JP2963524B2 - Wire-mesh-coated synthetic resin injection molded article, method for producing the same, and use thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a synthetic resin injection-molded article integrally coated with a wire mesh, a method for producing the same, and uses thereof.

[Conventional technology]

2. Description of the Related Art Conventionally, a synthetic resin molded article having a conductor layer provided on a surface thereof has been used in the field of electronic and electric devices. For example, a parabolic antenna reflector made of synthetic resin used for satellite broadcasting and the like, whose demand is increasing in recent years, is one of them.

In such applications, as a method of applying a conductor layer to the surface of the synthetic resin molded body, there is a method of bonding a metal foil, a method of applying or transferring a metal paste, and a simple method of coating a metal net on the surface of the molded body. That is, there is a method of laminating and pressing a preformed metal net and a thermosetting resin (for example, FRP or the like).

[Problems to be solved by the invention]

However, the conventional method using a wire mesh has many problems of complicated pretreatment and other steps, resulting in low productivity and high cost, and also has a problem that the wire mesh is easily peeled or deformed.

It is an object of the present invention to provide a resin molded product coated with a wire mesh, which is much simpler and more economical than the above-mentioned conventional method, and to provide a product excellent in quality and characteristics as compared with the conventional method. It is.

[Means for solving the problem]

The present inventors have repeatedly studied an efficient method of coating a wire net in order to solve the above-mentioned problems, and as a result, the present inventors have developed the above-mentioned problems by applying the technique of injection molding using a cloth. And found that the present invention can be solved.

That is, the present invention provides a wire mesh-coated synthetic resin injection molded article characterized in that a metal net is integrally laminated on the surface of the molded article by injection molding using a cloth, and a method for producing the same. A metal net and a top coat layer, if necessary, and a cloth provided with an adhesive layer and a logo mark, as necessary, are placed over the engaging surface of the injection mold, and the mold is closed. After that, plasticized synthetic resin is injected from the metal net side, and then the cloth is peeled from the obtained molded body, and a top coat layer and an adhesive layer are provided on the peeled surface, or on the cloth, or An object of the present invention is to provide a production direction of a wire mesh-coated synthetic resin injection-molded article characterized by transferring a previously provided top coat layer, an adhesive layer and a logo mark if necessary. The invention also provides a use invention in which the obtained molded body is suitable for a reflector for a parabolic antenna.

 Hereinafter, the present invention will be described in detail.

The fabric used in the present invention may be appropriately selected from commercially available natural, regenerated, or synthetic fiber fabrics according to the purpose.Preferably, the type of resin used, particularly the resin temperature required for its injection, The choice is made in consideration of conditions such as resin pressure and mold temperature and economics.

Therefore, most commercially available fabrics are used for general-purpose resins, but natural fibers, recycled fibers, inorganic fibers, and aramid fibers are used for engineering plastics that require high temperatures, high pressures, and high mold temperatures for injection. It is preferable to use a fiber which is substantially non-thermoplastic such as acrylic fiber or a fiber having excellent heat resistance.

The metal net used in the present invention is gold, silver, copper, iron, zinc,
The mesh is made of a metal such as tin, aluminum, nickel or the like, or an alloy such as stainless steel or brass. The type of the mesh such as the mesh can be freely selected according to the purpose.

As the synthetic resin used in the present invention, any resin which has been conventionally used as a resin for injection molding can be used. That is, polypropylene, polyolefin resins such as polyethylene, vinyl chloride resins, PET resins, PC resins, polyamide resins, PS, ABS, polystyrene resins such as HIPS, polyphenylene ether resins, and other engineering resins can also be used. .

Next, a method for producing the metal net-coated synthetic resin injection molded article of the present invention will be described with reference to a parabolic antenna reflector.

First, an injection mold is prepared by stretching a cloth with a metal net over the engaging surface of the mold. A hot-melt resin is extruded from the extrusion nozzle into this mold to fill the mold cavity of the parabolic antenna reflector. Then, when cooled and solidified, a molded product in which the above-described metal net and cloth are simultaneously adhered and integrated on the surface is obtained.

When the top coat layer and / or the adhesive layer is applied to the cloth in advance, and the resin penetrates the mesh of the metal net and is fixed to the molded body, it can be used as it is as a parabolic antenna reflector.

As a more preferable method, the cloth is peeled off from the molded article in which the cloth and the metal net are adhered and integrated, and a top coat layer such as a urethane type or an acrylic type and an adhesive layer if necessary are formed on the peeled surface (metal net). There is a method of applying a layer such as this to make a parabolic antenna reflector. This method is advantageous when the adhesive strength of the cloth of the molded product obtained by injection molding is not sufficient, or when it is desired to apply a specific top coat layer or the like. For the application of the top coat layer and the like, a layer such as a top coat layer and, if necessary, an adhesive layer may be provided on the surface of the cloth which is in contact with the metal net, and a method of transferring the cloth when peeling the cloth may be used. . According to this method, the manufacturing process is simplified, which is industrially advantageous.

Further, the transfer can be simultaneously performed on a logo mark pattern (by applying or printing) provided on the surface of the cloth. The provision of the top coat layer has effects of preventing oxidation and corrosion of the metal net, improving weather resistance, and improving the appearance. Simultaneous application of the logo mark also omits the process, and has a large profit.

In addition, if a cloth is not used, the metal net often undulates or rises, and even if the fixation is successful, the surface is not smooth, and only a material that is unsuitable for use as a reflector for a parabolic antenna is used. I can't get it.

