JPH06246793A - 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 a filter. CONSTITUTION:A mold wherein gates 3 are provided at positions wherein cavities 1 for forming the weft yarns of the meshes of a filter and cavities 2 for forming the warp yarns of the meshes of the filter cross each other is constituted and a molten resin is injected into the respective cavities from the gates to be solidified.

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 As shown in FIG. 5, a filter 4 formed of a conventional plastic has a frame 5 with an inside crosspiece 6 formed inside.
In general, the structure is divided by a vertical bar 7 and a space surrounded by the horizontal bar 6 and the vertical bar 7 is covered with a net composed of thinner weft threads 8 and warp threads 9.

When such a filter is molded by a mold, the mold is provided with a frame forming cavity, a horizontal bar forming cavity, a vertical bar forming cavity, a weft thread forming cavity, and a warp thread forming cavity, respectively. In addition, it is necessary to provide a gate for filling the molten resin in each of these cavities, but in the conventional mold, the gate is formed at an appropriate intersection of the horizontal beam forming cavity and the vertical beam forming cavity, for example, as shown in FIG. In general, it was usually provided at a position indicated by reference numeral 10 in FIG.

However, when a filter is actually molded using such a mold, the resin entering the cavity for forming the horizontal rail or the cavity for forming the vertical rail from the gate is thin and has a large resistance. There is a strong tendency that it does not sufficiently flow into the warp forming cavity and mainly flows through the horizontal bar forming cavity or vertical bar forming cavity with low resistance, and then flows toward the frame forming cavity as it is. There is a problem that a resin unfilled portion is generated in the warp forming cavity and a defective product having a missing portion in a mesh is generated.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention has an object of solving the above problems, and manufactures a filter capable of preventing the production of defective products having a missing portion in a mesh and increasing the product yield. It is intended to provide a method.

[0006]

In order to achieve the above object, in the method of manufacturing a filter of the present invention, the position where the mesh weft forming cavity 1 of the filter and the warp forming cavity 2 of the same mesh intersect. A mold is provided with the gate 3 provided in the cavity, and molten resin is filled into the cavity from the gate and solidified.

[0007]

By providing the gate 3 at the position where the weft yarn forming cavity 1 and the warp yarn forming cavity 2 intersect, the resin that has entered from the gate 3 naturally flows through the weft yarn forming cavity 1 and the warp yarn forming cavity 2 as it is. Therefore, the weft forming cavity 1 and the warp forming cavity 2 are not filled with resin.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a part of a mold. This mold is configured to include two mold plates 11 and 12, and one half of the frame forming cavity 13 is connected to the mating surface of one mold plate 11 and both ends are connected to the frame forming cavity 13. A large number of weft forming cavities 1 are provided in parallel at equal intervals, and on the mating surface of the other template 12, the other half of the frame forming cavity 13 and both ends thereof are formed. A large number of warp yarn forming cavities 2 which are respectively communicated with 13 are provided in parallel at equal intervals and orthogonal to the above weft yarn forming cavities 1.

The two template plates 11 and 12 are in a closed state in which the mating surfaces are aligned with each other, and the intersections of the weft forming cavity 1 and the warp forming cavity 2 are in communication with each other. Further, the template 3 is provided with the gates 3 communicating with a plurality of appropriate places among the intersections.

Next, FIGS. 2 to 4 show the filter 14 molded by the above-mentioned mold. In the figure, reference numeral 15 is a weft thread formed in the weft thread forming cavity 1, 16 is a warp thread formed in the warp thread forming cavity 2, and 17 is a frame formed in the frame forming cavity 13. Shows. Incidentally, in FIG. 3, the portion indicated by reference numeral 18 is the position where the gate 3 is arranged.

Incidentally, in the present invention, apart from the horizontal rails and vertical rails provided for reinforcement, the horizontal rails and vertical rails for providing the gate are unnecessary. Therefore, since there is no horizontal bar or vertical bar, the entire net can be made of only weft threads and warp threads.
It is convenient to increase the aperture ratio.

[0012]

The present invention is as described above, and since the gate 3 is provided at the position where the weft forming cavity 1 and the warp forming cavity 2 intersect in the mold for forming the filter, the weft forming cavity 1 And warp forming cavity 2
Since it is possible to eliminate the difficulty of filling the resin into the resin, and to reliably and sufficiently fill the weft forming cavity 1 and the warp forming cavity 2, it is possible to prevent the generation of defective products with missing parts in the mesh. As a result, the product yield can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a part of a mold.

FIG. 2 is a plan view of a filter.

FIG. 3 is a partially enlarged plan view of a filter.

FIG. 4 is a partially enlarged perspective view of a filter.

FIG. 5 is a plan view of a conventional filter.

[Explanation of symbols]

 1 Cavity for forming weft thread 2 Cavity for forming warp thread 3 Gate 4 Filter 5 Frame 6 Weft bar 7 Warp bar 8 Weft thread 9 Warp thread 10 Gate position 11 Template 12 Mold board 13 Frame forming cavity 14 Filter 15 Weft thread 16 Warp thread 17 Frame 18 Gate location

Claims (1)

[Claims] 1. A mold comprising a gate 3 at a position where a mesh weft forming cavity 1 of a filter and a warp forming cavity 2 of the same mesh intersect each other, and a molten resin is supplied from the gate to each cavity. A method for manufacturing a filter, which comprises filling and solidifying.