WO2021033571A1 - カバー部材及びこれを備える部材供給アセンブリ - Google Patents

カバー部材及びこれを備える部材供給アセンブリ Download PDF

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Publication number
WO2021033571A1
WO2021033571A1 PCT/JP2020/030270 JP2020030270W WO2021033571A1 WO 2021033571 A1 WO2021033571 A1 WO 2021033571A1 JP 2020030270 W JP2020030270 W JP 2020030270W WO 2021033571 A1 WO2021033571 A1 WO 2021033571A1
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Prior art keywords
cover member
base material
film
protective film
material layer
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PCT/JP2020/030270
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English (en)
French (fr)
Inventor
陽輔 菅谷
裕貴 木上
Original Assignee
日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to DE112020003876.9T priority Critical patent/DE112020003876T5/de
Priority to CN202080005478.7A priority patent/CN112789226A/zh
Priority to US17/632,676 priority patent/US20220348393A1/en
Priority to CN202211031070.4A priority patent/CN115367303A/zh
Priority to JP2020568575A priority patent/JP6845974B1/ja
Priority to KR1020207037732A priority patent/KR102335705B1/ko
Publication of WO2021033571A1 publication Critical patent/WO2021033571A1/ja

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    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0242—Acrylic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0264—Polyester
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/08—Closed cell foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2435/00—Closures, end caps, stoppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2435/00—Closures, end caps, stoppers
    • B32B2435/02—Closures, end caps, stoppers for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2585/00—Containers, packaging elements or packages specially adapted for particular articles or materials
    • B65D2585/68—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form
    • B65D2585/86—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form for electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/28—Wound package of webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/18—Form of handled article or web
    • B65H2701/184—Wound packages
    • B65H2701/1842—Wound packages of webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1944—Wrapping or packing material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/046—Presence of homo or copolymers of ethene in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate

Definitions

  • the present invention relates to a cover member arranged on the surface of an object having a surface having an opening to prevent the passage of foreign matter in the opening, and a member supply assembly for supplying the member.
  • Patent Document 1 describes a waterproof breathable membrane, a first double-sided adhesive tape bonded to the peripheral edge of the surface of the waterproof breathable membrane, and a first surface bonded to the peripheral edge of the surface of the waterproof breathable membrane opposite to the surface.
  • a waterproof ventilation member comprising a two-sided adhesive tape and the base material of the first double-sided adhesive tape being a foam.
  • the cover member is usually supplied in a state of being arranged on a member supply sheet such as a liner sheet.
  • the cover member supplied in this state is placed on the surface of the object after being peeled from the sheet.
  • the most distant layers are, for example, protective films and tab films.
  • the cover member from the sheet is low, the force for lifting the cover member is concentrated and the protective film may be damaged. Breakage is particularly likely to occur in cover members with a protective film that is highly breathable in the thickness direction.
  • An object of the present invention is to provide a cover member having excellent peelability from a sheet for supplying a member.
  • the present invention A cover member that is arranged on the surface of an object having a surface having an opening to prevent foreign matter from passing through the opening.
  • a protective film having a shape that covers the opening when the cover member is arranged on the surface,
  • a first base material layer bonded to one main surface of the protective film is provided.
  • the first base material layer has a laminated structure including two or more base material films, and is located between the protective film and the surface when the cover member is arranged on the surface.
  • the two or more base films are cover members including a non-foaming film and a foaming film. I will provide a.
  • the present invention A sheet for supplying members and a cover member arranged on the sheet are provided.
  • the cover member is the cover member of the present invention.
  • a first base material layer having a laminated structure of two or more base material films including a non-foamed film and a foamed film is bonded to a protective film.
  • the first substrate layer is located between the protective film and the surface when placed on the surface of the object.
  • the cover member supplied by the member supply sheet such as the liner sheet is usually arranged so that the side in contact with the sheet is in contact with the surface of the object. Therefore, the first base material layer is located on the sheet side when supplied by the sheet.
  • the cover member of the present invention is relatively rigid, and is relatively flexible with a non-foamed film capable of efficiently transmitting the above force to the cover member as a force for peeling the member while preventing excessive deformation.
  • the first base material layer is provided with a foamed film that allows appropriate deformation of the first base material layer located on the sheet side.
  • the cover member of the present invention has a structure suitable for improving the peelability from the sheet for supplying the member.
  • FIG. 1A is a cross-sectional view schematically showing an example of the cover member of the present invention.
  • FIG. 1B is a plan view of the cover member of FIG. 1A as viewed from the side of the protective film.
  • FIG. 2 is a cross-sectional view schematically showing another example of the cover member of the present invention.
  • FIG. 3 is a cross-sectional view schematically showing another example of the cover member of the present invention.
  • FIG. 4 is a cross-sectional view schematically showing still another example of the cover member of the present invention.
  • FIG. 5 is a cross-sectional view schematically showing another example of the cover member of the present invention.
  • FIG. 6A is a cross-sectional view schematically showing another example of the cover member of the present invention.
  • FIG. 1B is a plan view of the cover member of FIG. 1A as viewed from the side of the protective film.
  • FIG. 2 is a cross-sectional view schematically showing another example of the cover member of the present invention.
  • FIG. 6B is a plan view of the cover member of FIG. 6A as viewed from the side of the second base material layer.
  • FIG. 7 is a cross-sectional view schematically showing another example of the cover member of the present invention.
  • FIG. 8A is a cross-sectional view schematically showing another example of the cover member of the present invention.
  • FIG. 8B is a plan view of the cover member of FIG. 8A as viewed from the tab film side.
  • FIG. 9 is a schematic view showing an example of arrangement of the cover member of the present invention on an object.
  • FIG. 10 is a schematic view showing another example of arrangement of the cover member of the present invention on an object.
  • FIG. 11 is a plan view schematically showing an example of the member supply assembly of the present invention.
  • FIG. 12 is a cross-sectional view schematically showing an example of the arrangement of the cover member of the present invention with respect to the sheet for supplying the member.
  • FIG. 13 is a cross-sectional view schematically showing another example of the arrangement of the cover member of the present invention with respect to the sheet for supplying the member.
  • FIGS. 1A and 1B An example of the cover member of the present invention is shown in FIGS. 1A and 1B.
  • FIG. 1B is a plan view of the cover member 1 (1A) of FIG. 1A as viewed from the side of the protective film 2.
  • FIG. 1A shows a cross section AA of FIG. 1B.
  • the cover member 1A is a member arranged on the surface 53 of the object 51 having the surface 53 having the opening 52 to prevent the passage of foreign matter in the opening 52.
  • 1A and 1B show a cover member 1A arranged on the surface 53 of the object 51.
  • the cover member 1A includes a protective film 2 and a first base material layer 3 bonded to one main surface of the protective film 2.
  • the cover member 1A is composed of a laminate including the protective film 2 and the first base material layer 3.
  • the protective film 2 has a shape that covers the opening 52 when the cover member 1A is arranged on the surface 53.
  • the first base material layer 3 is located between the protective film 2 and the surface 53 when the cover member 1A is arranged on the surface 53.
  • the first base material layer 3 has a laminated structure including two base material films 11.
  • the first base material layer 3 includes, as the base film 11, a non-foamed film 11A made of a non-foamed material and a foamed film 11B made of a foamed material.
  • the foamed film 11B is located farther from the protective film 2 than the non-foamed film 11A.
  • the cover member 1A is peeled off, the deformation of the first base material layer 3 by the foamed film 11B becomes more appropriate, and the peelability of the cover member 1A can be improved.
  • the base film 11 located at the position farthest from the protective film 2 in the first base material layer 3 is the foamed film 11B. In this form, the improvement of the peelability based on the above-mentioned appropriate deformation becomes more certain.
  • the laminated structure of the first base material layer 3 is not limited to the above example as long as the non-foaming film 11A and the foamed film 11B are included as the two or more base film 11.
  • the first base material layer 3 may include two or more non-foaming films 11A and / or two or more foamed films 11B.
  • FIG. 2 shows a modified example in which the structure of the first base material layer 3 is different.
  • the cover member 1A of FIG. 2 has the same configuration as the cover member 1A of FIGS. 1A and 1B except that the configuration of the first base material layer 3 is different.
  • the first base material layer 3 of FIG. 2 includes two non-foaming films 11A and 11C and one foamed film 11B as the base film 11.
  • the non-foamed films 11A and 11C and the foamed film 11B are laminated in this order.
  • the foamed film 11B is located farther from the protective film 2 than the non-foamed films 11A and 11C.
  • the base film 11 located at the position farthest from the protective film 2 in the first base material layer 3 is the foamed film 11B.
  • the base film 11 may be bonded to each other by an adhesive or an adhesive, or may be bonded to each other by various welding methods such as ultrasonic welding and heat welding.
  • the pressure-sensitive adhesive that bonds the base film 11 to each other may be in a layered form (adhesive layer). In this form, the flexibility of the pressure-sensitive adhesive layer can contribute to the improvement of peelability.
  • the pressure-sensitive adhesive layer may be a base-less double-sided pressure-sensitive adhesive tape.
  • adhesives are acrylic adhesives, silicone adhesives, urethane adhesives, epoxy adhesives and rubber adhesives.
  • acrylic pressure-sensitive adhesive or a silicone-based pressure-sensitive adhesive having excellent heat resistance, particularly a silicone-based pressure-sensitive adhesive is preferable to select an acrylic pressure-sensitive adhesive or a silicone-based pressure-sensitive adhesive having excellent heat resistance, particularly a silicone-based pressure-sensitive adhesive.
  • the base material and the single-sided adhesive tape or double-sided adhesive tape obtained by applying the adhesive on one or both sides of the base material may be used as the base film 11 and the pressure-sensitive adhesive layer.
  • An example of using the double-sided adhesive tape is shown in FIGS. 3 and 4.
  • the foamed film 11B is the base material of the double-sided adhesive tape 13.
  • the foamed film 11B and the non-foamed film 11A are joined by the pressure-sensitive adhesive layer 12A of the double-sided adhesive tape 13.
  • the cover member 1A of FIG. 3 is arranged on the surface 53 via the adhesive layer 12B of the double-sided adhesive tape 13.
  • the cover member 1A of FIG. 3 has the same configuration as the cover member 1A of FIGS. 1A and 1B except for these points.
  • the foamed film 11B is the base material of the double-sided adhesive tape 13.
  • the foamed film 11B and the non-foamed film 11C are joined by the pressure-sensitive adhesive layer 12A of the double-sided adhesive tape 13.
  • the non-foamed film 11A is the base material of the double-sided adhesive tape 15.
  • the non-foaming film 11C and the non-foaming film 11A are joined by the pressure-sensitive adhesive layer 14B of the double-sided adhesive tape 15.
  • the protective film 2 and the first base material layer 3 are bonded by an adhesive layer 14A of the double-sided adhesive tape 15.
  • the cover member 1A of FIG. 4 is arranged on the surface 53 via the adhesive layer 12B of the double-sided adhesive tape 13.
  • the cover member 1A of FIG. 4 has the same configuration as the cover member 1A of FIG. 2 except for these points.
  • the protective film 2 and the first base material layer 3 may be bonded by an adhesive or an adhesive, or may be bonded by the above-mentioned various welding methods.
  • the protective film 2 and the first base material layer 3 may be bonded by an adhesive layer 17 (see FIG. 5).
  • the flexibility of the pressure-sensitive adhesive layer can contribute to the improvement of peelability.
  • Examples of the pressure-sensitive adhesive and the pressure-sensitive adhesive layer are as described above.
  • the pressure-sensitive adhesive layer for joining the protective film 2 and the first base material layer 3 is a pressure-sensitive adhesive layer of a single-sided adhesive tape or a double-sided pressure-sensitive adhesive tape using the base material film 11 as a base material (for example, the pressure-sensitive adhesive layer 14A in FIG. 4). It may be.
  • the cover member 1A may be arranged on the surface 53 via the adhesive layer 16 included in the cover member 1A (see FIG. 5).
  • Examples of the pressure-sensitive adhesive layer are as described above.
  • the pressure-sensitive adhesive layer 16 may be a pressure-sensitive adhesive layer of a single-sided pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive tape using the base film 11 as a base material (for example, the pressure-sensitive adhesive layer 12B in FIGS. 3 and 4).
  • the shape of the cover member 1A is rectangular when viewed perpendicular to the main surface of the protective film 2.
  • the shape of the cover member 1 is not limited to this example.
  • the shape of the cover member 1 may be a polygon including squares and rectangles, a circle, and an ellipse when viewed perpendicular to the main surface of the protective film 2.
  • the corners of the polygon may be rounded (see FIG. 1B).
