JP2009040432A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag capable of suppressing generation of wrinkles on the upper edge of the packaging bag. <P>SOLUTION: The main body part 10 of the packaging bag is constituted by a bottom face sheet and a pair of side face sheets. The bottom face sheet and a pair of the side face sheets are heat-welded at a bottom edge bonding part 13. For a pair of side face sheets, their side edges are heat-welded to each other at side edge bonding parts 14. In addition, a pair of the side face sheets are heat-welded at projecting bonding parts 16 projecting so as to form a semi-circular shape toward the central side of the main body part 10 from the side edge bonding parts 14 in the width direction of the main body part 10. The projection lengths X of these projecting bonding parts 16 are formed so as to occupy 1/15-1/5 of the width Y of the main body part 10 (the side face sheet). The formed positions of the projecting bonding parts 16 are determined so that the length Z from the largest parts of the lengths of the projections of the projecting bonding parts 16 to the lower end of the main body part 10 is 1/3-1/2 of the height T of the main body part 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a packaging bag having self-supporting properties and having a reinforcing material on a side edge thereof.

  2. Description of the Related Art Conventionally, a packaging bag technique that reinforces a bag-shaped main body portion made of a resin sheet with a reinforcing material for the purpose of preventing breakage of the packaging bag and improving self-supporting property is known. For example, Patent Document 1 discloses that a side edge of a main body portion of a packaging bag is covered with a reinforcing material made of a thermoplastic resin.

Specifically, the main body portion of the packaging bag described in Patent Document 1 includes a bottom sheet folded in half and a pair of side sheets sandwiching the bottom sheet. And it forms in the bag shape by heat-welding the periphery of a bottom sheet, a side sheet, and side sheets. A columnar reinforcing material made of a thermoplastic resin is attached to the side edge of the main body along the shape of the side edge. By this reinforcing material, the body portion is prevented from being bent and the self-supporting property is improved.
JP 2007-55649 A

  For example, product information such as a product name, a manufacturer, and a component of contents is printed on the outer surface of the packaging bag, and this product information should be easily visible to consumers when displayed at a store. Accordingly, when the packaging bag filled with the contents is broken or wrinkled, it is not preferable because product information printed on the outer surface of the packaging bag becomes difficult to read. In addition, if the packaging bag is folded or wrinkled, the packaging bag as a product may not look good at the time of display at the store, which may reduce consumers' willingness to purchase.

  In the packaging bag described in Patent Document 1, since the reinforcing material is attached to the side edge, folding and wrinkling along the width direction of the packaging bag such as middle folding can be prevented. However, since no reinforcing material is attached to the upper edge of the packaging bag, it is difficult to prevent wrinkles on the upper edge of the packaging bag. Therefore, the product information printed on the outer surface of the packaging bag may still be difficult to read, or the packaging bag may not look good.

  The present invention has been made in view of the circumstances of the prior art, and in a packaging bag in which a reinforcing material is attached to a main body portion, not only folding and wrinkling along the width direction of the packaging bag, but also on the packaging bag. It aims at providing the packaging bag which can also suppress generation | occurrence | production of a wrinkle of an edge.

  In order to achieve the above object, the packaging bag of the invention according to claim 1 includes a main body portion formed in a bag shape having a self-supporting property by bonding a pair of side sheets and a bottom sheet to each other at an adhesive portion. A packaging bag made of a thermoplastic resin and provided with a columnar reinforcing material attached to the main body, wherein the reinforcing material covers at least a part of a side edge bonding portion formed on a side edge of the main body. The pair of side sheets are bonded by a protruding adhesive portion formed so as to protrude from the side edge adhesive portion to the center side of the main body portion, and adjacent to the protruding adhesive portion in the width direction of the main body portion. The side edge bonding portion is covered with the reinforcing material.

