JPH09262802A - Warp-prevented wooden board or flash panel using the wooden board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a product durable for a long period and to inexpensively prevent warpage from being generated by sticking a synthetic resin film incorporated with a powdery or a short fiber-like metal or a synthetic resin film with a metallized film on a sheet-like base material. SOLUTION: In a wooden plate-like body prepd. by sticking a synthetic resin film 4 incorporated with a powdery or a short fiber-like metal or with a metallized film, even when heat of the solar heat or an air conditioner is emitted locally on the surface sticked with the film 4, as the synthetic resin film 4 has excellent thermal conductivity, the local temp. difference is unified to make the difference in expansion coefficient disappear to prevent warpage from occurring. In addition, the warpage is prevented from occurring in a flush panel prepd. by using the wooden plate-like body l prepd. by sticking a synthetic resin film 4 incorporated with a powdery or a short fiber-like metal or with a metallized film and there exists no fear of giving obstacle even when the flush panel 2 is used as a door.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp-prevented wooden board or a flash panel using the wooden board.

[0002]

2. Description of the Related Art Conventionally, plywood, particle board, and medium density fiberboard (hereinafter referred to as MDF) are coated with paint such as vinyl acetate resin emulsion on both sides to prevent warping, or polyethylene film, polyethylene film and paper. It was performed that the thing which laminated | stacked was stuck. That is, it is considered that the warp of the plate-like body is largely due to the difference in water content between the front and back surfaces of the plate-like body or the difference in linear expansion due to heat. It has been practiced to apply a paint such as the above, or to attach a polyethylene film or a laminate of polyethylene and paper.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention As a result of detailed examination of the cause of the warp of the plate-shaped body, the phenomenon of the warp of the plate-shaped body is largely caused not only by the humidity difference but also by the temperature difference. Moreover, they have found the cause of the local temperature difference of the plate-like body and have reached the present invention. That is, coating of a coating such as the above vinyl acetate resin emulsion, or a wood-based plate-like body such as a polyethylene film or a sheet of a polyethylene film laminated with paper on both front and back surfaces, particle board, MDF, or the wood-based material Although the flash panel using the plate-shaped body can suppress the occurrence of warpage due to the intrusion of moisture into the plate-shaped body,
When the heat of the air conditioner, solar heat, etc. locally hits the plate or flash panel, it is not possible to deal with the warpage caused by the difference in the linear expansion coefficient between the part that is hit and the part that is not hit. Met. The present invention has been made in view of the above-mentioned problems of the prior art, and is a wood-based board such as plywood, particle board, MDF, and corrugated cardboard that can withstand long-time use and can prevent the occurrence of inexpensive warpage. An object of the present invention is to provide a shaped body and a flash panel using the wooden board.

[0004]

According to the present invention, a synthetic resin film containing a powdery or short fiber metal or a synthetic resin film having a metal vapor deposition film is attached to a plate-shaped substrate. The present invention provides a wood-based plate-like body with warpage prevention, characterized in that the powdery or short fiber metal or the metal of the vapor deposition film is aluminum, copper, iron or a mixture thereof. And a synthetic resin film, wherein the synthetic resin film is made of an olefin resin, and a warp-prevented wooden plate is provided. Made of polyethylene or polypropylene film with metal-deposited or vapor-deposited metal, the outer layers on both sides of which are ethylene vinyl acetate copolymer, ethylene-
A synthetic resin film is provided which is a film made of one or a mixture of two or more kinds of acrylic acid ester copolymer or ethylene-methacrylic acid ester copolymer, and which is provided with a warp-prevented wooden board. However, the core layer is made of polyethylene or polypropylene film,
The intermediate layers on both sides are made of nylon or ethylene vinyl alcohol copolymer film with a powdered or short fiber metal added or metal evaporated film, and the outermost layers on both sides are made of ethylene vinyl acetate copolymer film. A wood-based plate-like body with warp prevention is provided, wherein the wood-based plate-like body with warp-prevention is adhered to both surfaces of a core material or a frame material forming a panel. A flash panel is provided.

