JP6522039B2 - Protective film-attached film piece, method of removing protective film of protective film-attached film piece, and method of manufacturing electric device - Google Patents

Description

  The present invention relates to a protective film-attached film piece, a protective film-removing method for the protective film-attached film piece, and a method for producing an electrical device.

  Speakers, microphones, receivers, etc. equipped with an electroacoustic transducer such as a portable radio, a small radio, a transceiver, a portable music player, a laptop computer, a headphone, an earphone, an outdoor microphone, a digital camera, etc. A sound passing hole is provided to pass the inside of the case to the outside and the outside to the inside. A venting membrane (waterproof filter) is attached to the sound-passing hole as a membrane piece for the purpose of preventing the entry of water into the electronic device. Further, for example, a ventilation film or the like is attached to the optical sensor as a film piece mainly for the purpose of eliminating dust and reducing the pressure difference between inside and outside.

  The film piece provided for the production of the electronic device is provided with a protective film from the viewpoint of contamination prevention, transport and ease of operation. Further, the protective film is provided with a tab so that the protective film can be easily peeled off. For example, there is a method of using a portion obtained by extending an end of a protective film as a tab (Patent Document 1) or a method of attaching a material different from the protective film as a tab (Patent Document 2). Further, without providing the tab, a cut is formed from the outer peripheral portion of the protective film to the position corresponding to the opening of the adhesive layer under the protective film, and the outer peripheral portion of the protective film divided into two across the cut. The method (patent document 3) of picking up one side part of and peeling off this protective film is also proposed.

JP 2004-10854 A JP 2005-15631 A JP, 2011-115687, A

  In the technique of picking up and peeling off a part of the protective film, one problem is that when picking up the protective film, the film piece itself may tear in the vertical direction of the film piece. For example, when a porous polytetrafluoroethylene film (hereinafter referred to as "porous PTFE membrane") is used as the above-mentioned membrane piece, the porous PTFE membrane is stretched in the horizontal direction of the membrane and therefore the vertical direction of the membrane There is a possibility that the film piece itself may be torn in the vertical direction when the protective film is peeled off.

  Moreover, when forming a cut in the protective film, the shape of the cut is easily transferred as a groove to an adhesive layer or the like under the protective film. Depending on the shape of the cut, when it is difficult to ensure the high water resistance required when using a breathable film as the film piece, for example, due to the groove formed in the adhesive layer or the like, the film has. There is. Specifically, for example, when the adhesive layer is a frame-like adhesive layer having an open area, a groove formed by transferring a cut to the adhesive layer can be formed from the outer edge of the adhesive layer to the inner edge of the adhesive layer, ie, the outer edge of the open area. If it penetrates, it may be difficult to secure sufficient water resistance due to this groove.

  The present invention has been made focusing on the above circumstances, and an object thereof is to efficiently carry out film fragments without causing breakage of the film fragments or the like when the film fragments are attached to an adherend such as a housing or the like. The protective film can be peeled off from the protective film-attached film piece, and after mounting, the excellent characteristics that the film piece originally has, for example, the excellent water resistance characteristics that the air permeable film originally has when a breathable film is adopted, It is in establishing a film piece with a protective film that can be exhibited over a long period of time.

  The protective film-attached film piece of the present invention, which has solved the above problems, has a film piece, a protective film in which at least a part of the outer edge is outside the outer edge of the film piece, and between the film piece and the protective film A protective film-attached film piece having an upper adhesive layer positioned on the protective film, wherein the protective film has a cut, and one end of the cut is inward of the outer edge of the film piece, and the other end Is characterized in that it is outward of the outer edge of the membrane piece and inward of the outer edge of the protective film. Hereinafter, the form of the protective film-attached film piece may be referred to as "first embodiment".

  Another protective film-attached film piece of the present invention, which has solved the above problems, comprises a film piece, a protective film in which at least a part of the outer edge is outside the outer edge of the film piece, the film piece and the protective film A protective film-coated film piece having an upper adhesive layer positioned between the two, wherein the protective film has a cut formed thereon, the cut having two cut portions intersecting the outer edge of the film piece And a first straight line connecting a first intersection where the outer edge of the membrane piece and one of the cuts intersect, a first straight line connecting the center of gravity of the membrane piece, and a second straight where the outer edge of the membrane piece intersects the other cut. A feature of the present invention is that the angle between the intersection and the second straight line connecting the center of gravity of the membrane pieces is less than 180 °. Hereinafter, the form of the protective film-attached film piece may be referred to as "second embodiment".

  In a preferred embodiment of the present invention, the shortest distance between at least one of the first intersection and the second intersection and the outer edge of the protective film is 1 mm or more.

  In a preferred embodiment of the present invention, the center of the largest inscribed circle or the largest inscribed ellipse and the center of gravity of the film piece in a region inside the outer edge of the protective film and outside the outer edge of the film piece And a straight line passing through the first intersection point and the second intersection point.

In a preferred embodiment of the present invention, the protective film has a longitudinal direction, and a first region separated by a plane perpendicular to the longitudinal direction and a second region having a smaller area than the first region. And the first section along the outer edge of the membrane piece in the first region and the second section along the outer edge of the membrane piece in the second area are equal in length,
A cut is formed in the protective film, and the cut intersects the first section at at least two cuts.

  In a preferred embodiment of the present invention, the cut is connected in an area inward of the outer edge of the membrane piece.

  In a preferred embodiment of the present invention, the cuts extend through the entire thickness of the protective film.