  • the first base material layer 3 of the cover member 1A has an outer circumference that coincides with the outer circumference of the protective film 2 when viewed perpendicularly to the main surface of the protective film 2. Further, the first base material layer 3 of the cover member 1A has a shape (frame shape) corresponding to the peripheral edge portion of the protective film 2 when viewed perpendicularly to the main surface of the protective film 2. The surface of the protective film 2 on the side of the first base material layer 3 is exposed in a region where the first base material layer 3 is not in contact. When the protective film 2 has air permeability in the thickness direction, the region can be used as the air permeability region of the cover member 1A. However, the shape of the first base material layer 3 is not limited to the above example.
  • the area of the ventilation region in the cover member 1 is, for example, 40 mm 2 or less.
  • the cover member 1 having an area of the ventilation region within the range is suitable for arrangement on an object having an opening having a small diameter, for example.
  • the lower limit of the area of the ventilation region is, for example, 0.008 mm 2 or more.
  • the area of the ventilation region may be a larger range depending on the type of the object on which the cover member 1 is arranged.
  • the thickness of the first base material layer 3 may be, for example, 50 to 1000 ⁇ m, 70 to 800 ⁇ m, and further 130 to 600 ⁇ m.
  • the foamed film 11B has closed cells. Therefore, the foamed film 11B can maintain its flexibility by suppressing the impregnation of the pressure-sensitive adhesive into the film even when the pressure-sensitive adhesive layer is provided on the surface, for example.
  • Examples of materials constituting the foamed film 11B are polyolefins such as polyethylene (PE) and polypropylene (PP), silicone resins, acrylic resins, and polyurethanes.
  • the material constituting the foamed film 11B is not limited to the above example.
  • the foamed film 11B does not have to have adhesiveness.
  • the non-foamed films 11A and 11C do not have closed cells.
  • the non-foamed films 11A and 11C may have air permeability in the thickness direction.
  • Examples of the non-foamed films 11A and 11C are metal films, resin films, non-woven fabrics, woven fabrics and papers.
  • the non-foamed films 11A and 11C are preferably resin films.
  • Examples of resins that can form the non-foamed films 11A and 11C are polyolefins such as PE and PP, polyesters such as polyethylene terephthalate (PET), silicone resins, polycarbonates, polyimides, polyamideimides, polyphenylene sulfides, and polyetheretherketones (PEEK). ), Polyvinyl chloride, and fluororesin.
  • Examples of fluororesins include polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and tetrafluoroethylene-ethylene copolymer. It is coalescence (ETFE).
  • the resin is not limited to the above example.
  • Examples of metals that can form the non-foamed films 11A and 11C are stainless steel and aluminum. However, the metal is not limited to the above example.
  • the non-foamed films 11A and 11C do not have to have adhesiveness.
  • the foamed film 11B and the non-foamed films 11A and 11C may have the same shape when viewed perpendicular to the first base material layer 3. Further, in the first base material layer 3, the outer circumferences of the base material films 11 may coincide with each other.
  • the thickness of the base film 11 is, for example, 10 to 250 ⁇ m.
  • the base film 11, particularly the non-foamed films 11A and 11C, may have higher strength than the protective film 2. In this case, damage to the protective film 2 at the time of peeling can be suppressed.
  • the strength can be evaluated as, for example, tensile breaking strength or cohesive breaking strength.
  • the protective film 2 may be non-breathable in the thickness direction or may have breathability in the thickness direction.
  • the arrangement of the cover member 1 can ensure air permeability through the opening of the object while preventing the passage of foreign matter. By ensuring ventilation, for example, it is possible to adjust the pressure through the opening and mitigate the fluctuation of the pressure.
  • the air permeability (air permeability in the thickness direction) of the protective film 2 having air permeability in the thickness direction is measured by the air permeability specified in Japanese Industrial Standards (former Japanese Industrial Standards; hereinafter referred to as "JIS") L1096. Displayed by the air permeability (hereinafter referred to as "Garley air permeability”) obtained in accordance with the B method (Garley type method), for example, it is less than 10,000 seconds / 100 mL.
  • Garley air permeability is 5000 seconds / 100 mL or less, 1000 seconds / 100 mL or less, 500 seconds / 100 mL or less, 100 seconds / 100 mL or less, 50 seconds / 100 mL or less, 10 seconds / 100 mL or less, and further 5 seconds / 100 mL or less. You may.
  • the lower limit of Garley air permeability is, for example, 0.2 seconds / 100 mL or more.
  • the air permeability of the protective film 2 that is non-breathable in the thickness direction is, for example, 10,000 seconds / 100 mL or more, expressed by the Garley air permeability.
  • Examples of materials constituting the protective film 2 are metals, resins, and composite materials thereof.
  • the examples of the resin and metal that can form the protective film 2 are the same as the examples of the resin and metal that can form the base film 11.
  • the resin constituting the protective film 2 may be PTFE.
  • the resin and the metal are not limited to the above examples.
  • the protective film 2 having air permeability in the thickness direction may include a stretched porous film.
  • the stretched porous membrane may be a fluororesin stretched porous membrane, particularly a PTFE stretched porous membrane.
  • the PTFE-stretched porous membrane is usually formed by stretching a paste extruded or cast membrane containing PTFE particles.
  • the PTFE stretched porous membrane is composed of fine fibrils of PTFE, and may have nodes in which PTFE is in an aggregated state as compared with fibrils. According to the PTFE stretched porous membrane, it is possible to achieve both the performance of preventing the invasion of foreign substances and the air permeability at a high level.
  • a known stretched porous film can be used as the protective film 2.
  • the protective film 2 having air permeability in the thickness direction may include a perforated film in which a plurality of through holes connecting both main surfaces are formed.
  • the perforated membrane may be a membrane having a non-porous substrate structure, for example, a non-porous membrane in which a plurality of through holes are provided.
  • the perforated membrane may not have a ventilation path in the thickness direction other than the plurality of through holes.
  • the through hole may extend in the thickness direction of the perforation membrane, or may be a straight hole extending linearly in the thickness direction.
  • the shape of the through-hole opening may be circular or elliptical when viewed perpendicular to the main surface of the perforated membrane.
  • the perforated membrane can be formed, for example, by laser processing the raw film, or by drilling by ion beam irradiation and subsequent chemical etching.
  • the protective film 2 having breathability in the thickness direction may include a non-woven fabric, a woven fabric, a mesh, and a net.
  • the protective film 2 may have a single-layer structure or a multilayer structure composed of two or more different layers.
  • An example of the protective film 2 having a multi-layer structure has a laminated structure of a PTFE-stretched porous film and a non-woven fabric.
  • the protective film 2 is not limited to the above example.
  • the shape of the protective film 2 of the cover member 1A is rectangular when viewed perpendicular to the main surface of the protective film 2.
  • the shape of the protective film 2 is not limited to the above example, and may be, for example, a polygon including a square and a rectangle, a circle, and an ellipse when viewed perpendicular to the main surface of the protective film 2.
  • the corners of the polygon may be rounded.
  • the thickness of the protective film 2 is, for example, 1 to 100 ⁇ m.
  • the cohesive force of the protective film 2 may be 2.0 N / 20 mm or less.
  • the cohesive force of the protective film 2 having high air permeability in the thickness direction tends to be low. Therefore, the conventional cover member provided with the protective film 2 having high air permeability in the thickness direction tends to damage the protective film 2 at the time of peeling.
  • the present invention is particularly advantageous when the cover member 1 includes a protective film 2 having high air permeability in the thickness direction.
  • the cohesive force of the protective film 2 may be 1.8 N / 20 mm or less, and further may be 1.5 N / 20 mm or less.
  • the protective film 2 having high air permeability in the thickness direction has an air permeability of 100 seconds / 100 mL or less, which is indicated by, for example, Garley air permeability.
  • the cohesive force of the protective film 2 can be measured by the method shown below with reference to the method for measuring the 180 ° peeling adhesive force defined in JIS Z0237: 2009.
  • the protective film 2 to be measured is cut out into a rectangle (length 100 mm ⁇ width 20 mm).
  • two double-sided adhesive tapes manufactured by Nitto Denko, No. 5610) having the same shape as the protective film 2 are prepared. Each double-sided adhesive tape is attached to one surface and the other surface of the protective film 2 with their outer circumferences aligned with each other.
  • two rectangular PET films (thickness 25 ⁇ m) having a length of 150 mm and a width of 20 mm are prepared. Each PET film is attached to one side and the other side of the protective film 2 by the double-sided adhesive tape.
  • both ends in the width direction of each PET film coincide with both ends in the width direction of the protective film 2, and both ends in the longitudinal direction of each PET film are perpendicular to the main surface of the PET film. As you can see, it is carried out so as not to overlap with the protective film 2 and the double-sided adhesive tape. However, as the length (longitudinal direction) of the free end portion of each PET film, a length (for example, 25 mm) at which the chuck of the tensile tester can stably grasp the PET film is secured.
  • the crimping roller with a load of 19.6 N is reciprocated once so that the crimping force is applied in the thickness direction of the laminated body of the PET film / double-sided adhesive tape / protective film 2 / double-sided adhesive tape / PET film. Then, leave it for at least 30 minutes before starting the tensile test to prepare a test piece.
  • a tensile tester for example, a desktop precision universal tester Autograph AGS-X manufactured by Shimadzu Corporation
  • the free end of one PET film at one end in the longitudinal direction of the test piece is fixed to the upper chuck of the tensile tester.
  • the free end of the other PET film at the other end in the longitudinal direction of the test piece is attached to the lower chuck.
  • the area of the protective film 2 is, for example, 175 mm 2 or less.
  • the cover member 1 in which the area of the protective film 2 is within the range is suitable for arrangement on an object having an opening having a small diameter, for example.
  • the lower limit of the area of the protective film 2 is, for example, 0.20 mm 2 or more.
  • the area of the protective film 2 may be a larger value depending on the type of the object on which the cover member 1 is arranged.
  • the area of the cover member 1 is, for example, 175 mm 2 or less.
  • the cover member 1 having an area within the range is suitable for placement on an object having an opening having a small diameter, for example.
  • the lower limit of the area of the cover member 1 is, for example, 0.20 mm 2 or more.
  • the area of the cover member 1 may be a larger value depending on the type of the object to be arranged. The smaller the area of the cover member 1, the more difficult it is to peel it off from the member supply sheet. Therefore, when the area of the cover member 1 is within the above range, the effect of the present invention becomes particularly remarkable.
  • the cover member 1 may include any layer and / or member other than those described above as long as the effects of the present invention can be obtained.
  • FIG. 6B is a plan view of the cover member 1 (1B) of FIG. 6A as viewed from the side of the second base material layer 4.
  • FIG. 6A shows a cross section AA of FIG. 6B.
  • 6A and 6B show the cover member 1B arranged on the surface 53 of the object 51.
  • the cover member 1B has the same configuration as the cover member 1A except that it further includes a second base material layer 4 including one or more base film 18.
  • the second base material layer 4 is joined to the other main surface of the protective film 2 and sandwiches the protective film 2 together with the first base material layer 3. In this form, damage to the protective film 2 at the time of peeling can be more reliably suppressed. Further, when the cover member 1 includes the tab film 5 described later, damage to the protective film 2 when the tab film 5 is peeled off can be suppressed.
  • the second base material layer 4 may include only the non-foaming film 18A composed of the non-foaming material as the base film 18.
  • the composition of the base film 18 and the non-foaming film 18A may be the same as the composition of the base film 11 and the non-foaming film 11A, respectively.
  • the configurations of the substrate films 11 and 18 closest to the protective film 2 in each of the first substrate layer 3 and the second substrate layer 4 may be the same. In this form, damage to the protective film 2 can be suppressed more reliably.
  • the second base material layer 4 may include two or more base material films 18.
  • the two or more base film 18s may have the same shape when viewed perpendicular to the second base material layer 4. Further, the outer circumferences of the two or more base film 18s may coincide with each other in the second base material layer 4. Two or more substrate films 18 are usually bonded to each other.
  • the joining method of the base film 18 may be the same as the joining method of the base film 11.
  • a single-sided adhesive tape or a double-sided adhesive tape obtained by applying an adhesive to one or both sides of the base material may be used as the base film 18 and the pressure-sensitive adhesive layer.
  • An example of using the double-sided adhesive tape is shown in FIG.
  • the second base material layer 4 of FIG. 7 includes two non-foaming films 18A and 18B as the base film 18.
  • the non-foamed film 18A is the base material of the double-sided adhesive tape 20.
  • the non-foaming film 18A and the non-foaming film 18B are joined by an adhesive layer 19A of the double-sided adhesive tape 20.
  • the protective film 2 and the second base material layer 4 are bonded by an adhesive layer 19B of the double-sided adhesive tape 20.
  • the cover member 1B of FIG. 7 has the same configuration as the cover member 1B of FIGS. 6A and 6B except for these points.