  According to this configuration, the main body portion of the packaging bag is constricted at the portion where the protruding adhesive portion is formed, and the internal space of the main body portion is divided into an upper space above the constricted portion and a lower lower space. . In the packaging bag that adopts the main body part that forms this protruding adhesive part and the packaging bag that adopts the main body part that does not form the protruding adhesive part, when the same amount of content is filled, the former is more in the upper space. The contents can be filled. At this time, the side edge adhesive portion or the reinforcing material that covers the side edge adhesive portion is subjected to a force to be spaced apart from each other, so that tension is given to the upper edge of the main body portion. Therefore, even if the upper edge of the main body is not covered with the reinforcing material, wrinkles on the upper edge of the packaging bag are suppressed.

  According to a second aspect of the present invention, in the packaging bag of the first aspect of the present invention, the protruding adhesive portions are formed in the same shape on both side edges of the main body portion, and the protruding adhesive portions on both side edges. Are arranged at the same height in the height direction of the main body part, and the protruding adhesive part has a length from the largest protruding part of the protruding adhesive part to the lower end of the main body part of the main body part. It is characterized by being formed to be 1/3 to 1/2 of the height.

  If the protruding adhesive part is formed at a low position, the upper space in the packaging bag becomes larger, and accordingly the amount of contents filled in the upper space also increases. The forces that try to move away from each other are considerably larger. However, if the protruding adhesive portion is formed at a too low position, the balance between the amount of contents filled in the upper space and the amount of contents filled in the lower space is lost, and the self-supporting property of the packaging bag may be reduced. There is. Since the structure of the invention which concerns on Claim 2 has set the position of a protrusion adhesion | attachment part appropriately, it maintains the self-supporting property of a packaging bag suitably, suppressing the wrinkle generation | occurrence | production of the upper edge of a packaging bag suitably.

  According to a third aspect of the invention, in the packaging bag of the first or second aspect of the invention, the protruding adhesive portion is 1 / of the width of the main body portion in the portion where the protruding adhesive portion is formed. It is formed to occupy 15 to 1/5. When the occupation ratio of the protruding adhesive portion with respect to the width of the main body portion is excessively increased, the degree of separation between the upper space and the lower space is increased, and the packaging bag is likely to be folded in the width direction. In this case, the fluidity of the contents between the upper space and the lower space is reduced. In the invention according to claim 3, since the occupation ratio is appropriately set, such inconvenience does not occur.

  According to a fourth aspect of the present invention, in the packaging bag according to any one of the first to third aspects, the protruding adhesive portion protrudes in a semicircular shape. To do. According to this configuration, the contents smoothly flow along the arc shape of the outer edge of the protruding adhesive portion when the contents are filled and discharged.

  According to a fifth aspect of the present invention, in the packaging bag according to any one of the first to fourth aspects, the main body includes a pair of a bottom sheet folded in two and a pair of sandwiching the bottom sheet The bottom sheet and the side sheet are bonded by a bottom edge bonding portion formed so as to be recessed in an arc shape, and the height at both ends of the bottom edge bonding portion is the bottom edge bonding. It is formed so that it may become 24 to 34% of the width | variety of the said main-body part in the part in which the part is formed.

  When filling a packaging bag having a bottom sheet and a pair of side sheets, the lower ends of the side sheets are separated from each other, and the entire bottom surface of the packaging bag is elliptical or rectangular when viewed from below. Independence is realized. In the invention which concerns on Claim 5, the height of the both ends of a bottom edge adhesion | attachment part is set to 24-34% of the width | variety of the main-body part in the part in which the bottom edge adhesion | attachment part is formed. When viewed from above, the entire lower surface of the packaging bag is substantially square. Therefore, the packaging bag is unlikely to fall down in both the width direction and the thickness direction, and the self-supporting stability is improved.

  According to the packaging bag of the present invention, wrinkles on the upper edge of the packaging bag in a state where the contents are filled can be suppressed.

