JP2005349362A - Ventilation member manufacturing method, ventilation member provided by the same, and housing using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation member manufacturing method capable of easily manufacturing a ventilation member according to shapes of openings of various housings. <P>SOLUTION: A cylindrical member 12 is manufactured by extrusion molding of a resin using a die formed with a core at its center, a filter member 11 is provided at one end of this cylindrical member 12, and the filter member 11 side of the cylindrical member 12 is fitted in a bottomed cylindrical cover member 41 so as to form a passage between the inner periphery of the cylindrical member 12 and the outer periphery of the cover member 41, and between the filter member 11 and the cover member 41. The cylindrical member 12 which is a main component of the ventilation member 12, and is necessary for changing the shape according to the opening shape 44 of the housing 43 is manufactured by extrusion molding, thereby enabling the easy manufacturing of the ventilation member 12 according to the opening shapes of the various housings 43. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a ventilation member, a ventilation member obtained thereby, and a casing using the ventilation member.

  Automotive headlamps, rear lamps, fog lamps, turn lamps, motors, various pressure sensors, pressure switches, automotive electrical parts such as ECUs (electronic control units), mobile phones, cameras, electric razors, electric toothbrushes and lamps for outdoor use Ventilation members are attached to the various cases.

  The ventilation member is installed to prevent the intrusion of water and dust into the inside of the housing, while propagating sound, releasing the gas generated inside the housing, and mitigating pressure changes inside the housing due to temperature changes. It plays various roles depending on the type of housing to be used.

FIG. 9 shows an example of a conventional ventilation member. As shown in the drawing, the ventilation member 71 is a tubular body formed in an L shape or a U shape (not shown), and is attached to an opening 70 a of the housing 70. 70a is used to prevent intrusion by preventing water and dust from being directly applied. FIG. 10 shows another example of a conventional ventilation member. As shown in the figure, the ventilation member has a substantially cylindrical body 2 inserted into a bottomed cylindrical cover part 1, and the cover member 1 has an inner periphery and an outer periphery of the substantially cylindrical body 2. Between the filter member 10 installed on the bottom surface of the component 1 and the bottom of the substantially cylindrical body 2, the protrusion 7 formed on the substantially cylindrical body 2 and on the bottom surface of the cover component 1, respectively. An air passage is formed by the base 5, and an attachment portion 4 for attaching to the opening 80 a of the housing 80 is formed at the top opening 2 a of the substantially cylindrical body 2 (see Patent Document 1). As a method for molding these ventilation members, a method by injection molding has been proposed. However, the size (shape) of the opening of the housing for attaching the ventilation member varies depending on the various housings. When injection molding is used like the ventilation member, the injection mold is generally expensive. Therefore, there is a problem that it is difficult to cope with the shapes of the openings of various cases.
JP 2001-143524 A

  The present invention has been made in view of such circumstances, and provides a method for manufacturing a ventilation member that can easily produce a ventilation member according to the shape of the opening of various housings at low cost. Objective.

  In order to achieve the above object, the manufacturing method of the present invention is such that the end side of a cylindrical part having a filter member attached to one end is fitted into a bottomed cylindrical cover part. A ventilation member manufacturing method in which a ventilation path is formed between an inner periphery of a cylindrical component and an outer periphery of the cover component, and between the filter member and the bottom of the cover component, and a core is formed at the center thereof A cylindrical part is manufactured by extrusion molding of resin using the formed die, the filter member is attached to one end of the cylindrical part, and the air passage forms the filter member side of the cylindrical part As described above, the manufacturing method is to fit into the bottomed cylindrical cover part.

  The manufacturing method of the present invention is a main component member of a ventilation member, and by manufacturing a cylindrical part whose shape needs to be changed depending on the shape of the opening of the housing by extrusion molding, various housing openings. It is possible to easily produce a ventilation member corresponding to the shape at low cost.

