JP2004161382A - Package of retort food - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a package of a retort food which shows a small deterioration in quality of the food even if it is stored at an ambient temperature for a long term. <P>SOLUTION: The package is obtained by housing the food in a tray made of a resin sheet composed of PP(polypropylene)/EvOH(ethylene-vinylalcohol copolymer)/ PP(polypropylene), sealing it with a retort resistant film and tightly sealing it with a material having a high gas barrier property after a retort treatment. When it is tightly sealed with the material having a high gas barrier property, an oxygen scavenger is put in at the same time or the food is degassed. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a retort food package that can be stored at room temperature for a long time. More specifically, the present invention relates to a package of a room-temperature-preserved food product, which has the convenience of being taken out only in a required amount and heated in a microwave oven or used as it is.

  In the field of frozen foods, various ideas have been devised, such as products that can be heated in a microwave oven for each container and products that use trays that have been subdivided so that only the required amount can be used (Patent Documents 1 and 2). Rather, a wide variety of products are sold in cooking methods and product forms. On the other hand, retort foods have the merit of being able to be stored at room temperature, but they have many limiting factors and their diversification is delayed compared to frozen foods.

JP-A-10-276903 Japanese Utility Model Application Laid-Open No. 62-134872

  The present invention is similar to a type of product that is popular for lunches in the field of frozen foods, which is stored in trays little by little, and which can be used for microwave heating, which can be separated from the tray, or which can be used for natural thawing. An object of the present invention is to provide a product which can be stored at room temperature.

According to the present invention, food is stored in a tray made of a resin sheet of PP / EvOH / PP, sealed with a retort-resistant film, and after retort treatment, sealed and packaged with a material having a high gas barrier property, so that it can be stored at room temperature. It is a package of retort foods characterized by suppressing quality deterioration of foods. Preferably, an oxygen absorber is enclosed or degassed at the same time when the container is sealed and packaged with a material having high gas barrier properties.
According to the present invention, a food is placed in a tray made of a resin sheet having a configuration of PP / EvOH / PP molded so that a small amount of food can be stored in small portions, sealed with a retort-resistant film, and retorted. A retort food package characterized by suppressing the quality deterioration of food during storage at room temperature by hermetically packaging with a material having high gas barrier properties. It is preferable that the portion of the tray molded so that small portions of the food can be stored in small portions is cut so as to be cut off.
According to the present invention, foods that are susceptible to oxidation are placed in a tray made of a resin sheet composed of PP / EvOH / PP, sealed with a retort-resistant film, and sealed with a material having high gas barrier properties after retort treatment. A retort food package characterized by suppressing deterioration of food quality during storage at room temperature by packaging.

  Advantageous Effects of Invention According to the present invention, it is possible to suppress deterioration of the quality of a food that is stored in a tray little by little and can be used for heating in a microwave oven or that can be used by natural thawing during storage at room temperature. In particular, the effect is large in products that are easily deteriorated by oxygen and products that are easily affected by light, such as foods having a high lipid or protein content. The retort food of the present invention can be stored at room temperature for at least 3 months or more, usually for 6 months or more.

The resin sheet having the structure of PP / EvOH / PP used in the present invention is a resin sheet having retort resistance and having a property of being molded into a tray or the like. EvOH is sold under the trademark EVAL by Kuraray Co., Ltd. and is widely used in the field of food packaging. As a resin sheet having a PP / EvOH / PP configuration, a Lamicon cup manufactured by Toyo Seikan Co., Ltd., a multi-ray sheet manufactured by Idemitsu Unitech Co., Ltd., or the like can be used. A transparent type or an opaque type may be used.
As the retort-resistant film for sealing the tray, a film having gas barrier properties and retort resistance obtained by depositing silica, aluminum, alumina or the like can be used. These are obtained by depositing silicon oxide (SiOx), aluminum, aluminum oxide, etc. on a base film such as PET (polyethylene terephthalate), PP, etc., and suppress transmission of oxygen and water vapor by a transparent deposited layer, and have high barrier properties. It has a good boil and retort suitability. The film may be a transparent type or an opaque type.

In the retort treatment in the present invention, an appropriate temperature and time are adopted according to the food to be packaged, but usually, the temperature is 110 to 125 ° C. and the time is about 15 to 60 minutes.
In the present invention, as the material having high gas barrier properties used for the exterior, a film on which silica, aluminum, alumina, or the like is vapor-deposited can be used as in the above-described film. Since the exterior is not retorted, it is possible to use a material having no retort suitability as compared with the above-mentioned film material. A transparent type or an opaque type may be used.
After the retort treatment, it is preferable to seal and package with a material having high gas barrier properties as soon as possible.
The suppression of deterioration of the quality of food during storage at normal temperature according to the present invention can be measured by sensory tests or by measuring a value indicating the degree of oxidation of the food, such as a peroxide value (PV) and an acid value (AV). .