  • the protective film 2 and the second base material layer 4 may be bonded by an adhesive or an adhesive, or may be bonded by the above-mentioned various welding methods.
  • the protective film 2 and the second base material layer 4 may be bonded by an adhesive layer.
  • Examples of the pressure-sensitive adhesive and the pressure-sensitive adhesive layer are as described above.
  • the pressure-sensitive adhesive layer for joining the protective film 2 and the second base material layer 4 is a pressure-sensitive adhesive layer of a single-sided pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive tape using the base material film 18 as a base material (for example, the pressure-sensitive adhesive layer of FIG. 7). 19B) may be used.
  • the second base material layer 4 of the cover member 1B has an outer circumference that coincides with the outer circumference of the protective film 2 when viewed perpendicularly to the main surface of the protective film 2. Further, the second base material layer 4 of the cover member 1B has a shape (frame shape) corresponding to the peripheral edge portion of the protective film 2 when viewed perpendicularly to the main surface of the protective film 2. The surface of the protective film 2 on the side of the second base material layer 4 is exposed in the region where the second base material layer 4 is not in contact. When the protective film 2 has air permeability in the thickness direction, the region can be used as the air permeability region of the cover member 1. However, the shape of the second base material layer 4 is not limited to the above example.
  • the thickness of the second base material layer 4 is, for example, 10 to 700 ⁇ m, and may be 30 to 300 ⁇ m.
  • FIGS. 8A and 8B An example different from the above of the cover member of the present invention is shown in FIGS. 8A and 8B.
  • FIG. 8B is a plan view of the cover member 1 (1C) of FIG. 8A as viewed from the side of the tab film 5.
  • FIG. 8A shows a cross section AA of FIG. 8B.
  • 8A and 8B show the cover member 1C in a state of being arranged on the surface 53 of the object 51.
  • the cover member 1C has the same configuration as the cover member 1B except that the tab film 5 is further provided.
  • the tab film 5 is arranged on the outermost layer of the cover member 1.
  • the outermost layer is at the position farthest from the surface 53 when the cover member 1 is arranged on the surface 53.
  • the outermost layer of the example of FIGS. 8A and 8B is the base film 18 (18B) included in the second base material layer 4.
  • the tab film 5 has a tab 21 that protrudes outward from the outer periphery of the outermost layer when viewed perpendicularly to the main surface of the outermost layer.
  • the shape of the tab 21 of FIGS. 8A and 8B is rectangular when viewed perpendicular to the main surface of the tab film 5.
  • the shape of the tab 21 is not limited to this example.
  • the outside means the direction away from the center of the cover member 1 when viewed perpendicular to the main surface of the protective film 2.
  • the tab film 5 is usually removed when the cover member 1 is used.
  • the tab film 5 is removed after, for example, the cover member 1 is peeled off from the member supply sheet and placed on the surface 53 of the object 51. By gripping the tab 21, peeling from the sheet and / or removal of the tab film 5 may be performed.
  • the peeling force between the tab film 5 and the outermost layer may be larger than the peeling force between the sheet for supplying the member and the cover member 1.
  • the peeling force means a force required to peel one layer or member from two layers and / or members in a state of being joined to each other.
  • the cover member 1 can be peeled off from the member supply sheet, for example, by lifting or gripping the layer of the cover member 1 at the position farthest from the sheet.
  • the layer is, for example, a protective film 2 or a tab film 5.
  • the mode of peeling the cover member 1 is not limited to the above example.
  • the object 51 on which the cover member 1 is arranged is, for example, a housing of an electronic device.
  • the cover member 1 can be arranged on the outer surface and / or the inner surface of the housing of the electronic device.
  • the opening may be a vent and / or a sound passage provided in the housing of the electronic device.
  • electronic devices are wearable devices such as smart watches and wristbands; various cameras including action cameras and security cameras; information and communication devices such as mobile phones, smartphones and tablets; virtual reality (VR) devices; augmented reality (AR) ) Equipment; and sensor equipment.
  • VR virtual reality
  • AR augmented reality
  • electronic devices are not limited to this example.
  • the foreign matter that is prevented from passing by the arrangement of the cover member 1 is, for example, particles such as dust and liquid water such as water droplets.
  • the cover member 1 is arranged on the inner surface 54 of the housing 51 of the electronic device which is the object.
  • the housing 51 is provided with an opening 52, and the cover member 1 is arranged on the inner surface 54 so that the protective film 2 covers the opening 52.
  • the first base material layer 3 is located between the protective film 2 and the inner surface 54 in a state where the cover member 1 is arranged on the inner surface 54.
  • the second base material layer 4 faces the space inside the housing 51.
  • the first base material layer 3 surrounds the opening 52 when viewed perpendicular to the inner surface 54.
  • the protective film 2 prevents the passage of foreign matter through the opening 52.
  • the cover member 1 can function as a member that prevents the passage of foreign matter while ensuring the transmission of sound through the opening 52. Further, when the protective film 2 has air permeability in the thickness direction, ventilation through the protective film 2 is ensured. At this time, the cover member 1 can function as a member that prevents the passage of foreign matter while ensuring ventilation through the opening 52.
  • the second base material layer 4 is in contact with the semiconductor element 55. Except for this point, it is the same as the example of FIG.
  • the semiconductor element 55 is arranged inside the housing 51.
  • the semiconductor element 55 may be provided with an opening for ventilation and / or sound transmission.
  • the second base material layer 4 may surround the opening when viewed perpendicularly to the surface of the semiconductor element 55 having the opening.
  • Examples of the semiconductor element 55 are various sensor elements that detect atmospheric pressure, humidity, gas, airflow, acceleration, and the like, and acoustic conversion elements such as speakers and microphones.
  • the cover member 1 can function as a member that prevents foreign matter from passing from the outside of the housing 51 to the semiconductor element 55 while ensuring ventilation and / or sound transmission through the openings 52 and the openings of the semiconductor element 55.
  • the mode in which the cover member 1 is used is not limited to the above example.
  • the cover member 1 can be formed by, for example, shaping and laminating the protective film 2, the base films 11 and 18, and the tab film 5.
  • the cover member 1 can be supplied by a sheet for supplying members.
  • FIG. 11 shows an example of the member supply assembly which is the supply mode of the cover member 1 by the sheet.
  • the member supply assembly 41 of FIG. 11 includes a sheet 31 for supplying members and one or more cover members 1 arranged on the sheet 31. In each cover member 1, the first base material layer 3 faces the sheet 31. According to the member supply assembly 41, for example, the cover member 1 can be efficiently supplied to the process of arranging the cover member 1 on the surface of the object.
  • FIG. 12 and 13 show an example of the arrangement of the cover member 1 on the seat 31.
  • the cover member 1A of FIG. 1A is arranged on the seat 31.
  • the cover member 1C of FIG. 8A is arranged on the seat 31.
  • An adhesive layer 16 (see FIG. 5) can be used for arranging the cover member 1 on the sheet 31.
  • the cover member 1 may be arranged on the sheet 31 via an adhesive layer provided on the arrangement surface of the cover member 1 on the sheet 31.
  • the pressure-sensitive adhesive layer on the arrangement surface is preferably weakly adhesive.
  • Examples of materials constituting the sheet 31 are paper, metal, resin, and composite materials thereof.
  • the metal is, for example, stainless steel and aluminum.
  • the resin is, for example, polyester such as PET and polyolefin such as PE and PP.
  • the material constituting the sheet 31 is not limited to the above example.
  • the thickness of the sheet 31 is, for example, 1 to 250 ⁇ m.
  • the member supply assembly 41 of FIG. 11 includes a rectangular seat 31 when viewed perpendicular to the main surface of the seat 31.
  • the shape of the sheet 31 is not limited to this example.
  • the shape of the sheet 31 may be a polygon other than a rectangle (for example, a square), a circle, an ellipse, or a band when viewed perpendicular to the main surface of the sheet 31.
  • the corners of the polygon may be rounded.
  • a plurality of cover members 1 are regularly arranged and arranged on the sheet 31. More specifically, the plurality of cover members 1 are arranged at the intersections of virtual grids on the arrangement surface.
  • the form of arrangement of the cover member 1 in the member supply assembly 41 is not limited to the above example.
  • the member supply assembly 41 of FIG. 11 is rectangular when viewed perpendicular to the main surface of the assembly 41.
  • the shape of the member supply assembly 41 is not limited to the above example.
  • the shape of the member supply assembly 41 may be a polygon other than a rectangle (for example, a square), a circle, an ellipse, or a band when viewed perpendicular to the main surface of the assembly 41.
  • the corners of the polygon may be rounded.
  • the shape of the member supply assembly 41 may be the same as the shape of the sheet 31.
  • the strip-shaped member supply assembly 41 typically includes a strip-shaped sheet 31.
  • the strip-shaped member supply assembly 41 may be a wound body (may be wound to form a wound body).
  • the strip-shaped member supply assembly 41 may be wound around a winding core to form a winding body.
  • the member supply assembly 41 can be manufactured by arranging the cover member 1 on the seat 31.
  • the protective film is not damaged such as cracks and the cover member can be peeled off without bending the sheet for supplying the member ( ⁇ ).
  • the cover member It is inferior ( ⁇ ) when it is necessary to bend the sheet for supplying members (bending with the arrangement surface of the cover member as the outer surface) for peeling, and even though the sheet for supplying members is bent, it cracks during peeling.
  • the protective film is damaged, such as is not possible (x).
  • the peeled cover member was attached to the surface of the polycarbonate plate via the first base material layer.
  • the tab was gripped with tweezers to peel the tab film from the second base material layer.
  • the case where the protective film was damaged such as a crack was regarded as damaged (x), and the case where it did not occur was regarded as no damage ( ⁇ ).
  • peeling force between the first base material layer and the sheet for supplying members The peeling force between the first base material layer and the sheet for supplying members is determined by the method for measuring the 180 ° peeling adhesive force specified in JIS Z0237: 2009, separately from the production of the cover members of Examples and Comparative Examples. Based on this, the evaluation was made as follows.
  • a sheet for supplying members used for each cover member and a double-sided adhesive tape in contact with the sheet in each cover member were prepared.
  • the sheet and the double-sided adhesive tape were bonded together in an atmosphere of a temperature of 23 ° C. and a humidity of 65% RH, and left in the atmosphere for 24 hours to stabilize the bonding between the two.
  • a crimping roller having a mass of 2 kg was reciprocated once.
  • a laminated body of the sheet and the double-sided adhesive tape was cut out into a rectangle (length 120 mm ⁇ width 30 mm) to obtain a test piece.
  • a 180 ° peeling test was conducted to peel off the double-sided adhesive tape from the sheet, and the 180 ° peeling adhesive strength (180 ° peeling adhesive strength) Unit: N / 30 mm) was measured.
  • the tensile tester a desktop precision universal tester Autograph AGS-X (manufactured by Shimadzu Corporation) was used. The obtained 180 ° peeling adhesive force was used as the peeling force between the first base material layer and the sheet.
  • [Cover member including the first base material layer] (Example 1) ⁇ Preparation of protective film> 100 parts by weight of PTFE fine powder (manufactured by Daikin Industries, Ltd., Polyflon PTFE F-104) and 20 parts by weight of n-dodecane (manufactured by Japan Energy) as a molding aid were uniformly mixed. The obtained mixture was compressed using a cylinder and then ram extrusion molded to form a sheet-like mixture. Next, the sheet-like mixture was rolled through a pair of metal rolls to a thickness of 0.2 mm, and the molding aid was further removed by heating at 150 ° C. to form a PTFE sheet molded product.
  • PTFE fine powder manufactured by Daikin Industries, Ltd., Polyflon PTFE F-104
  • n-dodecane manufactured by Japan Energy
  • the formed sheet molded product was stretched in the longitudinal direction at a stretching temperature of 260 ° C. and a stretching ratio of 1.5 times.
  • the film was stretched in the width direction at a stretching temperature of 150 ° C. and a stretching ratio of 6.5 times, and further fired at 360 ° C. for 10 minutes to obtain a protective film A which is a PTFE-stretched porous film.
  • the cohesive force of the protective film A was 2.0 N / 20 mm.
  • the cohesive force of the protective film A was evaluated by the above method.
  • a non-woven fabric (thickness 270 ⁇ m, basis weight 70 g / m 2 ) was bonded to one main surface of the protective film A to obtain a protective film B.
  • This non-woven fabric was made of a composite fiber having a core-sheath structure with PET as a core and polyethylene as a sheath.
  • the protective film A and the non-woven fabric were joined by thermal lamination (temperature 200 ° C., pressure 0.2 MPa).
  • Double-sided adhesive tape A (Nitto Denko, No. 57120B, thickness 100 ⁇ m), PET film A (Toray, Lumirror # 25S10, thickness 25 ⁇ m, non-foaming) and double-sided adhesive tape B (Nitto Denko, No. 5603, A laminated body having a thickness of 30 ⁇ m) (each layer is arranged in this order) was prepared.
