JPH0361021A - Manufacture of multi-layer structural body - Google Patents

Abstract

PURPOSE:To contrive strong joining and unification of the surface of a plastic principal layer and a metallic net, by a method wherein the metallic net is fused unitarily to the surface of parison by sinking into the surface while generating extension of the metallic net later than the extension by expansion of the parison at the time of blow molding. CONSTITUTION:Although a metallic net 9 is set up to a cavity of one side of molds 1, 2, a space 11 is provided between the whole fringe of the cavity 3 and a recessed part 10 forming protrusions 5 each forming a rib at that time. The spaces 11 each are provided for extension of the metallic net 9 toward the cavity 3. In addition, the metalic net 9 to be set up is formed beforehand so that the same runs almost along a form of the cavity 3. Upon completion of setting of the metallic net 9 as mentioned above, a pair of molds are clamped down by arranging plasticized plastic parison 12 from an extrusion head 8 between the pair of molds 1, 2 an blow molding is performed by blowing a pressurized fluid into the parison 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to panels, etc. that constitute the housing of electronic equipment,
The present invention relates to a method for manufacturing a multilayer structure having a metal mesh layer on the surface of a plastic main layer.

[Prior art] In the housing of electronic equipment, etc., electromagnetic waves are shielded,
Alternatively, the plastic panels that make up the housing may have a thin layer of metal to shield them from magnetic fields.

Conventionally, metal plating methods, metal coating methods, and integral insert methods have been known as means for forming a thin metal layer on a plastic main layer. Are listed.

[Problems to be Solved by the Invention] According to the integral insert method described in the above-mentioned Japanese Unexamined Patent Publication No. 59-93349, a three-dimensionally formed metal sheet is set in the cavity of a mold, and then plasticized. A mold made of plastic parison is placed, the mold is closed, and blow molding is performed. This method allows a metal sheet layer to be formed relatively easily on the surface of the plastic main layer, and even if the shape is complex, it can be easily formed. can be formed.

However, since the metal sheet cut into the plastic main layer is only fused by the expansion pressure of the burr ridge during blow molding, the adhesion of the metal sheet layer to the plastic main layer is poor, and due to deformation of the plastic main layer, etc. The problem is that the metal sheet is easily peeled off.

The present invention is an attempt to solve the above-mentioned drawbacks of the conventional products.The present invention aims to solve the above-mentioned drawbacks of the conventional products.
By inserting a metal mesh into the surface of the burr and fusing it together, a strong bond is created between the surface of the plastic main layer and the metal mesh, which prevents deformation of the plastic main layer. It is an object of the present invention to provide a method for manufacturing a multilayer structure that can maintain a stable and good state for a long period of time without causing the metal mesh to peel off even when the metal mesh is used.

[Means for Solving the Problems] In order to achieve the above object, the present invention proposes the following manufacturing method as a technical means thereof.

That is, the method for manufacturing a multilayer structure according to the present invention involves placing a metal mesh and a plasticized plastic burr ridge between a pair of molds, then closing the molds and blowing pressurized fluid into the burr ridge. This is a method for manufacturing a multilayer structure in which a metal mesh layer is formed on the surface by expanding a burr ridge with a burr. A space is created between the panosun and the mesh, and the metal mesh is inserted into the surface of the panosun and fused together while allowing the metal mesh to elongate later than the elongation due to the expansion of the burr ridge during blow molding. It is characterized by this.

[Function] In the method for manufacturing a multi-IrJ structure according to the present invention, 1;
When setting the metal mesh in the mold cavity,
A space is provided between the mold cavity and the metal mesh. On the other hand, the burr ridge placed between the molds expands during the blow molding process and reaches the metal mesh before coming into contact with the mold cavity.Furthermore, the burr ridge expands toward the mold cavity. However, in this process, the metal mesh stretches later than the burr ridge, so the metal mesh is sunk into the burr ridge and fused together.

[Example] An example of the method for manufacturing a multilayer structure according to the present invention will be described with reference to the drawings.

In FIG. 1, 1.2 is a pair of molds, 3 and 4 are cavities thereof, and the cavity 3 of one of the molds 1 is formed with a convex portion 5 forming a large number of ribs. 6,
7 is a pinch-off part, and 8 is an extrusion head.

When blow molding a multilayer structure, a metal mesh 9 is set in one of the cavities 3 of the pair of molds 1.2. A space 1 is formed between the recessed part 10 forming the part 5.
1 will be provided. Each space 11 is for allowing the metal mesh 9 to extend toward the cavity 3. Note that the metal mesh 9 to be set is formed in advance so as to substantially follow the shape of the cavity 3. Once the metal mesh 9 has been set as described above, the plasticized plastic burr ridge 12 is inserted into the pair of molds 1 from the extrusion head 8.
, 2, the molds 1 and 2 are closed, and pressurized fluid is blown into the burr cage 12 to perform blow molding.

