JP2024004771A - Self-standing packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-standing packaging bag which can suppress leakage of a content due to an impact when dropped and can be easily produced.

SOLUTION: A self-standing packaging bag formed by heat-sealing a pair of body parts each including a base material layer and a sealant layer and a bottom tape including the base material layer and the sealant layer and having a mountain folding part includes: a side seal part which is provided on both sides of the self-standing packaging bag and adheres the pair of body parts together; a bottom seal part which is provided at a bottom of the self-standing packaging bag and adheres the pair of body parts and the bottom tape; and a bottom inner seal part which is a region of the bottom tape and is provided along the bottom seal part in an area surrounded by the bottom seal part and the mountain folding part and partially adheres the body part to the bottom tape.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to self-supporting packaging bags.

Self-supporting packaging bags such as standing pouches are being widely adopted because they allow products to stand out on store shelves. Standing pouches are required to have heat-sealed parts that do not break and that the contents of the standing pouch do not leak even if an impact is applied, such as when the pouch is dropped. For example, in Patent Document 1, both sides of the body sheets disposed facing each other are sealed to form a side seal part, and a bottom sheet is folded inward and sealed with the body sheet to form a bottom seal part. A self-supporting packaging bag that can stand on its own by expanding its bottom sheet, in which a gap formed by an unsealed part is formed in the bottom seal part, and an air-filled part formed by press-fitting air into the gap, A self-supporting packaging bag is disclosed that is characterized by having a plurality of air enclosing portions formed therein. It is described that this self-supporting packaging bag can absorb shock when dropped and reduce breakage of the packaging bag.

JP2015-20755A

The self-supporting packaging bag described above has a problem in terms of productivity because it is necessary to fill the unsealed area with air. Therefore, there is a need for a self-supporting packaging bag that can suppress leakage of contents due to impact when dropped and can be manufactured by a simple method.

Therefore, one aspect of the present invention aims to provide a self-supporting packaging bag that can suppress leakage of contents due to impact when dropped and can be easily manufactured.

A self-supporting packaging bag according to one aspect of the present invention heat-seals a pair of main body portions each including a base material layer and a sealant layer, and a bottom tape including a base material layer and a sealant layer and having a mountain fold. The self-supporting packaging bag has a side seal section provided on both sides of the self-supporting packaging bag and adheres a pair of main body sections to each other, and a side seal section provided at the bottom of the self-supporting packaging bag. and a bottom seal portion that adheres the pair of main body portions and the bottom tape, and a region of the bottom tape that is provided along the bottom seal portion in an area surrounded by the bottom seal portion and the mountain fold portion. The present invention is a self-supporting packaging bag comprising: a bottom inner seal portion in which the main body portion is partially adhered to the bottom tape;

According to the above-mentioned self-supporting packaging bag, it is possible to suppress leakage of contents due to impact when dropped. Further, the self-supporting packaging bag can be manufactured by adding a bottom inner seal portion within the above region, and therefore can be easily manufactured.

The present inventors speculate that the reason why the above-mentioned self-supporting packaging bag is able to suppress the leakage of the contents due to impact when dropped is as follows, but is not limited to the following reasons. . In other words, if the contents of a free-standing packaging bag such as a standing pouch leak due to impact when dropped, this may be caused by peeling in the area where the side seal and bottom seal of the free-standing packaging bag overlap (intersection seal). Sometimes it is. It is thought that this peeling of the intersection seal portion is caused by momentary force being applied to the intersection seal portion during the fall. On the other hand, according to the self-supporting packaging bag according to one aspect of the present invention, since the bottom inner seal portion is provided, even if the self-supporting packaging bag is filled with contents and falls, the bottom inner seal is sealed. By preferentially peeling off the part, it becomes possible to absorb the impact of a fall and reduce the force applied to the intersection seal part. It is presumed that this suppresses peeling of the intersection seal portion, and suppresses leakage of contents due to impact when dropped.

In the self-supporting packaging bag, a distance between the bottom seal portion and the bottom inner seal portion may be 5 mm or less. By setting the distance between the bottom seal part and the bottom inner seal part to be 5 mm or less, a sufficient internal volume of the self-supporting packaging bag can be ensured, and the self-supporting packaging bag can easily stand on its own.

The self-supporting packaging bag may further include a side inner seal portion that is provided along the side seal portion and partially adheres the pair of main body portions to each other. By further providing the self-supporting packaging bag with the above-mentioned side inner seal portion, it becomes easier to suppress leakage of contents due to impact from various directions when the bag is dropped.

In the self-supporting packaging bag, a distance between the side seal portion and the inner side seal portion may be 5 mm or less. By setting the distance between the side seal portion and the side inner seal portion to be 5 mm or less, a sufficient internal volume of the self-supporting packaging bag can be ensured, and the self-supporting packaging bag can easily stand on its own.

