JPH11292050A - Formed article of resin, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin formed article, and its manufacturing method in which an insert can be easily manufactured, and the adhesivity of the insert to an injection resin can be improved. SOLUTION: A soft mesh-like electromagnetic wave shielding fiber 11 is arranged in a forming die, and the forming die is seamed. The soft electromagnetic wave shielding fiber 11 is deformed following the shape of the inside of the forming die 1. An insert need not be manufactured to the shape of the forming die 1. Because the injection resin enters the surface of the mesh-like electromagnetic wave shielding fiber 11, the adhesivity of the electromagnetic wave shielding fiber 11 to the injection resin is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product and a method for producing the same, and more particularly to a resin molded product having an insert therein and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there has been known a resin molded product having an insert therein. Further, such a resin molded product is obtained by placing an insert corresponding to the shape of the molded product in a molding die in advance, and then injecting an injection resin into the molding die.

[0003]

As described above, when manufacturing a resin molded article having an insert, it is necessary to arrange an insert corresponding to the shape of the molded article in a molding die in advance. However, in this case, the insert must be arranged at a predetermined position in the molding die, and the degree of freedom of the molding operation is limited.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to provide a resin molded product capable of greatly improving the degree of freedom of a molding operation, and a method of manufacturing the same.

[0005]

The present invention provides an injection resin,
In the method of manufacturing a resin molded product, comprising the soft mesh material provided in the injection resin, and the resin molded product described above, the mesh material is disposed in a molding die. A molding step, a step of clamping the molding die, and a step of injecting the injection resin into the molding die.

[0006] According to the present invention, the soft mesh-like material placed in the molding die beforehand is used for clamping the molding die.
Deforms following the shape in the molding die. In addition, since the mesh-like object has moderate irregularities on its surface, the adhesion between the injection resin and the mesh-like object is improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing a resin molded product according to the present invention and a method for producing the same.
As shown in FIG. 1, a resin molded product 10 is an injection resin 12.
And a soft electromagnetic shielding fiber (mesh-like material) 11 disposed on one side of the injection resin 12.
Among them, the electromagnetic wave shielding fibers 11 are used to shield electromagnetic waves as inserts.
As shown in (a) and (b), it is made of a mesh-like porous fiber composed of a large number of linear bodies 15.

Each linear member 15 is composed of a core material 15a made of a synthetic resin, for example, polyester, and a metal layer 15b covering the outer surface of the core material 15a. The metal layer 15b is made of copper or nickel made of the core material 15a. It is formed by electroless plating on the outer surface. The linear body 15 may be composed of a glass core 15a and a metal layer 15b covering the outer surface of the glass core 15a, or the linear body 15 may be composed of only the metal core. good.

A general-purpose thermosetting resin can be used as the injection resin 12. For example, PC, HIPS,
PS, PP, PE, ABS, PVC, nylon and the like can be used.

Further, using an injection resin 12 having transparency,
In addition, since the electromagnetic wave shielding fiber 11 has a desired light transmittance, it is possible to obtain a resin molded product 10 having excellent electromagnetic wave shielding characteristics and transparency as a whole.

Next, a method for manufacturing a resin molded product having the above-described structure will be described. First, as shown in FIG. 2, a molding die 1 having a fixed die 2 provided with a gate 2a and a movable die 3 is prepared. Next, in a state where the fixed mold 2 and the movable mold 3 are opened, the electromagnetic wave shielding fiber 11 is unwound from the unwinding roll 5, and the space between the fixed mold 2 and the movable mold 3 (forming mold). 1 cavity 7).

At this time, the electromagnetic wave shielding fibers 11 arranged in the cavity 7 of the molding die 1 are held between the unwinding roll 5 and the winding roll 6 without tension.

Next, as shown in FIG. 3, the movable mold 3 approaches the fixed mold 2, and the fixed mold 2 and the movable mold 3 are closed (clamped).

At this time, since the electromagnetic wave shielding fibers 11 arranged in the cavity 7 of the molding die 1 are soft and are not tensioned, the electromagnetic wave shielding fibers 11 are fixed in the cavity 7 by the fixed metal. It deforms following the shape of the cavity 7 between the mold 2 and the movable mold 3.
In this manner, the electromagnetic wave shielding fiber 11 deformed into a desired shape can be arranged at a predetermined position in the cavity 7.

When the fixed mold 2 and the movable mold 3 are clamped, the electromagnetic wave shielding fiber 11 is sandwiched between the fixed mold 2 and the movable mold 3 above and below the cavity 7.

Next, the injection resin 12 is injected into the cavity 7 from the gate 2a of the fixed mold 2, and is pushed by the injection resin to press the electromagnetic wave shielding fiber 11 against the movable mold 3.

In this case, since the electromagnetic wave shielding fiber 11 has porosity, the surface thereof has moderate irregularities.
Therefore, when the injection resin 12 enters the concave and convex portions of the electromagnetic wave shielding fiber 11, the electromagnetic wave shielding fiber 11
And the injection resin 12 can be improved in adhesion.
Since the electromagnetic wave shielding fiber 11 is a mesh-like porous fiber, the injection resin 1
A part of 2 flows through the hole of the electromagnetic wave shielding fiber 11 to the movable mold 3 side. For this reason, compared with the case where a film through which resin does not penetrate is arranged in the cavity 7 of the molding die 1, the injection resin can be sufficiently spread in the cavity 7 even if the cavity 7 has a complicated shape. In addition, the degree of freedom of the shape of the resin molded product can be increased.