  • the base material of the double-sided adhesive tape A was a PE foam film (thickness 60 ⁇ m).
  • the base material of the double-sided adhesive tape B was a PET non-foamed film (thickness 12.5 ⁇ m).
  • the laminated body was punched into a frame shape having an outer shape of 11 mm ⁇ 10 mm and an inner shape of 6.8 mm ⁇ 3.8 mm to obtain a first base material layer A.
  • the first base material layer A includes a two-layer non-foaming film and a one-layer foamed film as the base film.
  • the adhesives of the double-sided adhesive tapes A and B were acrylic.
  • PET sheet manufactured by nippers, PET75x1-JOL, thickness 75 ⁇ m
  • the sheet was a rectangle having a length of 160 mm and a width of 60 mm.
  • the protective film B and the first base material layer A were joined by the double-sided adhesive tape B of the first base material layer A.
  • the bonding was carried out so that the double-sided adhesive tape B and the PTFE stretched porous film were in contact with each other.
  • the entire surface was punched into a rectangle having an outer diameter of 9 mm ⁇ 6 mm to obtain a cover member of Example 1.
  • the punching process was carried out so that the center of the inner shape of the first base material layer A, which had a frame shape, coincided with the center of the entire surface after the process.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape A. In this state, among the base films included in the first base material layer A, the foamed film which is the base material of the double-sided adhesive tape A is located at the position closest to the protective film B and the sheet for supplying the member. It was.
  • Example 2 As the non-woven fabric to be bonded to the protective film A, except that a non-woven fabric (thickness 105 ⁇ m, grain 30 g / m 2 ) made of a composite fiber having a core-sheath structure with PET as a core and a low melting point copolymer polyester as a sheath was used.
  • a cover member was obtained in the same manner as in Example 1.
  • the protective film provided on the cover member of the second embodiment is referred to as the protective film C.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape A of the first base material layer A.
  • a cover member was obtained in the same manner as in Example 1 except that the first base material layer B was used instead of the first base material layer A.
  • Double-sided adhesive tape C (Nitto Denko, No. 5610, thickness 100 ⁇ m) was used for the first base material layer B.
  • the base material of the double-sided adhesive tape C was a PET non-foamed film (thickness 50 ⁇ m).
  • the first base material layer B provided a single layer of non-foamed film as a base film.
  • the adhesive of the double-sided adhesive tape C was an acrylic type.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape C of the first base material layer B.
  • Example 2 A cover member was obtained in the same manner as in Example 2 except that the first base material layer C was used instead of the first base material layer A. Double-sided adhesive tape A was used for the first base material layer C. The first base material layer C provided a one-layer foamed film as a base film. The cover member was placed on the member supply sheet via the double-sided adhesive tape A of the first base material layer C.
  • Comparative Example 3 A cover member was obtained in the same manner as in Example 2 except that the first base material layer B was used instead of the first base material layer A.
  • the cover member of Comparative Example 3 was arranged on the sheet for supplying the member via the double-sided adhesive tape C of the first base material layer B.
  • Table 1 shows the structure of the first base material layer.
  • Table 2 shows the configurations and evaluation results of Examples 1 and 2 and Comparative Examples 1 to 3.
  • “Foam” and “non-foam” in Table 1 indicate that the base material of the double-sided adhesive tape is a foam film and a non-foam film, respectively.
  • the cover member of the example in which the first base material layer includes the non-foamed film and the foamed film was superior in peelability as compared with the cover member of the comparative example.
  • the first base material layer A was bonded to one surface of the protective film A with the double-sided adhesive tape B of the first base material layer A.
  • the second base material layer A was bonded to the other surface of the protective film A with the double-sided adhesive tape C of the second base material layer A.
  • the joining of the second base material layer A was carried out so that the inner shapes of the first base material layer A and the second base material layer, which are frame-shaped, match each other when viewed perpendicular to the main surface of the protective film A. ..
  • the entire surface was punched into a rectangle having an outer diameter of 9 mm ⁇ 6 mm to obtain a cover member.
  • the punching process was carried out so that the center of the inner shape of the first base material layer A and the second base material layer A became the center of the whole after the processing.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape A of the first base material layer A.
  • the foamed film which is the base material of the double-sided adhesive tape A is located at the position closest to the protective film A and the sheet for supplying the member. It was.
  • Example 4 A cover member was obtained in the same manner as in Example 3 except that the second base material layer B was used instead of the second base material layer A.
  • the second base material layer B a laminate of double-sided adhesive tape B and PET film B was used.
  • the second base material layer B was bonded to the protective film A by the double-sided adhesive tape B of the second base material layer B.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape A of the first base material layer A. In this state, among the base films included in the first base material layer A, the foamed film which is the base material of the double-sided adhesive tape A is located at the position closest to the protective film A and the sheet for supplying the member. It was.
  • Example 5 A cover member was obtained in the same manner as in Example 4 except that the first base material layer D was used instead of the first base material layer A.
  • a double-sided adhesive tape D manufactured by Nitto Denko, No. 57115B, thickness 150 ⁇ m
  • the base material of the double-sided adhesive tape D was a polyethylene foam film (thickness 80 ⁇ m).
