CN112170909A

CN112170909A - Method for processing end face of laminate and method for producing end-face processed film

Info

Publication number: CN112170909A
Application number: CN202010638132.2A
Authority: CN
Inventors: 藤井干士; 高桥政仁; 铃木到
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 2019-07-05
Filing date: 2020-07-03
Publication date: 2021-01-05
Also published as: TW202128381A; KR20210004864A; JP6704081B1; JP2021011008A; JP2021011009A; JP7213834B2

Abstract

The invention relates to a method for processing an end face EF of a laminate (10), which has a multilayer film (12). The method comprises: a step of pressing the laminate (10) by a first jig (20) having a first contact member (21) and a second jig (30) having a second contact member (31) so that the first contact member (21) and the second contact member (31) contact the laminate (10) from both sides in the thickness direction of the laminate (10) to fix the laminate (10); and a step of processing the end face EF of the fixed laminate (10). In the pressing step, Pmax and Pmin are respectively set as the maximum value and the minimum value of the pressure of the contact surface A of the first contact member (21) which is in contact with the laminated body (10), and Pmin is not less than 0.4 Pmax.

Description

Method for processing end face of laminate and method for producing end-face processed film

Technical Field

The present invention relates to a method for processing an end face of a laminate, a method for producing an end-face processed film, and an end-face processing apparatus.

Background

Conventionally, a method has been known in which an end face of a laminate having a multilayer film is processed by grinding or the like in a state where the laminate is fixed by pressing the laminate in a thickness direction with a pair of jigs (for example, japanese patent application laid-open No. 2004-167672).

However, even with the conventional method, a laminate having a multilayer film cannot be sufficiently fixed, and the processing accuracy of each film may be reduced.

Disclosure of Invention

The present invention has been made in view of the above problems, and relates to a method for processing an end face of a laminate, which can achieve high processing accuracy.

The method of the present invention is a method of processing an end face of a laminate having a multilayer film,

the method for processing the end face of the laminated body comprises the following steps:

a step of pressing the laminate by a first contact member and a second contact member so that the first contact member and the second contact member contact the laminate from both sides in the thickness direction of the laminate, thereby fixing the laminate; and

a step of processing the end face of the fixed laminate,

in the pressing step, when the maximum value and the minimum value of the pressure of the contact surface a of the first contact member that is in contact with the laminate are Pmax and Pmin, respectively,

the Pmin is more than or equal to 0.4 Pmax.

Here, the laminate may have a shape having a longitudinal direction (X direction) when viewed from the thickness direction,

the first contact member may have one end portion and the other end portion that are in contact with one end portion and the other end portion of the stacked body in the longitudinal direction,

in the pressing step, the one end portion and the other end portion of the first contact member may be relatively pressed toward the second contact member.

In the pressing step, the first contact member may be pressed toward the second contact member by a first jig that is in contact with the one end portion and the other end portion of the first contact member and that is not in contact with a central portion between the one end portion and the other end portion of the first contact member.

Further, the first jig may be a metal member.

Further, 75% or more of the entire end faces of the laminate may be processed.

Further, the first contact member may be a metal member.

The second contact member may have one end portion and the other end portion that are in contact with one end portion and the other end portion of the stacked body in the longitudinal direction, respectively.

In addition, a contact surface a of the first contact member that contacts the stacked body may have an annular shape.

The width of the ring of the contact surface A may be 5 to 25 mm.

In addition, a contact surface a of the first contact member that contacts the stacked body may have a rectangular ring shape or an elliptical ring shape.

Before the step of processing, the outer end of the fixed laminate may protrude outward by 0.8 to 1.5mm from the outer end of the contact surface a of the first contact member, which is in contact with the laminate, when viewed in the thickness direction of the laminate.

In addition, a contact surface E of the second contact member, which is in contact with the stacked body, may have an annular shape.

The machining step may include a step of bringing a side surface of an end mill that rotates about an axis parallel to a thickness direction of the stacked body into contact with the end surface of the stacked body.

In addition, the thickness of the first contact member may be 2 to 15 mm.

Further, at least one layer of the multilayer film may be a resin film.

The method for producing an end-face-processed film of the present invention comprises: a step of laminating the multilayer film to obtain a laminate; and a step of processing an end face of the laminate, wherein the end face of the laminate is processed by the above-described method.

An end surface processing apparatus according to the present invention processes an end surface of a laminated body having a multilayer film, the end surface processing apparatus including:

a first contact member having a contact surface A that contacts one surface of the laminate;

a first clamp connected with the first contact member;

a second contact member having a contact surface E that contacts the other surface of the laminate;

a second clamp connected with the second contact member;

a pressing portion that presses at least one of the first jig and the second jig toward the other to fix the laminated body between the first contact member and the second contact member; and

a processing unit that processes an end face of the laminated body fixed between the first contact member and the second contact member,

the first contact member has a shape having a longitudinal direction when viewed from a pressing direction,

the first clamp has a shape that is in contact with one end portion and the other end portion of the first contact member in the longitudinal direction and is not in contact with a central portion between the one end portion and the other end portion of the first contact member.

