Resin molded product with ventilation part

Abstract

To provide a resin molded product with a ventilation part which can be manufactured relatively easily even if ventilation holes in which ventilation films are provided have small diameters and are densely arranged.SOLUTION: A resin molded product 11 with a ventilation part of the present invention is one in which a ventilation part B1 including a plurality of densely arranged ventilation holes 14 is provided in a part of a molded product body 12 which is an injection molded product. The resin molded product 11 has a ventilation film 41. An area surrounding a formation site of the plurality of ventilation holes 14 is defined as a ventilation hole formation area R1. The ventilation film 41 has an outer shape larger than the ventilation hole formation area R1, and has numerous fine ventilation structures therein. By providing the ventilation film 41 in the molded product body 12, the plurality of ventilation holes 14 are collectively blocked so as to be ventilated.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a resin molded product with a ventilation portion, and more particularly to a resin molded product in which a ventilation portion including a ventilation hole is provided in a part of a molded product body formed by injection molding. [Background technology]

[0002] Conventionally, for example, case-shaped resin molded products for housing various electric and electronic devices are generally manufactured by injection molding of resin. Some of these types of resin molded products may have a vent portion that communicates between the inside and outside of the molded product. Usually, the vent portion includes a vent hole, and the vent hole may be blocked by providing a vent membrane. The vent membrane is bonded to the outer periphery of the vent hole. The vent membrane has a countless number of fine vent structures that are finer than liquid molecules, so that it allows the passage of gas but does not allow the passage of moisture or the like. Several resin molded products having a structure that allows ventilation through the vent portion have been proposed (see, for example, Patent Documents 1 and 2).

[0003] In recent years, various resin molded products have become smaller, and there is a demand to make ventilation parts (vent holes, ventilation membranes, etc.) smaller to accommodate the miniaturization. An example of such a case is a flow path plate. A flow path plate is a resin molded product having a flow path through which liquid can flow, and has a small-diameter ventilation hole formed so as to communicate with part of the flow path. There is a demand to bond a ventilation membrane to the outer periphery of this ventilation hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-347068 A [Patent Document 2] JP 2005-231276 A Summary of the Invention [Problem to be solved by the invention]

[0005] By the way, in the case of resin molded products such as flow channel plates, it is necessary to form the vent holes much smaller than in conventional products, for example, with a diameter of 1 mm or less. In addition, it is also necessary to form multiple such small vent holes in a closely packed state.

[0006] In this case, in order to bond the ventilation membrane to the outer periphery of the ventilation hole, multiple ventilation membranes with extremely small areas must be prepared to match the size of each ventilation hole, and they must be accurately positioned relative to each small-diameter ventilation hole, which is impossible to produce. Therefore, it has been difficult to manufacture a resin molded product with the above structure.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a resin molded product with a ventilation part that can be manufactured relatively easily even if the ventilation holes through which the ventilation membrane is provided are small in diameter and closely spaced. [Means for solving the problem]

[0008] In order to solve the above problems, the invention described in Means 1 is a resin molded product having a ventilation part including a plurality of closely spaced air holes provided in a part of the molded product body which is an injection molded product, and is characterized in that when the area surrounding the formation site of the plurality of air holes is defined as the air hole formation area, the resin molded product with a ventilation part is provided with an air permeable membrane having countless fine air structures therein, and the air permeable membrane is provided in the molded product body, so that the plurality of air holes are collectively blocked to allow ventilation.

[0009] Therefore, according to the invention described in Means 1, even if the vent holes to which the vent film is provided are small in diameter and densely arranged, by using a vent film having an outer shape larger than the vent hole formation area and providing the vent film on the molded article body, it is possible to block a plurality of vent holes at once. Therefore, it is possible to relatively easily manufacture a resin molded article with a vent.

[0010] The invention described in Means 2 is based on Means 1, in which the molded product body is provided with a resin cover that covers the ventilation portion, an opening having an outer shape large enough to surround the ventilation hole formation area is formed in the cover, and the ventilation membrane having an outer shape larger than the opening is joined to the outer periphery of the opening.

