JP5185313B2 - Peeling method and peeling device - Google Patents

Description

  The present invention comprises a pressure-sensitive adhesive layer, a long heavy release film, and a long light release film that can be peeled from the pressure-sensitive adhesive layer with a peeling force smaller than that of the heavy release film. It relates to a peeling method and a peeling device for conveying a long film laminate formed by laminating a film, an adhesive layer and a light release film in this order, and continuously peeling the light release film from the film laminate. is there.

  Currently, a liquid crystal display device in which polarizing plates are bonded to both surfaces of a liquid crystal panel is generally manufactured. The manufactured liquid crystal display device is modularized and then subjected to various assembling steps to be used as mobile devices such as notebook personal computers and mobile phones, and various products (final products) such as large televisions.

  The polarizing plate is used for bonding to a sheet-like liquid crystal panel by unwinding a long polarizing plate roll wound up in a roll shape and cutting it into a predetermined length. The said polarizing plate original fabric is comprised by laminating | stacking an adhesive layer, a polarizing film, an adhesive layer, and a protective film in this order with respect to a peeling film, for example. Among the above-mentioned pressure-sensitive adhesive layers, one pressure-sensitive adhesive layer is formed to bond a release film to a polarizing film and to bond the polarizing film to a liquid crystal panel. Of the pressure-sensitive adhesive layers, the other pressure-sensitive adhesive layer is formed to bond a protective film to the polarizing film.

  Generally, the said adhesive layer in a polarizing plate is formed by bonding the adhesive layer laminated | stacked on the peeling film (and protective film) to a polarizing film. Specifically, it comprises a pressure-sensitive adhesive layer, a long heavy release film, and a long light release film that can be peeled from the pressure-sensitive adhesive layer with a release force smaller than that of the heavy release film. After peeling the light release film from the long film laminate obtained by laminating the release film (that is, the film to be the release film or the protective film), the pressure-sensitive adhesive layer and the light release film in this order, the pressure-sensitive adhesive layer is removed. The said adhesive layer in a polarizing plate is formed by bonding to a polarizing film. In addition, the said film laminated body may be called a noncarrier film (what is called a double-sided tape).

  And conventionally, various peeling apparatuses for peeling a light release film from the film laminate have been proposed. For example, Patent Document 1 describes a separate film peeling apparatus that prevents the tension (tension) of a web from fluctuating when peeling a separate film (lightly peeled film) from a web (film laminate). Yes. Moreover, in patent document 2, a 1st sheet (lightly peelable film) can be smoothly peeled from a sheet | seat (film laminated body), and the 2nd sheet (heavy release film and adhesive layer) after peeling is used. A transfer peeling apparatus for preventing dust and the like from attaching is described.

JP 2002-201439 (published July 19, 2002) JP 11-208985 (released on August 3, 1999)

  In the separate film peeling apparatus described in the above-mentioned Patent Document 1, as shown in FIG. 1, only the separate film is peeled by applying tension. That is, the tension of the separate film is controlled, while the speed of the web from which the separate film has been peeled is controlled (winding control). Moreover, in the transfer peeling apparatus described in the above-mentioned Patent Document 2, as described in paragraph [0024] and FIG. 1, the sheet, the first sheet, and the second sheet are peeled by applying tension. There is no specific description of what tension is applied to these three sheets. That is, the transfer peeling apparatus described in Patent Document 2 merely peels the sheet, the first sheet, and the second sheet by applying tension.

  When peeling the light release film from the film laminate, it is necessary that the pressure-sensitive adhesive layer does not remain on the light release film side. However, in the conventional peeling apparatus, no special consideration (description) regarding what kind of tension is specifically applied to the film (sheet) corresponding to the heavy release film and the light release film has not been made. Therefore, the conventional peeling apparatus has a problem that the method of peeling the film (sheet) becomes unstable, and an adhesive layer (transfer layer) corresponding to the adhesive layer may remain on the film (sheet) side. ing.

  When the release method of the light release film becomes unstable, a phenomenon occurs in which the pressure-sensitive adhesive layer separates into the heavy release film side and the light release film side (specifically, the pressure-sensitive adhesive layer is peeled cleanly from the light release film). Without tearing or pulling the thread). In particular, if the widthwise end surface of the film laminate to be peeled is a cut surface, the above-described phenomenon is likely to occur because the end surface has minute irregularities (so-called “rolling”). Even if the pressure-sensitive adhesive layer causing the above phenomenon is bonded to a polarizing film, a polarizing plate having excellent quality cannot be produced.

  The present invention has been made in view of the above problems, and its main purpose is to continuously and stably peel the light release film from the film laminate so that the pressure-sensitive adhesive layer does not remain on the light release film side. An object of the present invention is to provide a peeling method and a peeling apparatus that can be used.

  In order to solve the above-mentioned problems, the peeling method according to the present invention can peel from the pressure-sensitive adhesive layer with a pressure-sensitive adhesive layer, a long heavy-release film, and a smaller peeling force than the heavy-release film. It consists of a long light release film, and conveys a long film laminate formed by laminating the above heavy release film, pressure-sensitive adhesive layer and light release film in this order, and uses a peeling roller from the film laminate. A method for continuously peeling the light release film, wherein the tension of the light release film to be conveyed and the tension of the heavy release film are controlled so as to be constant, respectively, with respect to the transport direction of the light release film. The transport direction of the heavy release film is changed along the release roller.

  According to said structure, since the tension | tensile_strength and heavy peeling of the light peeling film conveyed are controlled (tensile control) so that the tension | tensile_strength of the light peeling film conveyed and the tension | tensile_strength of a heavy peeling film may become respectively constant. Since the tension of the film is constant and does not fluctuate, wrinkles are less likely to occur in the light release film and the heavy release film, and the possibility that the release position moves from the release roller is eliminated (the release position can be stabilized). ). Therefore, the light release film can be stably peeled so that the pressure-sensitive adhesive layer does not remain on the light release film side. Thereby, the peeling method which can peel a light peeling film continuously from a film laminated body stably so that an adhesive layer does not remain in the light peeling film side can be provided.