Here, a contact surface of the first contact member, which is in contact with the stacked body, may have an annular shape.

Further, the second contact member may have a shape having a longitudinal direction when viewed from a pressing direction,

the longitudinal direction of the first contact member is parallel to the longitudinal direction of the second contact member.

According to the present invention, a method for processing an end face of a laminate, which can achieve high processing accuracy, and the like are provided.

Drawings

Fig. 1 is a schematic side view of an end surface processing apparatus 100 according to an embodiment of the present invention.

Fig. 2 (a) is a top perspective view of the first clamp 20 and the first contact member 21 in fig. 1, and fig. 2 (b) is a bottom perspective view of the first clamp 20 and the first contact member 21 in fig. 1.

Fig. 3 is a top exploded perspective view of the first holder 20 and the first contact member 21 in fig. 2 (a).

Fig. 4 is a bottom exploded perspective view of the first clamp 20 and the first contact member 21 of fig. 2 (b).

Fig. 5 is a view in section V-V of fig. 1.

Fig. 6 (a) is a top perspective view of the second jig 30 and the second contact member 31 in fig. 1, and fig. 6 (b) is a bottom exploded perspective view of the second jig 30 and the second contact member 31 in fig. 1.

Fig. 7 is an enlarged view of the laminate 10 in fig. 1.

Fig. 8 is a bottom exploded perspective view of the first clamp 20 and the first contact member 21 according to another embodiment.

Fig. 9 is a schematic side view of an end surface processing apparatus 100 according to another embodiment of the present invention.

Fig. 10 is a schematic side view of an end surface processing apparatus according to another embodiment of the present invention.

Fig. 11 is a bottom exploded perspective view of the first jig 20 and the first contact member 21 used in comparative example 2.

Description of the reference numerals

10 … laminate, EF … end face (side face), AP … outer end, 12 … film, 20 … first clamp, 21 … first contact member, 23 … tip member, 30 … second clamp, 31 … second contact member, 40 … processing section, 60 … pressing section, 61 … fixing section, 100 … end face processing device, A, E … contact face, 21A, 10A, 31A … end section, 21B, 10B, 31B … central section, 31C, 10C, 31C … other end section.

Detailed Description

An embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a side view of an end surface processing apparatus 100 according to an embodiment of the present invention.

The end surface processing apparatus 100 of the present embodiment mainly includes a first contact member 21, a first jig 20, a second contact member 31, a second jig 30, a fixing portion 61, a pressing portion 60, and a processing portion 40.

As shown in fig. 1, the first contact member 21 and the second contact member 31 are arranged so as to sandwich the laminate 10 of films from both sides in the thickness direction. In the figure, the X, Y direction is the horizontal direction, and the Z direction is the vertical direction.

The first contact member 21 is disposed above the second contact member 31. A first clamp 20 is disposed above the first contact member 21 and a second clamp 30 is disposed below the second contact member 31.

As shown in fig. 2 (a) and (b) and fig. 3 and 4, the first contact member 21 is a rectangular plate-like member, and the thickness direction is arranged along the Z direction (pressing direction), and is arranged such that the length direction is parallel to the X direction when viewed from the Z direction.

As shown in fig. 2 and 4, the first contact member 21 has a flat contact surface a that is in contact with the film laminate 10 on the lower surface side facing the second contact member 31, and has a flat contact surface B on the upper surface side opposite to the contact surface a.

The size of the rectangle of the first contact member 21 can be set as appropriate within a range smaller than the outer shape of the surface (the surface perpendicular to the thickness direction) of the laminate 10 of the fixed film.

Fig. 5 is a sectional view taken along line V-V of fig. 1. The first contact member 21 is preferably sized such that, when the contact surface a of the first contact member 21 is brought into contact with the surface of the laminate 10 of pre-processed films in the thickness direction, the end face (outer end) EF of the laminate 10 of films protrudes outward by 0.8mm to 1.5mm from the outer end AP of the contact surface a of the first contact member 21 in contact with the laminate 10, as viewed in the thickness direction of the laminate 10 of films. Here, the protruding amount of the stacked body from the outer end AP of the contact surface a as viewed in the thickness direction is referred to as T. For example, the protrusion amount T before processing may be 1 mm. The protrusion T of the processed laminate may be 0.3 to 0.8mm, and may be 0.5 mm.

The rectangular aspect ratio of the first contact member 21 is preferably set to be approximately the same as the aspect ratio of the surface (the surface perpendicular to the thickness direction) of the laminate 10 (the film 12) to be pressed (for example, 90 to 110%). Typically, the thickness may be, for example, 1.01 to 3.00, preferably 1.40 to 2.50, and more preferably 1.70 to 2.20, depending on the shape of the processed product.