[0011] Therefore, according to the invention described in Means 2, it is only necessary to join the ventilation film having an outer shape larger than the opening to the cover side having the opening larger than the multiple ventilation holes, not to the molded article main body side having the multiple ventilation holes, which makes it easier to manufacture the resin molded article.

[0012] The invention described in Means 3 is characterized in that, in Means 2, the resin molded product has a structure in which the cover is provided on at least one side of the resin plate body which is the molded product main body, and is a flow path plate in which a flow path is formed in the plate body, and the multiple air holes are formed in the plate body so as to communicate with the flow path.

[0013] Therefore, according to the invention described in Means 3, gas generated from the liquid flowing through the flow path and gas present in the flow path are allowed to pass through the ventilation part, while liquid is not allowed to pass through.

[0014] The invention described in Means 4 is characterized in that in Means 3, the multiple air vents are arranged in a row, the opening is an opening groove extending along the arrangement direction of the multiple air vents, and the air permeable membrane has an outer shape larger than the opening and has an elongated shape in a planar view.

[0015] Therefore, according to the invention as recited in Means 4, a plurality of ventilation holes arranged in a row can be efficiently covered with the ventilation film.

[0016] The invention described in means 5 is characterized in that in means 4, the breathable membrane has long sides and short sides, and the short sides are formed in a round shape in a plan view.

[0017] Therefore, according to the invention described in Means 5, the gas permeable membrane is less likely to warp, making it easier to handle and more likely to be firmly attached to the outer periphery of the opening groove. In addition, after the gas permeable membrane is attached, it is possible to make it difficult for the gas permeable membrane to peel off from the opening groove.

[0018] The invention described in Means 6 is characterized in that, in any one of Means 2 to 5, the outer peripheral portion of the opening in the cover is a solidified product of molten resin produced by injection molding, and the ventilation membrane is joined to the outer peripheral portion by a part of the molten resin in the outer peripheral portion penetrating into the countless fine ventilation structures of the ventilation membrane.

[0019] Therefore, according to the invention described in Means 6, an anchoring effect is obtained by a part of the molten resin penetrating into the fine ventilation structure, so that the ventilation membrane can be firmly bonded to the outer periphery. Effect of the Invention

[0020] As described above in detail, according to the inventions described in claims 1 to 6, it is possible to provide a resin molded product with a ventilation portion that can be manufactured relatively easily even if the ventilation holes in which the ventilation membrane is provided are small in diameter and closely spaced. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a schematic perspective view showing a flow path plate according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic exploded perspective view showing the flow channel plate of FIG. 1. [Diagram 3] FIG. 4 is a perspective view of a cover of a flow path plate viewed from the bottom side. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 2 is a cross-sectional view of the flow channel plate taken along line AA in FIG. 1. [Figure 8] FIG. 2 is a cross-sectional view of the flow path plate (before the cover is attached) taken along line BB in FIG. 1 . [Figure 9] FIG. 2 is a cross-sectional view of the flow path plate (after the cover is attached) taken along line BB in FIG. 1. [Figure 10] FIG. 4 is a schematic cross-sectional view showing the bonding state of the breathable membrane. [Figure 11] FIG. 11 is a partial cross-sectional view showing a flow path plate according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, a flow path plate 11 according to an embodiment of the resin molded product with a ventilation part of the present invention will be described in detail with reference to Figs. 1 to 10. As shown in Figs. 1 and 2, the flow path plate 11 according to this embodiment is a rectangular flat resin molded product formed by stacking a plurality of plate members and having a flow path 15 (see Fig. 8) therein. The dimensions of each part of the flow path plate 11 are not particularly limited and may be any. For example, in this embodiment, the vertical dimension is about 50 mm, the horizontal dimension is about 30 mm, and the height dimension is about 5 mm. This flow path plate 11 is composed of a plate body 12, an upper plate 21, a lower plate 22, a cover 31, and a ventilation membrane 41.