  In the manufacturing method of the present invention, a plurality of protrusions extending in the extrusion direction are formed on the inner wall of the die in the circumferential direction, and the protrusions extend in the axial direction on the outer wall of the tubular part during the extrusion molding. A plurality of protrusions may be formed in the circumferential direction, and the protrusion may serve as a spacer, and the air passage may be formed between the outer periphery of the tubular part and the inner periphery of the cover part.

  In the manufacturing method of the present invention, in addition to the core formed at the center, one or more cores formed around the core are formed on the die, and the cylindrical part is formed by the core during the extrusion molding. A communication hole extending in the length direction is formed in the wall thickness of the cylindrical part, the filter member is attached to one end of the cylindrical part so as not to block the communication hole, and an outer periphery of the cylindrical part In place of the air passage between the cover part and the inner periphery of the cover part, the communication hole is used as an air passage, and the filter member side of the cylindrical part is fitted into the cover part so as not to block the communication hole. You may make it do.

  In the manufacturing method of the present invention, one or more abutting portions are formed on the bottom surface of the bottomed cylindrical cover component, the abutting portion serves as a spacer, and the filter member and the bottom surface of the cover component A space serving as a ventilation path may be formed between the two.

  In the manufacturing method of the present invention, the air permeability of the obtained filter member is appropriately determined by the strength of the casing to which the ventilation member is attached, the gas part volume, the ventilation diameter, and the like. From the point of elimination, the air permeability resistance (Gurley) measured in accordance with JIS P 8117 is preferably 1000 seconds or less, more preferably 100 seconds or less, and still more preferably 50 seconds or less.

  In the manufacturing method of this invention, it is preferable that the said filter member contains a polytetrafluoroethylene (PTFE) porous membrane.

  In the manufacturing method of the present invention, the filter member may be subjected to at least one of a water repellent treatment and an oil repellent treatment.

  Next, the ventilation member of the present invention is a ventilation member manufactured by the manufacturing method of the present invention. Moreover, the housing | casing of this invention is a housing | casing which has the opening part for ventilation | gas_flowing, The ventilation member of this invention is attached to the said opening part. The use of the housing of the present invention is not particularly limited, and includes, for example, electric parts for automobiles such as ECUs (electronic control units), lamps, motors, various sensors, pressure switches, actuators, mobile phones, cameras, electric razors, electric motors. Examples include toothbrushes and lamps for outdoor use. Among these, it is preferable to use for the housing | casing of a lamp | ramp and an electrical component.

  Next, the method for producing the ventilation member of the present invention will be described with examples.

  First, a cylindrical part is produced by resin extrusion using a die. Examples of the resin include thermoplastic elastomers and thermoplastic resins. Examples of these thermoplastic elastomers or thermoplastic resins include polyolefins, polyesters, polyphenylene sulfides, and polyacetals. The inner shape of the die is not particularly limited, and may be, for example, a shape corresponding to a cover component described later. The shape of the core is not particularly limited, and may be, for example, a shape according to the mounting portion of the housing. Even if the shape of the opening of the housing is two or more, if the shape is smaller than the inner diameter of the die, the shape of the core can be changed by simply changing the shape of the core according to the shape of the opening of the housing. Can be handled without changing the shape. Therefore, an expensive multi-cavity mold such as injection molding is unnecessary, and according to the manufacturing method of the present invention, it is possible to easily cope with the shape of the opening of various housings at low cost. In addition, there is no step of removing the molded product from the liner, and there is no problem of molding defects such as weld lines.

  After the resin is extruded into a cylindrical shape by extrusion molding, it is preferable to cut the molded product into an arbitrary length. The length of the cutting can be arbitrarily set according to the use state of the ventilation member, for example. The cutting method is not particularly limited, and examples thereof include a method of applying a rotary blade to the cylindrical body.

