JPS63307079A - Ham package - Google Patents

Abstract

PURPOSE:To store ham in a fresh state even under a refrigerating condition for a long period of time, by using a container made of a specific resin and filling the space part thereof with gas having a specific composition. CONSTITUTION:A container is composed of a high nitrile resin whose content of an unsaturated nitrile monomer is 50 wt.% or more and, especially, the high nitrile resin obtained by copolymerizing acrylonitrile and the monomer copolymerizable with said acrylonitrile in the presence of conjugated diene type synthetic rubber is pref. because processability and storage aptitude are well. Ham is packed in the container obtained by molding said high nitrile resin and the space part thereof is filled with a gaseous mixture of nitrogen and carbon dioxide to make it possible to store ham for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a ham package, and more particularly to a ham package that maintains freshness.

[Conventional technology] Ham is pork that has been soaked in salt and then smoked.In recent years, ham has been sold in supermarkets by pre-slicing it, dividing it into trays made of foamed polystyrene or polyethylene, and wrapping it in plastic wrap. The number is increasing. By the way, in the past, supermarkets and the like have packaged food in or near the store, but in cases where extremely sanitary conditions are required, such as meat processing, food is packaged at a processing factory and then delivered to the store. However, with conventional trays made of expanded polystyrene or polyethylene and wrapped in plastic wrap, a considerable amount of time has passed from the packaging process until the products are delivered to the store, causing problems such as discoloration and deterioration, reducing product value. Therefore, there is a need for a packaging method or package that can preserve freshness under refrigerated conditions.

(Problems to be Solved by the Invention) An object of the present invention is to provide a package that is excellent in preserving the freshness of ham.

[Means for solving problems]

In order to solve this problem, the present inventors have made extensive studies and found that if the container is made of a specific resin and the space is filled with a gas of a specific composition, the ham will stay fresh for a long time. They discovered that it is possible to preserve it even under refrigerated conditions, and finally completed the present invention.

That is, the present invention provides a ham characterized in that the container is made of a high nitrile resin with an unsaturated nitrile monomer content of 50% by weight or more, and the space is filled with a mixed gas of nitrogen and carbon dioxide. It is a package.

The high nitrile resin used in the present invention is a copolymer mainly composed of unsaturated nitrile monomers such as acrylonitrile and methacrylate monomer, and has an unsaturated nitrile monomer content of 50% by weight or more. . Examples of comonomers include styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate, which can be copolymerized with unsaturated nitrile monomers alone or in combination of two or more. Ru. In addition, this copolymerization
It may be carried out in the presence of rubbery polymers such as acrylonitrile copolymer, isoprene-acrylonitrile copolymer, butadiene-styrene copolymer, polybutadiene, polyisoprene, etc., and low-temperature impact properties etc. are improved. In particular, a high nitrile resin obtained by copolymerizing acrylonitrile and a monomer copolymerizable with the acrylonitrile in the presence of a conjugated diene synthetic rubber has good processability and storage suitability. It is also preferable because it is also good.

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, etc. a sheet obtained from the above-mentioned high nitrile resin by a known film forming method such as T-die extrusion, inflation, or calendaring. In addition, since high nitrile resin can be deep drawn, containers of various shapes, such as round, triangular, and square, 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 normally 100 to 800 μm is appropriate; if it is less than 100 μm, the container tends to lack rigidity; Although there is no problem, it is not preferable because it causes poor workability and increases 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, and a conventional Seal with the container body using heat sealing method, impulse sealing method, etc.

In the present invention, the ham can be stored for a long time by packing the ham into a container made of high nitrile resin and filling the space with a mixed gas of nitrogen and carbon dioxide. The appropriate amount of carbon dioxide in the mixed gas is 10 to 30% by volume; too much carbon dioxide tends to change the taste.

Note that it is desirable to pack the ham into a container, fill it with gas, and seal it at a low temperature, and it is also preferable to store and transport the package of the present invention at as low a temperature as possible, usually at -5°C.
~+5°C is suitable.

〔Example〕

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

Example 1 75 parts by weight of acrylonitrile and 25j of methyl methacrylate in the presence of 10 parts by weight of butadiene-acrylonitrile rubbery copolymer (butadiene content 70% by weight)!
Using a high nitrile resin with an acrylonitrile content of 70% by weight (according to nitrogen analysis) obtained by emulsion polymerization of a certain amount of the mixture, a sheet with a thickness of 300 μm was obtained by extrusion. This sheet was vacuum formed to produce a tray with a depth of 3 cm.

Fill this tray with 200g of sliced roast ham,
The space was replaced with a mixed gas of 80% nitrogen and 20% carbon dioxide, heat-sealed and sealed with a top film of 40μ stiffness separately manufactured from this high nitrile resin, stored at 5°C, and the packaged body was removed every predetermined number of days. The package was opened and the status of discoloration and decomposition was examined. The results are shown in Table 1.

Example 2 A mixture of 70 parts by weight of acrylonitrile, 15 parts by weight of methyl methacrylate and 5 parts by weight of styrene was emulsified in the presence of 10 parts by weight of a butadiene-acrylonitrile rubbery copolymer (butadiene content 80% by weight) as a high nitrile resin. Acrylonitrile content obtained by polymerization: approximately 65
The product was packaged in the same manner as in Example 1 except for using a high nitrile resin with a weight percent (based on nitrogen analysis), and its shelf life was examined. Table 1 shows the results.
Shown below.

Comparative Example 1 The product was packaged in the same manner as in Example 1, except that an ordinary foamed polystyrene tray and cling film were used as the container, and the storage stability was examined. The results are shown in Table 1.

Table 1 0 No discoloration or spoilage Δ Slight discoloration × Discoloration and some spoilage [Effects of the Invention] The ham packaging of the present invention has extremely good freshness preservation properties, so it is suitable for the distribution and sale of ham. It is a great contribution.

Claims (1)

[Claims] 1. The container is made of a high nitrile resin with an unsaturated nitrile monomer content of 50% by weight or more, and the space is filled with a mixed gas of nitrogen and carbon dioxide. ham packaging. 2. The ham packaged product according to claim 1, wherein the high nitrile resin is obtained by copolymerizing acrylonitrile and a monomer copolymerizable with the acrylonitrile in the presence of a conjugated diene synthetic rubber. .