In the self-supporting packaging bag, the side seal portion may further include an easy-to-open portion provided above an upper end of the side inner seal portion. By providing the self-supporting packaging bag with the easy-to-open processing part, the self-supporting packaging bag can be easily opened. In addition, since the easy-opening portion is provided above the upper end of the side inner seal portion, the side inner seal portion is less likely to get in the way when opening the self-supporting packaging bag.

In the self-supporting packaging bag, the bottom inner seal portion and/or the side inner seal portion may have a broken line shape, and may have a heat-sealed section and a non-heat-sealed section. . Further, the length of the heat-sealed section may be 50% or more of the total length of the heat-sealed section and the non-heat-sealed section.

In the self-supporting packaging bag, the shape of the bottom inner seal portion and/or the side inner seal portion may be polygonal, linear, wavy, arcuate, circular, or elliptical. .

According to the present invention, there is provided a self-supporting packaging bag that can suppress leakage of contents due to impact when dropped and can be easily produced.

FIG. 1 is a front view schematically showing a standing pouch according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing the configuration of the standing pouch shown in FIG. 1. FIG. FIG. 2 is a perspective view schematically showing a pair of main body parts and a bottom tape constituting the standing pouch shown in FIG. 1. FIG. FIG. 2 is a front view illustrating the bottom inner seal portion of the standing pouch shown in FIG. 1. FIG. FIG. 3 is a front view schematically showing a standing pouch according to another embodiment of the present invention. 6 is a front view illustrating a side inner seal portion of the standing pouch shown in FIG. 5. FIG.

Embodiments of the present invention will be described in detail below. Note that the present invention is not limited to the following embodiments.

<Standing pouch>
FIG. 1 is a front view schematically showing a standing pouch according to an embodiment of the self-supporting packaging bag of the present invention. FIG. 2 is a cross-sectional view schematically showing the structure of the standing pouch shown in FIG. 1. FIG. 3 is a perspective view schematically showing a pair of main body parts and a bottom tape that constitute the standing pouch shown in FIG. 1. The standing pouch 10 shown in these figures is formed by heat-sealing a pair of main body parts 1 and 2 and a bottom tape 3. The pair of main bodies 1 and 2 and the bottom tape 3 are both constructed of a laminate including at least a base layer L1 and a sealant layer L2 (see FIG. 2).

The side portion of the standing pouch 10 is composed of a side seal portion 5. The side seal portion 5 is a portion obtained by heat-sealing the pair of main body portions 1 and 2 together in the vertical direction (hereinafter also simply referred to as the vertical direction) when the standing pouch 10 is viewed from the front. The width of the side seal portion 5 is, for example, 5 to 18 mm, and may be 7 to 15 mm. When the width of the side seal portion 5 is 5 mm or more, it tends to be possible to achieve sufficient sealing strength, and when the width of the side seal portion 5 is 18 mm or less, it tends to be easy to ensure a sufficient content capacity of the standing pouch 10. It is in.

The bottom tape 3 has one mountain fold portion 3a. That is, when the standing pouch 10 stands on its own, the bottom tape 3 is arranged in an inverted V shape (see FIGS. 2 and 3). As shown in FIG. 2, the bottom portion 10a of the standing pouch 10 is constituted by bottom seal portions 6a and 6b. The bottom seal portion 6a is a portion where the bottom portion 1a of the main body portion 1 and one bottom portion 3b of the bottom tape 3 are heat-sealed in the lateral direction (hereinafter also simply referred to as the lateral direction) when the standing pouch 10 is viewed from the front. The bottom seal portion 6b is a portion obtained by heat-sealing the bottom portion 2a and one bottom portion 3c of the bottom tape 3 in the lateral direction. For example, as shown in FIG. 1, the main bodies 1 and 2 and the bottom tape 3 may be heat-sealed so that the bottom of the area for accommodating the contents forms a curved surface and the upper side forms an arc. good. The standing pouch 10 has an intersection seal portion 10b that is the intersection of the side seal portion 5 and the bottom seal portions 6a, 6b.

When viewed from the front, the standing pouch 10 has a region A (hatched region in FIG. 4) surrounded by the bottom seal portion 6a or 6b and the mountain fold portion 3a. The standing pouch 10 includes bottom inner seal portions 7a and 7b in area A. The bottom inner seal portion 7a is a portion obtained by heat-sealing the main body portion 1 and the bottom tape 3 within the region A along the bottom seal portion 6a (the boundary between the bottom seal portion 6a and the region A). The bottom inner seal portion 7b is a portion obtained by heat-sealing the main body portion 2 and the bottom tape 3 within the region A along the bottom seal portion 6b (the boundary between the bottom seal portion 6b and the region A).

