Method of manufacturing laminate film, and apparatus of manufacturing the same

Abstract

To prevent occurrence of scratches when two films are bonded together to fabricate a laminate film.SOLUTION: A method of manufacturing a laminate film comprises: a step of placing a surface opposite to a bonding surface of a first film 1 on a first table part 31, and sucking the opposite surface of the first film 1 onto a surface of the first table part 31; a step of placing a surface opposite to a bonding surface of a second film 2 on a surface of a second table part 32; and a bonding step of allowing the bonding surface of the first film 1 and the bonding surface of the second film 2 to face each other, pressing a pressing member 6 against the surface opposite to the second film 2, moving the same together with the second table part 32 along the surface opposite to the second film 2, so as to bond the first film 1 and the second film 2 to each other. In the bonding step, the pressing member 6 is moved without sucking the second film 2 onto the surface of the second table part 32.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for laminating films to produce a laminated film. [Background technology]

[0002] Conventionally, a laminated film in which two films are bonded together is produced by placing the bonding surfaces of the two films facing each other and moving a pressing member against the opposite surface of the film (the surface opposite to the bonding surface). For example, Patent Document 1 discloses a bonding device having a table 14 that holds an adherend E, a holder 23 that is movable relative to the table 14 and holds a sheet material S, and a pressing member 17 that is integral with the holder 23 and applies a pressing force to the sheet material S superimposed on the adherend E by the relative movement of the table 14 and the holder 23. This bonding device holds the adherend E on the table 14 by suction, and holds the sheet material S on the holder 23 by suction, and from this state, the sheet material S can be bonded to the adherend E by pressing a pressing member 17 against the protruding portion N2 of the sheet material 14 and moving the pressing member 17 together with the holder 23. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-131599 A Summary of the Invention

[0004] When the sheet material S is bonded to the adherend E, tension is applied to both the adherend E and the sheet material S, thereby preventing wrinkles and air bubbles from being trapped. However, in the conventional method, fine streak-like scratches may occur on the surface of the sheet material S. When such scratches occur, the product value of the laminated film decreases. In particular, when manufacturing a laminated film to be used as an optical film, a film with as few scratches as possible is required. [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a method and an apparatus for producing a laminated film that is less susceptible to scratches. [Means for solving the problem]

[0006] A first embodiment of the manufacturing method of a laminated film is a manufacturing method of a laminated film in which a first film and a second film are bonded to produce a laminated film, the manufacturing method comprising: a first preparation step of placing a surface of the first film opposite to a bonding surface on a first table section and adsorbing the opposite surface of the first film to a surface of the first table section by an adsorption means; a second preparation step of placing a surface of the second film opposite to a bonding surface on a surface of the second table section; and a bonding step of bonding the first film and the second film by bringing the bonding surface of the first film adsorbed to the first table section and the bonding surface of the second film placed on the second table section into contact with each other, applying a pressing member to the opposite surface of the second film, and moving the pressing member together with the second table section along the opposite surface of the second film, and bonding the first film and the second film together; and in the bonding step, the pressing member is moved without adsorbing the second film to the surface of the second table section.

[0007] A second aspect of the present invention relates to a method for producing a laminated film, in the above-mentioned first aspect, wherein the surface roughness Ra of an area on which the second film is placed of the surface of the second table is 3.5 μm or less. In the third aspect of the method for manufacturing a laminated film, in the lamination step of the manufacturing method of either the first or second aspect, air is blown from the second table portion toward the opposite side of the second film immediately before or simultaneously with the movement of the pressing member.

[0008] In the fourth aspect of the manufacturing method for a laminated film, in a second preparation step of any of the manufacturing methods of the first to third aspects, the opposite side of the second film is adsorbed to the second table portion by an adsorption means, and in the bonding step, the adsorption of the second film is released immediately before or simultaneously with the movement of the pressing member. A fifth aspect of the present invention relates to a method for producing a laminated film, and in the method for producing a laminated film according to the fourth aspect, the adsorption means applies a suction force to the second film to attract the second film toward the second table portion, and the suction force is 30000 N / m 2 More than 80000N / m 2 The following is the result.

[0009] A sixth aspect of the present invention relates to a method for producing a laminated film, in which, in the third aspect, the air blowing pressure is 0.005 MPa or more and 0.5 MPa or less. A seventh aspect of the present invention relates to a method for producing a laminated film, in which at least one of the first film and the second film includes a polarizing film, in any one of the first to sixth aspects.

[0010] In another aspect, an apparatus for producing a laminated film is provided. A laminated film manufacturing apparatus according to a first embodiment is an apparatus for manufacturing a laminated film by bonding a first film and a second film, the apparatus comprising: a first table portion on which the first film is placed; an adsorption means provided on the first table portion and adsorbing a surface opposite to a bonding surface of the first film; a second table portion on which the second film is placed; a moving means for moving the first table portion, which has adsorbed the first film, to face the second table portion so that the bonding surface of the first film faces the bonding surface of the second film; a pressing member for pressing the surface of the second film opposite to the bonding surface; and a sliding means for moving the pressing member together with the second table portion along the opposite surface of the second film, wherein the surface roughness Ra of the area of ​​the surface of the second table portion on which the second film is placed is 3.5 μm or less.

[0011] A laminated film manufacturing apparatus according to a second embodiment is an apparatus for manufacturing a laminated film by bonding a first film and a second film, the apparatus comprising: a first table on which the first film is placed; a suction means provided on the first table and suctioning a surface of the first film opposite to a bonding surface; a second table on which the second film is placed; a moving means for moving the first table, which has suctioned the first film, to face the second table so that the bonding surface of the first film faces the bonding surface of the second film; a pressing member for pressing the surface of the second film opposite to the bonding surface; and a sliding means for moving the pressing member together with the second table along the opposite surface of the second film, and an air blowing means for blowing air from the second table toward the opposite surface of the second film immediately before or simultaneously with the movement of the pressing member. Preferably, the air blowing pressure is 0.005 MPa or more and 0.5 MPa or less. Effect of the Invention

