JPH08210761A - Refrigerator - Google Patents

Abstract

PURPOSE: To prevent a bad external appearance from being formed owing to an anti-fungus agent by blending an anti-fungus agent having a particle diameter less than a specific value in resin made in-refrigerator parts in a refrigerator. CONSTITUTION: An anti-fungus agent 2 is blended in ABS resin 1. The anti- fungus agent 2 carries an anti-fungus component 4 using silica gel 3 as a base material. A particle diamenter of the base material of the anti-fungus agent 2 is made smaller than 20μm whereby even if the base material absorbs water, the degree of expansion of the base material is small. Further, the base material is prevented from being expanded by covering the anti-fungus agent 2 with hydrophobic resin and hence reducing water absorption in the base material.j Even if the resin is expanded owing to the water absorption of the base material of the anti-fungus agent 2, the expansion is returned to the original size if water disappears.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freshness keeping material used in a refrigerator.

[0002]

2. Description of the Related Art Generally, foods are distributed and consumed in the form of grains, fresh foods and processed foods, but agricultural, livestock and marine products other than grains generally have a high water content. If you leave this,
Is affected by physical, chemical and enzymatic causes,
Furthermore, the proliferation of a wide variety of contaminating microorganisms causes food spoilage and spoilage, resulting in loss of its commercial value and fear of food poisoning.

Also, since various kinds of microorganisms are contaminated in dry grains, they are exposed to a high humidity environment,
Alternatively, when the water content on the surface rises due to dew condensation, there is a risk of deterioration by microorganisms.

When the ambient temperature is lowered like a refrigerator, the enzymatic or chemical reaction occurring in the food is suppressed and the growth rate of food contaminating microorganisms is also lowered.

Therefore, the thermophilic and mesophilic microorganisms of food-contaminating microorganisms, including pathogenic bacteria, are almost completely suppressed at 10 ° C. or below, and even if they are hypothermic or psychrophilic bacteria,
It is clear that the growth rapidly decreases when the temperature becomes lower than ℃.

As a result, the shelf life can be extended by keeping the food product cool. As a result, when the storage temperature of the food is -10 ° C or lower, the growth of all microorganisms on the food can be completely suppressed.

However, the antibacterial and antifungal properties of foods are not sufficient even when stored at low temperature in a refrigerator. In the refrigerator environment, the growth rate of food contaminating microorganisms is reduced,
It does not stop the growth of microorganisms. During actual use, the temperature inside the refrigerator rises due to the frequency of opening and closing the door and the time required to open and close the door once to promote the growth of microorganisms. In addition, the food stored in the refrigerator may be spoiled or mold may be generated, such as the nutrients produced by the food may help the growth of microorganisms.Therefore, resin parts that have been kneaded with antibacterial agents have been used. (JP-A-63-265809).

FIG. 7 is a cross-sectional view of a conventional refrigerator internal component, and 1 is an ABS resin that constitutes the component, in which an antibacterial agent 9 is kneaded.

[0009]

However, in the actual use of the resin part in which the antibacterial agent is kneaded, when water adheres for a long period of time, the base material of the antibacterial agent absorbs water and expands, so that the resin surface also expands. However, even after the water disappeared, the swelling of the resin surface remained, and there was a problem of poor appearance due to minute swelling.

In order to solve the above-mentioned problems, the present invention prevents the appearance defect due to an antibacterial agent.

[0011]

[Means for Solving the Problem] In order to solve this problem,
The present invention is one in which an antibacterial agent having a particle size of 20 μm or less is kneaded into a resinous internal storage part of a refrigerator.

In addition, an antibacterial agent coated with a hydrophobic resin is kneaded into the resinous interior parts of the refrigerator.

Further, polypropylene is used as the resin of the resinous internal parts in which the antibacterial agent of the refrigerator is kneaded.

[0014]

With the above-mentioned structure, the particle size of the base material of the antibacterial agent is 2
Since it is smaller than 0 μm, the expansion degree is small even if the base material absorbs water.

Further, since the antibacterial agent is coated with the hydrophobic resin, the amount of water absorption of the base material is reduced and expansion is prevented.

Further, even if the resin swells due to the water absorption of the base material of the antibacterial agent, the swelling will be restored when the water disappears.

