JP2586693Y2 - Self-supporting synthetic resin bag - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial applications] This invention is used in stores and homes.
The present invention relates to a synthetic resin bag that can be placed on a shelf or the like in a self-supporting and stable state.

[0002]

2. Description of the Related Art Conventionally, there is a synthetic resin bag B shown in FIGS. 15 to 18 as a synthetic resin bag that can be placed on a shelf or the like in a stand-alone state in a store or at home.

[0003] As shown in the figure, the synthetic resin bag B has a bottom wall 52 bent upward in a mountain-like shape between the lower ends of two superposed front and rear walls 50 and 51, and is inserted into the front and rear walls. Wall 5
The peripheral edges of 0,51 are thermally fused except for the lower edge, and the lower edges of the front and rear walls 50,51 are thermally fused to the lower edge of the bottom wall 52 to form the bag body 53.

[0004] As shown in FIGS.
Is provided with a sealing fastener 54 on the upper part of the bag body 53 in a direction crossing the bag body 53.

[0005] As shown in FIG. 16, the sealing fastener 54 includes a long female member 55 having a U-shaped cross section and a front wall 5.
0, and is formed by providing a long fitting ridge 56 on the inner surface of the rear wall 51, which is detachably fitted to the fitting groove of the female member 55.

[0006] With this configuration, when the filler is not yet filled, the synthetic resin bag B has a flat side cross-sectional shape as shown in FIG.

On the other hand, when the upper end of the synthetic resin bag B is cut with scissors or the like, the sealing fastener 54 is released, and the filler is filled in the storage space 56 of the bag body 53, as shown in FIG. As described above, the mountain-shaped folded bottom wall 52 expands in the front-rear direction to form a flat surface, and a sufficiently large storage space is formed inside the bag body 53. An appropriate amount of the filling can be filled in the bag body 53.

Further, as shown in FIG. 18, such a synthetic resin bag B forms a flat bottom surface having a sufficient width in a filled state, so that the bag B can be placed on a shelf or the like in a self-supporting state and stored.・
Convenient for display.

However, the conventional synthetic resin bag B having the above-mentioned structure still has the following problems to be solved.

[0010]

That is, as shown in FIG. 15, normally, such a synthetic resin bag B is in an unfilled state, that is, in a state where both side surfaces are flat, from the upper end to the lower end in a front view. It has a rectangular shape with the same width W.

Therefore, when the bag body 53 is filled with a certain amount of filler, not only the bottom wall 52 expands in the front-rear direction and becomes flat from the chevron shape, but also the front and rear walls 50, 51
Except for the upper part which is not filled with the filler, the bulges in the front-rear direction around the central part. As a result, FIG.
As shown in FIG. 7, the width W of the upper portion not filled with the filler is maintained as it is, whereas the width w of the other portion filled with the filler is significantly smaller than the width W of the upper portion. When placed on a shelf or the like, it becomes an extremely unstable form.

Therefore, in the operation of placing or removing the synthetic resin bag B on a shelf or the like, there is a possibility that the upper portion of the synthetic resin bag B comes into contact with the adjacent upper portion of the synthetic resin bag B and easily falls over. is there. In addition, visually, it gives the buyer an unstable impression, and impairs the purchase motivation.

Further, since the synthetic resin bags B placed adjacent to each other on a shelf or the like come into contact with each other at the expanded upper portions, there is no waste between the side surfaces of the adjacent synthetic resin bags B. A space is created, and the number of synthetic resin bags B that can be placed on an area of a unit length such as a shelf is limited.

Further, the lower edges of the front and rear walls 50, 51 of the bag body 53 are formed as a rectangular frame surrounding the rectangular bottom wall 52 as shown in FIG. But the front and rear walls 50, 51 forming the bag body 53
Since the upper and lower widths are equal in the unfilled state, the filling of the filler causes the central portions of the front and rear walls 50 and 51 to bulge in the front and rear direction, and the lower ends of the left and right peripheral seal portions are drawn inward, and And narrows in a tapered shape.

Therefore, the lower end edges of the front and rear walls 50, 51 of the bag body 53 do not uniformly contact the mounting surface over the entire circumference, and the stable support of the bag body 53 becomes insufficient. This causes wrinkles at the lower edge, which also impairs aesthetics.

An object of the present invention is to provide a synthetic resin bag capable of solving the above-mentioned problems.