[0012] According to the manufacturing method and manufacturing apparatus of the present invention, a laminated film in which scratches are unlikely to occur on the opposite side of the second film and in which fine scratches are suppressed can be manufactured. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a plan view of a laminated film manufacturing apparatus according to a first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] Cross-sectional view taken along line IV-IV in Figure 1. [Diagram 5] FIG. 11 is a front view showing a process in which the first table with the first film adsorbed thereon is moved to face the second table. [Figure 6] FIG. 4 is a front view showing the state after the first table portion has been made to face the second table portion. [Figure 7]13 is a front view showing a state in which the pressing member has been raised and the ends of the first film and the second film have been joined together. FIG. [Figure 8] FIG. 11 is a front view showing a process of bonding the first film and the second film by moving the pressing member and the second table. [Figure 9] FIG. 11 is a front view, including a partial cross section, showing a state in which air is blown onto the opposite surface of the second film in the manufacturing apparatus and manufacturing method of the second embodiment. [Figure 10] FIG. 13 is a front view showing a state after the first table portion has been made to face the second table portion in the manufacturing apparatus and manufacturing method according to the third embodiment. [Figure 11] FIG. 13 is a front view showing a state after the first table portion has been made to face the second table portion in the manufacturing apparatus and manufacturing method according to the fourth embodiment. [Figure 12] FIG. 13 is a left side view of a manufacturing apparatus according to a fifth embodiment, the entire apparatus being tiltable. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] [Laminated film] The laminated film produced by the present invention is obtained by laminating two films together. In this specification, one of the two films to be laminated is referred to as the "first film" and the other as the "second film." The first film and the second film may each independently be a single-layer structure or a multi-layer structure. A multi-layer structure film is composed of two or more layers. From the viewpoint of functionality, the first film and the second film may be, independently of each other, a film having an optical function (hereinafter referred to as "optical functional film"), or a film having no optical function (hereinafter referred to as "film other than optical functional film"). Examples of the optical functional film include a polarizing film, a retardation film, an anti-reflection film, a light diffusion film, a brightness improvement film, a light reflection film, and a protective film. The polarizing film is a film having a property of transmitting light (polarized light) vibrating in a specific direction and blocking light vibrating in other directions. The retardation film is a film exhibiting optical anisotropy, and representative examples thereof include stretched films of acrylic resins, cycloolefin resins, cellulose resins, and the like. The optical functional film may be composed of only one type selected from the polarizing films, etc., or may be a film in which two or more types selected from the polarizing films, etc. are laminated and bonded, or may be a film in which at least one type selected from the polarizing films, etc. and at least one type selected from the films other than the optical functional film are laminated and bonded. Examples of films other than optically functional films include release liners, isotropic films, and glass films. In terms of material, at least one of the first film and the second film includes a resin film. The first film and the second film are, for example, flexible. The thicknesses of the first film and the second film are not particularly limited, but are each independently, for example, from 10 μm to 1 mm, and preferably from 30 μm to 500 μm.

[0015] As a specific example, one of the first film and the second film is an optically functional film including a polarizing film, and the other is a surface protection film. For example, the first film is an optically functional film including a polarizing film, and the second film is a surface protection film. The surface protective film may be, for example, an isotropic colorless transparent film.The isotropic colorless transparent film may be, for example, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate; a cellulose resin such as triacetyl cellulose; a polycarbonate resin; an acrylic resin such as polymethyl methacrylate; a styrene resin such as polystyrene; an olefin resin such as polyethylene or a polyolefin having a cyclic or norbornene structure; a vinyl chloride resin; an amide resin such as nylon 6; an imide resin; a sulfone resin; a vinyl alcohol resin; a vinylidene chloride resin; a vinyl butyral resin; an arylate resin; a polyoxymethylene resin; or the like may be used as the main resin component of the resin film.

[0016] [First embodiment] <Laminated film manufacturing equipment> 1 to 4 show a manufacturing apparatus A according to a first embodiment. Referring to Figures 1 to 4, manufacturing apparatus A produces a laminated film having a first film 1 and a second film 2 by placing the bonding surface of a first film 1 and the bonding surface of a second film 2 facing each other and bonding the two bonding surfaces together. The manufacturing apparatus A has a first table portion 31 on which the first film 1 is placed, an adsorption means 41 provided on the first table portion 31 and adsorbing the side of the first film 1 opposite the bonding surface, a second table portion 32 on which the second film 2 is placed, an adsorption means 42 provided on the second table portion 32 and adsorbing the side of the second film 2 opposite the bonding surface, a moving means 5 for moving the first table portion 31 so that the bonding surface of the first film 1 and the bonding surface of the second film 2 face each other and bringing the first table portion 31 with the first film 1 adsorbed thereon into contact with the second table portion 32, a pressing member 6 for pressing the side of the second film 2 opposite the bonding surface, and a sliding means 7 for moving the pressing member 6 together with the second table portion 32 along the opposite surface of the second film 2.

[0017] Hereinafter, the suction means 41 provided on the first table portion 31 will be referred to as the "first suction means 41," and the suction means 42 provided on the second table portion 32 will be referred to as the "second suction means 42." Additionally, the components of the first table portion 31 and the first suction means 41 will be prefixed with "first," and the components of the second table portion 32 and the second suction means 42 will be prefixed with "second." The "adhesive surface of the first film" refers to the surface of the first film 1 that is attached to the second film 2, and the "opposite surface of the first film to the adhesive surface" refers to the surface of the first film 1 that is opposite to the adhesive surface. The "adhesive surface of the second film" refers to the surface of the second film 2 that is attached to the first film 1, and the "opposite surface of the second film to the adhesive surface" refers to the surface of the second film that is opposite to the adhesive surface. Hereinafter, the "opposite surface of the first film to the adhesive surface" and the "opposite surface of the second film to the adhesive surface" may be referred to as the "opposite surface of the first film" and the "opposite surface of the second film" respectively.

[0018] {First table section} The first table portion 31 is made of a plate having a flat surface larger than the area of ​​the first film 1. The first table portion 31 is made of a material having excellent mechanical strength, such as a metal such as stainless steel, or a hard resin. The first film 1 is placed on the surface of the first table 31. In FIG. 2, the surface of the first table 31 is denoted by the reference symbol 31a. The surface of the first table 31 is provided with a first guide portion 311 for positioning the first film 1 (the first guide portion is not shown in the front view and the left side view). As shown in FIG. 1, the first guide portion 311 is provided in two places in a direction perpendicular to the first film 1 in a plan view, corresponding to two sides of the first film 1. The first guide portion 311 is made of a thin plate having a thickness substantially the same as that of the first film 1 or a thickness slightly thicker than that of the first film 1. The first film 1 can be set at a predetermined position on the first table 31 by abutting the two perpendicular sides of the first film 1 against the edges of the two first guide portions 311, respectively. In FIG. 1, for convenience, the first film 1 when set at a predetermined position on the first table 31 is represented by a virtual two-dot chain line. The positioned first film 1 is placed on a predetermined area on the surface of first table portion 31. Hereinafter, the area of ​​the surface of first table portion 31 on which first film 1 is placed is referred to as the "first placement area."

[0019] {First adsorption means} First suction means 41 is a means for suctioning first film 1 placed in the first placement area, and holding first film 1 at a predetermined position in the first placement area. The first suction means 41 provided on the first table portion 31 has a first cavity 414 formed inside the first table portion 31, a first air hole 415 communicating with the surface of the first table portion 31 and the first cavity 414, and a first suction device (not shown) such as a vacuum pump that sucks air from inside the first cavity 414. By sucking the air from inside the first cavity 414 with the first suction device, the inside of the first cavity 414 becomes negative pressure, and the first film 1 is drawn toward the first table portion 31 through the first air hole 415. As a result, the first film 1 placed in the first placement area is sucked onto the surface of the first table portion 31. On the other hand, when the suction by the first suction device is stopped, the inside of the first cavity 414 returns to normal pressure, the suction of the first film 1 is released, and the first film 1 can be easily removed from the first table portion 31. A plurality of first ventilation holes 415 are formed within the range of the first placement area. The size and number of the first ventilation holes 415 can be appropriately set. The diameter of the first ventilation holes 415 is, for example, 0.3 mm or more and 2 mm or less, and the number of the first ventilation holes 415 is, for example, 1 cm 2 By forming first ventilation holes 415 in the above-mentioned size and number, first film 1 can be appropriately sucked and held to first table portion 31 without leaving suction marks or the like on first film 1.

