JPH0379320A - Manufacture of filter and mold therefor - Google Patents

Abstract

PURPOSE:To form a net section by molding by providing a space heating means in the vicinity of a net section molding section formed in the male and femal molds of first and second molds and injection casting molten resin. CONSTITUTION:Net section molding sections 15a and 18a corresponding to the shape of a net section 38 of a filter to be manufactured are formed respectively on a male mold 19 and a female mold 16 of the first and second molds 2 and 7, and spaces 8 and 28 and insulating sections are provided in the vicinity of the net molding sections 15a and 18a of the first and second molds 2 and 17. Molten resin is injection cast into a mold 1 in the state that the heating means is accommodated in the spaces 8 and 28 as the insulating sections of the first and second molds 2 and 17. The molten resin flowed into the net section forming sections 15a and 18a, therefore, is insulated and flowed into the whole of fine mold and becomes hard to be cured. The net section can be formed by molding by said arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a filter, particularly to an injection molding method and an improvement in a mold for manufacturing a filter.

[Conventional technology]

A conventional method for manufacturing a filter by injection molding will be described below with reference to FIG.

The filter manufactured here is, for example, as shown in FIG. 2B,
As shown in C, a cut net (37) is provided at one opening of the cylindrical portion (39), and the cut net (37)
is provided with a reinforcing rib (33) consisting of a central portion, eight radial portions, and two annular portions.

To explain the mold with reference to FIG. 2A, (1) shows the mold, which consists of an upper mold (2) and a lower mold (17) each having a substantially rectangular prism shape. Attached to the site. First, the structure of the upper mold (2) of the mold (1) will be explained. A female mold (16) is formed in the lower part of the upper mold (2), and in this female mold (16), (15a) is the upper outer molding part, and the female mold (16) is formed to form the ribs (33) of the filter. The ceiling part of 16) is the above-mentioned rib (33)
) is cut and formed according to the shape. (15b)
is the outer molded part of the peripheral part, which is the cylindrical part (39) of the filter.
The inner peripheral surface of the female mold (16) is cylindrical so as to form
Cut and formed.

(3) is a hemispherical nozzle fixing part provided at the center of the upper surface of the upper mold (1), and is fixed so that the tip of the nozzle (30) that injects the molten resin of the injection molding machine fits therein. Ru.

(31) is a resin inflow hole that communicates with the nozzle fixing part (3), extends downward substantially vertically, and communicates with the female mold (16), and its lower end serves as a resin injection port (32) in the upper outer molding part ( 15
a) Formed at the center of. (35) is a cooling part consisting of linear holes, which horizontally penetrates the upper mold (support), one end of which serves as the coolant inlet (10), and the other end serves as the coolant outlet (10).
11). A plurality of cooling units 8 (35) are provided in the upper mold (2) so as to be parallel to each other, and a pump, a cooling machine, etc. is installed between the coolant inlet (lO) and the coolant outlet (11). The coolant such as water is connected to the cooling part (3
5) to cool the upper mold (2).

Next, the lower mold (17) will be explained. (19) is the lower mold (
17) is inserted into the female mold (16) of the upper mold (2). In this right mold (19), (18a) is the upper inner molded part, which is the male mold (19).
19) consists of a flat recess at the bottom to prevent the inflow of molten resin, which is formed by processing the upper part of the recess, and the resin,
A circular cut net (37) made of metal or the like is placed.

The depth of this recess is determined by the diameter of the wire used in the cut net (37). (18b) is formed by cutting the outer circumferential surface of a male mold (19) into a cylindrical shape so as to form the inner surface of the cylindrical portion (39>) of the filter at the internal solidification molding part of the circumferential surface.

(36) is a cooling section consisting of linear holes, and the lower mold (17)
horizontally through the top of the coolant inlet (2
0), and the other end is a coolant outlet (21).

And, like the upper mold (2), the above-mentioned cooling part (36)
A plurality of these are provided in parallel in the lower mold (17), and a pump, a cooler, etc. are connected between the coolant inlet (20) and the coolant outlet (21), and the coolant such as water is supplied to the cooling part. (36). In addition, the above-mentioned cooling section (3
6) may be cylindrical depending on the shape of the filter to be molded, and hot water may be passed through the cooling section (36) depending on the molten resin used as the material.

Next, a method for manufacturing a filter having the shape shown in FIGS. 2B and 2C will be described.

