WO2016204093A1

WO2016204093A1 - Method for manufacturing laminated optical film, device for manufacturing laminated optical film, and method for peeling release film

Info

Publication number: WO2016204093A1
Application number: PCT/JP2016/067422
Authority: WO
Inventors: 勉古谷; 武藤　清; 祐二芹川
Original assignee: 住友化学株式会社
Priority date: 2015-06-16
Filing date: 2016-06-10
Publication date: 2016-12-22
Also published as: TW201702654A; JP2017007094A; CN107635764B; CN107635764A; JP6532767B2; TWI715592B

Abstract

The method for manufacturing a laminated optical film pertaining to an embodiment of the present invention is provided with a step for conveying an optical film so that the orientation of a first virtual plane P1 orthogonal to the width direction of an optical film 11 is constant, a step for conveying a protective film 13 so that a second virtual plane P2 orthogonal to the width direction of the protective film intersects with the first virtual plane, a step for changing the conveyance direction of the conveyed protective film so that the width direction of the protective film matches the direction normal to the first virtual plane, and a step for forming a laminated optical film 10 in which the protective film, the conveyance direction of which is changed, and the conveyed optical film are continuously laminated so that the longitudinal directions thereof match each other, and the optical film and the protective film are laminated.

Description

Manufacturing method of bonded optical film, manufacturing apparatus of bonded optical film, and peeling method of peeling film

This invention relates to the manufacturing method of a bonding optical film, and also relates to the manufacturing apparatus of a bonding optical film, and the peeling method of a peeling film.

As a bonding optical film, for example, a polarizing film that is an optical film, a protective film that protects the polarizing film, or a polarizing film that is an optical film or a retardation film for protecting it A film to which a protective film (for example, a protective film) is bonded is known.

Thus, when manufacturing a bonded optical film by laminating a protective film in the thickness direction of the optical film, the optical film conveying means and the protective film (for example, protective film) conveying means are arranged in parallel in the vertical direction. (See Patent Document 1). And it bonded, conveying the optical film and the protective film in the same direction, and manufactured the bonded optical film which bonded. For example, when the release film is peeled off from the optical film on which the release film is bonded, similarly, the transport means for the optical film and the transport means for the release film peeled from the optical film are arranged in parallel in the vertical direction. It was.

JP 2012-181276 A

However, in the prior art, when installing a device for manufacturing a laminated optical film or a device for peeling a release film from an optical film in a factory, the degree of freedom in the layout of the device is reduced, and the factory space is effectively utilized. There was something I couldn't do.

Therefore, the present invention aims to provide a technique capable of effectively utilizing factory space when laminating a plurality of films or when peeling a release film from an optical film on which a release film is bonded. And

The manufacturing method of the bonding optical film which concerns on 1 side of this invention is an optical film conveyance process which conveys a strip | belt-shaped optical film so that the direction of the 1st virtual plane orthogonal to the width direction of an optical film is constant. The belt-shaped protective film has been transported in the first protective film transporting step and the first protective film transporting step so that the second virtual plane orthogonal to the width direction of the protective film intersects the first virtual plane. The first protective film transport direction changing step and the first protective film transport direction changing step for changing the transport direction of the protective film so that the width direction of the protective film coincides with the normal direction of the first virtual plane. The protective film whose direction has been changed and the optical film that has been transported in the optical film transporting process are continuously bonded so that their longitudinal directions coincide with each other. Comprising a bonding step of forming a strip of bonding the optical film and is stuck film, a.

In the above manufacturing method, the belt-shaped optical film is transported so that the direction of the first virtual plane orthogonal to the width direction is constant. On the other hand, the belt-shaped protective film is transported so that the second virtual plane orthogonal to the width direction intersects the first virtual plane, and the transport direction of the transported protective film is the first in the width direction of the protective film. It changes so that it may correspond with the normal line direction of 1 virtual plane. Thereafter, the protective film and the optical film whose transport direction has been changed are continuously bonded so that their longitudinal directions coincide with each other, thereby forming a band-shaped bonded optical film in which the optical film and the protective film are bonded. is doing. Thus, since the direction of the conveyance direction of a protective film is changed, the freedom degree of the layout of the manufacturing apparatus at the time of manufacturing a bonding optical film becomes high. As a result, the factory space where the apparatus is installed can be used effectively.

In one embodiment, in the 1st protection film conveyance direction change process, it protects by winding a protection film on the roll rotated centering on the axis of the direction which intersects the width direction of the protection film in the 1st protection film conveyance process. You may change the conveyance direction of a film.

In one embodiment, in a 1st protection film conveyance process, a protection film is conveyed in the state where a strip-like exfoliation film is pasted to a protection film so that exfoliation is possible, and in a 1st protection film conveyance direction change process, it is on a protection film. You may change the conveyance direction of a protective film in the state in which the peeling film was bonded. Moreover, the width direction of a peeling film is the peeling process which peels a peeling film continuously from the protective film from which the conveyance direction was changed at the 1st protective film conveyance direction change process, and the peeling film peeled at the peeling process is 1st. In addition, the protective film from which the peeling film was peeled off may be bonded to the optical film in the bonding step so as to coincide with the normal direction of the 1 virtual plane.

In one embodiment, in the bonding step, the protective film is bonded to the optical film so that the release film is positioned on the side opposite to the optical film in a state where the strip-shaped release film is bonded in a peelable manner. And the bonding optical film conveyance process and the bonding optical film which convey the bonding optical film formed at the bonding process so that the width direction of the bonding optical film may correspond to the normal line direction of a 1st virtual plane. As for the peeling process which peels a peeling film from the bonding optical film currently conveyed by the conveyance process, and the peeling film peeled by the peeling process, the width direction of a peeling film corresponds with the normal line direction of a 1st virtual plane. And a release film transporting step for transporting to the substrate.

In the first protective film transport direction changing step, the release film is pasted on both sides of the protective film on a roll that rotates around an axis in a direction intersecting the width direction of the protective film in the first protective film transport step. You may change the conveyance direction of a protective film by winding so that the surface of the side by which it was joined will contact in the state in which the peeling film was bonded.

In this form, the transport direction of the protective film can be changed using a roll. A release film that is peeled off from the protective film is in contact with the roll. Therefore, even if a peeling film is damaged by a load or friction when changing the conveyance direction, the optical characteristics of the bonded optical film are not affected.

</ RTI> You may further have a peeling film conveyance direction change process which changes the conveyance direction of the peeling film conveyed by the said peeling film conveyance process to the direction which cross | intersects a 1st virtual plane.

In the release film transport direction changing step, the transport direction of the release film is changed by winding the release film around a roll that rotates around an axis that intersects the width direction of the release film in the release film transport step. Also good.

In the bonding process of one embodiment, the protective film may be bonded to the optical film so as to be peelable.

In this case, for example, when the optical film is bonded to another member or the like, the protective film can be peeled from the bonded optical film after the bonded optical film is bonded to the other member. Thereby, an optical film can be protected with a protective film until the optical film is bonded to another member or the like.

In one embodiment, in the bonding step, a belt-shaped second protective film different from the protective film may be bonded to the surface opposite to the surface on which the protective film is bonded to the optical film.

In one embodiment, in the bonding step, the protective film is bonded to the optical film in a peelable manner, and the second protective film in a band shape different from the protective film is bonded to the surface on which the protective film is bonded in the optical film. Is bonded to the opposite surface to obtain a bonded optical film in which the second protective film is bonded, and the width direction of the bonded optical film is the first virtual in the bonded optical film. It is peeled in the peeling process, the peeling process of peeling the protective film from the bonding optical film being transported in the bonding optical film transporting process, and the bonding optical film transporting process that is transported so as to coincide with the normal direction of the plane. You may further have the 2nd protective film conveyance process which conveys the protective film so that the width direction of a protective film may correspond with the normal line direction of a 1st virtual plane.

A second protective film transport direction changing step of changing the transport direction of the protective film transported in the second protective film transport step to a direction intersecting the first virtual plane may be further included.

In the second protective film transporting step, the transporting direction of the protective film is changed by winding the protective film around a roll that rotates around an axis that intersects the width direction of the protective film in the second protective film transporting step. May be.

The manufacturing method of the bonded optical film according to another aspect of the present invention includes an optical film transporting process for transporting the belt-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction of the optical film is constant, The protective film transporting step for transporting the strip-shaped protective film so that the width direction of the protective film coincides with the normal direction of the virtual plane in a state where the strip-shaped release film is detachably bonded. A peeling step for continuously peeling the film, and a peeling film carrying step for carrying the peeling film peeled in the peeling step so that the width direction of the peeling film coincides with the normal direction. In the peeling film conveyance direction changing step for changing the conveyance direction of the peeling film conveyed in step 1 to the direction intersecting the virtual plane, and carrying in the protective film conveyance step The protective film that has been transported and the optical film that has been transported in the optical film transporting process are bonded so that their longitudinal directions coincide with each other to form a band-shaped bonded optical film in which the optical film and the protective film are bonded. A pasting step, and the peeling step is performed before or after the pasting step.

In the above manufacturing method, the belt-shaped optical film is conveyed so that the orientation of the virtual plane orthogonal to the width direction is constant. Moreover, it conveys so that the width direction of a protective film may correspond with the normal line direction of a virtual plane in the state in which the strip | belt-shaped peeling film was bonded so that peeling was possible. The optical film and the protective film thus transported are bonded together. Before or after bonding of the optical film and the protective film, the release film is peeled from the protective film. Therefore, the bonded optical film to be manufactured is a film in which an optical film and a protective film are bonded and does not include a release film. In the said manufacturing method, the conveyance direction of the peeled peeling film is changed into the direction which cross | intersects the said virtual plane. Therefore, the freedom degree of the layout of the manufacturing apparatus at the time of manufacturing a bonding optical film becomes high. As a result, the factory space where the apparatus is installed can be used effectively.

In the embodiment in which the peeling step is performed before the bonding step, in the bonding step, the protective film after the peeling film is peeled off in the peeling step may be bonded to the optical film.

In the embodiment in which the peeling step is performed after the bonding step, in the bonding step, the protective film is bonded to the optical film in a state where the peeling film is bonded so that the peeling film is positioned on the opposite side of the optical film. In a peeling process, you may peel a peeling film from the bonding optical film formed at the bonding process.

In one embodiment, in the bonding step, a belt-shaped second protective film different from the protective film may be bonded to the surface opposite to the surface on which the protective film in the optical film is bonded.

The manufacturing method of the bonding optical film which concerns on the further another side surface of this invention is an optical film conveyance process which conveys a strip | belt-shaped optical film so that the direction of the virtual plane orthogonal to the width direction of an optical film is constant. The first release film transporting step for transporting the strip-shaped release film so that the width direction of the release film coincides with the normal direction of the virtual plane, and the width direction of the protection film is the normal line described above. The protective film transporting process to transport, the optical film, the release film, and the protective film are laminated so that the longitudinal directions of the optical film, the release film, and the protective film coincide with each other, and the optical film is sandwiched between the release film and the protective film The pasting process which forms a pasting optical film, and the pasting optical film formed at the pasting process, so that the width direction of a pasting optical film may correspond to the above-mentioned normal direction. The peeling optical film conveyance process to convey, the peeling process which peels a peeling film from the bonding optical film currently conveyed by the bonding optical film conveyance process, and the peeling film peeled by the peeling process are the width direction of a peeling film. 2nd peeling film conveyance process to convey, and the peeling film which changes the conveyance direction of the peeling film conveyed in the 2nd peeling film conveyance process to the direction which crosses a virtual plane so that may correspond to the above-mentioned normal line direction A transport direction changing step.