  Moreover, it is more preferable that the peeling method according to the present invention further changes the transport direction of the light release film along the peeling roller. In the peeling method according to the present invention, it is more preferable to control the tension of the light release film to be conveyed and the tension of the heavy release film to 50 N or more, respectively. In the peeling method according to the present invention, it is more preferable that the tension of the heavy release film to be conveyed is greater than or equal to the tension of the light release film. As for the peeling method which concerns on this invention, it is more preferable that the angle of the conveyance direction of the heavy peeling film with respect to the conveyance direction of a light peeling film is 35 degrees or more and 180 degrees or less.

  By these methods, the light release film can be continuously and more stably peeled from the film laminate so that the pressure-sensitive adhesive layer does not remain on the light release film side.

  In the peeling method according to the present invention, the end surface in the width direction of the film laminate may be a cut surface. According to said structure, since a light peeling film can be peeled stably continuously, even if the width direction end surface of the film laminated body to peel is a cut surface, that is, a micro unevenness | corrugation (in the said end surface ( Even if there is a so-called “crust”, the pressure-sensitive adhesive layer does not remain on the light release film side.

  Moreover, as for the peeling method which concerns on this invention, it is more preferable that the width | variety of the said film laminated body is 200 mm or more.

  In order to solve the above problems, the peeling device according to the present invention can peel from the pressure-sensitive adhesive layer with a pressure-sensitive adhesive layer, a long heavy-release film, and a peeling force smaller than that of the heavy-release film. It consists of a long light release film and conveys a long film laminate formed by laminating the above heavy release film, pressure-sensitive adhesive layer and light release film in this order, and the light release film from the film laminate. A peeling device that continuously peels off, a peeling roller that changes the transport direction of the heavy release film with respect to the transport direction of the light release film, and the tension of the light release film and the tension of the heavy release film that are conveyed are kept constant. It is characterized by comprising a control unit that controls the above and a measurement unit that measures the tension of the light release film and the tension of the heavy release film.

  According to said structure, since the tension | tensile_strength of the light peeling film conveyed and the tension | tensile_strength of a heavy peeling film are respectively controlled so that it may become fixed by a control part (Tension control), That is, Since the tension and the tension of the heavy release film are both constant and do not fluctuate, wrinkles are less likely to occur on the light release film and the heavy release film, and the possibility that the release position moves from the release roller is eliminated (the release position is stable). Can be made). Therefore, the light release film can be stably peeled so that the pressure-sensitive adhesive layer does not remain on the light release film side. Thereby, the peeling apparatus which can peel the light peeling film continuously from a film laminated body stably so that an adhesive layer does not remain in the light peeling film side can be provided.

  Moreover, it is more preferable that the peeling apparatus according to the present invention further includes a variable guide roller that arbitrarily changes the angle of the heavy release film in the transport direction with respect to the light peel film transport direction. According to the above configuration, depending on the type of film laminate, that is, depending on various conditions such as the material, properties, and thickness of the light release film, the pressure-sensitive adhesive layer and the heavy release film, the transport direction of the light release film The angle of the transport direction of the heavy release film with respect to can be changed. Thereby, the peeling apparatus which can peel a light peeling film continuously and more stably from a film laminated body can be provided.

  The peeling device according to the present invention further includes a transport roller for transporting the lightly peeled film and the heavy peel film after peeling, and the measuring unit is provided on the transport roller, so that the holding angle of the transport roller is constant. More preferably, a fixed guide roller for adjusting the transport direction of the light release film and the heavy release film is further provided between the variable guide roller and the transport roller. According to said structure, even if the angle of the conveyance direction of the heavy peeling film with respect to the conveyance direction of a light peeling film is changed, the holding angle of the light peeling film and heavy peeling film in a conveyance roller is made constant by a fixed guide roller. Can do. That is, since the measurement conditions of the tension of the light release film and the tension of the heavy release film by the measurement unit can always be kept constant, the tension control by the control unit can be performed more stably. Thereby, the peeling apparatus which can peel a light peeling film continuously and more stably from a film laminated body can be provided.

  According to the peeling method and the peeling apparatus according to the present invention, the tension of the light release film to be conveyed and the tension of the heavy release film are constant and do not fluctuate so that the pressure-sensitive adhesive layer does not remain on the light release film side. In addition, the light release film can be stably peeled off. Thereby, the effect that the peeling method and peeling apparatus which can peel the light peeling film continuously from a film laminated body stably so that an adhesive layer does not remain in the light peeling film side can be provided. Play.

FIG. 1 is a front view illustrating a schematic configuration of an example of a peeling apparatus according to the present invention. It is a front view which shows another example of the peeling apparatus which concerns on this invention, and shows a schematic structure.

  The peeling apparatus according to the present invention comprises a pressure-sensitive adhesive layer, a long heavy release film, and a long light release film that can be peeled off from the pressure-sensitive adhesive layer with a peeling force smaller than that of the heavy release film. A peeling device that transports a long film laminate formed by laminating the heavy release film, the pressure-sensitive adhesive layer, and the light release film in this order, and continuously peels the light release film from the film laminate. A peeling roller that changes the transport direction of the heavy release film relative to the transport direction of the light release film, and a control unit that controls the tension of the light release film and the tension of the heavy release film to be constant, And a measurement unit that measures the tension of the light release film and the tension of the heavy release film.

  Moreover, the peeling method according to the present invention includes a pressure-sensitive adhesive layer, a long heavy release film, and a long light release film that can be peeled from the pressure-sensitive adhesive layer with a smaller peeling force than the heavy release film. A long film laminate formed by laminating the heavy release film, the pressure-sensitive adhesive layer, and the light release film in this order, and continuously using the release roller from the film laminate. The peeling direction of the heavy release film is controlled in such a manner that the tension of the light release film to be conveyed and the tension of the heavy release film are controlled to be constant, respectively. Is changed along the peeling roller.

