JP2015137130A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag capable of suppressing absorption of flavor components and medicinal components of a content to a sealant layer, and capable of being easily opened.SOLUTION: The packaging bag is formed by sealing a laminate sheet 1, which is obtained by laminating at least a base material layer 2, a gas barrier layer 4 and a sealant layer 5 in this order, so that the sealant layer is an inner surface. The sealant layer 5 comprises a resin composition obtained by mixing a polypropylene resin of a homo type having a density of 0.850 g/cmor more to a linear low density polyethylene resin, and the mixing ratio of the polypropylene is 10-30 wt.%.

Description

  The present invention relates to an easy-open packaging bag having a fragrance retention property, and more particularly to a packaging bag in which a decrease in aroma components and medicinal components of contents is suppressed.

  Conventionally, as a packaging container for storing contents such as food, beverages, and pharmaceuticals, for example, a packaging bag made of a laminated film in which a gas barrier layer and a sealant layer are laminated in order on a base layer made of film or paper is widely used. ing. In particular, the aroma components of food are not only deteriorated by oxygen gas, but are also absorbed and absorbed into the material of the packaging bag or lost through the packaging bag, leading to deterioration of the quality of the food. ing.

  A gas barrier layer is laminated in order to suppress a decrease in aroma components and medicinal components. As the gas barrier layer, an ethylene / vinyl alcohol copolymer film, an aluminum foil, or a film having an aluminum vapor deposition layer or an inorganic oxide vapor deposition layer is used. The gas barrier layer keeps the aroma.

  However, there is a problem that the aromatic component and medicinal component of the contents are adsorbed on the sealant layer in contact with the contents, that is, the polyolefin film, and as a countermeasure, a method of thinning the sealant layer or a polyester film is used. The method of use and the method of preventing powder from being dispersed in the sealant layer have been studied.

  However, the thinning of the sealant layer has a problem in that the rigidity of the packaging bag, the drop strength, and the like are reduced due to a decrease in the sealing strength. Moreover, when using a polyester-type film for a sealant layer, a high sealing temperature is required and there is a problem that the sealing strength varies. Further, the method of dispersing the powder in the sealant layer increases the production cost and has a problem of adversely affecting the seal strength.

  There is a proposal of a packaging bag that suppresses adsorption of aroma components and medicinal components of contents to a sealant layer and has easy opening (Patent Document 1). This is because the sealant layer is an ethylene / vinyl alcohol copolymer resin alone having an ethylene copolymerization ratio of 25 to 60 mol%, or 50% by weight or more of the ethylene / vinyl alcohol copolymer resin, a polyethylene resin, an ionomer resin, It is a mixture of polyamide resin or polyester resin less than 50% by weight, and the interlayer adhesive strength between the seal layer and the adjacent resin layer is made smaller than the interlayer adhesive strength between the adjacent resin layer and the base material layer and the seal strength between the seal layers. Pillow packaging bag.

  In particular, the interlayer adhesive strength between the sealant layer and the adjacent resin layer is made smaller than the interlayer adhesive strength between the adjacent resin layer and the base material layer and the seal strength between the sealant layers, and the sealant layer is adjacent to the sealant layer by pulling one end. The delamination occurs between the resin layers, and the sealant layer is cut and opened at the seal edge. However, there is a problem that it is difficult to manage the interlayer adhesive strength between the sealant layer and the adjacent resin layer.

  Therefore, there is a demand for a packaging bag that can suppress the adsorption of aroma components and medicinal components of the contents to the sealant layer and can be easily opened.

JP 2000-203635 A

  This invention is made | formed in view of such background art, and it is providing the packaging bag which suppresses adsorption | suction to the sealant layer of the aromatic component of a content, and a medicinal component, and can be opened easily.

  In order to solve the above-mentioned problems, the inventors have conducted intensive studies and completed the present invention.

The invention according to claim 1 of the present invention is a packaging bag formed by sealing at least a laminated sheet in which a base layer / gas barrier layer / sealant layer are laminated in order, with the sealant layer as an inner surface,
The sealant layer is composed of a resin composition in which a linear low density polyethylene resin is blended with a homotype polypropylene resin having a density of 0.850 g / cm ³ or more,
The packaging bag is characterized in that the blending ratio of the polypropylene resin is in the range of 10 to 30% by weight.

The invention according to claim 2 of the present invention is characterized in that the sealant layer is composed of a two-layer coextruded laminated film of a polyethylene resin having a density of 0.910 g / cm ³ or more and the resin composition. It is a packaging bag of description.

