JP2002001736A - Manufacturing method for heat-insulating panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a heat-insulating panel wherein a foamed body which does not generate distortion is used as a core material for the surface material. SOLUTION: A space section is formed of two sheets of the surface material which are arranged on the top and the bottom with a specified interval in the horizontal direction, and a frame section which is fixed to the peripheral edge sections of the surface plates in order to form the specified interval. Then, in the space section, an expandable polyurethane composition is injected, and formed and cured for this manufacturing method of the heat-insulating panel. In such a manufacturing method, in the space, a plurality of supporting bodies having legs made of a thermoplastic resin are provided in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating panel using a foam formed by injection foaming as a core material.

[0002]

2. Description of the Related Art Insulation panels using a foam as a core material are used for bathroom panels, partitions, building exterior materials and the like.
These heat insulating panels are generally formed of two metal face materials placed horizontally and at a predetermined interval, and a frame portion made of wood, metal, synthetic resin or the like fixed to the periphery thereof. In the space portion, an injection hole is provided on the side surface, a foamable resin composition for producing a rigid polyurethane foam or the like is injected from the hole, the foamed resin composition is cured, and the heat insulating panel is integrated by the self-adhesiveness of the foamable composition. It was manufactured as.

However, the above-mentioned metal face material has a problem that the upper metal face material hangs down due to its own weight, and a good heat insulating panel cannot be obtained. Conventionally, in order to solve this problem, a plurality of block-shaped supports are attached to either the upper or lower metal surface material. By sticking in this manner, the block-shaped support did not move even by the flow of the foamable resin composition, and a good heat insulating panel was obtained.

However, the injected foamable resin composition is
In the process of foaming, the force that pushes up the upper metal surface acts, so if the metal surface is thin, there is a subtle difference in force at the boundary between where the support is and where it is not, and this is the metal surface Sometimes appeared as distortion.
In addition, when the resin to be injected involves an exothermic reaction, such as a polyurethane composition, shrinkage after curing causes a slight difference in force between the place where the support is provided and the place where the support is not provided due to shrinkage after curing. In some cases, the metal face material appeared as strain. Such distortion results in variations in the degree of light reflection, resulting in poor appearance and poor quality.

If the block-shaped support is not adhered, the support moves due to the flow of the foamable resin composition when the foamable resin composition is foamed. That is, since no stress is applied to one place, the metal face material is not applied. Although the strain tends to be small, it moves to the initial stage of foaming, so that a good heat insulating panel could not be obtained.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a foam material having a core material in which no distortion occurs in a surface material such as a metal face material.
An object of the present invention is to provide a method for manufacturing a heat insulating panel.

[0007]

As a result of intensive studies to solve the above-mentioned problems, it has been found that it is preferable that the support hardly moves at the beginning of foaming and the support moves at the end of foaming. We have learned that a heat insulating panel can be obtained. That is, the present invention provides two surface materials arranged vertically at a predetermined interval horizontally, and a frame fixed to a peripheral portion of the surface material to form a predetermined interval or a peripheral portion of the surface material. In a method for manufacturing a heat insulating panel, a foamable polyurethane composition is injected into a space formed by folding a frame formed by bending a foam, and a foaming curing is performed, a plurality of supports each having legs of a thermoplastic resin are previously arranged in the space. It has been set up.

Further, by using the support having a structure in which the legs are attached obliquely, the foamed and hardened foamable polyurethane composition shrinks to bring the upper surface material and the lower surface material closer to each other. In addition, the surface material is not distorted due to the leg bending in the horizontal direction.

[0009] The surface material referred to in the present invention is mainly a solid material, a material having a pattern engraved or painted on the surface, and is mainly used.
A metal plate such as stainless steel or aluminum, or a plastic plate such as FRP is used.

The foamable polyurethane composition referred to in the present invention is a liquid which is liquid at the time of injection, becomes viscous in the process of foaming and hardening, and finally becomes a rigid foam. One that forms a nurate foam or the like is included.