  • the first base material layer D includes a two-layer non-foaming film and a one-layer foamed film as the base film.
  • the adhesive of the double-sided adhesive tape D was an acrylic type.
  • the first base material layer D was bonded to the protective film A by the double-sided adhesive tape B of the first base material layer D.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape D of the first base material layer D.
  • the foamed film which is the base material of the double-sided adhesive tape D is located at the position closest to the protective film A and the sheet for supplying the member. It was.
  • Example 6 A cover member was obtained in the same manner as in Example 4 except that the first base material layer E was used instead of the first base material layer A.
  • a double-sided adhesive tape E manufactured by Nitto Denko, No. 57120B, thickness 200 ⁇ m
  • the base material of the double-sided adhesive tape E was a polyethylene foam film (thickness 100 ⁇ m).
  • the first base material layer E includes a two-layer non-foaming film and a one-layer foamed film as the base film.
  • the adhesive of the double-sided adhesive tape E was an acrylic type.
  • the first base material layer E was bonded to the protective film A by the double-sided adhesive tape B of the first base material layer E.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape E of the first base material layer E.
  • the foamed film which is the base material of the double-sided adhesive tape E is located at the position closest to the protective film A and the sheet for supplying the member. It was.
  • Example 7 A cover member was obtained in the same manner as in Example 4 except that the first base material layer F was used instead of the first base material layer A.
  • a laminate of double-sided adhesive tape A and double-sided adhesive tape B was prepared for the first base material layer F.
  • the first base material layer F includes one layer of non-foaming film and one layer of foamed film as the base film.
  • the first base material layer F was bonded to the protective film A by the double-sided adhesive tape B of the first base material layer F.
  • the cover member was placed on the member supply sheet via the double-sided adhesive tape A of the first base material layer F. In this state, among the base films included in the first base material layer F, the foamed film which is the base material of the double-sided adhesive tape A is located at the position closest to the protective film A and the sheet for supplying members. It was.
  • Example 4 A cover member was obtained in the same manner as in Example 3 except that the first base material layer B was used instead of the first base material layer A. The cover member was placed on the member supply sheet via the double-sided adhesive tape C of the first base material layer B.
  • Example 5 A cover member was obtained in the same manner as in Example 3 except that the first base material layer C was used instead of the first base material layer A. The cover member was placed on the member supply sheet via the double-sided adhesive tape A of the first base material layer B.
  • the configurations of the first base material layer and the second base material layer are shown in Tables 3 and 4, respectively.
  • Table 5 shows the configurations and evaluation results of Examples 3 to 7 and Comparative Examples 4 and 5.
  • “Foam” and “non-foam” in Table 3 indicate that the base material of the double-sided adhesive tape is a foam film and a non-foam film, respectively.
  • the cover member of the example in which the first base material layer includes the non-foamed film and the foamed film was superior in peelability as compared with the cover member of the comparative example.
  • the protective film was damaged when the tab film was peeled off. It is presumed that this is because the first base material layer is excessively flexible, so that the protective film is deformed greatly when the tab film is peeled off, and the protective film is coagulated and fractured. Since the protective film of the cover member of Comparative Example 4 was damaged when it was peeled from the film for supplying the member, it was not possible to evaluate whether or not the protective film was damaged when the tab film was peeled off.
  • the cover member of the present invention can be used for the same purposes as a conventional cover member provided with a protective film.

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Abstract

本発明のカバー部材は、開口を有する面を持つ対象物の当該面に配置されて、上記開口における異物の通過を防ぐ部材であって、当該カバー部材が上記面に配置されたときに上記開口を覆う形状を有する保護膜と、保護膜の一方の主面に接合された第１基材層とを備える。第１基材層は、２以上の基材フィルムを含む積層構造を有すると共に、カバー部材が上記面に配置されたときに保護膜と上記面との間に位置する。前記２以上の基材フィルムは、非発泡フィルムと発泡フィルムとを備える。本発明のカバー部材は、部材供給用のシートからの剥離性の改善に適している。

Description

カバー部材及びこれを備える部材供給アセンブリ
　本発明は、開口を有する面を持つ対象物の当該面に配置されて上記開口における異物の通過を防ぐカバー部材と、当該部材を供給するための部材供給アセンブリとに関する。
　開口を有する面を持つ対象物の当該面に配置されて、上記開口における異物の通過を防ぐカバー部材が知られている。特許文献１には、防水通気膜と、防水通気膜の表面の周縁部に接合された第１両面粘着テープと、防水通気膜の上記表面とは反対側の表面の周縁部に接合された第２両面粘着テープと、を備え、第１両面粘着テープの基材が発泡体である防水通気部材が開示されている。
国際公開第２０１５／０６４０２８号
　カバー部材は、通常、ライナーシート等の部材供給用のシートに配置された状態で供給される。当該状態で供給されたカバー部材は、シートから剥離した後に、対象物の面に配置される。このとき、カバー部材におけるシートから最も離れた層を吸着や把持により持ち上げることでカバー部材をシートから剥離させ、そのまま対象物の面にカバー部材を配置すると効率的である。最も離れた層は、例えば、保護膜やタブフィルムである。しかし、シートからのカバー部材の剥離性が低いと、カバー部材を持ち上げる力が集中して保護膜が破損することがある。破損は、厚さ方向に高い通気性を有する保護膜を備えたカバー部材において特に生じやすい。
　本発明は、部材供給用のシートからの剥離性に優れるカバー部材の提供を目的とする。
　本発明は、
　開口を有する面を持つ対象物の当該面に配置されて、前記開口における異物の通過を防ぐカバー部材であって、
　前記カバー部材が前記面に配置されたときに前記開口を覆う形状を有する保護膜と、
　前記保護膜の一方の主面に接合された第１基材層と、を備え、
　前記第１基材層は、２以上の基材フィルムを含む積層構造を有すると共に、前記カバー部材が前記面に配置されたときに前記保護膜と前記面との間に位置し、
　前記２以上の基材フィルムは、非発泡フィルムと発泡フィルムとを備えるカバー部材、
　を提供する。
　別の側面から、本発明は、
　部材供給用のシートと、前記シート上に配置されたカバー部材と、を備え、
　前記カバー部材は、上記本発明のカバー部材であり、
　前記カバー部材の前記第１基材層が前記シートに面している、部材供給アセンブリ、
　を提供する。
　本発明のカバー部材では、非発泡フィルム及び発泡フィルムを含む２以上の基材フィルムの積層構造を有する第１基材層が、保護膜に接合されている。第１基材層は、対象物の面に配置されたときに保護膜と当該面との間に位置する。ここで、ライナーシート等の部材供給用のシートにより供給されたカバー部材は、通常、シートに接していた側が対象物の面に接するように配置される。このため、シートによる供給時には、第１基材層がシート側に位置している。シートからの剥離時には、カバー部材を折り曲げようとする力が働く。この力によりカバー部材が過度に変形すると、剥離が難しくなり、保護膜が破損しやすくなる。しかし、部材がある程度折り曲がらなければ、剥離はスムーズに進行しない。本発明のカバー部材は、相対的に剛直であって、過度の変形を防ぎながら部材を剥離する力として上記力を効率的にカバー部材に伝達できる非発泡フィルムと、相対的に柔軟であって、シート側に位置する第１基材層の適度な変形を許容する発泡フィルムと、を第１基材層に備えている。本発明のカバー部材は、部材供給用のシートからの剥離性の改善に適した構造を有する。
図１Ａは、本発明のカバー部材の一例を模式的に示す断面図である。 図１Ｂは、図１Ａのカバー部材を保護膜の側から見た平面図である。 図２は、本発明のカバー部材の別の一例を模式的に示す断面図である。 図３は、本発明のカバー部材のまた別の一例を模式的に示す断面図である。 図４は、本発明のカバー部材の更にまた別の一例を模式的に示す断面図である。 図５は、本発明のカバー部材の上記とは別の一例を模式的に示す断面図である。 図６Ａは、本発明のカバー部材の上記とは別の一例を模式的に示す断面図である。 図６Ｂは、図６Ａのカバー部材を第２基材層の側から見た平面図である。 図７は、本発明のカバー部材の上記とは別の一例を模式的に示す断面図である。 図８Ａは、本発明のカバー部材の上記とは別の一例を模式的に示す断面図である。 図８Ｂは、図８Ａのカバー部材をタブフィルムの側から見た平面図である。 図９は、本発明のカバー部材の対象物への配置の一例を示す模式図である。 図１０は、本発明のカバー部材の対象物への配置の別の一例を示す模式図である。 図１１は、本発明の部材供給アセンブリの一例を模式的に示す平面図である。 図１２は、部材供給用のシートに対する本発明のカバー部材の配置の一例を模式的に示す断面図である。 図１３は、部材供給用のシートに対する本発明のカバー部材の配置の別の一例を模式的に示す断面図である。
