JP2699243B2 - Handbag and manufacturing method of handbag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic bag. The present invention relates to a handbag that can be stored in a state of being folded into a rectangle and that forms a rectangular parallelepiped bag when used.

[0002]

2. Description of the Related Art Plastic handbags are very widely used because of their simplicity, and this manufacturing industry forms an enormous market. As one of these plastic handbags,
A very distinctive plastic handbag is found in Japanese Patent Publication No. 52-3
No. 9342. In this bag, the handbag is folded at the top edge of the bag first,
There is a feature in that this handle can be pulled out and used. One of the bags proposed here is one in which a handheld film 4 is folded inside the opening 2 and attached as shown in FIG. In addition, the plastic handbag proposed in the above-mentioned patent publication has a square bottom shape,
A gusset fold is formed on this bottom, and a square bottom can be formed by a known method. That is, when a gusset fold is provided at the bottom, and four 45-degree inclined bottom fusion lines are provided at the lower corners of the front and back of the gusset fold and at the four left and right sides to form a square bottom, the bag body part becomes a rectangular parallelepiped shape, For example, papers of a certain size such as a box or a newspaper can be stacked and stored. As described above, when the volume of the storage section is increased due to the square bottom, the shape of the bag body section is changed to that of the conventional FIG.
Instead of the flat shape as shown in FIG. In the case as shown in FIG. 9, the portion of the opening side edge A at the upper edge of the lateral side wall N of the bag body portion is bent into a wavy shape L when it is hung, and the distance between the hand-held fusion wires 5 is narrow. The angle of the hand-held part film when it is hung and suspended is relatively vertical, and
The fusion wire 5 suspends the gravity of the bag in the vertical direction. However, the rectangular parallelepiped bag body portion is suspended in a shape as shown in FIG. 10, and the length of the hand-held film fixed by the left and right hand-welding lines 5 and 5 and the left and right of the upper edge of the lateral side wall N. The distance between the hand-held fusion lines 5, 5 is the same. Therefore, it is necessary that the upper edge of the side wall N bends as much as the hand-holding film projects above the upper edge of the bag body as shown in FIG. However, when, for example, newspaper magazines are stacked and stored near the edge of the opening in the bag body portion, the opening edge of the side wall N can be bent toward the center, but there is room for wrinkles as shown in FIG. Is reduced. Therefore, when the tape portion of this bag is suspended, the tape becomes nearly horizontal, and when the angle of the film portion with respect to the horizontal direction is α, [1 / s of the gravity of the bag body portion is obtained.
[inα] times the tension, the force is applied to the handheld film and the fusion wire 5 thereof, and the film is easily broken. In particular, there is a disadvantage that the gravity is unevenly distributed at both ends of the fusion wire 5 and the wire is broken.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a plastic handbag having a rectangular parallelepiped bag body with a square bottom and having high strength when suspended.

[0004]

SUMMARY OF THE INVENTION The inventor of the present invention puts a heavy object into a square-bottomed handbag bag having a handheld portion fused to the upper edge of a lateral side wall N as in the prior art, and suspends the baggage to gradually increase the number of stored items. Then, it was observed that a force was locally applied to the tip of the hatched fusion part between the hand part film and the opening edge of the hand part, and the film was torn from the tip of the fusion part. In this handbag, since the tape of the handbag is formed by bending the opening edge, when this is fixed by the fusion wire 5, the distance between the left and right fusion wires 5 is equal to the length of the handbag film. I do. Therefore, as shown in FIG. 10, when the handhold is located on the side edge of the opening edge, the length between the fusion lines 5 at the opening edge and the length of the handhold film are the same. In order for the hand-held portion film 4 to rise above the opening edge as shown in FIG. 10 when the hand-held portion is hung, it is necessary to shorten the interval between the left and right hand-held fusion lines 5, 5 due to wrinkles at the opening edge. .

However, when the bag is a rectangular parallelepiped and the contents are packed up to the top of the bag, the opening has a limited room for bending depending on the contents. In addition, the force applied to the bent side surface is distorted, and an uneven force is applied locally to the opening edge and the hand-held fusion line 5, particularly at the distal end thereof, so that it is easily broken. Therefore, in order to eliminate the force concentrated on the tip of the fused portion, if the hand-held film is made to protrude from the vertical side wall M of the bag body portion, as shown in FIGS. However, when the upper edge of the vertical side wall M is drawn to incline the opening edge toward the inside of the bag body portion, the hand-held portion film is suspended as shown in FIG. , Uniform force. In this manner, the attachment of the hand strap to the upper edge of the vertical side wall M can be achieved by providing the hand strap fusion line outside the corner bottom fusion wire.

