JPH01240468A - Packaging body of raw pineapple - Google Patents

Abstract

PURPOSE:To keep raw pineapples fresh by a method wherein raw pineapples with their peels and cores removed are put in a container made of high nitrile resin whose content of unsaturated nitrile monomer is higher than a specific rate together with absorber for oxygen and carbonic acid gas, and the container is sealed. CONSTITUTION:In a package for a raw pineapple, a raw pineapple with its peel and core removed is put in a container made of high nitrile resin whose content of unsaturated nitrile monomer is 50weight% or more and in which absorber for oxygen and carbonic acid gas is absorbed, and the container is sealed. High nitrile resin to be used is copolymerizate whose main ingredient is unsaturated nitrile monomer such as acrylonitrile and methacrylonitrile. If the content of unsaturated nitrile monomer is less than 50weight%, sealing property of gas tends to be poor, resulting in reduction of the preservation term. This package prevents the pineapple from discoloring and its sacrocarp from being damaged, permitting good preservation capability to be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a fresh pineapple package made of a high nitrile resin, and more particularly to a fresh pineapple package with excellent preservability.

C. Prior Art Fresh pineapple is widely eaten as an after-meal dessert or snack, and is sold in various forms, such as with the skin on or sliced. Recently, supermarkets have made it easier for consumers to eat.
It is packaged by removing the skin and core, slicing it, placing it in a foamed polystyrene tray, and cleaning it with plastic wrap. 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 overripeness, and because they are packaged in bags, they are difficult to display at retail stores. There were problems such as it was difficult and the pineapple pull could become deformed.

Therefore, raw pineapple with the skin and core removed,
A packaging method or package that can preserve freshness is desired.

[Problem to be solved by the invention]

An object of the present invention is to provide a package for fresh pineapple from which the skin and core have been removed, which is excellent in preserving freshness.

(Means for solving the problem) In order to solve the problem, the present inventors have made extensive studies,
We discovered that raw pineapple can be kept fresh for a long period of time if the container is made of a specific resin and stored together with an oxygen scavenger and carbon dioxide absorbent. The invention has been completed.

That is, the present invention provides a container made of a high nitrile resin with an unsaturated di-I-lyl monomer content of 50% by weight or more, and 4L binample from which the skin and core have been removed, and an oxygen and carbon dioxide absorbent. This is a package of fresh pineapple that is 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 has an unsaturated nitrile monomer content of 50% by weight or more. , preferably 55% by weight or more.

Monomers that can be copolymerized with unsaturated nitrile monomers include:
Examples include styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, 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 copolymerizable monomer. In particular, a mixture of acrylonitrile monomer containing 50% by weight or more and a large amount of acrylonitrile monomer and a monomer copolymerizable with the acrylonitrile monomer is used as a conjugated diene synthetic rubber. Polymers produced by polymerization in the presence of are preferred because they have a good balance of processability, fii ftl resistance, etc., and have good storage suitability.

In addition, if the unsaturated nitrile monomer content is less than 50% by weight, gas-tightness tends to be insufficient and the storage period becomes short, which is not preferable.

The container used in the present invention is manufactured by vacuum forming, pressure forming, etc. a sheet obtained from the resin by a conventional T-die extrusion method, calendar method, inflation method, etc. 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 content, required strength, etc., but is usually 100 to 1000 μm. If it is less than 100 μm, the rigidity of the container tends to be insufficient, and if it is more than 1000 μm, it may be possible, but it is not preferable because it may result in poor workability or increase in cost.

For the lid of the container used in the present invention, a single-layer film made 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 may also be used. The top film is sealed to the container body by 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 pineapple pulp from which the skin and core have been removed,
Fresh pineapple can be stored for a long time by filling it in a container made of high nitrile resin and containing an oxygen scavenger and a carbon dioxide absorbent.

In addition, the fresh pineapple package of the present invention is preferably stored and transported at a low temperature, and O'C-10'C is passed through.

〔Example〕

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

Example 1 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). (Total acrylonitrile, approximately 70% by weight, based on nitrogen analysis.

), a sheet with a thickness of 700 μl was obtained by extrusion method. This sheet was vacuum formed and had an inner diameter of 10 cm and a depth of 1.
A 5 cm cylindrical container was manufactured. This container is filled with raw pinenut pulls with the skin and core removed, and "Ageless" (trademark) is stored as an oxygen scavenger and carbon dioxide absorbent.
The fruit was heat-sealed in a separately produced high nitrile resin film with a thickness of 40 μm, and stored at 7'C. The package was opened every predetermined number of days to examine discoloration and pulp damage.

The results are shown in Table-1.

Example 2 A mixture consisting of 70 parts by weight of acrylonitrile, 15 parts by weight of methyl methacrylate, and 5 parts by weight of styrene was polymerized in the presence of 1 part by weight of a butadiene-acrylonitrile rubbery polymer (butadiene content 80% by weight) as a resin. Example 1 was repeated, except that a resin (acrylonitrile content, about 65% by weight, by nitrogen analysis) was used.

The results are shown in Table-1.

Comparative Example 1 Example 1 was repeated except that ordinary polystyrene was used as the resin and the lid was covered with a cling film.

The results are shown in Table-1.

Comparative Example 2 Example 1 except that no oxygen scavenger and carbon dioxide absorbent were used
repeated. The results are shown in Table-I.

Table 1 ×: Severe discoloration, severe pulp damage (Effects of the invention) Unsaturated 2) An oxygen and carbon dioxide absorbent was placed in a container made of high nitrile resin with an IJ monomer content of 50!11% or more. In Examples 1 and 2, the container was made of IJ resin, but without the oxygen and carbon dioxide absorbent. Compared to Comparative Example 2, there was no discoloration of the fresh pineapple or damage to the pulp at all, and it is clear that the fresh pineapple had extremely good storage stability.

The fresh pineapple package of the present invention suppresses discoloration of fresh pineapple or damage to the pulp, has extremely good storage stability, and greatly contributes to the distribution and sale of fresh pineapple.

Claims (1)

[Claims] 1. Fresh pineapple from which the skin and core have been removed and an oxygen and carbon dioxide absorbent are stored in a container made of a high nitrile resin with an unsaturated nitrile monolayer content of 50% by weight or more. A package of fresh pineapple, characterized in that it is packed and sealed. 2. A claim in which 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. The fresh pineapple package according to item 1.