  The invention according to claim 3 of the present invention is characterized in that the gas barrier layer is any one of an aluminum foil, a film having an aluminum vapor deposition film, and a film having an inorganic oxide vapor deposition film. It is a packaging bag of description.

  The invention according to claim 4 of the present invention is the packaging bag according to claim 3, wherein the inorganic oxide is aluminum oxide or silicon oxide.

  The packaging bag of this invention suppresses adsorption | suction to the sealant layer of the fragrance | flavor component and medicinal component of the content, and has easy openability.

The sealant layer is composed of a resin composition in which a homopolypropylene resin having a density of 0.850 g / cm ³ or more is blended with a linear low density polyethylene resin, and the blending ratio of the polypropylene resin is in the range of 10 to 30% by weight. By being, it can suppress adsorption | suction of the aromatic component and medicinal component of the content to a sealant layer.

Moreover, since a linear low density polyethylene resin and a homotype polypropylene resin with a density of 0.850 g / cm ³ or more have a sea-island structure, an easy peel property can be exhibited at the time of peeling.

Moreover, the sealant layer can be formed into a plurality of layers. It is also possible to form a two-layer coextrusion laminated film of a polyethylene resin layer having a density of 0.910 g / cm ³ or more and a resin composition layer. By forming a two-layer coextrusion laminated film, the sealant layer can be stably formed.

  Further, when the gas barrier layer is any one of an aluminum foil, a film having an aluminum vapor deposition film, and a film having an inorganic oxide vapor deposition film, excellent gas barrier properties, that is, oxygen barrier properties can be obtained. Moreover, a metal detector can be used by a foreign substance test | inspection by using the film which had the vapor deposition film of the inorganic oxide. In addition, when the inorganic oxide is aluminum oxide or silicon oxide, an excellent gas barrier property and productivity can be obtained.

It is explanatory drawing which shows an example of the cross section of the lamination sheet which forms the packaging bag of this invention. It is explanatory drawing which shows an example of the cross section of the sealant layer of the lamination sheet of FIG. It is explanatory drawing which shows an example of the state which has peeled the seal | sticker part. It is explanatory drawing which shows an example of the pillow type packaging bag of this invention. It is explanatory drawing which shows an example of the gusset type packaging bag of this invention. It is explanatory drawing which shows an example of the self-supporting type packaging bag of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail.

  Drawing 1 is an explanatory view showing an example of the section of the lamination sheet which forms the packaging bag of the present invention. In the laminated sheet 1, a base material layer 2 / adhesive layer 3 / gas barrier layer 4 / adhesive layer 3 / sealant layer 5 are laminated in order. A gas barrier layer 4 is laminated in the middle so that the contents are not deteriorated by oxygen gas. The sealant layer 5 is one that suppresses the adsorption of aroma components and medicinal components of the contents, and also has an easy peel property.

FIG. 2 is an explanatory view showing an example of a cross section of the sealant layer of the laminated sheet of FIG. The sealant layer 5 is composed of a resin composition 9 in which a linear low density polyethylene resin 6 is blended with a homotype polypropylene resin 7 having a density of 0.850 g / cm ³ or more. The polypropylene resin 7 has a sea-island structure. By having a sea-island structure, the sealant layer 5 can exhibit an easy peel property, that is, can have an easy-open property. FIG. 2-2 shows an example of a film in which the sealant layer 5 is a two-layer coextrusion laminated film. It is a two-layer coextrusion laminated film comprising a low density polyethylene resin 8 having a density of 0.910 g / cm ³ or more and a resin composition 9. Thus, by forming a laminated film, it can form stably. In this case, the layer made of the resin composition is disposed on the contents side, that is, on the seal side.

FIG. 3 is an explanatory diagram illustrating an example of a state where the seal portion is peeled off. The sealant layer 5 is composed of a resin composition 9 in which a linear low density polyethylene resin 6 is blended with a homotype polypropylene resin 7 having a density of 0.850 g / cm ³ or more. The polypropylene resin 7 is in a sea-island structure. The linear low density polyethylene resin 6 exhibits a strong sealing strength, and the polypropylene resin 7 exhibits an easy peel property at the time of peeling. A state 10 in which the sealant layers 5 and 5 of the two laminated sheets 1 and 1 are sealed and then the seal portion is peeled off is shown. Since the sealant layers 5 and 5 have a sea-island structure, the sealed sealant layers 5 and 5 cause cohesive failure and are easily peeled. That is, it shows easy peelability. Reference symbol F indicates the direction of pulling.