[0020] {Transportation} The first table section 31 can be moved above the second table section 32 by the moving means 5. For example, the first table section 31 and the second table section 32 are arranged side by side in the left-right direction. By rotating the first table section 31 around the left end of the first table section 31, the first table section 31 moves above the second table section 32. In order to rotate the first table section 31 in this manner, the moving means 5 has a rotating shaft 56, a rotation support section 57 that supports the rotating shaft 56, and a driving section 58 that rotates the rotating shaft 56 forward and backward. The rotating shaft 56 extends in the width direction. Here, the width direction refers to a direction perpendicular to the up-down direction and the left-right direction. The left-right direction refers to a direction perpendicular to the up-down direction and one direction in which the pressing member 6 described later slides. In the illustrated example, the pressing member 6 slides in the left-right direction of the paper in the front view shown in FIG. 2.

[0021] The rotating shaft 56 has one end rotatably supported by a rotating support part 57, and the opposite end is a free end. However, both ends of the rotating shaft 56 may be supported. The rotating support part 57 is fixed to a base table 8 of the device A. The rotating support part 57 is provided with a driving part 58 (motor, etc.) that rotates the rotating shaft 56 counterclockwise and clockwise around the axis. The left end of the first table part 31 is fixed to the rotating shaft 56 via a connecting part 318. When the rotating shaft 56 rotates about 180 degrees counterclockwise as viewed from the front in FIG. 2, the first table part 31 moves above the second table part 32, and when the rotating shaft 56 rotates about 180 degrees clockwise as viewed from the front in FIG. 2, the first table part 31 returns to its original position. The original position is the position shown in FIG. 1 to FIG. 4 (hereinafter, this position is referred to as the "home position").

[0022] {Second table section} The second table portion 32 is made of a plate having a flat surface larger than the area of ​​the second film 2. The second film 2 is placed on the surface of the second table portion 32. In FIG. 2, the surface of the second table portion 32 is denoted by the reference symbol 32a. The surface of the second table portion 32 is provided with a second guide portion 321 for positioning the second film 2 (the second guide portion is not shown in the front view and the left side view). As shown in FIG. 1, the second guide portion 321 is provided in two places in a direction perpendicular to the plane view, corresponding to the two sides of the second film 2. The second guide portion 321 is made of a thin plate having approximately the same thickness as the second film 2 or a thickness slightly thicker than the second film 2. The second film 2 can be set at a predetermined position on the second table portion 32 by abutting the two perpendicular sides of the second film 2 against the edges of the two second guide portions 321, respectively. 1, for the sake of convenience, the second film 2 when set at a predetermined position on the second table portion 32 is represented by an imaginary two-dot chain line. The positioned second film 2 is placed on a predetermined area on the surface of the second table portion 32. Hereinafter, the area of ​​the surface of the second table portion 32 where the second film 2 is placed is referred to as the "second placement area."

[0023] The second table portion 32 is formed from a material having excellent mechanical strength, such as a metal such as stainless steel, or a hard resin. At least the second placement region of the surface of the second table portion 32 has a surface roughness Ra of 3.5 μm or less, preferably 2.5 μm or less, and more preferably 1.5 μm or less. In the illustrated example, the surface roughness Ra is 3.5 μm or less, preferably 2.5 μm or less, and more preferably 1.5 μm or less over the entire surface of the second table portion 32. The lower limit of the surface roughness Ra is theoretically zero, but usually exceeds zero μm. The surface roughness Ra refers to the arithmetic mean roughness Ra measured in accordance with JIS B 0601:2013. The surface roughness Ra can be obtained by measuring the surface of the second table portion 32 using, for example, a commercially available surface roughness meter. Hereinafter, "a surface roughness Ra of 3.5 μm or less, preferably 2.5 μm or less, more preferably 1.5 μm or less" may be referred to as "a predetermined surface roughness Ra".

[0024] In order to set the surface of the second table portion 32 to the predetermined surface roughness Ra, in the illustrated example, a smooth finishing material 329 is laminated and bonded to the second table portion 32. The smooth finishing material 329 is laminated at least in the second placement area, and in the illustrated example, it is laminated over the entire second table portion 32. One side of this layered smooth finishing material 329 forms the surface of the second table portion 32. As the smooth finishing material 329, for example, a smooth sheet such as a glass film or a resin film can be used. The glass film and the resin film have excellent smoothness, and by laminating the resin film on the second table portion 32, the second table portion 32 having the predetermined surface roughness Ra can be easily configured. The material of the resin film is not particularly limited, and resin films whose main resin component is a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, a cellulose resin such as triacetyl cellulose, a polycarbonate resin, an acrylic resin such as polymethyl methacrylate, a styrene resin such as polystyrene, an olefin resin such as polyethylene or a polyolefin having a cyclic or norbornene structure, a vinyl chloride resin, or an amide resin such as nylon 6 can be used. The thickness of the smooth finishing material 329 is not particularly limited, and is, for example, 10 μm or more and 2 mm or less.

[0025] As described above, the second table portion 32 is made of a material such as metal or hard resin, but if the surface of the second table portion 32 itself can be made to have a predetermined surface roughness Ra, the smoothing material 329 does not need to be provided on the second table portion 32. For example, the surface of the second table portion 32 itself can be made to have a predetermined surface roughness Ra by performing a high-precision smoothing process on the surface of the second table portion 32 made of metal or the like. However, the method of providing the smoothing material 329 such as a resin film on the second table portion 32 as described above is preferable because it allows the second table 32 to easily be configured to have a predetermined surface roughness Ra.

[0026] The second table portion 32 is fixed to the stage portion 71 via a connecting portion 328. The stage portion 71 is made of, for example, a plate-shaped member and is arranged horizontally. The surface of the second table portion 32 may be parallel to the stage portion 71 (that is, the surface of the second table portion 32 may be horizontal). In the illustrated example, the second table portion 32 is fixed to the stage portion 71 at a slight inclination so that the surface of the second table portion 32 is inclined in the left-right direction. The inclination of the second table portion 32 gradually decreases from the left side to the right side in the front view shown in FIG. 2. As will be described later, the left side of the second table portion 32 in the front view is the side on which the pressing member 6 is provided, and the right side of the second table portion 32 is the side on which the pressing member 6 and the second table portion 32 are moved. Therefore, the surface of the second table portion 32 is an inclined surface that gradually decreases from the side on which the pressing member 6 is provided to the opposite side (the side on which the pressing member 6 and the second table portion 32 are moved).