  In a preferred embodiment of the present invention, the protective film-attached film piece further comprises a lower adhesive layer and a base film on the side of the film piece opposite to the upper adhesive layer.

  In a preferred embodiment of the present invention, the upper adhesive layer has an open area.

  In a preferred embodiment of the present invention, the cut is located more outward than the outer edge of the open area of the upper adhesive layer.

  In a preferred embodiment of the present invention, the upper adhesive layer is formed on the protective film, and the cut extends to the upper adhesive layer.

  In a preferred embodiment of the present invention, the membrane piece is a gas permeable membrane.

  In a preferred embodiment of the present invention, the membrane piece is a porous polytetrafluoroethylene membrane.

  In a preferred embodiment of the present invention, the film piece has a liquid repellent agent added to the surface.

  In a preferred embodiment of the present invention, the protective film is colored in a chromatic color.

  The method for removing a protective film of a protective film-attached film piece according to the present invention, which solves the above problems, grasps a region of the protective film-attached film piece more outward than the outer edge of the film piece in the protective film Is characterized in that it includes the step of peeling off the

  The method for manufacturing an electric device according to the present invention, which has solved the above-mentioned problems, comprises the step of grasping a region of the protective film-attached film piece outside the outer edge of the film piece in the protective film and peeling off the protective film. There is a feature in the place where it is included.

  ADVANTAGE OF THE INVENTION According to this invention, at the time of mounting | wearing to adherends, such as a housing | casing, a film can be peeled from a film with a protective film efficiently, without making a fracture | rupture of a film etc. produce. In addition, after being attached to an adherend such as a housing, it is possible to exhibit excellent characteristics originally possessed by the film piece for a long time.

1-1 is a figure which shows an example of the film-with-protective-film piece of 1st Embodiment of this invention. 1-2 is a figure which shows another example of the film piece with a protective film of 1st Embodiment of this invention. 1-3 is a figure which shows another example of the film piece with a protective film of 1st Embodiment of this invention. FIGS. 2-1 is a figure which shows an example of the film piece with a protective film of 2nd Embodiment of this invention. 2-2 is a figure which shows another example of the film piece with a protective film of 2nd Embodiment of this invention. 2-3 is a figure which shows another example of the film piece with a protective film of 2nd Embodiment of this invention. FIGS. 3-1 is a figure which illustrates the form of the cut | interruption in 2nd Embodiment of this invention. FIGS. 3-2 is a figure which illustrates another form of the cut | interruption in 2nd Embodiment of this invention. FIG. 4 is a view for explaining the shortest distance between at least one of the first intersection and the second intersection and the outer edge of the protective film in the second embodiment of the present invention. FIG. 5 is a top view showing an example of a protective film-attached film piece of Embodiment 2a of the present invention. FIG. 6 is a top view showing an example of a protective film-attached film piece of Embodiment 2b of the present invention. FIG. 7 is a perspective view showing an example of a protective film-attached film piece having two protective films. 8-1 is a cross-sectional view illustrating the form of the upper adhesive layer. 8-2 is a cross-sectional view illustrating another form of the upper adhesive layer. FIG. 9 is a cross-sectional view illustrating various embodiments in which a frame-like adhesive layer is formed as the upper adhesive layer and the lower adhesive layer. FIG. 10 is a cross-sectional view illustrating various embodiments in which a slightly adhesive layer is formed as the upper adhesive layer and a frame-shaped adhesive layer is formed as the lower adhesive layer. FIG. 11 is a cross-sectional view illustrating various embodiments in which a frame-shaped adhesive layer is formed as the upper adhesive layer and a slightly adhesive layer is formed as the lower adhesive layer. FIG. 12 is a cross-sectional view illustrating various embodiments in which a slightly adhesive layer is formed as the upper adhesive layer and the lower adhesive layer. FIG. 13 is a cross-sectional view showing a state in which the protective film-attached film piece of the present invention is attached to a housing.

  Hereinafter, the protective film-attached film piece in the embodiment of the present invention will be described in detail with reference to the drawings.

First Embodiment
1-1 (a) and (b) are views showing an example of a protective film-attached film piece according to the first embodiment of the present invention, and FIG. 1-1 (a) is a cross-sectional view, FIG. ) Is a top view from the protective film 3 side.

  For convenience of explanation, in FIG. 1-1 (b), the display of the upper adhesive layer 4 is omitted to show the film piece 2, and in FIG. 1-1 (a), the cut 5 is not shown. Moreover, although the surface of the protective film 3 is not shown in figure, the release process is performed. Hereinafter, the same applies to FIGS. 2-1 to 6 and 8 to 13. Furthermore, the outer edge 4X of the opening area | region of the upper side adhesive layer 4 is shown only in FIGS. 1-1 (b) and 2-1 (b).

  In FIG. 1-1, the protective film-attached film piece 1 is a film piece 2, and a protective film 3 in which at least a part of the outer edge is outside the outer edge of the film piece 2, the film piece 2 and the protection And an upper adhesive layer 4 positioned between the films 3, and a cut 5 is formed in the protective film 3, and one end 5A of the cut 5 is inward of the outer edge of the film piece 2 And the other end 5 B is more outward than the outer edge of the film piece 2 and more inward than the outer edge of the protective film 3.

