JP2014005013A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag obtained by a dry lamination of a gas barrier layer and a sealant layer via an adhesive so as to prevent adsorption of a flavor component and a pharmaceutical component of a content by an adhesive, and transference of a low-molecular-weight substance derived from the adhesive to the content.SOLUTION: A packaging bag is formed by sealing a laminate film including a base material layer, a first adhesive layer, a gas barrier layer, a second adhesive layer and a sealant layer laminated successively in this order, with the sealant layer as an inner surface, so as to form a seal portion, the second adhesive layer not being laminated on the portion other than the seal portion.

Description

  The present invention relates to a packaging bag for storing food, beverages, medicines, and the like. In particular, the present invention relates to a packaging bag that suppresses the taste of the contents and the quality of the fragrance.

  Conventionally, as packaging containers for storing contents such as foods, beverages, and pharmaceuticals, for example, packaging bags made of a laminated film in which a gas barrier layer and a sealant layer are sequentially laminated on the inner surface of a base layer made of film or paper are widely used. It is used. A gas barrier layer is laminated in order to suppress the deterioration of the quality of aroma components and medicinal components. In particular, taste and aroma in foods and beverages have been a major issue related to commercial value.

  However, there is a problem that the fragrance component and medicinal component of the contents are adsorbed on the sealant layer made of polyolefin resin such as polyethylene resin, and as a countermeasure, a method of thinning the sealant layer or a powder in the sealant layer A method of dispersing the body, a method of using a polyester film, a method of coating the whole surface or part-coating a sealant as a sealant layer have been studied.

However, the thickness of the sealant layer is also limited to 15 μm with a normal polyethylene resin, and it is difficult to largely suppress adsorption. Further, the method of coating the whole surface or part-coating with a sealant as a sealant layer requires an application amount of 5 g / m ² or more to suppress the adsorption amount, and there is a limit to reducing the adsorption amount. Moreover, when using a polyester-type film, high sealing temperature is required and there exists a problem of variation in seal strength. At present, various efforts are made to suppress adsorption to the sealant layer as much as possible.

  On the other hand, there is a problem that the adhesive used for the laminated film constituting the packaging bag adsorbs the aromatic component and medicinal component of the contents. At the same time, there is a problem of migration of the low molecular weight substance derived from the adhesive to the contents. In particular, the reduction of fragrance components and medicinal components and the transfer of low molecular weight substances derived from adhesives to the contents have a problem that the taste and aroma of the contents are remarkably changed and the quality is greatly reduced.

  In order to laminate the gas barrier layer and sealant layer of a laminated film, there are a wide variety of methods such as a method of extruding and laminating a sealant layer via an anchor coat agent (adhesive), and a method of dry laminating a previously prepared sealant film via an adhesive. It is used. Because of its excellent adhesive strength, it is used for laminating paper, aluminum foil, plastic film, etc. In particular, the dry laminating method is widely used because of its good adhesive strength and production efficiency.

  For example, in the dry laminating method, the adhesive solution is laminated on the surface of the first base material (outer base material), and immediately after drying, the adhesive surface is uncured and somewhat tacky (tack). This is a method in which a base material (inner base material) is pressure-bonded and wound up, aged, and cured by curing an adhesive to be laminated. However, there are many cases where a low molecular weight substance remains in the adhesive, and there is a problem that the low molecular weight substance passes through the sealant layer and migrates to the contents. If it moves to the contents, the quality of taste and aroma will be greatly reduced.

  In order to solve these problems, there is a proposal that the anchor coat agent of the extrusion laminate is composed of a compound containing an isocyanate group and no alcohol group (Patent Document 1). The generation of a fine particle component resulting from a urethane compound or a polymer thereof formed by urethane bonding from an alcohol such as a polyol and an isocyanate contained in the anchor coating agent is suppressed, and the transfer to the contents is suppressed.

  However, the extrusion lamination using the anchor coating agent needs to reduce the thickness of the anchor coating agent. Even in this proposal, it is set to 1 μm or less. Some contents contain an alkaline substance, an acidic substance, a fragrance, a surfactant, and the like, so that these substances have an adverse effect on the anchor coat agent, and there is a problem of reducing the laminate strength.

  In addition, a method that does not use an adhesive has a polyolefin resin layer on a base material, and a sealant layer (polyester resin) is laminated through a modified layer formed on the surface of the polyolefin resin (Patent Document) 2). That is, the present invention proposes that a polyolefin resin surface is subjected to low-temperature plasma treatment to provide a modified layer, and then a sealant layer is extruded and laminated on the modified layer.

