JPH034775A - Cold insulation by food packaging container - Google Patents

Abstract

PURPOSE:To provide the subject cold insulation intended to prevent the rise in food temperature even under inadequate temperature control conditions and to entirely remove drips developed during fresh food distribution by using a cold insulation container combined with drip absorptivity which can be produced by a specific means. CONSTITUTION:Firstly, a water-absorptive sheet 2 is laid on the inner bottom of a food packaging container 1 and covered with a moisture-impermeable film 3 having numerous fine water-penetrable holes 30, and the edges of this film 3 are bound to the container 1. Second, the sheet 2 is made to hold water at such a volume as to be account for 20-80wt.% of its maximum water absorption. Finally, said container 1 is frozen to freeze the water held followed by putting foods into the container 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for keeping seafood, meat, vegetables, etc. cold, and a packaging container having drip water absorption for fresh foods that require drip water absorption. Regarding cold storage methods.

[Conventional technology]

Currently, fresh foods such as seafood, meat, and vegetables are stored at low temperatures in large refrigerators, and then sold to retail stores in refrigerated trucks and the like at appropriate times.

At retail stores, these products are made into sales shapes, packed in packaging containers, and displayed at low temperatures in refrigerated cases at stores. The distribution route is that consumers purchase this and take it home at room temperature. At this time, functions such as drip water absorption and cold retention are not added to the packaging container body used. Therefore, there is a problem in that it requires time and expense to separately seal the drip water absorbent sheet, cold storage/ice pack, etc. in the same container, and furthermore, a storage space for these materials is required at the retail store.

[Problem to be solved by the invention]

Decrease in the freshness of fresh foods is caused by factors such as the enzyme action of the fresh foods themselves, the proliferation of spoilage bacteria attached to the fresh foods, and the generation of drips, and the influence of these factors changes greatly depending on the temperature.

For this reason, there is relatively little loss of freshness in environments where temperature is controlled, such as in refrigerated display cases at retail stores. but,
The temperature of fresh food rises in environments where temperature control is insufficient, such as when consumers take it home from the store, and especially in private cars, buses, etc., and during high temperatures in the summer. is remarkable.

As the temperature of the food increases, enzyme action, bacterial growth, and large amounts of drips occur, significantly reducing the quality and commercial value of fresh food delivered to your home.

[Objective of the Invention] The present invention is designed to completely remove drips that occur during the distribution of fresh foods, without increasing the quality of fresh foods even when temperature control is insufficient, such as between stores and homes.
The purpose is to provide a method to preserve the quality and commercial value of fresh foods.

[Means to solve the problem]

As a result of intensive research to solve the above problems, the inventors of the present invention laid a water-absorbent sheet inside a food packaging container, let this water-absorbent sheet retain water, and frozen the retained water to improve drip absorbency. The inventors have discovered that a cold storage method using a cold storage container having the following functions is effective, and have completed the present invention.

That is, the present invention lays a water absorbent sheet on the inner bottom surface of a food packaging container body, covers it with an impermeable perforated film having a large number of minute water holes, and joins the edge of the perforated film to the container body. Using a packaging container made of
% of water is retained, the container body is frozen, the retained water is frozen, and the food is stored within the container body. It is something to do.

The cold preservation method of the present invention will be explained below based on the drawings.

FIG. 1 shows a cross-sectional view of a cold storage container used in the present invention,
FIG. 2 shows a perspective view of a cold storage container used in the present invention.

As shown in FIGS. 1 and 2, the cold storage container is made of thermoplastic resin and has a peripheral stepped portion 10 and a water-absorbent sheet storage recess 11. The water-absorbent sheet 2 is stored in the recess 11, and a perforated film 3 is placed in the recess 11.
consists of a container body 1 joined at a peripheral step 10.

Examples of the material for the water-absorbing sheet 2 include materials having water-absorbing properties, such as pulp, non-woven fabric, paper, materials in which a super-absorbent resin is sandwiched between pulp or non-woven fabrics, and a sheet-like base material with a super-absorbent resin immobilized thereon. These materials are subjected to processes such as paper making, compression, and adjustment of the amount of superabsorbent resin, and are adjusted to have the desired maximum water absorption amount before being used in the present invention.

The maximum water absorption amount of the water absorbent sheet is preferably 1,000 g/rf or more, preferably in the range of 2,000 to 60,000 g/rf.