  In the above FIGS. 1-1 (a) and (b), the entire periphery of the outer edge of the protective film 3 is on the outer side than the outer edge of the film piece 2, but the present invention is not limited thereto. At least a portion may be outside of the outer edge of the membrane piece. FIGS. 1-2 (a) (b) and FIGS. 1-3 (a) (b) are mentioned as another example of the film piece with a protective film of 1st Embodiment of this invention. 1-2 (a) and 1-3 (a) are cross-sectional views, and FIGS. 1-2 (b) and 1-3 (b) are FIGS. 1-2 (a) and 1-3 (a). ) Is a top view from the protective film 3 side. As shown in FIGS. 1-2 (a) (b) and 1-3 (a) (b), at least a part of the outer edge of the protective film 3 is more outward than the outer edge of the film piece, The other part of the outer edge of the film 3 may be at the same position as the outer edge of the film piece.

  In the present invention, at least a part of the outer edge of the protective film 3 is outward of the outer edge of the film piece, and the other part of the outer edge of the protective film 3 is inward of the outer edge of the film piece. In the top view from the protective film 3 side, the entire surface of the film piece 2 is as shown in FIGS. 1-1 (b), 1-2 (b) and 1-3 (b). It is preferable to be covered by the protective film 3. The same applies to the second embodiment described later, and in the top view from the protective film 3 side as illustrated in FIGS. 2-1 (b), 2-2 (b) and 2-3 (b), It is preferable that the entire surface of the film piece 2 be covered with the protective film 3.

  The first embodiment is characterized in that the protective film 3 is formed with a cut 5 specifying the positions of one end 5A and the other end 5B. The positions where the cuts 5 are formed, that is, the positions of the ends 5A and 5B of the cuts are not limited to FIGS. 1-1 to 1-3, and one end 5A is more inward than the outer edge of the membrane piece 2 and the other end 5B may be positioned outward of the outer edge of the film piece 2 and inward of the outer edge of the protective film 3. Also, in FIG. 1-1 to FIG. 1-3, the cut 5 is a straight line, but not limited to this, it may be a curve such as an arc shape or a wavy line. Furthermore, in FIG. 1-1 to FIG. 1-3, although the cut 5 is one, other cut may be provided. However, in the other cut, as in the cut 5, one end of the cut is more inward than the outer edge of the membrane piece 2 and the other end is more outward than the outer edge of the membrane piece 2 and the other end It is preferable to be inside the outer edge of the protective film 3.

  In the case where the upper adhesive layer 4 is a frame-like adhesive layer having an opening area as shown in FIG. 1-1 (a), the cut 5 has the upper adhesive as shown in FIG. 1-1 (b). It is preferable to locate outward of the outer edge 4X of the opening area of the layer 4. In the case of having a plurality of cuts, it is preferable that all the cuts be located outward of the outer edge 4X of the open area of the upper adhesive layer 4. That is, it is preferable that none of the cuts extend from the outer edge of the upper adhesive layer 4 to the inner edge of the upper adhesive layer 4, that is, the outer edge 4X of the opening area. According to this preferred embodiment, even if the cut is transferred to the adhesive layer to form a groove, sufficient water resistance and the like can be ensured, for example, when the membrane piece is a gas-permeable membrane.

  Although the depth of the cut 5 in the thickness direction of the protective film 3 is not shown in FIG. 1-1 (a), the depth may be part of the thickness of the protective film 3 It may be full thickness. Preferably, a cut is formed over the entire thickness of the protective film 3. In addition to the entire thickness of the protective film 3, the cuts 5 may extend to a part or the entire thickness of the upper adhesive layer 4 in the thickness direction.

Second Embodiment
FIGS. 2-1 (a) and (b) are diagrams showing an example of a film with a protective film according to a second embodiment of the present invention, and FIG. 2-1 (a) is a cross-sectional view, FIGS. ) Is a top view seen from the protective film 3 side.

  In FIG. 2A, the protective film-attached film piece 1 has a film piece 2, a protective film 3 whose outer edge is on the outer side than the outer edge of the film piece 2, and between the film piece 2 and the protective film 3 And a cut 5 is formed in the protective film 3, and the cut has two cut portions 5X and 5Y intersecting with the outer edge of the film piece 2. A first straight line 8X connecting the first intersection 6X at which the outer edge of the membrane piece 2 and the one cut portion 5X intersect, the center of gravity 7 of the membrane piece 2, and the other cut portion at the outer edge of the membrane piece 2 The angle θ between the second intersection 6Y where 5Y intersects and the second straight line 8Y connecting the center of gravity 7 of the membrane piece 2 is less than 180 °.

  In the above FIGS. 2-1 (a) and (b), the entire periphery of the outer edge of the protective film 3 is on the outer side than the outer edge of the film piece 2, but the present invention is not limited to this. It is sufficient if at least a part is outside the outer edge of the membrane piece 2. FIGS. 2-2 (a) and (b) and FIGS. 2-3 (a) and (b) are mentioned as another example of the film piece with a protective film of 2nd Embodiment of this invention. 2-2 (a) and 2-3 (a) are cross-sectional views, and FIGS. 2-2 (b) and 2-3 (b) are FIGS. 2-2 (a) and 2-3 (a). ) Is a top view from the protective film 3 side. As shown in FIGS. 2-2 (a) and (b) and FIGS. 2-3 (a) and (b), a part of the outer edge of the protective film 3 matches the outer edge of the film piece 2, and the outer edge of the protective film 3 The other portion of the film may be outward of the outer edge of the membrane piece 2.