That is, the present invention consists of the following items. (1) A step of continuously supplying a long tubular thermoplastic film, and providing gusset folds at the top and bottom of the tube, and then folding the continuously supplied gusset into a lower gusset. Square bottom fusion line traversing the gusset fold at an angle of approximately 45 degrees from the bottom edge toward the side edge of the bag at positions corresponding to the left and right ends of the bottom of the bag of the folded portion on the front side and the back side of the portion 18 is performed by pressing a heat iron in the shape of the fusion wire from the upper and lower surfaces of the gusset at regular intervals against a patch plate inserted into the gusset, and simultaneously or simultaneously with the square bottom fusion wire construction process. At the front and back, when providing a hand-welding fusion line 5 which spreads at an angle of about 45 degrees from the upper gusset folded upper edge to the bag body side edge in each of the front and back folded portions of the upper gusset folded portion, Fusion As compared with the position of the intersection point 11 between the line and the bottom edge, the intersection point 12 between the hand-fused line and the upper edge of the casset is located directly above or outside when viewed from the center equivalent of the bag body. The step of forming a hand-held fusion line by pressing a hot iron in the form of a hand-held fusion line from the upper and lower surfaces of the upper gusset-fold at regular intervals of the upper gusset-fold against a backing plate inserted into the gusset, and A method for manufacturing a handbag, comprising: performing a step of separating the handbag from the opening edge; and finally, fusing a position corresponding to the side edge of the bag body with a hot blade. (2) The method for manufacturing a handbag according to (1), wherein the lower end of the handbag fusion line is continued to the side edge fusion part.

(3) A step of continuously supplying a long tube-shaped thermoplastic plastic film and providing gusset folds on the upper and lower sides of the tube is performed, and then the inner central fold of the upper gusset fold is continuously formed. After performing the cutting step or before the cutting step, it corresponds to the left and right ends of the bottom of the bag body of the folded part on the front and back sides of the lower gusset folded part of the continuously supplied gusset folded raw material. At a position where the gusset folded portion crosses at an angle of approximately 45 degrees from the bottom edge toward the bag body side edge,
Performing a step of pressing the heat iron in the shape of the fusion wire from the upper and lower surfaces of the gusset to the slab inserted into the gusset at regular intervals to form, and simultaneously with or before and after the square bottom fusion wire construction process, When providing a hand-held fusion line 5 extending at an inclination of approximately 45 degrees from the upper edge of the upper gusset fold toward the side edge of the bag body at each of the folded portions on the front side and the back side of the upper gusset fold portion, a square bottom fusion line at the bottom is provided. In comparison with the position of the intersection point 11 between the bottom edge and the bottom edge, the intersection point 12 between the hand fusion line and the upper edge of the casset is located directly above or outside when viewed from the center equivalent of the bag body, At regular intervals of the upper gusset fold, a hot iron in the form of a hand-held fusion line is pressed from the upper and lower surfaces of the upper gusset fold against a backing plate inserted into the gusset to form a hand-weld fusion line, and then the upper gusset fold is cut off. And open the handbag It performs a process of separating from the end, the production method of the tote bag, characterized in that a step of Torudan a position corresponding to the bag portion side edge with hot blade. (4) The method for manufacturing a handbag according to item 3, wherein the lower end of the handbag fusion line is continued to the side edge fusion part.

(5) A box-shaped bag body comprising two lateral side films N, two vertical side wall films M and a bottom film, and one hand-holding film. A square-bottom fusion line 18 having a side edge fusion part 6 and extending from both sides of the bottom film to both vertical side walls M so as to protrude to the vertical side walls and inclined to the vertical side walls at approximately 45 degrees. Then, it is fused and fixed to the inside of the vertical side wall M by a square bottom fusion line 18 which crosses the side edge 6 at a substantially vertical angle. Also, one handpiece film is separated at the center and two right and left handpiece films are provided. Hand-fusing line 5 which is formed as a film and has the end of the hand-holding portion film inclined at approximately 45 degrees, and the tip end A of the hand-fusing line 5 is bent in the horizontal direction. 5 and fixed to the upper portion of the vertical side wall by a distance D of 1/8 to 1/3 of the width of the vertical side wall film M.
However, the outer edge of the hand-held film is set inside the upper edge of the vertical side wall film M, and the length of the hand-held film is twice as long as the distance D than the side wall film N. And put the bottom film in the bag,
A handbag that can be folded into a flat rectangular shape by folding the side edge fused portion 6 of the vertical side wall M on both sides and pulling it right and left.

