JP4574339B2 - Manufacturing method of ventilation member - Google Patents

Description

  The present invention relates to a method for manufacturing a ventilation member.

  Conventionally, various equipment such as automotive headlamps, rear lamps, fog lamps, turn lamps, motors, various pressure sensors, pressure switches and other automotive electrical components, mobile phones, cameras, electric razors, electric toothbrushes and outdoor use lamps The constituent members are used in a form housed in a casing.

  For example, casings are also frequently used in automobile parts. In recent years, securing a vehicle interior space has become a major issue. Conventionally, an electronic control unit for an automobile called an ECU (Electronic Control Unit), a CPU (Central Processing Unit), an electrical component installed in the vehicle interior. Etc. have been moved to the outside of the vehicle compartment of the automobile such as the engine room and the door panel. Unlike the case where the casing is installed outside the passenger compartment, the casing is hermetically sealed so as not to be affected by wind and rain, muddy water, oils, and the like.

Therefore, an opening is provided in a housing for storing an electronic control device for automobiles, etc., for the purpose of reducing the influence of pressure fluctuation due to a temperature difference caused by heat generation of the stored item or installation outside the vehicle compartment, and a ventilation member is provided in the opening Has been proposed (see Patent Document 1). According to this, it is possible to prevent water, dust, and the like from entering the inside of the housing, and it is possible to alleviate the pressure change in the housing due to temperature changes and to release the gas generated inside the housing.
JP 2001-168543 A

  For such a ventilation member, both improvement in manufacturing efficiency and improvement in reliability are required.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a method for manufacturing a ventilation member that has high manufacturing efficiency and is capable of improving reliability.

  In order to achieve the above object, the manufacturing method of the present invention is a method for manufacturing a ventilation member in which the ventilation holes of the reinforcement body having ventilation holes are covered with a ventilation filter, and the assembly of the reinforcement bodies is prepared. Then, each ventilation port of the assembly is covered with the ventilation filter to produce an assembly of a plurality of ventilation members, and this assembly is divided into ventilation members.

  In this way, in the manufacturing method of the present invention, a plurality of ventilation members are manufactured, and then the ventilation members are manufactured by dividing the assembly into the ventilation members. As a result, the working efficiency is improved and the manufacturing cost can be reduced. In addition, for example, when performing the characteristic inspection of the ventilation member at the time of manufacturing, as described later, if the characteristic inspection is performed on the aggregate of the plurality of ventilation members and then divided, the labor and cost for the inspection are reduced. Can be reduced. As a result, a highly reliable ventilation member can be provided at low cost. Moreover, since the ventilation member obtained by this invention has the ventilation filter attached to the reinforcement body, it is easy to handle and can be easily and reliably attached to the housing.

  In the manufacturing method of the present invention, as described above, the property inspection may be performed on the aggregate of the plurality of ventilation members, and then divided. Examples of the property inspection include dustproof, waterproof, and oilproof tests. Examples of the dust-proof property inspection method include methods such as JIS C 60068-2-68: 2002, IEC 60068-2-68 and JIS C 0920, IEC 60529, JIS F 0807, and other IP standards. Examples of the method for inspecting the waterproof property include, for example, a water resistance test method according to JIS L 1092 B method (high water pressure method), a water resistance test method according to JIS L 1092 A method (low water pressure method), and JIS C 0920, Methods such as IP standards such as IEC 60529 and JIS F 0807 can be mentioned. Examples of the method for inspecting oil-proof properties include a method of dripping or dipping various oils. In the manufacturing method of the present invention, the characteristic inspection includes reliability evaluation.

  In the manufacturing method of the present invention, each vent of the aggregate of reinforcing bodies may be covered with a separate vent filter or may be covered with a single vent filter.

  In the manufacturing method of the present invention, the aggregate of the reinforcing bodies may be an integrated product. Further, in the case where each vent of the aggregate of reinforcing bodies is covered with a single air filter, the aggregate of reinforcing bodies may be in a state of being separated for each of the reinforcing bodies.