  In the second embodiment, the cut portions 5X and 5Y constituting a part of the cut 5 need only satisfy the positional relationship. The angle θ is preferably in the range of, for example, 5 ° (deg) or more and 90 ° (deg) or less, and more preferably 60 ° (deg) or less. Although the number of cuts 5 is one in FIGS. 2-1 to 2-3, the present invention is not limited to this. The number of cuts may be two as shown in FIG. 3-1A.

  It is preferable that the cut 5 be connected at a region inward of the outer edge of the membrane piece 2. For example, in addition to the V-shape as shown in FIGS. 2-1 to 2-3, U-shaped cut 5 shown in FIG. 3-1 (b) or wavy cut as shown in FIG. 3-2 (a) 5 is mentioned. In addition, other cuts may be added to these cuts. For example, as shown in FIG. 3-2 (b), in addition to the cut 5, other cuts 5 a and 5 b may be added. It is preferable that the same positional relationship as that of the above-mentioned cut 5 be satisfied also for the other cut. Moreover, in the second embodiment, it is preferable that none of the cuts extend to the outer edge of the protective film 3.

  In the case where the upper adhesive layer 4 is a frame-like adhesive layer having an opening area as shown in FIG. 2-1 (a), the cut line 5 has the upper adhesive as shown in FIG. 2-1 (b). It is preferable to locate outward of the outer edge 4X of the opening area of the layer 4. In the case of having a plurality of cuts, it is preferable that all the cuts be located outward of the outer edge 4X of the open area of the upper adhesive layer 4. That is, it is preferable that none of the cuts extend from the outer edge of the upper adhesive layer 4 to the inner edge of the upper adhesive layer 4, that is, the outer edge 4X of the opening area. According to this preferred embodiment, even if the cut is transferred to the adhesive layer to form a groove, sufficient water resistance and the like can be ensured, for example, when the membrane piece is a gas-permeable membrane.

  Although the depth of the cut 5 in the thickness direction of the protective film 3 is not shown in FIG. 2A (a), the depth may be part of the thickness of the protective film 3 It may be full thickness. Preferably, a cut is formed over the entire thickness of the protective film 3. In addition to the entire thickness of the protective film 3, the cuts 5 may extend to a part or the entire thickness of the upper adhesive layer 4 in the thickness direction.

  In the protective film-attached film piece 1 of the present invention, at least a part of the outer edge of the protective film 3 may be outside the outer edge of the film piece 2, and the sizes of the protective film 3 and the film piece 2 or their differences are It is not particularly limited. However, in the operation process, from the viewpoint of ease of operation such as picking the protective film, the shortest distance between at least one of the first intersection and the second intersection and the outer edge of the protective film (for example, protection shown in FIG. In the case of the film-attached film piece 1, it is preferable that a solid double arrow line) indicating the shortest distance between the first intersection 6X and the outer edge of the protective film 3 be 1 mm or more. The shortest distance is more preferably 2 mm or more, still more preferably 3 mm or more. In addition, when storage, conveyance, etc. are considered, it is preferable that the said shortest distance is about 30 mm or less.

  FIG. 5 is a top view showing an example of the protective film-attached film piece of the 2a embodiment which is one form of the second embodiment. The second in a second embodiment is a maximum inscribed circle or a maximum inscribed ellipse (a maximum inscribed ellipse 9 in FIG. 5) in a region inside the outer edge of the protective film 3 and outside the outer edge of the membrane piece 2. And a straight line 12 passing through the first intersection point 6X and the second intersection point 6Y. The angle φ formed by the intersection of the line segment 11 and the straight line 12 is, for example, preferably in the range of 30 to 150 ° (deg), and more preferably in the range of 45 to 135 ° (deg).

  FIG. 6 is a top view showing an example of a protective film-attached film piece of the 2b embodiment which is an embodiment of the second embodiment. The second embodiment and the second embodiment are partially overlapped. In FIG. 6, the arrangement of the membrane piece 2 and the cut 5 is the same as that of FIG. In the 2b embodiment, the protective film 3 has a longitudinal direction L, and a first region 13a divided by a plane (a plane perpendicular to the paper surface in FIG. 6) F perpendicular to the longitudinal direction L And a second area 13b having a smaller area than the first area, and a first section 14a in the first area along the outer edge of the film piece and the second area in the second area. The second section 14b along the outer edge of the membrane piece is equal in length, and the cut 5 is formed in the protective film 3, and the cut 5 is the first section 14a in at least two cut sections 5X and 5Y. And intersect.

  Below, the protective film etc. which are common to the said 1st Embodiment and 2nd Embodiment are demonstrated.

[Protective film]
The protective film protects film pieces during storage and transportation, and a material such as a resin film or paper subjected to release treatment is preferably used as the material. For example, resin films made of polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyolefin resins such as polypropylene, polyethylene and polymethylpentene, polycarbonate resins, etc .; glassine paper, wood free paper, coated paper And paper such as impregnated paper and synthetic paper; metal foil such as aluminum and stainless steel; and the like. As the substrate film, one having at least one surface treated with a release agent is preferable, and as the release agent, for example, a silicone based or fluorine based one is preferable.

  The shape of the protective film is not particularly limited, and, for example, a circular shape including an ellipse, a rectangular shape, a polygonal shape, a shape in which the corners are rounded, an L shape; a shape in which these are combined; It is possible to adopt a shape having a recess in part; and further, a shape in which the end of the protective film is extended. Further, in the protective film, for example, one or more holes may be provided for positioning at the time of an operation of attaching a film piece to an adherend such as a housing. The shape of the hole may, for example, be a circle including an ellipse, a rectangle, a polygon, a shape with rounded corners, an L shape, or a combination thereof.