In addition, the amount of water retained and frozen in the water-absorbent sheet is
In order to retain the water absorption ability to completely absorb and remove drips from food, the maximum water absorption capacity of the water absorbent sheet is 20 to 8.
It is preferable to set it to 0%. The maximum water absorption amount was measured by the following method. The weight (-1) of the water absorbent sheet is measured, and after immersing it in tap water for 30 minutes, it is naturally dried on a 16-mesh wire mesh for 20 minutes, and the weight (Hz) is measured.

Maximum water absorption (g) = Ka2-W1 becomes.

The water that the sheet retains here can be regular tap water, but
Depending on the usage situation and purpose, inorganic salts such as saline, disinfectants, etc.
Water to which deodorants, freshness-preserving agents, freezing point regulators, etc. have been added may also be used.

The material for the perforated film 3 may be polyester, nylon, polystyrene, polypropylene, polyvinyl chloride, etc., as long as it absorbs water into the water absorbent sheet and hides drips and the like. In addition, in order to strengthen the hiding property, the film may be subjected to a treatment such as containing or coating a hiding material such as titanium oxide or calcium carbonate.

Any material can be used for the food packaging container body used in the present invention as long as it does not impair the effects of the present invention, such as expanded polystyrene.

[Examples] The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 A cold storage container was manufactured with the following configuration, and cold water was frozen.

Container material: polystyrene foam Container body size: 24.5 x 12 x 2.
5cm perforated film...Polypropylene film with many holes Water absorbent sheet material...Pulp, 715g/c+fl
Size of water absorbent sheet...14X 5Xo, 2cm
Maximum water absorption amount of water absorbent sheet...40g (0.6g
/ c + fl) Water used: Tap water freezing temperature: -20″C Freezing time: 8 hours Place half-thawed bigeye tuna (15X4X2
CI, product temperature -2°C, the same product temperature as the product delivered to the supermarket), and after wrapping, immediately put it in a refrigerated case at +5°C.
Let stand for a while. (Same as retail store display conditions) After that, leave it at room temperature (+25°C) (set conditions from store to home) and measure changes in temperature (core temperature of tuna), presence or absence of dripping, and appearance. did.

At this time, the evaluation criteria for the presence or absence of drip and appearance are as follows.

UEVEBUKI ■Yugori 1...The drip is completely removed and cannot be seen.

2... A small amount of drip is visible around the pieces of meat.

3... Drips are visible around the large pieces of meat.

4... Drips are spreading on the tray surface.

Outer - twin 1... Bright red.

2...Red.

3...Dark red.

4...brown.

These evaluation results are shown in Table-1.

Comparative Example 1 In Example 1, the above evaluation was performed without making the water absorbent sheet retain water.

Comparative Example 2 In place of the cold storage container in Example 1, the above evaluation was performed using a conventionally used tray made of expanded polystyrene.

Comparative Example 3 The above evaluation was performed using the same amount of ice as the water retained in the sheet in Example 1 instead of the water absorbent sheet in Example 1.

Comparative Example 4 In place of the water absorbent sheet in Example 1, the above evaluation was performed using a commercially available cold storage agent in the same amount as the water retained in the sheet in Example 1.

The evaluation results of Comparative Examples 1 to 4 are also shown in Table-1.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a food packaging container used in the present invention, and FIG. 2 is a partially cutaway perspective view of the food packaging container used in the present invention. ■...Food packaging container body 2...Water absorbent sheet 3...Perforated film 10...Peripheral step 11...Water absorbent sheet storage recess 30...Water holes

Claims (1)

[Claims] 1. A water absorbent sheet is laid on the inner bottom surface of the food packaging container body, covered with an impermeable perforated film having a large number of minute water holes, and the edge of the perforated film is attached to the container body. First, using a packaging container joined to the water absorbent sheet in the container body,
Drip water absorbency characterized by storing 20 to 80% of the maximum water absorption amount of water in the water absorbent sheet, then freezing the container body to freeze the retained water and storing food inside the container body. A cold storage method using a food packaging container that combines the following. 2. The cold preservation method according to claim 1, wherein a food packaging container is used, wherein a peripheral step is provided near the bottom of the food packaging container body, and a perforated film is joined to the peripheral step. 3. The method for keeping cool using a food packaging container according to claim 1, wherein the food packaging container main body has a bottom portion recessed downward to form a recessed portion for accommodating the water absorbent sheet. 4. Claim 1, wherein the water-absorbing sheet is made of pulp or nonwoven fabric.
Cold storage method using food packaging containers as described.