  In the production method of the present invention, the material of the ventilation filter is not particularly limited. For example, a membrane material, a woven fabric, a nonwoven fabric, a blended nonwoven fabric, a felt, a net, a powder sintered porous body made of a synthetic resin porous body. And foams. Examples of the synthetic resin include polytetrafluoroethylene (PTFE), polyolefin resin (for example, polyethylene, polypropylene, etc.), and the like. The ventilation filter may be used as a single layer, or may be used by laminating two or more layers of the same or plural different materials. Moreover, it is preferable that at least a part of the ventilation filter is at least one of a PTFE porous body and a polyolefin resin porous body. For example, when the ventilation filter is a laminate, it is preferable that at least one layer of the laminate is at least one of a PTFE porous body and a polyolefin resin porous body.

  In the production method of the present invention, the porosity of the ventilation filter is, for example, in the range of 10 to 99%, preferably 50% from the viewpoint of eliminating the differential pressure inside and outside the casing to which the ventilation member is attached. It is -99% of range, More preferably, it is 80-99% of range. The porosity can be measured by, for example, a method of calculating from the weight of the ventilation filter and its density. Further, in the ventilation filter, in order to realize high collection efficiency and low pressure loss (high ventilation amount), the pore diameter is, for example, in the range of 0.01 to 10 μm, and the thickness thereof is, for example, 0.00. It is the range of 05-2 mm.

  In the production method of the present invention, the ventilation filter may be subjected to at least one of a water repellent treatment and an oil repellent treatment as necessary. The method of the water repellent treatment and the oil repellent treatment is not particularly limited, and examples thereof include a method of applying a commercially available water repellent treatment agent and oil repellent treatment agent, drying, and curing.

  In the production method of the present invention, the material of the reinforcing body is not particularly limited and may be either a natural material or a synthetic material. However, when heat resistance is desired, for example, polyester resin, polyamide resin, aramid resin, polyimide It is preferably formed from a resin, a fluororesin, an ultrahigh molecular weight polyethylene resin, a metal or the like. The shape and size of the reinforcing body and the shape, size, and number of the vents are not particularly limited, and can be arbitrarily set according to the use state of the ventilation member.

  In the production method of the present invention, the method of attaching the ventilation filter to each ventilation port of the assembly of the reinforcing bodies is not particularly limited. For example, depending on the method such as adhesion and adhesion, and depending on the material, thermal welding, In the case where welding such as sonic welding or the assembly of the reinforcing bodies can be injection-molded, an integral molding method in which a ventilation filter is attached at the same time as the assembly of the reinforcing bodies is included.

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

  An example of the first manufacturing method is an example in which the aggregate of the reinforcing bodies is an integrated product, and each vent of the aggregate of reinforcing bodies is covered with a separate ventilation filter. The steps of the manufacturing method of this example will be described with reference to FIG.

  First, an assembly of the reinforcing bodies as an integrated product is prepared. FIG. 1A shows an example of an assembly of the reinforcing bodies as an integrated product. FIG. 1A-1 is a plan view thereof, and FIG. 1A-2 is a cross-sectional view taken along line X-X ′ of FIG. As shown in the figure, the aggregate of the reinforcing bodies 11 of the integrated body is a quadrangular plate shape, and four reinforcing bodies 11 are positioned in two rows in the vertical and horizontal directions, and a circular ventilation hole is provided at the substantially central portion of each reinforcing body 11. 12 is formed, and a cross-shaped groove is carved between the four reinforcing bodies 11.

  Next, as shown in FIG. 1B, each of the vents 12 of the aggregate of the reinforcing bodies 11 as an integrated product is covered with a separate circular ventilation filter 13 to produce an aggregate of four ventilation members. To do. FIG. 1B-1 is a plan view thereof, and FIG. 1B-2 is a cross-sectional view taken along line X-X ′ of FIG. The diameter of the ventilation filter 13 is set to be slightly larger than the diameter of the ventilation hole 12.