The maximum length in the lateral direction of the bottom inner seal portion 7a and/or the bottom inner seal portion 7b (length La shown in FIG. 4) makes it easier to absorb the impact when dropped and to suppress leakage of contents. From the viewpoint of ease of use, it may be 70% or more, 80% or more, or 90% or more of the maximum horizontal length of region A (length Lb shown in FIG. 4). The length La is 96% or less, 93% or less, or 90% or less of the length Lb from the viewpoint of making it difficult for the contents to enter between the bottom seal part 6b and the bottom inner seal part 7b. Good too. The length La may be 70 to 96% of the length Lb.

The length La may be, for example, 100 mm or more, 115 mm or more, or 130 mm or more, or 150 mm or less, 145 mm or less, or 135 mm or less. The length La may be 100 to 150 mm.

The bottom inner seal part 7a and/or the bottom inner seal part 7b are arranged so that they overlap with the lateral center line of the area A, from the viewpoint of absorbing shock more easily when dropped and easily suppressing leakage of contents. It may be provided there. That is, even if the bottom inner seal portion 7a and/or the bottom inner seal portion 7b are provided so as to straddle the lateral center of the area A (the position of 50% of the lateral maximum length Lb of the area A), good. The bottom inner seal portion 7a and/or the bottom inner seal portion 7b may be provided so as to be approximately symmetrical with respect to a center line passing through the center of the area A in the lateral direction.

The width of the bottom inner seal part 7a and/or the bottom inner seal part 7b (the length Lc shown in FIG. 4) makes it easier to absorb the impact when dropped and to suppress leakage of contents. From this point of view, it may be 5% or more, 10% or more, or 20% or more with respect to the maximum longitudinal length of region A (length Ld shown in FIG. 4). The length Lc is 50% or less, 40% or less, or 30% or less of the length Ld from the viewpoint of ensuring sufficient internal volume of the standing pouch 10 and from the viewpoint of making the standing pouch 10 easy to stand on its own. You can. The length Lc may be 5 to 50% of the length Ld.

The length Lc may be, for example, 1 mm or more, 2 mm or more, or 4 mm or more, or 15 mm or less, 10 mm or less, or 8 mm or less. The length Lc may be 1 to 15 mm.

The distance between the bottom seal part 6a and the bottom inner seal part 7a (distance D1 shown in FIG. 4) is 10 mm or less, from the viewpoint of ensuring sufficient internal volume of the standing pouch 10 and from the viewpoint of making the standing pouch 10 easy to stand on its own. It may be 7 mm or less, or 5 mm or less. The distance D1 may be 1 mm or more, 2 mm or more, or 3 mm or more. The distance between the bottom seal portion 6b and the bottom inner seal portion 7b may satisfy the above range.

The distance from the upper end of the bottom inner seal part 7a to the mountain fold part 3a (distance D2 shown in FIG. 4) is 10 mm from the viewpoint of absorbing the impact when dropped and making it easier to suppress leakage of contents. Below, it may be 8 mm or less, or 5 mm or less. The distance D2 may be 0 mm or more, 1 mm or more, 2 mm or more, or 3 mm or more. The distance from the upper end of the bottom inner seal portion 7b to the mountain fold portion 3a may satisfy the above range.

The shape of the bottom inner seal portions 7a, b is not particularly limited, and can be determined depending on the shape of the bottom seal portion 6a (the boundary between the bottom seal portion 6a and the area A). The shapes of the bottom inner seal portion 7a and the bottom inner seal portion 7b may be substantially the same or different. The outer edges of the bottom inner seal portion 7a and the bottom inner seal portion 7b may be formed to overlap on the front and back sides of the standing pouch 10.

The standing pouch 10 may have a plurality of bottom inner seal portions in the region A. For example, when the bottom inner seal portion has a broken line shape (dotted line shape), it can be said that the standing pouch 10 has a plurality of bottom inner seal portions in the region A. The shapes of the plurality of bottom inner seal portions may be the same or different. The shape of each of the plurality of bottom inner seal portions may be, for example, any one of a polygonal shape, a linear shape, a wavy line shape, an arc shape, a circular shape, and an elliptical shape.