　以下、本発明の実施形態について、図面を参照しながら説明する。本発明は、以下の実施形態に限定されない。
　［カバー部材］
　本発明のカバー部材の一例を図１Ａ及び図１Ｂに示す。図１Ｂは、図１Ａのカバー部材１（１Ａ）を保護膜２の側から見た平面図である。図１Ａには、図１Ｂの断面Ａ－Ａが示されている。カバー部材１Ａは、開口５２を有する面５３を持つ対象物５１の面５３に配置されて、開口５２における異物の通過を防ぐ部材である。図１Ａ及び図１Ｂには、対象物５１の面５３に配置された状態にあるカバー部材１Ａが示されている。
　カバー部材１Ａは、保護膜２と、保護膜２の一方の主面に接合された第１基材層３とを備える。カバー部材１Ａは、保護膜２及び第１基材層３を含む積層体から構成される。保護膜２は、カバー部材１Ａが面５３に配置されたときに開口５２を覆う形状を有する。第１基材層３は、カバー部材１Ａが面５３に配置されたときに、保護膜２と面５３との間に位置している。
　第１基材層３は、２つの基材フィルム１１を含む積層構造を有する。第１基材層３は、基材フィルム１１として、非発泡体により構成される非発泡フィルム１１Ａと、発泡体により構成される発泡フィルム１１Ｂとを備える。発泡フィルム１１Ｂは、非発泡フィルム１１Ａよりも保護膜２から離れた位置にある。この形態では、カバー部材１Ａの剥離時に、発泡フィルム１１Ｂによる第１基材層３の変形がより適度となり、カバー部材１Ａの剥離性を向上できる。また、第１基材層３において保護膜２から最も離れた位置にある基材フィルム１１は、発泡フィルム１１Ｂである。この形態では、上記適度な変形に基づく剥離性の向上がより確実となる。
　ただし、第１基材層３の積層構造は、２以上の基材フィルム１１として非発泡フィルム１１Ａ及び発泡フィルム１１Ｂを含む限り、上記例に限定されない。第１基材層３は、２以上の非発泡フィルム１１Ａ及び／又は２以上の発泡フィルム１１Ｂを備えていてもよい。第１基材層３の構成が異なる変形例を図２に示す。
　図２のカバー部材１Ａは、第１基材層３の構成が異なる以外は、図１Ａ及び図１Ｂのカバー部材１Ａと同様の構成を有する。図２の第１基材層３は、２つの非発泡フィルム１１Ａ，１１Ｃと、１つの発泡フィルム１１Ｂとを基材フィルム１１として備える。非発泡フィルム１１Ａ，１１Ｃ及び発泡フィルム１１Ｂは、この順に積層されている。発泡フィルム１１Ｂは、非発泡フィルム１１Ａ，１１Ｃよりも保護膜２から離れた位置にある。第１基材層３において保護膜２から最も離れた位置にある基材フィルム１１は、発泡フィルム１１Ｂである。
　第１基材層３における２以上の基材フィルム１１は、通常、互いに接合されている。基材フィルム１１は、粘着剤又は接着剤によって互いに接合されていてもよいし、超音波溶着や熱溶着等の各種の溶着法によって互いに接合されていてもよい。基材フィルム１１を互いに接合する粘着剤は層状（粘着剤層）であってもよい。この形態では、粘着剤層の柔軟性が剥離性の向上に寄与しうる。粘着剤層は、基材レスの両面粘着テープであってもよい。
　粘着剤の例は、アクリル系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤、エポキシ系粘着剤及びゴム系粘着剤である。高温下でのカバー部材１Ａの使用を考慮する必要がある場合には、耐熱性に優れるアクリル系粘着剤又はシリコーン系粘着剤、特にシリコーン系粘着剤、を選択することが好ましい。
　基材と、当該基材の片面又は両面に粘着剤が塗布されてなる片面粘着テープ又は両面粘着テープを、基材フィルム１１及び粘着剤層として使用してもよい。両面粘着テープを使用した例を図３及び図４に示す。
　図３の第１基材層３では、発泡フィルム１１Ｂは両面粘着テープ１３の基材である。発泡フィルム１１Ｂと非発泡フィルム１１Ａとは、両面粘着テープ１３の粘着剤層１２Ａによって接合されている。また、図３のカバー部材１Ａは、両面粘着テープ１３の粘着剤層１２Ｂを介して面５３に配置されている。図３のカバー部材１Ａは、これらの点以外は、図１Ａ及び図１Ｂのカバー部材１Ａと同様の構成を有する。
　図４の第１基材層３では、発泡フィルム１１Ｂは両面粘着テープ１３の基材である。発泡フィルム１１Ｂと非発泡フィルム１１Ｃとは、両面粘着テープ１３の粘着剤層１２Ａによって接合されている。非発泡フィルム１１Ａは両面粘着テープ１５の基材である。非発泡フィルム１１Ｃと非発泡フィルム１１Ａとは、両面粘着テープ１５の粘着剤層１４Ｂによって接合されている。また、保護膜２と第１基材層３とは、両面粘着テープ１５の粘着剤層１４Ａによって接合されている。図４のカバー部材１Ａは、両面粘着テープ１３の粘着剤層１２Ｂを介して面５３に配置されている。図４のカバー部材１Ａは、これらの点以外は、図２のカバー部材１Ａと同様の構成を有する。
　保護膜２と第１基材層３とは、粘着剤又は接着剤によって接合されていてもよいし、上記各種の溶着法によって接合されていてもよい。保護膜２と第１基材層３とは粘着剤層１７によって接合されていてもよい（図５参照）。この形態では、粘着剤層の柔軟性が剥離性の向上に寄与しうる。粘着剤及び粘着剤層の例は、上述のとおりである。保護膜２と第１基材層３とを接合する粘着剤層は、基材フィルム１１を基材とする片面粘着テープ又は両面粘着テープの粘着剤層（例えば、図４の粘着剤層１４Ａ）であってもよい。
　カバー部材１Ａは、カバー部材１Ａが備える粘着剤層１６を介して面５３に配置されてもよい（図５参照）。粘着剤層の例は、上述のとおりである。また、粘着剤層１６は、基材フィルム１１を基材とする片面粘着テープ又は両面粘着テープの粘着剤層（例えば、図３，４の粘着剤層１２Ｂ）であってもよい。
　カバー部材１Ａの形状は、保護膜２の主面に垂直に見て、長方形である。ただし、カバー部材１の形状は、この例に限定されない。カバー部材１の形状は、保護膜２の主面に垂直に見て、正方形及び長方形を含む多角形、円、並びに楕円であってもよい。多角形の角は、丸められていてもよい（図１Ｂ参照）。
　カバー部材１Ａの第１基材層３は、保護膜２の主面に垂直に見て、保護膜２の外周に一致する外周を有している。また、カバー部材１Ａの第１基材層３は、保護膜２の主面に垂直に見て、保護膜２の周縁部に対応する形状（額縁状）を有している。保護膜２の第１基材層３側の面は、第１基材層３が接していない領域において露出している。保護膜２が厚さ方向の通気性を有する場合には、当該領域をカバー部材１Ａの通気領域とすることができる。ただし、第１基材層３の形状は、上記例に限定されない。
　カバー部材１における通気領域の面積は、例えば、４０ｍｍ2以下である。通気領域の面積が当該範囲にあるカバー部材１は、例えば、小径の開口を有する対象物への配置に適している。通気領域の面積の下限は、例えば、０．００８ｍｍ2以上である。ただし、通気領域の面積は、カバー部材１が配置される対象物の種類によっては、より大きな範囲であってもよい。
　第１基材層３の厚さは、例えば、５０～１０００μｍであり、７０～８００μｍ、更には１３０～６００μｍであってもよい。
　発泡フィルム１１Ｂは、独立気泡を有する。このため、発泡フィルム１１Ｂは、例えば粘着剤層が表面に設けられた場合においても、フィルム内部への粘着剤の含浸が抑制されることで柔軟性を維持できる。
　発泡フィルム１１Ｂを構成する材料の例は、ポリエチレン（ＰＥ）及びポリプロピレン（ＰＰ）等のポリオレフィン、シリコーン樹脂、アクリル樹脂、並びにポリウレタンである。ただし、発泡フィルム１１Ｂを構成する材料は、上記例に限定されない。
　発泡フィルム１１Ｂは、接着性を有さなくてもよい。
　非発泡フィルム１１Ａ，１１Ｃは、独立気泡を有さない。非発泡フィルム１１Ａ，１１Ｃは、厚さ方向の通気性を有していてもよい。非発泡フィルム１１Ａ，１１Ｃの例は、金属フィルム、樹脂フィルム、不織布、織布及び紙である。非発泡フィルム１１Ａ，１１Ｃは、樹脂フィルムが好ましい。
　非発泡フィルム１１Ａ，１１Ｃを構成しうる樹脂の例は、ＰＥ及びＰＰ等のポリオレフィン、ポリエチレンテレフタレート（ＰＥＴ）等のポリエステル、シリコーン樹脂、ポリカーボネート、ポリイミド、ポリアミドイミド、ポリフェニレンサルファイド、ポリエーテルエーテルケトン（ＰＥＥＫ）、ポリ塩化ビニル、並びにフッ素樹脂である。フッ素樹脂の例は、ポリテトラフルオロエチレン（ＰＴＦＥ）、テトラフルオロエチレン－パーフルオロアルキルビニルエーテル共重合体（ＰＦＡ）、テトラフルオロエチレン－ヘキサフルオロプロピレン共重合体（ＦＥＰ）、テトラフルオロエチレン－エチレン共重合体（ＥＴＦＥ）である。ただし、樹脂は上記例に限定されない。
　非発泡フィルム１１Ａ，１１Ｃを構成しうる金属の例は、ステンレス及びアルミニウムである。ただし、金属は上記例に限定されない。
　非発泡フィルム１１Ａ，１１Ｃは、接着性を有さなくてもよい。
　発泡フィルム１１Ｂ及び非発泡フィルム１１Ａ，１１Ｃは、第１基材層３に垂直に見て、同じ形状を有していてもよい。また、第１基材層３において各基材フィルム１１の外周は、互いに一致していてもよい。
　基材フィルム１１の厚さは、例えば、１０～２５０μｍである。
　基材フィルム１１、特に非発泡フィルム１１Ａ，１１Ｃ、は、保護膜２に比べて高い強度を有していてもよい。この場合、剥離時における保護膜２の破損を抑制できる。強度は、例えば、引張破断強度又は凝集破壊強度として評価できる。
　保護膜２は、厚さ方向に非通気性であっても、厚さ方向の通気性を有していてもよい。保護膜２が厚さ方向の通気性を有する場合、カバー部材１の配置により、対象物の開口における異物の通過を防ぎながら当該開口を介した通気を確保できる。通気の確保により、例えば、開口を介した圧力の調整や圧力の変動の緩和が可能となる。
　厚さ方向の通気性を有する保護膜２の通気度（厚さ方向の通気度）は、日本産業規格（旧日本工業規格；以下、「ＪＩＳ」と記載する）Ｌ１０９６に定められた通気性測定Ｂ法（ガーレー形法）に準拠して求めた空気透過度（以下、「ガーレー通気度」と記載）により表示して、例えば１万秒／１００ｍＬ未満である。ガーレー通気度は、５０００秒／１００ｍＬ以下、１０００秒／１００ｍＬ以下、５００秒／１００ｍＬ以下、１００秒／１００ｍＬ以下、５０秒／１００ｍＬ以下、１０秒／１００ｍＬ以下、更には５秒／１００ｍＬ以下であってもよい。ガーレー通気度の下限は、例えば、０．２秒／１００ｍＬ以上である。
　厚さ方向に非通気性である保護膜２の通気度は、ガーレー通気度により表示して、例えば１万秒／１００ｍＬ以上である。
　保護膜２を構成する材料の例は、金属、樹脂及びこれらの複合材料である。
　保護膜２を構成しうる樹脂及び金属の例は、基材フィルム１１を構成しうる樹脂及び金属の例と同じである。保護膜２を構成する樹脂は、ＰＴＦＥであってもよい。ただし、樹脂及び金属は、上記例に限定されない。
　厚さ方向の通気性を有する保護膜２は、延伸多孔質膜を含んでいてもよい。延伸多孔質膜は、フッ素樹脂の延伸多孔質膜、特にＰＴＦＥ延伸多孔質膜、であってもよい。ＰＴＦＥ延伸多孔質膜は、通常、ＰＴＦＥ粒子を含むペースト押出物又はキャスト膜を延伸して形成される。ＰＴＦＥ延伸多孔質膜は、ＰＴＦＥの微細なフィブリルにより構成され、フィブリルに比べてＰＴＦＥが凝集した状態にあるノードを有することもある。ＰＴＦＥ延伸多孔質膜によれば、異物の侵入を防ぐ性能及び通気性を高いレベルで両立させることが可能である。保護膜２には、公知の延伸多孔質膜を使用できる。
　厚さ方向の通気性を有する保護膜２は、双方の主面を接続する複数の貫通孔が形成された穿孔膜を含んでいてもよい。穿孔膜は、非多孔質の基質構造を有する原膜、例えば無孔膜、に複数の貫通孔が設けられた膜であってもよい。穿孔膜は、上記複数の貫通孔以外に、厚さ方向の通気経路を有していなくてもよい。貫通孔は、穿孔膜の厚さ方向に延びていてもよく、厚さ方向に直線状に延びるストレート孔であってもよい。貫通孔の開口の形状は、穿孔膜の主面に垂直に見て、円又は楕円であってもよい。穿孔膜は、例えば、原膜に対するレーザー加工、又は、イオンビーム照射及びこれに続く化学エッチングによる孔開け加工により形成できる。
　厚さ方向の通気性を有する保護膜２は、不織布、織布、メッシュ、ネットを含んでいてもよい。
　保護膜２は、単層構造を有していても、２以上の異なる層からなる多層構造を有していてもよい。多層構造を有する保護膜２の例は、ＰＴＦＥ延伸多孔質膜と不織布との積層構造を有する。
　保護膜２は、上記例に限定されない。
　カバー部材１Ａの保護膜２の形状は、保護膜２の主面に垂直に見て、長方形である。ただし、保護膜２の形状は上記例に限定されず、例えば、保護膜２の主面に垂直に見て、正方形及び長方形を含む多角形、円、並びに楕円であってもよい。多角形の角は、丸められていてもよい。
　保護膜２の厚さは、例えば、１～１００μｍである。
　保護膜２の凝集力は、２．０Ｎ／２０ｍｍ以下であってもよい。厚さ方向の高い通気性を有する保護膜２の凝集力は低い傾向にある。このため、厚さ方向の高い通気性を有する保護膜２を備える従来のカバー部材は、剥離時に保護膜２を破損しやすい。一方、カバー部材１では、厚さ方向の高い通気性を有する保護膜２を備える場合においても、保護膜２の破損を抑制できる。言い換えると、厚さ方向の高い通気性を有する保護膜２をカバー部材１が備える場合に、本発明は特に有利である。保護膜２の凝集力は、１．８Ｎ／２０ｍｍ以下、更には１．５Ｎ／２０ｍｍ以下であってもよい。厚さ方向の高い通気性を有する保護膜２は、例えば、ガーレー通気度により表示して、１００秒／１００ｍＬ以下の通気度を有する。
　保護膜２の凝集力は、ＪＩＳ　Ｚ０２３７：２００９に定められた１８０°引きはがし粘着力の測定方法を参考にして、以下に示す方法により測定できる。
　＜試験片の準備＞
　最初に、測定対象である保護膜２を長方形（長さ１００ｍｍ×幅２０ｍｍ）に切り出す。次に、保護膜２と同一の形状を有する両面粘着テープ（日東電工製、Ｎｏ．５６１０）を２枚準備する。各両面粘着テープは、それぞれ、保護膜２の一方の面及び他方の面に外周を一致させて貼り合わせる。次に、長さ１５０ｍｍ×幅２０ｍｍの長方形のＰＥＴフィルム（厚さ２５μｍ）を２枚準備する。各ＰＥＴフィルムは、それぞれ、保護膜２の一方の面及び他方の面に上記両面粘着テープにより貼り合わせる。ＰＥＴフィルムの貼り合わせは、各ＰＥＴフィルムの幅方向の両端部が保護膜２の幅方向の両端部と一致し、かつ各ＰＥＴフィルムの長手方向の両端部が、ＰＥＴフィルムの主面に垂直に見て、保護膜２及び両面粘着テープと重複しないように実施する。ただし、各ＰＥＴフィルムの自由端部の長さ（長手方向）として、引張試験機のチャックがＰＥＴフィルムを安定してつかめる長さ（例えば２５ｍｍ）を確保する。次に、ＰＥＴフィルム／両面粘着テープ／保護膜２／両面粘着テープ／ＰＥＴフィルムの積層体の厚さ方向に圧着力が加わるように、荷重１９．６Ｎの圧着ローラを１往復させる。その後、引張試験を開始するまでに少なくとも３０分放置して、試験片とする。