First, cut a net (as shown in Figure 2B) into the recess of the upper and inner molding part (18a) of the male mold (19) of the lower mold (17).
For example, nylon wire, metal wire, etc. are woven and cut into the desired shape) (37) is placed, and then the lower mold (17) is placed on the female mold (16) of the upper mold (2). ) is inserted into the male mold (19), the two are pressed together under high pressure, and the cut net (37) is inserted into the female mold (2) of the upper mold (2).
16) upper outer molding part (15a) and lower mold (17)
) is held and compressed by the upper inner molding part (18a) of the male mold (19). And nozzle (30
) is fixed to the nozzle fixing part (3) of the upper mold (2) of the metal (1), and the temperature from the tip of this nozzle (30) is approximately 180°C to 3°C.
Melting resin at a temperature of 00°C (for example, polypropylene, polyethylene, nylon 6, nylon 66, etc.)
is injected, and this molten resin flows from the resin injection port (32) through the resin inflow hole (31) into the upper mold (2) of the mold (1).
and a lower mold (17), and flows into the mold for molding the filter. The molten resin filled inside the mold forming the filter is cooled by the coolant passing through the cooling section (35) of the upper mold (2) and the cooling section (36) of the lower mold (17). The temperature reaches about 70°C to 80°C in about 30 to 40 seconds and hardens. After that, when the upper mold (2) and the lower mold (17) are separated, FIG.
A cut net (31) is inserted into one opening of the cylindrical portion (39) shown in C.
), and the cut net (31) is provided with reinforcing ribs (33).

[Problem to be solved by the invention]

The conventional filter manufacturing method using injection molding described above has the following drawbacks.

First, a separately manufactured net made of resin such as nylon or polypropylene, metal, etc. is cut into a predetermined shape depending on the structure and shape of the filter to be manufactured, or is molded together with the net into a predetermined shape. The filter is processed to maintain its shape, and then placed in a recess with a depth corresponding to the wire diameter of the wire used, which is provided in the area where the mesh portions of the pair of molds that make up the mold are to be formed. The filters are manufactured by insert molding, which requires manual labor and is difficult to automate, which increases labor costs and the costs required to manufacture the net, so the price of the filter is high. It gets expensive.

Also, due to variations in the diameter of the wire used in the net, etc.
During manufacturing, molten resin partially flows into the mesh and blocks the mesh, causing variations in filter quality.

Furthermore, the pair of molds that make up the mold are pressed together under fairly high pressure, and as a result, the cut mesh (especially when made of metal wire) is compressed and molded under high pressure. is easily worn out.

In view of this, the present invention proposes a filter manufacturing method and a filter manufacturing mold in which the mesh portion can also be formed by molding.

[Means to solve the problem]

The first aspect of the present invention is a metal mold comprising first and second molds (2) and (17) formed with a male mold (19) and a female mold (16), respectively, depending on the shape of the filter to be manufactured. A method for manufacturing a filter in which a mold (1) is used and a molten resin is injected into the mold (1) to manufacture a filter, the first and second molds (2) and (17) A mesh molding part (15) corresponding to the shape of the mesh part (38) of the filter to be manufactured is attached to the male mold (19) and the female mold (16).
a).

(18a) are formed respectively, and the first and second
Mold (2), net molding part (15a) of (17),
In the vicinity of (18a), there is a space (8) as a heat-retaining part,
(28) A mold (1) is used, and a heating means is placed in the spaces (8) and (2g) serving as the heat-insulating parts of the first and second molds (2) and (17). In this state, molten resin is injected into the mold (1).

The second invention provides the first and second invention in the first invention.
molds (2), (17), male mold (19) and female mold (
In step 16), mesh moldings aB (15a), (18a) corresponding to the shape of the mesh (38) of the filter to be manufactured are formed, respectively, and the first and second molds (2), (
17) A space (8) serving as a heat retaining part is provided near the net molded parts (15a) and (18a).

(28), and first and second molds (2);
(17) Net molded portions (15a) of the male mold (19) and female mold (16).

(18a) There is a space (
14), (24) are used, and a space (8) is used as a heat retaining part of the first and second molds (2), (17).

A heating means is placed in (28), and a cooling liquid is placed in spaces (14) and (24) serving as cooling sections, and molten resin is injected into the mold (1).

The third aspect of the present invention is a filter comprising first and second molds (2) and (17) formed with a male mold (19) and a female mold (16), respectively, depending on the shape of the filter to be manufactured. In the production mold (1), the first and second molds (2)
.

