JP2002037330A - Packing container made of foamed synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing container made of foam synthetic resin showing both a superior thermal insulating property and a cold insulating property and capable of keeping its cold state for a long period of time. SOLUTION: This packing container is comprised of a thick-walled box including a box main body 2 and a lid member 5 made of hard foamed synthetic resin, and a thin-walled inner bag 6 installed inside the box for use in storing a cold item 7. The inner bag 6 is formed by flexible synthetic resin and processed with a treatment for shutting off radiation beam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a foamed synthetic resin packaging container. More specifically, the present invention relates to a foamed synthetic resin packaging container which has excellent heat insulation properties and coolness and can be kept cool for a long time.

[0002]

2. Description of the Related Art In recent years, foamed synthetic resin containers have become lighter,
Since it is hygienic and has excellent heat insulation properties, it is widely used as a packaging container for fresh foods such as fish and shellfish that require freezing or refrigeration.

[0003] A foamed synthetic resin packaging container is made of a foamed synthetic resin such as foamed styrene in the shape of a box, and is made of a thick-walled container to ensure strength or heat insulation. It is housed with coolant and used for transportation and storage.

Such a foamed synthetic resin packaging container is an excellent cold storage container having low thermal conductivity, but the synthetic resin forming the foam is usually transparent, and when foamed, apparently white and opaque. However, there is a problem that heat radiation is transmitted through a large amount and heat enters from the outside, thereby impairing the cool keeping property.

[0005] A technique has been proposed in which a cold insulator is placed in a colored inner bag in order to block the transfer of heat due to radiation and improve heat insulation, and this is stored in a foamed synthetic resin packaging container (Japanese Patent Laid-Open No. Hei 11 (1999)). -245974).

However, since the drainage holes are formed in the foamed synthetic resin packaging container and the inner bag, outside air passes through the inside of the container and impairs the heat insulating property. In addition, there is a problem that blood or the like is mixed into water leached from the packaging container, thereby causing odor and contaminating the surroundings.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a foamed synthetic resin packaging container which is excellent in heat insulation and coolness and can be kept cool for a long time.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a packaging container made of a foamed synthetic resin which has a structure in which an external wind does not blow through, prevents radiation from being transmitted, and allows long-term cold insulation. , Consisting of a thick box consisting of a box body and a lid made of a hard foamed synthetic resin, and a thin inner bag loaded inside and containing a cold insulator, and the inner bag is a flexible synthetic An object of the present invention is to provide a foamed synthetic resin packaging container characterized by being formed from a resin and subjected to a treatment for blocking radiation.

The present invention also relates to a packaging container made of a foamed synthetic resin as described above, wherein the inner bag is formed from a synthetic resin into which a powder of a radiation-reflective substance is kneaded, wherein a metal or a metal oxide is used as the radiation-reflective substance. The above-mentioned foamed synthetic resin packaging container, the inner bag was made of the above-mentioned foamed synthetic resin packaging container formed of a composite film on which a radiation-reflective substance was deposited, and aluminum was used as the composite film on which the radiation-reflective substance was deposited. An object of the present invention is to provide a foamed synthetic resin packaging container using a vapor-deposited film.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The foamed synthetic resin packaging container of the present invention is formed of a thick synthetic resin foam. As the synthetic resin forming the foamed synthetic resin packaging container, foamed polystyrene, foamed polyethylene, foamed polypropylene, hard foamed urethane resin, or the like can be used. Among them, expanded polystyrene is preferred.

As shown in FIG. 1, a packaging container 1 has a box body 2 formed in a box shape by thick side walls 3 and a bottom plate 4.
And the lid 5 formed in a shape to be coupled to the box body 2 are used in combination.

It is desirable that the lid 5 has a fitting structure so as to be connected to the box main body 2. In order to prevent lateral displacement when the packaging containers 1 are stacked and transported vertically and stabilize them, Preferably, the upper edge of the side wall 3 and the lid 5, and the lid 5 and the back surface of the bottom plate 4 of the box body 2 are formed so as to form a fitting structure 10.