In the present embodiment, the first contact member 21 has a rectangular recess P in the center of the lower surface, and the contact surface a has a rectangular ring shape. In the present specification, a rectangular ring shape means a ring shape constituted by a rectangular outline. In the present embodiment, the center portion of the contact surface a is not in contact with the stacked body 10 due to the concave portion P, but the center portion of the contact surface a may be not in contact with the through hole.

The width S of the ring of the contact surface A of the first contact member 21 may be 5 to 25mm, preferably 10mm or more, and more preferably 15mm or less.

The thickness G of the first contact member 21 shown in fig. 4 may be appropriately set within a range in which the first contact member 21 is not flexed. The thickness is preferably 2 to 15mm, more preferably 3mm or more, further preferably 13mm or less, and may be 7 mm.

The first contact member 21 is preferably a metal member. Examples of metals are aluminum, steel, stainless steel, alloy tool steel (e.g., SKD11), and the like.

The first jig 20 includes a distal end member 23 and a coupling portion 25. As shown in fig. 3 and 4, the tip member 23 has a pair of flat surfaces C that contact the surface B of the first contact member 21, and a flat surface D on the opposite side of the surface C. Specifically, the center portion M between the pair of surfaces C of the tip member 23 is a concave portion, and the both end portions N including the surfaces C are convex portions with respect to the center portion M.

As shown in fig. 4, the pair of surfaces C of the tip member 23 are arranged apart in the longitudinal direction (X-axis direction, hereinafter sometimes simply referred to as the longitudinal direction) of the rectangle of the first contact member 21, and extend in the short-side direction (Y-direction, hereinafter sometimes simply referred to as the short-side direction) of the rectangle of the first contact member 21.

As shown in fig. 2 and 3, the pair of surfaces C of the tip member 23 contact a part of one end portion 21A and a part of the other end portion 21C in the longitudinal direction (X-axis direction) of the surface B of the first contact member 21, but do not contact the central portion 21B in the longitudinal direction. Here, the one end portion 21A refers to a region from one end of the first contact member 21 in the longitudinal direction (X-axis direction) to 25% of the length of the long side, the other end portion 21C refers to a region from the other end in the longitudinal direction to 25% of the length of the long side, and the central portion 21B refers to a region remaining after the one end portion 21A and the other end portion 21C are removed from the first contact member 21.

The first surface C may be in contact with at least a part of the one end portion 21A without contacting the central portion 21B. The other surface C may be in contact with at least a part of the other end portion 21C without contacting the central portion 21B.

Preferably, each surface C covers 30% or more of the one end portion 21A or the other end portion 21C. The width W in the longitudinal direction of the surface C in FIG. 4 may be, for example, 10mm to 30mm, preferably 15mm to 25 mm.

The surface C is in contact with the one end portion 21A and the other end portion 21C over a length range of preferably 60% or more, and more preferably 80% or more, of the entire length of the short side (Y axis).

The material of the front end member 23 may be the same as that of the first contact member 21.

The thickness of the front end member 23 can be set as appropriate within a range in which no deflection occurs. The thickness (Z direction) of the both ends N may be, for example, 3mm to 20mm, preferably 3mm to 15 mm. The thickness (Z direction) of the central portion M may be, for example, 2mm to 19mm, preferably 2mm to 12 mm.

The connecting portion 25 is a member fixed to the surface D of the distal end member 23 and fixed to a pressing portion 60 described later. As shown in fig. 2, the coupling portion 25 is in contact with a portion Q including the center (center of gravity) of the surface D. The portion Q of the surface D enters a region formed by projecting the central portion 21B of the surface B of the first contact member 21 in the Z-axis direction, but does not enter a region formed by projecting the one end portion 21A and the other end portion 21C in the Z-axis direction. The center axis of the coupling portion 25 of the first jig 20 and the center axis of the second jig 30 described later are arranged on the same line.

The front end member 23 and the coupling portion 25 are fixed to each other to constitute the first jig 20. The front end member 23 and the first contact member 21 are fixed to each other. As a method for fixing them, a known method such as welding or screwing may be employed.

(second contact member 31 and second holder 30)

As shown in fig. 1, the second contact member 31 is disposed on the lower side than the first contact member 21. As shown in fig. 1 and (a) and (b) of fig. 6, the second jig 30 is disposed below the second contact member 31.

The second contact member 31 is a rectangular plate-like member similar to the first contact member 21. The second contact member 31 has a flat contact surface E that is in contact with the film laminate 10 on the upper surface side facing the contact surface a of the first contact member 21, and has a flat contact surface F on the surface opposite to the contact surface E. The second contact member 31 has one end 31A, a central portion 31B, and the other end 31C. The one end portion 31A, the central portion 31B, and the other end portion 31C are defined in the same manner as the first contact member 21.