[0017]

According to the present invention, the width of the bag body is gradually reduced from the upper part to the lower part, and the substantially trapezoidal front and rear walls which are gradually formed in a tapered shape are overlapped, and the lower end of the front and rear walls is formed. In between, with the crests of the bottom wall bent in a chevron shape interposed upward, the lower end edges of the front and rear walls, and both lower end edges of the bottom wall are thermally fused to form both lower end peripheral seal portions, Starting from the left and right ends of the lower peripheral seal portion of the front wall, and the left and right ends of the lower peripheral seal portion of the rear wall, along both lower seal portions, from the crest of the bottom wall to both lower edges of the same bottom wall. The end points are the inner positions by a length equal to the length of the bottom wall, the front wall, and the bottom wall and the front wall, from the junction between the crest of the bottom wall and both ends of the front and rear walls to the end points. Are heat-sealed to form a beveled seal part, and the right and left peripheral edges of the front and rear walls are joined from the upper end to the lower end. In a synthetic resin bag formed by heat sealing to form left and right peripheral seal portions, both edges of both lower peripheral seal portions have a taper angle equal to the taper angle formed at both ends of the front and rear walls, and The angle between both edges of the lower peripheral seal portion and the lower ends of the left and right peripheral seal portions is approximately 90 °, and the width of the upper inner opening of the bag is smaller than the width between the upper ends of the oblique seal portions. In addition, the present invention provides a self-supporting synthetic resin bag, wherein the width between the lower ends of the oblique seal portions is smaller than the width of the upper inner opening.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A self-supporting synthetic resin bag A according to the present invention will be specifically described below with reference to the embodiment shown in the accompanying drawings.

In FIG. 1 to FIG. 13, reference numeral 10 denotes a substantially hermetically sealed state in which the entire periphery of the two front and rear walls 11 and 12 and one bottom trapezoidal bottom wall 13 in side view are heat-sealed. , A bag body made of a synthetic resin sealed as shown in FIG. 1, FIG. 8, and FIG. Is formed. Here, the front and rear walls 11 and 12 have a substantially trapezoidal shape that is formed gradually wider from an upper portion to a lower portion.

Further, the bag body 10 is shown in FIGS.
As shown in FIG. 1, the cutting thread 15 is heat-sealed to the inside upper part of the rear wall 12 of the straight cylindrical portion 10a forming the upper part of the bag body 10. The cutting thread 15 extends in a direction crossing the bag body 10, and both ends thereof end at outer ends of the left and right peripheral seal portions 22 and 23 of the bag body 10.

Further, a knob 17 is connected to one end of the cutting thread 15, and the knob 17 is pinched and pulled together with the cutting thread 15 to cut the rear wall 12 and open the upper part of the bag body 10. be able to.

As shown in FIGS. 1 and 2, the bag body
10 has a sealing fastener 18 below the cutting thread 15 and extends in parallel with the cutting thread 15.

The sealing fastener 18 is shown in FIGS.
As shown in the figure, a long female member 19 having a U-shaped cross section is
A long fitting ridge 21 which is welded to the inner surface of the rear wall 11 and is removably fitted to the inner surface of the rear wall 12 with the fitting groove 20 of the female member 19.
Are formed.

With this configuration, the bag thread 10 is cut with the cutting thread 15.
Is cut off, the sealing fitting between the fitting groove 20 and the fitting ridge 21 is released, and a part of the filling F is taken out. Then, the fitting groove 20 and the fitting ridge 21 are sealed again. The fitting prevents moisture and prevents freshness of the filling F as long as possible.

The present invention is characterized in that in the synthetic resin bag A having the above-mentioned structure, the front shape of the bag body 10 is substantially trapezoidal in a state where the filler F is not stored. .

That is, the front and rear walls 10, 11 constituting the bag body 10
Are, as shown in FIG. 2, upper straight portions 11a and 12a, respectively.
And lower tapered portions 11b and 12b whose widths gradually increase downward starting from the ends of the upper straight portions 11a and 12a.

The bag body 10 has the pair of substantially trapezoidal front and rear walls 11 and 12 overlapped with each other, and is bent upward in a mountain shape between the lower ends of the front and rear walls 11 and 12. The bottom wall 13 is inserted, and firstly, the upper ends of the front and rear walls 11 and 12 are heat-sealed laterally to form an upper peripheral seal portion 24. Next, the lower end edge of the front wall 11 and the bottom wall 13 are formed.
And the other lower edge of the bottom wall 13 is heat-welded to the lower edge seal portions 25 and 26, respectively.