  Hereinafter, an embodiment relating to a packaging bag having a content distribution port will be described with reference to FIGS. As shown in FIG. 1, the packaging bag of the present embodiment is disposed on a bag-like main body portion 10 for storing contents, a columnar reinforcing member 20 attached to the main body portion 10, and an upper portion of the main body portion 10. At the same time, it is configured with a mouthpiece 30 as a content distribution port that allows the content to flow.

  As shown in FIG. 2, the main body 10 of the packaging bag is composed of a bottom sheet 11 folded in half so that the crease faces upward (upper side in FIG. 2) and a pair of side sheets 12 sandwiching the bottom sheet 11 therebetween. Yes. The bottom sheet 11 is formed in a quadrangular shape and has cutout portions 11a in which four corners are cut out in a quadrangular shape. The bottom sheet 11 is folded in two so that the surfaces (outer surfaces) facing the pair of side sheets 12 to be described later have thermal weldability and the inner surfaces are non-thermal weldable. Is formed.

  The side surface sheet 12 is formed in a substantially trapezoidal shape in which both shoulders of a vertically long rectangular shape are cut in an arc shape, and has a cutout portion 12a in which two lower corners are cut out in a square shape. Further, the side sheet 12 is formed so that one surface has heat-weldability, and when the bottom sheet 11 is sandwiched from both sides, the heat-weldable surfaces of the side sheets 12 are arranged to face each other. .

  As shown in FIGS. 1 and 3, the folded bottom sheet 11 and the pair of side sheets 12 are thermally welded at the bottom edge bonding portion 13 to form a four-layer structure. As shown in FIG. 1, the bottom edge bonding portion 13 is formed to be a region surrounded by a curved line that is recessed in an arc shape when viewed from the front and the side edge and bottom edge of the main body portion 10 (side sheet 12). Yes. The height L at both side ends 13 a of the bottom edge bonding portion 13 is set to 24 to 34% of the width Y of the main body portion 10. The notch 10 a of the main body 10 is composed of a notch 11 a of the bottom sheet 11 and a notch 12 a of the side sheet 12.

  As shown in FIGS. 1 and 3, the side edges of the pair of side sheets 12 are thermally welded to each other at the side edge adhesive portion 14, and the side edge adhesive portion 14 has a two-layer structure with the pair of side sheets 12 above. And a lower layer thereof has a four-layer structure of a pair of side sheets 12 and a bottom sheet 11 folded in two. As shown in FIG. 1, the side edge bonding portion 14 is formed so as to maintain a constant width (width in the left-right direction in FIG. 1) in a portion where the side edge of the main body portion 10 is formed in a straight line. . And in the part currently formed in circular arc shape among the side edges of the main-body part 10, the side edge adhesion part 14 is formed so that the width | variety may become large gradually upwards. In this portion, the inner side 14 a of the side edge bonding portion 14 has an arc shape having a larger curvature than the arc of the main body portion 10.

  Further, the pair of side sheets 12 are heat-welded by a protruding adhesive portion 16 that protrudes in a semicircular shape from the side edge adhesive portion 14 toward the center side of the main body portion 10 in the width direction of the main body portion 10. Yes. The protruding adhesive portions 16 protrude from the side edge adhesive portions 14 on both sides of the main body portion 10, and the protruding adhesive portions 16 on both sides are formed in the same shape and at the same height. The protruding length X of the protruding adhesive portion 16 is formed to be 1/30 to 1/10 of the width Y of the main body portion 10 (side sheet 12). In this embodiment, since the protruding adhesive portions 16 are formed at the same height on both sides of the main body portion 10, the two protruding adhesive portions 16 occupy 1/15 to 1/5 of the width Y of the main body portion 10. ing. Then, the protruding adhesive portion 16 is formed so that the length Z from the largest protruding portion of the protruding adhesive portion 16 to the lower end of the main body portion 10 is 1/3 to 1/2 of the height T of the main body portion 10. The position has been determined. In the present embodiment, the protruding adhesive part 16 has a side edge at the boundary between the two-layer structure part and the four-layer structure part of the side edge adhesive part 14 (the highest position of the side edges 13a of the bottom edge adhesive part 13). It is set to indicate the entire portion protruding larger than the width of the bonding portion 14.