In the process of blow molding, on the side of the cavity 3 where the metal mesh 9 is set, the burr ridge 12 expands and comes in contact with the metal mesh 9, as shown in FIGS. 2 to 4.
The burr ridge 12, which expands further, extends into the space II as if sinking into the metal mesh 9, and the metal mesh 9 is accordingly extended toward the cavity 3 toward the space 11. Barisuji 1 with net 9 coated
2 is molded into a shape that follows the cavity 3 (Figure 4)
. In the blow molding process that proceeds in the manner described above, the metal mesh 9 stretches later than the parison 12, so that the metal mesh 9 sinks into the parison 12 reliably. Particularly in the part where the blowing ratio of the ballison 12 is high, which corresponds to the withdrawal part, the recess is deep, so the adhesion of the metal mesh 9 in the formed multilayer structure is strong, and the metal mesh 9 may peel off due to deformation, etc. This prevents the metal mesh 9 from being scraped off at the ridgeline portions, which tends to occur when using the nagato mat. In addition, in order to have high electromagnetic wave shielding properties and to improve the penetration of the balisong, the net should be set at 5~i.
ooo mesh, preferably 10-40 mesh, wire diameter 0.05-2 mms, preferably 0.1-l
Set to mll+.

5 and 6 show a housing panel 13, which is a multilayer structure manufactured by the method according to the invention. In this hinged panel 13, the metal mesh 9 integrally inserted into the plastic main layer 14 is molded so that its end is accommodated in the groove 15, so after molding, a cutter 16 is used to cut the excess metal mesh 9 along the groove 15. Part 9a
(Figure 5).

17 is a parting line formed by welding the parison sandwiched between the pinch-off parts 6°7 located on the circumferential surfaces of the molds 1 and 2, and removing the parison protruding from the outside of the molds 1 and 2. (Figure 6). Note that this housing panel 13 is used as a front panel 19 of an electronic device (electronic copy machine) 18, as shown in FIG. The layer of metal mesh 9 is for electromagnetic shielding, magnetic shielding, or both.

8 and 9 show the other side of the embodiment described above. In this embodiment, a metal net 9 whose terminals have been treated in advance is integrally inserted, and 20 is a metal mesh. This is the terminated edge of the net 9. The edge 2o of the metal mesh 9 is inserted into one piece during blow molding and is fixedly fitted.

Note that the other configurations are the same as those of the previous embodiment.

[Effects of the Invention] The present invention involves arranging a metal mesh and a plasticized plastic ballison between a pair of molds, then closing the mold and blowing pressurized fluid into the ballison to inflate the ballison. A method for manufacturing a multilayer structure with a layer of metal mesh formed on the surface, in which when setting the metal mesh in the cavity of the mold, there is a gap between the cavity of the mold and the metal mesh. By creating a space, the metal mesh stretches at a slower rate than the expansion of the ballisne during blow molding.
Since this is a multi-layer manufacturing method in which a metal mesh is embedded into the surface of the ballison and fused together, it is possible to achieve a strong bond and integration between the surface of the plastic main layer and the metal mesh, and the plastic It is possible to easily obtain a multilayer structure in which the metal mesh does not peel off even if the main layer is deformed, and can maintain a stable and good state for a long period of time.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 4 show a method for manufacturing a multilayer structure according to the present invention, FIG. Figures 5 and 4 are partial sectional views sequentially showing the blow molding process, Figures 5 and 6 are partial cross-sectional views of the manufactured multilayer structure housing panel, and Figure 5 is a partial perspective view. , Figure 6 is a perspective view of the whole, Figure 7 is a perspective view of the whole.
The figure is a perspective view of the entire electronic copying machine using the housing panel, FIG. 8 is a sectional view showing another embodiment of blow molding, and FIG. 9 is a perspective view of a part of the manufactured housing panel. It is a diagram. 1.2... Pair of molds, 3, 4... Cavity, 5
...Convex portion, 8...Extrusion head, 9...Metal mesh,
10... recess, 11... space, 12... parison

Claims (1)

[Claims] A layer of metal mesh on the surface by placing a metal mesh and a plasticized plastic parison between a pair of molds, then closing the molds and inflating the parison by blowing pressurized fluid into the parison. A method of manufacturing a multilayer structure in which a metal mesh is set in a mold cavity, and a space is provided between the mold cavity and the metal mesh to prevent the parison from expanding during blow molding. 1. A method for manufacturing a multilayer structure, characterized in that a metal mesh is inserted into the surface of a parison and fused together while causing elongation of the metal mesh to lag behind the elongation of the metal mesh.