Next, the lower peripheral edge sealing portion 25 of the front wall 11
The left and right ends 25c and 25d of the rear wall 12 and the left and right ends 26c and 26d of the lower peripheral edge seal portion 26 of the rear wall 12 are the starting points, respectively. 13 are located at the end points 40a, 40b, and 41, respectively, by a length substantially equal to the length H up to the lower end edges of the thirteen.
a, 41b. And the crest of the bottom wall 13 and the front and rear walls 1
The bottom wall 13 and the front wall 11 and the bottom wall 13 and the rear wall 12 are heat-sealed from the joints 42 and 43 with both ends of the first and second ends 12a to the end points 40a, 41a, 40b and 41b, respectively. To form left and right peripheral seal portions 27, 29, 28, and 30. Further, the right and left peripheral edges of the front and rear walls 11, 12 are thermally fused from the upper end to the lower end to form left and right peripheral seal portions 22, 23. It becomes a bag made of synthetic resin.

The front and rear walls 11, 12 and the bottom wall 13 are preferably manufactured by laminating a required number of synthetic resin films, respectively, as shown in FIG. The bag body 10 in which a sealed storage space 14 is formed is formed by heat-welding the periphery of the base 12 and the bottom wall 13 in a pressurized state using a heat seal bar or the like.

In FIG. 2, b indicates a boundary line between each of the peripheral seal portions 22, 23, 24 and the storage space 12.

Since the present invention has the above-described structure, as shown in FIGS. 2 to 5, when the storage space 14 has not yet been filled with the filler F, the synthetic resin bag A is flat. It has a side surface shape or a side surface cross-sectional shape, and has a trapezoidal front shape in which the width is gradually increased from the upper end to the lower portion in a tapered shape.

On the other hand, when the filler F is filled inside,
The bottom wall 13 folded into an inverted trapezoidal mountain shape is shown in FIGS.
As shown in FIG. 2, the bag is expanded in the front-rear direction to form a rectangular flat surface, and a sufficiently large storage space 14 is formed inside the bag body 10 as shown in FIGS. That is, the storage space 14 can be filled with a sufficient amount of the filler F.

As shown in FIGS. 1 and 10, the bag body 10 has a bottom wall 13 which is expanded in the front-rear direction in a filled state and has a sufficient contact area such as a rectangular shelf having a sufficient width. Can be placed on a shelf or the like in an independent state, which is convenient for storage and display.

Furthermore, when the bag body 10 is filled with a predetermined amount of the filling material F, as shown in FIG. The upper and lower front and rear walls 11 and 12 also swell around the center in the front and rear direction, except for the upper part where the filler F is not filled. As a result, as shown in FIGS. As described above, while the width of the upper portion not filled with the filler F is maintained as it is, the width of other portions filled with the filler F is reduced.

However, as described above, in the present invention, in the unfilled state, that is, when the side surface is flat as shown in FIG. 3, the synthetic resin bag A gradually increases from the upper end to the lower end in a front view. Because its width is expanded in a tapered shape,
When the bag body 10 is filled with the filling material F, as shown in FIGS. 1 and 6, even if the width of the portion where the bag body 10 is filled with the filling material F becomes narrow, the width of the narrowed portion is It is only approximately equal to the width of the upper part, and does not become extremely narrower than the width of the upper part.

Therefore, when placed on a shelf or the like, it can be placed in an extremely stable state.

Therefore, in the operation of placing or removing the synthetic resin bag A on a shelf or the like, it is possible to prevent only the upper portion of the synthetic resin bag A from contacting only the upper portion of the adjacent synthetic resin bag A. , Can be brought into contact over the entire length of the left and right side edges, and the accidental fall of the synthetic resin bag A can be reliably prevented.

Further, as shown in FIG. 1, the synthetic resin bag A according to the present invention visually gives a stable impression to the purchaser and promotes the purchase will.

Further, the synthetic resin bags A placed adjacent to each other on a shelf or the like can be brought into close contact with each other over the entire length of the left and right side edges. No waste space is generated, and the number of synthetic resin bags A that can be placed per unit area of a shelf or the like can be increased.

Particularly, in the present embodiment, the oblique cut seal portions 27, 28,
The dimensional relationship of 29 and 30 is set to the following values.