The thickness direction of the second contact member 31 is arranged along the Z direction (pressing direction), and the length direction thereof is parallel to the X direction when viewed from the Z direction, and the length direction of the rectangle of the second contact member 31 is arranged parallel to the length direction of the rectangle of the first contact member 21. The size and aspect ratio of the rectangle of the second contact member 31 may be set within the same range as those of the first contact member 21, and are preferably the same as those of the first contact member 21. The shape of the contact surface E may be a rectangular ring shape having a recess P serving as a non-contact portion provided at the center thereof, as in the contact surface a of the first contact member 21, or may be a simple plane without a recess.

The second contact member 31 may be of the same material, structure and thickness as the first contact member 21.

The second jig 30 is fixed to the surface F of the second contact member 31 and to a fixing portion 61 described later. The second jig 30 is in contact with a portion R including the center (center of gravity) of the face F. The portion R of the surface F enters a region formed by projecting the central portion 31B of the surface F of the second contact member 31 in the Z-axis direction, but does not enter a region formed by projecting the one end portion 31A and the other end portion 31C in the Z-axis direction. The definition of the one end portion, the other end portion, and the central portion is the same as that of the first contact member 21. As described above, the central axis of the second jig 30 and the central axis of the coupling portion 25 (first jig 20) are arranged on the same line.

The second contact member 31 and the second jig 30 are fixed to each other by a known method such as welding or screwing, and the second jig 30 is connected to the fixing portion 61.

In fig. 1, the second contact member 31 is fixed to the fixing portion 61 via the second jig 30 with the contact surface E facing upward, the first contact member 21 is fixed to the pressing portion 60 via the first jig 20 with the contact surface a facing downward, and the contact surface E faces the contact surface a.

Pressing portion 60 is disposed above fixing portion 61, and pressing portion 60 is configured to be movable in the vertical direction with respect to fixing portion 61. Therefore, the pressing portion 60 can press the contact surface a of the first contact member 21 toward the contact surface E of the second contact member 31. That is, the laminate 10 of films can be fixed between the contact surface a of the first contact member 21 and the contact surface E of the second contact member 31 by pressing them from both sides in the thickness direction.

The specific structure of the pressing portion 60 is not particularly limited, and a known moving mechanism such as a screw jack or a hydraulic jack may be used. The device can be of a single-shaft type or a multi-shaft type.

The machining unit 40 includes an end mill 44, a rotation driving unit 42 of the end mill, and a moving unit 46 of the end mill.

The form of the counter-milling cutter 44 is not particularly limited, and for example, a Router (Router) type end mill or the like can be preferably used. The edge length (Z-axis direction) of the end mill 44 is preferably longer than the thickness of the film laminate 10.

The rotation driving portion 42 rotates the end mill 44 about its axis. In the present embodiment, the rotation driving unit 42 rotates the end mill 44 about an axis parallel to the thickness direction (Z direction) of the stacked body 10.

The end mill moving unit 46 moves the rotating end mill 44 in a direction perpendicular to the thickness direction of the stacked body 10 along the end face (side face) EF in a state where the side face of the end mill 44 contacts the end face EF of the stacked body 10.

The end surface processing apparatus 100 may have only one processing portion 40, but may have two or more processing portions 40 from the viewpoint of rapid processing.

(method of facing and method of producing a facing film)

Next, an end-face processing method and a method for producing an end-face processed film according to an embodiment of the present invention will be described.

First, a laminate 10 of the films 12 as shown in fig. 7 is prepared. Each film 12 may be a single-layer film or a laminated film.

An example of a single layer film is a resin film. Examples of the resin include a cellulose-based resin (e.g., triacetylcellulose), a polyolefin-based resin (e.g., polypropylene-based resin), a cycloolefin-based resin (e.g., norbornene-based resin), an acrylic-based resin (e.g., terephthalic acid-based resin), a polyester-based resin (e.g., polyethylene-terephthalic acid-based resin), and a polyimide-based resin (e.g., polyimide, polyamideimide). These single-layer films may be optical films such as protective films, substrate films, retardation films, and window films.

Examples of the laminate film are a polarizing plate, a circularly polarizing plate, and a touch sensor.

For example, the polarizing plate includes at least a pair of optical films and a polarizer disposed between the pair of optical films.

The circularly polarizing plate has, for example, a polarizing plate (for example, the above polarizing plate) and a phase difference (1/4 λ) film.

The laminated film may further include other layers such as an adhesive layer, a release film, and a protective film.

The thickness of each film 12 is not particularly limited, and may be, for example, 20 μm to 500mm, preferably 50 μm to 500 μm, and more preferably 50 μm to 200 μm.

The outer shape (shape viewed from the thickness direction) of the film 12 may be a shape corresponding to the outer shapes of the first contact member 21 (contact surface a) and the second contact member 31 (contact surface E). In the present embodiment, rectangular films are prepared in conformity with the outer shapes of the contact surfaces a and E.

The aspect ratio of the film is preferably 1.01 to 3.00, except 0. The length of the long side of the film may be, for example, 100mm or more.