  FIG. 4 is an explanatory view showing an example of a pillow type packaging bag of the present invention. The end portions of the single laminated sheet 1 are aligned and the sealant layers are overlapped and sealed to form a back seal portion 23 to form a cylinder. Next, after sealing the cylindrical lower end portion to form the ground seal portion 22 and filling the contents from the opening, the upper end portion is sealed to form the top seal portion 21, and a general pillow type packaging A bag is formed.

  FIG. 5 is an explanatory view showing an example of a gusset type packaging bag of the present invention. The front and back laminated sheets 1 and 1 and the two side tapes 31 and 31 made of the laminated sheet are folded between both sides of the front and back laminated sheets 1 and 1, respectively. The side seal portion 32 is formed by sealing the end portions while sandwiching them, the ground seal portion 22 is formed at the lower end portion, and after filling the contents, the upper end portion is sealed to form the top seal portion 21. A typical gusset-type packaging bag 30 is formed.

  FIG. 6 is an explanatory view showing an example of a self-supporting type packaging bag of the present invention. The bottom sheet 41 includes two laminated sheets 1 and 1 and a bottom tape 41 made of the laminated sheet, and the bottom tape 41 is sandwiched between the bottom and bottom parts of the two laminated sheets 1 and 1 while being folded. Are sealed to form the bottom seal portion 42, the end portions on both sides are sealed to form the side seal portions 32, and after filling the contents, the upper end portion is sealed to form the top seal portion 21. A self-supporting type packaging bag 40 is formed. One side seal portion is provided with a notch 50 for easy cutting.

  Furthermore, the form for implementing this invention is demonstrated.

  As the base material layer 2, a plastic film, paper, nonwoven fabric, or the like can be used. Examples of the plastic film include polyester films such as polyethylene terephthalate films and polyethylene naphthalate films, polyolefin films such as polypropylene, polystyrene films, polyamide films such as 6-nylon, polycarbonate films, polyacrylonitrile films, and polyimide films. There is no particular limitation as long as it has mechanical strength and dimensional stability. A biaxially stretched film is particularly preferable.

  Moreover, a printing layer can be appropriately provided on the base material layer 2 as necessary. The printing layer is made of ink made by adding various pigments, extender pigments, plasticizers, desiccants, stabilizers, etc. to conventionally used binder resins such as urethane, acrylic, nitrocellulose, and rubber. It is a composed layer. Characters, designs, etc. can be formed by this print layer. As the printing method, for example, known printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, and ink jet printing can be used. Moreover, the adhesiveness of a printing layer can be improved by performing the corona treatment or the ozone treatment on the surface of a base material layer as a pretreatment beforehand.

  As the gas barrier layer 4, an aluminum foil, a film having an aluminum vapor deposition film, a film having an inorganic oxide vapor deposition film, or the like can be used. For example, what formed the aluminum vapor deposition film or the inorganic oxide vapor deposition film in stretched films, such as a polyester film, a polypropylene film, and a nylon film, can be used. An ethylene / vinyl copolymer film can also be used. The thickness of the film is preferably in the range of 6 to 25 μm. In addition, a film having an aluminum foil or an aluminum vapor deposition film cannot use a metal detector for foreign matter inspection, but a form having an inorganic oxide vapor deposition film can use a metal detector for foreign matter inspection.

  As the inorganic oxide, metal oxides such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide can be used. . Of these, silicon oxide and magnesium oxide are preferable in terms of productivity and price. The thickness of the vapor-deposited layer of inorganic oxide is preferably in the range of 5 to 300 nm, and more preferably in the range of 5 to 100 nm. The value may be selected as appropriate. Further, the direction of the vapor deposition surface may be either the base material layer side or the sealant layer side.

As the adhesive for the adhesive layer 3, an adhesive for dry lamination is used. Two-component curable urethane adhesives, polyester urethane adhesives, polyether urethane adhesives, acrylic adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and others can be used. As a method of bonding using an adhesive, a dry laminating method is possible.