In this manner, the cavity 7 of the molding die 1
The resin molded product 10 is obtained within. Thereafter, the electromagnetic wave shielding fiber 11 is broken by a cutter (not shown) by the shape of the resin molded product 10, and the electromagnetic wave shielding fiber 11 is further wound up by a winding roll b.

As described above, according to the present embodiment, it is possible to easily and easily manufacture the resin molded product 10 having the electromagnetic wave shielding characteristics.

In the above-described embodiment, an example in which the electromagnetic wave shielding fiber 11 is used as the mesh-like material of the resin molded product 10 has been described. However, the present invention is not limited to this. Alternatively, a synthetic resin film having a large number of holes may be used.

Also, an example has been described in which the electromagnetic wave shielding fiber 11 is broken after the resin molded article 10 has been manufactured. However, the fixed mold 2 and the movable mold 3 are provided with a cutter, and the fixed mold 2 and the movable mold 3 are provided. The electromagnetic shielding fiber 11 may be broken in advance at the time of the mold clamping.

[0022]

EXAMPLES Next, specific examples of the present invention will be described. In this embodiment, a case (resin molded article 10) is manufactured by using an electromagnetic wave shielding fiber 11.

Such an electromagnetic wave shielding fiber 11 can be manufactured from a linear body 15 in which a metal layer 15b is formed by electroless plating nickel and copper on a polyester core material 15a.

Next, the electromagnetic wave shielding fiber 11 is molded
The injection resin 1 is placed in the cavity 7 of the molding die 1.
2 was injected to obtain a resin molded product 10.

The specific manufacturing conditions are as follows.
The molding die 1 used corresponds to a 100 × 100 × 15 box-shaped resin molded product 10.

The molding machine used was J350 manufactured by Japan Steel Works.
EPU (350 tons of mold clamp), the electromagnetic wave shielding fiber 11 cut into 150 × 300 was fixed to the upper part of the movable mold 3, and the lower part of the electromagnetic wave shielding fiber 11 was set in a free state.

The following three types of injection resins were used. Polycarbonate (PC) High impact polystyrene (HIPS) Heat-resistant polypropylene (Heat-resistant PP)

Next, the properties of the resin molded product 10 will be described. The molding condition of the resin molded product 10 was exactly the same as that of a normal resin molded product without any adverse effect due to the electromagnetic wave shielding fiber 11. Further, the electromagnetic wave shielding fiber 11 and the injection resin 1
The adhesion state of No. 2 was such that when viewed with a microscope, the injection resin 12 entered between the electromagnetic wave shielding fibers 11 and bitten into each other, so that the two completely adhered.

The flat electromagnetic wave shielding fiber 11 had good followability with respect to the molded product 10 having a depth of 10 mm, and showed almost 100% followability without any obstacles around. Even when the injection pressure and temperature of the resin were changed, no breakage of the electromagnetic wave shielding fiber 11 was observed.

[0030]

As described above, according to the present invention, when the mold is clamped, the soft mesh-like material can be deformed following the shape in the mold. Therefore, it is not necessary to prepare an insert having a shape corresponding to the shape in the molding die in advance. In addition, since the adhesion between the injection resin and the mesh can be improved, it is not necessary to provide another adhesive or the like between the injection resin and the mesh.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a resin molded product according to the present invention.

FIG. 2 is a schematic diagram showing a state in which a molding die is opened in the method for producing a resin molded product according to the present invention.

FIG. 3 is a schematic diagram showing a state in which a molding die is closed in the method for producing a resin molded product according to the present invention.

FIG. 4 is a diagram showing an electromagnetic wave shielding fiber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding die 2 Fixed die 3 Movable die 7 Cavity 10 Resin molding 11 Electromagnetic shielding fiber 12 Injection resin

Claims (11)

[Claims] 1. A resin molded article comprising: an injection resin; and a soft mesh-like material provided on the injection resin. 2. The resin-made molded product according to claim 1, wherein the mesh-like material is made of electromagnetic wave shielding fibers. 3. The molded article made of resin according to claim 2, wherein the electromagnetic wave shielding fiber has a large number of linear bodies composed of a core material and a metal layer covering an outer surface of the core material. 4. The resin molded article according to claim 3, wherein the core material is made of a synthetic resin. 5. The resin molded product according to claim 3, wherein the core material is made of glass. 6. The resin molded article according to claim 2, wherein the electromagnetic wave shielding fiber has a large number of linear bodies made of a metal core material. 7. The resin molded article according to claim 2, wherein the injection resin has transparency, and the electromagnetic wave shielding fiber has a desired light transmittance, thereby having transparency as a whole. 8. The resin-made molded article according to claim 1, wherein the mesh-like material is made of a synthetic resin non-woven fabric. 9. The resin molded article according to claim 1, wherein the mesh-like object is made of a synthetic resin film having a large number of holes. 10. The method of manufacturing a resin molded article according to claim 1, wherein a step of arranging a mesh-like object in an open molding die; a step of clamping the molding die; And a step of injecting an injection resin into the molded article. 11. When the mold is clamped, the mesh is held in the mold without applying tension, and the mesh is deformed to follow the shape in the mold. The method for producing a resin molded product according to claim 10, characterized in that: