JPH06246796A - Production of filter - Google Patents

Abstract

PURPOSE:To enhance the yield of a product by preventing the generation of an inferior product having a defect in the meshes of filter. CONSTITUTION:A mold having cavities 1 for forming weft yarns of meshes, cavities 2 for forming the warp yarns of the meshes and a frame forming cavity 3 and having a protruding weir part 4 provided in the frame forming cavity 3 thereof is constituted and all of the cavities 1, 2, 3 are filled with a molten resin to solidify the resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a filter to be attached to an air conditioner such as an air conditioner or a ventilation port of an electric or electronic device such as a computer.

[0002]

2. Description of the Related Art A conventional plastic filter is generally molded by using a mold provided with a weft forming cavity of a mesh, a warp forming cavity of a mesh, and a frame forming cavity. Often. When the mold is filled with the molten resin from the gate, the frame forming cavity has a wider width and a smaller resistance than the weft forming cavity or the warp forming cavity. It tends to flow toward the frame forming cavity rather than the cavity or warp forming cavity, so
There has been a problem that the entire weft forming cavity and the warp forming cavity are not sufficiently filled with the resin, and a defective product having a missing portion in a part of the mesh occurs.

[0003]

SUMMARY OF THE INVENTION The present invention prevents the generation of defective products in which the entire weft forming cavity and warp forming cavity are sufficiently filled with resin and a missing portion is present in a part of the mesh. An object of the present invention is to provide a filter manufacturing method capable of increasing the yield.

[0004]

In order to achieve the above object, a method of manufacturing a filter according to the present invention comprises a weft forming cavity 1 of a mesh and a warp forming cavity 2 of a mesh.
And a frame forming cavity 3, and a mold having the convex dam portion 4 inside the frame forming cavity 3 is configured.
The weft forming cavity 1, the warp forming cavity 2, and the frame forming cavity 3 of the mold are filled with a molten resin and solidified.

[0005]

When the molten resin flows into the frame forming cavity 3 through the weft forming cavity 1 or the warp forming cavity 2, the frame forming cavity 3 has a narrow portion due to the convex dam portion 4. By doing so, the resistance increases, so that the resin cannot flow smoothly as it is, and a part of the resin is left in the weft forming cavity 1 and the warp forming cavity 2.
As a result, all the weft yarn forming cavities 1 and the warp yarn forming cavities 2 are sufficiently filled with the resin.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, FIGS. 1 and 2 show a part of a mold. This mold is composed of two mold plates 5 and 6. On one of the template plates 5, a large number of warp forming cavities 2 are provided in parallel on the mating surface at equal intervals, and one half of the frame forming cavity 3 communicating with both ends of the warp forming cavities 2 is formed. It is provided. Further, the other template 6 is provided with a large number of weft thread forming cavities 1 in parallel on its mating surface at equal intervals, and one half of the frame forming cavity 3 communicating with both ends of the weft thread forming cavities 1. And further the frame forming cavity 3
A convex dam portion 4 having a height slightly lower than the entire depth of the frame forming cavity 3 is provided in the vicinity of the inner wall of the inside. When these template plates 5 and 6 are closed to each other, the weft forming cavity 1 and the warp forming cavity 2 are brought into a state in which their intersections communicate with each other on the mating surface. The gate is provided at an appropriate intersection between the weft forming cavity 1 and the warp forming cavity 2 (see FIG. 4).

Next, FIGS. 3 to 5 show a filter 7 molded by the above-mentioned mold. A weft yarn 8 is formed by the weft yarn forming cavity 1, a warp yarn 9 is formed by the warp yarn forming cavity 2, and a frame 10 is formed by the frame forming cavity 3, and the groove formed by the convex dam portion 4 is formed in the frame 10. 11 will be formed. Incidentally, FIG.
In the figure, the part indicated by reference numeral 12 indicates the position of the gate.

6 and 7, the horizontal die forming cavity and the vertical rail forming cavity are additionally provided to the above-mentioned mold, and the horizontal rail forming cavity and the vertical rail forming cavity are formed. It shows another filter 13 formed by a mold (not shown) having gates provided at appropriate plural points in the intersection, in which reference numeral 14 is a horizontal rail, 15 is a vertical rail, and 16 is a gate. Position of each, and also 17, 1
Reference numerals 8, 19, and 20 respectively represent the same weft thread, warp thread, frame, and groove as those of the filter 7.

[0009]

The present invention is as described above, and by providing the convex weir 4 inside the frame forming cavity 3,
A part of the molten resin that has flowed into the frame forming cavity 3 is returned to the weft forming cavity 1 and the warp forming cavity 2, so that the entire weft forming cavity 1 and the warp forming cavity 2 are completely filled. Therefore, it is possible to prevent the generation of defective products having a missing portion in the mesh and improve the product yield.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a mold.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of a filter.

FIG. 4 is a partially enlarged plan view of the filter.

FIG. 5 is a partially enlarged perspective view of the filter.

FIG. 6 is a plan view of another filter.

FIG. 7 is a partially enlarged perspective view of another filter.

[Explanation of symbols]

 1 Cavity for Weft Thread Formation 2 Cavity for Warp Thread Formation 3 Cavity for Frame Formation 4 Convex Weir 5 Template 6 Template 7 Filter 8 Weft 9 Warp 10 Frame 11 Groove 12 Gate Position 13 Filter 14 Horizontal Cross 15 Vertical Cross 16 Gate Position 17 Weft 18 Warp 19 Frame 20 Groove

Claims (1)

[Claims] 1. A weft forming cavity 1 for a mesh, a warp forming cavity 2 for a mesh, and a frame forming cavity 3 are provided, and a convex weir portion 4 is provided inside the frame forming cavity 3. A method for manufacturing a filter, characterized in that a molten resin is filled in the cavity 1, the weft forming cavity 1, the warp forming cavity 2, and the frame forming cavity 3 of the die to be solidified.