  Next, the opening is closed by attaching a filter member to one end of the tubular part. The filter member prevents entry of dust and water from the outside, which cannot be prevented by a bottomed cylindrical cover component described later, into the housing. The material of the filter member is selected, for example, according to the performance required of the casing to be attached to the ventilation member. As long as the performance required for the ventilation member is such that it prevents water from splashing and large dust from entering, the filter member material may be, for example, a woven or non-woven fabric made of a fiber material, whether natural or synthetic. A powder sintered porous body, a foamed body, and the like can be used. If the performance required for the ventilation member is high waterproof and dustproof, as the material of the filter member, for example, a microporous film produced by a stretching method, an extraction method or the like can be used. As the microporous membrane, a PTFE porous membrane is particularly preferable from the viewpoint of water repellency, heat resistance, and chemical resistance of the material itself. The pore diameter of the microporous membrane is preferably in the range of 0.01 to 20 μm, more preferably in the range of 0.1 to 10 μm, and still more preferably 0.5, from the viewpoint of waterproofness and air permeability. It is in the range of -10 μm. The filter member may be a single layer using one type of member, or may be a laminate of a plurality of types of members. When a microporous membrane is used as the material, breathable materials such as woven fabrics, nonwoven fabrics, and nets of other materials may be laminated as a reinforcing material.

  The filter member may be subjected to water repellent treatment or oil repellent treatment as necessary. The treatment method of the water repellent treatment or the oil repellent treatment is not particularly limited, and examples thereof include a method of applying a commercially available water repellent treatment agent or oil repellent treatment agent to the filter member and then drying it.

  The air permeability of the ventilation member is as described above.

  The method for attaching the filter member to one end of the cylindrical part is not particularly limited, and examples thereof include methods such as heat fusion, ultrasonic welding, adhesion using an adhesive, an adhesive, and the like. .

  Next, an example of the cylindrical part will be described based on the drawings together with the internal shape of the die used for manufacturing the cylindrical part.

  FIG. 4A shows an example of the internal shape of a die used for extrusion molding according to the present invention and having a core placed at the center. As shown in the figure, the internal shape 14 of the die of this example is a shape in which a circular core 13 is installed at the center and four protrusions 15 are formed at equal intervals in the circumferential direction. In FIG. 4A, the inner circle indicates the outer periphery of the core, and the outer line indicates the inner periphery of the in-die shape. And as shown in FIG.4 (b), the cylindrical part 12 was produced by cut | disconnecting the cylindrical body produced by the extrusion molding using this die | dye by arbitrary length, and the one end part is produced. The filter member 11 is attached. In FIG. 4B, reference numeral 16 denotes a protrusion formed by the protrusion 15 shown in FIG. In this example, the number of the protrusions 15 and the protrusions 16 in the circumferential direction is four, but the number of the protrusions 15 and protrusions 16 is not particularly limited as long as it is one or more. The range is preferably 2 to 20, more preferably 4 to 10.

  Next, another example of the internal shape of the die is shown in FIG. As shown in the figure, the inner shape 25 of the die of this example is provided with a core 24 at the center, and eight circular communication hole forming cores 26 are formed around the center core 24 and arranged in a circle. It has become a shape. In FIG. 5 (a), the innermost circle indicates the outer periphery of the core, the outermost circle indicates the inner periphery of the shape in the die, and the eight circles therebetween are used for forming the communication hole. The outer periphery of the core is shown. When a cylindrical part is produced by extrusion molding using this die, eight communication holes are formed in the thick part, and this becomes an air passage. As shown in FIG. 5B, the filter member 21 is attached to one end portion of the cylindrical part 22 so as not to block the communication hole 23. In this example, the number of the cores for forming the communication hole is eight, but the number may be any number as long as it is one or more, for example, in the range of 1 to 100, preferably The range is from 2 to 10, more preferably from 4 to 10. In this example, the axial cross-sectional shape of the core for forming the communication hole is a circular shape. However, the shape is not limited to this, and may be another shape such as an elliptical shape or a rectangular shape. .

  Next, still another example of the internal shape of the die is shown in FIG. As shown in the figure, the internal shape 34 of the die of this example is a shape in which a core 33 having a square axial section is formed at the center. In FIG. 6A, the inner square indicates the outer periphery of the core, and the outer circle indicates the inner periphery of the die inner shape. As shown in FIG. 6B, a filter member 31 is attached to one end of a cylindrical part 32 produced using the same.