[0027] {Second adsorption means} Second suction means 42 is means for suctioning second film 2 placed in the second placement area, and holding second film 2 at a predetermined position in the second placement area. The second suction means 42 provided on the second table portion 32 has a second cavity 424 formed inside the second table portion 32, a second air hole 425 communicating with the surface of the second table portion 32 and the second cavity 424, and a second suction device (not shown) such as a vacuum pump that sucks air from within the second cavity 424. When a smooth finishing material 329 is provided, the second air hole 425 also penetrates the smooth finishing material 329. By sucking air from within the second cavity 424 with the second suction device, the second cavity 424 becomes negative pressure, and the second film 2 is attracted toward the second table portion 32 through the second air hole 425. As a result, the second film 2 placed in the second placement area is sucked onto the surface of the second table portion 32. On the other hand, when the suction by the second suction device is stopped, the pressure inside the second cavity 424 returns to normal pressure, the suction of the second film 2 is released, and the second film 2 can be easily removed from the second table portion 32. A plurality of second ventilation holes 425 are formed within the range of the second placement area. The size and number of the second ventilation holes 425 can be appropriately set. The diameter of the second ventilation holes 425 is, for example, 0.3 mm or more and 2 mm or less, and the number of the second ventilation holes 425 is 1 cm. 2 By forming second air holes 425 in the above-mentioned size and number, second film 2 can be appropriately sucked and held to second table portion 32 without leaving suction marks or the like on second film 2.

[0028] {Pressing member} The pressing member 6 is a member that presses the opposite surface of the second film 2. When the pressing member 6 presses the opposite surface of the second film 2, the bonding surface of the first film 1 facing the second film 2 and the bonding surface of the first film 1 are bonded to each other. The pressing member 6 is linear in plan view and extends in the width direction. The pressing member 6 is made of a rod-shaped member, preferably a rotatable rod-shaped member. In the illustrated example, a roller is used as the pressing member 6. Specifically, the pressing member 6 has a shaft portion 61, a rotatable roller body 62, and a base 63 having shaft support portions that support both ends of the shaft portion 61. Furthermore, a lifting mechanism is provided to move the pressing member 6 in parallel in the vertical direction. The lifting mechanism has a base portion 64 that is fixed to the stage portion 71 and is equipped with a lifting mechanism (not shown), and a piston shaft portion 65 that protrudes from the base portion 64 and can move in and out in the vertical direction. A base 63 having a shaft support portion is attached to the upper end of the piston shaft portion 65. When the piston shaft portion 65 is lifted by the lifting mechanism, the pressing member 6 also lifts. When the piston shaft portion 65 descends, the pressing member 6 also descends, and the pressing member 6 returns to its home position. In the pressing member 6, at least the roller body 62 rotates freely. For example, the cylindrical roller body 62 is attached to the shaft portion 61 via a bearing (not shown) or the like, and the roller body 62 can rotate forwards and backwards around the axis of the shaft portion 61. Alternatively, the cylindrical roller body 62 may be fixed to the shaft portion 61, and the shaft portion 61 may be attached to the shaft support portion via a bearing (not shown) or the like so as to be rotatable forwards and backwards. The roller body 62 is made of rubber, elastomer, resin, metal, or the like. The shaft portion 61 is usually made of metal.

[0029] The pressing member 6 is disposed on the left side of the second table portion 32 in the front view shown in Fig. 2. For example, the pressing member 6 is disposed so that the upper end of the pressing member 6 is horizontal with the surface of the left end portion of the second table portion 32. If there is a large gap between the pressing member 6 made of a roller and the left side surface of the second table portion 32, a bridging portion 68 is provided.

[0030] {Slide means} The slide means 7 moves the pressing member 6 together with the second table section 32. The slide means 7 has the above-mentioned stage section 71 and an operating section 72 that slides the stage section 71 in parallel along the base stand 8. The operating section 72 slides the stage section 71 in the left-right direction without tilting the stage section 71 (while keeping the stage section 71 horizontal). The operating section 72 has, for example, wheels 72 that are provided on the stage section 71 and roll, and an actuator (not shown) such as a cylinder that pushes and pulls the stage section 71 left-right. A guide groove 81 that extends linearly in the left-right direction is formed in the base stand 8, and the wheels 72 roll along the guide groove 81. Since the pressing member 6 and the second table section 32 are fixed to the stage section 71, by sliding the stage section 71 to the right along the base stand 8 by the slide means 7, the pressing member 6 and the second table section 32 simultaneously move in parallel to the right. Furthermore, by sliding the stage portion 71, which has been slid to the right, to the left along the base 8, the pressing member 6 and the second table portion 32 simultaneously move in parallel to the left and return to their home positions.

[0031] <Laminated Film Manufacturing Method and Operation of Manufacturing Apparatus> The manufacturing method of the laminated film obtains a laminated film by bonding a first film 1 and a second film 2. The manufacturing method includes a first preparation step of placing the opposite side of the first film 1 to be bonded on a first table 31 and adsorbing the opposite side of the first film 1 to the surface of the first table 31 by a first adsorption means 41, a second preparation step of placing the opposite side of the second film 2 to be bonded on the surface of the second table 32, and a bonding step of placing the bonding surface of the first film 1 adsorbed on the first table 31 and the bonding surface of the second film 2 placed on the second table 32 facing each other, and then applying a pressing member 6 to the opposite side of the second film 2 and moving the pressing member 6 together with the second table 32 along the opposite side of the second film 2 to bond the first film 1 and the second film 2 together. In one preferred embodiment, the pressing member 6 is moved without adsorbing the second film 2 to the surface of the second table 32 in the laminating step. A preferred aspect of the first embodiment is that the surface roughness Ra of the area of ​​the surface of the second table portion 32 on which the second film 2 is placed is 3.5 μm or less, and another preferred aspect is that in the bonding process, the pressing member 6 is moved without adsorbing the second film 2 to the surface of the second table portion 32. Either the first preparation step or the second preparation step may be performed first, or the steps may be performed simultaneously in parallel. In addition, in the second preparation step, the opposite surface of the second film 2 may be sucked onto the second table 32 by the second suction means 42, if necessary.

[0032] An adhesive such as a pressure sensitive adhesive or a bonding agent is provided on at least one of the bonding surface of the first film 1 and the bonding surface of the second film 2. When the bonding surface of the first film 1 (or the bonding surface of the second film 2) has self-adhesive properties with respect to the bonding surface of the second film 2 (or the bonding surface of the first film 1), the bonding surface of the first film 1 and the bonding surface of the second film 2 can be bonded together without providing the adhesive.