[Action]

Conventionally, it has been difficult to satisfactorily cover the surface of a molded body with a mold by injection molding, and most of the cases have caused deformation or lifting of the wire mesh. A molded article is obtained. This is because in the conventional method using only the wire mesh, air remaining in the mold due to various causes is gathered in the wire mesh by the resin flow,
Because it is compressed, the mesh is deformed or the net is raised.In contrast, in the present invention, the air is stored in the cloth, so that the integral coating of the wire mesh on the molded product is preferably performed. Inferred.

〔Example〕

 Examples of the present invention and comparative examples are shown below.

Example 1 50-mesh stainless steel mesh (Fukuda Metal Foil & Powder Co., Ltd.)
Co., Ltd.) is a nylon 66 plain woven cloth
45cm diameter offset
Cover the engaging surface of the mold of the reflector for
It was stretched. Closed engagement of this mold, Mitsubishi Heavy Industries, Ltd.
Set on a 650-ton injection molding machine made of stainless steel
Styrene-modified polyphenylene ether
Resin (Xylon manufactured by Asahi Kasei Corporation) ) Hot melt resin
Is injected into a mold and cooled according to the usual method.
A molded product having the structure of stainless steel net / molded body can be obtained.
Was. When the uppermost fabric is peeled from this molded product,
Of the surface state where the mesh is firmly fixed to the surface of the compact
A good stainless steel net-coated Zylon compact was obtained.

Next, a urethane two-component paint was applied to this surface to provide a top coat layer, and finishing was performed. This had excellent performance as a reflector for a parabolic antenna.

Example 2 A good reflector for a parabona antenna was manufactured in the same manner as in Example 1 except that the wire mesh was changed to a 50-mesh brass mesh (manufactured by Fukuda Metal Foil & Powder Co., Ltd.).

Example 3 The same procedure as in Example 1 was carried out except that a urethane two-liquid white paint was applied on the cloth used in Example 1 in advance, and a logo printed with a red paint was used as the cloth. A molded article was obtained in the same manner, and the cloth was peeled off. A reflector for a stainless steel net-coated parabolic antenna to which a logo mark and a urethane top coat layer were transferred was obtained.
In the present embodiment, the post-treatment process (application of the top coat layer and the like) of Example 1 could be omitted.

Example 4 The same procedure as in Example 3 was carried out except that the metal net was changed to the brass used in Example 2, and a good parabolic antenna reflecting mirror was obtained as in Example 3.

Example 5 50 mesh stainless steel mesh (Fukuda Metal Foil & Powder Co., Ltd.)
Crodeny of nylon 66 coated with an adhesive)
Straight woven fabric (manufactured by Nippon Gosen Co., Ltd.)
45cm diameter reflector for parabolic antenna
It was stretched over the engaging surface of the mold. Engage this mold closed
And set it on a 650-ton injection molding machine manufactured by Mitsubishi Heavy Industries, Ltd.
Later, the styrene-modified po
Riphenylene ether resin (Zyro manufactured by Asahi Kasei Corporation)
N Inject the hot-melt resin into the mold and cool according to the usual method
Then it has the structure of nylon cloth / stainless steel net / molded body
Molded product was obtained. Urethane is applied to the surface of the molded product with this cloth.
Applying a two-pack paint and finishing it
A reflector for a la antenna was manufactured.

Comparative Example 1 The same procedure as in Example 1 was repeated except that only a 50-mesh stainless steel net was stretched in a mold without using a cloth.
A molded article having a structure of a molded article was obtained. In this molded product, the stainless steel mesh covering the surface is partially deformed, the surface is partially raised, and the entire surface is poor in smoothness. Therefore, it is of little value as a parabolic antenna reflector. Was.

〔The invention's effect〕

The present invention has the effect of enabling simple and economical mass-provision of synthetic resin injection-molded articles excellent in surface condition and other properties in which a wire mesh is integrally coated, which could not be achieved by the conventional press molding method. Have. Thus, it can be said that the present invention greatly contributes to a large supply of reflectors for parabolic antennas, whose demand has been increasing rapidly in recent years.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 45/00-45/24

Claims (6)

(57) [Claims] 1. A metal net-coated synthetic resin injection-molded article characterized in that a metal net is integrally laminated on the surface of the molded article by injection molding using a cloth. 2. A cloth used is peeled off from the integrally formed metal net, and a top coat layer is provided on the peeled surface, or a top coat layer provided on the cloth, an adhesive layer provided as required, and a logo mark. The synthetic resin injection-molded article coated with a wire net according to claim 1, wherein is transferred. 3. A metal net-coated synthetic resin injection molded article according to claim 1, wherein the used cloth remains on the metal net as it is. 4. A metal net, a top coat layer if necessary, and a cloth provided with an adhesive layer and a logo mark as required are placed so as to cover the engaging surface of the injection molding die. After the closing engagement, the plasticized synthetic resin is injected from the metal net side, and then the cloth is peeled from the obtained molded body, and a top coat layer and an adhesive layer are provided on the peeled surface, or A method for producing a wire mesh-coated synthetic resin injection-molded article, comprising transferring a top coat layer, an adhesive layer and a logo mark, if necessary, provided on a cloth in advance. 5. A metal net, a top coat layer as necessary, and a cloth provided with an adhesive layer and a logo mark as necessary are superimposed on each other so as to cover the engagement surface of the injection mold. A method for producing a metal net-coated synthetic resin injection-molded article, comprising injecting plasticized synthetic resin from the metal net side after closing engagement, and then taking out a molded article obtained by integrating the cloth with the metal net. 6. A reflecting mirror for a parabolic antenna, comprising the metal net-coated synthetic resin injection-molded product according to claim 1.