  Next, the bottomed cylindrical cover part can be made of, for example, the same thermoplastic elastomer or thermoplastic resin as the cylindrical part. The shape of the bottomed cylindrical cover part is not particularly limited as long as the cylindrical part can be inserted therein and a predetermined air passage can be formed. Further, as described above, one or more abutting portions are formed on the bottom surface of the bottomed cylindrical cover component, and the abutting portion is used as a spacer between the filter member and the cover component bottom surface. A space serving as a ventilation path may be formed. The manufacturing method of the bottomed cylindrical cover part is not particularly limited, and can be manufactured by a method such as injection molding, extrusion molding, or cutting. The cover part can be capped by fitting the filter part side of the cylindrical part into the cover part, and the filter member can be protected from stepping stones from outside, adhesion of dirt, dust and water intrusion.

  FIG. 7 shows an example of a bottomed cylindrical cover component according to the present invention. As shown in the figure, the bottomed cylindrical cover component 41 of this example has three protruding portions 42 formed on the bottom surface thereof at equal intervals in the circumferential direction. In FIG. 7, the bottom of the bottomed cylindrical cover part 41 is located on the upper side. In this example, the number of protruding portions is three, but the number of protruding portions is not particularly limited as long as it is 1 or more, and is, for example, in the range of 1 to 100, preferably 1 to 10 It is a range, More preferably, it is the range of 2-6 pieces. If the inner diameter of the cover part is slightly smaller than the outer diameter of the end of the tubular part on the filter member side, the cover part can be fixed to the cylindrical part by the elastic force of the cover part.

  In FIG. 8, the other example of the bottomed cylindrical cover component in this invention is shown. As shown in the figure, the bottomed cylindrical cover part 61 of this example is formed with three protrusions 62 extending in the axial direction on the inner wall at equal intervals in the circumferential direction, and reaches the bottom of the cover part 61. A protrusion 63 is formed at the tip of the protrusion 62. In FIG. 8, the bottom of the cover part 61 is located on the upper side. In this example, the number of protrusions and protrusions is three, but the number of protrusions and protrusions may be any number as long as it is one or more, for example, in the range of 1 to 100, Preferably it is the range of 1-10 pieces, More preferably, it is the range of 2-6 pieces. In the cover component of this example, the protrusion 62 is in pressure contact with the outer wall of the cylindrical component, and is thereby fixed to the cylindrical component.

  Next, an example of the ventilation member of the present invention will be described based on the drawings.

  FIG. 1 shows an example of the ventilation member of the present invention. This example is an example in which the cylindrical part 12 shown in FIG. 4B is covered with the bottomed cylindrical cover part 41 shown in FIG. As shown in the figure, the ventilation member of this example is used by attaching the end of the tubular part 12 opposite to the side where the filter member 11 is attached to the opening 44 of the housing 43. The protruding portion 42 serves as a spacer, and a space is formed between the filter member 11 and the bottom surface of the cover part 41, which serves as an air passage, and a plurality of protrusions 16 formed on the outer wall of the cylindrical part 12. As a spacer, a space is formed between the outer periphery of the tubular part 12 and the inner periphery of the cover part, and this becomes a ventilation path. As indicated by an arrow 27 in FIG. 1, these air passages allow the outside and the inside of the housing to communicate with each other, thereby allowing air to flow.

  FIG. 2 shows another example of the ventilation member of the present invention. In this example, the cylindrical part 22 shown in FIG. 5B is inserted into the bottomed cylindrical cover part 41 shown in FIG. As shown in the figure, the ventilation member of this example is used by attaching the end of the tubular part 22 opposite to the side where the filter member 21 is attached to the opening 52 of the housing 51. The protruding portion 42 serves as a spacer, and a space is formed between the filter member 21 and the bottom surface of the cover component 41, which serves as a ventilation path, and the communication hole 23 formed in the thick portion of the cylindrical component 22 vents. It becomes a road. As indicated by an arrow 24 in FIG. 2, the outside and the inside of the casing communicate with each other through these ventilation paths, and air can be circulated.

