JPH06125592A - Production for speaker net - Google Patents

Abstract

PURPOSE:To provide a production method capable of obtaining a speaker net with three-dimensional curved surface net by means of a laminated sheet binding a raschel net impregnating with a plastic sheet with many transparent cores or synthetic resin and cloth. CONSTITUTION:A laminated sheet 1 binding the raschel net impregnating with the plastic sheet with many transparent pores or synthetic resin and the cloth is used. The laminated sheet 1 is inserted and held between a male type 2 and a female type 3. The laminated sheet 1 is formed in the three-dimensional curved surface while being heated and pressed, and the heat treatment is performed at the higher molding temperature. Thus, the speaker net with uniform transparent cores and texture of the cloth and less susceptible to deformation after the long-time use can be effectively obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a speaker net used on the front surface of a speaker such as a television or a stereo.

[0002]

2. Description of the Related Art Conventionally, a speaker net used on the front surface of a speaker such as a television is formed by an iron plate having a large number of through holes formed by punching. When a fabric is attached to the surface to improve the appearance. There is. However, in the case of an iron plate, in the case of forming a curved speaker net, there is a problem that manufacturing is time-consuming because it is necessary to press the iron plate into a curved surface and then manually attach the fabric thereto.

On the other hand, recently, it has been studied to form a three-dimensional curved surface in accordance with a demand by using a laminated sheet composed of a plastic sheet having a large number of through holes and a woven fabric. Here, as a method of forming a breathable sheet such as a woven fabric or a plastic sheet provided with holes into a three-dimensional curved surface, a method of stacking these sheets with a non-breathable sheet and vacuum or pressure forming (JP-A-49-31
No. 759), or a method of sandwiching a preheated sheet between a male mold having a desired shape and a female mold and pressurizing the sheet to form the sheet.

However, when a three-dimensional curved speaker net is formed by using the above-mentioned laminated sheet made of a plastic sheet having a large number of through holes and a woven fabric, the obtained three-dimensional curved speaker net is There was a problem that it would be deformed by long-term use. Also, in any of the molding methods, there is a difference between the stretched part of the laminated sheet used and the part that does not stretch so much, the size of the through holes and the size of the fabric of the woven fabric are different, and there is a problem in appearance,
There were problems such as the difficulty of producing beautiful sounds.

[0005]

DISCLOSURE OF THE INVENTION The present invention has found a method for manufacturing a speaker net using a male type and a female type, which can solve the above problems, and the gist thereof is
A laminated sheet 1 in which a plastic sheet having a large number of through holes or a Russell net impregnated with a synthetic resin and a woven fabric are bonded and laminated is held between a male mold 2 and a female mold 3 and the laminated sheet 1 is heated. However, the present invention is directed to a method for manufacturing a speaker net, which is characterized in that after pressing and molding into a three-dimensional curved surface, heat treatment is performed at a molding temperature or higher.

The present invention will be described in detail below. In the present invention, a plastic sheet provided with a large number of through holes or a laminated sheet in which a Russell net impregnated with a synthetic resin and a fabric are adhesively laminated is used. As the plastic sheet, a hard or semi-rigid plastic sheet can be used. But,
From the viewpoint of strength, heat resistance, punching property, etc., a post-chlorinated polyvinyl chloride resin sheet can be preferably used. The chlorine content of the post-chlorinated polyvinyl chloride resin is preferably about 60 to 68%.

The post-chlorinated polyvinyl chloride resin sheet is
Even if fine through holes are provided by punching, the sheet is preferable because it does not melt due to frictional heat and has high heat resistance itself. In addition, a sheet made of polyester resin, polycarbonate resin or the like can be used. From the viewpoint of strength and rigidity, the thickness of the sheet is preferably about 0.2 to 1.0 mm. After punching a lot of fine through holes on the sheet,
Apply adhesive to the sheet.

[0008] Here, when the ambient temperature of the speaker net is high, for example, a car stereo is required to have heat resistance, and it is preferable to use a rigid cloth Russell net impregnated with a synthetic resin. Is preferably 10 to 40 mesh made of polyester fiber, and urethane resin, polyester resin or the like may be appropriately used as the synthetic resin to be impregnated.

The adhesive is applied to a plastic sheet or a Russell net having a large number of through holes and is bonded to a synthetic fiber woven fabric, so that the application area is small.
Since the coating amount is small enough not to block the through holes, it is necessary to obtain a sufficient adhesive strength. A two-component curable type such as an acrylic type, urethane type or polyester type is suitable. Can be used.

As a woven fabric to be attached to a plastic sheet or a Russell net, a fine mesh of 100 to 200 mesh made of polyester or polyamide cloth can be preferably used.

Next, the method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the sequence of the method of the present invention, (A) shows a state before molding, (B) shows a state at the time of molding, and FIG. 2 shows an example of a speaker net obtained by the present invention. FIG. 3 is a schematic front view showing the speaker net shown in FIG. 2, and FIG. 3 is a schematic sectional view taken along the line C-C of the speaker net shown in FIG. 2, and FIG. 4 is a perspective view showing another example of the speaker net obtained by the present invention. FIG. 5 is a schematic sectional view showing an example of an apparatus used in the method of the present invention.

In the present invention, first, the laminated sheet 1 is placed between the male mold 2 and the female mold 3. The method of the present invention has the advantage that a plurality of laminated sheets 1 can be used as shown in FIG. 1A and the production efficiency can be increased. The number of sheets can be several to several thousand. Further, if the laminated sheet 1 placed between the male die 2 and the female die 3 is heated by a heater or the like before being placed, the production efficiency can be further improved. The area of the laminated sheet 1 to be placed is
It must be larger than the projected area of the speaker net after molding. Here, it is necessary to make the unnecessary portion of the outer periphery of the speaker net cut out after molding as small as possible, and the area of the laminated sheet 1 may be appropriately determined in consideration of these points.

