JPS5812136B2 - Amiili plastic plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wired plastic plate used for example in display products, and in particular, a wired plastic plate is obtained only by heating and pressurizing a transparent or translucent thermoplastic synthetic resin plate. It is related to the method.

Conventionally, when inserting a net, such as a wire mesh, between two plastic plates, the net to be inserted between two synthetic resin plates is sandwiched in advance, almost in the same way as in the manufacturing method of wired glass.
It was thought that the only effective method was to heat-weld these in a mold or to bond the three components together using another adhesive.

However, the plastic plates obtained by these methods all suffer from foaming or devitrification, and furthermore, the manufacturing process is complicated, making them impractical. Plastic plates have not yet been commercialized in general.

That is, for example, when a wire mesh is sandwiched between two transparent acrylic resin plates and the two plates are integrated by heating and melting in a mold, a bubble phenomenon appears, and the wire mesh inserted as an intermediate is It was not possible to apply patterns, designs, etc. and transmit the material to the outside for use as various display items.

Furthermore, even if you try to use adhesive to integrate two acrylic resin plates with a wire mesh interposed between them, solvent-based adhesives will cause devitrification due to the residual solvent after adhesion, and cracks may occur in some cases. .

Furthermore, if there is poor adhesion, moisture may enter the bonded surface, or the wire mesh may come into contact with the wire mesh, and the wire mesh may return.

This invention was made in consideration of the above-mentioned circumstances, and when manufacturing a mesh plastic plate, a transparent or translucent thermoplastic synthetic resin plate is superimposed on one side of the mesh plate in a mold, and then Thereafter, this synthetic resin plate is heated and pressurized to penetrate the mesh of the mesh plate body to form an insulating coating made of the synthetic resin on the opposite surface, and in the above method, the internal bottom surface has a slightly convex curved surface. It is characterized by using a mold.

The present invention will be explained below based on one embodiment.

In Fig. 1, 1 is a mold, which is composed of a lower mold 2, a middle mold 3, and an upper mold 4. A heating plate 5 with a built-in jacket is integrated on top of the upper mold 4, and This is connected to a pressurizing mechanism (not shown).

A metal mesh 6 with or without a pattern such as punching is inserted in advance into the mold 1, and a transparent resin plate, for example, an acrylic resin plate 7 is placed on top of the metal mesh 6.

Once the wire mesh and the resin plate are installed in the mold 1 as described above, the pressurizing mechanism (not shown) is activated while heating them to lower the upper mold 4 and heat and pressurize the resin plate.

As a result, the resin plate γ softens and becomes fluid, which penetrates each mesh of the wire mesh 6 and flows out to the opposite surface while surrounding the wire mesh strands, where they are integrated with each other and form a thin film on this surface. Upon completion of the formation, a wired plastic plate is formed all at once.

Thereafter, this is naturally cooled or forcedly cooled and then taken out from the mold 1 to obtain a wired plastic plate 8 as shown in FIG.

As the resin used here, all transparent or translucent synthetic resins are used, and in addition to the above acrylic resin, styrene resin, acrylonitrile-styrene copolymer resin (
As resin), acrylonitrile-butadiene-styrene copolymer resin (ABS resin), etc. are used.

Further, as the wire mesh, any size mesh can be used, such as one with a fine mesh of 50 to 100 meshes.
Any mesh plate body including an outer mesh plate of punched metal or the like can be used.

In addition, the temperature and pressure applied in carrying out this invention cannot be constant depending on the type and thickness of the resin used, the mesh of the wire gauze, etc., but if the temperature is too high, the fluidity of the resin will improve, but the resin itself There is a risk that bubbles may occur after cooling and mold removal due to the small amount of monomers and other low-boiling substances that are thought to be generated at that time.

Furthermore, if the temperature is too low, the resin will be insufficiently fluidized and will have difficulty penetrating the mesh.

An example is As resin, thickness 3.5 mm, wire mesh 60, temperature 120-130, pressure 40-60 kg/c.
m is preferred.

Further, the sizes of the net plate body and the synthetic resin plate may be the same or different sizes.

Furthermore, the above-mentioned treatment can be carried out by using a long net plate body and sandwiching the parts between the lower mold and the middle mold shown in FIG.

According to the present invention, wired plastic can be obtained all at once, but this product normally becomes convex with respect to the mesh board surface due to thermal distortion and normally requires an annealing treatment afterwards. By using a mold having a slightly convexly curved bottom surface as in the second invention, a flat plate can be obtained at once without going through this annealing process, thereby greatly saving man-hours.

In this invention, since the net plate body is included on one side, the bending property is normally constant, so by using a mold that takes this into account in advance, it can be made all at once without going through the annealing process as described above. This made it possible to make it into a flat plate.

As explained above, according to the present invention, a mesh plastic with excellent strength can be easily obtained by using a simple mold, and by applying arbitrary designs and patterns to the mesh board used here. Combined with the properties of transparent resin, a wide variety of products can be obtained.

These are used for various display items, light covers, decorative windows, plastic substitutes for glass, decorative items, hand mirror backs, and other items for women's belongings, and are used for indoor and outdoor decorative purposes, as well as general industrial materials. .

For example, conventionally, when a receiver is operated, it is usually done inside a shielded room covered with wire mesh or metal plates to block radio wave interference from the outside, but in such cases, especially when the receiver is small, By covering and shielding using the plastic plate with wire mesh according to the present invention, it is possible to observe the inside while avoiding radio interference from the receiver and other external sources.

Example: A wire mesh of 150 x 20 mm was placed in advance on the lower mold of the mold shown in
Place a 0mm, 60 mesh and place a medium size on top of it,
Inside this medium size is the same size as the medium size 110mm x 150m.
An As resin of m×3.5 mm was placed, and while being heated by a jacket of a heating plate, it was pressurized with an upper mold.

The heating and pressurizing conditions were 125°C, 15 minutes, and 50 kg/cm'.

When the mold was removed by draining the water and cooled to room temperature, a meshed plastic plate was obtained in which a wire mesh was tightly adhered to one side of the plastic plate and a beautiful ultra-thin coating was formed on the surface.

When this was precisely observed with the naked eye, no bubbles were observed.

In addition, by performing exactly the same operation as this, the same shape as above,
When 20 wired plastic plates of the same size were made, all the plates had exactly the same shape and bending state.

Therefore, the inner bottom surface of the mold was made into a convex shape according to the above-mentioned target condition, and when the same process as above was carried out using this, a flat meshed plastic plate was obtained in one step.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of an apparatus for carrying out the present invention, and FIG. 2 is a side view of a plastic plate containing a mesh plate obtained by the present invention. 1... Entire mold, 2... Lower mold, 3... Middle mold, 4.
・・Upper mold, 6・Wire mesh, 7・Resin plate, 8・
...Netted plastic plate.

Claims (1)

[Claims] 1. A transparent or translucent thermoplastic synthetic resin plate is superimposed on one side of the net plate body in a mold, and then this synthetic resin plate is heated and pressurized to penetrate the mesh of the net plate body. A method for manufacturing a wired plastic plate, characterized in that an insulating film made of the resin described above is formed on the opposing surface of the wired plastic plate. 2. A method for manufacturing a replastic plate containing a mesh board according to claim 1, characterized in that a mold having an internal bottom surface having a slightly convex curved surface is used.