JP4702829B2 - Vent filter and casing provided with the same - Google Patents

Description

  The present invention relates to a vent filter and a casing using the vent filter.

  Conventionally, a vent filter using a porous body has been used for housings of various devices. Examples of the various devices include electronic components for automobiles represented by an ECU (electronic control unit), a lamp, a motor, various sensors, and a pressure switch. Moreover, a mobile phone, a camera, an electric razor, an electric toothbrush, an outdoor lamp, and the like are also included.

  In addition, such a vent filter can prevent the intrusion of water and dust into the equipment, reduce the pressure rise inside the housing due to temperature changes, propagate sound, and release the gas generated inside. It is an object. Usually, the vent filter is attached to the opening part of the housing (see, for example, Patent Document 1).

  Here, the housing | casing of the apparatus provided with the vent filter is demonstrated using FIG. FIG. 7 is a cross-sectional view showing a housing provided with a conventional vent filter. As shown in FIG. 7, an opening 25 is provided on the peripheral wall of the housing 24. In addition, although not shown, a board on which electronic components are mounted is disposed inside the housing 24.

  Further, a vent filter 21 is attached to the opening portion 25. The vent filter 21 is formed by laminating an air permeable layer 22 made of a porous material and an air permeable support layer 23. Therefore, in the housing shown in FIG. 7, the vent filter 21 prevents water and dust from entering the housing, and further, the increase in internal pressure, sound propagation, and exhaust are performed.

  In addition, a label for displaying a management code of the device may be attached to the housing of such a device. For example, an automobile-related manufacturing company performs assembling with a large number of parts (devices). Each part used in the assembly is managed by a code indicating the type of vehicle used and the specification of the vehicle. Such codes are also used for production planning for ordering and delivery (for example, Patent Document 2).

For this reason, each component manufacturing company that manufactures parts attaches a label displaying the management code (bar code, two-dimensional code, etc.), product number, specification, etc. to the housing of the part in addition to the vent filter. Affixed to the body.
JP 2001-168543 A (page 3, FIG. 2) JP 2002-40943 A (page 5, FIG. 2)

  However, if both the label for management and the vent filter must be separately attached to the casing, it causes an increase in the cost of parts. Therefore, in recent years, a printed label having a function as a vent filter has been demanded.

  Moreover, the conventional vent filter (FIG. 7) is formed only by the member which has air permeability as mentioned above. For this reason, there exists a problem that intensity | strength is low and it is difficult to handle.

  An object of the present invention is to provide a vent filter that has a function as a label, has sufficient strength, and is excellent in handleability.

In order to achieve the above object, a vent filter according to the present invention is formed by laminating a breathable layer and a non-breathable reinforcing layer with an adhesive layer, and is formed on a surface opposite to the laminated surface of the breathable layer. A part or the whole is a printed part, and the air permeable layer includes a hydrophobic porous layer, and the air permeability of the hydrophobic porous layer is 0.2 to ⁵ cm ³ / (mm ² · min · KPa). The average pore diameter of the hydrophobic porous layer is in the range of 0.1 to 100 μm, the reinforcing layer has a through-hole penetrating in the thickness direction, and the ventilation of the adhesive layer The area in contact with the air-permeable layer is in the range of 9 to 75% with respect to the entire laminated surface of the air-permeable layer.

  Moreover, the housing | casing of this invention is a housing | casing which has opening, Comprising: The said opening part is covered with the vent filter of the said invention, It is characterized by the above-mentioned.

  As described above, the vent filter of the present invention has a printing portion and functions as a label, so that the cost of parts can be reduced and the air permeability reinforcing layer is provided, so that the vent filter has sufficient strength. Excellent handleability. Moreover, in the vent filter of the present invention, since the contact area of the adhesive layer with respect to the air permeable layer is set to the predetermined ratio, the air permeability of the air permeable layer is not hindered by the adhesive layer, and the vent filter is vented. The function as a filter is sufficiently secured.

In the vent filter according to the present invention, edges of the laminated surfaces of the air permeable layer and the reinforcing layer are attached by the adhesive layer having a certain thickness, and the air permeable layer and the reinforcing layer are bonded to each other. Gaps are formed between them. Furthermore, in this case, the through hole of the reinforcing layer and the gap between the air permeable layer and the reinforcing layer communicate with each other.

  In the vent filter of the present invention, the breathable layer further includes a breathable support layer, the breathable support layer and the hydrophobic porous body layer are laminated, and the breathable support layer includes It is preferably located on the adhesive layer side.

Furthermore, in the vent filter according to the present invention, the hydrophobic porous body layer is preferably a polytetrafluoroethylene (hereinafter referred to as “PTFE”) porous body layer. Further, it is preferable that the printed portion is formed so as to avoid a region corresponding to the through hole of the reinforcing layer on the surface opposite to the laminated surface of the breathable layer, and further, the printed portion of the breathable layer. Are preferably coated for printing. Moreover, it is also preferable that a second adhesive layer is formed on a surface opposite to the laminated surface of the reinforcing layer . Further, in order to facilitate handling, it is preferable that a release sheet is attached to the second adhesive layer.