  In particular, among the above-mentioned adhesives, two-component curable adhesives that are difficult to decrease due to excellent adhesive force and chemical components of the contents are mainly used. For example, a two-component curable adhesive composed of an organic polyol and a polyfunctional polyisocyanate can be mentioned. The two-component curable adhesive is composed of a main agent and a curing agent. For example, as the main agent, isophthalic acid, adipic acid, sebacic acid and the like, and an ester compound composed of ethylene glycol, neopentyl glycol, 1,6 hexanediol, Examples include polyester / urethanediol resins composed of isophorone diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, etc., and those that further contain a silane coupling agent or an epoxy resin. Curing agents include trimethylolpropane and isophorone diisocyanate, xylylene. Examples thereof include those composed of range isocyanate, hexamethylene diisocyanate, and the like. In particular, by using it as an adhesive for bonding a gas barrier layer and a sealant layer, adsorption of aroma components and medicinal components of the contents can be suppressed. This prevents the adhesive strength from decreasing and maintains the laminate strength.

The sealant layer 5 is composed of a resin composition in which a homopolypropylene resin having a density of 0.850 g / m ³ or more is blended with a linear low density polyethylene resin, and the blending ratio of the polypropylene resin is 10 to 30% by weight. By being within the range, adsorption of the aromatic component and medicinal component of the contents to the sealant layer can be suppressed. That is, it can have a fragrance retention property. Moreover, appropriate seal strength and easy peelability can be provided at the same time. When the blending ratio of the polypropylene resin is less than 10% by weight, the sealing strength is increased and the easy peel property is deteriorated. Moreover, when a compounding ratio exceeds 30 weight%, when forming a sealant layer, thickness may not be obtained uniformly. By setting the blending ratio of the above polypropylene resin in the range of 10 to 30% by weight, it has film-forming properties, can obtain proper seal strength and easy peel properties, and has aroma components and medicinal components of the contents. Adsorption to the sealant layer can be suppressed.

The sealant layer 5 can be formed by a single layer or a two-layer coextrusion laminated film. In the case of a single layer, at least 5 μm or more is required. It is also possible to form a two-layer co-extrusion laminated film of the resin composition and a polyethylene resin having a density of 0.910 g / cm ³ . The laminated film can be made into two layers by a co-extrusion machine. The thickness of the laminated film needs to be at least 15 μm.

  Using the laminated sheet thus formed, a bag is formed into a desired shape to form a packaging bag. For example, a pillow-type packaging bag, a caseette-type packaging bag, a self-standing type packaging bag, or the like can be formed according to the purpose. It can be determined as appropriate from the design of the packaging bag, the content and ease of use.

  Examples of the contents include foods having fragrant coffee powder, beans, black tea, tea leaves, foods having medicinal ingredients, juices, coffee, tea, tea drinks, and the like. Suitable for these contents.

  Examples of aroma components and medicinal components include furan compounds such as furfural and furfuryl methyl sulfide, pyrazine compounds such as ethylpyrazine and 2-methylpyrazine, p-menthane, pinene, d-limonene, myrcene, terpinene, Terpenic hydrocarbon compounds such as caren, sapinene, β-cariolefin, terpene alcohol compounds such as geraniol, nerol, citronellal, terpineol, linalol, menthol, nerolidol, borneol, or esters thereof, citral, citronellal, etc. Esthetic compounds such as terpene aldehyde compounds, alcohol compounds such as octal, benzyl alcohol and eugenol, caproic acid ethyl ester, benzoic acid amyl ester and cinnamic acid ethyl ester Compounds such as Le acids, and others.

  Hereinafter, specific examples of the present invention will be described.

  A polyester film of 12 μm was used as the base material layer. Gravure printing was performed on the inner surface of the polyester film using urethane-based ink to print characters and pictures.

  Next, a polyester film 12 μm and an aluminum foil 7 μm were bonded as a gas barrier layer via a two-component curable urethane adhesive. The bonding method was a dry lamination method.

  Next, the printing surface of the base material layer and the polyester film surface of the gas barrier layer were bonded together via a two-component curable urethane adhesive. The bonding method was a dry lamination method.

Next, as a sealant layer, a resin composition in which a linear low-density polyethylene resin having a density of 0.911 g / cm ³ (90% by weight) and a homo-type polypropylene resin having a density of 0.900 (10% by weight) are blended, A linear low-density polyethylene resin having a density of 0.911 g / cm ³ was bonded to the surface of the aluminum foil while forming a two-layer co-extruded laminated film with a co-extruder. In the laminated film, the thickness of the layer made of the resin composition was 20 μm, and the thickness of the extruded linear low density polyethylene film was 30 μm. The total thickness was 50 μm. In addition, at the time of bonding, it bonded together using the two-component curable urethane adhesive as an anchor coat on the aluminum foil surface.

