JPS6347622B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a composite packaging material suitable for manufacturing containers such as packaging bags for filling contents containing flavoring ingredients such as foods, soft drinks, cosmetics, etc. For example, composite packaging that can protect the aroma by reducing adsorption, permeation, and permeation of flavoring ingredients in the contents as much as possible, and that can manufacture packaging containers with high heat seal strength and impact resistance. Regarding materials. Conventional Technology and Problems to be Solved by the Invention Conventionally, packaging bags for various foods, soft drinks, cosmetics, etc. have been made using a plurality of plastic films or a composite film made by laminating plastic films and metal foils. , which are heat-sealed to form a bag-like packaging bag are widely used. However, in conventional packaging bags of this type, the innermost layer is usually made of a polyolefin resin film such as polyethylene, but the contents contained in the packaging bag are Flavoring ingredients are adsorbed to the innermost layer of this polyolefin resin,
There is a problem that permeation occurs and the permeation of flavoring ingredients is high. In addition, in the case of packaging bags laminated with metal foil such as aluminum foil to protect fragrance, there is a problem that the fragrance component permeates into the metal foil surface and causes peeling phenomenon (delamination) from the metal foil surface. There is. Packaging materials that prevent the adsorption, permeation, and permeation of such flavoring ingredients have traditionally been made of polyethylene terephthalate, ethylene-terephthalate,
It has been proposed to use a synthetic resin with a solubility index of 9.0 or higher, such as vinyl alcohol copolymer or nylon (Japanese Unexamined Patent Publication No. 163654/1983), but this material has poor heat seal strength and impact resistance. There's a problem. Additionally, the present applicant has proposed that aromatic components can be well protected by using an aromatic copolyester film in the innermost layer that is in direct contact with the contents (Japanese Patent Application Laid-open No. 48344/1983). However, even in this composite packaging material, the heat seal strength and impact tear resistance of the sealing part are not necessarily sufficient, and especially when manufacturing packaging containers with relatively large capacity, the heat seal strength and impact resistance strength are insufficient. It was hoped to increase the The present invention was developed in view of the above circumstances, and can effectively prevent the adsorption and penetration of flavoring ingredients, and therefore can be effectively used for packaging foods, soft drinks, cosmetics, etc. that contain a large amount of flavoring ingredients. It is an object of the present invention to provide a composite packaging material which can be easily manufactured by heat sealing, and which has high heat seal strength and impact resistance of the resulting packaging container. Means and Effects for Solving the Problems In order to achieve the above object, the present invention manufactures a packaging container that can be filled with a content containing a flavoring component and that can protect the aroma of the content. As a composition of a composite packaging material suitable for this purpose, the material forming the innermost layer in contact with the contents of this composite packaging material may be polyethylene terephthalate, a copolyester made by copolymerizing terephthalic acid, isophthalic acid, and ethylene glycol, or terephthalic acid. A copolyester obtained by copolymerizing and isophthalic acid and 1,4-dicyclohexanedimethanol, a copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, and propylene glycol, and a copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, ethylene glycol, and propylene glycol. The film is a mixture obtained by mixing 10 to 20 parts by weight of a nylon 6-66 copolymer with 100 parts by weight of a polyester selected from copolyesters prepared by copolymerizing. According to the present invention, since the material forming the innermost layer in contact with the contents is a film made of a mixture of the above-mentioned specific polyester and nylon 6-66 copolymer in a specific ratio, It can effectively prevent the adsorption, penetration, and permeation of flavoring ingredients and protect the aroma of the contents. Therefore, the composite packaging material of the present invention is suitable for soft drinks containing D-limonene, decanal, etc. as flavoring ingredients.
Foods and drinks containing various flavoring ingredients, cosmetics, etc., such as confectionery containing methyl salicylate, vanillin, etc., oral medicines containing anethole, menthol, etc., cosmetics containing benzaldehyde, citral, etc. It can be suitably used as a packaging container such as a packaging bag for filling the contents. In addition, the resulting packaging container has improved impact tear resistance, high heat seal strength, and high impact resistance. Hereinafter, the present invention will be explained in more detail with reference to the drawings. FIG. 1 shows an embodiment of the composite packaging material of the present invention. In the figure, 1 is a metal foil such as aluminum foil, and a polyolefin resin layer 2 is formed on one surface of the metal foil directly or through an adhesive. is formed, and a film 3 made of a mixture of polyester and polyamide is laminated on this polyolefin resin layer 2 directly or via an adhesive. Note that 4 is a surface layer laminated on the other surface of the metal foil 1. Moreover, FIG. 2 shows an example of a composite packaging material that does not use metal foil. When manufacturing containers such as packaging bags using these composite packaging materials, the film 3 made of the mixture of polyester and polyamide is folded back or overlaid to form the innermost layer, and the films 3 facing each other are heat-sealed. The packaging material may be formed into an appropriate shape such as a bag, or the edges of the packaging material may be overlapped and thermally bonded or high-frequency sealed. Here, the polyesters used for the film made of a mixture of polyester and polyamide that forms the innermost layer of the packaging material include polyethylene terephthalate, copolyester of terephthalic acid, isophthalic acid, and ethylene glycol, and terephthalic acid and isophthalic acid. A copolyester obtained by copolymerizing an acid and 1,4-dicyclohexanedimethanol, a copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, and propylene glycol,
A copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, ethylene glycol, and propylene glycol is used, and a nylon 6-66 copolymer is used as the polyamide to be mixed with the copolyester. In the present invention, it is necessary to use a mixture of these polyesters and polyamides,
Even if the above-mentioned polyester or polyamide is used alone, it is impossible to form an innermost layer that protects the flavoring component and has high heat seal strength and impact resistance. In addition, as mentioned above, nylon 6-66 copolymer is used as the polyamide, and in this case, even if nylon 6 or nylon 66 is mixed with the above polyester instead of nylon 6-66 copolymer, the heat seal strength will increase. , the impact resistance is poor and the object of the present invention cannot be achieved. Note that known polyesters and nylon 6-66 copolymers can be used. In this case, the mixing ratio of the polyester and polyamide is required to be 10 to 20 parts by weight of polyamide to 100 parts by weight of polyester. If the amount of polyamide is less than 10 parts by weight based on 100 parts by weight of polyester, adsorption and permeation of flavoring ingredients may be prevented, but the heat seal strength and impact strength will be low; Absorption/transmission increases, the protection of the contents becomes poor, and the heat sealing strength also decreases. The film 3 made of the mixture of polyester and polyamide is preferably unstretched, and its thickness is appropriately selected depending on the dimensions of the container, the type of contents, the filling capacity, etc.
It is preferably 100 μm, particularly 20 to 50 μm. The surface layer 4 laminated on the mixed film 3 is not particularly limited, but may be one or two of biaxially oriented polyethylene terephthalate films, nylon films, polypropylene films, paper, aluminum foils, and aluminum vapor-deposited films. It is possible to have a structure in which the above components are laminated. In addition, as a method for manufacturing a composite packaging material using the above-mentioned materials, known extrusion methods, dry lamination methods, etc. can be used alone or in combination. Effects of the Invention In other words, the composite packaging material of the present invention is a film in which the material forming the innermost layer in contact with the contents is a mixture of the above-mentioned specific polyester and nylon 6-66 copolymer in a specific ratio. By being made of this material, packaging containers manufactured using this material can prevent the adsorption and penetration of flavoring ingredients as much as possible even when containing various contents containing flavoring ingredients, and the contents will remain intact. In addition to being able to protect fragrances and contain them without compromising quality, the material of the present invention not only has good heat-sealing adhesion, but also has high heat-sealing strength and impact resistance, and is difficult to break even if dropped. Packaging containers with relatively large capacity can be manufactured. EXAMPLES Hereinafter, the effects of the present invention will be specifically explained with reference to Examples and Comparative Examples. Examples and Comparative Examples The innermost layer is a film (30μ) made by mixing the materials A to H below in the proportions shown in Tables 1 and 2, and on top of this, a polyethylene layer (50μ), an aluminum foil (9μ) and a film are sequentially coated. Composite materials of the present invention laminated with axially stretched polyester films (12μ) (Examples 1-
6) was manufactured. Polyester A: Polyethylene terephthalate B: Copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, and ethylene glycol at a weight ratio of 10:1:11 C: Copolyester C: Terephthalic acid, isophthalic acid, and 1,4-dicyclohexanedimethanol Weight ratio 10:1:
Copolyester D copolymerized with terephthalic acid, isophthalic acid, and propylene glycol in a weight ratio of 11: Copolyester E: Terephthalic acid, isophthalic acid, ethylene glycol, and propylene Weight ratio of glycol to 10:
Copolyester polyamide F: nylon 6-66 copolymer G: nylon 6 H: nylon 66 copolymerized in a ratio of 1:8:3 Next, a packaging bag was manufactured using these materials,
Adsorption of flavoring ingredients, heat seal strength, and impact resistance were investigated. In this case, the dimensions of the bag are 170mm long and 30mm wide.
mm, and the innermost layer was heat-sealed on all sides. Also, inside the bag is water in which D-limonene is dispersed.
Filled with 200c.c. Here, the flavor component adsorption test was carried out by leaving a bag containing an aqueous limonene solution at 40° C. for one week, and then examining the amount of limonene in the aqueous limonene solution. ○: There was almost no decrease in the amount of limonene, and limonene was not adsorbed. △: The amount of limonene is slightly decreased. ×: A decrease in the amount of limonene was observed, and limonene was adsorbed. Furthermore, the heat sealing strength was measured according to the heat sealing strength test of JIS-Z-1526. Furthermore, the impact resistance can be increased by heat sealing the edges on both sides and the bottom edge of the two materials.
A bag with a width of 10 cm and a width of 10 cm was manufactured, and 200 c.c. of water was poured into the bag and dropped from a height of 1.2 m. Evaluation was made by determining whether or not the heat-sealed portion was damaged. ○: No damage at all △: Some damage ×: Damage The above results are shown in Tables 1 and 2.

【table】

[Table] From the results in Tables 1 and 2, it was confirmed that the composite packaging material of the present invention does not adsorb limonene and has excellent heat seal strength and impact resistance.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are sectional views each showing an embodiment of the present invention. 3...Polyester polyamide mixed film.

Claims (1)

[Claims] 1 A composite packaging material suitable for manufacturing a packaging container capable of filling a content containing a flavoring ingredient and protecting the aroma of the content, which composite packaging material is compatible with the content. The material forming the contacting innermost layer is polyethylene terephthalate, a copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, and ethylene glycol, or a copolymerization material obtained by copolymerizing terephthalic acid, isophthalic acid, and 1,4-dicyclohexanedimethanol. Nylon 6 per 100 parts by weight of polyester selected from polyester, copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, and propylene glycol, and copolyester obtained by copolymerizing terephthalic acid, isophthalic acid, ethylene glycol, and propylene glycol.
- A composite packaging material characterized in that it is a film of a mixture obtained by mixing 10 to 20 parts by weight of a 66 copolymer.