  As shown in FIGS. 1 and 3, the pair of side sheets 12 are heat-welded at their upper edges at the upper edge bonding portion 15, and the upper edge bonding portion 15 has a two-layer structure of the pair of side sheet 12. ing. Moreover, in the center of the upper edge adhesion part 15, a pair of side surface sheet | seat 12 is heat-welded, pinching the lower part of the cylindrical body 31 of the mouthpiece 30 mentioned later.

  As shown in FIGS. 1 and 3, a reinforcing member 20 made of a thermoplastic resin is attached to the side edge of the main body 10. The reinforcing member 20 is formed in a columnar shape along the side edge shape of the main body 10. In the present embodiment, the reinforcing member 20 extends from the upper end edge of the side edge bonding portion 14 of the main body portion 10 until reaching the same position (height) as the cutout surface of the cutout portion 10a. The reinforcing member 20 has a U-shaped cross section when viewed in the short direction, and the outer side of the side edge bonding portion 14 (side end of the main body portion 10) is covered with the reinforcing member 20. At the same time, the inner side 14 a is exposed without being covered with the reinforcing material 20.

  As shown in FIGS. 1 and 3, a mouthpiece 30 is provided at the center of the upper edge of the main body 10 to allow the contents to flow. The mouthpiece 30 includes a cylindrical body 31 having a predetermined opening and a cap 32 that can be attached to and detached from the opening of the cylindrical body 31. The cap 32 is attached to and detached from the cylindrical body 31 by rotating. The tubular body 31 of the mouthpiece 30 is fixed to the upper edge of the main body 10 by being sandwiched between the pair of side sheets 12 described above.

According to the packaging bag of the said embodiment, the following effects can be obtained.
(1) In the packaging bag of the present embodiment that employs the main body portion 10 in which the protruding adhesive portion 16 is formed and the conventional packaging bag in which the main body portion 10 that does not form the protruding adhesive portion 16 is used, the same amount of content is contained. In the case of filling, the former can fill the upper space with the contents. When the packaging bag of the present embodiment is filled with the contents, as shown in FIG. 3, the main body portion 10 of the packaging bag is constricted at the portion where the protruding adhesive portion 16 is formed, and the inside of the packaging bag is the constricted portion. It is divided into an upper space U located above and a lower space D located below. And the direction of the packaging bag of this embodiment can push the content upwards (upper space U) according to the constriction rather than the conventional packaging bag. Therefore, it is possible to suppress the occurrence of wrinkles in the upper edge adhesive portion 15 of the main body portion 10 due to relatively strong force for separating the side edge adhesive portion 14 and the reinforcing material 20 on the upper side. If the protruding adhesive portion 16 is not formed, the force to approach the side edge adhesive portion 14 and the reinforcing material 20 on the upper side becomes relatively strong, and the upper edge adhesive portion 15 of the main body portion 10 is wrinkled. obtain.

  (2) In the present embodiment, the length Z from the portion with the largest protruding length of the protruding adhesive portion 16 to the lower end of the main body portion 10 is 1/3 to 1/2 of the height T of the main body portion 10. The protruding adhesive part 16 was disposed. If the height position of the protruding adhesive portion 16 is set, the amount of the contents filled in the upper space U is not too much, so that the effect of suppressing the wrinkles of the upper edge adhesive portion 15 is exhibited and the packaging bag Independence stability can be maintained.

  (3) In this embodiment, the protruding lengths of the protruding adhesive portions 16 on both side edges so as to occupy 1/15 to 1/5 of the width of the main body portion 10 by the protruding adhesive portions 16 formed on both side edges of the main body portion 10. X was set. When the protruding length X of the protruding adhesive portion 16 is increased, the degree of separation between the upper space U and the lower space D is increased, and the folding in the width direction of the packaging bag is likely to occur, and the smooth flow of the contents is hindered. If the projection length X is set as described above, the effect of suppressing wrinkles of the upper edge bonding portion 15 can be exhibited while minimizing the possibility of the folding of the packaging bag and the smooth flow of the contents.