  Hereinafter, the vent filter and the housing of the present invention will be specifically described. The vent filter of the present invention has a breathable layer including a hydrophobic porous body layer, a non-breathable reinforcing layer provided with a through-hole penetrating in the thickness direction, and an adhesive layer. The breathable layer and the non-breathable reinforcing layer are laminated by being adhered by an adhesive layer.

  Examples of the material for forming the hydrophobic porous layer include polyolefin resins obtained by polymerizing or copolymerizing monomers such as PTFE, ethylene, propylene, 4-methylpentene-1, and 1-butene as described above. Can be mentioned. Further, the hydrophobic porous body layer may be a mixture obtained by blending two or more of these resins.

  Among these, PTFE is preferable because it can be easily microporous, has high air permeability even in a small area, and has a high function of preventing water and dust from entering the housing. Further, the hydrophobic porous body layer may be a single layer formed of one kind of resin selected from these resins, for example, a laminate of a layer formed of PTFE and a layer formed of polyolefin It may be.

  Here, a method for forming a hydrophobic porous layer using PTFE will be described. First, a liquid lubricant is added to PTFE fine powder to form a paste-like mixture. This is then preformed. The preforming is performed at a pressure that does not squeeze out the liquid lubricant.

  The liquid lubricant may be any one that can wet the surface of the PTFE fine powder and can be removed by extraction or drying. Examples thereof include hydrocarbons such as liquid paraffin, naphtha and white oil. The amount of liquid lubricant added is suitably about 5 to 50 parts by weight per 100 parts by weight of PTFE fine powder.

  Next, paste extrusion or rolling is performed on the molded body formed by the preforming, and this is formed into a sheet shape. Further, this sheet-like molded body (PTFE molded body) is stretched at least in a uniaxial direction to obtain a PTFE porous body.

  In addition, it is preferable to perform extending | stretching of a PTFE molded object after removing a liquid lubricant. The stretching conditions can be appropriately set. For example, the temperature is set to 30 to 320 ° C., and the stretching ratio is set to 2 to 30 times in both the longitudinal direction and the transverse direction. In addition, after stretching, from the viewpoint of strength, the PTFE porous body is preferably heated and fired at a temperature equal to or higher than the melting point of PTFE.

  As a method for forming a hydrophobic porous body layer using a polyolefin resin, for example, there is a method (dry film forming method) in which a polyolefin resin is melt-extruded and molded and then stretched at low temperature and then stretched at high temperature. In addition, a method (wet film forming method) in which a polyolefin resin and an extractable agent are mixed, the mixture is subjected to treatment such as molding and stretching, and then the extractant is extracted and removed with a solvent or the like. In addition, a method of cutting a block-shaped porous body formed by fusing a granular polyolefin-based resin in a pressurized state into a predetermined shape may be used.

  In the present invention, the average pore size of the hydrophobic porous body layer is set to 0.1 μm to 100 μm. This is because if the average pore size of the hydrophobic porous body layer 4 is too large, the strength decreases, and the hydrophobicity and dustproofness also decrease. On the other hand, if the average pore diameter is too small, the air permeability decreases. Further, when the average pore size is within the above range, the ink permeability can be improved and the printed information can be clarified when printing is performed on one surface of the hydrophobic porous body layer as described later. Because.

  In the present invention, the average pore size of the hydrophobic porous material layer can be measured by a method defined in ASTM F316-86. For the measurement, for example, Porous Material Inc., USA. Perm-Porometer manufactured by the company can be used.

Further, air permeability of the hydrophobic porous layer is set to ^{0.2cm 3 / (mm 2 · min} · KPa) ~5cm 3 / (mm 2 · min · KPa). This is because if the air permeability is lower than 0.2 cm ³ / (mm ² · min · KPa), the internal pressure adjusting function may be lowered. Further, if it is higher than 5 cm ³ / (mm ² · min · KPa), there is a risk of liquid leakage. Furthermore, air permeability of the hydrophobic porous layer is preferably ^{0.5cm 3 / (mm 2 · min} · KPa) ~4cm 3 / (mm 2 · min · KPa) to may be set.

  In the present invention, the air permeability of the hydrophobic porous body layer can be measured by a method defined in JIS P 8117. Further, the air permeability of the hydrophobic porous body layer can be set to the above range by appropriately setting the thickness, average pore diameter, porosity and the like of the porous body layer. For example, the average pore diameter may be set to the above range, the thickness may be set to the following range, and the porosity may be set to about 40% to 95%.

  The thickness of the hydrophobic porous body layer is preferably set to 5 μm to 500 μm, for example. This is because if the thickness of the hydrophobic porous body layer is too thin, the strength is lowered and the processing becomes difficult, and if the thickness is too thick, the air permeability is lowered. The thickness of the hydrophobic porous layer is preferably set to 10 μm to 300 μm.