The laminate 10 includes a plurality of such films 12. The outer shape of each membrane 12 is preferably substantially the same. For example, the multilayer film 12 having substantially the same outer shape can be obtained by cutting the film 12 from a film blank with a thomson knife or the like. In the laminated body 10, the respective films 12 are laminated in such a manner that long sides are parallel to each other and end portions overlap each other when viewed from the thickness direction.

Each of the films 12 of the laminate 10 is generally a film 12 having the same lamination structure as each other, but films 12 having different lamination structures may be laminated. The number of the films 12 in the laminate 10 is not particularly limited as long as it is 2 or more, and is usually 5 or more, may be 10 or more, and may be 50 or more.

In order to prevent the film 12 from being damaged when the laminated body 10 is fixed by the first contact member 21 and the second contact member 31, the laminated body 10 may have the protective film 14 on one or both of both ends in the laminating direction, in addition to the multilayer film 12.

An example of the protective film 14 is a resin film. Examples of the resin include polystyrene, polyethylene terephthalate, and the like, in addition to the resins exemplified in the resin film.

The thickness of the protective film 14 may be, for example, 0.2mm to 1.0mm, preferably 0.3mm to 0.8mm, and more preferably 0.3mm to 0.6 mm.

The thickness of the laminate 10 may be, for example, 10mm to 60mm, preferably 20mm to 50 mm.

The end face EF of the laminate 10 is the object of the present embodiment. The end face EF indicates the entire side face of the laminated body 10 viewed from the first contact member 21 side. The laminate 10 has an upper surface V and a lower surface U at both ends in the thickness direction.

The stacked body 10 has one end portion 10A, a central portion 10B, and the other end portion 10C, as in the first contact member 21. The one end portion 10A is a region from one end in the longitudinal direction (X-axis direction) to 25% of the length of the long side of the laminate 10, the other end portion 10C is a region from the other end in the longitudinal direction to 25% of the length of the long side, and the central portion 10B is a region remaining after the one end portion 10A and the other end portion 10C are removed from the laminate 10.

Next, the laminate 10 is sandwiched and fixed between the first contact member 21 and the second contact member 31 such that the contact surface a of the first contact member 21 is in contact with one surface (upper surface) in the thickness direction of the laminate 10, and the contact surface E of the second contact member 31 is in contact with the other surface (lower surface) in the thickness direction of the laminate 10. Specifically, after the laminate 10 is placed on the contact surface E of the second contact member 31 connected to the fixing portion 61, the first contact member 21 is moved downward by the driving of the pressing portion 60, and the laminate 10 is pressed in the thickness direction by the contact surface a and the contact surface E.

Here, the one end portion 21A of the first contact member 21 is in contact with a part of the one end portion 10A of the upper surface V of the stacked body 10, the central portion 21B of the first contact member 21 is in contact with a part of the central portion 10B of the upper surface V of the stacked body 10, and the other end portion 21C of the first contact member 21 is in contact with a part of the other end portion 10C of the upper surface V of the stacked body 10.

Further, the one end portion 31A of the second contact member 31 is in contact with a part of the one end portion 10A of the lower surface U of the stacked body 10, the central portion 31B of the second contact member 31 is in contact with a part of the central portion 10B of the lower surface U of the stacked body 10, and the other end portion 31C of the second contact member 31 is in contact with a part of the other end portion 10C of the lower surface U of the stacked body 10.

In the present embodiment, by such a pressing method, when the maximum value and the minimum value of the pressure in the plane of the contact surface a of the first contact member 21 are Pmax and Pmin, respectively, at the time of fixing by pressing, the laminated body 10 is fixed so as to satisfy Pmin ≧ 0.4 Pmax. It is preferable that Pmin is equal to or greater than 0.5Pmax, more preferably Pmin is equal to or greater than 0.6Pmax, and still more preferably Pmin is equal to Pmax, but an effect can be obtained as long as Pmin is equal to or greater than 0.4 Pmax.

As in the present embodiment, when the first jig 20 having the tip member 23 is used to press the one end portion 21A and the other end portion 21C of the first contact member 21 toward the second contact member 31, the one end portion 10A and the other end portion 10C in the longitudinal direction of the laminated body 10 can be reliably pressed by the contact surface a, and therefore the above-described formula is easily satisfied.

It should be noted that the confirmation whether the above formula is satisfied can be performed by using a pressure-sensitive sheet. The pressure-sensitive sheet is a sheet that outputs the in-plane distribution of the magnitude of the received pressure as an electrical signal, or a sheet that can record the magnitude of the received pressure by color development. Specifically, it is sufficient to fix the laminate 10 in a state where the pressure-sensitive sheet is sandwiched between the laminate 10 and the first contact member 21 in advance, and then confirm whether or not the above-described formula is satisfied based on an actual measurement value of the pressure distribution in the contact surface a. In addition, the first contact member 21 provided with the pressure-sensitive sheet on the contact surface a may be used for each measurement.