  The thickness of the protective film 3 is not particularly limited, but the protective film 3 preferably has a thickness of 10 μm or more, more preferably 45 μm or more, because it does not fulfill the protective function if it is too thin. On the other hand, if the thickness of the protective film 3 is too thick, the rigidity of the protective film is increased and the processability of the protective film is deteriorated or the protective film is difficult to peel off, so the thickness of each protective film is 150 μm or less Is more preferable, and more preferably 125 μm or less.

  The protective film 3 may be colored in a chromatic color. The whole or a part of the protective film may be colored in order to prevent peeling of the protective film due to oversight of the protective film.

  The protective film may have two or more layers, and at least one of them may have a cut defined in the present invention. Therefore, for example, in order from the upper adhesive layer side, a first protective film having a cut defined in the present invention; and no cut, made of the same material / shape as the first protective film, or at least any of the material and the shape It may be in a form in which a second protective film different in thickness is laminated. An example is shown in FIG. FIG. 7 is a perspective view showing one example of the protective film-attached film piece of the present invention divided into each layer for the sake of explanation, and is used for the release film 16 and the protective film 3 provided with two adhesive layers 15. Shows the shape of the membrane piece 2 by a broken line for the sake of convenience. In this FIG. 7, although the cut 5 is formed in the release film 16, the two adhesive layers 15, and the protective film 3, the cut is not formed in the other protective film 3a which is the outermost layer. Moreover, when a protective film is two or more layers, opening area | regions of the same shape as an upper side adhesive layer may be provided in protective films other than the protective film which comprises outermost surface. When there are a plurality of protective films, any of the protective films can adopt the above-described materials and shapes.

[Membrane piece]
A porous resin film, an electret nonwoven fabric, a nanofiber nonwoven fabric, etc. can be used as a constituent material of a membrane piece. As a material of the membrane piece, polyethylene, polypropylene, polystyrene, polyimide and the like can be used, but preferably a fluororesin excellent in waterproofness, more preferably a film of porous polytetrafluoroethylene (PTFE) Is recommended. It is preferable from the viewpoint of reinforcement to use a thin film obtained by laminating a porous PTFE film and another piece of membrane (for example, a breathable membrane). As a microscopic shape of the membrane piece, one having a net shape, a mesh shape or a porous shape can be used. The porous PTFE film is excellent in waterproofness, and can prevent air and moisture in and out of the electric device while preventing the intrusion of water droplets, dust, harmful gas and the like.
The membrane piece may further be provided with a reinforcing layer. As the reinforcing layer, for example, a non-woven fabric, a work cloth, a mesh, a net, a sponge, a foam, a porous body or the like made of resin or metal can be used. As a method of bonding the resin porous membrane and the reinforcing layer, there are adhesive lamination, thermal lamination and the like.

  The porous PTFE membrane generally has low surface energy as compared with general-purpose high molecular weight polypropylene (PP) and polyethylene (PE), and bonding of fine molecular chains in the material is weak. Therefore, the porous PTFE membrane is lower in strength than other polymeric porous membranes. In particular, since the porous PTFE membrane is stretched in the horizontal direction of the membrane, the tensile strength in the vertical direction of the membrane is small, and when the protective film is peeled off, the membrane piece may tear in the vertical direction of the membrane. is there. Therefore, if the present invention is applied when a porous PTFE membrane is used as the constituent material of the membrane piece, the tensile force in the membrane vertical direction at the time of peeling of the protective film is reduced, which is extremely effective for preventing the membrane piece from tearing. is there.

  The porous PTFE membrane may be a uniaxially stretched porous PTFE membrane or a biaxially stretched porous PTFE membrane. The porous PTFE membrane can be produced, for example, by the following method. That is, after removing the forming aid from the compact of the paste obtained by mixing the fine powder of PTFE with the forming aid, the porous PTFE membrane is stretched at a high temperature and a high speed, and optionally fired. It can be obtained by In the case of uniaxial stretching, nodes (folded crystals) form fine islands at right angles to the stretching direction, and fibrils fibrils like straight lines connecting the nodes (a straight chain in which the folded crystals are pulled out by stretching) (Molecular bundle) is oriented in the stretching direction. Then, the space defined by fibrils or between fibrils and nodes has a fibrous structure in which pores are formed. In addition, in the case of biaxial stretching, fibrils radially spread, and nodes connecting fibrils are scattered like islands, resulting in a spider-like fibrous structure in which a large number of spaces defined by fibrils and nodes exist. ing.

  A lyophobic agent may be added to the surface of the film piece. By giving liquid repellency to the membrane piece, various contaminants such as body oil, mechanical oil, water droplets and the like that reduce the collection characteristics and air permeability characteristics of the membrane piece penetrate into the pores of the membrane piece or It can be suppressed to be held.

  In the present specification, as a method for imparting liquid repellency, it is possible to use a liquid repellent material or to add a liquid repellent agent, and in this case, “liquid repellency” means to repel liquid. It is assumed that the property or function refers to, and the "liquid repellent" includes "water repellent", "oil repellent", "water / oil repellent" and the like. As the water and oil repellent agent, a polymer having a fluorine-containing side chain can be used. The details of the water and oil repellent polymer and the method of forming the same on a porous PTFE membrane are disclosed in WO 94/22928 and the like.

  Moreover, various functionality can be provided by adding a hydrophilic material, a conductive material, a coloring material, an antistatic material, an antibacterial material, etc. other than the said liquid repellant to a film piece.