  However, this method requires expensive equipment such as a low-temperature plasma processing machine, and there is a problem that the production cost increases.

  There is also a proposal to suppress the migration to the content of low molecular weight substances derived from adhesives by cross-linking the inner surface of the sealant layer by electron beam irradiation after laminating by a method of dry laminating the base material layer and the sealant layer (patent) Reference 3).

  In this method, the electron beam irradiation dose is defined in the range of 10 kGy to 1000 kGy in an inert gas atmosphere. It is a proposal to increase the crosslink density of the sealant layer and suppress the migration of low molecular weight substances derived from adhesives to the contents, but the problem is that low molecular weight substances and decomposition components from the sealant layer itself will newly migrate to the contents There is.

  Therefore, in the method of laminating the gas barrier layer and sealant layer of the packaging bag via an adhesive, the content of the low molecular weight substance derived from the adhesive without adsorbing the aromatic component or medicinal component of the content to the adhesive There is a demand for packaging bags that do not shift to goods.

JP 2012-66868 A Japanese Patent Laid-Open No. 9-156043 JP 2000-127302 A

  The present invention has been made in view of such a background art, and in a method of dry laminating a gas barrier layer and a sealant layer of a packaging bag via an adhesive, to an aroma component of contents and an adhesive of a medicinal component. It is an object of the present invention to provide a packaging bag that does not adsorb and does not migrate to the contents of a low molecular weight substance derived from the adhesive.

  In order to solve the above problems, the inventors have intensively studied and completed the present invention.

According to the first aspect of the present invention, a laminated film in which a base material layer / first adhesive layer / gas barrier layer / second adhesive layer / sealant layer are sequentially laminated is sealed with the sealant layer as an inner surface. A packaging bag formed of a part,
The region other than the seal portion is a packaging bag in which the second adhesive layer is not laminated.

The invention according to claim 2 of the present invention is the packaging bag according to claim 1, wherein the gas barrier layer is a polyester film on which aluminum vapor deposition or inorganic oxide is vapor deposited.

  The invention according to claim 3 of the present invention is the packaging bag according to claim 2, wherein the inorganic oxide is silicon oxide or aluminum oxide.

  In the packaging bag of the present invention, since the second adhesive layer is not laminated in the region other than the seal portion, there is no adsorption of odor components and medicinal components to the adhesive, and low molecular weight substances in the adhesive Since there is no transfer to the contents, the taste of the contents and the quality deterioration of the scent can be suppressed.

  According to claim 1 of the present invention, since the second adhesive layer is not laminated in the region other than the seal portion of the packaging bag, there is no adsorption of the aromatic component of the contents and the medicinal component to the adhesive, and A packaging bag that does not transfer to the contents of low-molecular substances derived from adhesives can be produced. That is, since the second adhesive layer is not laminated on the laminated film on the surface in contact with the contents, the taste of the contents and the quality of the scent can be suppressed.

  According to claim 2 of the present invention, the gas barrier layer is a polyester film on which aluminum vapor deposition or inorganic oxide is vapor-deposited, so that it has excellent gas barrier properties and can maintain the taste and fragrance quality of the contents for a long time. it can.

  According to claim 3 of the present invention, since the inorganic oxide is silicon oxide or aluminum oxide, it can have excellent gas barrier properties similar to aluminum foil. Moreover, the metal detector for the foreign material inspection of the packaging bag and the packaging bag after filling can be used.

It is explanatory drawing which shows an example of the blank which forms the pillow type packaging bag of this invention. It is explanatory drawing which shows an example of the pillow type packaging bag which bag-made the blank of FIG. It is a perspective view of the pillow type packaging bag of FIG. 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 standing type packaging bag of this invention. It is explanatory drawing which shows an example of a structure of the LL 'cross section of the blank of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described.

Drawing 1 is an explanatory view showing an example of the blank which forms the pillow type packaging bag of the present invention.
The peripheral edge of the blank 1, that is, the end portions on both sides and the upper and lower end portions are each composed of a laminated film in which a second adhesive layer is laminated. The back seal planned portions 4 and 4 are formed at the ends on both sides, the top seal planned portion 2 is formed at the upper end portion, and the bottom seal planned portion 3 is formed at the lower end portion. The area other than the part to be sealed is made of a laminated film on which the second adhesive layer is not laminated. The end portions on both sides of the blank 1 are aligned and the inner surfaces are overlapped and sealed to form a back seal portion to form a cylinder. Next, the cylindrical lower end portion is horizontally sealed to form a bottom seal portion and filled with contents, and then the upper end portion is horizontally sealed to form a top seal portion to form a pillow type packaging bag.

