JP2002029575A - Heat insulated box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulated box which is formed of a nature-friendly material, assembled when in use and disassembled after the use, and requires little space when in storage. SOLUTION: This heat insulated box is formed by assembling paper with a foam mainly consisting of a vegetable material stuck to a predetermined part thereof. Alternatively, the box is formed by assembling paper, and the foam is fitted to the box.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box having heat insulating properties for use in keeping frozen or fresh food, fresh food, cooked food or beverage.

[0002]

2. Description of the Related Art Conventionally, as containers for keeping food or beverages warm or cold, containers made of foamed plastic, especially containers made of styrene foam, have been frequently used. In particular, Styrofoam containers have been widely used for various applications because they are relatively inexpensive to measure.

[0003] Styrofoam thermal insulation containers are often used only once, that is, as one-way containers, because oil and odor in food are relatively easy to permeate. However, in recent years, environmental issues and resource saving issues have been highlighted, and the use of styrofoam containers has been regarded as a problem.

Japanese Patent Application Laid-Open No. 09-066971 discloses a cold box for agricultural and marine products obtained by adding moisture and glue to natural fibers such as paper and cotton as a cold box instead of a foamed plastic container. However, this is considered to have a difficulty in productivity because water is evaporated after molding, and has not surpassed a foamed plastic container.

[0005] In addition, folding cold storage containers have been proposed in JP-A-2000-153833 and JP-A-2000-130924. Each of these uses a wall material and a bottom material having a double structure having a heat insulating layer inside, and uses a foamed plastic for the heat insulating layer.

[0006]

As described above, as a heat insulating and cooling container or as a heat insulating material for a heat insulating and cooling container,
Styrofoam, which is frequently used, has been focusing on environmental issues and resource saving issues. Even if it is left in the natural world, it does not easily disintegrate or disappear, and its appearance is also a problem. Also, in the case of extinguishing, the furnace is easily damaged due to the high heat of combustion.

[0007] Styrofoam heat and cold storage containers that are generally used are almost all-in-one boxes. In a factory that manufactures the boxes and in a business establishment that uses the boxes as materials for their products, this box is used. The need for a large space to store the data is a burden.

[0008] An integrated styrofoam heat insulation / cooling container is provided by placing styrofoam particles in a mold and heating and foaming them.
Molded into containers. If a new container is needed for that purpose, it is necessary to make a mold first. It takes considerable cost and time to make this mold.

Focusing on these points, the present invention has the advantage that the space required for storage can be greatly reduced before and after use as a heat and cold storage container, and the box is made of paper and paper. The present invention relates to a heat-retaining cool box that is naturally gentle because it is a foam containing a plant material as a main component, and has a low calorie during combustion and is less likely to damage a furnace.

[0010]

Means for Solving the Problems In order to solve the above problems, a foam mainly composed of a plant material is used as a main heat insulating material, and paper is used as a material serving as a box, By using these two materials in combination, we have devised an insulated box that is gentle on nature and can greatly reduce the storage space.

The type of paper used for the box can be changed depending on the use of the heat and cold box. When rigidity is required, cardboard may be used. If not,
Paperboard may be used. Also, the paper can be used not only on the outside, but also on the innermost layer to wrap the foam if necessary.

Foams containing a vegetable material as a main component include starches such as corn starch and potato starch, flour, okara, paper and wood as vegetable materials, mixed with polypropylene and water in an extruder, and heated and melted. rear,
It can be obtained by extrusion foaming.

The shape of the foam may be a plate-like foam having a thickness of about 1 cm or more, or a sheet-like foam having a thickness of about 2 to 6 mm, depending on the use of the heat insulating and cooling box. . The desired foam can be obtained by changing the shape of the die of the extruder.

In addition, the foam mainly composed of a vegetable material may be a biodegradable resin such as bionole (a biodegradable resin manufactured by Showa Polymer Co., Ltd.), polylactic acid resin and poval, instead of the above polypropylene. The use results in a foam that is completely biodegradable.