  In the present invention, “tension” refers to the stress applied per unit time and unit area to the film laminate, light release film or heavy release film.

[Embodiment 1]
An embodiment according to the present invention will be described below with reference to FIG.

  First, an example of a film laminate that is peeled off by the peeling device according to the present invention will be described. The film laminate comprises a pressure-sensitive adhesive layer, a long heavy release film, and a long light release film that can be peeled from the pressure-sensitive adhesive layer with a release force smaller than that of the heavy release film. It is a long film laminate formed by laminating a heavy release film, an adhesive layer and a light release film in this order. In addition, the said film laminated body may be called a noncarrier film (what is called a double-sided tape).

  As an adhesive which comprises the said adhesive layer, the well-known adhesive which has polymers, such as an acrylic resin and a polyurethane resin, as a main component is mentioned, for example. In particular, when transparency is required, a known pressure-sensitive adhesive mainly composed of an acrylic resin is more preferable. The known pressure-sensitive adhesive is a viscoelastic body, also called a pressure-sensitive adhesive, and adheres to the surface (attachment surface) of the adherend simply by pressing, while the surface (attachment) is peeled off from the adherend. It has the property that it can be peeled off so that no pressure-sensitive adhesive remains on the (surface) side (substantially leaving no trace) (provided that the adherend has sufficient strength to withstand peeling). The pressure-sensitive adhesive layer can be formed, for example, by applying a solution obtained by dissolving the pressure-sensitive adhesive in a solvent to the heavy release film or the light release film and drying it. Although the thickness of the said adhesive layer is not specifically limited, Generally it is 5 micrometers or more.

  For example, when the pressure-sensitive adhesive layer is bonded to the polarizing film, that is, in the polarizing plate manufactured by bonding the pressure-sensitive adhesive layer to the polarizing film, the heavy release film is a release film (or protective film). ). The heavy release film is composed of a transparent resin film, for example, a polyester resin film such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate.

  The light release film is composed of a transparent resin film whose surface is subjected to a known release treatment. Accordingly, the light release film can be peeled off from the pressure-sensitive adhesive layer with a peeling force smaller than that of the heavy release film, and the surface subjected to the release treatment is bonded to the pressure-sensitive adhesive layer. It is like that. The light release film is composed of a transparent resin film, for example, a polyester resin film such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate.

  The film laminate is usually produced by preparing a wide film laminate original fabric and then cutting the film laminate original fabric into a predetermined width. Therefore, the end surface in the width direction of the film laminate is usually a cut surface. Moreover, although the width | variety of the said film laminated body is not specifically limited, Generally it is 200 mm or more. In addition, since there exists a difference in the peeling force of a heavy release film and a light release film, the elongate film laminated body is generally wound up so that the heavy release film side may become inside.

  An example of the configuration of the peeling apparatus according to the present invention will be described. As shown in FIG. 1, the peeling device 20 according to this embodiment is a peeling device that conveys a long film laminate 30 and continuously peels a light release film 31 from the film laminate 30. . The peeling device 20 includes a first nip portion 1, a second nip portion 2 and a third nip portion 3, each formed by a pair of nip rollers, a peeling roller 4, guide rollers 5, 6, 7, and conveying rollers 8, 9. It is configured. Each of these rollers is fixed to a casing (not shown) of the peeling device 20.

  The first nip portion 1 has a function of continuously carrying out the long film laminate 30 unwound from the unwinding portion (not shown) toward the peeling roller 4 side. The pair of nip rollers that form the first nip portion 1 are provided such that their shaft cores (center axes) are parallel to each other, and are formed of a soft material such as rubber, for example. Specific examples of the nip roller include known nip rollers. In addition, at least one nip roller of the pair of nip rollers is a driving roller, and the rotational speed of the nip roller can be arbitrarily adjusted, and is provided so as to be movable up and down. The pressure (nip pressure) can be adjusted as appropriate.

  The 2nd nip part 2 has the function to convey continuously so that the elongate light peeling film 31 peeled from the film laminated body 30 may be wound up by a winding part (not shown). The pair of nip rollers that form the second nip portion 2 are provided so that their shaft cores (center axes) are parallel to each other, and are formed of a soft material such as rubber, for example. Specific examples of the nip roller include known nip rollers. In addition, at least one nip roller of the pair of nip rollers is a driving roller, and the rotational speed of the nip roller can be arbitrarily adjusted, and provided so as to be movable up and down. The pressure (nip pressure) can be adjusted as appropriate.

  In the third nip portion 3, the long heavy release film 32 (laminated body of the heavy release film and the pressure-sensitive adhesive layer) from which the light release film 31 has been peeled is subjected to the next step (for example, a bonding step with a polarizing film). It has the function to convey continuously toward the apparatus (not shown: for example, bonding apparatus) which performs. The pair of nip rollers that form the third nip portion 3 are provided so that their shaft cores (center axes) are parallel to each other, and are made of a soft material such as rubber, for example, and the adhesive layer is difficult to adhere thereto. It is made of a material (which does not substantially adhere) or a material whose surface is subjected to a known release treatment. In addition, at least one nip roller of the pair of nip rollers is a driving roller, and the rotational speed of the nip roller can be arbitrarily adjusted. The pressure (nip pressure) can be adjusted as appropriate.

  And after the heavy release film 32 (laminated body of a heavy release film and an adhesive layer) in the film laminated body 30 is carried out from the said 1st nip part 1, the peeling roller 4, the guide roller 7, and the conveyance roller 9 It is conveyed to the third nip portion 3 via the. On the other hand, the light release film 31 in the film laminate 30 is transported to the second nip portion 2 through the release roller 4, the guide rollers 5 and 6, and the transport roller 8 after being unloaded from the first nip portion 1. It has become so. Further, the tension of the heavy release film 32 conveyed between the first nip portion 1 and the third nip portion 3 is controlled (tension control) to be always constant. It is controlled (tension control) so that the tension of the light release film 31 conveyed between the two nip portions 2 is always constant.