When the standing pouch 10 has a plurality of bottom inner seal parts in the area A, from the right end of the inner seal existing at the right end in the lateral direction among the plurality of bottom inner seal parts, to the bottom inner seal existing at the left end in the lateral direction. The length along the lateral direction (parallel to the lateral direction) to the left end of the section may satisfy the range of the above-mentioned length La, and the ratio of the length La to the above-mentioned length Lb may be It may be one that satisfies the range. When the standing pouch 10 has a plurality of bottom inner seal parts in the region A, the width of each of the plurality of bottom inner seal parts may satisfy the above range of length Lc, It may satisfy the range of the length Lc with respect to the length Ld described above. When the standing pouch 10 has a plurality of bottom inner seal portions in the area A, the distance between each of the plurality of bottom inner seal portions and the bottom seal portion 6a may satisfy the above distance D1 range. good. When the standing pouch 10 has a plurality of bottom inner seal portions in the region A, the distance from the upper end of the plurality of bottom inner seal portions to the mountain fold portion 3a may satisfy the range of the above distance D2. good.

If the inner bottom seal part has a broken line shape, the length of the heat-sealed section is determined from the viewpoint that it is easier to absorb the impact when dropped and it is easier to prevent leakage of contents. It may be 50% or more of the total length of the heat-sealed section and the non-heat-sealed section.

The standing pouch 10 can be manufactured in the same manner as a conventional standing pouch except for forming the bottom inner seal portions 7a and 7b. The bottom inner seal parts 7a, 7b may be formed under the same heat seal conditions as the side seal parts 5 and/or the bottom seal parts 6a, 6b, or may be formed under different heat seal conditions. The bottom inner seal portions 7a and 7b may be formed under heat sealing conditions, for example, at a temperature of 100 to 200° C., a time of 0.3 to 10 seconds, and a pressure of 0.1 to 1.0 MPa.

As shown in FIG. 1, the standing pouch 10 has fused portions 9 on both sides of the bottom portion 10a. In this embodiment, two fused parts 9 are formed vertically on one side of the standing pouch 10, and two fused parts 9 are formed vertically on the other side. . The fused portion 9 joins the main body portion 1 and the main body portion 2. The fused portion 9 is a portion where the sealant layers L2 of the main body portions 1 and 2 are locally fused together through the notches 8a and 8b provided in the bottom tape 3. As shown in FIG. 3, the cutout portions 8a and 8b of the bottom tape 3 are provided on the sides of the bottom tape 3 in areas between the mountain fold portion 3a and the bottom sides 3d and 3d. By providing the fused portions 9 on both sides of the bottom portion 10a, the self-sustainability and fall resistance of the standing pouch 10 can be further improved. In addition, here, although the case where two pairs of notches 8a and 8b are provided on one side of the bottom tape 3 and two fused parts 9 are formed is illustrated, for example, on one side of the bottom tape 3 A pair of notches may be provided to form one fused portion 9.

FIG. 5 is a front view schematically showing a standing pouch according to another embodiment of the self-supporting packaging bag of the present invention. The standing pouch 20 shown in FIG. 5 has a region B (hatched region in FIG. 6) sandwiched between a pair of side seal parts 5 when viewed from the front. The standing pouch 20 is provided along the side seal part 5 in the region B, and has a side inner seal part 11 that partially adheres the pair of main body parts 1 and 2 to each other. The side inner seal portion 11 is a portion of the standing pouch 10 that is heat-sealed in the vertical direction. The side inner seal portion 11 may be formed continuously with the bottom inner seal portion 7a and/or the bottom inner seal portion 7b, or may be discontinuous at the mountain fold portion 3a.

The width of the side inner seal portion 11 may be, for example, 1 mm or more, 2 mm or more, or 4 mm or more, 15 mm or less, 10 mm or less, or 8 mm or less, and 1 to 15 mm. Good too.

The distance between the side seal part 5 and the side inner seal part 11 (distance D3 shown in FIG. 6) is 10 mm or less, from the viewpoint of ensuring sufficient internal volume of the standing pouch 10 and from the viewpoint of making the standing pouch 10 easy to stand on its own. It may be 7 mm or less, or 5 mm or less. The distance D3 may be 1 mm or more, 2 mm or more, or 3 mm or more.

The distance from the upper end of the side inner seal portion 11 to the upper end of the main body portion 1 (distance D4 shown in FIG. 6) is 3% or more with respect to the maximum length in the vertical direction of region B (length Le shown in FIG. 6). , 5% or more, or 10% or more, and may be 25% or less, 20% or less, or 15% or less. The distance D4 may be 3 to 25% of the length Le.

The distance D4 may be, for example, 1 mm or more, 5 mm or more, or 12 mm or more, or 30 mm or less, 25 mm or less, or 18 mm or less.

The standing pouch 20 may have a plurality of side inner seal portions within the region B. For example, when the side inner seal portion has a broken line shape (dotted line shape), it can be said that the standing pouch 10 has a plurality of side inner seal portions within the region B. The shapes of the plurality of side inner seal portions may be the same or different. The shape of each of the plurality of side inner seal portions may be, for example, any one of a polygonal shape, a linear shape, a wavy line shape, a circular arc shape, a circular shape, and an elliptical shape.