That is, the width W ₁ of the upper inner opening of the bag body 10 and
And the width W ₂ between the lower end of the beveled sealing portion 27 and 29 (28, 30), the relationship between the width W ₃ of the upper ends of the beveled sealing portion 27 and 29 (28, 30), W ₂ <
It is set to W ₁ <W _3.

By setting the width relation of the synthetic resin bag A in this way, when the filling F is filled in the bag main body 10, as shown in FIGS. Can have a stable box shape.

In this embodiment, when the filling material F is filled into the bag body 10, as shown in FIGS. 1, 6, 9, and 10, the oblique cut seal portions 27, 28 and 29, respectively, are used. The portion sandwiched between 30 forms vertical walls 13a and 13b of an isosceles triangle shape.

However, in this embodiment, the left and right peripheral seal portions
The lower end portions of the front and rear walls 11, 12 forming both sides of the lower end portions 22b, 23b of the 22, 23 form skirt portions 31, 32, and the skirt portions 31, 3 are formed.
2 hides the above-mentioned vertical walls 13a, 13b, so that the appearance of the synthetic resin bag A is not impaired. In addition, the skirt part
31 and 32 can also be subjected to desired printing.

Further, as shown in FIG.
1 and 32, the lower end portions 22b and 23b of the left and right peripheral seal portions 22 and 23, and the both edge portions 25a and 26 of the lower peripheral seal portions 25 and 26.
a, 25b and 26b have the following relationship.

That is, the lower end portions 22 of the left and right peripheral seal portions 22, 23
b and 23b, as shown in FIG. 11, the bag body 10 has a constant taper angle α in a state where the filler F is not filled, but the same taper angle α has the same taper angle α as that of the lower peripheral seal portions 25 and 26. Both edges 25a, 26a, 25b, 26b are also provided, and lower end portions 22b, 23b of left and right peripheral seal portions 22, 23 and lower end peripheral seal portions 25,
The angle β between the two edges 26a, 26a, 25b, and 26b is approximately 90 °.

Accordingly, when the bag body 10 is filled with the filling material F, the lower end portions 22b and 23b of the left and right peripheral seal portions 22 and 23 are connected to the bag body 10 as shown in FIGS. Is perpendicular to the mounting surface of a shelf or the like that supports the lower edge, but at the same time, both edges 25a, 2 of the lower peripheral seal portions 25, 26.
6a, 25b, 26b and the lower edges of the skirts 31, 32 all abut against the mounting surface of the shelf or the like, so that the synthetic resin bag A can be stably and beautifully supported on the shelf or the like. .

Other structural features of the above embodiment will be described below.

As shown in FIG. 12, in this embodiment, the cut yarn
Reference numeral 15 has a three-layered concentric structure, and includes a central yarn 34, an intermediate adhesive layer 35, and an outer heat-welding layer 36. The outer heat welding layer 36 is fixed to the center yarn 34 by an intermediate adhesive layer 35.

The center yarn 34 is preferably made of polyester, and preferably has a circular cross section. However, the center thread 34 may have an elliptical, polygonal, etc. cross-section, or may have splines on its outer surface.

The intermediate adhesive layer 35 is formed by covering the central yarn 34 with neoprene.

However, the intermediate adhesive layer 35 can be a nitrile rubber made of epoxy polyamide.

The outer heat welding layer 36 is preferably made of polypropylene, and is formed so as to be concentric with the intermediate adhesive layer 35. However, the outer heat welded layer 36 can be made of polypropylene or a copolymer of polyethylene and polypropylene.

The cutting thread 15 having such a three-layer structure can be fixed to the inner surface of the rear wall 12 of the bag body 10 by welding the outer heat welding layer 36 over the entirety.

However, the cut yarn 15 does not necessarily have to have a three-layer structure, and may have a single-layer structure.

Next, the picking side 17 formed on the left peripheral seal portion 22 where one end of the cutting thread 15 ends will be specifically described below with reference to FIGS.

The knob 17 is substantially a left peripheral seal portion.
A semicircular ear 37 projecting outward from the edge of 22;
37, a U-shaped notch slit 38 located inside from the outer end of the bag 37, and a transverse opening groove 39 at a position adjacent to the notch slit 38 and close to the inside of the bag body 10.
And formed from

The notch slit 38 is provided in the left peripheral seal portion 22.
Circular cut 38a spaced from the lateral outer edge of
And a pair of side cuts 38b and 38c provided symmetrically on both sides of the cutting thread 15.

The inside ends of the side cuts 38b and 38c are
It is straight or inclined to the cutting thread 15 so that it can be connected well to the transverse groove 39 when the 17 is pulled.