In the above manufacturing method, the belt-shaped optical film is conveyed so that the orientation of the virtual plane orthogonal to the width direction is constant. Moreover, a strip | belt-shaped peeling film and a protective film are conveyed so that those width directions may correspond with the normal line direction of a virtual plane. The optical film, the release film, and the protective film thus transported are bonded so that the protective film and the release film sandwich the optical film to form a bonded optical film. Then, a peeling film is peeled from the bonding optical film. Therefore, the bonding optical film by which the optical film and the protective film were bonded can be manufactured. In the said manufacturing method, after conveying the peeled peeling film so that the width direction may correspond with the said normal line direction, the conveyance direction of a peeling film is changed to the direction which cross | intersects the said virtual plane. Therefore, the freedom degree of the layout of the manufacturing apparatus at the time of manufacturing a bonding optical film becomes high. As a result, the factory space where the apparatus is installed can be used effectively.

The optical film may be a polarizing film obtained by subjecting a polyvinyl alcohol resin film to a stretching treatment and a crosslinking treatment.

A polarizing film that has been subjected to stretching treatment and crosslinking treatment tends to tear easily. When such a polarizing film is an optical film, if the conveyance direction of a polarizing film is changed, there exists a possibility that an optical film may be damaged by the influence at the time of the change. On the other hand, in the said manufacturing method, since the conveyance direction of a protective film or a peeling film is changed, the damage accompanying a conveyance direction change does not arise with respect to an optical film. Therefore, the said manufacturing method is still more effective when an optical film is the said polarizing film.

The manufacturing apparatus of the bonding optical film which concerns on the other side surface of this invention conveys a strip | belt-shaped optical film so that the direction of the 1st virtual plane orthogonal to the width direction of an optical film may be constant. The protective film transport unit and the protective film transport unit transported so that the second virtual plane perpendicular to the width direction of the protective film intersects the first virtual plane. Protection in which the transport direction is changed by the protective film transport direction changing unit and the protective film transport direction changing unit that changes the film transport direction so that the width direction of the protective film coincides with the normal direction of the first virtual plane. The optical film and the protective film are pasted together by continuously pasting the film and the optical film transported by the optical film transport unit so that their longitudinal directions coincide. Comprising a bonding unit to form a strip of bonding the optical film, the.

In the manufacturing apparatus, the optical film transport unit transports the belt-shaped optical film so that the orientation of the first virtual plane perpendicular to the width direction is constant. Moreover, a protective film conveyance part conveys a strip | belt-shaped protective film so that the 2nd virtual plane orthogonal to the width direction may cross | intersect a 1st virtual plane. The protective film conveyance direction changing unit changes the conveyance direction of the protective film that has been conveyed so that the width direction of the protective film coincides with the normal direction of the first virtual plane. And the bonding part is a strip-shaped paste in which the protective film and the optical film are continuously bonded so that the longitudinal directions of the protective film and the optical film coincide with each other, and the optical film and the protective film are bonded. A multi-optical film is formed. Thus, in the said manufacturing apparatus, since the direction of the conveyance direction of a protective film is changed, the freedom degree of the layout of the manufacturing apparatus at the time of manufacturing a bonding optical film becomes high. As a result, the factory space where the apparatus is installed can be used effectively.

The manufacturing apparatus of the bonding optical film which concerns on the other side surface of this invention is an optical film conveyance part which conveys a strip | belt-shaped optical film so that the direction of the virtual plane orthogonal to the width direction of the said optical film is constant. And a protective film transporting section for transporting the belt-shaped protective film so that the width direction of the protective film coincides with the normal direction of the virtual plane in a state where the strip-shaped peeling film is detachably bonded. A peeling part for continuously peeling the peeling film from the film, and a peeling film carrying part for carrying the peeling film peeled off at the peeling part so that the width direction of the peeling film coincides with the normal direction of the virtual surface. A release film transport direction changing unit that changes the transport direction of the release film that has been transported by the release film transport unit to a direction that intersects the virtual plane, and a protective film transport The optical film and the protective film are bonded together by bonding the protective film transported by the optical film and the optical film transported by the optical film transport unit so that their longitudinal directions coincide with each other. The bonding part which forms is provided.

In the manufacturing apparatus described above, the optical film transport unit transports the belt-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction is constant. Moreover, a protective film conveyance part conveys a strip | belt-shaped protective film so that the width direction of a protective film may correspond with the normal line direction of the said virtual plane in the state bonded by the strip | belt-shaped peeling film so that peeling was possible. Then, the optical film and the protective film are bonded so that the longitudinal direction of the protective film conveyed by the protective film conveying unit and the optical film conveyed by the optical film conveying unit coincide with each other. A band-shaped bonded optical film in which is bonded is formed. Since the said manufacturing apparatus has a peeling part, it can peel a peeling film continuously from a protective film. And a peeling film conveyance part conveys the peeled peeling film so that the width direction of a peeling film may correspond to the normal line direction of the said virtual plane. Then, a peeling film conveyance direction change part changes the conveyance direction of a peeling film so that it may cross | intersect the said virtual plane. Since a peeling film can be peeled from a protective film in a peeling part, the bonding optical film by which the optical film and the protective film were bonded can be manufactured. And the conveyance direction of the peeled peeling film is changed to the direction which cross | intersects the said virtual plane. Therefore, the freedom degree of the layout of the manufacturing apparatus at the time of manufacturing a bonding optical film becomes high. As a result, the factory space where the apparatus is installed can be used effectively.

An apparatus for manufacturing a bonded optical film according to still another aspect of the present invention includes an optical film transport unit that transports a belt-shaped optical film so that the orientation of a virtual plane orthogonal to the width direction of the optical film is constant. The strip-shaped release film is transported so that the width direction of the release film coincides with the normal direction of the virtual plane, and the width direction of the protection film is the above-described method. The protective film transport unit to be transported, and the optical film, the release film, and the protective film are laminated so that the longitudinal directions of the protective film transport unit, the optical film, the protective film, and the optical film are sandwiched between the protective film and the protective film. The pasting part that forms the pasting optical film and the pasting optical film formed at the pasting part are conveyed so that the width direction of the pasting optical film matches the normal direction. The width direction of the release film is the peeling optical film transporting part, the peeling part that peels the peeling film from the bonding optical film being transported by the bonding optical film transporting part, and the peeling film peeled off by the peeling part. The peeling film which changes the conveyance direction of the 2nd peeling film conveyance part conveyed and the peeling film conveyed by the 2nd peeling film conveyance part to the direction which cross | intersects the said virtual plane so that it may correspond with the said normal line direction. A conveyance direction changing unit.

In the manufacturing apparatus described above, the optical film transport unit transports the belt-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction is constant. A 1st peeling film conveyance part and a protective film conveyance part convey a peeling film and a protective film, respectively so that those width directions may correspond with the normal line direction of the said virtual plane. The optical film, the release film, and the protective film that have been transported in this way are bonded so that the protective film and the release film sandwich the optical film. Then, the peeling film by which the peeling part was bonded by the optical film is peeled from the optical film. Therefore, the bonding optical film by which the optical film and the protective film were bonded can be manufactured. In the said manufacturing apparatus, after conveying the conveyance direction of the peeling film from which the 2nd peeling film conveyance part peeled so that the width direction of a peeling film may correspond to the said normal line direction, a peeling film conveyance direction change part peels. The film transport direction is changed to a direction intersecting the virtual plane. Therefore, the freedom degree of the layout of the manufacturing apparatus at the time of manufacturing a bonding optical film becomes high. As a result, the factory space where the apparatus is installed can be used effectively.

The peeling method of the peeling film which concerns on the further another side surface of this invention is a method of peeling a peeling film from the optical film by which the strip | belt-shaped peeling film was bonded so that peeling was possible, and the optical film was made into the width direction of an optical film. An optical film transporting process for transporting the release film in a bonded state so that the orientation of the virtual plane orthogonal to the surface is constant, and a peeling process for peeling the release film from the optical film transported by the optical film transporting process And the release film transporting step for transporting the release film peeled in the release step so that the width direction of the release film matches the normal direction of the virtual plane, and the release film transported by the release film transporting step A release film transport direction changing step for changing the transport direction to a direction intersecting the virtual plane.

In the peeling method, after peeling the release film from the optical film on which the strip-like release film is peelably bonded, the transport direction of the release film is changed to a direction intersecting the virtual plane. Therefore, the freedom degree of the layout of the apparatus which peels a peeling film from the optical film with which the peeling film was bonded becomes high. As a result, the factory space where the apparatus is installed can be used effectively.

In one embodiment, a release film may be bonded to the optical film in a state where a band-shaped protective film is bonded in the optical film transporting process.

In one embodiment, in the release film transport direction changing step, the release film is wrapped around a roll that rotates around an axis in a direction intersecting the width direction of the release film in the release film transport step. May be changed.

According to the present invention, when a plurality of films are bonded, or when a release film is peeled off from an optical film on which a release film is bonded, a technology capable of effectively utilizing factory space can be provided.

Drawing 1 is a mimetic diagram showing the layer composition of the pasting optical film in a 1st embodiment. FIG. 2 is a schematic diagram showing a layer structure of a laminated protective film used for manufacturing the bonded optical film shown in FIG. FIG. 3 is a drawing for explaining a transport direction changing unit used for manufacturing the bonded optical film shown in FIG. 1. FIG. 4 is a drawing for explaining a method for producing the bonded optical film shown in FIG. 1. FIG. 5 is a drawing for explaining a method for producing the bonded optical film shown in FIG. 1. FIG. 6 is a drawing for explaining another example of the method for producing the bonded optical film shown in FIG. 1. FIG. 7 is a drawing for explaining still another example of the method for producing the bonded optical film shown in FIG. 1. Drawing 8 is a mimetic diagram showing the layer composition of the other example of the pasting optical film in a 1st embodiment. FIG. 9 is a drawing for explaining a method for producing the bonded optical film shown in FIG. 8. FIG. 10 is a schematic diagram illustrating a layer configuration of another example of the bonded optical film in the first embodiment. FIG. 11 is a drawing for explaining a method for producing the bonded optical film shown in FIG. 10. FIG. 12 is a drawing for explaining a method for producing the bonded optical film shown in FIG. 10. FIG. 13 is a schematic diagram illustrating a layer configuration of a bonded optical film in the second embodiment. FIG. 14 is a schematic diagram illustrating a layer structure of a laminated surface protective film used for manufacturing the bonded optical film illustrated in FIG. 13. FIG. 15 is a drawing for explaining a method for producing the bonded optical film shown in FIG. 13. FIG. 5 is a drawing for explaining a method for producing the bonded optical film shown in FIG. 13. FIG. 17 is a drawing for explaining another example of the method for producing the bonded optical film shown in FIG. 13. 18 is a drawing for explaining still another example of the method for producing the bonded optical film shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same symbols are assigned to the same elements. A duplicate description is omitted. The dimensional ratios in the drawings do not necessarily match those described. In the description, words indicating directions such as “up” and “down” are convenient words based on the state shown in the drawings.

(First embodiment)
As a first embodiment, a mode for producing a strip-shaped polarizing plate having a cross-sectional configuration schematically shown in FIG. 1 will be described. In the following description, “strip shape” means an elongated planar shape having a certain width when viewed in plan (when viewed from the thickness direction).

The polarizing plate 10 has a polarizing film 11 and

protective films

12 and 13. The polarizing plate 10 is a bonded optical film in which

protective films

12 and 13 are bonded to a polarizing film 11. An example of the width (length orthogonal to the thickness direction) of the polarizing plate 10 is 1000 mm or more, and an example of the length in the longitudinal direction is 500 m to 10000 m. An example of the thickness of the polarizing plate 10 is 10 μm or more and 200 μm or less. For example, the polarizing plate 10 is bonded to a liquid crystal cell to constitute a liquid crystal panel.