That is, according to the present invention, a wood-based board in which an appropriate amount of powdery or short fiber metal is mixed, or a synthetic resin film having a metal vapor-deposited on the surface thereof is adhered to at least one surface of a plate-like substrate. A flash panel in which a wood-like material or the wood-based plate-shaped material is attached to both sides of a panel core material or a panel frame material, and high heat conductivity is imparted to the surface of the wood-based board-shaped material. Even if there is a local difference in temperature, the temperature difference disappears in a short time, and the expansion becomes uniform,
The occurrence of warpage is prevented. Furthermore, since a synthetic resin film having a powdery or short-fibrous metal added to a wood-based plate or having a metal vapor deposition film blocks moisture or moisture, it may warp due to moisture or moisture. It can be prevented.

[0006]

Embodiments of the present invention will be described in detail below with reference to the drawings. First, FIG. 1 is a cross-sectional view of a warp-prevented wooden board 1 according to the present invention.
A synthetic resin film 4 having a powdery or short fiber metal added or a metal vapor-deposited metal is adhered to both sides of a plate-like substrate 3 made of particle board, MDF and cardboard.

FIG. 2 shows a wood-based plate-shaped body 1 in which a synthetic resin film 4 to which a powdery or short fiber-shaped metal is added or a metal vapor-deposited film is adhered to both sides of a plate-shaped substrate is used as a core material 5. FIG. 6 is a partial cross-sectional view of the flash panel 2 attached to both sides via an adhesive.

Examples of the powdery or short fiber metal added to the synthetic resin film or the metal to be deposited include aluminum, iron, copper, gold, silver and the like having high thermal conductivity, or alloys or mixtures of these metals. However, aluminum, iron, and copper are preferable in terms of cost. The powdery or short fiber metal is preferably surface-treated to prevent oxidation. In the case of a powder, the shape and size of each powder are not limited, but a diameter of 5 to 100 μm, particularly 10 to 80 μm is preferable, and a fiber of 5 to 100 μm, particularly 10 to 80 μm is preferable. The length is preferably 20 mm or less, and particularly preferably 10 mm or less for easy handling. The amount of the powdery or short fiber metal mixed is 0.1 to 1 with respect to 100 parts by weight of the resin composition.
0 parts by weight, particularly 0.5 to 5 parts by weight is preferred. As a method of depositing a metal on a synthetic resin film, there are a vacuum vapor deposition method, a sputtering method, an ion plating method and the like. The vapor deposition film of metal is 0.05 to 0.6 μm, especially 0.07 to
A thickness of 0.3 μm is preferred.

As a method for producing a synthetic resin film to which the powdery or short fiber metal is added, an appropriate amount of powdery or short fiber metal is added to and mixed with a synthetic resin raw material,
The film is supplied to an extruder such as an inflation method or a T-die method to form a film by a general method. Further, the film obtained by the above method is adhered to a plate-like substrate via an adhesive, but in order to improve the adhesiveness of the film, a resin excellent in adhesiveness to the outer layer of the synthetic resin film,
That is, it is preferable that the film is made of one kind or a mixture of two or more kinds of ethylene vinyl acetate copolymer, ethylene-acrylic acid ester copolymer or ethylene-methacrylic acid ester copolymer. In particular, ethylene vinyl acetate copolymer is preferable, and the vinyl acetate content is preferably 15 to 40% by weight, more preferably 18 to 35% by weight. Further, it is preferable to use a multi-layer film having a layer made of nylon or EVOH resin in order to impart a moisture permeation preventive property to the synthetic resin film attached to the plate-shaped substrate.
The above-mentioned multilayer film is formed into a film by introducing resins having respective functions into a multilayer extruder. It is preferable to add a powdery or short fiber metal to each layer of the above-mentioned multilayer film from the viewpoint of increasing the thermal conductivity of the entire film, but only the thickest layer in the multilayer film is powdery or short fiber-like. A metal may be added. In the case of using a synthetic resin film having a metal deposited thereon, the synthetic resin film is formed into a film and then the metal is deposited, and then a film having excellent adhesion is laminated on both surfaces of the film by a dry lamination method or a wet lamination method. The obtained synthetic resin film is attached to a plate-shaped substrate by a roll pressing method or the like using a vinyl acetate adhesive or the like.

In order to prevent the warp due to the temperature difference between the inside and the outside of the wood-based plate-like body obtained by sticking the synthetic resin film to the plate-like base material or the local temperature difference, the powdery form described above is used. Alternatively, it is most preferable to laminate a synthetic resin film having a short fibrous metal added thereto or a metal vapor-deposited film on both sides of the plate-shaped substrate, but even when laminating only one surface, the laminated surface The temperature difference on the entire surface or locally is made uniform and dispersed in a short time through the laminated surface, so that the warpage is prevented.