　＜引張試験による保護膜２の凝集力の測定＞
　次に、引張試験機（例えば、島津製作所製、卓上型精密万能試験機オートグラフＡＧＳ－Ｘ）を準備する。試験片の長手方向の一方の端部における一方のＰＥＴフィルムの自由端部を引張試験機の上部チャックに固定する。試験片の長手方向の他方の端部における他方のＰＥＴフィルムの自由端部を下部チャックに取り付ける。次に、測定温度２５±５℃、測定湿度６０±５％ＲＨ及び引張速度３００ｍｍ／分の条件で、他方のＰＥＴフィルムの下端部を下向きに引っ張る引張試験を実施して、保護膜２に凝集破壊を発生させる。保護膜２の凝集破壊によるＰＥＴフィルムの変位が始まった後、初期の２５ｍｍの変位の際に測定されたチャック間の応力は無視し、その後の５０ｍｍの変位の際に連続的に記録された応力の測定値の平均値を、保護膜２の凝集力（単位：Ｎ／２５ｍｍ）とする。
　保護膜２の面積は、例えば、１７５ｍｍ2以下である。保護膜２の面積が当該範囲にあるカバー部材１は、例えば、小径の開口を有する対象物への配置に適している。保護膜２の面積の下限は、例えば、０．２０ｍｍ2以上である。ただし、保護膜２の面積は、カバー部材１が配置される対象物の種類によっては、より大きな値であってもよい。
　カバー部材１の面積は、例えば、１７５ｍｍ2以下である。面積が当該範囲にあるカバー部材１は、例えば、小径の開口を有する対象物への配置に適している。カバー部材１の面積の下限は、例えば、０．２０ｍｍ2以上である。ただし、カバー部材１の面積は、配置される対象物の種類によっては、より大きな値であってもよい。なお、カバー部材１の面積が小さいほど、部材供給用のシートからの剥離は困難である。このため、カバー部材１の面積が上記範囲にある場合に、本発明の効果は特に顕著となる。
　カバー部材１は、本発明の効果が得られる限り、上述した以外の任意の層及び／又は部材を備えていてもよい。
　本発明のカバー部材の上記とは別の一例を図６Ａ及び図６Ｂに示す。図６Ｂは、図６Ａのカバー部材１（１Ｂ）を第２基材層４の側から見た平面図である。図６Ａには、図６Ｂの断面Ａ－Ａが示されている。図６Ａ及び図６Ｂには、対象物５１の面５３に配置された状態にあるカバー部材１Ｂが示されている。カバー部材１Ｂは、１又は２以上の基材フィルム１８を備える第２基材層４を更に備える以外は、カバー部材１Ａと同様の構成を有する。
　第２基材層４は、保護膜２の他方の主面に接合されて、第１基材層３と共に保護膜２を挟持している。この形態では、剥離時における保護膜２の破損をより確実に抑制できる。また、後述のタブフィルム５をカバー部材１が備える場合に、タブフィルム５の剥離時における保護膜２の破損を抑制できる。
　第２基材層４は、基材フィルム１８として、非発泡体により構成される非発泡フィルム１８Ａのみを備えていてもよい。基材フィルム１８及び非発泡フィルム１８Ａの構成は、それぞれ、基材フィルム１１及び非発泡フィルム１１Ａの構成と同様でありうる。
　第１基材層３及び第２基材層４の各々において保護膜２に最も近い位置にある基材フィルム１１，１８の構成は、同一であってもよい。この形態では、上記保護膜２の破損をより確実に抑制できる。
　第２基材層４は、２以上の基材フィルム１８を備えていてもよい。２以上の基材フィルム１８は、第２基材層４に垂直に見て、同じ形状を有していてもよい。また、２以上の各基材フィルム１８の外周は、第２基材層４において互いに一致していてもよい。２以上の基材フィルム１８は、通常、互いに接合されている。基材フィルム１８の接合法は、基材フィルム１１の接合法と同じであってもよい。
　基材と、当該基材の片面又は両面に粘着剤が塗布されてなる片面粘着テープ又は両面粘着テープを、基材フィルム１８及び粘着剤層として使用してもよい。両面粘着テープを使用した例を図７に示す。
　図７の第２基材層４は、２つの非発泡フィルム１８Ａ，１８Ｂを基材フィルム１８として備える。非発泡フィルム１８Ａは、両面粘着テープ２０の基材である。非発泡フィルム１８Ａと非発泡フィルム１８Ｂとは、両面粘着テープ２０の粘着剤層１９Ａによって接合されている。また、保護膜２と第２基材層４とは、両面粘着テープ２０の粘着剤層１９Ｂによって接合されている。図７のカバー部材１Ｂは、これらの点以外は、図６Ａ及び図６Ｂのカバー部材１Ｂと同様の構成を有する。
　保護膜２と第２基材層４とは、粘着剤又は接着剤によって接合されていてもよいし、上記各種の溶着法によって接合されていてもよい。保護膜２と第２基材層４とは粘着剤層によって接合されていてもよい。粘着剤及び粘着剤層の例は、上述のとおりである。また、保護膜２と第２基材層４とを接合する粘着剤層は、基材フィルム１８を基材とする片面粘着テープ又は両面粘着テープの粘着剤層（例えば、図７の粘着剤層１９Ｂ）であってもよい。
　カバー部材１Ｂの第２基材層４は、保護膜２の主面に垂直に見て、保護膜２の外周に一致する外周を有している。また、カバー部材１Ｂの第２基材層４は、保護膜２の主面に垂直に見て、保護膜２の周縁部に対応する形状（額縁状）を有している。保護膜２の第２基材層４側の面は、第２基材層４が接していない領域において露出している。保護膜２が厚さ方向の通気性を有する場合には、当該領域をカバー部材１の通気領域とすることができる。ただし、第２基材層４の形状は、上記例に限定されない。
　第２基材層４の厚さは、例えば、１０～７００μｍであり、３０～３００μｍであってもよい。
　本発明のカバー部材の上記とは別の一例を図８Ａ及び図８Ｂに示す。図８Ｂは、図８Ａのカバー部材１（１Ｃ）をタブフィルム５の側から見た平面図である。図８Ａには、図８Ｂの断面Ａ－Ａが示されている。図８Ａ及び図８Ｂには、対象物５１の面５３に配置された状態にあるカバー部材１Ｃが示されている。カバー部材１Ｃは、タブフィルム５を更に備える以外は、カバー部材１Ｂと同様の構成を有する。
　タブフィルム５は、カバー部材１の最外層の上に配置されている。最外層は、カバー部材１が面５３に配置されたときに、面５３から最も離れた位置にある。図８Ａ及び図８Ｂの例の最外層は、第２基材層４が備える基材フィルム１８（１８Ｂ）である。タブフィルム５は、最外層の主面に垂直に見て、最外層の外周よりも外方に突出したタブ２１を有する。図８Ａ及び図８Ｂのタブ２１の形状は、タブフィルム５の主面に垂直に見て、長方形である。タブ２１の形状は、この例に限定されない。なお、本明細書において外方とは、保護膜２の主面に垂直に見て、カバー部材１の中心から離れる方向を意味する。
　タブフィルム５は、通常、カバー部材１の使用時に除去される。タブフィルム５は、例えば、カバー部材１を部材供給用のシートから剥離して対象物５１の面５３に配置した後に除去される。タブ２１を把持することで、シートからの剥離及び／又はタブフィルム５の除去を実施してもよい。
　タブフィルム５と最外層との剥離力は、部材供給用のシートとカバー部材１との剥離力に比べて大きくてもよい。なお、剥離力とは、互いに接合した状態にある２つの層及び／又は部材から一方の層又は部材を剥離するのに要する力を意味する。
　部材供給用のシートからのカバー部材１の剥離は、例えば、カバー部材１におけるシートから最も離れた位置にある層を吸着や把持により持ち上げて実施できる。当該層は、例えば、保護膜２又はタブフィルム５である。ただし、カバー部材１の剥離の態様は、上記例に限定されない。
　カバー部材１が配置される対象物５１は、例えば、電子機器の筐体である。カバー部材１は、電子機器の筐体の外面及び／又は内面に配置できる。このとき、開口は、電子機器の筐体に設けられた通気口及び／又は通音口であってもよい。電子機器の例は、スマートウォッチ及びリストバンド等のウェアラブルデバイス；アクションカメラ及び防犯カメラを含む各種のカメラ；携帯電話、スマートフォン及びタブレット等の情報通信機器；仮想現実（ＶＲ）機器；拡張現実（ＡＲ）機器；並びにセンサー機器である。ただし、電子機器は、この例に限定されない。
　カバー部材１の配置により通過が防がれる異物は、例えば、塵埃等の粒子、水滴等の液体の水である。
　カバー部材１を使用する態様の例を図９及び図１０に示す。
　図９の例では、対象物である電子機器の筐体５１の内面５４にカバー部材１が配置されている。筐体５１には開口５２が設けられており、カバー部材１は、開口５２を保護膜２が覆うように、内面５４に配置されている。第１基材層３は、カバー部材１が内面５４に配置された状態で、保護膜２と内面５４との間に位置する。第２基材層４は、筐体５１の内部の空間に面している。第１基材層３は、内面５４に垂直に見て、開口５２を囲んでいる。保護膜２により、開口５２を介した異物の通過が防がれる。カバー部材１は、開口５２を介した音の透過を確保しながら異物の通過を防ぐ部材として機能しうる。また、保護膜２が厚さ方向の通気性を有する場合には、保護膜２を介した通気が確保される。このとき、カバー部材１は、開口５２を介した通気を確保しながら異物の通過を防ぐ部材として機能しうる。
　図１０の例では、第２基材層４が半導体素子５５に接している。この点以外は、図９の例と同様である。半導体素子５５は、筐体５１の内部に配置されている。半導体素子５５には、通気及び／又は通音用の開口が設けられていてもよい。このとき、当該開口を有する半導体素子５５の面に垂直に見て、当該開口を第２基材層４が囲んでいてもよい。半導体素子５５の例は、気圧、湿度、ガス、エアフロー又は加速度等を検出する各種のセンサー素子、並びにスピーカー及びマイクロフォン等の音響変換素子である。カバー部材１は、開口５２及び半導体素子５５の開口を介した通気及び／又は音の透過を確保しながら筐体５１の外部から半導体素子５５への異物の通過を防ぐ部材として機能しうる。
　カバー部材１を使用する態様は、上記例に限定されない。
　カバー部材１は、例えば、保護膜２、基材フィルム１１，１８及びタブフィルム５の形状加工及び積層により形成できる。
　［部材供給アセンブリ］
　カバー部材１は、部材供給用のシートにより供給可能である。当該シートによるカバー部材１の供給態様である部材供給アセンブリの一例を図１１に示す。図１１の部材供給アセンブリ４１は、部材供給用のシート３１と、シート３１上に配置された１又は２以上のカバー部材１とを備える。各カバー部材１では、第１基材層３がシート３１に面している。部材供給アセンブリ４１によれば、例えば、対象物の面に配置する工程に対してカバー部材１を効率的に供給できる。
　シート３１上へのカバー部材１の配置の例を図１２及び図１３に示す。図１２の例では、図１Ａのカバー部材１Ａがシート３１上に配置されている。図１３の例では、図８Ａのカバー部材１Ｃがシート３１上に配置されている。シート３１へのカバー部材１の配置には、粘着剤層１６（図５参照）が利用できる。また、カバー部材１は、シート３１におけるカバー部材１の配置面に設けられた粘着剤層を介して、シート３１上に配置されていてもよい。配置面の粘着剤層は、弱粘着性であることが好ましい。
　シート３１を構成する材料の例は、紙、金属、樹脂及びこれらの複合材料である。金属は、例えば、ステンレス及びアルミニウムである。樹脂は、例えば、ＰＥＴ等のポリエステル、ＰＥ及びＰＰ等のポリオレフィンである。ただし、シート３１を構成する材料は、上記例に限定されない。
　シート３１の厚さは、例えば、１～２５０μｍである。
　図１１の部材供給アセンブリ４１は、シート３１の主面に垂直に見て、長方形のシート３１を備えている。ただし、シート３１の形状は、この例に限定されない。シート３１の形状は、シート３１の主面に垂直に見て、長方形以外の多角形（例えば正方形）、円、楕円又は帯状であってもよい。多角形の角は、丸められていてもよい。
　図１１の部材供給アセンブリ４１では、複数のカバー部材１は、シート３１上に規則的に整列して配置されている。より具体的には、複数のカバー部材１は、配置面上の仮想の格子の交点に配置されている。ただし、部材供給アセンブリ４１におけるカバー部材１の配置の形態は、上記例に限定されない。
　図１１の部材供給アセンブリ４１は、当該アセンブリ４１の主面に垂直に見て、長方形である。ただし、部材供給アセンブリ４１の形状は、上記例に限定されない。部材供給アセンブリ４１の形状は、当該アセンブリ４１の主面に垂直に見て、長方形以外の多角形（例えば正方形）、円、楕円又は帯状であってもよい。多角形の角は、丸められていてもよい。部材供給アセンブリ４１の形状は、シート３１の形状と同じであってもよい。帯状の部材供給アセンブリ４１は、通常、帯状のシート３１を備える。帯状の部材供給アセンブリ４１は、巻回体としてもよい（巻回されて巻回体を構成してもよい）。帯状の部材供給アセンブリ４１は、巻芯に巻回されて巻回体を構成してもよい。
　部材供給アセンブリ４１は、シート３１上にカバー部材１を配置して製造できる。
　以下、実施例により、本発明を更に詳細に説明する。ただし、本発明は、実施例に示す態様に限定されない。
　最初に、カバー部材の評価方法を示す。
　［部材供給用のシートからのカバー部材の剥離性］
　実施例及び比較例の各カバー部材について、部材供給用のシートからの剥離性を以下のように評価した。作製したカバー部材を温度２３℃、湿度６５％ＲＨの雰囲気に２４時間放置して、カバー部材を構成する各層の間の接合及びカバー部材と部材供給用のシートとの間の接合を安定させた。次に、カバー部材の側面（実施例１，２及び比較例１～３）又はタブフィルムのタブ（実施例３～７、比較例４，５）をピンセットで把持して持ち上げることにより、部材供給用のシートからカバー部材を剥離した。亀裂等の破損が保護膜に生じず、かつ部材供給用のシートを折り曲げることなくカバー部材を剥離できた場合を優（◎）、亀裂等の破損は保護膜に生じなかったが、カバー部材の剥離には部材供給用のシートの折り曲げ（カバー部材の配置面を外面とする折り曲げ）が必要であった場合を劣（△）、部材供給用のシートを折り曲げたにもかかわらず、剥離時に亀裂等の破損が保護膜に生じた場合を不可（×）とした。
　［タブフィルムの剥離時における保護膜の破損の有無］
　第１基材層、第２基材層及びタブフィルムを備える実施例３～７及び比較例４，５の各カバー部材について、以下のように、タブフィルムの剥離時における保護膜の破損の有無を評価した。作製したカバー部材を温度２３℃、湿度６５％ＲＨの雰囲気に２４時間放置して、カバー部材を構成する各層の間の接合及びカバー部材と部材供給用のシートとの間の接合を安定させた。次に、タブフィルムのタブをピンセットで把持して持ち上げることにより、部材供給用のシートからカバー部材を剥離した。次に、剥離したカバー部材を、第１基材層を介してポリカーボネート板の表面に貼り付けた。次に、ピンセットでタブを把持して、タブフィルムを第２基材層から剥離した。このとき、保護膜に亀裂等の破損が生じた場合を破損有り（×）、生じなかった場合を破損無し（〇）とした。
　［第１基材層と部材供給用のシートとの剥離力］
　第１基材層と部材供給用のシートとの剥離力は、実施例及び比較例の各カバー部材の作製とは別に、ＪＩＳ　Ｚ０２３７：２００９に定められた１８０°引きはがし粘着力の測定方法に準拠して、以下のように評価した。