  In addition to the hydrophobic porous body layer, the air permeable layer can also have an air permeable support layer. Specifically, it is preferable to laminate a hydrophobic porous body layer and a breathable support layer so that the breathable support layer is located on the adhesive layer side, and this laminate is used as a breathable layer.

  In this case, the strength of the breathable layer itself can be improved. In addition, since stress generated in the hydrophobic porous body layer due to pressurization and decompression inside the casing to which the vent filter is attached can be relieved, it is possible to suppress damage to the air-permeable layer and deterioration of the liquid leakage prevention function.

  The breathable support layer may have any breathability, and preferably has a larger air permeability than the breathable layer. The constituent material, structure, form, etc. of the breathable support layer are not particularly limited. For example, as the air-permeable support layer, ultra-high molecular weight polyethylene porous material, nonwoven fabric, woven fabric, net, mesh, sponge, foam, metal porous material, metal mesh, and other various porous materials can be used. However, among these, non-woven fabrics are preferable from the viewpoint of ease of joining work to the hydrophobic porous body layer and weldability.

  Moreover, the joining method of a hydrophobic porous body layer and an air permeable support layer is not specifically limited. As a specific joining method, for example, a joining method by welding such as heat welding, ultrasonic welding, and vibration welding may be mentioned. In addition, a bonding method using an adhesive typified by a pressure-sensitive adhesive, a bonding method using thermal lamination, and the like are also included.

  When the joining method using thermal lamination is adopted, a part of the breathable support layer may be melted to join the hydrophobic porous body layer and the breathable support layer. Further, a fusing agent such as hot melt powder may be interposed at the interface between the hydrophobic porous body layer and the air-permeable support layer, and these may be joined by the fusing agent.

  In addition, similarly to the non-breathable reinforcing layer, the breathable support layer can be provided with a through-hole penetrating in the thickness direction. This aspect is particularly preferable when it is necessary to ensure air permeability, for example, when the hydrophobic porous body layer and the air-permeable support layer are bonded with an adhesive.

  In addition, when the dustproof property and the waterproof property of the breathable support layer are low, dust and water may enter from the side surface of the breathable support layer. Therefore, in order to prevent intrusion of dust and water from the side surface of the breathable support layer, the side surface of the breathable support layer can be subjected to a treatment for losing the breathability such as welding.

  The adhesive layer for adhering the breathable layer and the non-breathable reinforcing layer is provided with a limited area in contact with the breathable layer in order to ensure breathability. Specifically, the area where the adhesive layer contacts the breathable layer is set in the range of 9% to 75% with respect to the entire area of the laminated surface of the breathable layer. This is because if the area where the adhesive layer contacts the air permeable layer is too large, the air permeability of the vent filter is hindered. Moreover, it is because the adhesive force of a breathable layer and a non-breathable reinforcement layer will be insufficient if the area where the adhesive layer contacts the breathable layer is too small. More preferably, the area where the adhesive layer contacts the breathable layer is set to a range of 15% to 70% with respect to the entire area of the laminated surface of the breathable layer. The adhesive layer can be formed by, for example, a pressure sensitive adhesive, a hot melt adhesive, a thermosetting adhesive, or the like.

  In addition, the adhesive layer is bonded to the edges of the laminated surface of the breathable layer and the non-breathable reinforcing layer, and a gap is formed between the breathable layer and the non-breathable reinforcing layer depending on the thickness of the adhesive layer. It is a preferable aspect to provide as described above. This is because air and gas can be moved smoothly by forming a gap.

  The non-breathable reinforcing layer can be formed of non-breathable materials such as various resin films and metal foils. Examples of the various resin films include films of polyolefin resins, polyvinyl resins, polyester resins, polyurethane resins, polyamide resins, polyacrylic resins, and the like. The through hole provided in the non-breathable reinforcing layer is preferably provided so as to communicate with the void formed by the adhesive layer.

  In the vent filter of the present invention, a part or all of the surface opposite to the laminated surface of the air permeable layer is a printing portion. For this reason, the vent filter of the present invention functions as a label. However, it is preferable that the printed portion is provided so as to avoid a region corresponding to the through hole of the non-breathable reinforcing layer on the breathable layer. Information printed on the breathable layer is not particularly limited. The information to be printed includes, for example, information consisting of characters, figures, symbols such as product names, barcodes, two-dimensional codes, and pattern information.

  Examples of the method for printing on the air-permeable layer include a printing method using ink such as thermal transfer and ink jet, and a laser printing method using no ink. In the case of employing a thermal transfer printing method, for example, a thermal transfer ink sheet formed of a thermal transfer ink such as a resin or a wax can be used.

  Moreover, when printing information with ink, it is preferable that the printing surface of the air-permeable layer is formed of a hydrophobic porous layer. This is because when the printing surface is formed of a hydrophobic porous body layer, information is displayed as ink permeates and fixes in the pores, so that the wear resistance of the printed information is improved.

  In this case, the printing surface of the hydrophobic porous layer is preferably subjected to various treatments such as corona discharge treatment and chemical etching treatment in order to increase the ink permeability. Furthermore, it is also preferable to promote the ink permeation into the porous body by subjecting the printing surface of the hydrophobic porous layer to a heat treatment with a hot roll or the like.