[0033] {First preparation step} Fig. 5 is a front view showing a state in which the first film 1 is set on the first table portion 31, and the second film 2 is set on the second table portion 32. In Fig. 5, the movement path of the first table portion 31 is shown by a dashed line. In Fig. 5, the smooth finishing material 329 is omitted and not shown (the same applies to Figs. 6 to 8). As shown by the two-dot chain line in FIG. 1, the first film 1 is set in a predetermined area (first placement area) of the first table portion 31 by positioning the edge of the first film 1 against the edge of the first guide portion 311 of the first table portion 31 in the home position. At this time, as shown in FIG. 5, the opposite surface 1b of the first film 1 is placed on the surface 31a of the first table portion 31 so that the opposite surface 1b of the first film 1 contacts the surface 31a of the first table portion 31. Next, the first suction device of the first suction means 41 is operated to apply a suction force to the first film 1 to attract the first film 1 toward the first table portion 31. The suction causes the opposite surface 1b of the first film 1 to be sucked to the surface 31a of the first table portion 31. By sucking the first film 1, it is possible to prevent the first film 1 from shifting in position, and further, it is possible to prevent the first film 1 from falling off when the first table portion 31 is moved above the second table portion 32. The suction force for the first film 1 is not particularly limited, but if it is too small, the first film 1 may not be sufficiently adsorbed and held, and if it is too large, suction marks or the like may be left on the first film 1. From this viewpoint, the suction force for the first film 1 is set to, for example, 20,000 N / m 2 More than 100000N / m 2 less than or equal to 30000N / m 2 More than 80000N / m 2 The following is the result. As the first film 1, for example, an optically functional film including a polarizing film can be used.

[0034] {Second preparation process} As shown by the two-dot chain line in FIG. 1, the second film 2 is set in a predetermined area (second placement area) of the second table portion 32 by positioning the second film 2 by abutting an edge of the second guide portion 321 of the second table portion 32 in the home position. At this time, as shown in FIG. 5, the opposite surface 2b of the second film 2 is placed on the surface 32a of the second table portion 32 so that the opposite surface 2b of the second film 2 contacts the surface 32a of the second table portion 32. In addition, the second film 2 is set so that the end 2c of the second film 2 protrudes from the second table portion 32 and the end 2c is placed on the upper end of the pressing member 6. Hereinafter, the protruding end of the second film 2 may be referred to as the "protruding portion". Next, the second suction device of the second suction means 42 is operated to apply a suction force to the second film 2 to draw the second film 2 toward the second table portion 32. The opposite surface 2b of the second film 2 is adsorbed to the surface 32a of the second table 32 by suction. By adsorbing the second film 2, it is possible to prevent the second film 2 from being displaced. The suction force for the second film 2 is not particularly limited, but can be in the same range as the suction force for the first film 1. As described later, in the bonding step, the suction for the second film 2 is stopped, and the second film 2 is bonded to the first film 1. In the second preparation step, depending on the level of the suction force for the second film 2, even after the suction for the second film 2 is stopped, the second film 2 may be weakly adsorbed to the surface of the second table 32 due to residual pressure for a while. The residual pressure means that the inside of the second cavity 424 does not immediately become normal pressure after the suction is stopped, and a slightly negative pressure state remains. In order to immediately eliminate such residual pressure, the suction force for the second film 2 is set to 30,000 N / m 2 More than 80000N / m 2 It is preferable that: As the second film 2, for example, a surface protection film having a pressure-sensitive adhesive layer laminated on the bonding surface can be used.

[0035] {Laminating process 1 - First table moving process} The step of moving first table 31 is a step of bringing the bonding surface of first film 1 adsorbed to first table 31 and the bonding surface of second film 2 adsorbed to second table 32 face each other. By rotating the rotary shaft 56 counterclockwise in front view, the first table section 31 is moved to face the second table section 32 as shown by the dashed line in FIG. 5. The state after the movement is shown in FIG. 6. As shown in FIG. 6, the first table section 31 is moved to face the second table section 32, so that the bonding surface 1a of the first film 1 and the bonding surface 2a of the second film 2 face each other. In the illustrated example, the first table section 31 is moved above the second table section 32. Also, the first table section 31 is rotated so as to be parallel to the slide surface of the pressing member 6. In this embodiment in which the pressing member 6 slides on the surface of the base table 8 via the stage section 71, the surface of the base table 8 corresponds to the slide surface. Since the surface of the base stand 8 is horizontal, by rotating the first table portion 31 until it is horizontal, the bonding surface 1a of the first film 1 and the bonding surface 2a of the second film 2 face each other and the surface 31a of the first table portion 31 becomes parallel to the sliding surface of the pressing member 6. Note that the surface 32a of the second table portion 32 is an inclined surface that gradually descends from the side where the pressing member 6 is provided toward the opposite side, so the surface 31a of the first table portion 31 and the surface 32a of the second table portion 32 are not parallel to each other. Furthermore, after first table portion 31 is moved, first film 1 and second film 2 are faced to each other with gap S so that their bonding surfaces do not come into contact with each other. Surface 32a of second table portion 32 is an inclined surface that gradually descends from the side where pressing member 6 is provided to the opposite side, so that gap S is smallest on the side where pressing member 6 is provided and gradually increases away from pressing member 6.

[0036] {Lamination process 2 - Pressing member raising process} The process of raising the pressing member 6 is a process in which the bonding surface of the first film 1 adsorbed to the first table portion 31 is brought face to face with the bonding surface of the second film 2 placed on the second table portion 32, and then the pressing member 6 is raised to join the end (protruding portion) of the second film 2 and the end of the first film 1. As shown in Fig. 6, the opposite surface of end 2c (protruding portion) of second film 2 abuts against the upper end of pressing member 6. As shown in Fig. 7, when pressing member 6 is raised, the bonding surface of end 2c of second film 2 comes into contact with the bonding surface of end 1c of first film 1. End 2c (protruding portion) of second film 2 and end 1c of first film 1 are pressed and bonded between pressing member 6 and first table 31.

[0037] {Laminating process 3 - Pressing member moving process} The step of moving the pressing member 6 is a step of bonding the first film 1 and the second film 2 together by moving the pressing member 6. After the end 2c (protruding portion) of the second film 2 and the end 1c of the first film 1 are bonded together by raising the pressing member 6, the pressing member 6 is moved together with the second table 32 along the opposite surface 2b of the second film 2. When the pressing member 6 and the second table 32 are moved, the second film 2 is not attracted to the second table 32. Specifically, the suction by the second suction means 42 is released immediately before the pressing member 6 (and second table portion 32) is moved or simultaneously with the movement of the pressing member 6 (and second table portion 32). The period immediately before the pressing member 6 (and second table portion 32) is moved includes the period from when the bonding surface 1a of the first film 1 and the bonding surface 2a of the second film 2 are brought into contact with each other until the pressing member 6 (and second table portion 32) is moved, and is preferably the period from when the pressing member 6 is raised until the pressing member 6 (and second table portion 32) is slid and moved. By releasing the suction, the second film 2 is in contact with the surface 32a of the second table portion 32 but is no longer in close contact. In this specification, "close contact" refers to a state of strong contact.