As shown in detail in FIG. 13, the transverse groove 39 traverses the cutting thread 15 between the inside of the bag body 10 and the inner ends of the side cuts 38b and 38c of the notch slit 38. Further, the cutting thread 15 passes through the center of the transverse groove 39.

The transverse groove 39 has a length L ₁ traversing the cutting thread 15, and is formed by the side cut 38 of the notch slit 38.
b, 38c are larger than the distance D between the inner ends, so that when the knob 17 is pulled upward, the side cuts 38b, 38c
Can reliably reach the transverse groove 39 exactly.

Further, the transverse groove 39 has an inner tapered end 39a provided on the cutting thread 15 and adjacent to the inside of the bag body 10. The inner tapered end 39a has an angle of 90 ° or less with respect to the cutting thread 15 as measured from the open end toward the inside of the bag body 10. With the above configuration, the cutting thread 15 can be always guided on the line of the transverse groove 39. The end of the cutting thread 15 is
This end is sandwiched between the front and rear walls 11 and 12 of the peripheral seal portion 22.

[0063] Further, in this embodiment, the knob edge 17, as shown in FIG. 13, with comprises a color mark M ₁ of a different color with the bag body 10 in its periphery, in its interior,
And a knob piece display unit M _2. Then, the knob piece display unit M _2, and is marked "TAB".

The color mark M ₁ may be any color as long as it has a clear contrast with the color of the bag body A.

By providing the color mark M ₁ and the knob display section M ₂ , the position of the knob 17 can be easily visually recognized, and the pulling direction of the knob 17 or the notch direction of the notch 15 can be obtained. The notch operation can be performed easily and smoothly.

Further, as shown in FIG.
Is provided on the semicircular ear portion 37 protruding outward from the outer edge of the left peripheral seal portion 22, so that the boundary line b between the peripheral seal portion 14 and the storage space 12 is In the upper part, the bag can be straightened over its entire length without swelling inside.
4 can be smoothly filled and unloaded.

Incidentally, the synthetic resin bag A according to the present invention can be manufactured by mounting it on an automatic manufacturing line. In this case, the side edges of the trapezoidal front and rear walls 11 and 12 constituting the bag main body 10 are not formed. It can be performed by a punching process in addition to a normal cutter. In the case of punching, since a bendable thin blade is used, the same side edge can be formed not only in a straight line but also in an arbitrary curved line, and the overall shape of the synthetic resin bag A is improved in stability. It is possible to make the shape according to the taste of the consumer while securing.

FIG. 14 shows a modified example of the synthetic resin bag A described above, which is characterized in that the bag body 10 has a wide structure.

[0069]

[Effect] As described above, in the present invention, the width of the bag body is
From the upper part to the lower part, the substantially trapezoidal front and rear walls formed gradually in a tapered shape are superimposed, and between the lower end parts of the front and rear walls, the crest of the bottom wall bent into a chevron shape is interposed with the crest upward. The lower end edges of the front and rear walls and the lower end edges of the bottom wall are heat-fused to form the lower end peripheral seal portions, and the left and right ends of the lower end peripheral seal portions of the front wall and the lower end peripheral seal of the rear wall. The left and right ends of the bottom part are the starting points, and the inner positions along the both lower end seals by a length equal to the length from the crest of the bottom wall to the lower end edges of the bottom wall are the end points, respectively. The bottom wall and the front wall, and the bottom wall and the rear wall are each heat-sealed to form a bevel-sealed portion from the joint between the portion and both end portions of the front and rear walls to the respective end points. The left and right peripheral parts are heat-sealed from the upper end to the lower end to form a left and right peripheral seal part. By doing so, when the filling is filled, the front view of the bag can be made substantially rectangular, and when placed on a shelf or the like, no wasteful space is created, and the planting efficiency can be increased. The mounting state can be made stable.

Further, both edges of the lower end peripheral seal portions are
By making the taper angle equal to the taper angle formed at both ends of the front and rear walls and making the angle between both edges of the lower end peripheral seal portions and the lower end portions of the left and right peripheral seal portions approximately 90 °, the inside of the bag is improved. When the filling is filled, both edges of the lower end peripheral seal portions become the skirt bottom on the side of the bag, and the bottom of the skirt comes into full contact with the mounting surface, and the bag is supported on a shelf or the like in order to support the bag. It can be stably mounted. Further, the lower end peripheral seal portion and the skirt bottom portion are hardened because they are heat-sealed, so that the bag filled with the filling material can be more stably placed on a shelf or the like. In addition, the width of the upper inner opening of the bag is made smaller than the width between the upper ends of the oblique seal portions, and the width between the lower ends of the oblique seal portions is made smaller than the width of the upper inner opening. When the inside is filled with the filling material, the bag can have a more stable substantially rectangular shape when viewed from the front.

