JPH0466049A - Packaged raw pineapple - Google Patents

Abstract

PURPOSE:To preserve raw pineapple keeping the freshness over a long period without generating disagreeable smell by removing the skin and core from a pineapple and sealing the pineapple together with a deoxidizer and an ethylene gas absorbent in a vessel made of a specific high-nitrile resin. CONSTITUTION:The sin and core are removed from a raw pineapple. The pineapple is sealed together with a deoxidizer and an ethylene gas absorbent in a vesel made of a high-nitrile resin which is a copolymer containing >=50wt.% of an unsaturated nitrile. The high-nitrile resin is preferably produced by polymerizing a mexture of acrylonitrile monomer and a monomer copolymerizable with the acrylonitile monomer in the presence of a conjugated diene rubber.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a package for fresh pie apples made of a high nitrile resin, and more specifically, it relates to a package for fresh pie apples that has excellent preservability. It is something to do.

[Conventional technology]

Fresh pie apples are widely eaten as an after-meal dessert or snack, and are sold in various forms, such as with the skin on or sliced. recently,
At supermarkets, etc., the skin and core are removed, slices are placed in foamed polystyrene trays, and the meat is covered with plastic wrap so that consumers can easily eat it. However, these packaging methods tend to result in overripeness and short shelf life.

For this reason, methods such as vacuum packaging using polyethylene bags have been tried, but these only slightly extend the time it takes to reach overripe, and because they are packaged in bags, it is difficult to display them at retail stores. , there were problems such as pie apples sometimes becoming deformed.

The applicant disclosed this solution in Japanese Patent Application Laid-Open No. 1999-240468, but it was found that this package did not cause any discoloration or deterioration of the pulp when stored for a long period of time, but it did have some odor problems. did.

Therefore, there is a need for a packaging method or package that can preserve the freshness of the apple from which the skin and core have been removed.

[Problem to be solved by the invention]

It is an object of the present invention to provide a package of raw pie apples from which the skin and core have been removed, which are free from discoloration, damage to the pulp, and odor, and are excellent in maintaining freshness.

[Means to solve the problem]

The inventors of the present invention have made extensive studies to solve this problem, and by storing and sealing fresh pie apples together with an oxygen absorber and an ethylene gas absorbent in a container made of a specific resin, the inventors have found that no odor will be generated for a long period of time. They discovered that it is possible to preserve the product in good freshness, and finally completed the present invention.

That is, in the present invention, raw pie apples from which the skin and core have been removed, an oxygen scavenger, and an ethylene gas absorbent are placed in a container made of a high nitrile resin, which is a copolymer containing 50% by weight or more of unsaturated nitrile. This is a package of fresh pie apples, characterized by being stored and sealed.

The high nitrile resin used in the present invention is a copolymer mainly composed of unsaturated nitrile monomers such as acrylonitrile and methacrylonitrile, and preferably has an unsaturated nitrile monomer content of 50% by weight or more. It contains 55% by weight or more.

Monomers that can be copolymerized with unsaturated nitrile monomers include:
Examples include styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate, and one or more of these are copolymerized with an unsaturated nitrile monomer.

In addition, high nitrile resins include mixtures of rubber-like polymers such as butadiene-acrylonitrile copolymer, isoprene-acrylonitrile copolymer, butadiene-styrene copolymer, polybutadiene, polyisoprene, and the above copolymers; In the presence of these rubbery polymers,
It is also possible to use a product obtained by graft polymerizing an unsaturated nitrile monomer and the above-mentioned copolymerizable monomer. In particular, the acrylonitrile monomer content is 50% by weight or more, and a mixture of a large amount of acrylonitrile monomer and a monomer copolymerizable with the acrylonitrile monomer is used in the presence of conjugated diene synthetic rubber. The polymer produced by the above polymerization is preferred because it has a good balance of processability, impact resistance, etc., and also has good storage suitability.

It should be noted that if the unsaturated nitrile monomer content is less than 50% by weight, gas-tightness tends to be insufficient and the storage period will be shortened, which is not preferable.

The container used in the present invention is manufactured by vacuum forming, pressure forming, or the like a sheet obtained from the resin by a conventional T-die extrusion method, calendar molding method, inflation silane molding method, or the like. When using a high nitrile resin, deep drawing is easily possible, and containers of various shapes, such as circular, triangular, square, etc., can be easily obtained.

The thickness of the wall of the container used in the present invention varies depending on the internal capacity, required strength, etc., but is usually 100 to 1000 uVI; if it is less than 100p, the container tends to lack rigidity; Although it is possible to exceed the above, it is not preferable because it may result in poor workability or increase in cost.