  (4) In the present embodiment, the protruding adhesive portion 16 is formed so as to swell in a semicircular shape. Therefore, the contents can quickly flow along the semicircular shape of the protruding adhesive portion 16, and the flow of the contents is hardly hindered.

  (5) In the present embodiment, the height L at the both side ends 13 a of the bottom edge bonding portion 13 is 24 to 34% of the width Y of the main body portion 10. When the height of both side ends 13a of the bottom edge bonding portion 13 is set as described above, when the packaging bag is filled with the contents, the entire bottom surface of the packaging bag is substantially square when the packaging bag is viewed from below. become. Therefore, the packaging bag is unlikely to fall down in either the width direction or the thickness direction of the packaging bag. Moreover, if this height L is set lower than 27% of the width Y of the main body part 10, wrinkles may occur at the lower edge of the bottom edge bonding part 13 and the self-supporting property of the packaging bag may be lowered. In order to suppress the generation of wrinkles, it is particularly preferable to set the height L to 29 to 34% of the width Y of the main body 10.

  (6) Since the reinforcing material 20 is attached to the side edge adhesion part 14 of the main-body part 10 in the packaging bag of this embodiment, a middle break etc. are prevented. In particular, when the protruding adhesive portion 16 is formed, it is conceivable that middle breakage or the like occurs near the protruding adhesive portion 16, but such a situation can be avoided by the presence of the reinforcing material 20.

  (7) The inner side 14 a of the side edge bonding portion 14 of the main body portion 10 is exposed without being covered with the reinforcing material 20. Therefore, even if an abnormal force that separates the pair of side sheets 12 occurs in the main body portion 10 such as when the packaging bag falls, it can be avoided that the force acts directly on the reinforcing member 20. .

  (8) The side edge bonding portion 14 is formed so that the width gradually increases as it goes upward. Since the side edge bonding portion 14 is heat-welded with the pair of side sheets 12, the side edge bonding portion 14 has higher strength than the portion made of one side sheet 12. In the vicinity of the upper edge bonding portion 15, the width of the side edge bonding portion 14 is increased to widen the region where the pair of side surface sheets 12 are bonded, so that the effect of suppressing wrinkling of the upper edge bonding portion 15 can be expected. .

In addition, you may change the said embodiment as follows.
In the above embodiment, the protruding adhesive portions 16 are formed on both sides of the side edge of the main body portion 10, but the protruding adhesive portions 41 are formed only on one side of the side edge of the main body portion 10, as shown in FIG. May be. In this case, it is better to increase the protruding length X so as to occupy 1/15 to 1/5 of the width Y of the main body 10 (for example, about twice the protruding length X of the protruding adhesive portion 16 of the above embodiment). In addition, when forming the protrusion adhesion part 16 (41) only in the one side of the main-body part 10, the reinforcing material 20 does not necessarily need to be formed in the side edge of the side in which the protrusion adhesion part 16 (41) is not formed. .

  -The semicircular shape of the protrusion adhesion part 16 is not restricted to the thing of the said embodiment. For example, as shown in FIG. 4B, a triangular projecting adhesive portion 42 may be employed, or a quadrangular projecting adhesive portion 43 may be employed. Alternatively, a protrusion that extends linearly from the side edge bonding portion 14 toward the center of the main body 10 may be employed as the protruding bonding portion 16.

  -The protrusion length X of the protrusion adhesion part 16 is not restricted to the range illustrated by the said embodiment. For example, the protruding adhesive portions 41 having a large protruding length X shown in FIG. 4A are formed on the side edge adhesive portions 14 on both sides of the main body portion 10 so as to occupy 1/5 or more of the width Y of the main body portion 10. Also good. Conversely, a protruding adhesive portion 16 having a small protruding length X may be employed.