  In this way, a laminated sheet was prepared. The layer structure of the laminated sheet is polyester film 12 μm / printing layer / adhesive layer / polyester film 12 μm / adhesive layer / aluminum foil 7 μm / anchor coating agent / linear low density polyethylene film 30 μm / sealant layer 20 μm.

  The laminated sheet was slit to a predetermined width, placed on a bag making machine, and a predetermined area was sealed to produce a gusset type packaging bag as shown in FIG. A gusset type packaging bag having an internal capacity of 17 g was prepared. The top seal part is not sealed to fill the contents.

  Next, from the upper end of the packaging bag, 170 g of coffee powder was filled in a nitrogen atmosphere, and the top part was sealed to form a top seal part. A gusset-type packaging bag containing coffee powder was prepared.

As the sealant layer, a resin composition in which a linear low density polyethylene resin (80% by weight) with a density of 0.911 g / cm ^{3 and} a homo type polypropylene resin (20% by weight) with a density of 0.900 g / cm ³ was blended. Except that, a laminated sheet was produced in the same manner as in Example 1. Next, the laminated sheet was formed into a bag in the same manner as in Example 1 to prepare a gusset type packaging bag containing coffee powder.

As the sealant layer, a resin composition containing a linear low density polyethylene resin (70% by weight) with a density of 0.911 g / cm ^{3 and} a homo type polypropylene resin (30% by weight) with a density of 0.900 g / cm ³ was prepared. Except that, a laminated sheet was produced in the same manner as in Example 1. Next, the laminated sheet was formed into a bag in the same manner as in Example 1 to prepare a gusset type packaging bag containing coffee powder.

  Hereinafter, specific comparative examples of the present invention will be described.

<Comparative Example 1>
As the sealant layer, a resin composition in which a linear low density polyethylene resin (95% by weight) having a density of 0.911 g / cm ^{3 and} a homotype polypropylene resin (5% by weight) having a density of 0.900 g / cm ³ was blended. Except that, a laminated sheet was produced in the same manner as in Example 1. Next, the laminated sheet was formed into a bag in the same manner as in Example 1 to prepare a gusset type packaging bag containing coffee powder.

<Comparative Example 2>
As the sealant layer, a resin composition containing a linear low density polyethylene resin (60% by weight) with a density of 0.911 g / cm ^{3 and} a homotype polypropylene resin (40% by weight) with a density of 0.900 g / cm ³ was prepared. Except that, a laminated sheet was produced in the same manner as in Example 1. Next, the laminated sheet was formed into a bag in the same manner as in Example 1 to prepare a gusset type packaging bag containing coffee powder.

<Comparative Example 3>
A laminated sheet was produced in the same manner as in Example 1 except that the sealant layer was made of a low density polyethylene resin having a density of less than 0.910 g / cm ³ . Next, the laminated sheet was formed into a bag in the same manner as in Example 1 to prepare a gusset type packaging bag containing coffee powder.

<Comparative Example 4>
As a sealant layer, an easy peel film 50 μm {Mitsui Chemicals Tosero Co., Ltd. A. F (registered trademark) product number 650C} was performed in the same manner as in Example 1 except that the aluminum foil of Example 1 and the two-component curable urethane-based adhesive were bonded to each other, thereby producing a laminated sheet. Next, the laminated sheet was formed into a bag in the same manner as in Example 1 to prepare a gusset type packaging bag containing coffee powder.

<Evaluation 1>
The packaging bags of Examples 1 to 3 and Comparative Examples 1 to 4 were stored at 40 ° C. for 2 months. Thereafter, the packaging bag was opened, and the sensory evaluation of the scent of the contents and the instrumental analysis of the aroma components of the coffee powder were performed.
-Sensory evaluation of fragrance: Sensory evaluation was performed by 20 people. 15/20 persons were marked with ○, which is almost equivalent to that immediately after filling. The case where 5/20 persons were almost the same as immediately after filling was marked as Δ. 0/20 persons were almost equal to those immediately after filling, and were marked with x.
The measurement of the fragrance component was performed by measuring three kinds of detected amounts of the fragrance component furan 2-methyl, 1H-pyrrole 1-methyl, and 2-furan methanol.

Table 1 shows the sensory evaluation results of fragrance and the measurement results of fragrance components.