In the male mold (19) and female mold (16) of (17), mesh molding parts (15a) and (18a) are respectively formed according to the shape of the mesh part (38) of the filter to be manufactured, and Spaces (8) and (28) as heat retaining parts are provided near the mesh molding parts (15a) and (18a) of the first and second molds (2) and (17), respectively. be.

A fourth aspect of the present invention provides the first and second aspects of the third aspect of the present invention.
The mesh part (38) of the filter to be manufactured is placed in the male mold (19) and female mold (16) of molds (2) and (17).
The net portion molding portions (15a) and (18a) corresponding to the shape of are formed respectively, and the first and second molds (2) and (1
7) Spaces (8) and (28) as heat retaining parts are provided near the mesh molding parts (15a) and (18a), and the first and second molds (2).

(17) The net part molding part (15a) of the right mold (19) and the female mold (16), the part (15b) other than (18a)
), (18b) are provided with spaces (14) and (24) as cooling sections, respectively.

[Effect]

According to the first aspect of the present invention, the first and second molds (2), (17) of the mold (1), the mesh molding portion (15a), (1
8a) A space (8a) serving as a heat-retaining section provided near the
), (28) with the heating means placed in the mold (
1) Inject the molten resin into the injector.

According to the second invention, the first and second molds (2) of the mold
, (17) Net molding part (15a>, (18a
) A space (8) as a heat insulation part provided near the
(2g) contains a heating means, and a part (15b) other than the wi part molding part (15a), (18a),
(18b) Space (14) as a cooling section provided in
), (24) with cooling liquid in the mold (
1) Inject the molten resin into the injector.

According to the third invention, the first and second molds (2).

(17), the first and second types (2), (17
) Spaces (8) and (28) as heat-retaining parts provided near the net molded parts (15a) and (18a)
Next, with the heating means contained, molten resin is injected into the space consisting of the male mold (19) and female mold (16) of the combined first and second molds (2) and (17).

According to the second invention, the first and second molds (2).

(17), the first and second types (2), (17
)'s mesh molding Im (15a), (18a) spaces (8), (28) as heat-retaining parts provided in the vicinity of
A heating means is placed in the mesh molded part (15a),
(18a) The right side of the combined first and second molds (2) and (17) is filled with cooling liquid in the spaces (14) and (24) that serve as cooling parts provided in the parts other than (18a). Molten resin is injected into the space formed by the male mold (19) and female mold (16).

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIG.

The filter manufactured here is similar to the filter described in FIG. 2, for example, but the net is made by molding together with the cylindrical portion and reinforcing ribs.

To explain the mold with reference to FIG. 1A, (1) shows the mold, which consists of an upper mold (2) and a lower mold (17), and is attached to a predetermined part of an injection molding machine (not shown).

First, the structure of the upper mold (2) of the mold (1) will be explained.

A female mold (16) is formed in the lower part of the upper mold (2), and in this female mold (16), (15a) is an upper outer molding part, and the upper outer surface of the filter, that is, the rib (
33) Upper layer and mesh part [as shown in Figure 1C, a mesh part in which a large number of mutually parallel semi-cylindrical thin rods intersect with each other]
The upper part of the female mold (16) is cut to form the upper surface of the mold (38). (15b) is a circumferential outer surface molding section, which is formed by cutting the circumferential surface of the female mold (16) into a cylindrical shape so as to form the outer surface of the cylindrical section (39) of the filter.

[3] is the nozzle fixing part, which is the nozzle (30) of the injection molding machine.
are fixed so that they fit together. (31) is the resin inflow hole,
It communicates with the nozzle fixing part (3) and extends downward approximately vertically to connect with the female mold (16), the lower end of which is connected to the resin injection port (32).
It is formed at the center of the upper outer molded part (15a).

This resin injection hole (31) is a tubular resin inflow hole (31a) extending vertically downward from the nozzle fixing part (3).
and communicates with the tubular resin inflow hole (31a) to increase the flow rate of the molten resin from the resin injection port (32) into the mold (1) and to enhance the heat retention effect.
A disc-shaped resin inflow hole (31b) having a diameter larger than the inner diameter of the tubular resin inflow hole (31a), and a seed-shaped resin in communication with the disc-shaped resin inflow hole (31b) and extending downward. Consists of an inflow hole (31C).