The present invention will be described in detail with reference to the drawings of embodiments. In the plastic handbag shown in the plan view of FIG. 1 and the sectional view of FIG. 2, the two rectangular films on the front and back are formed of one plastic film integrally connected via the bottom 3. The left and right side edges are fused by the side edge fusion line 6 to form the bag 1. As the shape of the bag of the present invention, not only a horizontally long rectangle but also a vertically long rectangle and a square shape can be used as viewed from the side. As shown in FIG. 2, a handhold film 4 is provided inside the opening film 13 on both front and back surfaces.

[0010] The bag according to the present invention has a square bottom at the bottom. That is, the gusset fold is also applied to the bottom 3 in FIG.
As shown in the figure, the cross-section is made into a W-shape, and two pairs of opposite films of a bottom inner film 15 and a bottom outer film 16 are respectively provided on the front and back at four corner bottom fusion lines 18 on the front and back. If they are separately fused and fixed, the bottom 3 of the bag body can be formed into a square bottom shape. Square bottom fusion line 18
Is provided in a straight line inclined at approximately 45 degrees between the intersection of the inner fold 17 of the bottom gusset fold and the side edge 6 and the intersection 11 at a distance of the height C of the gusset fold from the end of the bottom edge. Is desirable. When the upper end of the square bottom fusion line 18 approaches the side edge portion 6, it is preferable to bend in a horizontal direction as shown in FIG. 1 so as to intersect the side edge fusion portion almost perpendicularly. With this horizontal curved shape, the strength of the corner bottom can be improved and the corner bottom fusion step in manufacturing can be facilitated. In the embodiment of FIG. 1, the opening film 13 and the opposite hand-held film 4 are opposed to each other at the four hand-welding lines 5 extending downward on the left, right, front and back of the upper opening film 13. Are fused and fixed.

[0011] The angle of the hand-held fusion line 5 is approximately 45 degrees. According to the weight of the bag, the length of the hand-held fusion wire 5 can be increased. For that purpose, it is necessary to increase the vertical width of the handhold film 4. The front end portion A of the hand-held fusion line 5 of the bag of the present invention is bent in the horizontal direction, and the gravity concentrated there is dispersed on the line of the front end portion A which is bent in the horizontal direction. Become. In the present embodiment, the tip of the hand-held fusion wire 5 is extended horizontally so as to reach the side edge fusion part. Intersection 11 with the lower edge of the square bottom fusion line 18
The distance from the end of the side edge is approximately the same as the height C of the gusset fold. The intersection 12 between the hand-held fusion line 5 and the upper edge is
When viewed from the center, it is located outside by a distance D from the position immediately above the intersection 11 between the corner bottom fusion line and the lower edge. In the present invention, the distance D can be appropriately selected within a range of approximately 0 to 2 / 3C with respect to the length of C. The distance D is set to 1/8 or more of the vertical side wall M as shown in FIG. Can be 2D longer.

As shown in FIG. 1, when a bag manufactured by stacking films in a plane is three-dimensionally expanded for use, FIG.
State. As shown in FIG. 4, the dimension of this three-dimensional shape is such that the length of the side wall N is the length of B in FIG.
Is twice the height C of the gusset fold, and the height of the bag body is the distance between the upper edge and the lower edge of FIG. And intersection 1
1 and the distance D of the difference in length from the end of the intersection 12 corresponds to the distance from the end of the upper edge of the vertical side wall of the handhold film. The hand film is longer than the distance between the two vertical side walls M by the distance D, which allows the hand film to rise above the bag. When the vertical side wall M is slightly inclined inward when the user holds the hand-held film,
There is room in the handpiece film, making it easier to suspend.