  FIG. 3 shows still another example of the ventilation member of the present invention. In this example, the cylindrical part 32 shown in FIG. 6B is covered with the bottomed cylindrical cover part 61 shown in FIG. As shown in the figure, the ventilation member of this example is used by attaching the end of the tubular part 32 opposite to the side where the filter member 31 is attached to the opening 65 of the housing 64. Three protrusions 62 and protrusions 63 formed at equal intervals in the circumferential direction of the bottomed cylindrical cover part 61 serve as spacers, and are formed between the inner periphery of the cover part 61 and the outer periphery of the cylindrical part 32. A space serving as a ventilation portion is formed, and this is a ventilation path. As indicated by an arrow 35 in FIG. 3, the outside and the inside of the housing communicate with each other through this air passage, and air can be circulated.

  By covering the cylindrical part 12 having the filter member 11 attached to one end shown in FIG. 4B with the bottomed cylindrical cover part 41 shown in FIG. 7, the ventilation shown in FIG. A member was prepared. That is, first, a thermoplastic elastomer material (trade name Miralastomer 6030B manufactured by Mitsui Chemicals, Inc.) is extruded at a cylinder temperature of 160 to 220 ° C. and a die temperature of 200 ° C. using the die having the internal shape shown in FIG. Molded. The obtained cylindrical body was cut into a length of 12 mm by applying a rotary blade to obtain a cylindrical part 12. The obtained cylindrical part 12 had an inner diameter of 7 mm, a thickness excluding the protrusion 16 of 2 mm, and an outer diameter including the protrusion 16 of 17 mm.

Next, as a filter member 11, a laminate of a PTFE porous membrane having an outer diameter of 12 mm and a polyolefin-based nonwoven fabric (Nitto Denko Corporation trade name NTF1026-K02, PTFE porous membrane thickness 25 μm, average pore size 0.6 μm, A porosity of 85% and a polyolefin nonwoven fabric thickness of about 130 μm) were prepared. The filter member 11 is placed on one end of the tubular part 12 such that the polyolefin nonwoven fabric side is in contact with the tubular part 12, and the temperature is 190 ° C. and the pressure is 9.8 × 10 ⁴ Pa from the PTFE porous membrane side. And held for 10 seconds for heat fusion.

Next, the bottomed cylindrical cover part 41 was produced by injection molding using polypropylene resin (trade name UBE Polypro J815HK manufactured by Ube Industries). The obtained bottomed cylindrical cover part 41 had an inner diameter of 16 mm, an outer diameter of 18 mm, and a height of 10 mm. The bottomed cylindrical cover part 41 was covered with the cylindrical part 12 with the filter member 11 attached to the one end so as to cover the filter member 11 to obtain a ventilation member. As shown in FIG. 1, the ventilation member thus obtained was attached to a casing 43 having an inner volume of 50 cm ³ and having an opening 44 having an outer diameter of 8 mm, an inner diameter of 5 mm, and a height of 10 mm.

  The ventilation member shown in FIG. 1 was produced in the same manner as in Example 1 except that the filter member 11 was subjected to water / oil repellent treatment. That is, first, a solvent comprising 40 mole% of alkyl methacrylate and 60 mole% of perfluoroalkyl methacrylate, and 100 parts by weight of toluene, 39 parts by weight of n-heptane and 3.5 parts by weight of methyl acetate are uniformly mixed. Prepared. Subsequently, the copolymer was dissolved in the solvent to prepare a water / oil repellent treatment solution having a solid content of 5% by weight. The water / oil repellent treatment solution was applied to the filter member 11 and then dried at 120 ° C. for 3 minutes to give the filter member 11 a water / oil repellent treatment. When kerosene was dropped on the PTFE porous membrane side of the filter member 11 subjected to the water / oil repellent treatment, no permeation into the filter member was observed, and similarly, the filter member 11 not subjected to the water / oil repellent treatment. When kerosene was dropped onto the filter member, it penetrated into the filter member. A ventilation member was produced in the same manner as in Example 1 except that the filter member was subjected to water / oil repellent treatment in this way, and the produced ventilation member was attached to the housing in the same manner as in Example 1. .