The polarizing film 11 is an optical film having linear polarization characteristics that selectively transmits light that vibrates in a predetermined direction. An example of the thickness of the polarizing film 11 is 5 μm to 30 μm. The polarizing film 11 is produced by performing a stretching process, a dyeing process, and a crosslinking process on the raw material film that becomes the polarizing film 11.

Examples of raw material films are polyvinyl alcohol (hereinafter sometimes referred to as “PVA”) resin films, polyvinyl acetate resin films, ethylene / vinyl acetate (hereinafter sometimes referred to as “EVA”) resin films, polyamide resin films. And a polyester resin film. Usually, a PVA-type resin film, especially a PVA film is used from a viewpoint of the adsorptivity and orientation of a dichroic dye. Unless otherwise specified, in the following description, the raw material film is a PVA film.

In the stretching process, the belt-shaped raw material film is uniaxially stretched in the longitudinal direction. The stretching method may be either a dry or wet stretching method. Examples of the draw ratio are 3 to 8 times. Uniaxial stretching of the raw material film can be performed before dyeing of the dichroic dye, simultaneously with dyeing, or after dyeing. When uniaxial stretching is performed after dyeing, this uniaxial stretching may be performed before or during the crosslinking treatment described later. Moreover, you may uniaxially stretch in these several steps. In the dyeing process, the raw material film is dyed with a dichroic dye. Examples of dichroic dyes used for dyeing include iodine and dichroic dyes. By the dyeing process, the dichroic dye is oriented and adsorbed in the stretching direction of the raw material film. As a result, the dyed raw material film has linear polarization characteristics. In the cross-linking process, the raw material film that has undergone the dyeing process is immersed in a cross-linking agent-containing aqueous solution for cross-linking. A suitable example of the cross-linking agent is boric acid, but other cross-linking agents such as boron compounds such as borax, glyoxal, and glutaraldehyde can also be used. This crosslinking treatment is a treatment for water resistance and hue adjustment (preventing bluish ting) by crosslinking.

The protective film (second protective film) 12 is a film for protecting the polarizing film 11. The protective film 12 is provided on one surface of the polarizing film 11 via an adhesive layer (not shown). The material of the resin film constituting the protective film 12 is, for example, a polyolefin resin such as a chain polyolefin resin (polypropylene resin or the like) or a cyclic polyolefin resin (norbornene resin or the like); triacetyl cellulose or diacetyl cellulose. Cellulose resins such as: Polyester resins such as polyethylene terephthalate and polybutylene terephthalate; Polycarbonate resins; (Meth) acrylic resins such as methyl methacrylate resins; Polystyrene resins; Polyvinyl chloride resins; Acrylonitrile Butadiene / styrene resin; Acrylonitrile / styrene resin; Polyvinyl acetate resin; Polyvinylidene chloride resin; Polyamide resin; Polyacetal resin; Modified polyphenylene ether resin; Sulfone-based resins; poly (ether sulfone) resins; polyarylate resin; polyamideimide resin; may be a polyimide resin or the like. The protective film 12 may be a protective film having an optical function such as a retardation film and a brightness enhancement film. An example of the thickness of the protective film 12 is 10 μm to 200 μm.

The protective film 13 is a film for protecting the polarizing film 11 similarly to the protective film 12. The protective film 13 is provided on the surface of the polarizing film 11 opposite to the surface on which the protective film 12 is provided via an adhesive layer (not shown). The example of the resin film which comprises the protective film 13 is the same as that of the protective film 12. The resin films constituting the

protective films

12 and 13 may be the same or different. An example of the thickness of the protective film 13 is the same as that of the protective film 12. The thickness of the protective film 13 may be the same as or different from the thickness of the protective film 12.

Next, a method for manufacturing the polarizing plate 10 will be described. The polarizing plate 10 is manufactured by bonding the band-shaped

protective films

12 and 13 to both surfaces of the band-shaped polarizing film 11 so that the longitudinal directions thereof coincide.

In the production of the polarizing plate 10, a strip-shaped laminated protective film 20 schematically shown in FIG. 2 is used. In FIG. 2, the cross-sectional structure (or laminated structure) orthogonal to the longitudinal direction of the laminated protective film 20 is typically shown. The laminated protective film 20 is a film in which a strip-shaped release film 21 is bonded to one side of the protective film 13 so as to be peelable so that their longitudinal directions coincide.

As the release film 21, for example, a self-adhesive resin film having adhesiveness alone can be used. The material of the self-adhesive resin film is polyethylene-based resin, polypropylene-based resin, polystyrene in that it is easy to handle, secures a certain degree of transparency, and is industrially mass-produced and inexpensive. It is preferable to use a polyethylene-based resin film, a polyethylene terephthalate-based resin, and the like. Among them, it is preferable to use a polyethylene-based resin film having relatively soft properties. Moreover, you may use the film which shape | molded these 1 type (s) or 2 or more types in the single layer or the multilayer form as a peelable film. An example of the thickness of the release film 21 is 5 μm to 200 μm, preferably 10 μm to 100 μm. Here, although the self-adhesive resin film was illustrated as the peeling film 21, the peeling film 21 may be a film having an adhesive layer.

In the manufacture of the polarizing plate 10, the transport direction changing section TB schematically shown in FIG. 3 is used. The transport direction changing unit TB is a member for changing the transport direction of the film F that has been transported in one direction. Specifically, the transport direction changing unit TB is a roll disposed on the transport path of the film F in a state where the rotation axis direction intersects the width direction of the film F. The width direction of the film F as a reference for the arrangement direction (direction of the rotation axis) of the transport direction changing unit TB is the width direction of the film F before entering the transport direction changing unit TB. The roll as the transport direction changing unit TB is known as a turn bar. FIG. 3 shows an example in which the width direction of the film F and the rotation axis of the transport direction changing unit TB intersect at about 45 °.

A conventionally well-known roll can be used for the conveyance direction change part TB which is a turn bar. Examples of the transport direction changing unit TB include a metal roll, a rubber roll, a sponge rubber roll, a resin roll, a carbon roll, and the like. Stainless steel and aluminum such as SUS304, SUS316 etc. as the material of the metal roll, silicone rubber, fluorine rubber, chlorobrene rubber, nitrile rubber etc. as the material of the rubber roll, chloroprene, ethylene propylene diene rubber etc. as the material of the sponge rubber roll, Examples of the material of the resin roll include fluororesin, and examples of the material of the carbon roll include carbon fiber reinforced plastic.

Metal rolls, rubber rolls, resin rolls, and carbon rolls were polished so that the maximum height of the roughness curve of JIS B 0601 (surface roughness) was 0.1 to 1.0 μm. A roll is preferred. A protective film such as chromium plating, nickel plating, diamond-like carbon, etc. may be formed on the outermost surface. Even when a protective film is formed on the outermost surface, the outermost surface is polished so that the maximum height of the roughness curve of JIS B 0601 (surface roughness) is 0.1 to 1.0 μm. Preferably it is.

When a rubber roll is used, its hardness is preferably about 60 to 90 degrees on the JIS Shore C scale measured by the test method of JIS K 6301.

When a sponge rubber roll is used, the hardness of the sponge is about 20 to 60 degrees, further about 25 to 50 degrees, and the density is about 0.4 to 0 on the JIS Shore C scale measured by the test method of JIS K 6301. 0.6 g / cm ³ , further about 0.42 to 0.57 g / cm ³ , and the maximum height of the roughness curve having a surface roughness of JIS B 0601 (surface roughness) is about 10 to 30 μm. preferable.

4 and FIG. 5, the manufacturing apparatus (manufacturing apparatus of a bonding optical film) 30 of the polarizing plate 10 will be described. FIG. 4 corresponds to the case where the manufacturing apparatus 30 is viewed from above. FIG. 5 corresponds to the drawing when the manufacturing apparatus 30 is viewed from the side.

The hatched part in FIG. 4 represents the protective film 12 conveyed from the upper direction to the lower direction in FIG. In FIG. 5, for convenience of explanation, the polarizing film 11, the protective film 12, and the laminated protective film 20 are illustrated with their thicknesses emphasized. The laminated protective film 20 has a laminated structure of the protective film 13 and the release film 21, but is schematically illustrated as a film having a certain thickness, and when the release film 21 is peeled off, the peeled peeled off is shown. The film 21 is indicated by a thick solid line.

For the sake of explanation, the vertical direction in FIG. 5 is also referred to as the vertical direction, and the direction orthogonal to the vertical direction is sometimes referred to as the horizontal direction. Also in the description of FIG. 4, the vertical direction and the horizontal direction may be used based on the correspondence with FIG.

As schematically shown in FIGS. 4 and 5, the manufacturing apparatus 30 includes a

film transport unit

31, 32, 33, 34, 35, 36, a transport direction changing unit TB 1, TB 2, a bonding unit 37, and a peeling unit 38. Is provided.

The film transport unit (optical film transport unit) 31 is a transport mechanism for transporting the polarizing film 11 in the longitudinal direction. The film transport unit 31 transports the polarizing film 11 toward the bonding unit 37.

The film transport unit 31 has a plurality of rolls 31a arranged so that the rotation axes are parallel to each other. The number of rolls 31a is not limited to the number shown in FIGS. The plurality of rolls 31 a are arranged so that the extending direction of their rotation axes coincides with the width direction of the polarizing film 11 (or is orthogonal to the longitudinal direction of the polarizing film 11). Thereby, the film conveyance part 31 conveys the polarizing film 11 so that the direction of the virtual plane (1st virtual plane) P1 orthogonal to the width direction of the polarizing film 11 becomes substantially constant. In other words, the film transport unit 31 transports the polarizing film 11 so that the normal direction of the virtual plane P 1 substantially matches the width direction of the polarizing film 11. In the form shown in FIG. 5, the polarizing film 11 is conveyed in the horizontal direction. 4 and 5, for the convenience of illustration, the virtual plane P1 is shown with a constant size, but the virtual plane P1 is a virtual infinite plane.

The film transport unit 32 is a transport mechanism for transporting the protective film 12 in the longitudinal direction. The film transport unit 32 transports the protective film 12 toward the bonding unit 37. The film transport unit 32 is disposed on one side of the polarizing film 11 that is transported by the film transport unit 31. In the form shown in FIG. 5, the film transport unit 32 is disposed above the polarizing film 11 in the vertical direction.

The film transport unit 32 has a plurality of rolls 32a arranged such that the rotation axes are parallel to each other. The number of rolls 32a is not limited to the number shown in FIGS. In the plurality of rolls 32a, the extending direction of their rotation axes substantially coincides with the width direction of the protective film 12 (or substantially perpendicular to the longitudinal direction of the protective film 12), and the rotation of the roll 31a. It is arranged substantially parallel to the extending direction of the shaft. Thereby, the film conveyance part 32 conveys the protective film 12 so that the width direction of the protective film 12 may correspond with the normal line direction of the virtual plane P1 substantially.

The film transport unit (protective film transport unit) 33 (see FIG. 4) is a transport mechanism for transporting the laminated protective film 20 in the longitudinal direction. The film transport unit 33 is disposed on the opposite side of the film transport unit 32 with respect to the polarizing film 11 transported by the film transport unit 31. 4 and 5, the film transport unit 33 is disposed below the polarizing film 11 in the vertical direction.