The center portion of the hand-holding film of the bag having the three-dimensional shape shown in FIG. 4 is folded and pushed into the bag body, and the center portion of the bottom portion is also folded and pushed in. By folding the line of the edge fusion portion 6 and pulling it to the left and right, it can be restored to the planar rectangular shape at the time of manufacture of FIG. The bag of the present invention is characterized in that it can be folded flat when stored. In the conventional handbag, the handbag fusion line 5 is provided inside the lower corner bottom fusion line 18, and when the bag is suspended, the handbag film is formed by the side wall of the bag body as shown in FIG. N
, And is suspended in the form shown in FIG. In this case, wrinkles are formed on the upper edge of the side wall N, and the distance becomes a margin of the handhold film. However, the force applied to the fusion line 5 is irregular and complicated, and gravity is applied to the fusion line tip. Be unevenly distributed. In the present embodiment, as shown in FIG. 1, the intersection 12 between the hand fusion line and the upper edge is located outside the intersection 11 between the lower corner bottom fusion line 18 and the lower edge.

In this way, as shown in FIG. 4, the bag body can be hung by the handpiece extending from the upper edge of the rectangular parallelepiped vertical side wall M. Then, the wide hand holding film 4 is attached so as to cross the bag body in the vertical direction as shown in FIG. When hanging the bag body with such a handbag film, the handbag pulls the upper edge of the vertical side wall M of the bag body. in this case,
The length of the handhold film is greater than the length of the side wall N, as shown in FIG.
, And the upper edge of the vertical side wall M is slightly inclined toward the bag body portion due to the tension at the time of suspension, and the upper edges of the vertical side walls M on both sides move inward, and the distance corresponds to the distance. Is sufficient to allow the hand-held portion film to protrude upward, and is suspended in the shape shown in FIG. In this case, since the tension of the hand-held portion hangs vertically to the upper edge of the vertical side wall M, no wrinkles are generated on the vertical side wall where the hand-held fusion line 5 exists, and the tension is not unevenly distributed. . Also,
When the center of the wide hand-held film 4 is squeezed, the tension at both side edges of the hand-held film is increased and acts to lift the end of the bag body, so that the suspended state is stabilized.

Even if a bag having a rectangular parallelepiped shape is stored in a box shape or a standard shape bag like an old newspaper is stacked near the upper portion of the bag body, the upper edge of the vertical side wall cannot be slanted inward. Since it is present, the angle of the hand film is vertical, not so large, and the damage of the hand film fusion line 5 does not occur. As another mode of the present invention, in the handbag of the above embodiment, the intersection 12 between the handheld fusion line 5 and the upper edge is positioned almost directly above the lower end 11 of the square bottom fusion line 18. Then, a handbag having the shape shown in FIG. This handbag has an advantage in that the handbag film functions as a lid and can shield items inside.

Next, when it is difficult to store the goods in the handbag shown in FIG. 5, the handbag of the embodiment shown in FIG. 6 in which the center portion of the handbag film is cut vertically and two handbag films are used. can do. This handbag can be obtained by cutting the center fold of the handheld film 4 in FIG. Further, FIG.
In the embodiment of the present invention, when the width of the two hand films is reduced from both sides, a hand bag having two hand films as shown in FIG. 7 is obtained. This can be obtained by narrowing the width of the hand film of the hand bag shown in FIG. 5 and setting the distance D as shown in FIG. The handbag of this embodiment can be manufactured by a continuous bag making process as shown in FIG. First, from the left of FIG.
A long tube-shaped raw film having a cross section (a) is supplied to the gusset process while continuously being pulled out. In the gusset step, a gusset fold having a cross-sectional shape of (b) is provided at the upper and lower edges of the tubular film, and a W-shaped cross-sectional structure is formed vertically.

Next, the gusset-folded raw material is intermittently supplied to the fusing step, and a hot iron is inserted from above and below the gusset fold into a metal patch inserted between the upper and lower gusset folds. Then, the hand-welded fusion line and the square-bottom fusion line shown in FIG. This interval R is shown in FIG.
It is equivalent to the width of the folded state of the handbag as shown in FIG. In these steps, it is convenient to simultaneously carry out the construction of the hand fusion line and the square bottom fusion line of the next bag on the boundary line with the next bag. In this case, two square-bottom fusion lines which can be finally divided into the front and rear bags by one continuous heat iron can be constructed. 4 and FIG. 5, when the hand-held fusion line 5 is in contact with the side edge fusion portion 6, the construction of the hand-held fusion line is also performed by one continuous heat trowel for two bags. Can construct a continuous hand-welded fusion line. Furthermore, when the square bottom fusion line is continuous with the next bag parallel to the tip of the next bag, use a continuous shape with a convex curve so that a hot iron can be constructed simultaneously with the fusion of the next bag. Can be.