　最初に、各カバー部材に使用した部材供給用のシートと、各カバー部材において当該シートに接する両面粘着テープとを準備した。次に、シートと両面粘着テープとを温度２３℃、湿度６５％ＲＨの雰囲気下にて貼り合わせ、当該雰囲気に２４時間放置して、両者の間の接合を安定させた。貼り合わせる際には、質量２ｋｇの圧着ローラを一往復させた。次に、シート及び両面粘着テープの積層体を長方形（長さ１２０ｍｍ×幅３０ｍｍ）に切り出して試験片を得た。次に、測定温度２３℃、測定湿度６５％ＲＨ及び引張速度３００ｍｍ／分の測定条件にて、両面粘着テープをシートから引き剥がす１８０°引きはがし試験を実施して、１８０°引きはがし粘着力（単位：Ｎ／３０ｍｍ）を測定した。引張試験機には、卓上型精密万能試験機オートグラフＡＧＳ－Ｘ（島津製作所製）を用いた。得られた１８０°引きはがし粘着力を、第１基材層とシートとの剥離力とした。
　［第１基材層を備えるカバー部材］
　（実施例１）
　＜保護膜の準備＞
　ＰＴＦＥファインパウダー（ダイキン工業製、ポリフロンＰＴＦＥ　Ｆ－１０４）１００重量部と、成形助剤としてｎ－ドデカン（ジャパンエナジー製）２０重量部とを均一に混合した。得られた混合物をシリンダーを用いて圧縮した後、ラム押出成形して、シート状の混合物を形成した。次に、シート状の混合物を一対の金属ロールを通して厚さ０．２ｍｍに圧延し、更に１５０℃の加熱により成形助剤を除去して、ＰＴＦＥシート成形体を形成した。次に、形成したシート成形体を、延伸温度２６０℃、延伸倍率１．５倍で長手方向に延伸した。次に、延伸温度１５０℃、延伸倍率６．５倍で幅方向に延伸し、更に３６０℃で１０分焼成して、ＰＴＦＥ延伸多孔質膜である保護膜Ａを得た。保護膜Ａの凝集力は、２．０Ｎ／２０ｍｍであった。保護膜Ａの凝集力は、上述の方法により評価した。
　次に、保護膜Ａの一方の主面に不織布（厚さ２７０μｍ、目付７０ｇ／ｍ2）を接合して、保護膜Ｂを得た。この不織布は、ＰＥＴをコアとし、ポリエチレンを鞘とする芯鞘構造を有する複合繊維からなっていた。保護膜Ａ及び不織布は、熱ラミネート（温度２００℃、圧力０．２ＭＰａ）により接合した。
　＜第１基材層の準備＞
　両面粘着テープＡ（日東電工製、Ｎｏ．５７１２０Ｂ、厚さ１００μｍ）、ＰＥＴフィルムＡ（東レ製、ルミラー＃２５Ｓ１０、厚さ２５μｍ、非発泡）及び両面粘着テープＢ（日東電工製、Ｎｏ．５６０３、厚さ３０μｍ）の積層体（この順に各層が配置）を準備した。両面粘着テープＡの基材は、ＰＥの発泡フィルム（厚さ６０μｍ）であった。両面粘着テープＢの基材は、ＰＥＴの非発泡フィルム（厚さ１２．５μｍ）であった。次に、外形１１ｍｍ×１０ｍｍ、内形６．８ｍｍ×３．８ｍｍの額縁状に積層体を打ち抜き加工して、第１基材層Ａを得た。第１基材層Ａは、基材フィルムとして、２層の非発泡フィルムと１層の発泡フィルムとを備えていた。両面粘着テープＡ，Ｂの粘着剤は、アクリル系であった。
　＜部材供給用のシートの準備＞
　部材供給用のシートとして、ＰＥＴシート（ニッパ製、ＰＥＴ７５ｘ１－ＪＯＬ、厚さ７５μｍ）を準備した。シートは、長さ１６０ｍｍ及び幅６０ｍｍの長方形とした。
　＜カバー部材の作製＞
　保護膜Ｂと第１基材層Ａとを、第１基材層Ａの両面粘着テープＢにより接合した。接合は、両面粘着テープＢとＰＴＦＥ延伸多孔質膜とが接するように実施した。次に、全体を外径９ｍｍ×６ｍｍの長方形に打ち抜き加工して、実施例１のカバー部材を得た。打ち抜き加工は、額縁状である第１基材層Ａの内形の中心が当該加工後の全体の中心と一致するように実施した。次に、カバー部材を部材供給用のシートに両面粘着テープＡを介して配置した。この状態で、第１基材層Ａが備える基材フィルムのうち、両面粘着テープＡの基材である発泡フィルムが、保護膜Ｂから最も離れ、かつ部材供給用のシートに最も近い位置にあった。
　（実施例２）
　保護膜Ａに接合する不織布として、ＰＥＴをコアとし、低融点共重合ポリエステルを鞘とする芯鞘構造を有する複合繊維からなる不織布（厚さ１０５μｍ、目付３０ｇ／ｍ2）を使用した以外は実施例１と同様にして、カバー部材を得た。実施例２のカバー部材が備える保護膜を保護膜Ｃとする。カバー部材は、第１基材層Ａの両面粘着テープＡを介して、部材供給用のシートに配置した。
　（比較例１）
　第１基材層Ａの代わりに第１基材層Ｂを使用した以外は実施例１と同様にして、カバー部材を得た。第１基材層Ｂには、両面粘着テープＣ（日東電工製、Ｎｏ．５６１０、厚さ１００μｍ）を使用した。両面粘着テープＣの基材は、ＰＥＴの非発泡フィルム（厚さ５０μｍ）であった。第１基材層Ｂは、基材フィルムとして、１層の非発泡フィルムを備えていた。両面粘着テープＣの粘着剤は、アクリル系であった。カバー部材は、第１基材層Ｂの両面粘着テープＣを介して、部材供給用のシートに配置した。
　（比較例２）
　第１基材層Ａの代わりに第１基材層Ｃを使用した以外は実施例２と同様にして、カバー部材を得た。第１基材層Ｃには、両面粘着テープＡを使用した。第１基材層Ｃは、基材フィルムとして、１層の発泡フィルムを備えていた。カバー部材は、第１基材層Ｃの両面粘着テープＡを介して、部材供給用のシートに配置した。
　（比較例３）
　第１基材層Ａの代わりに第１基材層Ｂを使用した以外は実施例２と同様にして、カバー部材を得た。比較例３のカバー部材は、第１基材層Ｂの両面粘着テープＣを介して、部材供給用のシートに配置した。
　第１基材層の構成を表１に示す。実施例１，２及び比較例１～３の構成及び評価結果を表２に示す。表１の「発泡」及び「非発泡」は、それぞれ、両面粘着テープの基材が発泡フィルム及び非発泡フィルムであることを示す。
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
　表１に示すように、非発泡フィルム及び発泡フィルムを第１基材層が備える実施例のカバー部材は、比較例のカバー部材に比べて剥離性に優れていた。
　［第１基材層、第２基材層及びタブフィルムを備えるカバー部材］
　（実施例３）
　＜第２基材層の準備＞
　両面粘着テープＣ及びＰＥＴフィルムＢ（東レ製、ルミラー＃５０Ｓ１０、厚さ５０μｍ、非発泡）の積層体を準備した。次に、積層体を、外形１１ｍｍ×１０ｍｍ、内形６．８ｍｍ×３．８ｍｍの額縁状に打ち抜き加工して、第２基材層Ａを得た。
　＜カバー部材の作製＞
　保護膜Ａの一方の面に対して第１基材層Ａを、第１基材層Ａの両面粘着テープＢにより接合した。次に、保護膜Ａの他方の面に対して第２基材層Ａを、第２基材層Ａの両面粘着テープＣにより接合した。第２基材層Ａの接合は、保護膜Ａの主面に垂直に見て、額縁状である第１基材層Ａ及び第２基材層の各々の内形が一致するように実施した。次に、全体を外径９ｍｍ×６ｍｍの長方形に打ち抜き加工して、カバー部材を得た。打ち抜き加工は、第１基材層Ａ及び第２基材層Ａの内形の中心が当該加工後の全体の中心となるように実施した。次に、カバー部材を部材供給用のシートに第１基材層Ａの両面粘着テープＡを介して配置した。この状態で、第１基材層Ａが備える基材フィルムのうち、両面粘着テープＡの基材である発泡フィルムが、保護膜Ａから最も離れ、かつ部材供給用のシートに最も近い位置にあった。
　（実施例４）
　第２基材層Ａの代わりに第２基材層Ｂを使用した以外は実施例３と同様にして、カバー部材を得た。第２基材層Ｂには、両面粘着テープＢ及びＰＥＴフィルムＢの積層体を使用した。第２基材層Ｂは、第２基材層Ｂの両面粘着テープＢにより保護膜Ａに接合した。カバー部材は、第１基材層Ａの両面粘着テープＡを介して、部材供給用のシートに配置した。この状態で、第１基材層Ａが備える基材フィルムのうち、両面粘着テープＡの基材である発泡フィルムが、保護膜Ａから最も離れ、かつ部材供給用のシートに最も近い位置にあった。
　（実施例５）
　第１基材層Ａの代わりに第１基材層Ｄを使用した以外は実施例４と同様にして、カバー部材を得た。第１基材層Ｄには、両面粘着テープＤ（日東電工製、Ｎｏ．５７１１５Ｂ、厚さ１５０μｍ）、ＰＥＴフィルムＡ及び両面粘着テープＢの積層体（この順に各層が配置）を準備した。両面粘着テープＤの基材は、ポリエチレンの発泡フィルム（厚さ８０μｍ）であった。第１基材層Ｄは、基材フィルムとして、２層の非発泡フィルムと１層の発泡フィルムとを備えていた。両面粘着テープＤの粘着剤は、アクリル系であった。第１基材層Ｄは、第１基材層Ｄの両面粘着テープＢにより保護膜Ａに接合した。カバー部材は、第１基材層Ｄの両面粘着テープＤを介して、部材供給用のシートに配置した。この状態で、第１基材層Ｄが備える基材フィルムのうち、両面粘着テープＤの基材である発泡フィルムが、保護膜Ａから最も離れ、かつ部材供給用のシートに最も近い位置にあった。
　（実施例６）
　第１基材層Ａの代わりに第１基材層Ｅを使用した以外は実施例４と同様にして、カバー部材を得た。第１基材層Ｅには、両面粘着テープＥ（日東電工製、Ｎｏ．５７１２０Ｂ、厚さ２００μｍ）、ＰＥＴフィルムＡ及び両面粘着テープＢの積層体（この順に各層が配置）を準備した。両面粘着テープＥの基材は、ポリエチレンの発泡フィルム（厚さ１００μｍ）であった。第１基材層Ｅは、基材フィルムとして、２層の非発泡フィルムと１層の発泡フィルムとを備えていた。両面粘着テープＥの粘着剤は、アクリル系であった。第１基材層Ｅは、第１基材層Ｅの両面粘着テープＢにより保護膜Ａに接合した。カバー部材は、第１基材層Ｅの両面粘着テープＥを介して、部材供給用のシートに配置した。この状態で、第１基材層Ｅが備える基材フィルムのうち、両面粘着テープＥの基材である発泡フィルムが、保護膜Ａから最も離れ、かつ部材供給用のシートに最も近い位置にあった。
　（実施例７）
　第１基材層Ａの代わりに第１基材層Ｆを使用した以外は実施例４と同様にして、カバー部材を得た。第１基材層Ｆには、両面粘着テープＡ及び両面粘着テープＢの積層体を準備した。第１基材層Ｆは、基材フィルムとして、１層の非発泡フィルムと１層の発泡フィルムとを備えていた。第１基材層Ｆは、第１基材層Ｆの両面粘着テープＢにより保護膜Ａに接合した。カバー部材は、第１基材層Ｆの両面粘着テープＡを介して、部材供給用のシートに配置した。この状態で、第１基材層Ｆが備える基材フィルムのうち、両面粘着テープＡの基材である発泡フィルムが、保護膜Ａから最も離れ、かつ部材供給用のシートに最も近い位置にあった。
　（比較例４）
　第１基材層Ａの代わりに第１基材層Ｂを使用した以外は実施例３と同様にして、カバー部材を得た。カバー部材は、第１基材層Ｂの両面粘着テープＣを介して、部材供給用のシートに配置した。
　（比較例５）
　第１基材層Ａの代わりに第１基材層Ｃを使用した以外は実施例３と同様にして、カバー部材を得た。カバー部材は、第１基材層Ｂの両面粘着テープＡを介して、部材供給用のシートに配置した。
　第１基材層及び第２基材層の構成を、それぞれ、表３，４に示す。実施例３～７及び比較例４，５の構成及び評価結果を表５に示す。表３の「発泡」及び「非発泡」は、それぞれ、両面粘着テープの基材が発泡フィルム及び非発泡フィルムであることを示す。
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
　表５に示すように、非発泡フィルム及び発泡フィルムを第１基材層が備える実施例のカバー部材は、比較例のカバー部材に比べて剥離性に優れていた。また、発泡フィルムのみを第１基材層が備える比較例５のカバー部材では、タブフィルムの剥離時に保護膜の破損が生じた。これは、第１基材層が過度に柔軟であることでタブフィルムを剥離する際の保護膜の変形が大きくなり、凝集破壊したためと推定される。なお、比較例４のカバー部材は、部材供給用のフィルムから剥離する際に保護膜が破損したため、タブフィルムの剥離時における保護膜の破損の有無は評価不能であった。
　本発明のカバー部材は、保護膜を備える従来のカバー部材と同様の用途に使用できる。

Claims (14)

  1. 　開口を有する面を持つ対象物の当該面に配置されて、前記開口における異物の通過を防ぐカバー部材であって、
    　前記カバー部材が前記面に配置されたときに前記開口を覆う形状を有する保護膜と、
    　前記保護膜の一方の主面に接合された第１基材層と、を備え、
    　前記第１基材層は、２以上の基材フィルムを含む積層構造を有すると共に、前記カバー部材が前記面に配置されたときに前記保護膜と前記面との間に位置し、
    　前記２以上の基材フィルムは、非発泡フィルムと発泡フィルムとを備える、カバー部材。
  2. 　前記発泡フィルムは、前記非発泡フィルムよりも前記保護膜から離れた位置にある、請求項１に記載のカバー部材。
  3. 　前記第１基材層において、前記保護膜から最も離れた位置にある前記基材フィルムが前記発泡フィルムである、請求項１又は２に記載のカバー部材。
  4. 　前記保護膜は、厚さ方向の通気性を有する、請求項１～３のいずれかに記載のカバー部材。
  5. 　前記保護膜は、ポリテトラフルオロエチレン延伸多孔質膜を含む、請求項１～３のいずれかに記載のカバー部材。
  6. 　前記保護膜の凝集力が２．０Ｎ／２０ｍｍ以下である、請求項１～５のいずれかに記載のカバー部材。
  7. 　前記第１基材層は、前記保護膜の主面に垂直に見て、前記保護膜の外周に一致する外周を有する、請求項１～６のいずれかに記載のカバー部材。
  8. 　前記カバー部材は、１又は２以上の前記基材フィルムを備える第２基材層を更に備え、
    　前記第２基材層は、前記保護膜の他方の主面に接合されて、前記第１基材層と共に前記保護膜を挟持している、請求項１～７のいずれかに記載のカバー部材。
  9. 　前記第２基材層は、前記基材フィルムとして非発泡フィルムのみを備える、請求項８に記載のカバー部材。
  10. 　前記第１基材層及び前記第２基材層の各々において前記保護膜に最も近い位置にある前記基材フィルムの構成が同一である、請求項８又は９に記載のカバー部材。
  11. 　前記第２基材層は、前記保護膜の主面に垂直に見て、前記保護膜の外周に一致する外周を有する、請求項８～１０のいずれかに記載のカバー部材。
  12. 　前記カバー部材は、前記カバー部材が前記面に配置されたときに前記面から最も離れた位置にある前記カバー部材の最外層の上に配置されたタブフィルムを更に備え、
    　前記タブフィルムは、前記最外層の主面に垂直に見て、前記最外層の外周よりも外方に突出した部分を有する請求項１～１１のいずれかに記載のカバー部材。
  13. 　部材供給用のシートと、前記シート上に配置されたカバー部材と、を備え、
    　前記カバー部材は、請求項１～１２のいずれかに記載のカバー部材であり、
    　前記カバー部材の前記第１基材層が前記シートに面している、部材供給アセンブリ。
  14. 　前記部材供給アセンブリは帯状であり、巻回されて巻回体を構成している請求項１３に記載の部材供給アセンブリ。
PCT/JP2020/030270 2019-08-16 2020-08-06 カバー部材及びこれを備える部材供給アセンブリ WO2021033571A1 (ja)

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