The film transport unit 33 includes a plurality of rolls 33a arranged so that the extending directions of the rotation shafts are parallel to each other. The number of rolls 33a is not limited to the number shown in FIG. The plurality of rolls 33a have their rotating shafts extending substantially in the width direction of the laminated protective film 20 (or substantially perpendicular to the longitudinal direction of the laminated protective film 20), and the rolls 31a It arrange | positions so that the extension direction of a rotating shaft may cross | intersect (orthogonal in the example of FIG. 4). Thereby, the film transport unit 33 has the laminated protective film such that the orientation of the virtual plane P2 orthogonal to the width direction of the laminated protective film 20 is substantially constant and the virtual plane P2 intersects the virtual plane P1. 20 is conveyed. In FIG. 4, for convenience of illustration, the virtual plane P2 is shown with a constant size. However, like the virtual plane P1, the virtual plane P2 is a virtual infinite plane.

The transport direction changing unit (protective film transport direction changing unit) TB1 is a roll (or a turn bar) that rotates around an axis that intersects the width direction of the laminated protective film 20 transported by the film transport unit 33. In other words, the transport direction changing unit TB1 is the transport direction changing unit TB when the film F of FIG. The transport direction changing unit TB1 changes the transport direction of the laminated protective film 20 that has been transported so that the width direction of the laminated protective film 20 substantially matches the normal direction of the virtual plane P1. FIG. 4 shows an example in which the width direction of the laminated protective film 20 before being wound around the transport direction changing portion TB1 and the rotation axis of the transport direction changing portion TB1 intersect at about 45 °. In addition, when winding the lamination | stacking protective film 20 around conveyance direction change part TB1, it is preferable that the lamination | stacking protection film 20 is wound so that the peeling film 21 may contact | connect the conveyance direction change part TB1.

The film transport unit 34 is a transport mechanism for transporting the laminated protective film 20 whose transport direction has been changed by the transport direction changing unit TB1 in the longitudinal direction. The film transport unit 34 is disposed on the opposite side of the film transport unit 32 with respect to the polarizing film 11 transported by the film transport unit 31. In the form illustrated in FIGS. 4 and 5, the film transport unit 34 is disposed below the polarizing film 11 in the vertical direction. The film transport unit 34 transports the laminated protective film 20 to the bonding unit 37 so that the protective film 13 is positioned on the polarizing film 11 side.

The film transport unit 34 has a plurality of rolls 34a in which the extending directions of the rotation shafts are arranged in parallel. The number of rolls 34a is not limited to the number shown in FIG. The plurality of rolls 34a have their rotating shafts extending in the direction substantially the same as the width direction of the laminated protective film 20 (or substantially perpendicular to the longitudinal direction of the laminated protective film 20). The rotating shaft is disposed substantially parallel to the extending direction. Thereby, the film conveyance part 34 conveys the lamination | stacking protection film 20 so that the width direction of the lamination | stacking protection film 20 may correspond with the normal line direction of the virtual plane P1 substantially.

The bonding part 37 has a pair of

rolls

37a and 37b for bonding the polarizing film 11, the protective film 12, and the laminated protective film 20. The pair of

rolls

37a and 37b are arranged such that their rotation axes are parallel to each other and parallel to the extending direction of the rotation axis of the roll 31a. The pair of

rolls

37 a and 37 b are arranged to face each other so as to sandwich the polarizing film 11 in the thickness direction of the polarizing film 11. The pair of

rolls

37a and 37b may be arranged so as to be separated to such an extent that a plurality of films fed between them can be pressed and bonded.

The bonding part 37 bonds the polarizing film 11, the protective film 12, and the laminated protective film 20 in the thickness direction by a pair of

rolls

37 a and 37 b, and continuously forms the belt-shaped laminated body 40. Form. The laminate 40 is a film in which the release film 21 is bonded to the polarizing plate 10 that is the bonded optical film shown in FIG.

The film conveyance part 35 is a conveyance mechanism for conveying the laminated body 40 sent out from the bonding part 37 to a longitudinal direction. The laminated body 40 includes the polarizing plate 10 that is a bonded optical film in the first embodiment. Therefore, the film conveyance part 35 is a bonding optical film conveyance part.

The film transport unit 35 has a plurality of rolls 35a in which the extending directions of the rotation shafts are arranged in parallel. The number of rolls 35a is not limited to the number shown in FIGS. In the plurality of rolls 35a, the extending direction of the rotation axes thereof substantially coincides with the width direction of the stacked body 40 (or substantially orthogonal to the longitudinal direction of the stacked body 40), and the rotation of the roll 31a. It is arranged substantially parallel to the extending direction of the shaft. Thereby, the film conveyance part 35 conveys the laminated body 40 so that the width direction of the laminated body 40 may correspond with the normal line direction of the virtual plane P1 substantially.

The peeling part 38 is a roll which peels the peeling film 21 from the laminated body 40. FIG. Such a roll is known as a release roll. The peeling part 38 is arrange | positioned so that the peeling film 21 may be contacted while being arrange | positioned downstream of the bonding part 37 in the conveyance direction of the laminated body 40. FIG.

The film transport unit (peeling film transport unit) 36 is a transport mechanism for transporting the release film 21 peeled by the peel unit 38 in the longitudinal direction. The film transport unit 36 includes a plurality of rolls 36a arranged so that the rotation axes are parallel to each other. The number of rolls 36a is not limited to the number shown in FIGS. In the plurality of rolls 36a, the extending direction of the rotation axis thereof substantially coincides with the width direction of the release film 21 (or is orthogonal to the longitudinal direction of the release film 21), and the extension axis of the roll 31a is extended. It is arranged substantially parallel to the direction. Thereby, the film conveyance part 36 conveys the peeling film 21 so that the width direction of the peeling film 21 may correspond with the normal line direction of the virtual plane P1 substantially.

The transport direction changing unit (peeling film transporting direction changing unit) TB2 is a roll (or a turn bar) that rotates around an axis that intersects the width direction of the peeling film 21 that is transported by the film transporting unit 36. In other words, the transport direction changing unit TB2 is the transport direction changing unit TB when the film F of FIG. The transport direction changing unit TB2 changes the transport direction of the release film 21 that has been transported by the film transport unit 36 to a direction that intersects the virtual plane P1 (orthogonal in FIG. 4). FIG. 4 shows an example in which the width direction of the release film 21 before being wound around the transport direction changing unit TB2 and the rotation axis of the transport direction changing unit TB2 intersect at about 45 °.

The manufacturing method of the polarizing plate using the manufacturing apparatus 30 is demonstrated. When manufacturing the polarizing plate 10, the polarizing film 11 which is an optical film is conveyed toward the bonding part 37 by the film conveyance part 31 (optical film conveyance process). The film transport unit 31 transports the polarizing film 11 so that the orientation of the virtual plane P1 orthogonal to the width direction of the polarizing film 11 is constant. In this case, as shown in FIG. 4, when the manufacturing apparatus 30 is viewed from above, the polarizing film 11 is conveyed in the A1 direction indicated by the white arrow.

The strip-shaped polarizing film 11 may be prepared as a raw fabric roll, or the polarizing film 11 produced by subjecting the raw material film to a stretching process, a dyeing process, and a crosslinking process may be continuously rolled up without being rolled up. You may supply. When the polarizing film 11 is prepared as an original roll, in the conveying process of the polarizing film 11, the polarizing film 11 is unwound from the original roll, and the film conveying unit 31 conveys the polarizing film 11 toward the bonding unit 37. . When the polarizing film 11 produced by subjecting the raw material film to the stretching process, the dyeing process, and the crosslinking process is continuously supplied without being rolled up, the polarizing film 11 obtained through each process is a film. Supplied to the transport unit 31 and transported toward the bonding unit 37. In the form shown in FIG. 5, the polarizing film 11 is conveyed in the horizontal direction, but if the orientation of the virtual plane P 1 orthogonal to the width direction of the polarizing film 11 is constant, the conveying path is conveyed in the horizontal direction. It is not limited to.

While transporting the polarizing film 11, the protective film 12 is transported toward the bonding unit 37 by the film transport unit 32. The film transport unit 32 transports the protective film 12 so that the width direction of the protective film 12 substantially matches the normal direction of the virtual plane P1. In the form shown in FIG. 5, the protective film 12 is conveyed by a plurality of rolls 32 a arranged above the polarizing film 11 in the vertical direction, and is bonded to the upper surface of the polarizing film 11. To be transported.

The belt-shaped protective film 12 is usually prepared as a raw roll. Therefore, in the transport process of the protective film 12, the protective film 12 is unwound from the raw roll, and the protective film 12 is transported toward the bonding unit 37 by the film transport unit 32.

The belt-shaped laminated protective film 20 is transported by the film transport unit 33 while transporting the polarizing film 11 and the protective film 12 toward the bonding unit 37 (first protective film transport process). The film transport unit 33 transports the laminated protective film 20 such that a virtual plane P2 orthogonal to the width direction of the laminated protective film 20 intersects the virtual plane P1 (orthogonal in FIG. 4). In this case, as shown in FIG. 4, when the manufacturing apparatus 30 is viewed from the upper side, the laminated protective film 20 is conveyed in the A2 direction indicated by the white arrow.

The strip-shaped laminated protective film 20 is usually prepared as a raw fabric roll. Therefore, in the conveyance process by the film conveyance part 33 of the lamination | stacking protective film 20, the lamination | stacking protection film 20 is drawn | fed out from an original fabric roll, and the lamination | stacking protection film 20 is conveyed by the film conveyance part 33. FIG.

The conveyance direction of the laminated protective film 20 conveyed by the film conveyance unit 33 is changed by the conveyance direction changing unit TB1 so that the width direction of the laminated protective film 20 matches the normal direction of the virtual plane P1 (first). Protective film conveyance direction changing step). That is, the conveyance direction of the laminated protective film 20 is changed from the A2 direction to the A1 direction. In the step of changing the transport direction of the laminated protective film 20, the laminated protective film 20 is wound around the transport direction changing unit TB1 so that the release film 21 of the laminated protective film 20 contacts the transport direction changing unit TB1. As a result, even if the release film 21 is damaged due to a load or friction caused by the transport direction changing unit TB1, the release film 21 is peeled off in a subsequent process, so that the optical characteristics of the polarizing plate 10 are not affected at all. .

The laminated protective film 20 whose transport direction has been changed is transported toward the bonding unit 37 by the film transport unit 34. The film transport unit 34 transports the laminated protective film 20 so that the width direction of the laminated protective film 20 substantially matches the normal direction of the virtual plane P1. The film transport unit 34 transports the laminated protective film 20 so that the laminated protective film 20 is fed into the bonding unit 37 in a state where the protective film 13 of the laminated protective film 20 is positioned on the polarizing film 11 side. In the form shown in FIG. 5, the laminated protective film 20 is fed into the bonding portion 37 so that the protective film 13 is in contact with the lower surface of the polarizing film 11.

In this way, the polarizing film 11, the protective film 12, and the laminated protective film 20 are continuously fed between the pair of

rolls

37a and 37b constituting the bonding portion 37 in a state in which the longitudinal directions thereof coincide with each other. .

When the polarizing film 11, the protective film 12, and the laminated protective film 20 are fed between the pair of

rolls

37a and 37b, the pair of

rolls

37a and 37b press the three films therebetween, and both surfaces of the polarizing film 11 The protective film 12 and the laminated protective film 20 are continuously bonded to each other (bonding step). Thereby, the strip | belt-shaped laminated body 40 containing the polarizing film 11, the protective film 12, and the laminated | stacked protective film 20 is formed.

The laminated protective film 20 is conveyed to the bonding part 37 so that the release film 21 is located on the opposite side to the polarizing film 11. Therefore, as described above, the laminate 40 formed by laminating the protective film 12 and the laminated protective film 20 on both surfaces of the polarizing film 11 has the release film 21 on the polarizing plate 10 which is a laminated optical film. It is what was pasted.