  The peeling roller 4 is disposed on the downstream side of the first nip portion 1 (downstream in the transport direction of the film laminate 30) so as to come into contact with the heavy release film 32 side in the film laminate 30. The light release film 31 has a function of continuously peeling. The peeling roller 4 is a non-driven transport roller, and is formed of a soft material such as rubber or a hard material such as metal. Specific examples of the peeling roller 4 include known (general) rollers. And the peeling roller 4 changes the conveyance direction of the said heavy peeling film 32 with respect to the conveyance direction of the said light peeling film 31. FIG. That is, the heavy release film 32 in the film laminate 30 in contact with the release roller 4 is conveyed by being wound around the release roller 4 (along the release roller 4) with its transport direction (traveling direction) changed. The light release film 31 is conveyed without wrapping around the separation roller 4 (without changing the conveyance direction). As a result, the peeling roller 4 continuously separates the film laminate 30 into a heavy release film 32 (a laminate of a heavy release film and an adhesive layer) and a light release film 31.

  The guide rollers 5, 6, and 7 are non-driving rollers, and are formed of a soft material such as rubber or a hard material such as metal. Specific examples of the guide rollers 5, 6, and 7 include known (general) rollers. The guide rollers 5 and 6 change the transport direction of the light release film 31, and the guide roller 7 changes the transport direction of the heavy release film 32.

  The guide roller 5 is disposed on the downstream side of the peeling roller 4 (downstream in the transport direction of the light release film 31) so as to contact the surface of the light release film 31 that has not been bonded to the adhesive layer. Yes. The guide roller 6 is arrange | positioned in the downstream of the guide roller 5 so that the surface of the side which was not bonded to the adhesive layer in the light peeling film 31 may be contacted.

  The guide roller 7 is disposed on the downstream side of the peeling roller 4 (on the downstream side in the transport direction of the heavy peeling film 32) so as to contact the surface of the heavy peeling film 32 on which the adhesive layer is not bonded. .

  In the guide rollers 5 and 7, the angle θ in the transport direction of the heavy release film 32 with respect to the transport direction of the light release film 31 is, for example, preferably 35 ° or more and 180 ° or less, more preferably 60 ° or more, 120 It is arranged so that it is less than °. Thereby, the light release film 31 can be continuously and more stably peeled from the film laminate 30 so that the pressure-sensitive adhesive layer does not remain on the light release film 31 side.

  The transport rollers 8 and 9 are non-driving rollers, and are formed of a soft material such as rubber or a hard material such as metal. Specific examples of the transport rollers 8 and 9 include known (general) rollers. The conveyance roller 8 is disposed on the downstream side of the guide roller 6 so as to contact the surface of the light release film 31 that has not been bonded to the adhesive layer. The conveyance roller 9 is arrange | positioned in the downstream of the guide roller 7 so that the surface of the side in which the adhesive layer in the heavy peeling film 32 is not bonded may be contacted.

  The transport roller 8 is provided with a measuring unit 10a for measuring the tension of the light release film 31, and the transport roller 9 is provided with a measuring unit 10b for measuring the tension of the heavy release film 32. Yes. Accordingly, the transport rollers 8 and 9 are so-called tension pickup rollers. Specific examples of the measuring units 10a and 10b include known (general) tension measuring devices. Measurement data measured by the measurement units 10a and 10b is output to a control unit described later.

  And the said 2nd nip part 2 is arrange | positioned in the downstream of the conveyance roller 8 (the conveyance direction downstream of the light peeling film 31), and the downstream of the conveyance roller 9 (the conveyance direction downstream of the heavy peeling film 32). The third nip portion 3 is disposed.

  Further, the peeling device 20 analyzes the measurement data input from the measurement units 10a and 10b, and each of the nip rollers that form the first nip portion 1, the second nip portion 2, and the third nip portion 3 according to the analysis result. Is provided with a control unit (not shown) for controlling (adjusting) various conditions such as the rotation speed and pressure (nip pressure). And what kind of control a control part performs concretely according to an analysis result is previously input (instruction) by users, such as an operator.

  According to the peeling device 20 having the above configuration, the tension of the light release film 31 and the tension of the heavy release film 32 to be conveyed are controlled to be constant by the control unit (tension control), that is, conveyed. Since the tension of the light release film 31 and the tension of the heavy release film 32 are constant and do not fluctuate, wrinkles are less likely to occur in the light release film 31 and the heavy release film 32, and the release position is determined from the release roller 4. There is no fear of movement (the peeling position can be stabilized). Therefore, the light release film 31 can be stably peeled so that the pressure-sensitive adhesive layer does not remain on the light release film 31 side. Thereby, the peeling apparatus which can peel the light peeling film 31 continuously from the film laminated body 30 stably so that an adhesive layer does not remain in the light peeling film 31 side can be provided.

  Next, the peeling method which peels the light peeling film 31 from the elongate film laminated body 30 with the peeling apparatus 20 of the said structure is demonstrated. In this description, it is assumed that preparations such as attaching (pinching) the film laminate, the light release film, and the heavy release film to each nip portion have already been completed.

  First, by driving the nip rollers that form the first nip portion 1, the second nip portion 2, and the third nip portion 3, respectively, the film laminate 30, the light release film 31, and the heavy release film 32 are each provided with a constant tension ( And speed). Specifically, by adjusting the rotational speed of the nip roller that forms the first nip portion 1 and the second nip portion 2, that is, adjusting the rotational speed of the nip roller that forms the second nip portion 2. Thus, the tension of the light release film 31 to be conveyed is controlled so as to be always constant (tension control). In addition, by adjusting the rotational speed of the nip roller that forms the first nip portion 1 and the third nip portion 3, that is, by adjusting the rotational speed of the nip roller that forms the third nip portion 3, The tension of the heavy release film 32 is controlled so as to be always constant (tension control).

