JPH0430757A - Wrapping material for food containing l-menthol - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a package for enclosing a food product containing l-menthol.

[Conventional technology]

Conventionally, l-menthol has been used as a refreshing agent in foods such as drinks and sweets.

Foods containing l-menthol are thus sold on the market sealed in individual packaging made of plastic packaging materials (including containers) or plastic laminated aluminum from the viewpoint of hygiene.

[Invention or problem to be solved]

However, conventional general plastic packaging materials
There is a problem that the content of l-menthol in foods decreases over time, and there is a demand for the development of packaging materials that can minimize adsorption of l-menthol in foods.

In view of these circumstances, the present invention provides a package for l-menthol-containing foods that can minimize the decrease in l-menthol content over time in foods stored in packaging materials. Our goal is to provide the following.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a package for enclosing a food containing l-menthol, in which a polyester resin layer is provided on the inner surface of the package that can come into contact with the food.

[Effect]

Since the l-menthol-containing food package of the present invention has a polyester resin on the inner surface of the package that can come into contact with the food, the amount of l-menthol in the packaged food decreases over time very little. It also has excellent moisture-proofing effects and productivity.

〔Example〕

A package 1 for l-menthol-containing food according to the present invention will be explained based on FIGS. 1 and 2.

As shown in FIG. 2, the package 1 of the present invention has, for example, a bag structure capable of enclosing the contents, and the contents are l-menthol-containing food 7. The l-menthol-containing food 7 is a concept that includes all foods containing l-menthol as a refreshing agent, such as drinks and sweets.

For example, as shown in FIG. 2, the package 1 is formed by stacking two sheet-like packaging materials (hereinafter simply referred to as packaging materials) 10 and 10 together and heat-sealing the periphery thereof. As shown in FIG. 1, a polyester resin layer 2 is provided on the inner surface of the package that can come into contact with the food.

This polyester resin layer 2 has a glass transition temperature of 40
℃ or more, and contains an amorphous or low crystalline modified polyethylene terephthalate resin with a crystallinity of 10% or less.

Such modified polyethylene terephthalate resin has ethylene glycol and terephthalic acid as its main components, and uses a polyhydric alcohol other than ethylene glycol and/or a polyhydric carboxylic acid other than terephthalic acid as a copolymerization component for the main components. Polyester resins made of copolymers obtained by , part of the ethylene glycol component, diethylene glycol, propylene glycol, 1.
It is formed from a modified polyethylene terephthalate resin that has been replaced with 4-cyclohexane dimetatool, trimethylolpropane, etc., or a mixed resin of the modified polyethylene terephthalate resin and polyethylene terephthalate resin.

Specific examples of the modified polyethylene terephthalate resin are:
Ethylene glycol, isophthalic acid, and terephthalic acid, 1
．． Polyester resins made of co-condensation polymers of combinations of 4-cyclohexane dimetatool, nyletine glycol, terephthalic acid, propylene glycol, isophthalic acid, terephthalic acid, etc., and polyester resins using the aforementioned terephthalic acid and ethylene glycol as raw materials for hese. When polymerizing, a trivalent carboxylic acid such as trimellitic acid is used as part of the acid component, or a trivalent alcohol such as trimethylolpropane is used as part of the alcohol component, Furthermore, it is a copolymerized polystyl resin obtained by using trivalent carbonic acid and trivalent alcohol in one part of the alcohol component and one part of the acid component.

In addition, the aliphatic cyclophonic acid component in the acid component is 10% by weight.
The resin layer formed from modified polyethylene terephthalate resin as shown above is! - This is not preferred because it reduces the non-absorption of meditol. The thickness of the polyester resin layer 2 of the present invention containing such modified polyethylene terephthalate resin is preferably 20 to 40 μm, more preferably 5 to 50 μm. If this value is less than 5 μm, it will not be possible to obtain a resin layer with a uniform thickness and good precision, resulting in the inconvenience of not being able to obtain stable heat sealing, and if this value exceeds 50 μm, the cost will increase. In addition, the film becomes stiff and has an undesirable texture.

A barrier layer 4 is provided on (outside) the resin layer 2 as shown in FIG. The barrier layer 4 is mainly made of aluminum foil or the like having gas barrier properties and water vapor barrier properties. The thickness is usually about 7 to 20 μm.

A support layer 6 is provided on (outside) such a barrier layer 4. The support layer 6 is mainly used to give strength to packaging materials or to provide for stamps, etc. Specifically, the support layer 6 is made of stretched polyester (〇-PET), stretched polypropylene (
o-pp) or cellophane.

Note that it is preferable to provide an intermediate layer as shown below between the resin layer 2 and the barrier layer 4. That is, as an intermediate layer, a polybutylene terephthalate resin or a polycarbonate resin layer, or an adhesive polyolefin resin layer and a polyolefin resin layer, or
It is preferable to provide a polyolefin resin layer having carboxyl groups on the side of the contact surface with the resin layer 2 that has been previously subjected to a corona discharge treatment.

When such an intermediate layer is provided, the sealing strength and impact resistance of the heat-sealed portion where the resin layers 2 are thermally bonded to each other are significantly improved when forming the package of the present invention.

In this example, a package prepared by fusing films by heat sealing was explained as an example, but the structure of the package is not limited to this, and can be applied to blow containers and vacuum-formed containers. Needless to say, you can get it.