(8) is an annular heat retaining part, which is provided inside the mold (1) close to the upper outer surface molding part (15a) of the female mold (16), and has a heat retaining agent inflow a made of linear holes, respectively. 'ls
(6) and the heat insulating agent outlet (7), respectively. Further, the free end of the heat insulating agent inlet (6) is used as a heat insulating agent inlet (4), and the free end of the heat insulating agent outlet (7) is used as a heat insulating agent outlet (5). Then, a pump, a heater, etc. are connected between the heat insulating agent inlet (4) and the heat insulating agent outlet (5), and as a heat insulating agent,
For example, it keeps water, oil, etc. at a temperature of 60℃ to 100℃!
is (8), injected from the nozzle (30) and passed through the resin inlet (31), and injected from the resin injection port (32) to mold the upper outer surface of the upper mold (2) 1
ts (15a) and the upper inner molding part of the lower mold (17) (
18a) The resin flowing in between is kept at a predetermined temperature.

(14) is an annular cooling part, which is provided inside the mold (1) in close proximity to the curved outer surface molding part (15b) of the female mold (16), and has a cooling agent each consisting of linear holes. Inflow part (
12) and a coolant outlet (13), respectively.

Furthermore, the free end of the coolant inlet (12) is connected to the coolant inlet (10).
) and the coolant leaked! The free end of (13) serves as a coolant outlet (11). Then, a pump, a cooler, etc. are connected between the coolant inlet (10) and the coolant outlet (11), and water at a temperature of 5°C to 30°C is supplied as the coolant to the cooling section (
24), the resin is injected from the injection port (32), and the resin is injected into the peripheral outer molding part (15kl) of the upper mold (2).
) and the curved internal hardening part (18b) of the lower mold (17)
The temperature of the resin flowing in between is lowered.

Next, the lower mold (17) will be explained. (19) is the lower mold (1
The male mold formed on the upper side of 7) is the female mold of the upper mold (2) (
16). In this male type (19), (
18a) is the upper inner surface molding part, which is the upper inner surface of the filter;
That is, the lower surface of the rib (33) and the net portion (38) of the rib (33 in FIG. 1B) [as shown in FIG. The upper part of the male mold (19) is cut to form the mold. (1
8b) is the internally solidified part of the peripheral surface, which is the cylindrical part of the filter.
The outer peripheral surface of the male mold (19) is cut into a cylindrical shape to form the inner surface of the male mold (19).

(28) is a heat retaining part, and its shape has a shape in which large diameter and small diameter cylinders are stacked one above the other like a rivet, and the upper cylindrical part is the upper inner molded part ( 18a
), and its lower cylindrical portion communicates with a heat insulating agent inlet (15) and a heat insulating agent outlet (27), each comprising a linear hole. In addition, the heat insulating agent inlet part (
The free end of 27) serves as a heat insulating agent inlet (25), and the free end of the heat insulating agent outlet (15) serves as a heat insulating agent outlet (26).

Then, the heat insulator inlet (25) and the heat insulator outlet (26)
), a pump, a heater, etc. are connected between the parts, and as a heat insulating agent, water at a temperature of, for example, 60°C to 100°C is passed through the heat insulating part (28), injected from the resin injection port (32), and is injected into the upper mold ( 2)
The temperature of the resin flowing between the upper outer molded part (15a) of the lower mold (17) and the upper inner molded part (18a) of the lower mold (17) is maintained.

(24) is an annular cooling part, which is provided inside the mold (1) in close proximity to the solid molded part (18b) on the peripheral surface of the male mold (19), and has a cooling agent each consisting of linear holes. Inflow l5(
22) and a coolant outlet (23), respectively.

Furthermore, the free end of the coolant inlet (22) is connected to the coolant inlet (20).
), and the free end of the coolant outlet (23) is a coolant outlet (21). Then, a pump, a cooler, etc. are connected between the coolant inlet (20) and the coolant outlet (21),
As a coolant, for example, water at 5°C to 30°C is used in the cooling section (2
4), and is injected from the resin injection port (32) to the peripheral outer surface molding part (15b) of the upper mold (2) and the lower mold (
17) Lower the temperature of the resin flowing between the peripheral internal solidification molding parts (18tl).