  Next, as shown in FIG. 1C, the four ventilation members can be obtained by dividing the aggregate of the four ventilation members for each ventilation member along the cross-shaped groove. 1C-1 is a plan view thereof, and FIG. 1C-2 is a cross-sectional view taken along line X-X ′ of FIG. The dividing method is not particularly limited, and for example, it is performed by cutting with a blade, laser cutting, fusing, or the like.

  In the first example, when the characteristic inspection of the ventilation member is performed, the characteristic inspection is performed on the assembly of the four ventilation members illustrated in FIG. 1B, and thereafter, as illustrated in FIG. It is preferable to divide into two.

  Next, an example of the second manufacturing method is an example in which the aggregate of the reinforcing bodies is an integrated product, and each ventilation port of the aggregate of the reinforcing bodies is covered with a single ventilation filter. The steps of the manufacturing method of this example will be described with reference to FIG.

  First, in the same manner as in the first example, an assembly of the reinforcing bodies as an integrated product is prepared. FIG. 2A shows an example of an assembly of the reinforcing bodies as an integrated product. This aggregate is the same as in the first example.

Next, as shown in FIG. 2 (B), each of the vents 12 of the aggregate of the reinforcing bodies 11 as an integrated product is covered with a single square ventilation filter 14 to produce an aggregate of four ventilation members. To do. FIG. 2B-1 is a plan view thereof, and FIG. 2B-2 is a cross-sectional view taken along line X-X ′ of FIG. The size of the ventilation filter 14 is set to be slightly smaller than the aggregate of the reinforcing bodies 11 as an integrated product, but may be set to be equal to or larger than the aggregate of the reinforcing bodies 11 as an integrated product.

  Next, as shown in FIG. 2C, the four ventilation members can be obtained by dividing the assembly of the four ventilation members for each ventilation member along the cross-shaped groove. FIG. 2C-1 is a plan view thereof, and FIG. 2C-2 is a cross-sectional view taken along line X-X ′ of FIG. The dividing method is not particularly limited, and for example, it is performed in the same manner as in the first example.

  In the second example, as in the first example, when the characteristic inspection of the ventilation member is performed, the characteristic inspection is performed on the assembly of the four ventilation members shown in FIG. It is preferable to divide as shown in FIG.

  Next, an example of the third manufacturing method is a state in which the aggregate of the reinforcing bodies is separated for each of the reinforcing bodies, and each ventilation port of the aggregate of the reinforcing bodies is formed with a single ventilation filter. It is an example in the case of covering. The steps of the manufacturing method of this example will be described with reference to FIG.

  First, an assembly of the reinforcing bodies in a state of being separated for each reinforcing body is prepared. FIG. 3A shows an example of an assembly of the reinforcing bodies in a state separated for each reinforcing body. FIG. 3A-1 is a plan view thereof, and FIG. 3A-2 is a cross-sectional view taken along line X-X ′ of FIG. As shown in the drawing, four rectangular plate-like reinforcing bodies 21 having circular vents 22 in the substantially central portion are arranged in two rows vertically and horizontally with a gap therebetween to form an aggregate.

  Next, as shown in FIG. 3B, each ventilation port 22 of the aggregate of the reinforcing bodies 21 in a state separated for each reinforcing body 21 is covered with one rectangular ventilation filter 14 to provide four ventilation holes. An assembly of members is manufactured. FIG. 3B-1 is a plan view thereof, and FIG. 3B-2 is a cross-sectional view taken along line X-X ′ of FIG.

  Next, as shown in FIG. 3C, the four ventilation members are obtained by dividing the aggregate of the four ventilation members for each ventilation member at a gap portion between the reinforcing bodies 21. Can do. 3C-1 is a plan view thereof, and FIG. 3C-2 is a cross-sectional view taken along line X-X ′ of FIG. The dividing method is not particularly limited, and for example, it is performed in the same manner as in the first example.

  In the third example, as in the first example, when the characteristic inspection of the ventilation member is performed, the characteristic inspection is performed on the assembly of the four ventilation members shown in FIG. It is preferable to divide as shown in FIG.

