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Method of heat-treating packaged product and heat-treated packaged product

Inactive Publication Date: 2005-05-19
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003] An object of the present invention is to provide a method of heat-treating a packaged product with a plastic material with hot water while suppressing the opalescence of the packaging material causing a poor appearance and a limited clarity and further leading to a lowering in gas-barrier property.

Problems solved by technology

The opalescence of the packaging material causes problems, such as limited observation of the content material state, and poor appearance, and is sometimes accompanied with a lowering in gas-barrier property.
The lowering in gas-barrier property of the packaging material results in problems, such as shortage of shelf-life of the packaged product.
There has not yet been developed an effective method for alleviating the above-mentioned problems accompanying the heat-treatment of packaged products in hot water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0050] Hereinbelow, the present invention will be described more specifically based on Examples, Comparative examples and Reference examples.

[0051] Component resins used in the following Examples are represented by abbreviations or symbols in Tables appearing hereinafter, and the meanings thereof are described as follows: [0052] EVOH: ethylene-vinyl alcohol copolymer (“SOANOL E3803B”, made by Nippon Gosei Kagaku K. K.) [0053] Ny6-66: nylon 6-66 copolymer (“AMILAN CM6001XF”, made by Toray K.K.) [0054] Ad. 1: Adhesive 1=acid-modified LLDPE (linear low-density polyethylene)(“ADMER NF528”, made by Mitsui Kagaku K.K.) [0055] LLDPE: linear low-density polyethylene (“MOATEC VO0398CN”, made by Idemitsu Siekiyu Kagaku K.K.) [0056] Ny6: nylon 6 (“AMILAN CM1021FS4”, made by Toray K. K.) [0057] VLDPE: very low-density polyethylene (“MOATEC V0398CN”, made by Idemitsu Sekiyu Kagaku K.K.) [0058] CPP: direct inflation film of propylene-ethylene random copolymer (made by Kureha Kagaku Kogyo K.K.) [...

examples 1-7

, Comparative Examples 1-7

[0068] As genuine working examples, a packaging product formed by enclosing a content material within a packaging material should by heat-treated. However, as the effect of boil or retort sterilization itself on the content material is well known to a skilled artisan, the opalescence characteristics of packaging film materials under boil or retort heat-treatment conditions were tested in the following manner.

[0069] Two film samples each measuring 5 cm×5 cm was cut out from each of film-form plastic packaging materials having laminate structures shown in Table 1. (Note: In the following description including Tables, films having a laminate structure using “ / ” between layers are laminate films formed by co-extrusion, and films having a laminate structure using “|” between layers (of Example 4 and Comparative Example 4) are laminate films formed by dry lamination.). Each film sample of 5 cm×5 cm was enclosed within a pouch of polyethylene-laminated aluminum s...

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Abstract

A packaged product formed by enclosing a content material, such as food or beverage, sanitary products or medical products, within a packaging material including at least a layer of hydrophilic resin, is heat-treated with hot water for, e.g., boil sterilization or retort sterilization. The hot water is caused to contain a water-soluble compound in an amount substantially exceeding a level contained in tap water, whereby it becomes possible to suppress the opalescence of the packaging material causing inferior appearance or transparency and leading to a lowering in gas-barrier property, which has been problematic in the conventional boil or retort hot water treatment.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of heat-treating a packaged product (formed by packaging a content material, such as food, beverages, sanitary products or medical materials, with a plastic packaging material or container for packaging or containing the content material) with hot water for sterilization, cooking, etc. More particularly, the present invention relates to a method of heat-treating a packaged product with a plastic material or container (hereinafter inclusively referred to as a “packaging material”) in hot water while suppressing opalescence (or whitening) or lowering in gas-barrier property of the plastic packaging material, and also a packaged product thus heat-treated. BACKGROUND ART [0002] Hitherto, plastic packaging materials have been widely used for packaging or as containers for food or beverage, sanitary products and medical materials. Among such plastic packaging materials, some materials have been known as causing opalescence o...

Claims

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Application Information

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IPC IPC(8): B65B55/06A23L3/00A23L3/02A23L3/10A61L2/04A61L2/26B65B53/04B65B55/02B65B55/04B65D65/40B65D81/24
CPCA23L3/02A23L3/10A61L2/04Y10T428/1352A61L2202/24B65B55/02A61L2/26
Inventor YAMANE, KAZUYUKIKAWAKAMI, YUKICHIKAWAKAMATSU, AKIKOYASUDA, MATSUOTANAKA, MIKIO
Owner KUREHA KAGAKU KOGYO KK
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