JPH11198263A - Heat insulating corrugated board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a heat insulating corrugated board providing the heat insulation properties for the corrugated board without changing the basic structure and a material for the corrugated board and enlarging the range of use to be regenerated and with little effect to the environment at the time of throwing away and burning the same. SOLUTION: An opening 3 of a space formed between a liner 1 and a liner 2 of a heat insulating corrugated board is sealed by sticking a tape 6 and air sealed in the sealed space 4. As the closing method for the opening 3, the method of covering the opening 3, pressure welding the opening 3, filling a filler into the opening 3 or the like is applied, and also in the case of a plastic corrugated board, the thermoforming of the opening 3 or the like is available.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating cardboard having improved heat insulating properties.

[0002]

2. Description of the Related Art Conventional cardboard has a low heat insulating property, and thus its use has been mainly used as a container for objects that do not require temperature control.

[0003]

Although corrugated cardboard is mainly used as a container such as a cardboard box, it is not suitable for transportation or storage of objects requiring temperature control because of its low heat insulating property. In such cases, synthetic resin materials such as styrene foam are often used, and environmental pollution during disposal or incineration has become a social problem.

The present invention focuses on the heat insulating properties of air, and by adding heat insulating properties to the cardboard without changing the basic structure or the material of the cardboard, expands the use as a material or a product, and enables the cardboard to be recycled. It is another object of the present invention to provide an insulated cardboard that has little effect on the environment when disposed and incinerated.

[0005]

In order to achieve the above object, the heat insulating cardboard of the present invention comprises a liner 1 and a liner 2.
The opening 3 of the space formed therebetween is sealed, and air is sealed in the sealed space 4 to improve the heat insulating property by the heat insulating effect of the sealed air layer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings.

FIGS. 1 and 3 show a heat insulating cardboard in which the opening 3 of the space formed between the liner 1 and the liner 2 is covered and sealed with a tape 6, and air is sealed in the closed space 4. For comparison, FIG. 2 is a perspective view of a conventional cardboard. Examples of the method of sealing the opening 3 include covering the opening 3, crimping the opening 3, and filling the opening 3 with a filler. In the case of plastic cardboard, furthermore, thermoforming the opening 3, and the like. However, the purpose of the sealing method can be achieved as long as it can prevent the enclosed air and the outside air from entering and exiting.

[0008] Further, since the present invention is characterized in that air is sealed in a closed space inside a corrugated cardboard, the sealing of the opening 3 includes a case where a space leading to the opening 3 is partitioned and sealed.

A cardboard having a multilayer structure such as a double-sided cardboard or a double-sided cardboard, or a cardboard having a larger space formed between the liner 1 and the liner 2 can be expected to have a heat insulating effect.

As for the material, paper or plastic conventionally used as a cardboard material is preferable because of its low cost, but paper is more preferable in terms of environmental protection. The plastic corrugated cardboard mentioned here includes a parallel rib type corrugated cardboard.

In the heat insulating cardboard constructed as described above, the opening 3 of the space formed between the liner 1 and the liner 2 is closed, and the air sealed in the closed space 4 produces a heat insulating effect. .

In order to confirm the improvement of the heat insulation, the opening is 40
After placing 1 kg of ice in a 2 cm thick, thermally insulated container made of styrofoam having a size of cm × 25 cm, height 10 cm, and then closing the container opening with a heat insulating cardboard having a length and width of 44 cm × 29 cm and a thickness of 6 mm. The temperature change in the space inside the container was measured under the conditions of an external temperature of 25 ° C. The styrofoam container is precooled at 5 ° C. The same measurement was performed for a conventional cardboard.

After the styrofoam containers were sealed, the space temperature in the containers was measured to be about 11 ° C. After that, the internal temperature of the styrofoam container is set to a temperature difference of 1
The time required for the temperature to reach 0 ° C., that is, the time when the temperature in the container reached 15 ° C., was about 16 hours for the adiabatic cardboard and about 4 hours for the conventional cardboard.

In this measurement temperature range, the heat transfer rate when using heat insulating corrugated cardboard is about one-fourth that of normal corrugated cardboard, in other words, the heat insulating performance is almost quadrupled.
Improved heat insulation is observed.

[0015]

The present invention is configured as described above, and has the following effects.

The heat insulating property is improved as compared with the conventional cardboard.

By giving heat insulation to the cardboard,
In addition to the conventional uses, it is possible to expand the use as a cardboard having heat insulating properties.

Since the heat insulating property of the air is used, the heat insulating property can be obtained without adding a new heat insulating material to the conventional cardboard.

Compared with other synthetic resin heat insulating materials, paper materials can be recycled, and the effect on the environment at the time of disposal or incineration can be reduced.

Compared with the conventional cardboard, there is no change in the basic structure or the material, so that there is no need for a significant change in the manufacturing and processing equipment of the cardboard.

It is inexpensive compared to other synthetic resin heat insulating materials.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat insulating cardboard according to an embodiment of the present invention.

FIG. 2 is a perspective view of a conventional cardboard.

FIG. 3 is an enlarged cross-sectional view of an opening of a heat insulating cardboard according to an embodiment of the present invention.

[Explanation of symbols]

 1, 2 liner 3 opening 4 closed space

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[Procedure amendment]

[Submission date] June 11, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

[0017] By giving heat insulation to the cardboard,
In addition to conventional uses, for example, instant cup noodles and soups
Containers, packs of juice, milk, etc., insulation for buildings and vehicles
For example, it is possible to expand the use as a cardboard having heat insulation.

Claims (1)

[Claims] 1. A heat insulating cardboard in which an opening (3) in a space formed between a liner (1) and a liner (2) is sealed, and air is sealed in the sealed space (4).