The synthetic resin film to which the powdery or short fiber metal is added or which has a metal vapor deposition film is not particularly limited, but inexpensive olefin resin such as ethylene resin and propylene resin is available. Although suitable, it is also possible to use those resins having improved adhesiveness. That is, it is obtained by graft-copolymerizing a monomer having a carboxyl group as a polar group such as maleic acid, fumaric acid, acrylic acid, and methacrylic acid onto polyolefin such as polyethylene and polypropylene. For example, ethylene-acrylic acid, ethylene-methacrylic acid, and ethylene. -Acrylic acid esters can be mentioned as a representative example.

Next, a synthetic resin film having the powdery or short fiber metal added or having a metal vapor deposition film is adhered to the plate-like body and adhered to both sides of the core material or frame material of the flash panel. The above-mentioned plate-like body is attached via the agent to form a flash panel. 20 to 35 g / m 2 is further added to the surface of the plate-like body to which the powdery or short fiber metal is added or a synthetic resin film having a metal vapor deposition film is attached.
² Attach the thin paper with an adhesive to the surface that will be the surface of the flash panel, or to both surfaces. It is preferable to attach a thin paper, on which a pattern such as a wood grain pattern or an abstract pattern is printed, to the surface to be the surface of the flash panel, since this imparts cosmetic properties. The flash panel is used for various purposes such as wall materials, doors and furniture.

[0013]

EXAMPLES The present invention will be described in detail below with reference to examples. The degree of warpage was visually observed. [Example 1] Polyethylene obtained by adding 1.5 parts by weight of aluminum powder having an average particle diameter of 10 µm to 100 parts by weight of low-density polyethylene having a density of 0.920 g / cm ³ and a melt index of 2.0 g / 10 minutes was used as a core layer. (Thickness 30μ
m), and a multilayer film having an ethylene vinyl acetate copolymer having a vinyl acetate content of 18% by weight and a density of 0.932 as a surface layer (each 5 μm) on both sides thereof was formed by an inflation method. The film was attached to both sides of a MDF having a thickness of 3 mm, a width of 900 mm and a length of 1800 mm with a vinyl acetate adhesive. The MDF to which the multilayer film was adhered was locally irradiated with an infrared lamp of 600 W at a distance of 50 cm for 24 hours only on one surface in a room at 23 ° C. and a relative humidity of 50%, but no visible warpage occurred. It was

Example 2 Ethylene content 3 wt%, melt index 6.5 g / 10 min, density 0.90 g /
cm ³ of ethylene-propylene copolymer was used as the core layer (thickness 20 μm), the ethylene content was 44 mol%, the melt index was 3.5 g / 10 min, and the density was 1.1.
4 g / cm ³ ethylene vinyl alcohol copolymer 10
The copolymer obtained by adding 1.5 parts by weight of aluminum powder having an average particle size of 10 μm to 0 part by weight is used as an intermediate layer (10 μm each).
m), and a multilayer film having an ethylene vinyl acetate copolymer having a vinyl acetate content of 18% by weight and a density of 0.932 as a surface layer (5 μm each) was formed on both sides by inflation. The multilayer film has a thickness of 3 mm and a width of 900 m
m and a length of 1800 mm were attached to both sides with a vinyl acetate adhesive. 2 MDF with multi-layer film attached
Only one surface was locally irradiated with an infrared lamp of 600 W at a distance of 50 cm for 24 hours in a room at 3 ° C. and a relative humidity of 50%, but no visible warpage occurred.

[Example 3] The MDF to which the multilayer film obtained in Example 1 was attached was attached to both sides of the panel core with a vinyl acetate adhesive to prepare a flash panel. The flash panel is placed in a room at 23 ° C. and a relative humidity of 50%, and an infrared lamp of 600 W is locally applied to only one surface of the flash panel at a distance of 50 cm.
Irradiation was performed for 24 hours at a distance from each other, but no visible warpage occurred.

Example 4 The MDF to which the multi-layer film obtained in Example 2 was attached was attached to both sides of the panel core with a vinyl acetate adhesive to prepare a flash panel. The flash panel is placed in a room at 23 ° C. and a relative humidity of 50%, and an infrared lamp of 600 W is locally applied to only one surface of the flash panel at a distance of 50 cm.
Irradiation was performed for 24 hours at a distance from each other, but no visible warpage occurred.