[0038] Immediately before or simultaneously with the movement of the pressing member 6 (and the second table portion 32), the pressing member 6 is slid together with the second table portion 32 by the sliding means 7 without adhering the second film 2 to the surface 32a of the second table portion 32. When the pressing member 6 and the second table portion 32 are slid, as shown in FIG. 8, the pressing member 6 rolls while contacting the opposite surface 2b of the second film 2, and the surface 32a of the second table portion 32 moves while contacting the opposite surface 2b of the second film 2. As the pressing member 6 slides, the bonding surface 1a of the first film 1 and the bonding surface 2a of the second film 2 are sequentially bonded from the ends 1c, 2c toward the opposite side (the right side of the paper in FIG. 7). When the pressing member 6 reaches the end opposite to the ends 1c, 2c of the first film 1 and the second film 2, a laminated film in which the first film 1 and the second film 2 are bonded together is obtained. Thereafter, the pressing member 6 is lowered, the pressing member 6 and the second table portion 32 are slid to the home position, and the first table portion 31 is further moved to the home position. The laminated film can be easily removed from the first table portion 31 by releasing the suction of the first suction means 41. After each portion of the device A is returned to the home position, the next first film 1 and second film 2 are set and bonded in the same manner, and by repeating this process, a plurality of laminated films can be obtained in sequence.

[0039] In the conventional method (the method of Patent Document 1), when the pressing member 17 is moved together with the holding body 23, the sheet material S is adsorbed to the surface of the holding body 23. Therefore, the sheet material S adheres closely to the surface of the holding body 23, and there is a risk that the sheet material S rubs against the surface of the holding body 23 and scratches are generated while the pressing member 17 and the holding body 23 are being moved. Please note that in this paragraph, the terminology and symbols of Patent Document 1 are used by reference.

[0040] In this regard, in the present embodiment, when the pressing member 6 (and the second table portion 32) is slid, the second film 2 is not adsorbed to the surface 32a of the second table portion 32. This makes it possible to prevent the occurrence of scratches caused by the opposite surface 2b of the second film 2 rubbing strongly against the surface 32a of the second table portion 32. In particular, since the surface of the second table portion 32 has a predetermined surface roughness Ra, it is possible to effectively prevent the occurrence of scratches on the opposite surface 2b of the second film 2 that contacts the surface 32a of the second table portion 32 due to unevenness of the surface 32a.

[0041] Another embodiment will be described below. In the description, the configuration and effects that are different from those of the first embodiment described above will be mainly described. For similar configurations, the terms or symbols may be used as they are, and the description of the configuration may be omitted.

[0042] [Second embodiment] One preferred aspect of the second embodiment is that in the bonding process, air is blown from the second table toward the opposite side of the second film immediately before or simultaneously with the movement of the pressing member (without adsorbing the second film to the surface of the second table).

[0043] <Laminated film manufacturing equipment> The manufacturing apparatus A of the second embodiment is similar to the manufacturing apparatus A shown in FIGS. 1 to 4 and described in the section <Laminated Film Manufacturing Apparatus A> of the first embodiment above, except for the following points. The manufacturing apparatus A of the second embodiment is provided with air blowing means 9 that blows air from the second table portion 32 toward the opposite surface of the second film 2. The air blowing means 9 has a second hollow portion 424, a second air vent 425, and an air injector (not shown) such as a compressor that introduces air into the second hollow portion 424. In this embodiment, the second hollow portion 424 and the second air vent 425 serve as both the second suction means 42 and the air blowing means 9. As shown in Fig. 9, by sealing air in second cavity 424 with the air injector, positive pressure is created inside second cavity 424 and air is ejected from second air hole 425. This causes the air to be blown onto the opposite surface 2b of second film 2 placed on the surface of second table portion 32. In Fig. 9, the direction of the air ejected from second air hole 425 is indicated by a hollow arrow. In Fig. 9, only second table portion 32 is shown in cross section. In this embodiment, the surface roughness Ra of the second table portion 32 may be a predetermined value, or the surface roughness Ra of the second table portion 32 may exceed 3.5 μm.

[0044] <Laminated Film Manufacturing Method and Operation of Manufacturing Apparatus> The manufacturing method of the second embodiment is the same as the {first preparation step}, {second preparation step}, {bonding step 1--step of moving the first table part} and {bonding step 2--step of raising the pressing member} in <Manufacturing method of laminated film and operation of the manufacturing apparatus> of the first embodiment above, except for the step of moving the pressing member. That is, as described in the first embodiment, the {first preparation step}, {second preparation step}, {lamination step 1-step of moving the first table}, and {lamination step-step of raising the pressing member 6} are performed. As a result, the ends 1c and 2c of the first film 1 and the second film 2 are joined.

[0045] {Laminating process 3 - Pressing member moving process} The pressing member 6 is moved along the opposite surface 2b of the second film 2 together with the second table portion 32. When the pressing member 6 and the second table portion 32 are moved, the suction of the second film 2 by the second suction means 42 is released so that the second film 2 is not suctioned to the second table portion 32. Furthermore, immediately before or simultaneously with the movement of the pressing member 6 (and second table portion 32), air is blown from the second table portion 32 by the air blowing means 9 toward the opposite surface 2b of the second film 2. "Immediately before" the pressing member 6 (and second table portion 32) is moved refers to the period from when the bonding surfaces of the first film 1 and the second film 2 are brought together until the pressing member 6 (and second table portion 32) is moved, and preferably refers to the period from when the pressing member 6 is raised until the pressing member 6 (and second table portion 32) is moved.

[0046] By ejecting air from the second air vent 425 and blowing the air against the opposite surface 2b of the second film 2, as shown in Figure 9, the second film 2 is lifted off the surface 32a of the second table portion 32, or the opposite surface 2b of the second film 2 is slightly or partially in contact with the surface 32a of the second table portion 32. The blowing pressure of the air from the second table 32 may be such that the second film 2 floats from the surface of the second table 32 and the bonding surface 2a of the second film 2 (excluding the protruding portion) does not contact the bonding surface 1a of the first film 1. For example, the blowing pressure of the air is 0.005 MPa or more and 0.5 MPa or less, preferably 0.008 MPa or more and 0.3 MPa or less, and more preferably 0.01 MPa or more and 0.1 MPa or less. By setting the blowing pressure within the above range, the second film 2 floats from the second table 32 or slightly contacts the second table 32. Then, the pressing member 6 is slid together with the second table 32 by the sliding means 7. When the pressing member 6 and the second table 32 are slid, the bonding surface 1a of the first film 1 and the bonding surface 2a of the second film 2 are sequentially bonded from the ends 1c, 2c toward the opposite side (the right side of the paper in FIG. 7). When the pressing member 6 reaches the ends of the first film 1 and the second film 2 opposite to the ends 1c, 2c, a laminated film in which the first film 1 and the second film 2 are bonded together is obtained.

[0047] In this embodiment, when the pressing member 6 (and the second table portion 32) is moved, the opposite surface 2b of the second film 2 does not contact, or only slightly or partially contacts, the surface 32a of the second table portion 32, thereby effectively preventing scratches on the second film 2 caused by unevenness on the surface 32a of the second table portion 32.