The polarizing film 11 and the protective film 12 may be bonded, for example, by applying an adhesive to at least one of the bonding surfaces in advance, or between the pair of

rolls

37a and 37b and the protective film 11 and the protective film 12. Before the film 12 is fed, an adhesive may be applied between them. As the adhesive, a water-based adhesive or an ultraviolet curable adhesive can be used. Moreover, you may use an adhesive instead of an adhesive agent. The same applies to the bonding of the polarizing film 11 and the laminated protective film 20.

When the laminated body 40 formed in the bonding part 37 is sent out from the bonding part 37, the film conveyance part 35 is such that the width direction of the laminated body 40 substantially matches the normal direction of the virtual plane P1. The laminated body 40 is conveyed (bonding optical film conveyance process). Thereby, as shown in FIG. 4, when the manufacturing apparatus 30 is seen from the upper side, the laminated body 40 is conveyed in the A1 direction shown by the white arrow.

Then, the peeling part 38 provided on the conveyance path of the film conveyance part 35 peels the peeling film 21 continuously from the laminated body 40 (peeling process). Thereby, the polarizing plate 10 which is a bonding optical film is obtained.

When the release film 21 is peeled from the laminate 40, the film transport unit 36 transports the release film 21 so that the width direction of the release film 21 substantially coincides with the normal direction of the virtual plane P1 (release film). Transport process).

The release film 21 that has been transported by the film transport unit 36 is changed by the transport direction changing unit TB2 so that the transport direction intersects the virtual plane P1 (peeling film transport direction changing step). Specifically, the conveyance direction of the release film 21 is changed so that a virtual plane orthogonal to the width direction of the release film 21 intersects (for example, orthogonal) with the virtual plane P1. FIG. 4 illustrates a mode in which the conveyance direction is changed in the direction of the white arrow A3. Thus, after the peeling film 21 by which the conveyance direction was changed was conveyed for a fixed distance, it is preferable to be wound up by a roll, for example.

In the manufacturing method of the polarizing plate 10, when the manufacturing apparatus 30 is viewed from the upper side, the protective film 12 and the laminated protective film 20 are bonded to form the laminated body 40 while the polarizing film 11 is conveyed in the A1 direction. While the laminated body 40 thus formed is further conveyed in the A1 direction, the release film 21 is continuously peeled to manufacture the polarizing plate 10.

In the manufacturing method of the polarizing plate 10, the conveyance direction of the laminated protective film 20 is further changed in the conveyance process until the laminated protective film 20 is sent to the bonding part 37. A specific description will be given using the A1 direction and the A2 direction shown in FIG.

As described above, the polarizing film 11 is conveyed in the A1 direction. On the other hand, the laminated protective film 20 is first transported in the A2 direction that intersects the A1 direction (orthogonal in FIG. 4). Thereafter, the transport direction of the laminated protective film 20 is changed to the A1 direction.

Since the polarizing plate 10 has a laminated structure, when the protective film 12, the polarizing film 11, and the laminated protective film 20 are bonded, they are laminated in the thickness direction. Therefore, in the form in which the transport direction of the laminated protective film 20 is the A1 direction from the beginning, the transport mechanism that transports them at least in the entire transport path to the bonding portion 37 of the polarizing film 11 and the laminated protective film 20 is vertical. It is necessary to form a multistage structure that overlaps each other in the direction.

In this case, the layout when the polarizing plate manufacturing apparatus is installed in the factory is substantially fixed, and the factory space cannot be used effectively. In addition, the work efficiency of the work for carrying the film over the transport roll or the like or the maintenance work is lowered. Further, an air cleaning device provided with an air filter (for example, a HEPA filter) for removing dust, dust and the like in the air with respect to the entire multi-stage structure in which the film transport mechanisms of the manufacturing apparatus are arranged in multi-stages. Will be installed. Therefore, dust and the like are difficult to remove in the lower film conveyance path, and defects due to dust and the like are likely to occur in the manufactured polarizing plate.

On the other hand, when changing the conveyance direction of the lamination | stacking protective film 20 in the middle of conveyance, as shown in FIG. 4, lamination | stacking protection from the horizontal direction (A2 direction) with respect to the conveyance direction (A1 direction) of the polarizing film 11 is carried out. The polarizing film 11 and the laminated protective film 20 can be laminated by carrying in the film 20. Therefore, the layout freedom when installing the manufacturing apparatus 30 in the factory is high, and the factory space can be used effectively.

Furthermore, in the process of transporting the polarizing film 11 and the laminated protective film 20, since a transport area where they do not overlap in the vertical direction can be formed, workability of the film transfer work or maintenance work is also improved. Therefore, the productivity of the polarizing plate 10 is also improved.

Moreover, in the conveyance process of the polarizing film 11 and the lamination | stacking protection film 20, since they can form the conveyance area | region which does not overlap in the perpendicular direction, an air purifier is installed with respect to each of the polarization film 11 and the lamination | stacking protection film 20, for example. It is possible. Therefore, dust is contained in the manufactured polarizing plate, or defects caused by the dust can be reduced. As a result, the manufacturing yield of the polarizing plate 10 is high, and the productivity of the polarizing plate 10 is also improved.

When the laminated protective film 20 is wound around the conveyance direction changing unit TB1 to change the conveyance direction, the laminated protective film 20 comes into contact with the conveyance direction changing unit TB1. Due to the load or friction associated with the direction change of the laminated protective film 20 by the transport direction changing unit TB1, scratches (eg, scratches) are likely to occur on the surface in contact with the transport direction changing unit TB1, but the transport direction changing unit TB1 The release film 21 is in contact. Since the release film 21 is a film that is peeled off at the release portion 38, even if the release film 21 is damaged due to a load or friction caused by the transport direction changing portion TB1, there is any influence on the optical characteristics of the polarizing plate 10. Does not occur. Therefore, the productivity of the polarizing plate 10 can be improved while improving the layout flexibility of the factory.

As described above, the polarizing film 11 is produced through a crosslinking step after being stretched in the stretching step in the production process. Thus, the polarizing film 11 produced including the extending | stretching process and the bridge | crosslinking process tends to tear easily in one direction. Therefore, for example, when the transport direction of the polarizing film is changed using the transport direction changing unit TB in order to improve the degree of freedom of layout in the factory, the polarizing film is easily damaged. On the other hand, in the said manufacturing apparatus 30 and the manufacturing method using the same, the conveyance direction of the laminated protective film 20 is changed. Therefore, productivity of the polarizing plate 10 can be improved while improving the degree of freedom of the factory layout.

In the manufacturing method of the polarizing plate 10 using the manufacturing apparatus 30, after peeling the peeling film 21 from the laminated body 40, the conveyance direction of the peeling film 21 is also changed. Specifically, the conveyance direction of the peeling film 21 is changed so as to proceed in the direction intersecting the virtual plane P1 in the course of the conveyance process of the peeling film 21 peeled from the laminate 40. In the form shown in FIG. 4, the transport direction of the release film 21 is changed in a direction substantially orthogonal to the transport direction of the polarizing film 11 and the laminate 40.

The release film 21 is a film that is finally disposed after being peeled from the laminate 40. However, it is necessary to apply tension to the release film 21 in order to release the release film 21 and to transport the release film 21 to a place where it is wound on a roll for disposal, for example. That is, a certain transport distance is generated due to the tension applied to the release film 21. Therefore, for example, if the transport direction of the laminate 40 and the transport direction of the release film 21 after peeling overlap in the vertical direction, the factory layout is fixed. On the other hand, when changing the conveyance direction of the peeling film 21 on the way, the freedom degree of the layout of the manufacturing apparatus 30 is high, and a factory space can be utilized further effectively.

When manufacturing a thin polarizing plate, the polarizing plate may be deformed due to the influence of the pressed state at the bonding portion 37 and become defective.

In contrast, in the first embodiment, the laminated protective film 20, the polarizing film 11, and the protective film 12 are bonded by the bonding unit 37. And the peeling film 21 is peeled from the laminated body 40 with which the polarizing film 11 and the laminated protective film 20 were bonded, and the polarizing plate 10 is obtained. The laminated protective film 20 is thicker than the protective film 13 because the release film 21 is bonded to the protective film 13. The release film 21 is peeled off from the laminate 40 after the laminate 40 is formed. Therefore, the thin polarizing plate 10 can be manufactured while suppressing the deformation of the polarizing plate 10 due to the bonding portion 37. Therefore, the productivity of the polarizing plate 10 can be improved.

1st Embodiment demonstrated above WHEREIN: The laminated body 40 containing the polarizing plate 10 which is a bonding optical film is also an optical film which the peeling film bonded. In this case, the process after being sent out from the bonding part 37 corresponds to a peeling method for peeling the release film from the optical film to which the release film 21 is bonded.

(Modification 1-1)
In the manufacturing method of the polarizing plate demonstrated using FIG.4 and FIG.5, after peeling the peeling film 21 from the laminated body 40, it had the process of changing the conveyance direction of the peeling film 21. FIG. However, this step may not be provided. That is, as illustrated in the manufacturing apparatus 30A illustrated in FIG. 6, the transport direction changing unit TB2 may not be provided. Even in this case, since the transport direction of the laminated protective film 20 is changed, the degree of freedom in layout when the manufacturing apparatus 30A is installed in a factory can be improved. Furthermore, the productivity of the polarizing plate 10 can be improved.

(Modification 1-2)
In the manufacturing method of the polarizing plate demonstrated using FIG.4 and FIG.5, it had the process of changing the conveyance direction of the laminated protective film 20. FIG. However, this step may not be provided. That is, unlike the manufacturing apparatus 30B illustrated in FIG. 7, the transport direction changing unit TB1 may not be provided, and the film transport unit 33 may not be provided. In this case, the laminated protective film 20 may be conveyed by the film conveying unit 34 so that the width direction of the laminated protective film 20 substantially coincides with the normal direction of the virtual plane P1. For example, when the laminated protective film 20 is prepared as an original fabric roll, the laminated protective film 20 fed out from the original fabric roll is conveyed by the film conveying unit 34. Also in Modification 1-2, since the conveyance direction of the release film 21 is changed, it is possible to improve the degree of freedom in layout when the manufacturing apparatus 30B is installed in a factory.

(Modification 1-3)
As shown in FIG. 1, the configuration of the polarizing plate is not limited to the form in which the

protective films

12 and 13 are bonded to both surfaces of the polarizing film 11, but the polarizing plate 10A shown in FIG. The protective film 13 may be bonded only to one side of the film 11. That is, the polarizing film 10 shown in FIG.

The polarizing plate 10A can be manufactured by, for example, the manufacturing apparatus 30C shown in FIG. The manufacturing apparatus 30 C is the same as the configuration of the manufacturing apparatus 30 except that the film transport unit 32 is not provided. The polarizing plate manufacturing method using the manufacturing apparatus 30 C is the same as the polarizing plate manufacturing method using the manufacturing apparatus 30 except that the manufacturing method of the polarizing plate 10 does not include the transporting process of the protective film 12. Since the transport process of the protective film 12 is not provided, in the bonding process by the bonding unit 37, the polarizing film 11 and the laminated protective film 20 are bonded to form a laminated body 40A. Then, in the peeling process by the peeling

part

38, 10 A of polarizing plates are formed by peeling the peeling film 21 from 40 A of laminated bodies.

In the manufacturing method described in Modification 1-3, the polarizing plate 10A in which the protective film 13 is provided only on one side of the polarizing film 11 is manufactured. Therefore, a thinner polarizing plate 10A can be manufactured than when protective films are provided on both sides of the polarizing film. Such a thin polarizing plate 10A can be suitably used for a thin liquid crystal display device, for example.