  Membrane pieces may be stained. For example, from the viewpoint of design, the membrane piece may be dyed to match the color of the adherend such as a housing.

  The membrane pieces preferably have strength enough to be used alone (in a single layer), but may be used by laminating with a stretchable breathable reinforcing layer such as a nonwoven fabric, a net such as woven fabric or knitted fabric, etc. .

  Although the shape of the membrane piece is a circle in FIGS. 1-1 to 1-3 and FIGS. 2-1 to 2-3, it is not limited thereto. As a shape of the membrane piece, for example, a circular shape including an ellipse, a rectangular shape, a polygonal shape, a shape with rounded corners, an L shape, a shape in which these are combined; Can be adopted. In addition, one or more holes may be provided in the membrane piece. The shape of the hole may, for example, be a circle including an ellipse, a rectangle, a polygon, a shape with rounded corners, an L shape, or a combination thereof.

  The film thickness of the film piece is not particularly limited, and can be, for example, 0.1 μm to 5 mm.

  Although the figure shown by this invention is provided with one or more protective films with respect to one film piece, it is not restricted to this. For example, one protective film may be provided for two or more pieces of film.

  Examples of the film piece include: air permeable film; acoustic film; optical film such as polarizing film, antireflective film, reflective film, etc .; gas barrier film; conductive film; adhesion preventing film such as dirt; Used for

[Upper adhesive layer]
First, in the present invention, the term "adhesive layer" refers to a substance generally used to bond articles to articles and includes what is called an adhesive layer. As the upper adhesive layer, an adhesive layer (frame-like adhesive layer) having an opening area can be mentioned as illustrated in the above-mentioned FIG. 1-1 (a) and FIG. 2-1 (a). The adhesive layer having the open area may be fixed to the surface of the membrane piece. As another upper adhesive layer, as shown in FIG. 8-1 (a), an adhesive layer 4a formed on the film piece 2 side surface of the protective film 3 and peeled off together with the protective film 3 when the protective film 3 is peeled (hereinafter referred to as As described above, since the adhesive strength is not large, an adhesive layer which can be easily removed from the membrane piece 2 may be referred to as a "fine adhesive layer". Specifically, a single-sided pressure-sensitive adhesive tape using a protective film as a substrate can be mentioned.

  The shape of the opening region of the frame-like adhesive layer is not particularly limited, and it may be a circle including an ellipse, a rectangle, a polygon, a shape with rounded corners, an L shape, and a combination of these. It may be. Furthermore, the open area may be two or more. Further, the shape of the frame of the above-mentioned adhesive layer is not particularly limited, and it may be a circle including an ellipse, a rectangle, a polygon, a shape with rounded corners, an L shape, and a shape combining them. It may be. As a method of forming this frame-like adhesive layer, for example, a method of screen printing, a method of transferring a melt of an adhesive to a release sheet by a gravure pattern roll, or a double-sided adhesive tape cut into a frame beforehand is used. There is a way to do it. The thickness of the frame-like adhesive layer can be, for example, about 1 to 250 μm.

  The single-sided or double-sided pressure-sensitive adhesive tape may be a single-sided or double-sided pressure-sensitive adhesive tape having a non-woven fabric of polyethylene non-woven fabric, polypropylene non-woven fabric, nylon non-woven fabric as a core material. Use various types of materials such as single-sided adhesive tape or double-sided adhesive tape, single-sided adhesive tape or double-sided adhesive tape of nylon base, single-sided adhesive tape or double-sided adhesive tape of foam core material, substrateless double-sided adhesive tape Can.

  As an adhesive which comprises the said micro adhesion layer, well-known various adhesives, such as a silicone adhesive, an acrylic adhesive, a rubber adhesive, a urethane adhesive, can be used, for example. The film thickness of the slightly adhesive layer can be, for example, about 1 to 250 μm.

  The upper adhesive layer may be a single layer or two or more layers. When the upper adhesive layer is two or more layers, the film thickness of each layer can be about 1 to 250 μm.

[Other layer]
(Non-adhesive layer such as mold release film and elastic layer)
The present invention only needs to have a protective film having specified cuts, a film piece, and an upper adhesive layer, and as other layers, has a non-adhesive layer such as the above-mentioned release film or elastic layer. May be As the non-adhesive layer, materials of the protective film can be used, and foams (for example, urethane foam, silicone foam, acrylic foam, polyethylene foam), NBR (nitrile rubber), EPDM (ethylene-propylene rubber), silicone rubber It is also possible to use rubbers such as fluorine rubber, acrylic rubber and hydrogenated nitrile rubber.

  The shape of the release film is not particularly limited. For example, a circular shape including an ellipse, a rectangular shape, a polygonal shape, a shape with rounded corners, an L shape, a shape in which these are combined; It is possible to adopt a shape having a recess in at least a part of the above; and a shape in which the end of the release film is extended. Further, one or more holes may be provided in the release film, for example, for positioning at the time of affixing a film piece to an adherend such as a housing. The shape of the hole may, for example, be a circle including an ellipse, a rectangle, a polygon, a shape with rounded corners, an L shape, or a combination thereof. Furthermore, the release film may be provided with an open area having the same shape as the upper adhesive layer. The shape of the elastic layer can be the same as that of the frame-like adhesive layer or the same as that of the membrane piece. When a non-adhesive layer is provided, it may further have an adhesive layer for adhering the non-adhesive layer to a protective film or the like.