The male mold 2 and the female mold 3 are usually made of a metal material such as aluminum or iron or a rigid resin material such as phenol resin or nylon resin according to the shape of the molded product, and heating means such as a heater. It is also possible to use the one provided inside. As a heating means other than the above, a method of installing the entire apparatus including the male mold 2 and the female mold 3 inside a heat retaining device capable of heating and controlling the ambient temperature is preferable from the viewpoint of efficiency.

Next, while heating the laminated sheet 1, as shown in FIG.
As shown in B of No. 3, the male mold 2 and the female mold 3 are clamped and pressed to form a three-dimensional curved surface. The device composed of the male mold 2 and the female mold 3 used here differs depending on the shape of the speaker net and the like, but the device shown in FIG. 5 can be preferably used.
In the apparatus shown in FIG. 5, the end portion of the laminated sheet 1 is fixed by the bolts 4 so that the end portion does not move, and the male mold 2 is moved only at the pushed-in portion, so that wrinkling at the time of molding can be prevented.

In the method of the present invention, the laminated sheet 1 is pressed in a heated state and molded into a three-dimensional curved surface,
Compared with the conventional method, the laminated sheet is more easily stretched, so that it is easier to follow the shape of the molding die, and it is easy to obtain a molded product having a uniform hole shape and the like. The heating temperature varies depending on the resin used for the plastic sheet or the Russell net, but is usually a temperature near the glass transition point of the resin or the softening temperature.

After being heat-molded at the above-mentioned molding temperature, the laminated sheet needs to be heat-treated at a temperature higher than this molding temperature. The heat-treatment temperature varies depending on the resin used for the plastic sheet or the Russell net as in the above, but usually the resin is used. The glass transition point, or the temperature range from the softening temperature or higher to the melting point (decomposition start temperature in the case of a resin having no melting point).
The heat treatment time may be appropriately determined in consideration of the heating temperature and the number of laminated sheets, and usually about 3 minutes to 2 hours is preferable. Regarding the heat treatment method, the heat treatment may be carried out in the mold as it is, or may be carried out in a heat treatment apparatus other than the mold.

Next, the heat-treated laminated sheet is gradually cooled at room temperature, and then unnecessary portions on the outer periphery of the laminated sheet are cut off to form a final speaker net 4 as shown in FIG.

[0018]

【Example】

Example 1 A 1 mm diameter through hole was provided on the entire surface of the sheet with a porosity of 58% and a pitch of 1.25 mm, and then a chlorinated polyvinyl chloride resin sheet (thickness 0.3 mm, flexible temperature 85 ° C.) with nylon cloth (elongation rate). 3% adhesively laminated sheet (size: 100
mm × 700 mm), the speaker net 4 having the shape shown in FIGS. 2 and 3 was manufactured by the method shown in FIG.

First, the above laminated sheet is preheated to 80 ° C., and as shown in FIG.
The laminated sheets were placed and clamped at a mold temperature of 90 ° C.
The mold clamping force was 1 kg / cm ² . Then, it was heat-treated at 90 ° C. for 1 hour as it was.

After the 10 heat-treated laminated sheets were gradually cooled to room temperature, unnecessary portions on the outer periphery of the laminated sheets were cut off to obtain a final speaker net. There was no deformation even when the obtained speaker net was heated at 80 ° C. for 100 hours.

Example 2 As a laminated sheet, a polyester type Russell net (impregnated with a urethane type resin, 26 mesh) and a polyester type gauze (150 mesh) bonded and laminated was used.
In-vehicle stereo speaker net (diameter is 12
A 0 mm hemispherical speaker) was manufactured.

First, the above-mentioned laminated sheet is heated to 150 ° C. in advance, five laminated sheets are placed between the male mold 2 and the female mold 3, and the mold is clamped at a mold temperature of 160 ° C. (mold clamping force: 1 kg / c
m ² ). Then, heat treatment was performed at 160 ° C. for 10 minutes as it was. After the five heat-treated laminated sheets were gradually cooled to room temperature, unnecessary portions on the outer periphery of the laminated sheets were cut off to obtain a final speaker net. There was no deformation even when the obtained speaker net was heated at 105 ° C. for 3 hours.

[0023]

As described above, according to the present invention, it is possible to efficiently obtain a speaker net having a three-dimensional curved surface in which the size of the through holes and the size of the texture of the woven fabric are uniform, and the obtained speaker net is obtained. It has the advantage of being difficult to deform.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of the sequence of the method of the present invention.

FIG. 2 is a schematic front view showing an example of a speaker net obtained by the present invention.

3 is a schematic cross-sectional view taken along the line CC of the speaker net shown in FIG.

FIG. 4 is a perspective view showing another example of the speaker net obtained by the present invention.

FIG. 5 is a schematic sectional view showing an example of an apparatus used in the present invention.

Claims (3)

[Claims] 1. A laminated sheet (1) in which a plastic sheet having a large number of through holes and a woven fabric are adhesively laminated, and the laminated sheet is held by a male mold (2) and a female mold (3), and laminated. A method for manufacturing a speaker net, which comprises pressing (1) while heating it to form a three-dimensional curved surface, and then performing heat treatment at a forming temperature or higher. 2. The method for producing a speaker net according to claim 1, wherein a laminated sheet (1) obtained by adhesively laminating a synthetic resin-impregnated Russell net and a woven fabric is used. 3. The method for manufacturing a speaker net according to claim 1, wherein a plurality of laminated sheets (1) are used.