[Brief description of the drawings]

FIG. 1 is a perspective view of a synthetic resin bag according to the present invention in a stored state.

FIG. 2 is a front view of the synthetic resin bag in an unstored state.

FIG. 3 is a side view of the same.

FIG. 4 is a cross-sectional side view taken along the line II of FIG. 2;

FIG. 5 is an enlarged sectional side view of the main part.

FIG. 6 is a front view of the synthetic resin bag in a housed state.

FIG. 7 is a side view of the same.

FIG. 8 is a sectional side view of the same.

9 is a sectional front view taken along line II-II in FIG.

FIG. 10 is a bottom view of the same.

FIG. 11 is an enlarged front view of a lower portion of the bag body.

FIG. 12 is a sectional view of a cut yarn.

FIG. 13 is an enlarged front view of a knob forming portion.

FIG. 14 is a front view of a modified example of a synthetic resin bag.

FIG. 15 is a front view of a conventional synthetic resin bag in an unstored state.

FIG. 16 is a sectional view taken along line III-III in FIG. 15;

FIG. 17 is a front view of the storage state of the synthetic resin bag.

FIG. 18 is a perspective view of the synthetic resin bag in a stored state.

[Explanation of symbols]

 A Synthetic resin bag 10 Bag body 11 Front wall 12 Rear wall 13 Bottom wall 15 Cutting thread 17 Knob 22 Left peripheral seal 23 Right peripheral seal 24 Upper peripheral seal 25 Lower peripheral seal 26 Lower peripheral seal 27 Bevel Cut seal part 28 Bevel seal part 29 Bevel seal part 30 Bevel seal part 37 Ear part

Claims (1)

(57) [Scope of request for utility model registration] 1. The width of a bag (10) body is made lower than its upper part.
In front of a substantially trapezoidal shape gradually widened in a tapered shape toward
Polymerizing rear wall (11) (12), between the lower end portion of the front and rear walls (11) (12), folding the chevron shape
With the crest of the bent bottom wall (13) facing upward,
Lower edges of the rear walls (11) and (12) and both lower sides of the bottom wall (13)
The lower edges are sealed by heat fusion with the edges (25) (2).
6) and the left and right ends (2) of the lower peripheral edge seal portion (25) of the front wall (11).
5c) (25d) and the lower peripheral edge of the rear wall (12)
The left and right ends (26c) and (26d) of the
As a starting point, along the lower end seal portions (25) and (26),
From the crest of the bottom wall (13) to both lower edges of the bottom wall (13)
The inner position by a length equal to the length (H) at
The end points (40a), (40b), (41a), and (41b) are set, and the crest of the bottom wall (13) and both ends of the front and rear walls (11) and (12)
From the joints (42) and (43) with the respective end points (40
a) up to (40b), (41a) and (41b), the bottom wall (1
3) and front wall (11), and bottom wall (13) and rear wall (1).
2) are heat-sealed, respectively.
9) (28) and (30) are formed, and the left and right peripheral portions of the front and rear walls (11) and (12) are
Heat sealing from top to bottom, left and right peripheral seals (22)
In the bag made of synthetic resin formed with (23), both edges (25) of both lower end peripheral seal portions (25) and (26)
a) (25b), (26a) and (26b)
1) (12) Taper equal to the taper angle formed at both ends
An angle is provided, and both lower peripheral edges are sealed (25)
(26) Both edges (25a) (25b) (26a) (2
6b) and lower end portions of the left and right peripheral seal portions (22) and (23).
(22b) The angle formed with (23b) is approximately 90 °, and the width (W ₁ ) of the upper inner opening of the bag (10 ) is determined by oblique cutting.
Width (W) between the upper ends of the portions (27), (29), (28), and (30)
₃ ) It is smaller than the above, and the oblique cut seal portion (27) (2)
9) The width (W ₂ ) between the lower ends of (28) and (30) is
A self-supporting synthetic resin bag characterized in that the width is smaller than the width (W ₁ ) of the inside opening .