  The tension of the light release film 31 and the tension of the heavy release film 32 to be conveyed are each preferably controlled to 50 N or more (tension control), more preferably 100 N or more. Moreover, it is especially preferable that the tension of the heavy release film 32 to be conveyed is greater than or equal to the tension of the light release film 31. Thereby, the light release film 31 can be continuously and more stably peeled from the film laminate 30 so that the pressure-sensitive adhesive layer does not remain on the light release film 31 side. In addition, since the conveyance speed of the light peeling film 31 conveyed and the conveyance speed of the heavy peeling film 32 are set suitably according to the material and property of these films, thickness, and the said tension | tensile_strength, it is not specifically limited. Generally, it is more preferably 1 m / min or more and 30 m / min or less.

  While the film laminate 30 is continuously carried out from the first nip portion 1 and the light release film 31 and the heavy release film 32 are continuously conveyed with the above tension, the film laminate 30 is lightly removed from the film laminate 30 on the release roller 4. The release film 31 is continuously and stably peeled off. Thereafter, the long light release film 31 passes through the second nip portion 2 via the guide rollers 5 and 6 and the conveying roller 8 and is wound around a winding portion (not shown). On the other hand, the long heavy peeling film 32 passes through the third nip portion 3 via the guide roller 7 and the conveying roller 9 and performs a next process (for example, a bonding process with a polarizing film) (not shown: For example, it is continuously conveyed toward the bonding apparatus.

  According to the above peeling method, the tension of the light release film 31 to be conveyed and the tension of the heavy release film 32 are controlled to be constant (tension control). Since the tension and the tension of the heavy release film 32 are constant and do not fluctuate, wrinkles are less likely to occur in the light release film 31 and the heavy release film 32, and the possibility that the release position moves from the release roller 4 is eliminated ( The peeling position can be stabilized). Therefore, the light release film 31 can be stably peeled so that the pressure-sensitive adhesive layer does not remain on the light release film 31 side. Thereby, the peeling method which can peel the light peeling film 31 continuously from the film laminated body 30 stably so that an adhesive layer does not remain in the light peeling film 31 side can be provided.

  The heavy release film 32, that is, the long heavy release film 32 obtained by peeling the light release film 31 from the pressure-sensitive adhesive layer is suitably used for the production of optical films such as polarizing plates and various optical members, for example.

  In addition, the said peeling roller 4 in the peeling apparatus 20 which concerns on this Embodiment is comprised with a pair of roller, one roller contacts the heavy peeling film 32 side in the film laminated body 30, and the other roller is the film laminated body 30. It arrange | positions so that the light peeling film 31 side may be contacted, and it may peel by changing the conveyance direction of the light peeling film 31 with the conveyance direction of the heavy peeling film 32. FIG. That is, while changing the conveyance direction of the heavy release film 32 and changing the conveyance direction (traveling direction) by winding the light release film 31 around the release roller (along the release roller), the film It is good also as a structure which isolate | separates the laminated body 30 into the heavy release film 32 (laminated body of a heavy release film and an adhesive layer) and the light release film 31 continuously. Even in the case of the above configuration, the light release film 31 can be continuously and stably peeled from the film laminate 30 so that the pressure-sensitive adhesive layer does not remain on the light release film 31 side.

  The peeling apparatus 20 according to the present embodiment is, for example, as a part of a manufacturing apparatus that employs a so-called Roll to Panel method for manufacturing a liquid crystal display device by continuously bonding a polarizing plate to a sheet-like liquid crystal panel. Preferably used.

  Here, as a usage example of a long heavy release film (a laminate of a heavy release film and an adhesive layer), a method for producing a polarizing plate (a polarizing film original fabric) using the heavy release film, and a polarizing plate The manufacturing method of the used liquid crystal panel is demonstrated below with the manufacturing apparatus.

  The polarizing plate is composed of a polarizing film, a protective film (that is, a heavy release film) and an adhesive layer. Examples of the polarizing film include known polarizing films. More specifically, examples of the polarizing film include known polarizing films in which protective films are bonded to both surfaces of a polarizer film, and an adhesive layer is formed on the protective film. Among the pressure-sensitive adhesive layers, one pressure-sensitive adhesive layer is bonded to a polarizing film with a release film (that is, a heavy release film having properties different from the heavy release film serving as the protective film), It is formed for bonding to a liquid crystal panel. Of the pressure-sensitive adhesive layers, the other pressure-sensitive adhesive layer is formed to bond a protective film to the polarizing film. The thickness of the protective film is not particularly limited, but is generally 10 μm or more and 100 μm or less. What is necessary is just to set the thickness of an adhesive layer suitably. The thickness of the release film is not particularly limited, but is generally 10 μm or more and 100 μm or less.

  Examples of the polarizer film include, for example, polyvinyl alcohol, partially formalized polyvinyl alcohol, partially saponified ethylene-vinyl acetate copolymer, a film made of hydrophilic polymer such as cellulose, uniaxial stretching, and pigment such as iodine. And a film subjected to various processes such as hue adjustment.

  Examples of the protective film include TAC (triacetyl cellulose) film, cycloolefin resin film, cellulose acetate resin film such as diacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate, polyester resin film such as polybutylene terephthalate, polycarbonate resin film, Known films such as an acrylic resin film and a polypropylene resin film can be used.

  The thickness of the polarizing film is not particularly limited, but is generally 10 μm or more and 300 μm or less. The polarizing film may further include other layers in addition to the above three layers (protective layer, polarizer film, protective layer) as long as there is no practical problem. Specifically, for example, the polarizing film may further include an adhesive layer (may be a pressure-sensitive adhesive layer) that bonds the polarizer film and the protective film.