On the other hand, in Modified Example 1-3, the laminated protective film 20 and the polarizing film 11 are bonded by the bonding portion 37. And the peeling film 21 is peeled from the laminated body 40A by which the polarizing film 11 and the laminated protective film 20 were bonded, and 10 A of polarizing plates are obtained. The laminated protective film 20 is thicker than the protective film 13 because the release film 21 is bonded to the protective film 13. The release film 21 is peeled off from the laminate 40A after the laminate 40A is formed. Therefore, the thin polarizing plate 10A can be manufactured while suppressing deformation of the polarizing plate 10A by the bonding portion 37. Therefore, the manufacturing method of Modified Example 1-3 can improve the productivity of the polarizing plate 10 and contribute to the manufacture of a thin polarizing plate.

In the manufacturing method of the polarizing plate 10A in Modification 1-3, the points that the factory space can be effectively used, the workability is improved, and the productivity of the polarizing plate 10A is improved using FIGS. 4 and 5. As explained.

Also in this modified example 1-3, as in modified example 1-1, it is not necessary to include a step of changing the transport direction of the release film 21. Or similarly to the modified example 1-2, the process of changing the conveyance direction of the laminated protective film 20 may not be provided.

(Modification 1-4)
Contrary to the modified example 1-3, the polarizing plate may have a configuration in which the protective film 12 is bonded to the polarizing film 11 as in the polarizing plate 10B shown in FIG. In order to explain the difference in the manufacturing process, the polarizing plate 10A and the polarizing plate 10B are described separately, but the polarizing plate 10A and the polarizing plate 10B are substantially the same.

The polarizing plate 10B can be manufactured by the manufacturing apparatus 30D shown in FIGS. 11 and 12, for example. The configuration of the manufacturing apparatus 30D is the same as that of the manufacturing apparatus 30A. However, the manufacturing method using the manufacturing apparatus 30 D is different from the manufacturing method of the polarizing plate 10 in that a strip-shaped protective film 13 to which a release film is not bonded is used instead of the strip-shaped laminated protective film 20.

Due to this difference, in the polarizing plate manufacturing method using the manufacturing apparatus 30D, the film transport unit 33 transports the protective film 13, the transport direction changing unit TB1 changes the transport direction of the protective film 13, and the film The transport unit 34 also transports the protective film 13. And the bonding part 37 bonds the protective film 12, the polarizing film 11, and the protective film 13, and forms the laminated body 40B. In the bonding step by the bonding unit 37, the protective film 13 is bonded to the polarizing film 11 so as to be peelable, thereby forming a laminate 40B. This may be achieved by adjusting the adhesive force of the adhesive used for bonding the polarizing film 11 and the protective film 13. Moreover, you may use the surface protective film (protective film) which has an adhesive on the side bonded with the polarizing film 11 as the protective film 13. FIG.

Then, the peeling part 38 peels the protective film 13 from the laminated body 40B, the film conveyance part 36 conveys the peeled protective film 13, and the conveyance direction change part TB2 further changes the conveyance direction of the protective film 13. . In this manufacturing method, the polarizing plate 10B is obtained by peeling the protective film 13 from the laminate 40B. The hatching part of FIG. 12 shows the protective film 13 after the transport direction is changed by the transport direction changing unit TB2.

Since the film transport unit 33 is also transporting the protective film 13, the transport process of the protective film 13 by the film transport unit 36 can be regarded as a second protective film transport process. Similarly, since the transport direction changing unit TB1 also changes the transport direction of the protective film 13, the step of changing the transport direction of the protective film 13 by the transport direction changing unit TB2 can be regarded as a second protective film transport direction changing step. .

Since the polarizing film 11 and the protective film 12 are thin, for example, if only these two films are to be bonded, the pressing force of the pair of

rolls

37a and 37b is applied as in the case of Modification 1-3. The polarizing plate formed by the deformation may be deformed and a defect due to the deformation may occur.

On the other hand, when manufacturing the polarizing plate 10B with manufacturing apparatus 30D, since the protective film 13 is also bonded together, the protective film 13 is the reinforcement at the time of bonding the polarizing film 11 and the protective film 12 together. It functions as a film for. Therefore, when the polarizing film 11 and the protective film 12 are bonded and the laminated body 40B is formed, a deformation | transformation etc. are hard to produce in the polarizing plate 10B which comprises some laminated bodies 40B.

Moreover, after forming the laminated body 40B, the protective film 13 is peeled from the laminated body 40B. Therefore, the manufactured polarizing plate 10 B has the configuration shown in FIG. 10, and can be made thinner than when the protective film is bonded to both surfaces of the polarizing film 11. That is, in the manufacturing method described in Modification 1-4, it is possible to manufacture a thin polarizing plate 10B while suppressing deformation of the polarizing plate 10B by the bonding portion 37. In other words, the manufacturing method of Modified Example 1-4 can improve the productivity of the polarizing plate 10 and contribute to the manufacture of a thin polarizing plate.

Also in Modification 1-4, the transport direction of the protective film 13 to be finally peeled is changed before the bonding step in the bonding unit 37. Therefore, as in the case of the manufacturing method of the polarizing plate 10, the degree of freedom in layout when the manufacturing apparatus 30D is installed in a factory is improved. Furthermore, even if the protective film 13 is damaged by the transport direction changing unit TB1, the optical characteristics of the polarizing plate 10B are not affected at all, so that the production efficiency of the polarizing plate 10B is improved. Furthermore, since the conveyance direction of the protective film 13 peeled from the laminated body 40B is changed in the middle after the bonding step, the degree of freedom in layout when the manufacturing apparatus 30D is installed in the factory is improved in this respect as well. ing.

As described above, in Modification 1-4, the protective film 13 is peeled from the laminated body 40B, and thus the protective film 13 can be regarded as a kind of peeled film. Therefore, for example, the release film 21 may be used instead of the protective film 13.

Also in Modification 1-4, as in Modification 1-1, it is not necessary to include a step of changing the transport direction of the peeled protective film 13 after bonding. Or similarly to the modification 1-2, it is not necessary to provide the process of changing the conveyance direction of the protective film 13 before bonding.

(Modification 1-5)
In the modified example 1-4, the release film 21 is used instead of the protective film 13 and, similarly to the modified example 1-2, the form in which the transport direction of the peeled film 21 is not changed before the bonding is modified 1- This will be described as 5.

In this case, the release film 21 is transported by the film transport unit 34 so that the width direction of the release film 21 substantially coincides with the normal direction of the virtual plane P1. Therefore, the film conveyance part 34 functions as a 1st peeling film conveyance part which conveys the peeling film 21, and the conveyance process of the peeling film 21 by the film conveyance part 34 can be considered as a 1st peeling film conveyance process. Moreover, the film conveyance part 36 functions as a 2nd peeling film conveyance part which conveys the peeled peeling film, and the conveyance process of the peeling film 21 by the film conveyance part 36 can be regarded as a 2nd peeling film conveyance process. Furthermore, the conveyance direction change part TB2 functions as a conveyance direction change part of the peeling film 21, as described in FIGS. 4 and 5, and the process of changing the conveyance direction of the release film 21 by the conveyance direction change part TB2 This can be regarded as a release film conveyance direction changing step.

Modification 1-5 corresponds to the modification 1-4 in which the release film 21 is used instead of the protective film 13 and the transport direction of the release film 21 is not changed before bonding. It has the same effect as Example 1-4.

(Second Embodiment)
As a second embodiment, a mode for producing a strip-shaped polarizing plate 50 with a surface protective film having a cross-sectional configuration schematically shown in FIG. 13 will be described. The polarizing plate 50 with a surface protective film comprises a liquid crystal panel by being bonded by a liquid crystal cell, for example.

The polarizing plate 50 with a surface protective film is a bonded optical film provided with a polarizing plate 51 and a surface protective film (protect film) 52 as shown in FIG. Examples of the length in the width direction and the length in the longitudinal direction of the band-shaped polarizing plate 50 with a surface protective film may be the same as those of the polarizing plate 10. An example of the thickness of the polarizing plate 50 with a surface protective film is 50 to 300 μm.

The polarizing plate 51 is an optical film according to the second embodiment having linear polarization characteristics. The polarizing plate 51 may be the

polarizing plates

10, 10A, and 10B manufactured in the first embodiment.

The surface protective film 52 is a self-adhesive resin film having adhesiveness alone, a film having the adhesive layer 53 formed on one side, and the like, and is detachably bonded to the polarizing plate 51. FIG. 13 shows a surface protective film having an adhesive layer 53 formed on one side. An example of the thickness of the surface protective film 52 may be the same as that of the

protective films

12 and 13. Examples of the material of the surface protective film 52 are polyethylene, polypropylene, polystyrene, and polyester. The surface protective film 52 is a film that may be peeled off from the polarizing plate 50 with the surface protective film when the liquid crystal cell or the like to which the polarizing plate 50 with the surface protective film is bonded is marketed as a liquid crystal display device. .

An example of the thickness of the pressure-sensitive adhesive layer 53 is 5 μm to 30 μm. The example of the adhesive which comprises the adhesive layer 53 contains an acrylic adhesive, an epoxy adhesive, a urethane adhesive, and a silicone adhesive.

In the following description, an adhesive layer 53 is formed on one surface of the surface protective film 52 unless otherwise specified. When the surface protective film 52 is peeled from the polarizing plate 50 with the surface protective film, the pressure-sensitive adhesive layer 53 is also peeled together. Therefore, in the following description, the surface protective film 52 on which the pressure-sensitive adhesive layer 53 is formed is also referred to as a surface protective film 54. In addition, the surface protection film 52 in which the adhesive layer 53 is formed on one side is also a kind of release film with an adhesive layer.

Next, the manufacturing method of the polarizing plate 50 with a surface protective film will be described. The polarizing plate 50 with a surface protective film is manufactured by laminating the belt-shaped surface protective film 54 on one side of the belt-shaped polarizing plate 51 so that the longitudinal direction thereof coincides.

In the production of the polarizing plate 50 with a surface protective film, a strip-shaped laminated surface protective film 60 schematically shown in FIG. 14 is used. FIG. 14 schematically shows a cross-sectional configuration (or a laminated structure) orthogonal to the longitudinal direction of the laminated surface protective film 60. The laminated surface protective film 60 includes a surface protective film 54 and a strip-shaped release film 61.

The release film 61 is a film that is detachably bonded to the surface protective film 54. The release film 61 is bonded to the pressure-sensitive adhesive layer 53 in the surface protective film 54 as shown in FIG. An example of the release film 61 may be the same as that of the release film 21.

The manufacturing apparatus 70 of the polarizing plate 50 with a surface protective film is demonstrated using FIG.15 and FIG.16. FIG. 15 corresponds to the case where the manufacturing apparatus 70 for the polarizing plate 50 with a surface protective film is viewed from above. FIG. 16 corresponds to the case where the manufacturing apparatus 70 is viewed from the side.

In FIG. 16, for the convenience of explanation, the polarizing plate 51 and the laminated surface protective film 60 are illustrated with their thicknesses emphasized. The laminated surface protective film 60 has a laminated structure of the surface protective film 54 and the release film 61, but is schematically illustrated as a film having a certain thickness, and when the release film 61 is peeled off, the peeled off film 61 is peeled off. The peeled film 61 is indicated by a thick solid line. For the sake of explanation, in FIG. 16, the vertical direction is also referred to as the vertical direction, and the direction orthogonal to the vertical direction may be referred to as the horizontal direction. Also in the description of FIG. 15, the vertical direction and the horizontal direction may be used based on the correspondence relationship with FIG. 16.