  Further, in order to improve the fixing property of the ink to the hydrophobic porous material layer, it is preferable to perform a coating treatment for printing on the printing surface of the hydrophobic porous material layer. Specifically, for example, a surface coat layer for printing containing inorganic powder such as silica, titania, alumina or the like is formed. Such inorganic powder may be used individually by 1 type, and may be used in combination of 2 or more type.

  The surface coat layer may be for the purpose of coloring and improving heat resistance. For example, when the surface coat layer contains a pigment having a color having a large contrast with the printing ink (for example, a white pigment when the printing ink is black), information is printed clearly. Moreover, when a surface coat layer contains antioxidant, the heat resistance of a vent filter can be improved.

  The surface coating layer can be formed, for example, by applying a surface coating treatment liquid to the printing surface of the hydrophobic porous layer by a gravure coating method or the like, and heating and solidifying the applied surface coating treatment liquid. The coating liquid can be obtained, for example, by dissolving the above inorganic powder, pigment, antioxidant and the like in an appropriate solvent and an organic binder. In addition, as an organic binder, a polyurethane, polyester, an epoxy resin, an acrylic resin etc. are mentioned, for example. Moreover, toluene, acetone, etc. are mentioned as a solvent.

  In this invention, it is preferable to form the 2nd adhesive bond layer for sticking a vent filter to a housing | casing etc. in the surface on the opposite side to the lamination surface of a non-breathable reinforcement layer. The second adhesive layer may be formed on the vent filter in advance, or may be formed when the vent filter is attached to the outside.

  In addition, in order to ensure the air permeability in a vent filter, it is preferable to provide the 2nd adhesive bond layer also with the through-hole penetrated in the thickness direction similarly to the non-air-permeable reinforcement layer. Moreover, it is preferable to provide the through hole provided in the second adhesive layer so that the through hole provided in the non-breathable reinforcing layer and the opening portion are aligned. The second adhesive layer can also be formed of, for example, a pressure-sensitive adhesive, a hot melt adhesive, a thermosetting adhesive, and the like, similarly to the adhesive layer that adheres the breathable layer and the non-breathable reinforcing layer.

  As a method of forming the second adhesive layer on the non-breathable reinforcing layer, in the case of a hot melt adhesive, for example, a heat laminating method, an extrusion coating method, a coating method, or the like can be given. In the case of a pressure-sensitive adhesive, for example, it can be formed by directly applying to a non-breathable reinforcing layer. Furthermore, in the case of a pressure-sensitive adhesive, for example, a pressure-sensitive adhesive may be applied on a release sheet to provide a second adhesive layer, and this second adhesive layer may be transferred to the non-breathable reinforcing layer. . Moreover, the sheet | seat in which the layer of the pressure sensitive adhesive was provided in both surfaces can be affixed on the lower surface of a non-breathable reinforcement layer, and this can also be used as a 2nd adhesive bond layer.

(Embodiment 1)
Next, the vent filter and the housing according to Embodiment 1 of the present invention will be described with reference to FIGS. 1A and 1B are perspective views showing a vent filter according to Embodiment 1 of the present invention, in which FIG. 1A is a perspective view showing the whole, and FIG. 1B is an exploded perspective view. 2 is a cross-sectional view of the vent filter. FIG. 2A shows a cross section taken along the cutting line AA ′ in FIG. 1A, and FIG. 2B is a cross-sectional view in FIG. The cross section along the cutting line BB 'is shown. In FIG. 1 and FIG. 2, the same parts are denoted by the same reference numerals.

  As shown in FIGS. 1 to 2, the vent filter 11 is formed by bonding an air permeable layer 1 and a non-air permeable reinforcing layer 2 with an adhesive layer 3. For this reason, the strength of the vent filter 11 is improved by the non-breathable reinforcing layer 2, and the handleability is improved accordingly.

  Moreover, in the example of FIGS. 1-2, the air permeable layer 1 is formed by laminating a hydrophobic porous body layer 4 and an air permeable support layer 5. For this reason, the strength of the breathable layer 1 itself is also improved, and the handling is further improved. Further, the air-permeable support layer 5 relaxes the bending that occurs in the hydrophobic porous body layer 4 due to pressurization and decompression inside the housing (see FIG. 3). The air permeable layer 1 may be constituted only by the hydrophobic porous body layer 4.

  Further, as shown in FIGS. 1B, 2A, and 2B, the adhesive layer 3 has an area in contact with the air permeable layer 1 of 9 with respect to the entire area of the air permeable layer. % To 75%. Specifically, it is formed in a square shape along the edge of the breathable layer 1. Therefore, the breathable layer 1 and the non-breathable reinforcing layer 2 are attached to each other at the edges of the laminated surfaces. Furthermore, a gap 9 is formed between the air-permeable layer 1 and the non-air-permeable reinforcing layer 2 due to the thickness of the adhesive layer 3.