  -The height position of the protrusion adhesion part 16 is not restricted to the range illustrated in the said embodiment. As shown in FIG. 4C, the protruding adhesive part 16 may be formed on the upper side of the side edge of the main body part 10, or conversely, the protruding adhesive part 16 may be formed on the lower side. . Alternatively, the height position of each protruding adhesive portion 16 may be shifted.

  In this way, whether the protruding adhesive portion 16 is formed on one or both of the side edge adhesive portions 14 of the main body portion 10, and how the protruding adhesive portion 16 is shaped, protruded length X and height position are determined. Whether or not to do so may be changed as appropriate by combining the above embodiment and the above modifications in consideration of the shape of the main body portion 10 of the packaging bag, the inner volume, the type of contents filled in the packaging bag, and the like.

  In the above embodiment, the reinforcing material 20 is formed from the upper edge of the side edge bonding portion 14 to the same position (height) as the notched surface of the notched portion 10a, but the forming position of the reinforcing material 20 is not limited to this. . For example, like the reinforcing material 45 shown in FIG. 4D, the reinforcing material 20 may be formed including at least a portion adjacent to the protruding adhesive portion 16 in the side edge adhesive portion 14.

  -The structure of the reinforcing material 20 is not restricted to the thing of the said embodiment. For example, the lower end of the reinforcing member 20 may be disposed below the lower end of the side edge bonding portion 14 of the main body portion 10 so as to face the notch portion 10a. Moreover, you may change so that the reinforcing material 20 may be located in the same position as the bottom edge of the main-body part 10, or a position lower than a bottom edge irrespective of the presence or absence of the notch part 10a.

  -The structure of the bottom edge adhesion part 13 is not ask | required. For example, although the height L of the both side ends 13a of the bottom edge bonding portion 13 is set to 24 to 34% of the width Y of the main body portion 10, a height higher than this range or a height lower than this range may be adopted. Furthermore, the shape of the bottom edge bonding portion 13 is not limited to that of the above embodiment, and it is sufficient that the bag-shaped main body portion 10 can be formed. For example, the arc-shaped portion of the bottom edge bonding portion 13 may be formed in a straight line instead of a curve, and may be formed in an inverted trapezoidal shape in which the left and right widths become narrower toward the bottom. Or it is good also as the linear bottom edge adhesion part 13 which eliminated the circular arc-shaped part and edged the bottom edge of the main-body part 10. FIG.

  -The sheet | seat structure of the main-body part 10 is not restricted to the thing of the said embodiment. For example, one side sheet 12 folded in half may be used as a pair of side sheets 12. Further, a sheet obtained by bending a sheet a plurality of times may be used as the bottom sheet 11 and the pair of side sheets 12 of the main body 10. Alternatively, four or more sheets may be combined. Thus, as long as it has a pair of side surface and bottom surface as the main-body part 10, a sheet | seat structure will not be ask | required.

  -The shape of the main-body part 10 is not restricted to the thing of the said embodiment. For example, in the above-described embodiment, the upper edge of the main body portion 10 is formed to extend in the horizontal direction. However, the upper edge is not limited thereto, and the arc shape is such that the center of the main body portion 10 swells or is recessed. You may change the shape of an upper edge so that it may become this curve. Further, the shape of the main body 10 is not particularly limited, for example, the main body 10 may have a square shape in a plan view, or may be changed to a triangular shape or the like.

  -The shape of the notch part 10a of the main-body part 10 is not ask | required. For example, you may employ | adopt the notch part 10a notched by the triangular shape and the notch part 10a notched by the fan shape. Moreover, the lower end shape of the reinforcing member 20 may be formed obliquely in accordance with the shape of the notch 10a, or may be formed in an arc shape.