[0017]

EXAMPLES An example of the present invention will be described below.
As shown in FIG. 1, reference numeral 1 is an ABS resin having a component structure, and 2 is an antibacterial agent having a particle diameter of 16 μm. Further, as shown in FIG. 2, the antibacterial agent 2 carries an antibacterial component 4 (silver thiosulfato complex salt) with silica gel 3 (particle size 16 μm) as a base material. 1% of the antibacterial agent having the above-mentioned constitution was kneaded into ABS resin, and parts were prepared by injection molding. Then, as a swelling confirmation test of the resin surface due to water absorption, 3
After dipping for one day, the product was taken out and visually evaluated. As a result, the appearance was equivalent to that before the test, and it was possible to prevent the appearance defect such as the occurrence of minute bulges.

As shown in FIG. 3, 5 is an antibacterial agent (particle size 50 μm) coated with a hydrophobic resin (tetrafluoroethylene type).
FIG. 4 shows the detailed contents of the antibacterial agent. However, when the hydrophobic resin is coated, the pore surface of the silica gel surface supporting the antibacterial component is not entirely coated. Then, 1% of the antibacterial agent having the above-mentioned constitution was kneaded into ABS resin, and parts were prepared by injection molding. By coating the surface of the antibacterial agent with the hydrophobic resin (tetrafluoroethylene type), the water absorption amount of the antibacterial agent base was reduced to about 1/10. Then, as a swelling confirmation test of the resin surface due to water absorption, as a result of visually observing the appearance after dipping it in ion-exchanged water at 40 ° C. for 3 days, it is equivalent to the surface state before the test, and the appearance deficiency such as the occurrence of minute swelling is prevented. did it.

Further, as shown in FIG. 5, 8 is a polypropylene resin constituting the component, and 9 is an antibacterial agent (particle diameter 50 μm). Knead 1% of the above antibacterial agent into polypropylene resin,
Parts were created by injection molding. This polypropylene has a lower elastic force of about 2/3 than that of ABS, which is a conventional component resin (bending strength: polypropylene 56 to 77 N / c.
m ² , ABS 42 to 56 N / cm ² ), a soft resin. Then, as a test for swelling of the resin surface due to water absorption, the appearance was visually evaluated after being immersed in ion-exchanged water at 40 ° C. for 3 days. I was able to prevent it.

[0020]

As is apparent from the above description, the present invention is
By kneading an antibacterial agent having a particle size smaller than 20 μm into the resin-made parts of the refrigerator, the expansion degree is small even if the base material absorbs water, and the appearance is not swelled visually, which is effective in preventing appearance defects. .

Further, by kneading the antibacterial agent coated with the hydrophobic resin into the internal parts of the refrigerator made of resin, the water absorption of the base material is reduced to prevent the expansion and prevent the defective appearance.

Further, by using polypropylene as the resin of the resin-made parts in which the antibacterial agent of the refrigerator is kneaded, the swelling returns to its original state even if the resin swells and the defective appearance is prevented. There is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of internal parts showing a first embodiment of the present invention.

2 is a cross-sectional view of the main part of FIG.

FIG. 3 is a cross-sectional view of internal parts showing a second embodiment of the present invention.

4 is a cross-sectional view of the main part of FIG.

FIG. 5 is a cross-sectional view of internal parts showing a third embodiment of the present invention.

6 is a cross-sectional view of the main part of FIG.

FIG. 7 is a cross-sectional view of components in a kneading chamber according to a conventional example.

[Explanation of symbols]

 1 parts composition ABS resin 2 antibacterial agent 3,6 silica gel 4 antibacterial component 5 antibacterial agent coated with hydrophobic resin 7 hydrophobic resin 8 parts composition polypropylene resin 9 antibacterial agent

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Matsumoto 4-2-5 Takaidahondori, Higashiosaka-shi, Osaka Prefecture Matsushita Refrigerating Machinery Co., Ltd.

Claims (3)

[Claims] 1. A refrigerator in which an antibacterial agent having a particle size of less than 20 μm is kneaded into resin-made internal parts of a refrigerator. 2. A refrigerator in which an antibacterial agent coated with a hydrophobic resin is kneaded into the resin-made internal parts of the refrigerator. 3. A refrigerator in which polypropylene is used as a resin for a resin-made internal storage part in which an antibacterial agent of a refrigerator is kneaded.