Comparative Example 1 A multilayer film was formed in the same manner as in Example 1 except that no powdery or fibrous metal was added or no metal was vapor-deposited. The obtained multilayer film was attached to both sides of MDF with a vinyl acetate adhesive. The MDF to which the multilayer film was attached was tested for warpage in the same manner as in Example 1. Warpage was observed in the part irradiated with the infrared lamp.

Comparative Example 2 A multilayer film was formed in the same manner as in Example 1 except that no powdery or fibrous metal was added or no metal was vapor-deposited. The obtained multilayer film was attached to both sides of MDF with a vinyl acetate adhesive. The MDF to which the multilayer film was attached was tested for warpage in the same manner as in Example 1. Warpage was observed in the part irradiated with the infrared lamp.

[Comparative Example 3] The MDF to which the multilayer film obtained in Comparative Example 1 was attached was attached to both sides of the panel core with a vinyl acetate adhesive to prepare a flash panel. The flash panel is placed in a room at 23 ° C. and a relative humidity of 50%, and an infrared lamp of 600 W is locally applied to only one surface of the flash panel at a distance of 50 cm.
Irradiated separately for 24 hours. A warp that could be visually observed from the irradiated portion of the infrared lamp was the starting point.

[Comparative Example 4] The MDF to which the multilayer film obtained in Comparative Example 2 was attached was attached to both sides of the panel core with a vinyl acetate adhesive to prepare a flash panel. The flash panel is placed in a room at 23 ° C. and a relative humidity of 50%, and an infrared lamp of 600 W is locally applied to only one surface of the flash panel at a distance of 50 cm.
Irradiated separately for 24 hours. The irradiated part of the infrared lamp was warped, and the bonded part was peeled off.

[0021]

Industrial Applicability As described above, a wood-shaped plate-like body to which a powdery or short fiber metal is added or a synthetic resin film having a metal vapor-deposited film is adhered, is attached to the adhered surface of the film by solar heat, Even when heat from an air conditioner or the like is locally applied, the synthetic resin film is excellent in thermal conductivity, so that the local temperature difference is uniformized in a short time and the difference in expansion coefficient disappears, so that the warpage occurs. To be prevented. In addition, even in the case of a flash panel using a wood-shaped plate with a powdered or short fiber metal added or a synthetic resin film having a metal vapor deposition film attached, warpage is prevented just as with the above plate. Even if the flash panel is used for a door, a wall surface, etc., it does not cause any trouble.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a warp-prevented wooden board.

FIG. 2 is a cross-sectional view of a flash panel using the warp-prevented wooden board.

[Explanation of symbols]

 1 Wood-based plate-shaped body 2 Flash panel 3 Plate-shaped base material 4 Synthetic resin film 5 Core material

Claims (6)

[Claims] 1. A wood material which is prevented from warping, characterized in that a synthetic resin film to which a powdery or short fiber metal is added or a synthetic resin film having a metal vapor deposition film is attached to a plate-shaped substrate. System plate. 2. The wood board with warpage prevented according to claim 1, wherein the powdery or short fiber metal or the metal of the vapor deposition film is aluminum, copper, iron or an alloy or mixture thereof. Shape. 3. The warp-prevented wooden board according to claim 1, wherein the synthetic resin film is made of a polyolefin resin. 4. A synthetic resin film comprising a polyolefin film having a core layer to which a powdery or short fiber metal is added or having a metal vapor deposition film, and outer layers on both sides of the film are ethylene vinyl acetate copolymer and ethylene. A warp-prevented wood board according to claim 1 or 3, which is a film comprising one or a mixture of two or more of an acrylic ester copolymer or an ethylene-methacrylic ester copolymer. Shape. 5. A synthetic resin film having a core layer made of polyethylene or polypropylene film, and an intermediate layer on both sides thereof having a powdery or short fiber metal added thereto or a metal vapor deposited nylon or ethylene vinyl alcohol copolymer film. The wood-based plate-like body with warpage prevented according to claim 1, 3 or 4, characterized in that it is made of a polymer film and the outermost layers on both sides thereof are made of an ethylene vinyl acetate copolymer film. 6. A flash panel, characterized in that the warp-prevented wood-based plate-like body according to any one of claims 1 to 5 is attached to both surfaces of a core material or a frame material forming the flash panel. .