-Adhesion of each sheet is not limited to thermal welding, but may be changed to, for example, adhesive bonding, ultrasonic bonding, high-frequency bonding, or the like.
-In above-mentioned embodiment, although the mouthpiece 30 was provided in the center among the upper edges of the main-body part 10, the arrangement | positioning position of the mouthpiece 30 is not restricted to this. For example, you may provide in the edge of the upper edge of the main-body part 10, or you may provide in the upper side among the side edges of the main-body part 10. In addition, the mouthpiece 30 as the content distribution port is not limited to that of the above-described embodiment, and for example, a fastener may be provided instead of the mouthpiece 30 so that the mouthpiece 30 can be opened and closed. Or it is good also as a content distribution opening | mouth by opening the main-body part 10 at the time of use by providing the cut which can be cut off.

Next, technical ideas that can be grasped from the above-described embodiment and modified examples will be described below together with their effects.
The side edges of the pair of side sheets are bonded to each other at a side edge bonding portion, and the width of the side edge bonding portion increases toward the upper side above the portion where the protruding bonding portion is formed. It is formed so that it may become a packaging bag. According to this structure, since the area | region bonded in the upper edge vicinity of the packaging bag which is easy to generate | occur | produce a wrinkle is large, generation | occurrence | production of a wrinkle is suppressed.

  The packaging bag is characterized in that the protruding adhesive portion protrudes so as to have a shape in which the protruding length is gradually increased or decreased in the height direction. According to this configuration, the same effect as (4) of the above embodiment can be obtained.

The front view of the packaging bag of this embodiment. The disassembled perspective view of the packaging bag of this embodiment. The perspective view at the time of filling the packaging bag of this embodiment with the contents. (A)-(d) is a front view of the packaging bag in a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Main-body part, 11 ... Bottom sheet, 12 ... Side sheet, 13 ... Bottom edge adhesion part, 13a ... Side edge of bottom edge adhesion part, 14 ... Side edge adhesion part, 14a ... Inner side edge adhesion part, 15 ... Upper edge adhesive part, 16 ... protruding adhesive part, 20 ... reinforcing material, 30 ... mouthpiece, U ... upper space, D ... lower space, L ... height of both side ends of bottom edge adhesive part, T ... height of main body part X: Projection length of the projecting adhesive part, Y: Width of the main body part, Z: Length from the largest projecting length of the projecting adhesive part to the lower end of the main body part.

Claims (5)

A pair of side sheets and a bottom sheet are bonded to each other by an adhesive portion, and a main body portion formed in a bag shape having self-supporting properties, and a columnar reinforcing material made of a thermoplastic resin and attached to the main body portion. In the packaging bag,
The reinforcing material covers at least a part of a side edge bonding portion formed on a side edge of the main body portion, and the pair of side sheets protrude from the side edge bonding portion to the center side of the main body portion. A packaging bag characterized in that the side edge adhesive portion adjacent to the protruding adhesive portion is covered with the reinforcing material in the width direction of the main body portion. The protruding adhesive portions are formed in the same shape one by one on both side edges of the main body portion, and the protruding adhesive portions on both side edges are arranged at the same height in the height direction of the main body portion,
The protruding adhesive portion is formed such that the length from the portion having the largest protruding length of the protruding adhesive portion to the lower end of the main body portion is 1/3 to 1/2 of the height of the main body portion. The packaging bag according to claim 1.   The said protruding adhesion part is formed so that it may occupy 1/15 to 1/5 of the width | variety of the said main-body part in the part in which this protrusion adhesion part is formed. Packaging bag as described in.   The packaging bag according to any one of claims 1 to 3, wherein the protruding adhesive portion is protruded so as to form a semicircular shape.   The main body is composed of a bottom sheet folded in half and a pair of side sheets sandwiching the bottom sheet, and the bottom sheet and the side sheets are bonded by a bottom edge bonding portion formed to be recessed in an arc shape. And the height at both side ends of the bottom edge adhesion portion is formed to be 24 to 34% of the width of the main body portion in the portion where the bottom edge adhesion portion is formed. The packaging bag according to any one of claims 1 to 4.

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