  The polarizing plate manufacturing apparatus is configured to bond the long heavy release film serving as a release film or a protective film to both sides or one side of the long polarizer film via an adhesive layer. Specifically, the polarizing plate manufacturing apparatus has a transport roller for transporting the polarizer film at a constant speed and a single type of heavy release film or two types of heavy release films having different properties at a constant speed. 1 pair or two sets of transport rollers, and a bonding apparatus having a nip portion for bonding the polarizer film and the heavy release film. Then, the polarizing plate manufacturing apparatus conveys both to the nip portion of the laminating apparatus while aligning the heavy release film with respect to the polarizer film, and applies heavy pressure to the polarizer film while applying a predetermined pressure (nip pressure). A film is bonded (bonding operation).

  The polarizing plate manufacturing apparatus may be configured to simultaneously bond two types of heavy release films to both sides of the polarizer film, and to attach the heavy release film to one side of the polarizer film. After bonding, a heavy release film having properties different from those of the heavy release film may be bonded to the other surface. That is, in the polarizing plate manufacturing apparatus, the nip portion of the laminating apparatus performs a single laminating operation in which one heavy release film, the polarizer film, and the other heavy release film are sandwiched (nipped) in this order. The polarizing plate may be manufactured with a bonding device, and the bonding apparatus includes two sets of nip portions, and one nip portion is sandwiched (nipped) by sandwiching one heavy release film and a polarizer film. After combining, the other nip portion may be configured to produce a polarizing plate by two bonding operations in which the polarizer film and the other heavy release film are sandwiched (nipped) and bonded. Thereby, a long polarizing plate (a long polarizing plate bonded to a long release film) is produced.

  When the polarizing plate is bonded to the liquid crystal panel, one of the two types of heavy release films bonded to the polarizer film is a protective film and the other heavy release film is a release film. Become. Since the long polarizing plate has a difference in peeling force between the two types of heavy release films, it is generally wound up so that the side of the heavy release film serving as a protective film is on the inner side to be a long polarizing film original fabric. .

  Therefore, the polarizing film original fabric is a long polarizing film laminate composed of a polarizing film, a pressure-sensitive adhesive layer, a protective film and a release film, and on the surface of the polarizing film to be bonded to the liquid crystal panel, A release film that can be peeled through an adhesive layer (which may be a pressure-sensitive adhesive layer) is bonded, and on the back surface of the surface, an adhesive layer (may be a pressure-sensitive adhesive layer) is interposed. A protective film is bonded. That is, a polarizing plate is formed by laminating a pressure-sensitive adhesive layer, a polarizing film, a pressure-sensitive adhesive layer, and a protective film in this order with respect to the release film, and the polarizing film original fabric is formed from the polarizing plate and the release film. It is configured. The release film (also referred to as a protective film or a separator) protects the surface of the polarizing plate (the surface to be bonded to the liquid crystal panel) from scratching until the polarizing plate is bonded to the liquid crystal panel. It is peeled off from the polarizing plate when the polarizing plate is bonded to the liquid crystal panel.

  Then, the polarizing plate cut to a predetermined length from the original film of polarizing film covers the entire display area of the liquid crystal panel (the entire surface of the display screen), and is applied to both sides of the liquid crystal panel twice. It is designed to be bonded by a combination process.

  Examples of the liquid crystal panel include known liquid crystal panels. More specifically, the liquid crystal panel includes a known liquid crystal panel that includes a pair of substrates such as a glass substrate and a liquid crystal layer, and an alignment film is disposed between the substrate and the liquid crystal layer.

  The polarizing film original fabric is unwound by a polarizing film transport mechanism (not shown), and the polarizing plate peeled off from the peeling film is supplied to the nip portion of the laminating apparatus. The polarizing film transport mechanism will be described below.

  The polarizing film transport mechanism includes an unwinding unit, a winding unit, a half cutter, a knife edge, and a roller group. A long polarizing film original fabric is installed in the unwinding section, and the polarizing film original fabric is unwound. The said polarizing film original fabric is wound up by the unwinding part so that the direction of the absorption axis of a polarizing film may be located in the conveyance direction. The winding unit winds up a long release film. The roller group is provided so that a certain tension is applied to the polarizing film original fabric and the polarizing film original fabric can be conveyed. Accordingly, the polarizing film transport mechanism unwinds the long polarizing film that has been wound up in a roll and transports it to the laminating apparatus, and winds up the unnecessary long release film. .

  The half cutter is provided on the upstream side (unwinding part side) from the knife edge, and the polarizing film original fabric is half-cut to cut the polarizing film, the protective film, and the adhesive layer. That is, the half cutter cuts the long polarizing plate to a predetermined length without cutting the release film. As the half cutter, a known cutter such as a blade or a laser cutter is preferably used.

  The knife edge is configured to peel the release film from the polarizing plate cut to a predetermined length by the tip portion. The pressure-sensitive adhesive layer formed between the polarizing plate and the release film remains on the polarizing plate side after the release film is peeled off.

  The bonding process which bonds a polarizing plate to a liquid crystal panel, peeling from a elongate peeling film using the said bonding apparatus (and polarizing film conveyance mechanism) is demonstrated.

  First, the liquid crystal panel is transported at a constant speed by driving a plurality of transport rollers. Further, the upper pressure roller (and the lower pressure roller) of the laminating apparatus is rotationally driven at a constant rotational speed. This conveying operation is performed throughout the bonding process.

  Next, by rotating and driving the unwinding part and the winding part in the polarizing film transporting mechanism at a predetermined rotational speed, the polarizing film original fabric is transported at the same transporting speed as that of the liquid crystal panel, and a half cutter The long polarizing film is cut into a set length by. And while peeling a long peeling film from a polarizing plate with a knife edge and timing the bonding of the polarizing plate to the liquid crystal panel, that is, while aligning the polarizing plate with respect to the liquid crystal panel, It is conveyed to the nip part of the bonding device. Then, a polarizing plate is bonded to the liquid crystal panel while applying a predetermined pressure (nip pressure) at the nip portion (bonding step).

  That is, the polarizing plate cut to a predetermined length and peeled off from the release film by the tip of the knife edge is transported while being aligned with the nip portion of the bonding apparatus together with the liquid crystal panel, and bonded to the liquid crystal panel. Is done. That is, the polarizing plate transported to the nip portion is aligned with the liquid crystal panel so as to cover the entire display area of the liquid crystal panel (the entire surface of the display screen) (more specifically, the position of the front end in the transport direction). Are attached to the liquid crystal panel.