On the premise that the above formula is satisfied, the maximum value of the pressure at the contact surface a when fixed by pressing may be, for example, 0.3 to 1.0MPa, and preferably 0.3 to 0.6 MPa.

Next, in a state where the stacked body 10 is fixed, the side surface of the end mill 44 that rotates about the axis parallel to the thickness direction of the stacked body 10 is brought into contact with the end face EF of the stacked body 10, and the end mill 44 is moved along the end face in the direction orthogonal to the thickness direction, that is, in the long-side or short-side direction, thereby processing each end face EF. Specific examples of the machining include cutting. This enables the planar shape (dimensions, squareness, etc.) of each film 12 constituting the laminate 10 to be accurately formed into a predetermined shape.

Here, 75% or more of the entire end face EF of the laminated body 10 may be processed, or 90% or more, 95% or more, 99% or more, and 100% or more thereof may be processed.

Thereafter, the pressing by the pressing portion 60 is released, and the laminated body 10 is taken out from between the first contact member 21 and the second contact member 31, whereby the laminated body 10 having the end faces processed with high accuracy can be obtained. If necessary, the separated membranes 12 can be obtained by separating each membrane 12 from the laminate 10.

According to the present embodiment, when the maximum value and the minimum value of the pressure at the contact surface a of the first contact member 21 are Pmax and Pmin, respectively, the laminate 10 is fixed so as to satisfy Pmin ≧ 0.4Pmax, and therefore, the vicinity of the end face of the laminate 10 can be fixed over the entire circumference with a uniform force, and the end portion of each film is prevented from shifting during processing, thereby improving the processing accuracy.

On the other hand, for example, when Pmin ≧ 0.4Pmax is not satisfied, such as when the first jig 20 without the tip member 23 is used, the pressure at the end in the longitudinal direction is likely to decrease at the contact surface A. In this case, the end portions of the film in the longitudinal direction are likely to be displaced, and the accuracy is likely to be lowered.

In addition, when a jig having a ring-shaped contact surface a is used, the end portion can be more easily pressed selectively.

The present invention is not limited to the above embodiments, and various modifications can be made.

For example, the shape of the film and the laminate 10 is not limited to a rectangle, and may be a shape having a longitudinal direction. Examples of shapes are rounded rectangles, ellipses (including oblongs). In this case, the aspect ratio of the film and the laminate is preferably 1.01 to 3.00, in addition to 0. The length of the film in the longitudinal direction may be, for example, 100mm or more. When the length of the long side of the minimum circumscribed rectangle is LL and the length of the short side is SS, the aspect ratio of a film or the like having a shape other than a rectangle is defined by LL/SS.

The outer shapes of the first contact member 21 (contact surface a) and the second contact member (contact surface E) may be appropriately set so as to match the outer shape of the laminated body 10. For example, if the outer shape of the laminated body 10 is an ellipse, the outer shapes of the first contact member 21 (contact surface a) and the second contact member (contact surface E) are preferably also ellipses, and if the outer shape of the laminated body 10 is a rounded rectangle, the outer shapes of the first contact member 21 (contact surface a) and the second contact member (contact surface E) may be also rounded rectangles. In this case, the contact surfaces a and E may be formed in an elliptical ring shape or a rounded rectangular ring shape. In this case, the protruding amount T of the stacked body 10 from the outer ends of the first contact member 21 (contact surface a) and the second contact member (contact surface E) is preferably also in the above range.

Fig. 8 shows an example of the laminated body 10, the first contact member 21, and the first jig 20 in a case where the shape of the laminated body 10 is an ellipse (oval) when viewed from the thickness direction. The first contact member 21 is an elliptical (oblong) plate corresponding to the shape of the stacked body, and the contact surface a with the stacked body 10 is an elliptical ring. One end portion 21A of the first contact member 21 is in contact with a part of the one end portion 10A of the surface (upper surface) V of the laminate 10, the central portion 21B of the first contact member 21 is in contact with a part of the central portion 10B of the surface V of the laminate 10, and the other end portion 21C of the first contact member 21 is in contact with a part of the other end portion 10C of the surface V of the laminate 10.

The surfaces C of the two ends N of the tip member 23 each have a meniscus shape. The surface C of the end portion N of the tip member 23 is in contact with a part of the one end portion 21A and a part of the other end portion 21C in the longitudinal direction (X-axis direction) of the surface B of the first contact member 21, and the tip member 23 is not in contact with the central portion 21B in the longitudinal direction.

In the above embodiment, the contact surface a of the first contact member 21 has an annular shape, but is not limited thereto. For example, the contact surface a may be formed in a rectangular shape or an elliptical shape without providing a non-contact portion that does not contact the laminate 10 at the center thereof.