  As an example in the case of having the said non-adhesion layer, the structure of FIG. 8-1 (b) and FIG. 8-2 is mentioned. For example, as shown in FIG. 8-1 (b), the structure of a frame-like adhesive layer 4 / membrane piece 2 can be mentioned as a protective film 3 / adhesive layer 15 / release film 16 / upper adhesive layer. Moreover, as shown to FIG. 8-2, the structure of the frame-like adhesion layer 4 / membrane piece 2 is mentioned as protective film 3 / slight adhesion layer 4a / elastic layer 19 / upper side adhesion layer.

  The protective film-attached film piece of the present invention may further include a lower adhesive layer and a base film on the side of the film piece opposite to the upper adhesive layer as another layer.

(Base film)
The substrate film is responsible for storing and transporting thin film pieces. The material and the like of the sheet-like member are not particularly limited, but as the material of the base film, for example, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polypropylene, polyethylene, polymethyl Resin films composed of polyolefin resins such as pentene, polycarbonate resins, etc .; paper such as glassine paper, high quality paper, coated paper, impregnated paper, synthetic paper etc .; metal foil such as aluminum, stainless steel etc .; As the substrate film, one having at least one surface treated with a release agent is preferable, and as the release agent, for example, a silicone based or fluorine based one is preferable.

  The shape of the substrate film is not particularly limited, and, for example, a circular shape including an ellipse, a rectangular shape, a polygonal shape, a shape in which the corners are rounded, an L shape; a shape in which these are combined; It is possible to adopt a shape having a recess in a part; and further, a shape in which the end of the base film is extended. Further, one or more holes may be provided in the base film, for example, for positioning at the time of affixing a film piece to an adherend such as a housing. The shape of the hole may, for example, be a circle including an ellipse, a rectangle, a polygon, a shape with rounded corners, an L shape, or a combination thereof.

  The thickness of the substrate film is, for example, preferably 10 to 250 μm, more preferably 50 to 150 μm. The surface of the substrate may be subjected to corona discharge treatment, plasma treatment, flame plasma treatment or the like, or a primer layer or the like, in order to improve the adhesion to the release agent or the pressure-sensitive adhesive. As the primer layer, use is made of a polymer material (so-called anchor coating agent) such as polyethylene, polypropylene, styrene copolymer, polyester, polyurethane, polyvinyl alcohol, polyethylene imine, polyacrylate, polymethacrylate, modified products thereof, etc. Can.

(Lower adhesive layer)
As the lower adhesive layer, materials and shapes that can be used for the upper adhesive layer can be used. That is, as the lower adhesive layer, the above-mentioned frame-like adhesive layer, slightly adhesive layer or the like can be used. 9A and 9B are cross-sectional views illustrating a structure in which a frame-like adhesive layer is further provided as a lower adhesive layer in the structure shown in FIGS. 1-1A and 2-1A. It is. 9 (a) shows a structure in which a frame-like adhesive layer 17 and a base film 18 are further provided as a lower adhesive layer, and FIG. 9 (b) shows a frame-like adhesive layer 17 and a protective film 3 as a lower adhesive layer. The structure provided is shown.

  10 (a) and 10 (b) are cross-sectional views illustrating the structure shown in FIG. 8-1 (a) further provided with a frame-like adhesive layer as a lower adhesive layer and a base film etc. It is. 10 (a) shows a structure in which a frame-like adhesive layer 17 and a base film 18 are further provided as a lower adhesive layer, and FIG. 10 (b) shows a frame-like adhesive layer 17 and a protective film 3 as a lower adhesive layer. The structure provided is shown.

  For example, as shown in FIGS. 11 (a) and 11 (b), a thin adhesive layer 17a is provided in place of the lower adhesive layer (frame-like adhesive layer) 17 in FIGS. 9 (a) and 9 (b). It may be done. Further, when the frame-like adhesive layer is not provided as the upper adhesive layer or the lower adhesive layer, for example, as shown in FIG. 12A, the slightly adhesive layer 4a / film piece 2 / lower as the protective film 3 / upper adhesive layer. As the structure of the slight adhesion layer 17a / substrate film 18 as the side adhesion layer, or as shown in FIG. 12 (b), the protection film 3 / the slight adhesion layer 4a as the upper adhesion layer / the film piece 2 / the lower adhesion layer The structure of the slightly adhesive layer 17 a / protective film 3 may be employed. In the configurations of FIGS. 11 (a) and (b) and FIGS. 12 (a) and 12 (b), for example, a frame-shaped adhesive layer as a lower adhesive layer is already provided in a housing or the like in which a membrane piece is installed. Applicable to cases.

  When the lower adhesive layer is provided together with the upper adhesive layer, as described later, after removing the base film from the film with a protective film of the present invention and fixing the lower adhesive layer to the housing, The adhesion between the upper adhesive layer 4 and the protective film 3 is different from that of the lower adhesive layer 17, for example, the base film 18 (FIG. 9 (b) in FIG. 9 (b)). Preferably, it is larger than the adhesion between 3) and 4). According to the present invention, the protective film 3 is removed when the protective film 3 is removed even if the adhesion between the upper adhesive layer 4 and the protective film 3 is enhanced because the protective film 3 has a predetermined cut. Can be easily peeled off. That is, according to the present invention, the balance design of the adhesive force of the protective film-attached film piece is facilitated.