  5 is covered with the cylindrical part 22 having the bottom end shown in FIG. 7 on the cylindrical part 22 whose one end shown in FIG. 5B is covered with the filter member 21. A member was prepared. That is, first, a thermoplastic elastomer material (trade name Santplane 101-73 manufactured by AES Co., Ltd.) is used, using a die having an internal shape shown in FIG. Extruded at 0 ° C. The obtained cylindrical body was cut into a length of 12 mm by applying a rotary blade to obtain a cylindrical part 22. The obtained cylindrical part 22 had an inner diameter of 7 mm, a wall thickness of 5 mm, an outer diameter of 17 mm, and an inner diameter of the communicating part 23 formed in the thick part was 2 mm.

  The filter member 21 was the same as the filter member 11 of Example 1. At one end of the cylindrical part 22, a double-sided tape (product name No. 500 manufactured by Nitto Denko Corporation) having an inner diameter of 7 mm and an outer diameter of 10 mm is provided so that the polyolefin nonwoven fabric side of the filter member 21 is in contact with the cylindrical part 22. Used and pasted.

Next, the bottomed cylindrical cover part 41 was produced by injection molding using a high-density polypropylene resin (trade name J110K manufactured by Chisso Corporation). The obtained bottomed cylindrical cover part 41 had an inner diameter of 16 mm, an outer diameter of 18 mm, and a height of 10 mm. The bottomed cylindrical cover component 41 was covered with the cylindrical component 22 with the filter member 21 attached to the one end so as to cover the filter member 21 to obtain a ventilation member. As shown in FIG. 2, the ventilation member thus obtained was attached to a housing 51 having an inner volume of 50 cm ³ and having an opening 52 having an outer diameter of 8 mm, an inner diameter of 5 mm, and a height of 10 mm.

  By covering the cylindrical part 32 having the filter member 31 attached to one end shown in FIG. 6B with the bottomed cylindrical cover part 61 shown in FIG. 8, the ventilation shown in FIG. A member was prepared. For this purpose, first, a thermoplastic elastomer material (trade name Miralastomer 6030B manufactured by Mitsui Chemicals Co., Ltd.) is used at a cylinder temperature of 160 to 220 ° C. and a die temperature of 200 ° C. using the die having the internal shape shown in FIG. Extruded. The obtained cylindrical body was cut into a length of 12 mm by applying a rotary blade to obtain a cylindrical part 32. The inner shape of the obtained cylindrical part 32 was a square with a side of 5 mm, and the meat outer diameter was 11 mm.

  Next, in the same manner as in Example 1, the filter member 31 was heat-sealed to one end portion of the tubular part 32. The same filter member 31 as that of the filter member 11 of Example 1 was used as the filter member 31.

Next, the bottomed cylindrical cover part 61 was produced by injection molding using a polypropylene resin (trade name UBE Polypro J815HK, manufactured by Ube Industries). The obtained bottomed cylindrical cover part 61 had an inner diameter of 16 mm, an inner diameter of the portion with the protrusion 62 was 10.5 mm, an outer diameter of 18 mm, and a height of 10 mm. The bottomed cylindrical cover part 61 was covered with the cylindrical part 32 with the filter member 31 attached to the one end so as to cover the filter member 31 to obtain a ventilation member. As shown in FIG. 3, the ventilation member thus obtained is a casing having an internal volume of 50 cm ³ in which the outer shape of the opening 65 is a square having a side of 5.5 mm and the inner shape is 2.5 mm on a side. 64.

  When the case where the ventilation member obtained in Examples 1 to 4 was attached to the case with water being applied at a rate of 1 liter / min for 5 minutes in a shower was examined for the presence or absence of water intrusion into the case, any example But no water intrusion was seen.