FIG. 2 is an explanatory view showing an example of a pillow-type packaging bag in which the blank of FIG. 1 is made. The top view of a pillow type packaging bag is shown. A pillow type packaging bag 20 is shown in which a back seal portion 7 is formed vertically, a top seal portion 5 is formed at the upper end portion, and a bottom seal portion 6 is formed at the lower end portion. The laminated film on the surface 17 in contact with the contents does not have the second adhesive layer laminated.

  FIG. 3 is a perspective view of the pillow-type packaging bag of FIG. The second adhesive layer is not laminated on the laminated film on the surface 17 in contact with the contents.

  FIG. 4 is an explanatory view showing an example of a gusset type packaging bag of the present invention. It consists of two laminated films 10a and 10b on the front and back sides and two tapes 9 and 9 made of the laminated film, and the tape 9 is sandwiched between both sides of the laminated films 10a and 10b on the two sides of the front and back. Each of the parts is sealed to form an end seal part 8, and a top seal part 5 and a bottom seal part 6 are formed at the upper and lower ends, and a gusset type packaging bag 30 is formed.

  FIG. 5 is an explanatory view showing an example of a standing type packaging bag of the present invention. It consists of two laminated films 10a and 10b, and a tape 9 made of the laminated film. The tape 9 is folded between the lower and bottom portions of the laminated films 10a and 10b. The standing type packaging bag 40 can be formed by sealing to form the bottom seal portion 6, sealing the end portions on both sides to form the end seal portion 8, and then forming the top seal portion 5. At one end, a notch 18 for easy cutting is provided.

  In order to form a gusset type packaging bag and a standing type packaging bag, the planned sealing part of the two laminated films and the planned sealing part of the tape are each composed of a laminated film in which a second adhesive layer is laminated. Yes.

  FIG. 6 is an explanatory diagram showing an example of the configuration of the LL ′ cross section of the blank of FIG. 1. In the laminated film 10, the base material layer 11 / first adhesive layer 12 / gas barrier layer 13 / second adhesive layer 14 / sealant layer 15 are sequentially laminated from the outer surface side. The area | region of the seal | sticker part 16 consists of a laminated | multilayer film with which the 2nd contact bonding layer 14 was laminated | stacked. Therefore, the seal strength can be maintained. On the other hand, the surface 17 in contact with the contents is made of a laminated film on which the second adhesive layer is not laminated. There is no adsorption of the fragrance component and medicinal component of the contents to the second adhesive layer, and there is no transfer of the low molecular weight substance derived from the adhesive to the contents. can do.

  Furthermore, the form for implementing this invention is demonstrated.

  As the substrate layer, paper or plastic film 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 suitably provided in a base material layer as needed. 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 5, a stretched film such as a polyester film, a polypropylene film, or a nylon film and an aluminum foil bonded thereto, or a film obtained by depositing aluminum or an inorganic oxide on these films can be used. The thickness of the film is preferably in the range of 6 to 25 μm. The aluminum foil can range from 5 to 15 μm. However, the aluminum foil has a problem of aluminum residues in the recycling process and aluminum residues in incineration. In addition, aluminum vapor deposited has a problem that a metal detector for inspecting foreign matter cannot be used. Therefore, it is preferable to deposit an inorganic oxide that can use an excellent gas barrier property and a metal detector.

  As the inorganic oxide, metal oxides such as diatom oxide, aluminum oxide, magnesium oxide, calcium, potassium, tin, sodium, boron, titanium, lead, zirconium and yttrium 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 an adhesive for the first adhesive layer and the second adhesive layer, 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.

  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. Although what consists of range isocyanate, hexamethylene diisocyanate, etc. are mentioned, it is not limited to these.

  As the sealant layer, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ionomer, polypropylene Polyolefin resin such as can be used. These resins can be used by forming a film with an extruder. Can be used in single or multiple layers. The film thickness is preferably in the range of 10 to 30 μm.

