JP2506726Y2 - Composite molded product - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a composite molded article composed of a surface material having a wood veneer layer on its surface and a synthetic resin core material.
Then , the wood veneer is laminated on one surface of the metal thin plate, and the porous material layer or the fibrous material layer is laminated on the other surface, and these are integrated to form a surface material, and this surface material is formed by molding metal. When the synthetic resin core material is placed in a mold and then closely adhered to the porous material layer or the fibrous material layer of the surface material to injection- mold the synthetic resin core material, the adhesion between the surface material and the synthetic resin core material is improved, It is intended to manufacture a composite molded article having excellent durability.

[0002]

2. Description of the Related Art Conventionally, synthetic resin composite molded products having a wood grain pattern have been widely used for interior parts of automobiles, furniture, electric appliances and the like. In order to make such a composite molded product with a wood grain pattern, a wood thin plate such as a veneer wood veneer or a veneer reinforced with a non-woven fabric is used as a surface material. A method of arranging and injecting a synthetic resin as a core material and performing insert molding has been performed. By the way, the composite molded article obtained by such a method,
It is excellent in design, but if the shape of the molded product becomes complicated,
There is a problem that the wood thin plate on the surface is cracked and product defects easily occur. Alternatively, if the surface of the composite molded body is coated and then the surface is finished by buffing, the resin at the interface softens due to the friction heat during buffing,
Fine irregularities occur on the surface. Therefore, it has been necessary to perform a mirror finish by blowing up or a matte finish.

In order to solve such a problem, a method has been developed in which an aluminum thin plate is laminated and integrated on the back surface of a wood veneer as a surface material to be inserted into an injection molding die. According to this method, since the wood veneer is reinforced by the aluminum thin plate, even if it is used for a complex molded product having a complicated shape, it is not damaged and a product with a beautiful wood grain pattern is obtained. Further, even if it is buffed, it has an advantage that no fine uneven pattern appears on the surface. And in this method, in order to obtain the adhesiveness between the aluminum thin plate and the synthetic resin core material, a method of applying an adhesive on the surface of the aluminum thin plate in contact with the synthetic resin, or on the surface of the aluminum thin plate in contact with the synthetic resin A method has been performed in which aluminum is sprayed in advance and the molten synthetic resin is joined into the gap of the sprayed aluminum by an anchor effect to join them.

[0004]

However, in such a method, the adhesion between the surface material and the synthetic resin core material is not sufficient, and peeling may occur during the manufacturing process of the composite molded product or during the use of the product. There was poor durability.

The present invention has been made in view of the above circumstances. When a surface material is placed in an injection molding die and a synthetic resin is insert-molded to produce a composite molded article, the surface material is used.
It is an object of the present invention to provide a composite molded article capable of improving the adhesiveness between a wooden decorative board and a synthetic resin core material while maintaining the strength of the wooden decorative board .

[0006]

[Means for Solving the Problems]Composite molded product
Uses a thin metal plate as the middle layer and a wood veneer on one side of it.
Laminate and laminate porous material layer or fibrous material layer on the other side
And integrate theseThe porosity of the wooden decorative board
Injection molding synthetic resin core material on the material layer or fiber material layer
ShapedThis is the means for solving the above problems.

[0007]

Since the composite molded article of the present invention has the above-mentioned constitution , the wooden decorative board which is the surface material can obtain the reinforcing effect by the thin metal plate. And insert molding the composite molded product
When that is porous material layer or the fibers of the wood veneer
By injection molding the synthetic resin on the material layer , the molten synthetic resin penetrates into the small holes of the porous material or between the fibers of the fibrous material to obtain a sufficient anchor effect.
Therefore, sufficient adhesive strength between the surface material and the synthetic resin core material in the composite molded product can be obtained.

[0008]

The present invention will be described in detail below. FIG. 1 shows an example of a wood decorative board 1 used as a surface material of a composite molded article according to the present invention. In the drawing, reference numeral 2 is a thin metal plate, 3 is a wood single board, and 4 is a porous material. The wooden decorative plate 1 has a single metal plate 3 laminated on one surface of a thin metal plate 2 and a porous material 4 laminated on the other surface thereof by an adhesive. The porous material 4 is not limited to a single layer, but can be used by laminating two or more layers.