  The adhesive layer 3 can be formed, for example, by forming the adhesive layer 3 on one surface of the sheet to be the non-breathable reinforcing layer 2 and punching it into a square shape. The shape of the adhesive layer 3 may be a shape other than the square shape shown in FIG. 1B, and may be a shape that does not impair the ventilation function of the vent filter 11.

  In addition, as a method of forming the adhesive layer 3 into the above-mentioned square shape or the like, in addition to the above-described method by punching, for example, a method of coating the adhesive in a square shape or opening in a square shape Examples include a method of applying an adhesive after masking.

  Further, as shown in FIGS. 1B and 2A, the non-breathable reinforcing layer 2 is provided with a through hole 7 penetrating in the thickness direction of the vent filter 11. The through hole 7 communicates with the gap 9. Further, a second adhesive layer 6 for attaching the vent filter 11 to the housing (see FIG. 3) is provided on the surface (lower surface) opposite to the laminated surface of the air-impermeable reinforcing layer 2. Yes. The second adhesive layer 6 is also provided with a through hole 8 penetrating in the thickness direction. The opening of the through hole 8 and the opening of the through hole 7 of the non-breathable reinforcing layer 2 are aligned.

  For this reason, ventilation is possible between the upper surface 10 of the breathable layer 1 and the lower surface of the non-breathable reinforcing layer 2. Therefore, if the vent filter 11 is affixed to the opening of the housing, the pressure rise inside the housing due to temperature change, the propagation of sound, The generated gas can be released.

  In order to further improve the air permeability, the air-permeable support layer 5 can also be provided with a through-hole penetrating in the thickness direction. Furthermore, the through-hole provided in the air-permeable support layer 5 and the through-hole 7 provided in the non-air-permeable reinforcing layer 2 can be formed so as to be aligned with the gap 9 formed by the adhesive layer 3. That is, the air-permeable support layer 5 and the non-air-permeable reinforcing layer 2 can be formed in a square shape similar to the adhesive layer 3.

  As shown in FIGS. 1A and 1B, information is printed on the surface 10 opposite to the laminated surface of the air-permeable layer 1, and the vent filter 11 functions as a label. In the example shown in FIGS. 1A and 1B, information is printed on the surface 10 of the breathable layer 1 corresponding to the through hole 7 of the non-breathable reinforcing layer 2 (the region surrounded by a dotted line in FIG. 1). ) Is done. For this reason, a decrease in air permeability due to printing of information is suppressed.

  Next, the usage method of the vent filter in this Embodiment 1 is demonstrated using FIG. FIG. 3 is a cross-sectional view showing an example in which the vent filter shown in FIG. 1 is attached to a housing. In FIG. 3, the cross section of the vent filter is shown as a cross section cut along the cutting line CC ′ in FIG.

  As shown in FIG. 3, the vent filter 11 is affixed to the housing 12 via the second adhesive layer 6 so that the through holes 7 and 8 communicate with the opening 13 of the housing 12. Therefore, ventilation is possible between the inside and outside of the housing 12 via the vent filter 11.

  Thus, if the vent filter 11 is affixed to the housing 12, the suppression of water and dust intrusion into the housing, the ventilation between the inside and the outside of the housing, and the display of information are all achieved simultaneously. it can. Therefore, if the vent filter 11 is used, it is not necessary to separately attach the vent filter and the label to the housing 12, so that the cost can be reduced.

  In the present invention, the shape of the housing 12 and the shape of the opening 13 are not particularly limited. Further, the material for forming the housing 12 is not particularly limited, and the housing 12 may be formed of, for example, a metal material or a resin material.

  Further, the stored items stored in the housing 12 are not particularly limited. Examples of stored items include a substrate on which electronic components such as a CPU are mounted, a light source, an acoustic device, and other electronic devices.

  Next, aspects such as storage and transportation of the vent filter in the first embodiment will be described. FIG. 4 is a perspective view showing a state in which the vent filter shown in FIG. 1 is attached to a release sheet, and FIGS. 4A and 4B show examples in which the release sheet has different modes.

  In the first embodiment, the vent filter 11 is preferably stored or transported while being attached to the release sheet 14 as shown in FIG. Thus, when the vent filter 11 is affixed to the release sheet 14, the handling of the vent filter 11 can be facilitated, and the workability of the affixing work of the vent filter 11 can be improved.

  FIG. 4A shows an example in which a plurality of vent filters 11 are attached in a matrix on one release sheet 14. FIG. 4B shows an example in which the release sheet 14 has a strip shape and a plurality of vent filters 11 are attached in one row.

  In the example of FIG. 4B, the release sheet 14 can be wound into a roll with a plurality of vent filters 11 attached. Therefore, when the vent filter 11 is attached to the housing 12 (see FIG. 3) by an automatic mounting machine, the pick-up property can be improved and the attachment can be easily automated. In this case, the pasting operation time can be shortened, and the pasting cost can be reduced.