When the inner side seal part is a broken line, the length of the heat-sealed section is determined from the viewpoint of absorbing the impact when dropped and making it easier to prevent leakage of contents. It may be 50% or more of the total length of the heat-sealed section and the non-heat-sealed section.

The side inner seal portions 11 may be formed under the same heat seal conditions as the bottom inner seal portions 7a and 7b, or may be formed under different heat seal conditions. The side inner seal portion 11 may be formed under heat sealing conditions of, for example, a temperature of 100 to 200° C., a time of 0.3 to 10 seconds, and a pressure of 0.1 to 1.0 MPa.

The standing pouch 20 includes an easy-open processing section 15. The easy-opening portion 15 may be, for example, a notch, a half cut, a stamp indicating an opening location, or the like. By providing the easy-open processing part 15, the standing pouch 20 becomes easy to open.

The easy-opening part 15 may be provided above the upper end of the side inner seal part 11. Since the easy-to-open portion 15 is provided above the upper end of the side inner seal portion 11, the standing pouch 20 can be opened more easily.

The content of polyethylene resin in the standing pouches 10 and 20 may be 90% by mass or more from the viewpoint of recyclability. From the viewpoint of achieving a higher degree of monomaterialization of the standing pouches 10 and 20, the content of the polyethylene resin in the standing pouches 10 and 20 may be 92% by mass or more, or 95% by mass or more.

<Laminated body>
The pair of main bodies 1 and 2 and the bottom tape 3 of the standing pouches 10 and 20 may each be a laminate including at least a base layer L1 and a sealant layer L2.

[Base material layer]
The base material layer L1 may be, for example, a film containing polyolefin resin or a film containing polyethylene resin. When the base material layer L1 contains a polyethylene resin, the polyethylene resin is not limited to one derived from petroleum, and a resin material in which part or all of it is biologically derived (for example, biomass polyethylene using biomass-derived ethylene as a raw material) It may be. A method for producing polyethylene resin derived from biomass is disclosed in, for example, Japanese Patent Publication No. 2010-511634. The base material layer L1 may include commercially available biomass polyethylene (green PE manufactured by Braskem, etc.), or may include mechanically recycled polyethylene made from used polyethylene products or resin (so-called burr) generated in the manufacturing process of polyethylene products. May include.

From the viewpoint of heat resistance, the base layer L1 may include a polyethylene resin having a density of 0.925 g/cm ³ or more, and may not contain a high-density polyethylene resin having a density of 0.93 to 0.98 g/cm ³ . But that's fine. The base material layer L1 may include, for example, high density polyethylene resin (HDPE), medium density polyethylene resin (MDPE), etc. as the polyethylene resin, or may be a blend thereof.

The base layer L1 may contain other components than the polyolefin resin. Other ingredients include, for example, polyamide, polyethylene terephthalate, polypropylene, polyvinyl alcohol, biodegradable resin materials (for example, polylactic acid, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, casein, modified starch). etc.). The base layer L1 may contain additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a colorant. The amount of components other than polyethylene resin in the base layer L1 may be 0 to 15% by mass, or 0 to 10% by mass, based on the total amount of the base layer L1.

The melting point of the base layer L1 may be higher than the melting point of the sealant layer L2 from the viewpoint of suppressing melting of the base layer L1 during heat sealing. The melting point of the base layer L1 may be, for example, 20°C or more higher than the melting point of the sealant layer L2, 25°C or more higher, or 30°C or more higher. The melting point of the base layer L1 may be, for example, 120°C or higher, or 125°C or higher. That is, the base material layer L1 may be composed of a polyethylene resin having a melting point of 120°C or higher, or may be composed of a polyethylene resin having a melting point of 125°C or higher. The melting point of the base layer L1 can be measured using a differential scanning calorimeter (DSC).

The thickness of the base layer L1 may be, for example, 5 to 800 μm, 5 to 500 μm, or 10 to 50 μm.

The base material layer L1 may be an unstretched film. Since the base material layer L1 is an unstretched film, there is almost no orientation of the resin, which makes it easy to stretch against external stresses such as tension and shearing, and is difficult to break. The base material layer L1 may be a single layer or may be formed of a plurality of layers.

[Sealant layer]
The sealant layer L2 may be, for example, a film containing polyolefin resin or a film containing polyethylene resin. When the sealant layer L2 includes a polyethylene resin, the polyethylene resin is not limited to one derived from petroleum, and a resin material whose part or whole is biologically derived (for example, biomass polyethylene using biomass-derived ethylene as a raw material) It may be. Such a sealant film is disclosed in, for example, Japanese Patent Application Publication No. 2013-177531. The sealant layer L2 may include mechanically recycled polyethylene made from used polyethylene products or resin (so-called burrs) generated during the manufacturing process of polyethylene products.