[Method of removing protective film and method of manufacturing electrical device using the membrane-attached piece of protective film of the present invention]
The present invention also includes a method for removing a protective film with a protective film, including the step of grasping a region outward of the outer edge of the film in the protective film and peeling off the protective film. As described above, in the protective film-attached film piece of the present invention, a cut satisfying the prescribed positional relationship is formed in the protective film, so that the film piece may be damaged or the like when removing the protective film of the protective film attached film And the protective film can be removed with good workability.

  The present invention also includes a method of manufacturing an electrical device including the step of grasping a region on the protective film that is more outward than the outer edge of the film piece and peeling off the protective film. For example, in the case where the protective film-attached film piece 1 having the lower adhesive layer 17 and the base film 18 as shown in FIG. 9A is attached to the housing 20 constituting the electronic device which is the adherend, After the film 18 is removed and the lower adhesive layer 17 is fixed to the housing 20 as shown in FIG. 13, the protective film 3 may be peeled off.

1 film piece with protective film 2 film piece 3, 3a protective film 4 upper adhesive layer 4X outer edge 4a of opening region of upper adhesive layer 4a, 17a slightly adhesive layer 5, 5a, 5b cut 5A cut one end 5B cut other end 5X cut The first intersection 6Y where the outer edge of the 5X cut portion 6X crosses the outer edge of the membrane piece and the cut portion The second intersection point 7 where the outer edge of the membrane piece intersects the cut portion 7 A second straight line 9 connecting a first straight line 8Y connecting the second point to the center of gravity of the membrane piece 9 A maximum inscribed circle or maximum inscribed ellipse 10 A maximum inscribed circle or center of the maximum inscribed ellipse 11 maximum inscribed circle or maximum Line segment 12 connecting the center of the inscribed ellipse and the center of gravity of the membrane piece straight line 13a passing through the first intersection 6X and the second intersection 6Y first region 13b in the second embodiment b second region 14a in the second embodiment b Third Embodiment 1 section 14b Second section 15 in the 2b embodiment Adhesive layer 16 Release film 17 Lower adhesive layer 18 Base film 19 Elastic layer 20 Housing

Claims (17)

A protective film-attached film piece comprising a film piece, a protective film in which at least a part of the outer edge is outside the outer edge of the film piece, and an upper adhesive layer located between the film piece and the protective film. ,
A cut is formed in the protective film, and one end of the cut is inward of the outer edge of the membrane piece, and the other end is outward of the outer edge of the membrane piece and of the protective film A piece with a protective film characterized in that it is on the inner side than the outer edge. A protective film-attached film piece comprising a film piece, a protective film in which at least a part of the outer edge is outside the outer edge of the film piece, and an upper adhesive layer located between the film piece and the protective film. ,
The cut is formed in the protective film, and the cut is
Having two cuts intersecting with the outer edge of the membrane piece,
A first straight line connecting a first intersection point at which the outer edge of the membrane piece and one of the cuts intersect, and a center of gravity of the membrane piece;
A protective film-attached film piece characterized in that an angle formed by a second intersection point at which the outer edge of the film piece and the other cut part intersects a second straight line connecting the center of gravity of the film piece is less than 180 °. .   The piece with a protective film according to claim 2, wherein the shortest distance between at least one of the first intersection and the second intersection and the outer edge of the protective film is 1 mm or more. A line segment connecting the center of the largest inscribed circle or the largest inscribed ellipse in a region inside the outer edge of the protective film and outside the outer edge of the membrane piece, and the center of gravity of the membrane piece;
The piece with a protective film according to claim 2, wherein the first intersection and a straight line passing through the second intersection intersect. The protective film has a longitudinal direction and has a first region divided at a plane perpendicular to the longitudinal direction, and a second region having a smaller area than the first region, In the first region, the first section along the outer edge of the membrane piece and in the second region, the second section along the outer edge of the membrane piece are equal in length
The piece with a protective film according to claim 2, wherein a cut is formed in the protective film, and the cut intersects the first section at at least two cut portions.   The piece with a protective film according to any one of claims 2 to 5, wherein the cut is connected in a region that is more inward than the outer edge of the piece of the film.   The piece with a protective film according to any one of claims 1 to 6, wherein the cut extends over the entire thickness of the protective film.   The protective film-attached film piece according to any one of claims 1 to 7, further comprising a lower adhesive layer and a base film on the side of the film piece opposite to the upper adhesive layer.   The piece with a protective film according to any one of claims 1 to 8, wherein the upper adhesive layer has an open area.   The piece with a protective film according to claim 9, wherein the cut is positioned outward of the outer edge of the open area of the upper adhesive layer.   The piece with a protective film according to any one of claims 1 to 10, wherein the upper adhesive layer is formed on the protective film, and the cut extends to the upper adhesive layer.   The film piece with a protective film according to any one of claims 1 to 11, wherein the film piece is a gas-permeable film.   The film piece with a protective film according to any one of claims 1 to 12, wherein the film piece is a porous polytetrafluoroethylene film.   The film with a protective film according to any one of claims 1 to 13, wherein the film has a liquid repellent agent added to the surface.   The piece with a protective film according to any one of claims 1 to 14, wherein the protective film is colored in a chromatic color.   The method according to any one of claims 1 to 15, further comprising the step of grasping a region on the protective film outside the outer edge of the film piece and peeling off the protective film. Method of removing a protective film with a protective film attached.   The method according to any one of claims 1 to 15, further comprising the step of grasping a region on the protective film outside the outer edge of the film piece and peeling off the protective film. Method of manufacturing an electrical device.

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