The thin metal plate 2 used in the present invention is made of a metal such as aluminum or steel of 0.01 to 0.5 mm.
It is possible to use a thin plate having a certain thickness. The thickness of this thin metal plate 2 is particularly 0.05 to 0.3 mm.
The range is preferably Here, if the thickness of the metal thin plate 2 is less than 0.01 mm, the effect of reinforcing the wood veneer 3 on the surface portion cannot be obtained, and if it exceeds 0.5 mm, the rigidity is too high. However, it is also possible to use the metal thin plate 4 having a thickness equal to or larger than this thickness, if necessary. Further, it is desirable that the thin metal plate 2 be subjected to a chemical conversion coating treatment in order to improve the corrosion resistance, the adhesiveness and the like.

As the wood veneer 3 used in the present invention, any material can be used, but it is preferable to use a wood grain pattern having a beautiful grain pattern. The thickness thereof is 0.15 to 0.5 mm, and preferably about 0.2 mm. Here, the thickness of the wood veneer 3 is 0.15
If it is less than 0.5 mm, there will be problems in strength, and if it exceeds 0.5 mm,
The shape following property deteriorates, and it becomes difficult to form a molded product having a complicated shape. Further, this thickness is not limited to these ranges, and can be changed depending on the material and thickness of the porous material 4.

As the porous material 4 used in the present invention, a wood veneer, a foamed resin plate (open cells), etc. can be used, and the thickness of the porous veneer 4 has a shape conforming property of the wood decorative board 1. It can be arbitrarily set within a range that does not decrease. For example, when a wood veneer is used, the same wood veneer as described above can be used.

The wood veneer 3, the metal thin plate 2, and the porous material 4 are integrated by an adhesive to form the wood decorative board 1, but the adhesive used here is not particularly limited.
However, it is preferable that the wood decorative board 1 be bonded under pressure and heat by using a heat-resistant thermosetting adhesive so that it can be subjected to the step of insert molding a synthetic resin.

In order to make a composite molded article using such a wooden decorative board 1 as a surface material, as shown in FIG. 2, for example, the wooden decorative board 1 is placed in an injection mold 6 and a porous material is prepared.
When a synthetic resin is injected onto the layer 4 , the wooden decorative board 1 is made into a mold 6
A molded product is obtained in which the wooden decorative board 1 and the synthetic resin core material 7 are integrated while being deformed along the shape of 1 to be molded into a desired shape. When this is released, a composite molded product 8 as shown in FIG. 3 is obtained. Here, in FIG. 3, reference numeral 9 indicates coating.

As shown in FIG. 4, in this composite molded article 8, the synthetic resin core material 7 is in contact with the porous material 4 of the wooden decorative board 1. And as shown in FIG. 5, the small holes 4a of the porous material 4 are formed.
The resin has entered the inside. Due to the anchor effect, the wooden decorative board 1 and the synthetic resin core material 7 are firmly bonded to each other, so that they are not separated from each other. Further, when the surface 9 of the wooden decorative board 1 is coated, buffed and mirror-finished, even if the synthetic resin core material 7 at the boundary is softened by the heat of polishing, the metal thin plate 2 is provided. Movement does not appear on the surface and fine uneven patterns do not occur. Furthermore, since the thin metal plate 2 blocks the permeation of water, a product having good moisture resistance and high durability can be obtained.

In the present invention, the same effect can be obtained by forming the wood decorative board 1 using the fibrous material 5 instead of the porous material 4 and subjecting it to insert molding. As the fibrous material 5 used here, non-woven fabric, cloth, paper, glass fiber mat or the like can be used, and the thickness thereof can be arbitrarily set within a range that does not deteriorate the shape following property of the wooden decorative board 1. You can The basis weight is 30 to 70 g / m.
² can be preferably used.

(Example 1) A thickness of 0.2 mm was obtained by using an adhesive on both sides of an aluminum thin plate 2 having a thickness of 0.3 mm and treated with a chromium phosphate oxide conversion coating.
The walnut veneers 3 and 4 were integrated together to form a three-layered wooden decorative board 1. At this time, a crosslinking urethane dispersion adhesive (manufactured by Asahi Denka Co., Ltd.) was used as the adhesive, and the coating amount was 100 g / m ² and the temperature was 150.
Adhesion was performed by pressing at 10 ° C. and a pressure of 10 kg / cm ² for 3 minutes. This wooden decorative board 1 was cut into a predetermined shape, set in an injection molding die 6, and ABS resin was injected to form a composite molded article 8. In this composite molded article 8, the wooden decorative board 1
The synthetic resin core material 7 was firmly integrated. The wood decorative board 1 was coated with a coating 9 consisting of coloring, undercoating, intermediate coating and topcoating, and then buffed to give a mirror finish, but the polished surface was smooth and no fine irregularities were observed. In a humidity resistance tester, temperature: 50 ° C, humidity: 95
%, It showed excellent durability.

(Embodiment 2) In Embodiment 1, a walnut veneer 3 having a thickness of 0.2 mm is used on one surface of the aluminum thin plate 2 and 50 g on the other surface.
A composite molded article 8 was molded in the same manner except that the acrylic non-woven fabric 5 having a unit weight of / m ² was used. At this time, the synthetic resin was injected to the acrylic nonwoven fabric 5 side. In this composite molded product 8, the wooden decorative board 1 and the synthetic resin core material 7 were firmly integrated. The wood decorative board 1 was coated with a coating 9 consisting of coloring, undercoating, intermediate coating and topcoating, and then buffed to a mirror finish, but the polished surface was smooth and no fine irregularities were observed. In a humidity resistance tester, temperature: 50 ° C,
Humidity: When kept at 95%, excellent durability was exhibited.

(Example 3) In Example 1, the walnut veneer 3 having a thickness of 0.2 mm was used on one surface of the aluminum thin plate 2 and 70 g on the other surface.
/ M ^{2 A} composite molded product 8 was molded in the same manner except that the surface matte (glass fiber mat) 5 having a basis weight was used. At this time, the synthetic resin was injected on the surface of the surface mat 5 of the surfer. In this composite molded article 8, the wooden decorative board 1 and the synthetic resin core material 7 were firmly integrated. The wood decorative board 1 was coated with a coating 9 consisting of coloring, undercoating, intermediate coating and topcoating, and then buffed to give a mirror finish, but the polished surface was smooth and no fine irregularities were observed.
In a humidity resistance tester, temperature: 50 ° C, humidity: 9
When kept at 5%, excellent durability was exhibited.

[0019]

[Effect of the Invention] As described above, the composite molding of this invention
The product is made of a thin metal plate as an intermediate layer, a wood veneer is laminated on one surface of the metal veneer, and a porous material layer is laminated on the other surface thereof. Synthetic tree on top
An oil-core material is injection-molded . Therefore, wood
Since the plate is reinforced by the thin metal plate, even if it is used in a complex molded product having a complicated shape, it is not damaged, and a beautiful molded product having a grain pattern can be obtained. Further, even if the composite molded article is painted and buffed, a fine uneven pattern does not appear on the surface due to the polishing heat. Moreover, a product having excellent water resistance can be obtained. Furthermore, since the wooden decorative board and the synthetic resin core material are firmly adhered to each other via the porous material layer or the fibrous material layer, they do not peel off, prevent product defects from occurring, and improve durability. An excellent composite molded product can be manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a wooden decorative board used for a composite molded article of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a resin is injected into an injection molding die to form a composite molded article.

FIG. 3 is a cross-sectional view of a composite molded product whose surface is coated.

FIG. 4 is a cross-sectional view of the vicinity of the surface of the composite molded product.

FIG. 5 is an enlarged cross-sectional view of a joint portion between a porous material and a synthetic resin core material.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wooden decorative board, 2 ... Metal thin board, 3 ... Wood single board, 4 ... Porous material, 5 ... Fiber material , 7 ... Synthetic resin core material, 8 ... Composite composition
Shaped item.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Ishizuka 10-1 Nakazawa-machi, Hamamatsu-shi, Shizuoka Prefecture Yamaha stock company (72) Shoichi Kaneko 10-1 Nakazawa-machi, Hamamatsu-shi, Shizuoka Yamaha stock company (56) Reference Japanese Patent Laid-Open No. 2-215526 (JP, A) Actual Development Sho-49-47418 (JP, U)

Claims (2)

(57) [Scope of utility model registration request] The method according to claim 1 the metal sheet as an intermediate layer, a wood veneer laminated on one surface thereof, by laminating a porous material layer on the other surface, of the wood veneer formed by integrating these, the porous On timber layer
Double, characterized in that formed by injection-molding a synthetic resin core material
Combined molded product . 2. The above-mentioned fiber material of a wood decorative board obtained by laminating a wood veneer on one surface of a metal thin plate as an intermediate layer, and laminating a fibrous material layer on the other surface, and integrating these. On timber layer
Double, characterized in that formed by injection-molding a synthetic resin core material
Combined molded product .