The support used in the present invention has its legs molded from a thermoplastic resin. Examples of the thermoplastic resin include a vinyl chloride resin, an ethylene resin, a propylene resin, a styrene resin, and an acrylic resin, and a vinyl chloride resin and an ethylene resin having a low softening temperature are preferable.

Since the legs formed of the thermoplastic resin are softened by the reaction heat during the foaming and curing of the polyurethane composition, the function of supporting the surface material of the support can be reduced at this point. By such an action, the support is easily moved between the two surface materials.

The support used in the present invention is preferably formed entirely by legs. In this way, the flow of the expandable polyurethane composition and the force to move the support due to the spread of the expandable polyurethane composition to the periphery due to the foaming can be reduced, and as a result, the support is formed at the initial stage of foaming. Because it does not move so much, it can support the upper surface material.

The leg may have a circular or rectangular cross section, but preferably has a diameter or a side of about 2 to 5 mm. If the thickness is too large, it is not preferable because the support easily moves due to the flow of the expandable polyurethane composition and the spread of the expandable polyurethane composition to the periphery due to foaming.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a method for manufacturing a heat-insulating panel in which a foam is filled in a thin metal plate or plastic plate having a flat surface, especially a mirror-finished metal surface material. This is effective for a heat insulating panel in which a strain of 0.2 to 0.5 mm is easily generated. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of a heat insulating panel according to the present invention. In order to manufacture such a heat insulating panel, two surface materials are arranged at a predetermined interval between two heatable press plates (not shown) with their peripheral portions fixed to a frame material. Set up. Note that a support having a plurality of thermoplastic resin legs is provided on the lower surface material in advance.

Examples of the shape of the support include, but are not limited to, the following. FIG. 2 shows a support in which legs extend to the vertices of a regular tetrahedron.
FIG. 4 shows a shape in which one leg is reduced from that of FIG.
Is a shape with legs extending to the vertices of an octahedron.

FIG. 5 shows a state in which the foamable polyurethane composition is injected from the injection hole on the side surface of the heat insulating panel forming casing prepared between the press plates. The injected foamable polyurethane composition starts foaming immediately after the injection and spreads upward and to the periphery. The foaming polyurethane composition moves the support to the periphery, but in the initial stage of foaming,
The support supporting the facing hardly moves because the frictional force works. In the final stage of foaming, the foaming pressure of the foamable polyurethane composition acts to push up the upper surface material, and the frictional force is reduced. Moves toward the peripheral edge of the surface material. Even if the support moves at the end of foaming, the surface material is supported by the foaming pressure and does not hang down. FIG. 6 shows the manner of movement of the support in the heat insulating panel forming casing of the heat insulating panel thus obtained.

[0118]

As described in detail above, according to the present invention, by forming the legs of the support with a thermoplastic resin, the legs are formed by the heat of reaction of the foamable polyurethane composition. Since the support is softened and then the support is moved by the flow of the composition, stress is not concentrated at one point of the surface material, so that it is possible to obtain a heat insulating panel which can sufficiently cope with a demand for advanced surface finishing.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a heat insulating panel according to the present invention.

FIG. 2 is an example of the shape of a support used in the present invention.

FIG. 3 is an example of the shape of a support used in the present invention.

FIG. 4 is an example of the shape of a support used in the present invention.

FIG. 5 shows a state in which a foamable polyurethane composition is injected from an injection hole in a frame portion of a housing for forming a heat insulating panel.

FIG. 6 shows a state of movement of a support in a housing for forming a heat insulating panel.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B29K 105: 20 B29K 105: 20 B29L 31:00 B29L 31:00

Claims (2)

[Claims] 1. A surface member which is horizontally arranged at predetermined intervals above and below, and a frame fixed to a peripheral portion of the surface material or a peripheral portion of the surface material so as to form a predetermined interval. A method of manufacturing a heat insulating panel by injecting a foamable polyurethane composition into a space formed by folding a frame formed by bending the foamed polyurethane composition, and foaming and curing the foamed polyurethane composition.The support having legs of a thermoplastic resin in the space, A method for manufacturing a heat insulating panel, wherein a plurality of heat insulating panels are provided in advance. 2. The method according to claim 1, wherein the legs of the support having legs are inclined.