The contact surface E of the second contact member 31 may be formed in a shape other than a ring shape. For example, the contact surface E may have a shape without a non-contact portion such as a recess or a penetration portion in the center, for example, a rectangular shape or an elliptical shape. However, the shape of the contact surface E is preferably the same as the contact surface a.

In the above embodiment, the side surface of the end mill 44 rotating about the axis parallel to the thickness direction of the stacked body 10 is brought into contact with the end face EF of the stacked body 10 to perform the machining, but the machining is not limited to this, and for example, the machining may be performed by bringing the side surface of the end mill 44 rotating about the axis perpendicular to the thickness direction of the stacked body 10 and parallel to the end face EF into contact with the end face EF of the stacked body 10.

Incidentally, the configurations of the processing portion 40 and the pressing portion 60 are not limited to the above-described configurations. For example, although the end mill is used in the above embodiment, a tool other than the end mill, for example, a planer tool, may be used. In the above embodiment, the fixing portion 61 is located below and the pressing portion 60 is located above, but the arrangement may be reversed, or the fixing portion may not be provided and the pair of pressing portions 60 may be arranged vertically.

In the above embodiment, Pmin ≧ 0.4Pmax was realized using the tip member 23, but other methods may be used as long as Pmin ≧ 0.4Pmax is satisfied. For example, as shown in fig. 9, the one end portion 21A and the other end portion 21C of the first contact member 21 are independently pressed by a pair of pressing portions 60. In this embodiment, the lower surfaces C of the first jigs 20 provided on the two pressing portions 60, respectively, can press the one end portion 21A and the other end portion 21C of the first contact member 21 from the upper surfaces without pressing the central portion 21B.

When the stacked body 10 is pressed by the pair of pressing portions 60, the shape of the contact surface E of the second contact member 31 that contacts the stacked body 10 is preferably a shape in which a concave portion P serving as a non-contact portion is provided at the center, similarly to the contact surface a of the first contact member 21. Further, in the pressing step, when the maximum value and the minimum value of the pressure on the contact surface E are Pmax (1) and Pmin (1), respectively, it is preferable that Pmin (1) ≧ 0.4Pmax (1) is satisfied.

In the above embodiment, the second jig 30 shown in fig. 1 may have a tip member or the like at the tip end similar to the tip member 23 of the first jig 20, and selectively press the one end portion 31A and the other end portion 31C without pressing the central portion 31B. For example, as shown in fig. 10, the second jig 30 may have a distal end member 33 and a coupling portion 35. The front end member 33 and the coupling portion 35 may have the same configuration as the front end member 23 and the coupling portion 25 of the first jig 20, and the front end member 33 selectively presses the one end portion 31A and the other end portion 31C of the second contact member 31 without pressing the central portion 31B.

In the above embodiment, from the viewpoint of being applied to a case where the processing accuracy is likely to be lowered, the aspect ratio of the outer shape of the laminate 10 is greater than 1, and the aspect ratio of the outer shape of the first contact member 21 (contact surface a) and the second contact member 31 (contact surface E) is greater than 1, but the embodiment may be applied to a case where the aspect ratio of the outer shape of the laminate 10 is 1, and the aspect ratio of the outer shape of the first contact member 21 (contact surface a) and the second contact member 31 (contact surface E) is 1, for example, a case of a square shape, a circular shape, or the like.

[ examples ]

(example 1)

An end face of a laminate having 101 sheets of polarizing plates was processed by an end mill using the end face processing apparatus shown in fig. 1 to 6 under the following conditions.

A polarizing plate: the polarizing plate is formed by sequentially laminating polyethylene terephthalate [ PET ], triacetylcellulose [ TAC ], polyvinyl alcohol [ PVA ], TAC, a retardation film, an adhesive layer, and PET. The thickness is 260 μm, the long side is 155.6mm, and the short side is 75.6mm

An end face machining device: a biaxial polarizer processing machine (PLPB-3523CWA) manufactured by Megaro Technica corporation, in which the following specifications are added

Front end member 23: the long side is 134mm, the short side is 54mm, the thickness of both end portions N is 11mm, the thickness of the central portion M is 10mm, the projecting amount of both end portions N relative to the central portion M is 1mm, the width W in the longitudinal direction of the surface C is 20mm

Shape of the first contact member 21 and the second contact member 31: the rectangular plate, the contact surface is the rectangular ring, the width S of ring is 10mm, the thickness is 5mm, the long edge is 154mm, the short edge is 74mm

Material of the first contact member 21 and the second contact member 31: stainless steel

Processing conditions are as follows: projection amount T: 0.8mm, stock removal: 0.3mm

When a pressure measuring film (trade name: Prescale, ultra low pressure (LLLW); manufactured by FUJIFILM) was provided on the contact surface A to measure the pressure distribution at the time of fixing during the above processing, Pmin was 0.4 Pmax. The dimensional deviation was 14 μm and the squareness deviation was 0.016 °.