  The method of laminating the base material layer and the gas barrier layer via the first adhesive layer is preferably a dry laminating method because of excellent adhesive strength and production efficiency. For example, an adhesive may be applied to the entire inner surface of the base material layer and dried and bonded to the gas barrier layer for lamination.

  The method of laminating the gas barrier layer and the sealant layer via the second adhesive layer is preferably a dry laminating method because of excellent adhesive strength and production efficiency. The present invention is characterized by comprising a laminated film in which a second adhesive layer is laminated in the region of the seal portion of the packaging bag, and no second adhesive layer is laminated in the region other than the seal portion. For that purpose, it is necessary to laminate | stack a 2nd contact bonding layer with a pattern. In the dry laminating method, the roll plate to which the adhesive is applied can be formed into a pattern plate. What is necessary is just to plate-making a roll plate so that an adhesive agent may be apply | coated to a seal | sticker scheduled part. The roll plate can be prepared by a corrosion method or an engraving method in the same way as making a gravure roll plate.

  By sealing the obtained laminated film, a three-sided packaging bag, a four-sided packaging bag, a pillow-type packaging bag, a caseette-type packaging bag, a standing-type packaging bag, or the like can be produced. In the packaging bag of the present invention, since the second adhesive is not laminated on the laminated film on the surface in contact with the contents, there is no adsorption of aroma components and medicinal components to the second adhesive layer, and the adhesive Since there is no transfer to the content part of the low molecular weight substance derived from, it can be effectively used for contents containing aroma components and medicinal components such as foods, beverages and pharmaceuticals.

  Specifically, the contents to be stored in the packaging bag of the present invention include foods such as strong fragrant coffee beans and powder, tea, tea leaves, foods having fragrance ingredients and medicinal ingredients, juices, coffee, tea , Beverages such as tea, and pharmaceuticals such as haps. It is particularly suitable for packaging bags for foods such as strong coffee beans, powder, tea, and tea leaves.

  Specific examples of the aromatic component include p-menthane, pinene, d-limonene, myrcene, terpinene, carene, sapinene, β-cariolefin and other terpene hydrocarbon compounds, geraniol, nerol, citronellal, terpineol, Terpene alcohol compounds such as linalol, menthol, nerolidol, borneol or their esters, terpene aldehyde compounds such as citral, citronellal, alcohol compounds such as octal, benzyl alcohol, eugenol, caproic acid ethyl ester, benzoic acid amyl ester , Compounds such as esters such as cinnamic acid ethyl ester, and others.

  Next, the manufacturing method of the packaging bag of the present invention will be described using a pillow type packaging bag as an example.

  Printing is performed on the outer or inner surface of the base material layer using printing ink. Next, a gas barrier layer is laminated on the inner surface of the base material layer via the first adhesive layer. The lamination method is performed by a dry lamination method. In this case, the entire surface of the base material layer is coated with an adhesive, and after drying, the gas barrier layer is bonded. The direction of the vapor-deposited surface of the inorganic oxide of the gas barrier layer may be either the base material layer side or the sealant layer side.

  Next, a sealant layer is laminated on the surface of the gas barrier layer via a second adhesive layer. The lamination method is performed by a dry lamination method. In this case, an adhesive is applied to the inner surface of the gas barrier layer, and after drying, it is bonded to the sealant layer. When the adhesive layer is applied, it is applied in a pattern so that the adhesive is laminated in advance on the region where the seal portion of the packaging bag is formed. The pattern of the second adhesive layer is possible if the pattern is designed in advance when the laminated film is formed because the seal portion changes depending on the shape and size of the packaging bag to be created. The formed laminated film is composed of a base material layer / first adhesive layer / gas barrier layer / second adhesive layer (pattern) / sealant layer.

  When the first adhesive and the second adhesive use a two-component reaction type adhesive, the laminated film thus prepared is preferably aged to cure the adhesive. Adhesive strength can be improved.

  The produced laminated film is slit to an appropriate width in accordance with the form and size of a predetermined packaging bag, and placed on a bag making machine in a winding roll state. A predetermined region is sealed to form a seal portion to form a packaging bag. Pillow-type packaging bags, gusset-type packaging bags, and standing-type packaging bags are possible. Moreover, if it forms a sealing part and forms a packaging bag, it will not stick to a shape.

  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, 12 μm of an aluminum-deposited polyester film was used as a gas barrier layer. The printed surface of the polyester film and the film surface of the aluminum vapor-deposited polyester film were laminated as a first adhesive layer by a dry laminating method through a polyurethane two-component curable adhesive. The adhesive was applied to the entire surface.