<Evaluation 2>
・ Easy peel properties of the sealant layer were evaluated. The laminated sheets of Examples 1 to 3 and Comparative Examples 1 to 4 were sealed with the sealant layer inside. The sealing conditions were a sealing temperature of 100 to 170 ° C., a sealing time of 1 second, and a sealing pressure of 0.2 MPa. The easy peel property was evaluated as “good” when the seal temperature was in the range of 120 to 160 ° C. and the peel strength was in the range of 1 to 5 N / 15 mm. Otherwise, it was set as x. If the peel strength is less than 1 N / 15 mm, the seal strength is insufficient. In addition, if the peel strength exceeds 5 N / 15 mm, it is difficult to make easy peelability.
-The film forming property of the sealant layer was also evaluated. A film that could be uniformly formed was marked with ◯. The non-uniform thing was set as x.

Table 2 shows the evaluation results of the easy peel property of the sealant layer and the film forming property of the sealant layer.

The overall evaluation is shown in Table 3.

  From Table 1, in sensory evaluation of fragrance, in Examples 1 to 3 and Comparative Examples 1 and 2, the resin composition of the present invention was used in the sealant layer. In Comparative Examples 3 and 4, the odor sensory evaluation was not good, and a decrease in the fragrance component was also observed in the detection result of the fragrance component of coffee.

In Table 2, in the evaluation of the easy peel property and film forming property of the sealant layer, in Examples 1 to 3, the seal strength and the easy peel property were provided. However, in Comparative Example 1, the blending ratio of the homo-type polyprolene resin having a density of 0.850 g / cm ³ or more is 5% by weight, and easy peel property is exhibited in the low temperature seal, but easy peel property is difficult in the high temperature seal. Become. In Comparative Example 2, the blending ratio of the polyprolene resin is 40% by weight, and it has a sealing strength and an easy peel property. However, when the sealant layer is formed by an extruder, the thickness is not uniform. Was unsuitable for productivity.

From Table 3, in Examples 1 to 3, if the blending ratio of the homopolypropylene resin having a density of 0.850 g / cm ³ or more to the linear low density polyethylene resin is in the range of 10 to 30% by weight, the sealing temperature While ensuring a wide range of the above, it was provided with an easy peel property and a decrease in aroma components was also suppressed.

  The packaging bag of the present invention is suitable for foods that value fragrant quality such as coffee powder, beans, tea, and tea. In addition, it can be used for beverages such as confectionery, juice, coffee, soup, dairy drinks (soy milk, coffee milk, etc.), dairy products (whipped cream, etc.), alcoholic beverages (sake, shochu, plum wine, etc.). It can also be used as a non-food product in medicines, fragrances, deodorants, detergents, bathing agents, cosmetics, fragrances and the like.

DESCRIPTION OF SYMBOLS 1 Laminated sheet 2 Base material layer 3 Adhesive layer 4 Gas barrier layer 5 Sealant layer 6 Linear low density polyethylene resin 7 Homotype polypropylene resin with a density of 0.850 g / cm ³ or more 8 Density 0.910 g / cm ³ or more polyethylene resin 9 Resin composition 10 State where seal part is peeled 20 Packaging bag of the present invention (pillow type packaging bag)
21 Top seal part 22 Ground seal part 23 Back seal part 30 Packaging bag of the present invention (Gazette type packaging bag)
31 side tape 32 side seal part 40 Packaging bag of the present invention (self-standing type packaging bag)
41 Bottom tape 42 Bottom seal part 50 Notch F Peeling direction

Claims (4)

At least a laminated sheet in which a base material layer / gas barrier layer / sealant layer are laminated in order, the sealant layer as an inner surface and a packaging bag formed by sealing,
The sealant layer is composed of a resin composition in which a linear low density polyethylene resin is blended with a homotype polypropylene resin having a density of 0.850 g / cm ³ or more,
A packaging bag, wherein a blending ratio of the polypropylene resin is in a range of 10 to 30% by weight. The sealant layer, density 0.910 g / cm ³ or more packaging bag according to claim 1, wherein the two layers co-extruded laminated film of polyethylene resin and the resin composition.   The packaging bag according to claim 1 or 2, wherein the gas barrier layer is any one of an aluminum foil, a film having an aluminum vapor deposition film, and a film having an inorganic oxide vapor deposition film.   The packaging bag according to claim 3, wherein the inorganic oxide is aluminum oxide or silicon oxide.