[0023] The plate body 12 (molded product body) is a resin member that constitutes the main part of the flow path plate 11, and has a rectangular shape in a plan view. A plurality of very fine flow paths 15, each having a width of, for example, 1 mm or less, are formed in almost the entire area of ​​the plate body 12. In FIG. 2, the area in which the flow paths 15 are formed is shown generally by being given the member number 13. As shown in FIG. 8 and FIG. 9, the flow paths 15 are configured to include an upper surface side flow path 15a, a lower surface side flow path 15b, and a connection flow path 15c. The upper surface side flow path 15a is formed so as to extend along the surface direction on the upper surface side of the plate body 12. The lower surface side flow path 15b is formed so as to extend along the surface direction on the lower surface side of the plate body 12. The connection flow path 15c is formed so as to penetrate the plate body 12 in the thickness direction and connect the upper surface side flow path 15a and the lower surface side flow path 15b. These flow paths 15 are capable of flowing fluids (various liquids and gases). The multiple flow paths 15 may have branching parts or junction parts (not shown) at multiple locations.

[0024] As shown in FIG. 2 and FIG. 7, a ventilation part B1 is provided at one end of the plate body 12. The ventilation part B1 is a part that communicates the inside and outside of the flow path plate 11, and more specifically, is a part that does not discharge the liquid inside the flow path plate 11, but discharges only the generated gas and the gas present in the flow path to the outside. The ventilation part B1 includes a plurality of ventilation holes 14 arranged closely together. The plurality of ventilation holes 14 are through holes with a circular cross section formed so as to penetrate the plate body 12 in the thickness direction. As shown in FIG. 8 and FIG. 9, the lower end side of the plurality of ventilation holes 14 is connected to the end of the lower surface side flow path 15b, respectively. Therefore, the fluid flowing on the flow path 15 side can flow into the plurality of ventilation holes 14 side.

[0025] As shown in Figs. 1, 2 and 7, the multiple ventilation holes 14 are arranged in a row, and in this embodiment, a total of six ventilation holes 14 are arranged in a row (straight line) parallel to the short side of the plate body 12. The diameter of the ventilation holes 14 is 1 mm or less, and the distance between adjacent ventilation holes 14 is less than 3 mm. In other words, the multiple ventilation holes 14 have an extremely small diameter, and the ventilation membrane 41 of the corresponding size is difficult to grasp with fingers or a jig, and they are arranged so densely in the plate body 12 that the ventilation membranes 41 overlap and cannot be joined. Here, a substantially rectangular area surrounding the formation site of the multiple ventilation holes 14 is defined as the ventilation hole formation area R1. In Fig. 2, the ventilation hole formation area R1 is indicated by a dashed line.

[0026] As shown in Figs. 1, 2, and 7 to 9, an upper plate 21 is joined to the upper surface side of the plate body 12 by adhesion, welding, or the like. The upper plate 21 is a resin member having a rectangular shape in a plan view and a size that is about 2 / 3 of the size of the plate body 12, and is provided so as to cover the portion where the upper surface side flow path 15a is formed. Meanwhile, a lower plate 22 is joined to the lower surface side of the plate body 12 by adhesion, welding, or the like. The lower plate 22 is a resin member having a rectangular shape in a plan view and the same size as the plate body 12, and is provided so as to cover the portion where the lower surface side flow path 15b and the lower openings of the multiple air holes 14 are formed.

[0027] 1, 2, and 7 to 9, a cover 31 is joined by adhesion, welding, or the like to the upper surface side of the plate body 12 at a position immediately beside the upper plate 21. The cover 31 is a resin member for covering the ventilation portion B1 formed in the plate body 12, and is an injection molded product formed into a rectangular shape in a plan view. The dimensions of the cover 31 are not particularly limited and can be set arbitrarily, but in this embodiment, for example, the vertical dimension is about 30 mm and the horizontal dimension is about 10 mm.