  Next, examples of the present invention will be described.

  A ventilation member was manufactured by the process shown in the first example. That is, first, an assembly of integrated reinforcing bodies having the shape shown in FIG. 1A was produced by injection molding using polybutylene terephthalate resin (manufactured by Teijin, trade name CG7640, melting point 225 ° C.). In this example, the size of the aggregate of the reinforcing bodies 11 of the integrated body is 105 mm × 105 mm and the thickness is 3 mm. As shown in the figure, a cross-shaped cross section having a width of 5 mm and a depth of 2 mm is provided between the four reinforcing bodies 11. A groove was formed. Moreover, the diameter of the circular vent 12 was 20 mm.

  Next, a PTFE porous body (manufactured by Nitto Denko Corporation, trade name: Microtex NTF1131, melting point: 327 ° C.) and a non-woven fabric having a thickness of 0.15 mm (made by Toray Industries, trade name: ACSTER G-2070-1, surface layer melting point: 260 ° C.) Lamination was performed to produce a laminate, which was subjected to water and oil repellency treatments. That is, first, a copolymer composed of 40 mol% alkyl methacrylate and 60 mol% perfluoroalkyl methacrylate, and a solvent in which 39 parts by weight of n-heptane and 3.5 parts by weight of methyl acetate were uniformly mixed with 100 parts by weight of toluene. Got ready. Next, the copolymer was dissolved in this solvent to prepare a water / oil repellent solution having a solid content of 5% by weight. Next, this water / oil repellent solution was applied to the surface of the laminate on the PTFE porous body side, dried at 80 ° C. for 10 minutes, and then cured at 180 ° C. for 3 minutes. The thickness of the obtained laminate subjected to the water / oil repellent treatment was 0.085 mm. This was punched out into a circular shape with a diameter of 25 mm to obtain four circular ventilation filters 13 subjected to water / oil repellent treatment.

Next, as shown in FIG. 1 (B), the four circular ventilation filters 13 are respectively aligned with the four ventilation holes 12 of the assembly of the reinforcing bodies 11 that are integrated, and the ventilation holes 12 are arranged. The 2 mm wide portion of the rim was pressure-bonded at a temperature of 260 ° C. and a pressure of 4.9 × 10 ⁵ Pa for 30 seconds, so that four ventilation filters 13 were simultaneously heat-sealed to obtain an assembly of four ventilation members.

  Next, as a waterproof characteristic test, a water resistance test of the assembly of the four ventilation members is performed according to JIS L 1092 B method (high water pressure method), and the water resistance decreases due to breakage of the ventilation filter 13 or the like. Confirmed not.

  After confirming the reliability of the assembly of the four ventilation members by the above method, as shown in FIG. 1 (C), the assembly is cut along the cross-shaped groove by cutting with a blade. By dividing into four parts, four ventilation members were obtained.

  A ventilation member was manufactured by the process shown in the second example. That is, first, in the same manner as in Example 1, an aggregate of integrated reinforcing bodies having the shape shown in FIG. This aggregate is the same as that in Example 1.

  Next, in the same manner as in Example 1, a laminated body subjected to water and oil repellency treatment was obtained. The obtained laminate was punched into a square shape with a length of 100 mm and a width of 100 mm to obtain a square ventilation filter 14 subjected to water / oil repellent treatment.

Next, as shown in FIG. 2 (B), the square ventilation filter 14 is arranged so as to cover all four ventilation holes 12 of the aggregate of the reinforcing bodies 11 as an integrated object, and each ventilation hole 12 is covered. The air filter 14 is simultaneously heat-welded to the four vent holes 12 by press-bonding the edge portion of 2 mm width at a temperature of 260 ° C. and a pressure of 4.9 × 10 ⁵ Pa for 30 seconds to obtain an assembly of four vent members. It was.

  Next, as a waterproof characteristic test, a water resistance test of the assembly of the four ventilation members is performed according to the JIS L 1092 B method (high water pressure method), and the water resistance decreases due to breakage of the ventilation filter 14 or the like. Confirmed not.