[0048] [Third embodiment] In the {Laminating step 1-first table moving step} of the first and second embodiments, when the first table 31 is moved to face the second table 32, the surface of the first table 31 and the surface of the second table 32 are not parallel, but this is not limited thereto. For example, as shown in FIG. 10, when the first table 31 faces the second table 32, the surface 31a of the first table 31 and the surface 32a of the second table 32 may be configured to be parallel. In other words, the first table 31 may be made to face the second table 32 so that the bonding surface 1a of the first film 1 and the bonding surface 2a of the second film 2 are parallel with a gap S (in this case, the gap S is constant). Such a manufacturing apparatus A can be configured, for example, by attaching the second table 32 parallel to the stage 71. In this manner, after the surface 31a of the first table portion 31 is aligned parallel to the surface 32a of the second table portion 32, the pressing member 6 is raised to join the end portion 2c of the second film 2 and the end portion 1c of the first film 1, and the pressing member 6 and the second table portion 32 are slid to produce a laminated film.

[0049] [Fourth embodiment] In the {Laminating step 1-step of moving the first table} of the first and second embodiments, when the first table 31 is moved toward the second table 32, a gap S is formed between the end 2c of the second film 2 and the end 1c of the first film 1, but this is not limiting. For example, as shown in FIG. 11, when the first table 31 is moved toward the second table 32, the end 2c of the second film 2 and the end 1c of the first film 1 may come into contact with each other. In this case, only the end 2c of the second film 2 and the end 1c of the first film 1 are joined together as soon as the rotational movement of the second table 32 is completed, and therefore there is no need to perform the {Laminating step 2-step of raising the pressing member}.

[0050] [Fifth embodiment] In the first and second embodiments, the first film 1 and the second film 2 are bonded together with the stage 71 held horizontally, but the present invention is not limited thereto. For example, the first film 1 and the second film 2 may be bonded together with the base table 8 of the manufacturing device A tilted relative to the horizontal plane. For example, as shown in FIG. 12, the base table 8 of the manufacturing device A may be placed on the horizontal plane B1 of the work table B, and a tilting mechanism C may be provided to tilt the manufacturing device A relative to the work table B. The tilting mechanism C may include, for example, a hinge portion C1 that connects the base table 8 of the manufacturing device A to the work table B, and a drive portion (not shown) that rotates the manufacturing device A around the axis of the hinge portion C1. By operating the drive portion (not shown), the manufacturing device A can be tilted so that the base table 8 of the manufacturing device A is at an acute angle or approximately a right angle relative to the horizontal plane B1 of the work table B. The state in which the device A is tilted at an acute angle relative to the horizontal plane B1 is shown by a dashed line. In the illustrated example, the manufacturing apparatus A is tilted in the width direction, but the tilting direction is not limited to this. After tilting the manufacturing apparatus A in any direction relative to the horizontal plane in this manner, the above-mentioned <Laminated film manufacturing method and operation of the manufacturing apparatus A> may be performed. Although not illustrated, the above-mentioned <Laminated film manufacturing method and operation of the manufacturing apparatus A> may be performed with the apparatus A at a substantially right angle relative to the horizontal plane B1.

[0051] [Sixth embodiment] In each of the above embodiments, the second table portion 32 may be subjected to an antistatic treatment in order to prevent the second film 2 from adhering to the surface of the second table portion 32 due to static electricity. By performing the antistatic treatment, it is possible to prevent the second film 2 from rubbing strongly against the surface of the second table portion 32 in the process of sliding the pressing member 6 and the second table portion 32. Also, in the second embodiment in which air is blown against the second film 2 in the process of sliding the pressing member 6 and the second table portion 32, as in the second embodiment, it is also possible to satisfactorily lift the second film 2 from the surface of the second table portion 32. Examples of antistatic treatment include (a) forming the second table portion 32 from a material containing an antistatic agent, (b) providing the second table portion 32 with a smoothing finishing material 329 containing an antistatic agent, and (c) forming the second table portion 32 from a material that is difficult to become charged with electricity. The first table portion 31 may also be subjected to antistatic treatment. EXAMPLES

[0052] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0053] [Film used] First film A polarizing plate (product name "NOB20EFJSP-SA01" by Nitto Denko Corporation) having a length of 400 mm, a width of 240 mm and a thickness of 52 μm. The polarizing plate includes a polarizing film. Second film A surface protection film (product name "E-MASK RP209M" by Nitto Denko Corporation) measuring 400 mm in length, 240 mm in width, and 58 μm in thickness. A 20 μm-thick adhesive layer is laminated on the bonding surface of this surface protection film, and a release liner is further laminated to conceal the adhesive surface of this adhesive layer.

[0054] [Example 1] A manufacturing apparatus A as shown in Figs. 1 to 4 was prepared. The first table portion 31 and the second table portion 32 of this apparatus were formed of a non-electrostatic resin (trade name "UNILATE" manufactured by Unitika Ltd.). A polyethylene terephthalate-based resin film was laminated on the second table portion 32 as a smoothing material 329. The surface of this resin film constituted the surface 32a of the second table portion 32, and the surface roughness Ra was 1.22 μm. The surface roughness Ra was the arithmetic mean roughness Ra defined in JIS B 0601:2013, and was measured using a surface roughness meter (trade name "SJ-400" manufactured by MITUTOYO Co., Ltd.). The measurement was performed at three arbitrary points, and the average value was adopted as the surface roughness Ra.

[0055] The polarizing plate (first film) was set on the first table. The suction force on the polarizing plate was 75000N / m 2 The first suction means was operated so that the opposite surface of the polarizing plate was suctioned to the first table section. A surface protective film (second film) was set on the second table section. The suction force for the surface protective film was 75000 N / m 2 The second suction means set to the position 1 was operated to suction the opposite surface of the surface protection film to the second table section. Then, the release liner of the surface protection film was peeled off to expose the adhesive surface of the adhesive layer laminated on the surface protection film. The first table section was rotated to face the bonding surface of the polarizing plate (first film) and the adhesive surface of the bonding surface of the surface protection film (second film) (see FIG. 6). Next, the pressing member was raised to bond the end of the polarizing plate and the end of the surface protection film (see FIG. 7). After the pressing member was raised, the suction of the second suction means was stopped, the suction of the second table section to the second film was released, and the pressing member and the second table section were slid to produce a laminated film consisting of the polarizing plate / adhesive layer / surface protection film. After the first table section was returned to the home position, the suction of the first suction means was stopped to remove the laminated film from the device. The condition of the surface of the surface protection film of the obtained laminated film (the surface opposite to the pressure-sensitive adhesive layer) was observed. Specifically, the light of a searchlight was applied to the entire surface of the surface protection film, and the condition of the entire surface was observed by staring at it with the naked eye. The results are shown in Table 1. In the scratch evaluation column in Table 1, "A" indicates that no scratches were found, "B" indicates that 1 to 10 scratches were found, "C" indicates that 11 to 20 scratches were found, and "D" indicates that 21 or more scratches were found. The scratches were fine streaky scratches parallel to the sliding direction of the pressing member.

[0056] [Example 2] A manufacturing apparatus was prepared that did not laminate a polyethylene terephthalate-based resin film. The manufacturing apparatus of Example 2 was the same as that of Example 1, except that the surface of the second table part was made of a non-static resin. The surface roughness Ra of the second table part of Example 2 was 2.11 μm. A laminated film of Example 2 was produced in the same manner as in Example 1, except that this device was used and the following changes were made. Modifications: After the pressing member was raised, the suction of the second suction means was stopped and the air injector was operated to send air into the second hollow portion and to blow air out of the second air hole at a blowing pressure of 0.01 MPa. In this state, the pressing member and the second table portion were slid. The surface condition of the surface protection film of the obtained laminated film was observed in the same manner as in Example 1. The results are shown in Table 1.