[0028] Basically, any type of resin can be used for the injection molding of the cover 31, so long as it is a thermoplastic resin or a thermosetting resin that melts into a liquid state when heated. Specific examples of the resin that can be used include thermoplastic resins such as ABS (acrylonitrile butadiene styrene) resin, AES (acrylonitrile ethylene propylene rubber styrene) resin, PVC (polyvinyl chloride) resin, PP (polypropylene) resin, PE (polyethylene) resin, PA (polyamide) resin, PPS (polyphenylene sulfide) resin, PBT (polybutylene terephthalate) resin, and POM (polyacetal) resin. The above-mentioned thermoplastic resins can also be used for the plate-like members (plate body 12, upper plate 21, and lower plate 22) other than the cover 31 in the flow path plate 11.

[0029] As shown in Figs. 3 to 6, an opening groove 32 (opening) is formed in the center of the cover 31. In this embodiment, the opening groove 32 extends along the arrangement direction A1 of the plurality of ventilation holes 14 (see Fig. 6, etc.). The opening groove 32 is formed to communicate between the front side 33a and the back side 33b of the cover 31. The opening groove 32 is formed to have an outer shape (an outer shape of a size that can surround the ventilation hole formation region R1) that is equal to or larger than the above-mentioned ventilation hole formation region R1. An outer annular convex portion 34 that protrudes from the back side 33b is formed on the outer periphery of the back side 33b of the cover 31. An annular recess 35 recessed toward the front side 33a is formed in the inner region of the convex portion 34. An inner annular convex portion 36 is formed on the opening edge (i.e., the outer periphery of the opening) of the opening groove 32 on the back side 33b of the cover 31. The outer annular protrusion 34 protrudes slightly higher than the inner annular protrusion 36, and is joined to the upper surface of the plate body 12. When the cover 31 is joined to the upper surface of the plate body 12, the multiple air holes 14 are disposed inside the opening groove 32 (see FIG. 6).

[0030] As shown in Figs. 3 to 8, the cover 31 is provided with a breathable membrane 41. The cover 31 is molded by setting the breathable membrane 41 in an injection mold and injecting a material (molten resin) for molding the cover 31 into the injection mold, thereby bonding the breathable membrane 41. The breathable membrane 41 constitutes a part of the ventilation part B1. The breathable membrane 41 of this embodiment is a thin sheet-like material having a thickness of 0.5 mm or less and having numerous fine breathable structures inside, and has a structure in which a backing sheet 43 is laminated on both sides of a sheet body 42 by pressure bonding or the like, as shown in Fig. 10. As the sheet body 42, a commercially available product such as "Gore-Tex (registered trademark)" of WL Gore Inc. of the United States and "Microtex" of Nitto Denko Corporation can be used. The sheet body 42 is made of polytetrafluoroethylene resin, and is relatively easily available in a thickness of about 50 μm to 200 μm, but is not limited to this thickness range.

[0031] The sheet body 42 has a sponge-like structure, and when observed microscopically, it has numerous irregularly shaped micropores 45 of about 0.05 μm to 20 μm inside. Therefore, the sheet body 42 allows the passage of substances according to their size. Specifically, the sheet body 42 allows the passage of atmospheric moisture, water vapor, and gases smaller than this, which are 0.0004 μm in size. However, the sheet body 42 does not allow the passage of liquids such as water droplets that are 100 μm or larger in size.

[0032] Examples of materials for the backing sheet 43 laminated to the sheet body 42 include cloth and nonwoven fabric made of fibers of various resins such as polyamide, polyester, and polyolefin. Cloth and nonwoven fabric made of this type of fiber are preferable because they do not corrode and do not dissolve or deteriorate even when they come into contact with water. Inside this backing sheet 43, countless irregularly shaped breathable voids 44 are formed.