  After confirming the reliability of the assembly of the four ventilation members by the above method, as shown in FIG. 2 (C), the assembly is vented along the cross-shaped groove in the same manner as in Example 1. By dividing each member, four ventilation members were obtained.

  A ventilation member was manufactured by the process shown in the third example. That is, first, as shown in FIG. 3 (A), an assembly of reinforcing bodies in a state of being separated for each reinforcing body was prepared. Four rectangular plate-like reinforcing bodies 21 having a circular vent 22 at a substantially central portion were produced by injection molding using polybutylene terephthalate resin (manufactured by Teijin, trade name CG7640, melting point 225 ° C.). In this example, the size of the reinforcing body 21 is 50 mm × 50 mm, the thickness is 3 mm, and the diameter of the vent 22 is 20 mm. Subsequently, the four rectangular plate-shaped reinforcing bodies 21 were arranged in two rows in the vertical and horizontal directions with a gap therebetween to form an aggregate. The width of the gap between the reinforcing bodies 21 was 5 mm.

  Next, in the same manner as in Example 2, a square ventilation filter 14 subjected to water / oil repellent treatment was obtained.

Next, as shown in FIG. 3 (B), the square ventilation filter 14 is fitted so as to cover all four vent holes 22 of the aggregate of the reinforcing bodies 21 in a state separated for each reinforcing body 21. The air filter 14 was simultaneously heat welded to the four air vents 22 by press-bonding the edge 2 mm width portions of the respective air vents 22 at a temperature of 260 ° C. and a pressure of 4.9 × 10 ⁵ Pa for 30 seconds. An assembly of members was obtained.

  Next, as a waterproof characteristic test, a water resistance test of the assembly of the four ventilation members is performed according to the JIS L 1092 B method (high water pressure method), and the water resistance decreases due to breakage of the ventilation filter 14 or the like. Confirmed not.

  After confirming the reliability of the assembly of the four ventilation members by the above method, as shown in FIG. 3 (C), the assembly is ventilated at the gap portions between the vent holes 21 by cutting with a blade. By dividing each member, four ventilation members were obtained.

  With the above method, a highly reliable ventilation member could be obtained at low cost.

  According to the manufacturing method of the present invention, a ventilation member can be obtained with good work efficiency and at low cost. The use of the ventilation member manufactured by the manufacturing method of the present invention is not particularly limited. For example, automotive electrical components such as automotive headlamps, rear lamps, fog lamps, turn lamps, motors, various pressure sensors, and pressure switches, It can be used for housings of various devices such as mobile phones, cameras, electric razors, electric toothbrushes, and lamps for outdoor use.

It is process drawing which shows an example of the process of the manufacturing method of this invention. It is process drawing which shows the other example of the process of the manufacturing method of this invention. It is process drawing which shows the further another example of the process of the manufacturing method of this invention.

Explanation of symbols

11 21 Reinforcing body 12, 22 Ventilation hole 13, 14 Ventilation filter

Claims (5)

A ventilation member manufacturing method in which the ventilation hole of the reinforcement body for ventilation filter having a ventilation hole is covered with a ventilation filter, and preparing an assembly of the reinforcement bodies separated for each reinforcement body, A manufacturing method of manufacturing an aggregate of a plurality of ventilation members by covering each ventilation port of the aggregate with one ventilation filter, and dividing the aggregate for each ventilation member. Perform a property test on the assembly of the plurality of ventilation members, and then divide ,
The manufacturing method according to claim 1 , wherein the characteristic inspection is a dustproof, waterproof or oilproof test . The production method according to claim 1, wherein at least part of the ventilation filter is at least one of a polytetrafluoroethylene porous body and a polyolefin resin porous body. The manufacturing method according to any one of claims 1 to 3 , wherein a porosity of the ventilation filter is in a range of 10 to 99%. The manufacturing method according to any one of claims 1 to 4 , wherein the ventilation filter is subjected to at least one of a water repellent treatment and an oil repellent treatment.

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