In the present invention, the resin sheet having the constitution of PP / EvOH / PP has a gas barrier property, but the gas barrier property decreases when the humidity is high, so that the oxygen permeation until the humidity of the sheet after the retort treatment decreases is reduced. The point is to control. Therefore, it is preferable to reduce the amount of oxygen as much as possible when the package is hermetically sealed. For this reason, the effect is further enhanced by enclosing a deoxidizer at the same time as sealing and packaging with a material having a high gas barrier property, or by performing degassing.
The PP / EvOH / PP resin sheet tray used in the present invention is preferably molded so that small quantities of food can be stored in small portions. Normally, one divided into about 2, 4, 6, 8 sections is used. It is convenient if the sections are cut so that they can be cut off for each section.

As the food used in the present invention, any food such as fish meat, animal meat, vegetables and the like can be used as long as it is a food having retort resistance. Since a tray is used, there is no problem with food that tends to fall apart, such as stewed hijiki. Since the tray has microwave resistance, in the case of foods requiring heating, the whole tray can be directly heated in a microwave oven.
Foods containing a large amount of fats and oils and proteins are liable to deteriorate in quality due to oxidation, but the present invention enables long-term storage at room temperature. Foods containing a large amount of fats and oils and proteins are made from fish meat, animal meat, eggs, seeds, and milk, and cooked products include karaage, meatballs, boiled eggs, cashew nuts, and cheese. Other foods made from vegetables and the like also use seasonings containing fats and oils and proteins in cooking, so that the packaging of the present invention is useful for such foods.

  Hereinafter, examples of the present invention will be described, but the present invention is not limited thereto.

  The salmon loosened from the salmon meat that has been boiled with the seasoning liquid is placed on a multi-lay sheet (made by Idemitsu Unitech Co., Ltd.) tray (tray size: 108 mm x 139 mm x 23 mm. Divided into 4 sections, 1 section size ... 36 mm x 62 mm x 22 mm) were filled with 15 g per section (60 g in the entire tray), and sealed with a vapor-deposited PET / NY (nylon) / PE (polyethylene) multilayer film (manufactured by Toppan Printing Co., Ltd.) A retort sterilization treatment was performed at 116 ° C. for 50 minutes. Twenty-four hours later, this was hermetically packaged with a vapor-deposited PET / CPP film (manufactured by Kyodo Printing Co., Ltd.) together with a deoxidizer (Ageless manufactured by Mitsubishi Gas Chemical Co., Ltd.).

  The product of the package of Example 1 and the product without exterior were stored at room temperature of 5 to 25 ° C. for 6 months from July to January, and evaluated by a panel of sensory test. 80% of the panelists felt a difference between the two, and evaluated that the flavor and texture of Example 1 were preferable.

  Salmon meat cut into moderate size is immersed in a seasoning liquid, and grilled salmon salt baked to a weight of 80% is divided into 4 trays (tray size: 108 mm x 139 mm x 23 mm, manufactured by Idemitsu Unitech Co., Ltd.). The size of one section: 36 mm x 62 mm x 22 mm), one piece per section (20 g per piece) (80 g in the entire tray), and evaporated PET / NY (nylon) / PE (polyethylene) It was sealed with a multilayer film (manufactured by Toppan Printing Co., Ltd.) and subjected to a retort sterilization treatment at 116 ° C. for 50 minutes. Twenty-four hours later, this was hermetically packaged with a vapor-deposited PET / CPP film (manufactured by Kyodo Printing Co., Ltd.) together with a deoxidizer (Ageless manufactured by Mitsubishi Gas Chemical Co., Ltd.).

  The product of the package of Example 2 and the product without the exterior were stored at 35 ° C. for 2 months. The POV value of the grilled salmon salt was 6.2 meq / kg immediately after sterilization, whereas the product without the exterior was 9.2 meq / kg, and the product of Example 2 was 5.8 meq / kg. It was shown that the packaging of the product suppressed quality deterioration.

  Similarly to Example 1, the effect of the package of the present invention was confirmed for other foods. Table 1 shows the results of sensory tests before storage, after storage for 3 months, and after storage for 6 months. Degradation of flavor and the like was observed after 3 months without the exterior, but it was shown that storage for 6 months was possible by using this package.

According to the present invention, a form similar to a product of a type that is popular for lunches in the field of frozen foods and is used for heating a microwave oven that can be separated from the tray by a small amount and that can be used for natural thawing. And a product that can be stored at room temperature.

Claims (6)

  Food is placed in a tray made of PP (polypropylene) / EvOH (ethylene-vinyl alcohol copolymer) / PP (polypropylene) resin sheet, sealed with a retort-resistant film, retorted, and then a material with high gas barrier properties A package of retort food, in which the quality deterioration of the food during storage at room temperature is suppressed.   The retort food package according to claim 1, wherein an oxygen scavenger is enclosed at the same time when the package is sealed with a material having high gas barrier properties.   The retort food package according to claim 1, wherein the package is degassed at the same time as being sealed and packaged with a material having high gas barrier properties.   The retort food package according to claim 1, 2 or 3, wherein the tray made of a resin sheet having the constitution of PP / EvOH / PP is molded so as to be able to store food in small portions.   5. A packaging for retort food according to claim 4, wherein a portion formed in a tray made of a resin sheet having a constitution of PP / EvOH / PP so as to be able to store small portions of food in small portions is cut so as to be cut off. body. The retort food package according to any one of claims 1 to 5, wherein the food is a food susceptible to oxidation.