There are several methods for producing a heat-insulated box from the paper and the foam, and any method may be selected as needed. A first method is to bond the foam to a designated portion of paper in advance so that the foam covers the inner surface of the box when assembled into a box.

The second method is a method in which a box is first made only of paper, and then the foam is mounted on the inner surface of the box. At this time, an adhesive may be applied to the foam, and the foam may be attached to paper. Alternatively, the foams can be bonded to each other.

The third method is a method of simultaneously assembling the box and mounting the foam, such as mounting a foam between the paper and paper when assembling the paper box.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings showing examples.

[0019]

[Embodiment 1] FIG. 1 is a three-dimensional view of a heat and cool box according to a first embodiment. FIG. 2 is a three-dimensional view of a lid used for the thermal insulation box shown in FIG.

In FIG. 1, reference numeral 1 denotes a cardboard which constitutes the outside of the heat insulation and cooling box. 2 is a foam made of corn starch and polypropylene. In FIG. 2, 3 is a cardboard, and 4 is the same foam as 2. The foam 4 of the lid shown in FIG. 2 is adapted to enter the inside of the box of FIG.

In FIG. 1, the foam 2 is not bonded to the cardboard 1. The foams are not glued together. In FIG. 2, the foam 4 is bonded to the cardboard 3.

[0022]

[Embodiment 2] FIG. 3 is a three-dimensional view of an insulated box according to a second embodiment. FIG. 4 is a plan view before assembling the thermal insulation box of the second embodiment. In FIG. 3, 5 and 7 are paperboards, and 6 and 8 are foams made of coast starch and bionore. In FIG. 4, a foam made of coast starch and bionole is adhered to the hatched portion.

In FIG. 4, a broken line 9 is a cut portion, and a broken line 10 is a portion that is devised so as to be easily bent.

The heat insulation and cooling box of the present invention comprises paper and a foam mainly serving as a heat insulator. The foam is mainly composed of a vegetable material, and the conventional heat insulation and cooling box made of styrene foam. It is an environmentally friendly product compared to. In addition, the storage space of the boxes before and after use can be significantly reduced by the assembly type.

[Brief description of the drawings]

FIG. 1 is a three-dimensional view of a heat insulating and cooling box of the present invention, showing Example 1 made of cardboard and a foam mainly composed of a vegetable material.

FIG. 2 is a three-dimensional view of a lid for the heat insulating and cooling box of FIG. 1 showing the first embodiment of the present invention.

FIG. 3 is a three-dimensional view of the heat insulation and cooling box of the present invention showing Example 2 consisting of paperboard and a biodegradable foam.

FIG. 4 is a plan view showing a second embodiment of the present invention before assembling the heat and cool box.

[Explanation of symbols]

1, 3 Corrugated cardboard 2, 4 Foam composed of corn starch and polypropylene 5, 7 Paperboard 6, 8 Foam composed of coaster and bionole 9 Cut 10 Folding device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E033 AA09 BA10 BA16 BB01 BB10 CA08 GA03 3E060 AA03 BC01 BC02 BC04 DA24 EA03 EA06 EA13 3E067 AA11 AB01 AB02 AB08 AB26 AC03 BA06A BB02A BB17A BB23A BC06 GA01 FA01 GA01 GA01 AJ01 BE20 FA20 GA05

Claims (4)

[Claims] 1. A heat insulation and cooling box characterized in that a foam containing 50% or more of a plant material is adhered or attached to a part or the whole surface of a box made of paper. 2. A foldable or assembling type insulated box in which a foam containing 50% or more of a plant material is bonded in advance to a part or the entire surface of a box made of paper. 3. A heat insulating and cooling box characterized in that a plate-like foam containing 50% or more of a plant material is incorporated into a folding box made of paper when the box is assembled. 4. The heat insulation and cooling box according to claim 1, wherein all of the components of the foam are biodegradable.