  Thereafter, the liquid crystal panel to which the polarizing plate is bonded is conveyed from the nip portion by a plurality of conveying rollers. In addition, the said bonding process is performed twice, and the liquid crystal display device by which the polarizing plate was bonded on both surfaces of the liquid crystal panel is manufactured. After the liquid crystal display device is modularized, the liquid crystal display device is further subjected to various assembling processes to be a mobile device such as a notebook personal computer or a mobile phone, and various products (final products) such as a large television.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. Note that in this embodiment, the description of the same configuration as that described in the above embodiment is omitted.

  As shown in FIG. 2, the peeling device 21 according to the present embodiment includes a variable peeling roller 14 instead of the peeling roller 4 in the peeling device 20 according to the embodiment, and a variable guide instead of the guide roller 5. A roller 15 is provided. The other members constituting the peeling device 21 are the same as the members constituting the peeling device 20.

  The variable peeling roller 14 is arranged on the downstream side of the first nip portion 1 so as to come into contact with the heavy peeling film 32 side in the film laminate 30, and continuously peels the light peeling film 31 from the film laminate 30. It has a function to do. The variable peeling roller 14 is a non-driven conveying roller, and is formed of a soft material such as rubber or a hard material such as metal. Specific examples of the variable peeling roller 14 include known (general) rollers. The variable peeling roller 14 changes the transport direction of the heavy release film 32 with respect to the transport direction of the light release film 31. In other words, the heavy release film 32 in the film laminate 30 in contact with the variable peeling roller 14 is wound around the variable peeling roller 14 (along the variable peeling roller 14) and its conveyance direction (traveling direction) is changed and conveyed. On the other hand, the light release film 31 is transported without being wound around the variable release roller 14 (without changing the transport direction). Thereby, the variable peeling roller 14 is configured to continuously separate the film laminate 30 into a heavy release film 32 (a laminate of a heavy release film and an adhesive layer) and a light release film 31.

  The variable guide roller 15 is a non-driving roller, and is formed of a soft material such as rubber or a hard material such as metal. Specific examples of the variable guide roller 15 include known (general) rollers. The variable guide roller 15 is on the downstream side of the variable peeling roller 14 (downstream in the transport direction of the light release film 31) so as to contact the surface of the light release film 31 that has not been bonded to the adhesive layer. Has been placed. The variable guide roller 15 changes the transport direction of the light release film 31.

  Further, the variable peeling roller 14 and the variable guide roller 15 are movably provided in a casing (not shown) of the peeling device 21. Specifically, the variable peeling roller 14 and the variable guide roller 15 depend on the type of the film laminate 30, that is, the material, properties, thickness, etc. of the light release film 31, the adhesive layer and the heavy release film 32. In order to perform an optimal peeling operation according to various conditions, the angle θ of the heavy release film 32 in the transport direction with respect to the transport direction of the light release film 31 is, for example, preferably in the range of 35 ° or more and 180 ° or less. The arrangement can be changed (position can be moved) so that it can be arbitrarily changed within a range of preferably 60 ° or more and 120 ° or less. Therefore, the variable peeling roller 14 also has a function as a variable guide roller (also serves as).

  On the other hand, the guide rollers 6 and 7 are fixed to a casing (not shown) of the peeling device 21 and have a function as a fixed guide roller. That is, even if the arrangement direction of the variable peeling roller 14 and the variable guide roller 15 is changed (the position is moved), the conveyance direction of the light peeling film 31 from the variable guide roller 15 toward the guide roller 6 is changed. Since the arrangement (position) 6 is fixed and the positional relationship with the conveyance roller 8 does not change, the conveyance direction of the light release film 31 from the guide roller 6 toward the conveyance roller 8 can always be kept constant. Similarly, even if the transport direction of the heavy release film 32 from the variable release roller 14 toward the guide roller 7 is changed by changing the positions (moving positions) of the variable release roller 14 and the variable guide roller 15, the guide Since the arrangement (position) of the roller 7 is fixed and the positional relationship with the conveyance roller 9 does not change, the conveyance direction of the heavy release film 32 from the guide roller 7 toward the conveyance roller 9 can always be kept constant. .

  That is, in the peeling device 21 according to the present embodiment, the guide roller 6 that is a fixed guide roller is provided between the variable guide roller 15 and the conveyance roller 8. The direction of transport to go is kept constant. That is, the holding angle (described later) of the light release film 31 in the transport roller 8 can be kept constant. Therefore, the measurement of the tension of the light release film 31 by the measurement unit 10a provided on the transport roller 8 can be stably performed. Similarly, in the peeling device 21 according to the present embodiment, since the guide roller 7 that is a fixed guide roller is provided between the variable peeling roller 14 and the conveyance roller 9, the conveyance roller 9 of the heavy release film 32. The transport direction toward the head is kept constant. That is, the holding angle of the heavy release film 32 in the transport roller 9 can be kept constant. Therefore, the measurement of the tension of the heavy release film 32 by the measuring unit 10b provided on the transport roller 9 can be stably performed.

  A variable guide roller having the same configuration as the variable guide roller 15 may be further provided between the variable peeling roller 14 and the guide roller 7. In this case, the variable peeling roller 14 does not have (does not serve as) a function as a variable guide roller.

  In the present invention, the “holding angle” is a scale indicating how much the film (light release film 31, heavy release film 32) is wound around the transport rollers 8, 9. The angle when the transport direction (traveling direction) is changed by being transported while being in contact with (a value obtained by subtracting 180 ° when the transport direction is not changed is 180 °). Specifically, for example, when the film is wound around the transport rollers 8 and 9 by 1/6 turn, the transport direction is changed by 60 °, so the holding angle is 120 ° and the 1/4 turn Since the conveyance direction is changed by 90 ° in the case of winding, the holding angle is 90 °, and the conveyance direction is changed by 120 ° in the case of １ ／ winding, The hugging angle is 60 °, and when the wrapping is 1/2 turn, the conveyance direction is changed by 180 °, so that the hugging angle is 0 °.