[0033] As shown in Figs. 2 to 6, the gas permeable membrane 41 has an outer shape larger than the vent hole forming region R1 and the opening 32, and in this embodiment, it has an elongated oval shape in plan view. In other words, the gas permeable membrane 41 in this embodiment has long sides and short sides, and the short sides are formed in a round shape in plan view. The outer shape of the gas permeable membrane 41 is equal to the outer shape of the inner annular convex portion 36 formed on the back side 33b of the cover 31. The outer periphery of the gas permeable membrane 41 is joined to the lower surface of the inner annular convex portion 36. When the outer annular convex portion 34 of the cover 31 is joined to the upper surface of the plate body 12, the gas permeable membrane 41 covers and closes the upper openings 14a of the multiple vent holes 14 (see Figs. 6 and 7). That is, by placing the cover 31 provided with the gas permeable membrane 41 on the upper surface of the plate body 12, the multiple vent holes 14 are collectively closed by the gas permeable membrane 41 in a breathable manner.

[0034] The breathable membrane 41 is bonded to the inner annular convex portion 36 of the cover 31 mainly by mechanical fastening, and FIG. 10 shows a schematic state of the bonded region shown by the circle C1 in FIG. 8. In FIG. 10, the fine pores 45 of the sheet body 42 are shown in a simplified manner to distinguish them from the backing sheet 43 and to make them easier to illustrate, but in reality, they are formed in an irregular direction. It can be said that the outer peripheral portion of the opening in the cover 31 (specifically, the inner annular convex portion 36) is a solidified product of the molten resin by injection molding. As described above, the lower surface of the inner annular convex portion 36 is disposed in contact with the outer peripheral portion of the breathable membrane 41. Then, a part of the molten resin in that portion penetrates into the countless fine ventilation structures (the breathable gaps 44 and the fine pores 45) of the breathable membrane 41 and solidifies, thereby obtaining an anchoring effect. Due to this anchoring effect, the breathable membrane 41 is firmly bonded to the outer peripheral portion of the opening. 10 shows the state in which the resin has entered the fine ventilation structure of the ventilation film 41 (see resin intrusion portion 46). The molten resin from the inner annular protrusion 36 is forced into the fine ventilation structure by the action of the resin injection pressure and filling pressure during the injection molding of the cover 31. Such intrusion of the resin not only improves the joining strength (adhesive strength) of the ventilation film 41 to the cover 31, but also contributes to improving the sealing performance at the joining portion.

[0035] According to this embodiment, the following effects can be obtained.

[0036] (1) In the flow channel plate 11 of this embodiment, a ventilation part B1 including a plurality of closely arranged ventilation holes 14 is provided in a part of the plate body 12. The plate body 12 is provided with a ventilation membrane 41 having an outer shape larger than the ventilation hole forming region R1 surrounding the plurality of ventilation holes 14 and having a countless number of fine ventilation structures therein. Therefore, even if the plurality of ventilation holes 14 have small diameters and are closely arranged, they can be blocked collectively by using the above ventilation membrane 41. Therefore, it becomes possible to manufacture the flow channel plate 11 with the ventilation part B1 relatively easily.

[0037] Conventionally, in manufacturing a resin molded product such as the flow path plate 11, in order to integrally mold the ventilation film 41 on the outer periphery of the ventilation hole 14, it was necessary to prepare a plurality of extremely small ventilation films 41 in accordance with the size of each ventilation hole 14 and to accurately arrange them with respect to each small-diameter ventilation hole 14. Specifically, in this embodiment, it was necessary to prepare six ventilation films 41 in order to block six ventilation holes 14. In addition, since the diameter of each ventilation hole 14 is 1 mm or less, the diameter of the ventilation film 41 had to be about 3 mm. However, the task of accurately arranging such extremely small-area ventilation films 41 with respect to each small-diameter ventilation hole 14 is very complicated and difficult, and significantly reduces productivity. Therefore, it was extremely difficult to manufacture a resin molded product with the above structure. In contrast, according to this embodiment, there is a great advantage in that it is not necessary to handle multiple breathable membranes 41 with a diameter of about 3 mm, but rather it is necessary to handle only one breathable membrane 41 that is larger than that (for example, a length of just under 30 mm and a width of several mm). This contributes to facilitating the manufacture of the flow path plate 11 with the breathable portion B1.