(Embodiment 2)
Next, a vent filter and a housing according to Embodiment 2 of the present invention will be described with reference to FIGS. 5A and 5B are perspective views showing a vent filter according to Embodiment 2 of the present invention, in which FIG. 5A is a perspective view showing the whole, and FIG. 5B is an exploded perspective view. 6 is a cross-sectional view of the vent filter shown in FIG. 5, FIG. 6 (a) shows a cross section along the cutting line DD ′ in FIG. 5 (a), and FIG. The cross section along the cutting line EE 'in a) is shown. 5 and 6, the same parts as those shown in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIG.

  As shown in FIG. 5B, in the vent filter 15, the shape of the adhesive layer 16 that joins the breathable layer 1 and the non-breathable reinforcing layer 2 is different from that of the vent filter 11 in the first embodiment. . In other respects, the vent filter 15 is configured in the same manner as the vent filter 11 in the first embodiment.

  Specifically, as shown in FIGS. 5B and 6B, the adhesive layer 16 includes a partition portion 16b in addition to the square-shaped portion 16a similar to the adhesive layer 3 in the first embodiment. It has. In the vent filter 15, the gap 17 between the breathable layer 1 and the non-breathable reinforcing layer 2 is partitioned into a plurality of rooms.

  For this reason, in this Embodiment 2, the intensity | strength of a housing | casing can be improved with the partition part 16b. In addition, when a pressure difference is generated between the inside and the outside of the housing as the temperature changes, the breathable layer 1 may bend up and down along the thickness direction. The amount of bending can be reduced by the partition portion 16b.

  In addition, also as the forming method of the adhesive layer 16, as in the first embodiment, the adhesive is applied after a method of applying the adhesive into a desired shape or masking that exposes the desired shape. Methods and the like.

  As described above, the vent filter 15 can be ventilated similarly to the vent filter 11 of the first embodiment. Therefore, if the vent filter 15 is affixed to the housing shown in FIG. 3, the same effect as in the first embodiment can be obtained.

  Next, examples of the present invention will be described. Similarly to the vent filter shown in FIGS. 1 and 2, a vent filter in which an adhesive layer 3 for joining the breathable layer 1 and the non-breathable reinforcing layer 2 was formed in a square shape was produced.

  In Example 1, unlike the example of FIGS. 1 and 2, the air-permeable support layer 5 is also provided with a through hole as described later. Further, unlike the examples of FIGS. 1 and 2, the through hole of the breathable support layer 5, the through hole 7 of the non-breathable reinforcing layer 2, and the through hole 8 of the second adhesive layer 6 are formed in a rectangular shape. The openings of the through holes coincide with the inner edge of the square-shaped adhesive layer 3.

  First, an adhesive film in which a pressure-sensitive adhesive layer is provided on both surfaces of a substrate formed of a nonwoven fabric (“No. 500” manufactured by Nitto Denko Corporation), a release sheet is temporarily attached to one pressure-sensitive adhesive layer 2) were prepared. Of these two adhesive films, the base material of one adhesive film was the breathable support layer 5, and the adhesive layer on one side of this one adhesive film was the adhesive layer 3. The other adhesive film was a second adhesive layer 6 for attaching the vent filter to the housing.

  Next, one adhesive film is attached to each of both surfaces of a polyethylene terephthalate film (thickness 50 μm) to be the non-breathable reinforcing layer 2, and then cut into a size of 40 mm × 40 mm. Punched with a dimension of 38 mm. Thus, the air-permeable support layer 5 (having the adhesive layer and the release sheet temporarily attached to the adhesive layer on the upper surface), the adhesive layer 3, the non-air-permeable reinforcing layer 2, and the second adhesive. A laminate comprising the agent layer 6 (having a release sheet temporarily attached to the lower surface) is obtained. This laminate has a square shape with an outer edge dimension of 40 mm × 40 mm and an inner edge dimension of 38 mm × 38 mm. In addition, the laminate includes a breathable support layer 5, an adhesive layer on the upper surface, a release sheet temporarily attached to the adhesive layer, an adhesive layer 3, a non-breathable reinforcing layer 2, and a second adhesive layer. 6 and a through hole (cross-sectional shape: rectangular shape of 38 mm × 38 mm) through which the release sheet temporarily attached to the lower surface thereof communicates.

Next, a PTFE porous membrane (manufactured by Nitto Denko Corporation) having a thickness of 80 μm, an air permeability of 0.2 cm ³ / (mm ² · min · KPa), and an average pore diameter of 0.5 μm is used as the hydrophobic porous layer 4. TEMISH ") is prepared and cut into a 40 mm x 40 mm rectangle. Information was printed on one surface of the PTFE porous membrane.

  Then, the release sheet temporarily attached to the adhesive layer on the upper surface of the air-permeable support layer 5 in the B-shaped laminate is peeled off, and information on the PTFE porous film is not printed on the adhesive layer. The surface was affixed to obtain a vent filter of Example 1 (a release sheet was temporarily attached to the lower surface of the second adhesive layer 6).