The sealant layer L2 may contain, as the polyethylene resin, for example, a polyethylene resin having a density of less than 0.925 g/cm ³ , or a polyethylene resin having a density of 0.90 to 0.92 g/cm ³ . The sealant layer L2 may include, as a polyethylene resin, for example, a low density polyethylene resin (LDPE), a linear low density polyethylene resin (LLDPE), a very low density polyethylene resin (VLDPE), or a blend thereof. Good too.

The sealant layer L2 may contain components other than the polyolefin resin. Other ingredients include, for example, polyamide, polyethylene terephthalate, polypropylene, polyvinyl alcohol, biodegradable resin materials (for example, polylactic acid, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, casein, modified starch). etc.). The sealant layer L2 may contain additives such as an antioxidant, a slip agent, a flame retardant, an anti-blocking agent, a light stabilizer, a dehydrating agent, a tackifier, a crystal nucleating agent, and a plasticizer. The amount of components other than polyethylene resin in the sealant layer L2 may be 0 to 15% by mass, or 0 to 10% by mass, based on the total amount of the sealant layer L2.

The melting point of the sealant layer L2 may be lower than the melting point of the base layer L1 from the viewpoint of melting the sealant layer L2 preferentially than the base layer L1 during heat sealing. The melting point of the sealant layer L2 may be, for example, 20° C. or more lower than the melting point of the base material layer L1, 25° C. or more lower, or 30° C. or more lower. The melting point of the sealant layer L2 may be 120°C or lower, or 110°C or lower. The melting point of the sealant layer L2 may be 95° C. or higher. That is, the sealant layer L2 may be made of a polyethylene resin having a melting point of 120°C or less, or may be made of a polyethylene resin having a melting point of 110°C or less. The melting point of the sealant layer L2 can be measured using a differential scanning calorimeter (DSC).

The thickness of the sealant layer L2 may be, for example, 40 to 150 μm or 20 to 250 μm.

(Other layers)
The laminate may further include an adhesive layer (not shown) between the base layer L1 and the sealant layer L2. The adhesive forming the adhesive layer can be selected depending on the bonding method, and urethane adhesives, polyester adhesives, etc. can be used. By providing such an adhesive layer, the adhesion between the base material layer L1 and the sealant layer L2 is increased, delamination becomes difficult to occur, and pressure resistance and impact resistance are further improved.

Preferably, the adhesive layer does not contain chlorine. Since the adhesive layer does not contain chlorine, it is possible to suppress the adhesive forming the adhesive layer, the recycled resin, etc. from being colored, and the generation of odor due to heat treatment. From the viewpoint of environmental considerations, the adhesive layer may be formed of a biomass material and may not contain a solvent.

The laminate may further include a gas barrier layer, for example, from the viewpoint of improving gas barrier properties against water vapor and oxygen. The gas barrier layer may be provided between the base material layer L1 and the sealant layer L2, or may be provided on the surface of the base material layer L1 opposite to the sealant layer L2. By including the gas barrier layer in the laminate, deterioration of the contents due to water vapor and oxygen is suppressed, making it easier to maintain quality over a long period of time.

An example of the gas barrier layer is a vapor-deposited layer of an inorganic oxide. By using a vapor-deposited layer of an inorganic oxide, high barrier properties can be obtained with a very thin layer that does not affect the recyclability of the laminate. Examples of inorganic oxides include aluminum oxide, silicon oxide, magnesium oxide, and tin oxide. From the viewpoint of transparency and barrier properties, the inorganic oxide may be selected from the group consisting of aluminum oxide, silicon oxide, and magnesium oxide. The thickness of the deposited layer of inorganic oxide may be, for example, 5 to 100 nm or 10 to 50 nm. When the thickness of the inorganic oxide vapor deposition layer is 5 nm or more, it is easy to obtain excellent barrier properties, and when the inorganic oxide vapor deposition layer is 100 nm or less in thickness, it is easy to maintain the flexibility of the laminate. . The vapor deposition layer can be formed by, for example, physical vapor deposition, chemical vapor deposition, or the like.

The laminate may include a metal layer (metal foil) instead of or in addition to the vapor-deposited layer of inorganic oxide. As the metal layer, various metal foils made of aluminum, stainless steel, etc. can be used, and aluminum foil may be used from the viewpoints of workability such as moisture resistance and spreadability, and cost. As the aluminum foil, a soft aluminum foil can be used. The aluminum foil may contain iron from the viewpoint of excellent pinhole resistance and extensibility during molding. The thickness of the metal layer may be 7 to 50 μm or 9 to 15 μm from the viewpoint of barrier properties, pinhole resistance, processability, and the like.