As the top film (II) of the container used in the present invention, a single-layer film of the above-mentioned high nitrile resin or a multilayer film obtained by laminating the above-mentioned single-layer film on a film of polypropylene, polyethylene, polyester, nylon, etc. is used as the top film. A multilayer film having a gas barrier layer of polyamide or ethylene-vinyl alcohol copolymer can also be used. 3g
The top film is sealed to the container body using a conventional heat sealing method, impulse sealing method, or the like. Furthermore, the top film can be printed if necessary to increase the commercial value of the package.

In the present invention, raw pie apples from which the skin and core have been removed are packed into a container made of high nitrile resin, and an oxygen scavenger and an ethylene gas absorbent are contained in the container, which is then sealed to preserve the fresh pie apples for a long time. is possible.

Note that the fresh pie apple package of the present invention is preferably stored and transported at a low temperature, and a temperature of 0°C to 10°C is suitable.

[Effect]

An example of implementation of the present invention will be described based on the drawings.

FIG. 1 is a sectional view of the fresh pie apple package of the present invention.

Fresh pie apple with the skin and core removed is used as a gas barrier.
A top film 3 is placed on a container 2 made of synthetic resin with excellent properties.
By storing and sealing the pie apple together with the oxygen absorber 4 and the ethylene gas absorber 5, the fresh pie apple can be kept fresh for a long period of time.

〔Example〕

The present invention will be explained below with reference to Examples.

Production Example 1 A high nitrile resin obtained by emulsion polymerization of a mixture of 75 parts by weight of acrylonitrile and 25 parts by weight of methyl methacrylate in the presence of 10 parts by weight of a butadiene-acrylonitrile rubbery copolymer (butadiene content 70% by weight). Acrylonitrile content, approximately 70% by weight, based on nitrogen analysis value.)
A sheet with a thickness of 700 μm was obtained by extrusion molding. This sheet is vacuum formed and has an inner diameter of 10C and a depth of 15.
A cylindrical container of cm was obtained.

Production Example 2 A mixture consisting of 70 parts by weight of acrylonitrile, 15 parts by weight of methyl methacrylate, and 51 parts by weight of styrene was polymerized in the presence of 10 parts by weight of a butadiene-acrylonitrile rubbery polymer (containing 80% by weight of butadiene) as a resin. High nitrile resin (acrylonitrile content,
Approximately 65% by weight, based on nitrogen analysis. ) A cylindrical container was obtained in the same manner as in Production Example 1, except that the following was used.

Production Example 3 Using the same high nitrile resin as in Production Example 1, a film with a thickness of 40 μm was obtained by inflation molding.

Example 1 The container obtained in Production Example 1 was filled with fresh pie apples from which the skin and core had been removed, an oxygen scavenger and an ethylene gas absorbent were placed therein, and the container obtained in Production Example 3 was sealed with a top film. The fruit was heat-sealed and stored at 10°C, and the package was opened every predetermined number of days to check for discoloration, odor, and damage to the pulp. The results are shown in Table 1.

Example 2 Example 1 was repeated except that the container obtained in Preparation Example 2 was used. The results are shown in Table 1.

Comparative Example 1 Example 1 was repeated except that a polystyrene container was used instead of the high nitrile resin container and the container was covered with a cling film. The results are shown in Table 1.

Comparative Example 2 Example 1 was repeated except that the oxygen scavenger and ethylene gas absorbent were not used. The results are shown in Table 1.

Comparative Example 3 Example 1 was repeated except that a carbon dioxide absorbent was used instead of the ethylene gas absorbent. The results are shown in Table 1.

Table 1 [Effects of the Invention] The package for fresh pie apples of the present invention suppresses the discoloration of fresh pie apples, the generation of off-flavors, and damage to the pulp, and has extremely good storage stability. This will greatly contribute to the distribution and sales of products.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the fresh pie apple package of the present invention. 1 in the figure: Fresh pineapple: Container 3 Nidotsubu film: Oxygen scavenger: Ethylene gas absorbent.

Claims (1)

[Claims] 1. In a container made of high nitrile resin, which is a copolymer containing 50% by weight or more of unsaturated nitrile, fresh pie apple with the skin and core removed, an oxygen scavenger, and an ethylene gas absorbent. A package of fresh pie apples, characterized by being stored and sealed. 2. Claim 1, wherein the high nitrile resin is produced by polymerizing a mixture of an acrylonitrile monomer and a monomer copolymerizable with the acrylonitrile monomer in the presence of a conjugated diene synthetic rubber. A package of fresh pie apples as described.