  In the obtained vent filter, the air-permeable layer 1 of the adhesive layer 3 (the PTFE porous film that becomes the hydrophobic porous body layer 4 and the nonwoven fabric that becomes the air-permeable support layer 5 are bonded to each other). ) Was about 10% of the total area of the laminated surface of the breathable layer 1 (the entire laminated surface).

  Next, a casing having the same shape as the casing shown in FIG. 3 was produced by injection molding using polybutylene terephthalate (“CG7640” manufactured by Teijin). The thickness of the obtained casing was 3 mm, and the size of the opening was 38 mm × 2 mm.

  Next, after peeling off the remaining release sheet of the vent filter, the vent filter was attached to the casing so that the opening of the casing and the through hole obtained by punching were aligned. Thereafter, the water pressure test, the dustproof test, and the air permeability test described below were performed on this housing, and the evaluation was performed.

(Water pressure test)
The case was placed in a container containing water and submerged, and left for 5 minutes. At this time, the water depth of the vent filter was set to 5 cm. The invasion of water into the housing was confirmed visually.

[Dust-proof test]
200 g of test dust No. 8 (Kanto Loam, JIS Z 8901) and a case were placed in a container. Next, the container was rotated at a speed of 10 rotations / minute for 10 minutes. Thereafter, the casing was taken out from the container, and the intrusion of dust into the casing was visually confirmed.

(Breathability test)
A housing in which a non-breathable seal is previously attached to the entire vent filter is prepared, and the temperature of the housing is raised to 40 ° C. in that state. When the temperature reaches 40 ° C., the non-breathable seal attached to the vent filter is peeled off. Then, the time from when the non-breathable seal is peeled off (start time) until the internal pressure of the housing becomes the same as the external pressure is measured.

[Evaluation]
As a result of the water pressure test and the dustproof test, the penetration of water and dust into the housing could not be confirmed. As a result of the air permeability test, the time required for the internal pressure of the housing to be the same as the external pressure was about 180 seconds.

  Using the members used in Example 1, a vent filter according to Embodiment 2 was produced. However, the shape of the adhesive layer 16 that joins the breathable layer 1 and the non-breathable reinforcing layer 2 is as shown in FIG. The adhesive layer was formed by applying an adhesive after masking.

  In the obtained vent filter, the area of the adhesive layer 16 in contact with the breathable layer 1 was 70% with respect to the total area of the laminated surface of the breathable layer 1. The size of the vent filter was 40 × 40 mm as in Example 1.

  Next, as in Example 1, the obtained vent filter was attached to the same housing as in Example 1. Thereafter, the obtained casing was subjected to the water pressure test, the dustproof test, and the air permeability test shown in Example 1 and evaluated.

  As a result, also in Example 2, as in Example 1, as a result of the water pressure test and the dustproof test, the intrusion of water and dust into the housing could not be confirmed. In Example 2, as a result of the air permeability test, the time until the internal pressure of the casing became the same as the external pressure was about 540 seconds.

As the hydrophobic porous material layer 4, a PTFE porous membrane (“TEMISH” manufactured by Nitto Denko Corporation) having a thickness of 80 μm, an air permeability of 5 cm ³ / (mm ² · min · KPa), and an average pore diameter of 100 μm is used. Except for this, a vent filter and a casing were produced in the same manner as in Example 1. Further, the obtained casing was subjected to the water pressure resistance test, the dustproof test, and the air permeability shown in Example 1. Tests were conducted and evaluated.

  As a result, also in Example 3, as in Example 1, as a result of the water pressure resistance test and the dustproof test, the intrusion of water and dust into the housing could not be confirmed. In Example 3, in the air permeability test, the time until the internal pressure of the housing became the same as the external pressure was about 7 seconds.

As the hydrophobic porous body layer 4, a PTFE porous membrane (“TEMISH” manufactured by Nitto Denko Corporation) having a thickness of 80 μm, an air permeability of 5 cm ³ / (mm ² · min · KPa), and an average pore diameter of 100 μm is used. Using. Except for this, a vent filter and a housing were produced in the same manner as in Example 2. Moreover, about the obtained housing | casing, the water pressure test, the dustproof test, and the air permeability test which were shown in Example 1 were done, and the evaluation was performed.

  As a result, also in Example 4, as in Example 1, as a result of the water pressure test and the dustproof test, the intrusion of water and dust into the housing could not be confirmed. In Example 4, as a result of the air permeability test, the time until the internal pressure of the housing became the same as the external pressure was about 22 seconds.

(Comparative Example 1)
A vent filter was produced in the same manner as in Example 1 except that the size of the rectangular through hole formed by punching was 38.6 mm × 38.6 mm. In the obtained vent filter, the area of the adhesive layer 3 in contact with the breathable layer 1 was 7% with respect to the total area of the laminated surface of the breathable layer 1. Thereafter, this vent filter was attached to the same housing as in Example 1. About this housing | casing, the water pressure test, the dustproof test, and the air permeability test which were shown in Example 1 were done, and the evaluation was performed.