As schematically shown in FIGS. 15 and 16, the manufacturing apparatus 70 includes

film transport units

71, 72, 73, 74, 75, a transport direction changing unit TB 3, TB 4, a peeling unit 76 and a bonding unit 77. .

The film transport unit (optical film transport unit) 71 is a transport mechanism for transporting the polarizing plate 51 in the longitudinal direction. The film transport unit 71 transports the polarizing plate 51 toward the bonding unit 77.

The film transport unit 71 has a plurality of rolls 71a arranged so that the rotation axes are parallel to each other. The number of rolls 71a is not limited to the number shown in FIGS. The plurality of rolls 71 a are arranged so that the extending direction of their rotation axes substantially coincides with the width direction of the polarizing plate 51 (or is orthogonal to the longitudinal direction of the polarizing plate 51). Accordingly, the film transport unit 71 transports the polarizing plate 51 so that the orientation of the virtual plane (first virtual plane) P3 orthogonal to the width direction of the polarizing plate 51 is constant. In other words, the film transport unit 71 transports the polarizing plate 51 such that the normal direction of the virtual plane P3 substantially matches the width direction of the polarizing plate 51. In FIG. 15 and FIG. 16, for the sake of illustration, the virtual plane P 3 is shown with a constant size, but the virtual plane P 3 is a virtual infinite plane.

The film transport unit (protective film transport unit) 72 (see FIG. 15) is a transport mechanism for transporting the laminated surface protective film 60 in the longitudinal direction. The film transport unit 72 includes a plurality of rolls 72a arranged so that the extending directions of the rotation shafts are parallel to each other. The number of rolls 72a is not limited to the number shown in FIG.

In the plurality of rolls 72a, the extending direction of their rotation axes substantially coincides with the width direction of the laminated surface protective film 60 (or is orthogonal to the longitudinal direction of the laminated surface protective film 60), and the rotation of the roll 71a. It arrange | positions so that the extension direction of an axis | shaft may cross | intersect (orthogonal in the example of FIG. 15). Thereby, the film conveyance part 72 is so that the direction of the virtual plane (2nd virtual plane) P4 orthogonal to the width direction of the lamination | stacking surface protection film 60 is constant, and the virtual plane P4 cross | intersects the virtual plane P3. The laminated surface protective film 60 is conveyed. In FIG. 15, for convenience of illustration, the virtual plane P4 is shown with a constant size, but the virtual plane P4 is a virtual infinite plane, like the virtual plane P3.

The transport direction changing section (protective film transport direction changing section) TB3 is a roll (or turn bar) that rotates around an axis that intersects the width direction of the laminated surface protective film 60 transported by the film transport section 72. . In other words, the transport direction changing unit TB3 is the transport direction changing unit TB when the film F of FIG. The transport direction changing unit TB3 changes the transport direction of the laminated surface protective film 60 that has been conveyed so that the width direction of the laminated surface protective film 60 substantially matches the normal direction of the virtual plane P3. FIG. 15 shows an example in which the width direction of the laminated surface protective film 60 before being wound around the transport direction changing unit TB3 and the rotation axis of the transport direction changing unit TB3 intersect at about 45 °. In addition, when winding the lamination | stacking surface protection film 60 around the conveyance direction change part TB3, it is preferable that the lamination | stacking surface protection film 60 is wound so that the peeling film 61 may contact | connect the conveyance direction change part TB3.

The film transport unit 73 is a transport mechanism for transporting the laminated surface protective film 60 whose transport direction has been changed by the transport direction changing unit TB3 in the longitudinal direction thereof. The film transport unit 73 has a plurality of rolls 73a in which the extending directions of the rotation shafts are arranged in parallel. The number of rolls 73a is not limited to the number shown in FIGS.

In the plurality of rolls 73a, the extending direction of their rotation axes substantially coincides with the width direction of the laminated surface protective film 60 (or is orthogonal to the longitudinal direction of the laminated surface protective film 60), and the rotation of the roll 71a. It is arranged substantially parallel to the extending direction of the shaft. Thereby, the film conveyance part 73 conveys the lamination | stacking surface protection film 60 so that the width direction of the lamination | stacking surface protection film 60 may correspond with the normal line direction of the virtual plane P3 substantially.

As will be described later, a peeling portion 76 is provided in the conveyance path of the laminated surface protective film 60 of the film conveying portion 73, and the peeling film 61 is peeled from the laminated surface protective film 60. Therefore, the laminated surface protective film 60 in which the release film 61 is peeled from the laminated surface protective film 60, that is, the surface protective film 54 is fed into the bonding unit 77 by the film transport unit 73.

The peeling part 76 is a roll which peels the peeling film 61 from the lamination | stacking surface protection film 60. FIG. Such a roll is known as a release roll. The peeling portion 76 is disposed so as to be in contact with the peeling film 61 in the process of transporting the laminated surface protective film 60.

The film transport unit (release film transport unit) 74 is a transport mechanism for transporting the release film 61 peeled by the peel unit 76 in the longitudinal direction. The film transport unit 74 has a plurality of rolls 74a arranged so that the rotation axes are parallel to each other. The number of rolls 74a is not limited to the number shown in FIGS.

In the plurality of rolls 74a, the extending direction of the rotation axis thereof substantially coincides with the width direction of the release film 61 (or is orthogonal to the longitudinal direction of the release film 61), and the extension axis of the roll 71a is extended. It is arranged substantially parallel to the direction. Thereby, the film conveyance part 74 conveys the peeling film 61 so that the width direction of the peeling film 61 may correspond with the normal line direction of the virtual plane P3 substantially.

The transport direction changing unit (peeling film transport direction changing unit) TB4 is a roll (or a turn bar) that rotates around an axis that intersects the width direction of the release film 61 by the film transport unit 74. In other words, the transport direction changing unit TB4 is the transport direction changing unit TB when the film F of FIG. The transport direction changing unit TB4 changes the transport direction of the peeled film 61 that has been transported so as to intersect the virtual plane P3. FIG. 15 shows an example in which the width direction of the release film 61 before being wound around the transport direction changing unit TB4 and the rotation axis of the transport direction changing unit TB4 intersect at about 45 °.

The laminating part 77 has a pair of

rolls

77a and 77b for laminating the polarizing plate 51 and the surface protective film 52. The pair of

rolls

77a and 77b are arranged such that their rotation axes are parallel to each other and parallel to the extending direction of the rotation axis of the roll 71a. The pair of

rolls

77 a and 77 b are arranged to face each other so as to sandwich the polarizing plate 51 in the thickness direction of the polarizing plate 51. The pair of

rolls

77a and 77b may be arranged so as to be separated to such an extent that a plurality of films fed between them can be pressed and bonded.

The bonding part 77 presses the polarizing plate 51 and the surface protective film 52 in the thickness direction by a pair of

rolls

77a and 77b, thereby bonding them together, and the polarizing plate 50 with a surface protective film which is a bonded optical film. Form.

The film conveyance part (bonding optical film conveyance part) 75 is a conveyance mechanism for conveying the polarizing plate 50 with the surface protective film sent out from the bonding part 77 in the longitudinal direction. The film transport unit 75 includes a plurality of rolls 75a arranged so that the extending directions of the rotation shafts are parallel to each other. The number of rolls 75a is not limited to the number shown in FIGS.

In the plurality of rolls 75a, the extending direction of their rotation axes substantially coincides with the width direction of the polarizing plate 50 with the surface protective film (or is orthogonal to the longitudinal direction of the polarizing plate 50 with the surface protective film). The roll 71a is disposed substantially parallel to the extending direction of the rotation axis. Thereby, the film conveyance part 75 conveys the polarizing plate 50 with a surface protection film so that the width direction of the polarizing plate 50 with a surface protection film may correspond substantially with the normal line direction of the virtual plane P3.

The manufacturing method of the polarizing plate with a surface protective film using the manufacturing apparatus 70 is demonstrated. When manufacturing the polarizing plate 50 with a surface protective film, the film conveyance part 71 conveys the polarizing plate 51 which is an optical film toward the bonding part 77 (optical film conveyance process). The film transport unit 71 transports the polarizing plate 51 so that the orientation of the virtual plane P3 orthogonal to the width direction of the polarizing plate 51 is constant. In this case, as shown in FIG. 15, when the manufacturing apparatus 70 is viewed from above, the polarizing plate 51 is conveyed in the A4 direction indicated by the white arrow.

When the strip-shaped polarizing plate 51 is the

polarizing plate

10, 10A, 10B described in the first embodiment, the film transport unit 71 is manufactured using the

polarizing plate

10, 10A, 10B in the first embodiment. It may be the same transport mechanism as the transport mechanism that transports them. Alternatively, when the polarizing plate 51 is prepared as an original roll, in the conveying process of the polarizing plate 51, the polarizing plate 51 is unwound from the original roll, and the film conveying unit 71 transfers the polarizing plate 51 to the bonding unit 77. Transport toward.

As shown in FIG. 16, the transport path of the polarizing plate 51 is not particularly limited as long as the orientation of the virtual plane P3 orthogonal to the width direction of the polarizing plate 51 is transported to be constant.

While the polarizing plate 51 is being conveyed, the film-shaped transport surface 72 conveys the belt-shaped laminated surface protective film 60 (first protective film conveying step). The film transport unit 72 transports the laminated surface protective film 60 so that a virtual plane P4 orthogonal to the width direction of the laminated surface protective film 60 intersects the virtual plane P3 (orthogonal in FIG. 15). In this case, as shown in FIG. 15, when the manufacturing apparatus 70 is viewed from the upper side, the laminated surface protective film 60 is conveyed in the A5 direction indicated by the white arrow.

The strip-shaped laminated surface protective film 60 is usually prepared as a raw roll. Therefore, in the step of transporting the laminated surface protective film 60 by the film conveying unit 72, the laminated surface protective film 60 is fed out from the raw roll, and the laminated surface protective film 60 is conveyed by the film conveying unit 72.

The conveyance direction of the laminated surface protective film 60 that has been conveyed by the film conveying unit 72 is changed by the conveyance direction changing unit TB3 so that the width direction of the laminated surface protective film 60 matches the normal direction of the virtual plane P3 ( 1st protective film conveyance direction change process). In the step of changing the transport direction of the laminated surface protective film 60, the laminated surface protective film 60 is wound around the transport direction changing unit TB3 so that the release film 61 of the laminated surface protective film 60 contacts the transport direction changing unit TB3. deep. As a result, even if the release film 61 is damaged due to a load or friction caused by the transport direction changing unit TB3, the release film 61 is peeled off in a later step, so that there is no optical characteristic of the polarizing plate 50 with a surface protective film. There is no impact.

The laminated surface protective film 60 whose conveyance direction has been changed is conveyed by the film conveyance unit 73 toward the bonding unit 77. The film transport unit 73 transports the laminated surface protective film 60 so that the width direction of the laminated surface protective film 60 substantially coincides with the normal direction of the virtual plane P3.

In this conveyance process, the peeling film 61 is continuously peeled from the laminated surface protective film 60 by the peeling portion 76 (peeling step). Therefore, in the conveyance process of the film conveyance part 73, after the peeling process by the peeling part 76 was implemented, the surface protection film 54, ie, the surface protection film in which the adhesive layer 53 was formed in the single side | surface by the film conveyance part 73. 52 is conveyed.

The film conveyance part 73 conveys the surface protection film 54 toward the bonding part 77 so that the adhesive layer 53 is located on the polarizing plate 51 side. Moreover, when the surface protection film 54 is sent into the bonding part 77, the film conveyance part 73 is surface-protected so that the longitudinal direction of the polarizing plate 51 and the surface protection film 54 may coincide, and those conveyance directions may correspond. The film 54 is conveyed. In FIG. 16, the surface protective film 54 is conveyed to the bonding unit 77 so that the pressure-sensitive adhesive layer 53 contacts the lower surface of the polarizing plate 51.