Place the lower mold (17) l::, (29) is a gas bend,
It is formed on a part of the lower surface around the male mold (19) on the lower mold (17), and the male mold (19) of the lower mold (17) is formed on the female mold (16) of the upper mold (2). is inserted, the lower mold (
17) Internal hardening molded part (18b) of the male mold (19)
and the peripheral outer surface molding part of the female mold (16) of the upper mold (2) (
15b) From the lower end of the space formed between the lower molds (17
) and is used to release gas generated during product molding to the outside.

Next, a method for manufacturing a filter having the shape shown in FIGS. 1B and 1C will be described.

First, the right mold (19) of the lower mold (17) is inserted into the female mold (16) of the upper mold (2), and after the two are combined, the air inside the mold and the gas inside the injection resin are improved. Therefore, the nozzle (30) is connected to the mold (1) under a lower pressure than the conventional example, that is, 175 or less of the normal pressure (0 to 30 kg/cd for a product projected area of 120 c-). A molten resin (for example, polypropylene, polyethylene, nylon 6, nylon 66, etc.) that is fixed to the nozzle fixing part (3) of the upper mold (2) and has a temperature of approximately 180°C to 300°C from the tip of this nozzle (30). is ejected.

On the other hand, the heat insulating agent inlet (4) of the upper mold (2) and lower mold (17)
).

The heat insulating agent injected from (25) respectively flows into the heat insulating agent inflow section (
6), (15) into the heat retaining parts (8), (28), and further passes through the heat retaining agent outlet parts (7), (27) to the heat retaining agent outlet (5).

(26).

The coolant injected from the coolant inlets (10) and (20), respectively, flows through the coolant inflow ports (12) and (22).
The coolant flows into the cooling parts (14), (24) through the coolant outlet parts (13), (23), and flows out from the coolant outlet ports (11), (21) through the coolant outlet parts (13), (23>).

The molten resin injected from the tip of the nozzle (30) passes through the resin inlet hole (31) and from the resin injection port (32) into the mold (
1) It flows into the mold for molding the filter, which is formed by the combination of the upper mold (2) and the lower mold (17). The molten resin that has flowed into the part of the mold that forms the upper outer surface and inner surface of the filter (see FIG. 1B) is then transferred to the heat retaining part (8).
(28) The temperature is kept warm by the moisturizing agent (28), and the mold and mesh portion (33) forming the ribs (33) of the filter are heated.
8) so as not to harden before flowing into the entire fine mold forming the cylindrical part (39) of the filter, and being cooled by the coolant in the cooling parts (14), (24). Gas accumulation within the inflowing resin is prevented, and its temperature is cooled and hardened. And after this,
When the upper mold (2) and lower mold (17) are separated, an integrally molded filter as shown in FIG. 1 is obtained.

It will be done. The ribs (33) of this filter have a structure as shown in the first diagram. That is, the first drawing is a rib (33
) and the cross section of the mesh part (38), the ribs (33) should have a narrow width and a shallow depth to facilitate the flow of molten resin into the mesh part (38). It won't be, but
If this is done, the holding strength of the rib (33) against the net portion (38) will be reduced, so to avoid this, the rib (33) is formed into a U-shape or an H-shape.

In addition, the net portion (38) has a shape as shown in FIG. can.

In addition, in the above-mentioned embodiment, a method for manufacturing a filter and a mold for manufacturing the filter were described in which a mesh portion was formed at one opening of the cylindrical portion, and reinforcing ribs were formed on the mesh portion. As a filter, a mesh part is formed in one opening of a cylindrical part, and a frame is formed in the other opening, and the cylindrical part itself is also a mesh part, and each of the mesh parts has reinforcing ribs. It is also possible to make filters with a mesh formed on the frame, and flat filters with reinforcing ribs formed on the mesh. The shape of the cylindrical part, the shape and structure of the mesh part, the shape of the linear part of the mesh part, the shape of the ribs, etc. are arbitrary, and the first and second parts constituting the mold can be adjusted accordingly. The shapes of the male and female molds, the shape, structure, arrangement, etc. of the heat retaining part and the cooling part are arbitrary, and the presence or absence of the cooling part is also arbitrary.