In the present invention, the inner bag 6 is loaded inside the packaging container 1. The inner bag 6 is made of a flexible synthetic resin, and is made of a polyolefin film such as a high-pressure low-density polyethylene, a linear low-density polyethylene, an ethylene-vinyl acetate copolymer, polypropylene, or a vinyl chloride, polyester, polyamide, or the like. It can be formed using a film.

The inner bag 6 is subjected to a process of blocking transmission of radiation. The treatment for blocking the transmission of radiation can be performed by kneading powder of a radiation-reflective substance that reflects radiation, particularly infrared rays and near-infrared rays, into a synthetic resin. As the powder of the radiation reflective substance, metal powder such as aluminum, iron and copper, and oxide powder of metal such as titanium oxide and zinc oxide can be used. The addition amount of the radiation reflective substance can be arbitrarily selected according to the purpose, but is generally 1 to 30% by weight, preferably 3 to 20% by weight.
% By weight.

Further, a composite film in which a radiation reflecting material such as aluminum is laminated on a film made of a synthetic resin can be used. As a method of laminating the radiation reflective substance, a method of attaching a synthetic resin film to a metal foil, or vacuum deposition or sputtering can be used. Among them, a synthetic resin film obtained by evaporating aluminum is preferable.

The inner bag 6 accommodates the insulated material 7 and is loaded into the box body 2, and as shown in FIG. It is used by folding the upper part of the bag 6 so as to cover the cool insulator 7. Therefore, the inner bag 6 is formed so as to have flexibility and the box body 2
Or more, preferably 1.5 times the depth of the box body 2
A bag having a depth of about 3 times is used.

The inner bag 6 can be provided with a plurality of small holes for drainage at the bottom. By providing a small hole for drainage, when taking out the insulated material, pulling it up while holding the inner bag 6 drains the water inside and only the insulated material can be taken out. This eliminates the need for insertion. However, no water drain hole is formed in the box body 2.

The foamed synthetic resin packaging container 1 of the present invention can be used for storing and transporting fresh foods such as fish and shellfish, vegetables, etc., which need to be kept cool. In particular, sardines, swordfish, mackerel,
It is suitable for storage and transportation of fish that can be stored in ice water while avoiding cooling unevenness such as horse mackerel and bonito.

When using the foamed synthetic resin packaging container 1 of the present invention, the inner bag 6 is loaded into the box main body 2, and a cold insulator 7 is put into the inner bag 6 together with ice. Is folded to cover the cold insulator, and the lid 5 is put on it to perform packaging.

[0020]

As described above, the present invention has the above-mentioned construction, so that the insulated material is shut off from the outside air, the insulated effect is not hindered by the outside wind, and the generated liquid is stored and transferred in the liquid receiving main body. Therefore, the problem that odor remains in the surroundings can also be solved.

Further, since the radiation transmitted through the box body or the lid made of the foamed synthetic resin is blocked by the inner bag,
It is excellent in cold insulation and can keep cold for a long time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a foamed synthetic resin packaging container of the present invention.

FIG. 2 is a cross-sectional view of the foamed synthetic resin packaging container taken along line AA.

[Explanation of symbols]

 1: Packaging container made of foam synthetic resin 2: Box body 3: Side wall 4: Bottom plate 5: Lid 6: Inner bag 7: Cooling material 10: Fitting structure

Claims (5)

[Claims] 1. A thick box composed of a box body and a lid formed of a hard foamed synthetic resin, and a thin inner bag which is loaded therein and accommodates a cold-retained material. A packaging container made of a foamed synthetic resin, wherein the packaging container is made of a flexible synthetic resin and is subjected to a treatment for blocking radiation. 2. A packaging container made of a foamed synthetic resin according to claim 1, wherein the inner bag is formed of a synthetic resin kneaded with a powder of a radiation reflecting substance. 3. The foamed synthetic resin packaging container according to claim 2, wherein the radiation-reflective substance is a metal or a metal oxide. 4. The foam synthetic resin packaging container according to claim 1, wherein the inner bag is formed of a composite film on which a radiation reflective substance is deposited. 5. The packaging container according to claim 4, wherein the composite film on which the radiation-reflective substance is deposited is an aluminum-deposited film.