[0038] (2) In the case of the flow passage plate 11 of this embodiment, the plate body 12 is provided with a resin cover 31 that covers the ventilation portion B1. The cover 31 is formed with an opening groove 32 having an outer shape large enough to surround the ventilation hole formation region R1. The inner annular protrusion 36 on the outer periphery of the opening groove 32 is joined with a ventilation membrane 41 having an outer shape larger than the opening groove 32. That is, in this embodiment, the ventilation membrane 41 is joined not to the plate body 12 side but to the cover 31 side on which the opening groove 32 is formed, and the ventilation membrane 41 is indirectly attached to the plate body 12 via the cover 31. In this structure, it is sufficient to join the ventilation membrane 41 having an outer shape larger than the opening groove 32 to the cover 31 side on which the opening groove 32 larger than the multiple ventilation holes 14 is formed. Therefore, compared to a structure in which the ventilation membrane 41 is directly attached to the plate body 12, there are advantages such as a smaller burden on the positioning of the ventilation membrane 41, and an easier securing of a sufficient width of the joining margin. Therefore, the flow path plate 11 can be manufactured more easily.

[0039] (3) In the flow path plate 11 of this embodiment, a plurality of flow paths 15 are formed in the plate body 12, and the ends of the flow paths 15 are connected to a plurality of ventilation holes 14. Therefore, with this configuration, gas generated from the liquid flowing through the flow paths 15 and gas present within the flow paths 15 can be discharged to the outside of the device through the ventilation part B1 including the ventilation membrane 41. On the other hand, the liquid flowing through the flow paths 15 can be retained within the device without being discharged. Furthermore, it is possible to prevent liquid from entering from the outside of the device through the ventilation membrane 41.

[0040] (4) In the case of the flow path plate 11 of this embodiment, the plurality of ventilation holes 14 are arranged in a row. The opening is an opening groove 32 extending along the arrangement direction of the plurality of ventilation holes 14. In consideration of the shape of the elongated opening groove 32, the ventilation film 41 has an outer shape larger than the opening groove 32 and has an elongated shape in a plan view. In addition, the ventilation film 41 has long sides and short sides, and the short side is formed in a round shape in a plan view. For example, if there is a corner on the short side of the ventilation film 41, warping is likely to occur especially at the corner when the ventilation film 41 is set in an injection molding die for injection molding the cover 31. In this case, molten resin enters the warped part during injection molding, and the ventilation film 41 cannot be properly joined to the cover 31, but in this embodiment, the shape is such that the corner is eliminated. Therefore, with such a configuration, the end of the ventilation film 41 is less likely to warp, and the ventilation film 41 becomes easy to handle during injection molding of the cover 31. Furthermore, by using the ventilation film 41 without warping, the ventilation film 41 can be easily and stably joined to the outer periphery of the opening groove 32 and is less likely to peel off, improving the sealing performance.

[0041] Each embodiment of the present invention can be modified as desired without departing from the spirit of the invention.

[0042] In the above embodiment, the gas permeable membrane 41 is in contact with the cover 31 side, and the gas permeable membrane 41 is indirectly attached to the plate body 12 via the cover 31, but the present invention is not limited to this. For example, as in the flow path plate 11 of another embodiment shown in Fig. 11, the gas permeable membrane 41 may be directly bonded with an adhesive or the like to the upper openings 14a of the multiple ventilation holes 14 on the upper surface of the plate body 12 in a state of covering the upper openings 14a. In this case, the cover 31 itself may be omitted, but the gas permeable membrane 41 can be protected by covering the gas permeable membrane 41 with the cover 31.