In this example and the following comparative examples, the processed polarizing plates were taken out one by one from the upper part, the middle part, and the lower part in the stacking direction of the processed laminate, and the long side and short side dimensions at three points in total, i.e., the both ends and the center of each processed polarizing plate, were measured, and the maximum range of the dimensional difference between the measured value and the design dimension of each side (i.e., the difference between the maximum value Max of the dimensional difference and the minimum value Min of the dimensional difference) was indicated.

The squareness deviation is a maximum value of a deviation amount of an angle between an angle CC and a design value (right angle) when a straight line AA parallel to a long side and a straight line BB parallel to a short side are created using the coordinate data of each side after the measurement and an intersection angle of the straight line AA and the straight line BB is assumed to be CC.

(example 2)

As shown in fig. 10, a test was performed in the same manner as in example 1, except that the second jig 30 having the distal end member 33 and the coupling portion 35 was used. The tip member 33 is made of the same material and size as the tip member 23.

Pmin is 0.5 Pmax. The dimensional deviation is 16 μm and the right angle deviation is 0.017 °.

Comparative example 1

A test was performed in the same manner as in example 1, except that the tip member 23 was not used, and the first contact member 21 was pressed by the connecting portion 25. Pmin is 0.1 Pmax. The dimensional deviation was 65 μm and the squareness deviation was 0.040 °.

Comparative example 2

As the tip member 23, as shown in fig. 11, a test was performed in the same manner as in example 1 except that, in addition to both end portions N having a width W in the longitudinal direction of the C-plane of 20mm, a convex portion NN having a width W2 in the longitudinal direction of 10mm, a thickness of 1mm, and extending parallel to the end portion N was provided at a position of the center portion M as a center in the longitudinal direction. The protruding amounts of the two end portions N and the protruding portions NN with respect to the central portion M are 1mm, and the protruding portions NN contact the central portion 21B of the first contact member 21. Pmin is 0.1 Pmax. The dimensional deviation was 68 μm and the squareness deviation was 0.040 °.

The results are summarized in table 1.

[ Table 1]

Claims

1. A method of processing an end face of a laminate having a multilayer film,

a step of processing the end face of the fixed laminate,

the Pmin is more than or equal to 0.4 Pmax.

2. The method of claim 1, wherein,

the laminate has a shape having a longitudinal direction when viewed from a thickness direction,

the first contact member has one end portion and the other end portion that are in contact with one end portion and the other end portion of the laminated body in the longitudinal direction, respectively,

in the pressing step, the one end portion and the other end portion of the first contact member are relatively pressed toward the second contact member.

3. The method of claim 2, wherein,

in the pressing step, the first contact member is pressed toward the second contact member by a first jig that is in contact with the one end portion and the other end portion of the first contact member and that is not in contact with a central portion between the one end portion and the other end portion of the first contact member.

4. The method of claim 3, wherein,

the first clamp is a metal member.

5. The method according to any one of claims 2 to 4,

the second contact member has one end portion and the other end portion that are in contact with one end portion and the other end portion of the stacked body in the longitudinal direction, respectively.

6. The method according to any one of claims 1 to 5,

the method processes 75% or more of the entire end face of the laminate.

7. The method according to any one of claims 1 to 6,

the first contact member is a metal member.

8. The method according to any one of claims 1 to 7,

the shape of a contact surface a of the first contact member that contacts the stacked body is annular.

9. The method of claim 8, wherein,

the width of the ring of the contact surface A is 5-25 mm.

10. The method of claim 8 or 9,

the shape of a contact surface a of the first contact member that contacts the stacked body is a rectangular ring shape or an elliptical ring shape.

11. The method according to any one of claims 8 to 10,

before the step of processing, the outer end of the fixed laminate protrudes outward by 0.8 to 1.5mm from the outer end of the contact surface A of the first contact member, which is in contact with the laminate, when viewed in the thickness direction of the laminate.

12. The method according to any one of claims 1 to 11,

the shape of a contact surface E of the second contact member that contacts the stacked body is annular.

13. The method according to any one of claims 1 to 12,

the machining step includes a step of bringing a side surface of an end mill into contact with the end surface of the stacked body, the end mill being rotated about an axis parallel to a thickness direction of the stacked body.

14. The method according to any one of claims 1 to 13,

the thickness of the first contact member is 2-15 mm.

15. The method according to any one of claims 1 to 14,

at least one layer of the multilayer film is a resin film.

16. A method for producing an end-face-processed film, comprising:

a step of laminating the multilayer film to obtain a laminate; and

a step of processing an end face of the laminate,

the method for producing an end face of a laminate according to any one of claims 1 to 15, wherein the end face of the laminate is processed.

17. An end face processing device for processing an end face of a laminated body having a multilayer film,

the end surface processing device is provided with:

a first clamp connected with the first contact member;

a second clamp connected with the second contact member;

18. The apparatus of claim 17, wherein,

19. The apparatus of claim 17 or 18,

the second contact member has a shape having a longitudinal direction when viewed from a pressing direction,