[0057] [Example 3] A manufacturing apparatus was prepared in which a porous film (trade name "Sunmap" manufactured by Nitto Denko Corporation) was laminated on the surface of the second table instead of the polyethylene terephthalate resin film. The manufacturing apparatus of Example 3 was the same as that of Example 1, except that the surface of the porous film constituted the surface of the second table. The surface roughness Ra of the second table of Example 3 (surface roughness Ra of the porous film) was 3.28 μm. Except for using this device, the laminated film of Example 3 was produced in the same manner as in Example 1. The surface condition of the surface protection film of the obtained laminated film was observed in the same manner as in Example 1. The results are shown in Table 1.

[0058] [Example 4] A manufacturing apparatus that does not laminate a polyethylene terephthalate-based resin film was prepared. The manufacturing apparatus of Example 4 is similar to that of Example 1, except that the surface of the second table portion 32 is made of a non-static resin. Except for using this device, the laminated film of Example 4 was produced in the same manner as in Example 1. The surface condition of the surface protection film of the obtained laminated film was observed in the same manner as in Example 1. The results are shown in Table 1.

[0059] [Example 5] A laminated film of Example 5 was produced in the same manner as in Example 2, except that the blowing pressure of the air blown from the second air hole was changed to 0.1 MPa. The surface condition of the surface protection film of the obtained laminated film was observed in the same manner. The results are shown in Table 1.

[0060] [Example 6] A laminated film of Example 6 was produced in the same manner as in Example 2, except that the blowing pressure of the air blown from the second vent hole was changed to 0.5 MPa. The surface condition of the surface protection film of the obtained laminated film was observed in the same manner. The results are shown in Table 1.

[0061] [Comparative Example 1] A manufacturing apparatus that does not laminate a polyethylene terephthalate-based resin film was prepared. The manufacturing apparatus A of Comparative Example 1 is similar to the manufacturing apparatus of Example 1, except that the surface of the second table part is made of a non-static resin. Except for using this device and for not releasing the suction by the second suction means and for sliding the pressing member and the second table in a state in which the surface protective film was suctioned to the second table, the laminate film of Comparative Example 1 was produced in the same manner as in Example 1. The surface condition of the surface protective film of the obtained laminate film was observed in the same manner as in Example 1. The results are shown in Table 1.

[0062] [Table 1]

[0063] [evaluation] The laminated film of Comparative Example 1 had many scratches on the surface of the film, as compared with Examples 1 to 6. Comparing Examples 1, 3 and 4, it can be seen that the smaller the surface roughness Ra of the second table portion, the more effectively scratches can be prevented, and that in particular, when the surface roughness Ra is 1.5 μm or less (for example, 1.22 μm in Example 1), scratches are effectively prevented. Furthermore, comparing Examples 2, 5, and 6, it is found that the smaller the air blowing pressure against the surface protection film (second film), the more the occurrence of scratches can be prevented, and that it is particularly effective in preventing scratches when the blowing pressure is 0.3 MPa or less (e.g., 0.1 MPa in Example 5). Note that when the blowing pressure is relatively high, as in Example 6, the surface protection film (second film) tends to flutter, which is presumably what influenced the occurrence of scratches. [Explanation of symbols]

[0064] A Manufacturing equipment 1. First Film 1a: Bonding surface of first film 1b Opposite side of first film 2. Second Film 2a: Second film bonding surface 2b Opposite side of second film 31 First table section 32 Second table section 41 First adsorption means 42 Second adsorption means 5. Transportation 6 Pressing member 7 Slide means 8 Base

Claims

1. A method for producing a laminated film by laminating a first film and a second film together, comprising the steps of: a first preparation step of placing a surface of the first film opposite to a bonding surface on a first table and adsorbing the opposite surface of the first film to a surface of the first table by an adsorption means; a second preparation step of placing a surface of the second film opposite to the bonding surface on a surface of a second table; a bonding process of bonding the first film and the second film together by bringing a bonding surface of the first film adsorbed on the first table section and a bonding surface of the second film placed on the second table section into contact with each other, applying a pressing member to the opposite surface of the second film, and moving the pressing member together with the second table section along the opposite surface of the second film, In the laminating step, the pressing member is moved without adsorbing the second film to the surface of the second table portion.

2. The method for producing a laminated film according to claim 1 , wherein the surface roughness Ra of the area of ​​the surface of the second table portion on which the second film is placed is 3.5 μm or less.

3. 2. The method for producing a laminated film according to claim 1, wherein in the bonding step, air is blown from the second table toward the opposite surface of the second film immediately before or simultaneously with the movement of the pressing member.

4. In the second preparation step, the opposite surface of the second film is attached to the second table by an adsorption means; The method for producing a laminated film according to claim 1 , wherein in the bonding step, adsorption of the second film is released immediately before or simultaneously with the movement of the pressing member.

5. the adsorption means applies a suction force to the second film so as to attract the second film toward the second table portion, The suction force is 30000 N / m ２ More than 80000N / m ２ The method for producing a laminated film according to claim 4, wherein:

6. The method for producing a laminated film according to claim 3 , wherein the air blowing pressure is from 0.005 MPa to 0.5 MPa.

7. The method for producing a laminated film according to claim 1 , wherein at least one of the first film and the second film includes a polarizing film.

8. A laminated film manufacturing apparatus for manufacturing a laminated film by bonding a first film and a second film, comprising: a first table portion on which the first film is placed; a suction means provided on the first table portion and adapted to suction a surface of the first film opposite to a bonding surface; a second table portion on which the second film is placed; a moving means for moving the first table portion, which has adsorbed the first film, to face the second table portion so that a bonding surface of the first film and a bonding surface of the second film face each other; a pressing member that presses a surface of the second film opposite to the bonding surface; a slide means for moving the pressing member together with the second table portion along the opposite surface of the second film, a surface roughness Ra of the area of ​​the surface of the second table portion on which the second film is placed is 3.5 μm or less.

9. A laminated film manufacturing apparatus for manufacturing a laminated film by bonding a first film and a second film, comprising: a first table portion on which the first film is placed; a suction means provided on the first table portion and adapted to suction a surface of the first film opposite to a bonding surface; a second table portion on which the second film is placed; a moving means for moving the first table portion, to which the first film has been adsorbed, to face the second table portion so that a bonding surface of the first film and a bonding surface of the second film face each other; a pressing member that presses a surface of the second film opposite to the bonding surface; a slide means for moving the pressing member together with the second table portion along the opposite surface of the second film, an air blowing means for blowing air from the second table portion toward the opposite surface of the second film immediately before or simultaneously with the movement of the pressing member;

10. The laminated film manufacturing apparatus according to claim 9 , wherein the air blowing pressure is 0.005 MPa or more and 0.5 MPa or less.

Images