As shown in FIG. 1, the square bottom fusion line 18 is
When it is made to intersect at an almost perpendicular angle, the concentration of gravity is eliminated at the side edge where the square bottom fusion line intersects, and the fusion line that should come on the boundary line when fusing the side edge in the bag making process Even if there is some deviation, the shapes of the square bottom fusion lines of the left and right bags are the same, and it is desirable because the strength does not decrease even if there is an error in the fusion position. The raw material that has left the fusion step is then supplied to the upper edge cutting step. Here, cut the fold of the upper edge,
Separate the handbag film from the upper edge of the bag body. The cross section has the shape of (d). This cutting can be performed by inserting a blade into the upper edge to cut open the fold or cutting a little below the upper edge.

Alternatively, the central portion can be cut out near the intersection 12 with the upper edge of the hand-held fusion line 5 and cut off. When the cutting is performed by this notching method, an upper edge structure as shown in FIG. 11 is obtained. Next, when manufacturing the handbags shown in FIGS. 6 and 7, the center fold of the handbag film is cut in the center fold cutting step, and the cross section is formed into a shape (e) so that two handbags can be formed. . The center fold cutting step can be appropriately performed immediately after the gusset folding step or before and after the upper edge cutting step. As described above, the square bottom fusion line 1
Next, the long raw film on which the cutting line 8 and the hand-cutting cutting line 5 are constructed is melted on the boundary line by applying a hot blade to each bag width.
It is possible to obtain the handbag in a state where it is folded flat.

[0020]

The bag of the present invention has a rectangular parallelepiped bag portion and provides a durable handbag that can be folded and stored. The manufacturing method of the present invention is convenient for use. A rectangular parallelepiped shape that enables efficient and easy production of strong plastic handbags, and can be suitably used for old newspaper storage bags, box-shaped articles, and board-shaped articles. Useful as a handbag.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of a handbag according to the present invention.

FIG. 2 is a longitudinal sectional view of one embodiment of a handbag according to the present invention.

FIG. 3 is a cross-sectional view of a tube-like film provided with upper and lower gusset folds used in the manufacture of a handbag according to the present invention.

FIG. 4 is a perspective view showing a shape of the bag of the present invention when used.

FIG. 5 is a perspective view showing the shape of another embodiment of the bag according to the present invention when used.

FIG. 6 is a perspective view showing the shape of another embodiment of the handbag of the present invention when used.

FIG. 7 is a perspective view showing the shape of another embodiment of the bag according to the present invention when used.

FIG. 8 is an explanatory view showing the manufacturing method of the present invention.

FIG. 9 is a perspective view showing a shape when a known bag is used.

FIG. 10 is a perspective view showing a shape when a known bag is used.

FIG. 11 is a plan view of another embodiment of the present invention.

[Signs in the figure]

 DESCRIPTION OF SYMBOLS 1 Bag film 2 Opening 3 Bottom 4 Hand film 5 Hand fusion line 6 Side edge fusion part 7 Gazette fold 8 Gazette fold 9 Gazette fold 10 Gazette fold 11 Intersection between square bottom fusion line and lower edge 12 Hand Intersection between fusion line and upper edge 13 Opening film 15 Bottom inner film 16 Bottom outer film 17 Square bottom gusset fold 18 Square bottom fusion line A Hand fusion line tip curved portion B Square bottom fusion line curved portion C Width of bottom gusset D Distance of misalignment between intersections 11 and 12 M Vertical wall of bag body N Side wall of bag body R Width of handbag folded flat

Claims (5)