  Next, as a sealant layer, using a linear low-density polyethylene film 50 μm {Futamura Chemical Co., Ltd., product number LL-XMN}, through the aluminum vapor deposition surface of the gas barrier layer laminated with the base material layer and the second adhesive layer Laminated.

  Laminate film by laminating aluminum vapor-deposited surface of gas barrier layer and linear low density polyethylene film 50μm as sealant layer by dry laminating method with polyurethane two-component curable adhesive as second adhesive layer did. At this time, a roll plate coated with an adhesive was used as a pattern so as to form a blank as shown in FIG. The roll plate was prepared by engraving as in the case of creating a gravure roll plate. A laminated film winding roll in which a blank coated with the second adhesive in a pattern is continuously slit to a predetermined width, placed on a bag making machine, and formed in a seal portion in a predetermined area A pillow-type packaging bag was made. The pillow-type packaging bag was produced with a size of 12 cm in width and 32 cm in length in the bag size. The seal width was 5 mm. The top seal part is not sealed to fill the contents.

  Next, from the top part of the packaging bag, 400 g of coffee beans were filled, the top part was sealed to form a top seal part, and a pillow type packaging bag containing coffee beans was created.

  The created packaging bag is made of a laminated film in which the second adhesive layer is laminated in the areas of the back seal part, bottom seal part, and top seal part, and the second adhesive layer is laminated in areas other than the seal part. It is a pillow type packaging bag made of a laminated film that is not made. That is, it is a pillow type packaging bag in which the second adhesive layer is not laminated on the laminated film on the surface in contact with the contents.

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

<Comparative example>
A pillow type packaging bag was produced in the same manner as in the example except that the polyurethane two-component curable adhesive as the second adhesive layer was applied to the entire surface.

  The pillow type packaging bags prepared in the examples and comparative examples were stored at 40 ° C. and 65% RH for 3 months.

<Evaluation method>
Sensory evaluation was performed on the scent when the packaging bag after opening was opened. In addition, bag making machine appropriateness, filling appropriateness, and drop test were also evaluated. In addition, the suitability of the bag making machine was evaluated as x when the laminated film was curled on the bag making machine or when a problem that caused a seal failure occurred. The filling suitability was evaluated as x when the laminated film was curled on the filling machine or when a problem occurred during the top sealing, and was evaluated as o when there was no problem. In the drop test, the floor was dropped 5 times from a height of 1 m on the concrete surface and the bag was not broken, and the broken bag was marked with ◯. The n number was 5.

  The evaluation results are shown in Table 1.

The pillow type packaging bag of the example had almost the same scent at the time of opening as that immediately after filling. Moreover, in the packaging bag of the comparative example, the scent was significantly reduced immediately after filling. Since the packaging bag of the example does not adsorb the aromatic component to the adhesive and does not shift to the contents of the low molecular weight substance derived from the adhesive, it can hold a scent almost the same as that immediately after filling. It was. Also, there was no problem in bag making machine suitability, filling suitability, and drop test.

  The packaging bag of the present invention is suitable for foods that require fragrant quality such as coffee beans, powder, tea, and tea. It can also 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 Blank 2 Top seal plan part 3 Bottom seal plan part 4 Back seal plan part 5 Top seal part 6 Bottom seal part 7 Back seal part 8 End seal part 9 Tape 10 Laminated film 10a Front laminated film 10b Back laminated film 11 Base material Layer 12 First adhesive layer 13 Gas barrier layer 14 Second adhesive layer 15 Sealant layer 16 Sealing portion 17 Surface in contact with contents 18 Notch for easy cutting 20 Packaging bag of the present invention (pillow type packaging bag)
30 Packaging Bag of the Present Invention (Gazette Type Packaging Bag)
40 Packaging bag of the present invention (standing type packaging bag)

Claims (3)

A packaging bag comprising a laminated film in which a base material layer / first adhesive layer / gas barrier layer / second adhesive layer / sealant layer are sequentially laminated, the sealant layer as an inner surface, and a seal portion is formed by sealing. ,
The packaging bag, wherein the second adhesive layer is not laminated in a region other than the seal portion.   The packaging bag according to claim 1, wherein the gas barrier layer is a polyester film on which aluminum vapor deposition or inorganic oxide is vapor deposited.   The packaging bag according to claim 2, wherein the inorganic oxide is silicon oxide or aluminum oxide.