In addition, in the above-mentioned embodiment, mesh molding portions corresponding to the shape of the mesh portion of the filter to be manufactured are formed in the male mold and the female mold of the first and second molds, respectively, and 1st
A space serving as a heat retaining part is provided near the mesh molding part of the second mold, and near parts other than the mesh molding part of the male mold and the female mold of the first and second molds, A space serving as a cooling section is provided, and a heated liquid is stored in the space serving as the heat retaining section of the first and second molds, and the molten resin is poured into the mold with the cooling liquid stored in the space serving as the cooling section. We have explained the case of injection injection, but if almost the entire filter is a mesh part (regardless of whether it has ribs or not), the first and second molds, male and female, A mesh molded part corresponding to the shape of the mesh of the filter to be manufactured is formed, and a space is provided as a heat retaining part near the mesh molded parts of the first and second molds, and a space is provided as a cooling part. Alternatively, the molten resin may be injected into the mold with no space provided, and the heated liquid is simply placed in the space serving as the heat insulating part. Furthermore, the space serving as the heat retaining section described above may contain not only a heated liquid but also an electric heater or the like.

〔Effect of the invention〕

According to the present invention described above, it is possible to obtain a filter manufacturing method and filter manufacturing mold in which the mesh portion can also be formed by molding.

Furthermore, according to the manufacturing method of the present invention, the mesh part can also be formed by molding, so there is no need to insert the mesh into the mold, eliminating the need for manual work, and facilitating automation using industrial robots, etc. As a result, the molding cycle can be significantly shortened, making it possible to manufacture inexpensive filters.

In addition, since the mesh part of the filter is molded by the mesh part molding parts formed in the male and female molds of the first and second molds, there is almost no variation in the filter, and high quality filters can be obtained. Obtainable.

Furthermore, since there is no need to insert another mesh into the mold, the pressure required to join the first and second molds together is much lower than in the conventional case, and mold wear is reduced. , far less than the conventional example.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a method of manufacturing a filter according to one embodiment, and FIG. 2 is a diagram showing a conventional method of manufacturing a filter. (4), (25) are heat insulator injection ports, (6), (1
5) is the insulator inlet, (8), (28) are the insulator, (7), (27) are the insulator outflow, (5),
(26) is the heat insulating agent outlet, (31) is the resin inflow hole,
(31a) is a tubular resin inflow hole, (31b) is a disk-shaped resin inflow hole, (31C) is a seed-shaped resin inflow hole, and (38) is a net.

Claims (1)

[Claims] 1. Using a mold consisting of a first mold and a second mold each having a male mold and a female mold, depending on the shape of the filter to be manufactured, molten resin is injected into the mold. In the method for producing a filter, the filter is molded into the male and female molds of the first and second molds according to the shape of the mesh of the filter to be manufactured. using a mold in which a space is provided as a heat retaining part in the vicinity of the mesh part molding part of the first and second molds, A method for manufacturing a filter, comprising injecting molten resin into the mold while a heating means is accommodated in the space serving as the heat retaining part. 2. Using a mold consisting of a first mold and a second mold having a male mold and a female mold, respectively, depending on the shape of the filter to be manufactured, inject molten resin into the mold to make the filter. In the method for manufacturing a filter, mesh forming portions corresponding to the shape of the mesh of the filter to be manufactured are formed in the male and female molds of the first and second molds, respectively. Also, a space serving as a heat retaining part is provided near the mesh molding part of the first and second molds,
In addition, a mold is used in which a space is provided as a cooling section in the vicinity of a portion of the male mold and the female mold of the first and second molds other than the mesh molding portion, and A heating means is contained in the space serving as the heat retaining part of the second type, and a cooling liquid is contained in the space serving as the cooling part,
A method for manufacturing a filter, comprising injecting molten resin into the mold. 3. In a filter manufacturing mold consisting of a first mold and a second mold having a male mold and a female mold, respectively, according to the shape of the filter to be manufactured, the male mold of the first mold and the second mold A mesh molding portion corresponding to the shape of the mesh portion of the filter to be manufactured is formed on each of the female molds and the female mold, and
A mold for manufacturing a filter, characterized in that a space serving as a heat retaining part is provided near the mesh molding part of the first and second molds. 4. In a filter manufacturing mold consisting of a first mold and a second mold having a male mold and a female mold, respectively, according to the shape of the filter to be manufactured, the male mold of the first mold and the second mold A mesh molding portion corresponding to the shape of the mesh portion of the filter to be manufactured is formed on each of the female molds and the female mold, and
A space serving as a heat retaining portion is provided near the mesh molding portions of the first and second molds, and the mesh molding portions of the male mold and female mold of the first and second molds are provided. A mold for manufacturing a filter, characterized in that a space is provided as a cooling part in the vicinity of the other parts.