The laminate may include an anchor coat layer between the base layer L1 and the sealant layer L2. The anchor coat layer can be formed using an anchor coat agent. Examples of the anchor coating agent include acrylic resin, epoxy resin, acrylic urethane resin, polyester polyurethane resin, polyether polyurethane resin, and polyvinyl alcohol resin. The anchor coating agent may be at least one of an acrylic urethane resin and a polyester polyurethane resin from the viewpoint of heat resistance and interlayer adhesive strength. The anchor coat layer may be a very thin layer that does not affect the recyclability of the laminate.

The laminate may further include a printed layer. The printing layer may be provided between the base material layer L1 and the sealant layer L2, or may be provided on the surface of the base material layer L1 opposite to the sealant layer L2. The printed layer does not need to contain chlorine from the viewpoint of suppressing coloring and generation of odor when the printed layer is remelted. The printing layer may be formed from a biomass material from the viewpoint of environmental consideration.

The content of polyethylene resin in the laminate is 90% by mass or more, 92% by mass or more, or 95% by mass or more based on the total amount of the laminate, from the viewpoint of realizing monomaterialization and facilitating resin recycling. There may be.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. The standing pouch according to one embodiment can be used as a refill pouch for shampoo, hand soap, detergent, etc., and a food pouch for soup, seasoning, etc.

The present invention relates to the following inventions, for example.
(1) A self-supporting packaging bag formed by heat-sealing a pair of main bodies each containing a base material layer and a sealant layer, and a bottom tape containing a base material layer and a sealant layer and having a mountain fold. hand,
side seal portions provided on both sides of the self-supporting packaging bag and bonding the pair of main body portions together;
a bottom seal portion provided at the bottom of the self-supporting packaging bag and bonding the pair of main body portions and the bottom tape;
A region of the bottom tape is provided along the bottom seal portion in an area surrounded by the bottom seal portion and the mountain fold portion, and is provided along the bottom seal portion in a region of the bottom tape that is A self-supporting packaging bag comprising: an adhesive bottom inner seal portion;
(2) The self-supporting packaging bag according to (1), wherein the distance between the bottom seal part and the bottom inner seal part is 5 mm or less.
(3) The self-supporting packaging according to (1) or (2), further comprising a side inner seal portion that is provided along the side seal portion and partially adheres the pair of main body portions to each other. bag.
(4) The self-supporting packaging bag according to (3), wherein the distance between the side seal portion and the side inner seal portion is 5 mm or less.
(5) The self-supporting packaging bag according to (3) or (4), wherein the side seal portion further includes an easy-open processing portion provided above the upper end of the side inner seal portion.
(6) Any of (3) to (5), wherein the bottom inner seal portion and/or the side inner seal portion has a broken line shape and includes a heat-sealed section and a non-heat-sealed section. Self-supporting packaging bag described in Crab.
(7) The length of the heat-sealed section is 50% or more of the total length of the heat-sealed section and the non-heat-sealed section. Freestanding packaging bag.
(8) The shape of the bottom inner seal portion and/or the side inner seal portion is any one of a polygonal shape, a linear shape, a wavy line shape, an arc shape, a circular shape, and an elliptical shape, (3) to (7) ).

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the following Examples.

(Example 1)
High-density polyethylene film (thickness: 40 μm, density: 0.950 g/cm ³ ) / Printing layer / High-density polyethylene film (thickness: 30 μm, density: 0.9508 g/cm ³ ) / Linear low-density polyethylene film (thickness: 80 μm, density: 0.913 g/cm ³ ) was prepared in this order. In addition, a bottom tape comprising high-density polyethylene film (thickness: 40 μm, density: 0.950 g/cm ³ )/linear low-density polyethylene film (thickness: 80 μm, density: 0.913 g/cm ³ ) in this order. A film was produced.

Fold the bottom tape film (150 mm width x 82 mm length rectangle) into an inverted V shape so that the length in the vertical direction (minor axis direction) is halved, and make the main body film (150 mm width x 230 mm length rectangle). / Inverted V-shaped bottom tape film (150 mm wide x 41 mm long rectangle) / main body film (150 mm wide x 230 mm long rectangle) are laminated in this order, and both ends of the main body film and the bottom tape film in the horizontal direction, With the lower ends in the vertical direction aligned, both ends in the horizontal direction and the lower end in the vertical direction were heat-sealed at 150° C., 0.3 seconds, and 0.2 MPa to form a side seal portion and a bottom seal portion. Next, in a front view of the heat-sealed laminate, in the area surrounded by the bottom seal part and the mountain fold part of the bottom tape film, the inner surface of the main body film and the bottom tape film are aligned along the bottom seal part. The inner surface of the laminate was heat-sealed under the conditions of 150° C., 0.3 seconds, and 0.2 MPa to form bottom inner sealed portions on both sides of the laminate. The bottom inner seal part had a U-shape with a distance of 4 mm from the bottom seal part and a width of 3 mm. Further, the maximum horizontal length of the bottom inner seal portion was 130 mm, and the distance from the upper end of the bottom inner seal portion to the mountain fold portion was 8 mm. The maximum length in the horizontal direction of the area surrounded by the bottom seal part and the mountain fold part of the bottom tape film was 140 mm, and the maximum length in the vertical direction was 35 mm.