[0043] In the above embodiment, the number of ventilation holes 14 is six, but it may be more or less than six. In addition, the ventilation holes 14 are not limited to being arranged in a single row, and may of course be arranged in two or three rows. Furthermore, the intervals between adjacent ventilation holes 14 do not have to be equal, and the diameters of the multiple ventilation holes 14 do not have to be the same. In addition, the planar shapes of the opening groove 32 and the ventilation membrane 41 may be changed as desired in accordance with such hole shapes and hole arrangements.

[0044] In the above embodiment, the ventilation membrane 41 is integrally formed on the outer periphery of the cover 31 during injection molding, but the present invention is not limited to this. For example, the ventilation membrane 41 may be bonded to the outer periphery of the cover 31 with an adhesive or welded to the outer periphery by various welding methods such as ultrasonic welding or vibration welding.

[0045] In the above embodiment, the resin molded product with ventilation parts of the present invention is embodied in the flow path plate 11, but is not limited thereto. For example, the resin molded product with ventilation parts may be embodied in things other than the flow path plate 11, such as case bodies for accommodating various electric and electronic devices.

[0046] In the above embodiment, the ventilation film 41 has a three-layer structure, but is not limited to this and may have a two-layer structure or a four-layer structure.

[0047] In the above embodiment, the upper plate 21 and the cover 31 are joined to the upper surface of the plate body 12, and the air permeable membrane 41 is provided on the cover 31, but this is not limited to the above. For example, a slightly larger upper plate 21 that covers the multiple air holes 14 may be joined, while the cover 31 may be omitted, and an opening may be formed in the upper plate 21, and the air permeable membrane 41 may be provided therein. Furthermore, multiple air hole forming regions R1 may be formed in one plate body 12. [Explanation of symbols]

[0048] 11: Flow channel plate as a resin molded part with ventilation 12: Plate body as the molded product body 14: Ventilation hole 15: Flow path 31: Cover 32: Opening groove as an opening 41: Breathable membrane A1: Arrangement direction of ventilation holes B1: Ventilation section R1: Vent forming area

Claims

1. A resin molded product having a ventilation part including a plurality of densely arranged ventilation holes provided in a part of a molded product body which is an injection molded product, When an area surrounding the formation sites of the plurality of vent holes is defined as an air hole formation area, the air hole formation area has an outer shape larger than the air hole formation area and has a number of fine air-permeable structures therein, The ventilation film is provided on the molded article body, and thereby the plurality of ventilation holes are collectively blocked so as to be breathable. A resin molded product with a ventilation section.

2. The molded product body is provided with a resin cover that covers the ventilation portion, The cover has an opening having an outer shape large enough to surround the vent hole formation area, The ventilation film having an outer shape larger than the opening is joined to the outer periphery of the opening.

2. The resin molded product with a ventilation section according to claim 1.

3. The resin molded product has a structure in which the cover is provided on at least one side surface of a resin plate body that is the molded product body, and is a flow path plate in which a flow path is formed in the plate body, The plurality of vent holes are formed in the plate body so as to communicate with the flow path.

3. The resin molded product with a ventilation section according to claim 2.

4. The plurality of ventilation holes are arranged in a row, The opening is an opening groove extending along an arrangement direction of the plurality of air holes, The ventilation film has an outer shape larger than the opening and has an elongated shape in a plan view.

4. The resin molded product with a ventilation section according to claim 3.

5. 5. The resin molded product with a ventilation portion according to claim 4, wherein the ventilation film has a long side and a short side, and the short side is formed in a round shape in a plan view.

6. an outer circumferential portion of the opening in the cover is made of a solidified molten resin produced by injection molding; A part of the molten resin in the outer peripheral portion penetrates into the numerous fine ventilation structures of the ventilation film, thereby bonding the ventilation film to the outer peripheral portion.

6. The resin molded product with a ventilation section according to claim 2,

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