portions. 5. The method for manufacturing a packaging bag according to claim 4, wherein the side surface portion and the bottom surface portion are joined by a joining portion formed obliquely with respect to the opposite two sides. A method for manufacturing a packaging bag, characterized in that, before forming the sheet overlapping portion, the outer portion of the joining portion is cut and the vicinity of the intermediate portion of both end edges of the bottom surface portion is punched out into a substantially semicircular shape. 6. A method of using the packaging bag according to claim 1 , wherein the bottom surface of the packaging bag is
Arranged so that each of the second side surface is oriented downward, the packaged article is placed so as to straddle both of the second side surface parts from above each of the second side surface parts, and then each of the above A method of using a packaging bag, which comprises packaging the article to be packaged by pulling the second side surface portions in a direction in which they are separated from each other and extracting each of the second side surface portions from directly below the article to be packaged.