Next, the produced heat-sealed laminate was filled with 400 mL of 5° C. water, and then the upper end of the main body film in the vertical direction was sealed by heat-sealing to produce a standing pouch containing the contents. A total of 10 standing pouches were produced in the same manner.

(Example 2)
After producing a laminate in which a side seal part and a bottom seal part were formed in the same manner as in Example 1, in a front view of the laminate, the bottom seal part The inner surface of the main body film and the inner surface of the bottom tape film or the inner surfaces of the main body films are heat-sealed along the side seal portions at 150° C., 0.3 seconds, and 0.2 MPa to form a laminate. A bottom inner seal portion and a side inner seal portion were formed on both sides. The bottom inner seal part had a U-shape with a distance of 4 mm from the bottom seal part and a width of 3 mm. Further, the maximum horizontal length of the bottom inner seal portion was 130 mm, and the distance from the upper end of the bottom inner seal portion to the mountain fold portion was 1 mm. The side inner seal portion had a linear shape with a distance of 4 mm from the side seal portion and a width of 3 mm. The maximum length in the horizontal direction of the area surrounded by the bottom seal part and the mountain fold part of the bottom tape film was 140 mm, and the maximum length in the vertical direction was 35 mm. The maximum length in the horizontal direction of the region sandwiched between the pair of side seal parts was 114 mm, and the maximum length in the vertical direction was 184 mm. Next, a total of 10 standing pouches were produced in the same manner as in Example 1.

(Comparative example 1)
A standing pouch was produced in the same manner as in Example 1, except that the bottom inner seal portion was not formed. A total of 10 standing pouches were produced in the same manner.

(Drop test)
The 10 standing pouches prepared were allowed to fall naturally from a height of 1 m to check for leakage of the contents. Similar operations were repeated up to 10 times until leakage was confirmed. Table 1 shows the results.

DESCRIPTION OF SYMBOLS 1, 2... Main body part, 1a, 2a, 3b, 3c, 10a... Bottom part, 3... Bottom tape, 3a... Mountain fold part, 3d... Bottom side, 5... Side seal part, 6a, 6b... Bottom seal part, 7a, 7b...Bottom inner seal part, 8a, 8b...Notch part, 9...Fusion part, 10, 20...Standing pouch, 10b...Intersection seal part, 11...Side inner seal part, 15...Easy opening processing part, A, B... area, L1... base material layer, L2... sealant layer.

Claims (8)

A self-supporting packaging bag formed by heat-sealing a pair of main bodies each containing a base material layer and a sealant layer, and a bottom tape containing a base material layer and a sealant layer and having a mountain fold,
side seal portions provided on both sides of the self-supporting packaging bag and bonding the pair of main body portions together;
a bottom seal portion provided at the bottom of the self-supporting packaging bag and bonding the pair of main body portions and the bottom tape;
A region of the bottom tape is provided along the bottom seal portion in an area surrounded by the bottom seal portion and the mountain fold portion, and is provided along the bottom seal portion in a region of the bottom tape that is A self-supporting packaging bag comprising: an adhesive bottom inner seal portion; The self-supporting packaging bag according to claim 1, wherein a distance between the bottom seal part and the bottom inner seal part is 5 mm or less. The self-supporting packaging bag according to claim 1, further comprising a side inner seal portion provided along the side seal portion and partially bonding the pair of main body portions to each other. The self-supporting packaging bag according to claim 3, wherein a distance between the side seal portion and the side inner side seal portion is 5 mm or less. The self-supporting packaging bag according to claim 3 or 4, wherein the side seal portion further includes an easy-to-open processed portion provided above an upper end of the side inner seal portion. The self-supporting packaging bag according to claim 3 or 4, wherein the bottom inner seal portion and/or the side inner seal portion have a broken line shape, and have a heat-sealed section and a non-heat-sealed section. . The self-supporting device according to claim 6, wherein the length of the heat-sealed section is 50% or more of the total length of the heat-sealed section and the non-heat-sealed section. packaging bag. The self-supporting device according to claim 3 or 4, wherein the shape of the bottom inner seal portion and/or the side inner seal portion is any one of a polygonal shape, a linear shape, a wavy line shape, an arc shape, a circular shape, and an elliptical shape. Sex packaging bag.

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