  The use of the ventilation member of the present invention is not particularly limited. For example, ECU (electronic control unit), lamps, motors, various sensors, pressure switches, actuators and other automotive electrical components, mobile phones, cameras, electric razors, electric By attaching to openings of various cases such as toothbrushes and lamps for outdoor use, it can be used as a ventilation member for a ventilation case.

It is sectional drawing which shows an example of the ventilation member of this invention. It is sectional drawing which shows the other example of the ventilation member of this invention. It is sectional drawing which shows the further another example of the ventilation member of this invention. FIG. 4A is a cross-sectional view showing an example of the internal shape of a die used in the present invention, and FIG. 4B is a schematic view showing an example of a cylindrical part manufactured using the die. . FIG. 5A is a cross-sectional view showing another example of the internal shape of the die used in the present invention, and FIG. 5B shows another example of a cylindrical part manufactured using the die. It is a schematic diagram. FIG. 6A is a cross-sectional view showing still another example of the internal shape of a die used in the present invention, and FIG. 6B is still another example of a cylindrical part manufactured using the die. It is a schematic diagram which shows. It is a schematic diagram which shows an example of the cover components in this invention. It is a schematic diagram which shows the other example of the cover components in this invention. It is sectional drawing which shows an example of the conventional ventilation member. It is sectional drawing which shows the other example of the conventional ventilation member.

Explanation of symbols

11, 21, 31 Filter member 12, 22, 32 Tubular component 13, 24, 33 Core 14, 25, 34 Internal shape of die 15 Protrusion 16, 62 Protrusion 17, 27, 35 Air flow 23 Communication portion 26 Communication Core for hole formation 41, 61 Cover component 42, 63 Abutting portion 43, 51, 64 Housing 44, 52, 65 Opening portion

Claims (8)

The end side of the cylindrical part with the filter member attached to one end is inserted into the bottomed cylindrical cover part, and between the inner periphery of the cylindrical part and the outer periphery of the cover part, A ventilation member manufacturing method in which a ventilation path is formed between the filter member and the bottom of the cover component, and the cylindrical component is formed by resin extrusion using a die having a core formed at the center thereof. The filter member is manufactured and attached to one end of the cylindrical part, and the filter member side of the cylindrical part is fitted into the bottomed cylindrical cover part so that the air passage is formed. Manufacturing method. On the inner wall of the die, a plurality of ridges extending in the extruding direction are formed in the circumferential direction, and the ridges extending in the axial direction are formed on the outer wall of the tubular part during the extrusion molding. The manufacturing method according to claim 1, wherein a plurality of the protrusions serve as spacers, and the air passage is formed between an outer periphery of the cylindrical part and an inner periphery of the cover part. In the die, in addition to the core formed at the center, one or more cores formed around the core are formed, and the core allows the cylindrical part to have a thickness within the thickness during the extrusion molding. A communication hole extending in the length direction is formed, and the filter member is attached to one end of the cylindrical part so as not to block the communication hole, and the outer periphery of the cylindrical part and the inner periphery of the cover part The manufacturing method according to claim 1, wherein the communication hole is replaced with a ventilation path, and the filter member side of the cylindrical part is fitted into the cover part so as not to block the communication hole. Method. One or more abutting portions are formed on the bottom surface of the bottomed cylindrical cover component, the abutting portion serves as a spacer, and an air passage is provided between the filter member and the bottom surface of the cover component. The manufacturing method according to claim 1, wherein a space is formed. The manufacturing method according to any one of claims 1 to 4, wherein the air permeability resistance (Gurley) of the filter member is 1000 seconds or less. The manufacturing method according to claim 1, wherein the air permeability resistance (Gurley) of the filter member is 100 seconds or less. The manufacturing method according to claim 1, wherein the filter member includes a polytetrafluoroethylene porous membrane. The manufacturing method according to claim 1, wherein the filter member is subjected to at least one of a water repellent treatment and an oil repellent treatment.

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