The present invention described above will be explained in further detail based on specific examples shown below.

Experimental Example Biaxially stretched polyester film (1
5 μm) and AI foil (9 μm) as the barrier layer 4 were dry-laminated with a urethane adhesive to prepare a laminate as a base material for a packaging agent (hereinafter referred to as base material a).

Various resin layers constituting the inner surface of the packaging body as shown below were provided on the AI foil surface of this base material a to produce various packaging material samples (hereinafter referred to as packaging material samples).

Packaging material sample 1 (present invention) After applying a urethane adhesive to the AI foil surface of the base material a, apply a modified polyethylene terephthalate resin (Mitsui DuPont Chemical Co., Ltd.) with a glass transition temperature of 71°C to the applied surface. ): Sealer PTX207) was provided as the polyester resin layer 2.

The thickness of the resin layer 2 was 40 μm.

Packaging material sample 2 (present invention) The material of the polyester resin layer 2 of the packaging sample 1 was modified polyethylene terephthalate resin (Eastman Kodak Company, PETG 67) with a glass transition temperature of 81°C.
63).

Other than that, the same procedure as Sample 1 was carried out.

Packaging material sample 3 (comparative example) The material of the polyester resin layer 2 of the packaging sample 1 was a modified polyethylene terephthalate resin (Toyobo Co., Ltd., Byron GM 900) with a glass transition temperature of -20°C.
changed to

Other than that, the same procedure as Sample 1 was carried out.

Packaging material sample 4 (comparative example) The material of the polyester resin layer 2 of the packaging sample 1 was a low density polyethylene resin (Mitsui Petrochemical Industries, Ltd.),
I changed it to Mirason 16P). Other than that, the same procedure as Sample 1 was carried out.

Packaging material sample 5 (present invention) The thickness of the polyester resin layer 2 of the packaging material sample 1 was 20 μm, and polybutylene phrephthalate resin (Polyplastic Co., Ltd.) was used as an intermediate layer between this resin layer 2 and the AJ foil. ) Shranex PP600) was provided to a thickness of 20 μm.

The resin layer 2 and the intermediate layer were formed into a co-extruded film by co-extrusion processing, and then tri-laminated and laminated with a urethane adhesive so that the intermediate layer was in contact with the AI foil surface.

Packaging Material Sample 6 (Invention) The middle layer of the packaging material sample 5 was made of polycarbonate resin (Nipilon 5200, manufactured by Mitsubishi Gas Chemical Co., Ltd.).

The rest was the same as in Sample 5.

Packaging material sample 7 (present invention) The middle layer of the packaging material sample 4 was made of a 10 μm thick polyolefin resin (Mitsui Petrochemical Industries, Ltd. Atto v-8F-
600) and a 10 μm thick polyolefin resin (Milason 16P, Mitsui Petrochemical Industries, Ltd.). The rest was the same as in Sample 5. Note that the surface to be bonded to the AI foil surface was made of Mirason 16P.

Packaging material sample 8 (present invention) The laminated film was applied to the A1 foil side of the base material a of the laminated material described above, and the laminated film was coated with an AI foil side and a polyolefin resin having a carboxyl group (Mitsui DuPont Polychemical Co., Ltd. 222). A laminate was obtained by laminating 20 μm thick layers of Ichireru AN4213C) by an extrusion coating method and then bonding them under heat and pressure.

Next, one side of the polyolefin resin film having carboxyl groups is subjected to corona discharge treatment, and the corona discharge treated side is coated with a modified polyethylene terephthalate resin (Mitsui DuPont Polychemical Co., Ltd.) having a glass transition temperature of 71°C.
Packaging material sample 8 was obtained by directly extruding and laminating a resin layer with a thickness of 20 μm using Sealer PTX207).

Using these various packaging material samples 1 to 8, three-sided sealed pouches measuring 50 m x 40 mm were formed by heat sealing.

After filling the resulting three-sided sealed pouch with 10 g of drops containing l-menthol, the opening was sealed by heat sealing to obtain a sealed package sample.

These various sealed packaged samples were left in an atmosphere at 37° C. for 60 days and then opened, and the retention rate of the initial concentration of l-menthol contained in the food was determined by gas chromatography.

The results are shown in Table 1 below.

Table 1 〔Effect of the invention〕 The effects of the present invention are clear from the results shown in Table 1 above.

In other words, since the package for l-menthol-containing food of the present invention has a polyester resin on the inner surface of the package that can come into contact with the food, there is extremely little decrease in l-menthol in the packaged food over time. .

It also has excellent moisture-proofing effects and productivity.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of the packaging material, and FIG. 2 is a longitudinal cross-section of the package. 1. -- Packaging body, 2. Polyester resin layer, 4.
...Barrier layer, 6. Support layer, 7. L-menthol-containing food, 10. Packaging material. Applicant's representative Yasushi Ishikawa

Claims (1)

[Claims] 1. A package for enclosing a food containing l-menthol, characterized in that a polyester resin layer is provided on the inner surface of the package that can come into contact with the food. Containing food packaging. 2. The polyester resin layer has a glass transition temperature of 4.
Claim 1 characterized in that it contains an amorphous or low crystalline modified polyethylene terephthalate resin having a temperature of 0°C or higher.
A package of the l-menthol-containing food described above. 3. The l-menthol-containing food package according to claim 1 or 2, wherein the polyester resin layer has a thickness of 5 to 50 μm.