  As a result, in Comparative Example 1, the penetration of water and dust into the housing was confirmed as a result of the water pressure resistance test and the dustproof test. That is, water and dust have entered from the joint portion between the adhesive layer 3 and the breathable support layer 5 and the joint portion between the adhesive layer 3 and the non-breathable reinforcing layer 2. This is because in Comparative Example 1, the adhesive force of the adhesive layer 3 was not sufficient. In Comparative Example 1, as a result of the air permeability test, the time until the internal pressure of the casing became the same as the external pressure was about 175 seconds.

(Comparative Example 2)
A vent filter was produced in the same manner as in Example 2 except that the area of the adhesive layer 16 in contact with the breathable layer 1 was 80% with respect to the total area of the laminated surface of the breathable layer 1. This vent filter was affixed to the housing, and the water pressure test, dustproof test, and air permeability test shown in Example 1 were performed and evaluated.

  As a result, in Comparative Example 2, infiltration of water and dust into the housing could not be confirmed in the water pressure resistance test and the dustproof test. However, as a result of the air permeability test, the time until the internal pressure of the housing became the same as the external pressure was about 813 seconds. For this reason, the vent filter of Comparative Example 2 did not have sufficient ventilation performance.

  The vent filter of the present invention has a function as a label, further has sufficient strength, and is excellent in handleability. Therefore, the vent filter of the present invention is useful for applications such as covering electrical appliances for automobiles, mobile phones, cameras, electric razors, electric toothbrushes, outdoor lamps and the like.

1A and 1B are perspective views showing a vent filter according to Embodiment 1 of the present invention. FIG. 1A is a perspective view showing the whole, and FIG. 1B is an exploded perspective view. FIG. 2A is a cross-sectional view of the vent filter, FIG. 2A shows a cross section taken along a cutting line AA ′ in FIG. 1A, and FIG. 2B is a cutting line B- in FIG. The cross section along B ′ is shown. It is sectional drawing which shows the example which affixed the said vent filter on the housing | casing. It is a perspective view which shows the state which affixed the said vent filter on the peeling sheet, and Fig.4 (a) and (b) have shown the example from which the aspect of a peeling sheet differs, respectively. 5A and 5B are perspective views showing a vent filter according to Embodiment 2 of the present invention, in which FIG. 5A is a perspective view showing the whole, and FIG. 5B is an exploded perspective view. 6 is a cross-sectional view of the vent filter shown in FIG. 5, FIG. 6 (a) shows a cross section along the cutting line DD ′ in FIG. 5 (a), and FIG. The cross section along the cutting line EE 'in a) is shown. It is sectional drawing which shows the housing | casing provided with the conventional vent filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Breathable layer 2 Non-breathable reinforcement layer 3, 16 Adhesive layer for pasting breathable layer and non-breathable reinforcement layer 4 Hydrophobic porous body layer 5 Breathable support layer 6 For pasting vent filter to outside Adhesive layer 7 through-hole of non-breathable reinforcing layer 8 through-hole of adhesive layer 9, 17 void 10 upper surface of hydrophobic porous layer 11 vent filter 12 housing 13 opening portion 14 release sheet 16a square-shaped portion 16b Partition part

Claims (7)

A surface that is formed of a breathable layer and a non-breathable material and has a through-hole in the thickness direction attached and laminated with an adhesive layer, and that faces the surface of the breathable layer that contacts the adhesive layer A part or all of the printed part is a printed part, and the breathable layer includes a hydrophobic porous layer, and the printed part is formed on the surface of the hydrophobic porous layer. The air permeability is in the range of 0.2 to ⁵ cm ³ / (mm ² · min · KPa), the average pore diameter of the hydrophobic porous body layer is in the range of 0.1 to 100 μm, and the adhesive layer area in contact with the breathable layer, the ranges of 9-75% total laminate surface to the breathable layer, the hydrophobic porous material layer, Ri polytetrafluoroethylene porous body layer der, the vent The edges of the laminated surfaces of the adhesive layer and the reinforcing layer have a certain thickness. Adhered by an adhesive layer, a gap is formed between the breathable layer and the reinforcing layer, and a through hole of the reinforcing layer communicates with a gap between the breathable layer and the reinforcing layer. and it has a vent filter. The breathable layer further comprises a permeable support layer, and the air-permeable support layer and the hydrophobic porous layers are laminated, the claim permeable support layer is positioned on the adhesive layer side 1 Vent filter described in. The vent filter according to claim 1 or 2 , wherein the printed portion is formed on a surface opposite to the laminated surface of the breathable layer so as to avoid a region corresponding to the through hole of the reinforcing layer. The vent filter according to any one of claims 1 to 3 , wherein a print portion of the breathable layer is subjected to a coating process for printing. The vent filter according to any one of claims 1 to 4, wherein a second adhesive layer is formed on a surface of the reinforcing layer facing a surface in contact with the adhesive layer. The vent filter according to claim 5, wherein a release sheet is adhered to the second adhesive layer. A housing having an opening, wherein the opening is covered with the vent filter according to claim 1 .

Images