  In the peeling device 21 according to the present embodiment, since the positional relationship between the guide roller 6, the transport roller 8, and the second nip portion 2 is always constant, the holding angle of the light release film 31 on the transport roller 8 is always constant. is there. Similarly, in the peeling device 21 according to the present embodiment, since the positional relationship among the guide roller 7, the transport roller 9, and the third nip portion 3 is always constant, the holding angle of the heavy release film 32 on the transport roller 9 is Always constant. Thus, even if the angle θ of the transport direction of the heavy release film 32 with respect to the transport direction of the light release film 31 is changed according to various conditions such as the material, properties, and thickness of the film laminate 30, the light release film 31 Since the tension of the heavy release film 32 can be stably measured, the tension of the light release film 31 and the heavy release film 32 to be conveyed can be controlled to be always constant.

  That is, according to the peeling device 21 configured as described above, even if the angle θ in the transport direction of the heavy release film 32 with respect to the transport direction of the light release film 31 is changed, the light peeling at the transport rollers 8 and 9 by the guide rollers 6 and 7 is performed. The holding angle of the film 31 and the heavy release film 32 can be made constant. That is, since the measurement conditions of the tension of the light release film 31 and the tension of the heavy release film 32 by the measurement units 10a and 10b can always be kept constant, the tension control by the control unit can be performed more stably. Therefore, according to the peeling device 21 having the above-described configuration, the angle of the transport direction of the heavy release film 32 with respect to the transport direction of the light release film 31 can be changed according to the type of the film laminate 30. The peeling apparatus which can peel the light peeling film 31 from 30 continuously more stably can be provided.

  Note that the present invention is not limited to the above-described embodiment, and can be implemented in a mode in which various modifications are made within the described range. Therefore, various modifications can be made within the scope of the claims. .

  According to the peeling method and the peeling apparatus according to the present invention, the tension of the light release film to be conveyed and the tension of the heavy release film are constant and do not fluctuate so that the pressure-sensitive adhesive layer does not remain on the light release film side. In addition, the light release film can be stably peeled off. Thereby, the effect that the peeling method and peeling apparatus which can peel the light peeling film continuously from a film laminated body stably so that an adhesive layer does not remain in the light peeling film side can be provided. Play.

  Therefore, the peeling method and the peeling apparatus according to the present invention are suitably used for manufacturing a liquid crystal display device in which polarizing plates are bonded to both surfaces of a liquid crystal panel, for example. After the liquid crystal display device is modularized, it undergoes various assembly processes and is widely used in various industries that manufacture mobile devices such as notebook personal computers and mobile phones, and various products (final products) such as large-sized televisions. Can be used.

DESCRIPTION OF SYMBOLS 1 1st nip part 2 2nd nip part 3 3rd nip part 4 Peeling roller 5 Guide roller 6 Guide roller (fixed guide roller)
7 Guide roller (fixed guide roller)
8 Conveying roller 9 Conveying roller 10a Measuring unit 10b Measuring unit 14 Variable peeling roller (variable guide roller)
15 Variable guide roller 20 Peeling device 21 Peeling device 30 Film laminate 31 Light release film 32 Heavy release film

Claims (10)

The pressure-sensitive adhesive layer, a long heavy release film, and a long light release film that can be peeled off from the pressure-sensitive adhesive layer with a smaller peeling force than the heavy release film. The method is a peeling method for continuously peeling a light release film using a peeling roller from the film laminate, while conveying a long film laminate formed by laminating a layer and a light release film in this order,
While controlling the tension of the light release film to be transported and the tension of the heavy release film to be constant, the light release film is transported from the transport direction of the film laminate without changing the transport direction. The peeling method characterized by changing the conveyance direction of the said heavy peeling film with respect to the conveyance direction of a peeling film along the said peeling roller. Furthermore, the conveyance direction of a light peeling film is changed along a guide roller , The peeling method of Claim 1 characterized by the above-mentioned.   The peeling method according to claim 1 or 2, wherein the tension of the light release film and the tension of the heavy release film to be conveyed are each controlled to 50 N or more.   The peeling method according to claim 1, 2 or 3, wherein the tension of the heavy release film conveyed is greater than or equal to the tension of the light release film.   The peeling method according to any one of claims 1 to 4, wherein an angle of the transport direction of the heavy release film with respect to the transport direction of the light release film is 35 ° or more and 180 ° or less.   The peeling method according to any one of claims 1 to 5, wherein an end surface in the width direction of the film laminate is a cut surface.   The peeling method according to any one of claims 1 to 6, wherein the film laminate has a width of 200 mm or more. The pressure-sensitive adhesive layer, a long heavy release film, and a long light release film that can be peeled off from the pressure-sensitive adhesive layer with a smaller peeling force than the heavy release film. While transporting a long film laminate formed by laminating a layer and a light release film in this order, the peeling device continuously peels the light release film from the film laminate,
While the light release film is transported from the transport direction of the film laminate without changing the transport direction, the release roller for changing the transport direction of the heavy release film relative to the transport direction of the light release film, and the tension of the light release film being transported And a control unit for controlling the tension of the heavy release film to be constant, and a measuring unit for measuring the tension of the light release film and the tension of the heavy release film.   The peeling apparatus according to claim 8, further comprising a variable guide roller that arbitrarily changes an angle of the transport direction of the heavy release film with respect to the transport direction of the light release film.   A light release film and a heavy release film are further provided with a transport roller for transporting the lightly peeled film and the heavy release film after peeling, and the measurement unit is provided on the transport roller, so that the holding angle of the transport roller is constant. The peeling apparatus according to claim 9, further comprising a fixed guide roller that adjusts the conveying direction of the sheet between the variable guide roller and the conveying roller.

Images