(57) [Claims] 1. A step of continuously supplying a long tubular thermoplastic film, providing gusset folds on the upper and lower sides of the tube, and then performing a step below the continuously supplied gusset folded material. Square bottom fusion that traverses the gusset fold at an angle of approximately 45 degrees from the bottom edge toward the side edge of the gusset at an angle of approximately 45 degrees at positions corresponding to the left and right ends of the bottom of the bag at the folded portion on the front and back sides of the gusset folded. A step of pressing the heat wire in the shape of the fusion wire 18 from the upper and lower surfaces of the gusset onto the backing plate inserted into the gusset at regular intervals is performed, and the wire 18 is formed simultaneously with the square bottom fusion wire construction process. Alternatively, before and after that, when providing a hand-welding fusion line 5 that spreads at an angle of approximately 45 degrees from the upper edge of the upper gusset fold toward the edge of the bag body on each of the folded portions on the front side and the back side of the upper gusset fold, Compared with the position of the intersection 11 between SokoToru Chakusen and the bottom edge, the intersection of the 該手 HisageToru Chakusen and Kazetto upper edge 1
2 is positioned directly above or outside of the bag when viewed from the center of the bag, and a heat trowel in the form of a hand-fused wire is gusseted from the upper and lower surfaces of the upper gusset at regular intervals of the upper gusset. A step of forming a hand-held fusion line by pressing against a backing plate inserted therein and a step of separating an upper gusset fold and separating a hand-held portion from an opening edge are performed, and finally correspond to a bag body side edge. A method for manufacturing a handbag, wherein a step of fusing the position with a hot blade is performed. 2. The method for manufacturing a handbag according to claim 1, wherein the lower end of the handbag fusion line is continued to the side edge fusion part. 3. A step of continuously supplying a long tube-shaped thermoplastic film and providing gusset folds at the top and bottom of the tube, and then continuously cutting the inner central fold of the upper gusset fold. After performing the step of performing, or before the cutting step, the front and back folded portions of the lower gusset folded portion of the continuously supplied gusset folded material correspond to the left and right ends of the bottom of the bag body of the folded portion. At a position, a square bottom fusion line 18 that crosses the gusset folded portion at an angle of approximately 45 degrees from the bottom edge toward the side edge of the bag body, and a heat iron in the shape of the fusion line is inserted into the gusset from the upper and lower surfaces of the gusset. Performing a process of pressing at regular intervals against the backing plate inserted into the gusset folded line, at the same time as or before and after the square bottom fusion line construction process, on the front and back folded portions of the upper gusset folded portion, When providing a hand-held fusion line 5 extending at an inclination of approximately 45 degrees from the upper edge of the gusset to the side of the bag body, compared with the position of the intersection point 11 between the square bottom fusion line at the bottom and the bottom edge, The point of intersection 12 between the fusion line and the upper edge of the gusset is located directly above or outside when viewed from the central portion of the bag body, and the upper gusset is folded from the upper and lower surfaces at regular intervals. A heat iron in the shape of a fusion line is pressed against the backing plate inserted into the gusset to form a hand fusion line, then the upper gusset fold is cut off, and a step of separating the handbag from the opening edge is performed. And a step of fusing a position corresponding to the side edge of the bag with a hot blade. 4. The method for manufacturing a handbag according to claim 3, wherein the lower end of the handbag fusion line is continued to the side edge fusion part. 5. A box-shaped bag body comprising two horizontal side wall films N, two vertical side wall films M and a bottom film.
And a side edge fusion portion 6 at the center of the vertical side wall M, and both vertical side walls M from both sides of the bottom film.
The end of the film extending in a convex shape is approximately 45
Angle welding line 18 inclined at an angle , and almost perpendicular to the side edge 6.
It is fused and fixed to the inside of the vertical side wall M by the square bottom fusion line 18 which intersects at a right angle, and one handpiece film is separated at the center to be two left and right handpiece films,
A hand fusion line 5 in which the end of the hand film is inclined at approximately 45 degrees, and the tip A of the hand fusion line 5 is bent in the horizontal direction.
It is fixed to the upper part of the vertical side wall by the bent hand-fused wire 5 ,
Only a distance D of 1/8 to 1/3 of the width of the vertical side film M,
A handbag in which the outer edge of the handbag portion film is set inside the upper edge of the vertical side wall film M, and the length of the handbag film is twice as long as the distance D than the side wall film N, and the handbag portion film and the bottom portion A handbag that can be folded into a flat rectangular shape when a film is put in a bag body and the side edge fusion parts 6 of the vertical side walls M on both sides are creased and pulled left and right.