When the peeling film 61 is peeled from the laminated surface protective film 60, the peeling film 61 is transported by the film transport unit 74 so that the width direction of the peeling film 61 substantially coincides with the normal direction of the virtual plane P3.

The peeling film 61 conveyed by the film conveyance unit 74 is changed by the conveyance direction changing unit TB4 so that the conveyance direction intersects the virtual plane P3. Specifically, the conveyance direction of the release film 61 is changed so that a virtual plane orthogonal to the width direction of the release film 61 intersects (for example, orthogonal) with the virtual plane P3. In FIG. 15, the transport direction of the release film 61 is changed in the direction of the white arrow A6. Thus, it is preferable that the peeling film 61 by which the conveyance direction was changed is wound up by the roll, for example after being conveyed by a fixed distance.

The pair of

rolls

77a and 77b constituting the bonding unit 77 presses the polarizing plate 51 and the surface protective film 52 that have been continuously fed between them, thereby sticking the surface protective film 54 to the polarizing plate 51. Combine (bonding process). Thereby, the polarizing plate 50 with a surface protective film in which the polarizing plate 51 and the surface protective film 52 are bonded via the adhesive layer 53 is formed.

The manufactured polarizing plate 50 with a surface protective film is transported by the film transport unit 75 so that the width direction of the polarizing plate 50 with the surface protective film substantially matches the normal direction of the virtual plane P3. The polarizing plate 50 with a surface protective film conveyed by the film conveyance part 75 is strip | belt shape. Therefore, the polarizing plate 50 with a surface protective film transported by the film transport unit 75 may be wound around a roll. Alternatively, a step of processing (for example, cutting) the strip-shaped polarizing plate 50 with a surface protective film into a desired size may be performed.

In the manufacturing method of the polarizing plate 50 with the surface protective film using the manufacturing apparatus 70, as shown in FIG. 15, when the manufacturing apparatus 70 is viewed from the upper side, the polarizing plate 51 and the polarizing plate 51 are transported in the A4 direction. The surface protective film 54 is bonded and the polarizing plate 50 with a surface protective film is formed. In the manufacturing method of the polarizing plate 50 with a surface protective film, the conveyance direction of the laminated surface protective film 60 including the surface protective film 54 is further changed in the conveyance process until the surface protective film 54 is sent to the bonding portion 77. . A specific description will be given using the A4 direction and the A5 direction shown in FIG.

As described above, the polarizing plate 51 is conveyed in the A4 direction. On the other hand, the laminated surface protective film 60 is first transported in the A5 direction that intersects the A4 direction (orthogonal in FIG. 15). Thereafter, the transport direction of the laminated surface protective film 60 is changed so that the width direction of the laminated surface protective film 60 is orthogonal to the virtual plane P3.

Therefore, the manufacturing method of the polarizing plate 50 with the surface protective film using the manufacturing apparatus 70 has at least the same effects as the manufacturing method of the polarizing plate 10 using the manufacturing apparatus 30 of the first embodiment. That is, the layout of the manufacturing apparatus 70 is highly flexible, and the factory space where the manufacturing apparatus 70 is installed can be used effectively. Moreover, workability | operativity is good and the improvement of productivity of the polarizing plate 50 with a surface protective film can also be aimed at.

When the laminated surface protective film 60 is wound around the transport direction changing unit TB3 to change the transport direction, the release film 61 is in contact with the transport direction changing unit TB3. Therefore, in the case of 1st Embodiment, it has the same effect as the case where the peeling film 21 is wound around conveyance direction change part TB1.

Moreover, in the manufacturing method of the polarizing plate 50 with the surface protective film using the manufacturing apparatus 70, after peeling the peeling film 61 from the lamination | stacking surface protective film 60, the conveyance direction of the peeling film 61 is also changed. Therefore, in the first embodiment, as in the case where the transport direction of the peeled release film 21 is changed, the degree of freedom of the layout of the manufacturing apparatus 70 is further increased, and the factory space can be used more effectively. .

(Modification 2-1)
In the manufacturing method of the polarizing plate demonstrated using FIG.15 and FIG.16, after peeling the peeling film 61 from the lamination | stacking surface protection film 60, it had the process of changing the conveyance direction of the peeling film 61. FIG. However, this step may not be provided. That is, unlike the manufacturing apparatus 70A illustrated in FIG. 17, the transport direction changing unit TB4 may not be provided. Even in this case, since the transport direction of the laminated surface protective film 60 is changed, the degree of freedom in layout when the manufacturing apparatus 70A is installed in a factory can be improved. Furthermore, the productivity of the polarizing plate 50 with a surface protective film can be improved.

(Modification 2-2)
In the manufacturing method of the polarizing plate demonstrated using FIG.15 and FIG.16, it had the process of changing the conveyance direction of the lamination | stacking surface protection film 60. FIG. However, this step may not be provided. That is, unlike the manufacturing apparatus 70B shown in FIG. 18, the transport direction changing unit TB3 may not be provided, and the film transport unit 72 may not be provided. In this case, the laminated surface protective film 60 may be conveyed by the film conveying unit 73 so that the width direction of the laminated surface protective film 60 substantially matches the normal direction of the virtual plane P3. For example, when the laminated surface protective film 60 is prepared as an original fabric roll, the laminated surface protective film 60 fed out from the original fabric roll is conveyed by the film conveying unit 73. Also in Modification 2-2, since the conveyance direction of the release film 61 is changed, it is possible to improve the degree of freedom of layout when the manufacturing apparatus 70B is installed in a factory.

In the description of the second embodiment and the modifications thereof so far, the surface protective film for protecting the surface of the polarizing plate is exemplified as the protective film. However, for example, the protective film pastes the polarizing plate with the surface protective film to the liquid crystal cell in the form of forming the pressure-sensitive adhesive layer on one side of the polarizing plate when the polarizing plate with the surface protective film is bonded to the liquid crystal cell. Until then, a protective film (so-called non-carrier film) for preventing dust and the like from adhering to the pressure-sensitive adhesive layer may be used. This respond | corresponds to the form by which the surface protection film 52 is bonded with the adhesive layer 53 so that peeling is possible, for example.

Further, in the description of the second embodiment and the modifications thereof, the optical film is not limited to the polarizing plate. For example, the optical film may be a retardation film. In this case, the bonded optical film is a retardation plate.

While various embodiments and modifications of the present invention have been described above, the present invention is not limited to the various embodiments and modifications illustrated, but is shown by the claims and claims. It is intended that all changes within the meaning and scope equivalent to are included.

DESCRIPTION OF

SYMBOLS

10, 10A, 10B ... Polarizing plate (bonding optical film), 11 ... Polarizing film (optical film), 12 ... Protective film (2nd protective film), 13 ... Protective film, 20 ... Laminated protective film (peeling film) Protective film bonded so as to be peelable), 21 ... peeling film, 30, 30A, 30B, 30C, 30D ... manufacturing apparatus (manufacturing apparatus for bonded optical film), 31 ... film transport section (optical film transport section), 33 ... Film transport section (protective film transport section), 34 ... Film transport section (first release film transport section), 35 ... Film transport section (bonding optical film transport section), 36 ... Film transport section (release film transport section) , 2nd peeling film conveyance part), 37 ... bonding part, 38 ... peeling part, 50 ... polarizing plate with surface protection film (bonding optical film), 51 ... polarizing plate Optical film), 52... Surface protective film (protective film), 54... Surface protective film (protective film), 60... Laminated surface protective film (protective film on which the release film is peeled and bonded) 61. 70, 70A, 70B ... manufacturing apparatus (manufacturing apparatus for bonded optical film), 71 ... film transport section (optical film transport section), 72 ... film transport section (protective film transport section), 74 ... film transport section (release film) Transport unit), 75 ... Film transport unit (bonding optical film transport unit), 76 ... Peeling unit, 77 ... Bonding unit, P1 ... Virtual plane (first virtual plane), P2 ... Virtual plane (second virtual plane) , P3 ... virtual plane (first virtual plane), P4 ... virtual plane (second virtual plane), TB1 ... transport direction changing unit (protective film transport direction changing unit), TB2 ... transport direction changing Part (release film transporting direction changing portion), TB3 ... conveying direction changing unit (protective film transporting direction changing portion), TB4 ... conveying direction changing unit (release film transporting direction changing portion).

Claims

An optical film transporting step for transporting the belt-shaped optical film so that the orientation of the first virtual plane orthogonal to the width direction of the optical film is constant;
A first protective film transporting step for transporting the belt-shaped protective film so that a second virtual plane orthogonal to the width direction of the protective film intersects the first virtual plane;
The 1st protective film conveyance direction which changes the conveyance direction of the said protective film conveyed in the said 1st protective film conveyance process so that the width direction of the said protective film may correspond with the normal line direction of the said 1st virtual plane. Change process,
The protective film whose transport direction has been changed in the first protective film transport direction changing step and the optical film that has been transported in the optical film transport step are continuously bonded so that their longitudinal directions coincide with each other. A bonding step of forming a band-shaped bonding optical film in which the optical film and the protective film are bonded;
A method for producing a bonded optical film.
In the first protective film conveying direction changing step, the protection is performed by winding the protective film around a roll that rotates around an axis in a direction intersecting the width direction of the protective film in the first protective film conveying step. Change the film transport direction,
The manufacturing method of the bonding optical film of Claim 1.
In the first protective film transporting step, the protective film is transported in a state where a strip-shaped release film is detachably bonded to the protective film, and in the first protective film transporting direction changing step, the protective film is applied to the protective film. Changing the transport direction of the protective film in a state where the release film is bonded;
The manufacturing method of the bonding optical film of Claim 1 or 2.
In the first protective film conveyance direction changing step, the roll that rotates around the axis in the direction intersecting the width direction of the protective film in the first protective film conveyance step is peeled from both surfaces of the protective film. The manufacturing method of the bonding optical film of Claim 3 which changes the conveyance direction of the said protective film by winding so that the surface by which the film was bonded may contact in the state in which the peeling film was bonded. .
A peeling step of continuously peeling the release film from the protective film whose transport direction has been changed in the first protective film transport direction changing step;
A release film transporting step for transporting the release film peeled in the release step so that the width direction of the release film matches the normal direction of the first virtual plane;
Further comprising
In the bonding step, the protective film from which the release film has been peeled is bonded to the optical film.
The manufacturing method of the bonding optical film of Claim 3 or 4.
In the bonding step, the protective film is bonded to the optical film so that the release film is positioned on the side opposite to the optical film in a state where the strip-shaped release film is bonded in a peelable manner. Together
A bonding optical film conveying step of conveying the bonding optical film formed in the bonding step so that the width direction of the bonding optical film coincides with the normal direction of the first virtual plane;
A peeling step of peeling the release film from the bonding optical film being conveyed in the bonding optical film conveyance step;
A release film transporting step for transporting the release film peeled in the release step so that the width direction of the release film matches the normal direction of the first virtual plane;
Further having
The method for producing a laminated optical film according to any one of claims 1 to 4.
It further includes a release film transport direction changing step for changing the transport direction of the release film that has been transported in the release film transport step to a direction that intersects the first virtual plane.
The manufacturing method of the bonding optical film of Claim 5 or 6.
In the release film transport direction changing step, the release film is wrapped around a roll that rotates around an axis that intersects the width direction of the release film in the release film transport step. Change
The manufacturing method of the bonding optical film of Claim 7.
The method for producing a bonded optical film according to any one of claims 1 to 8, wherein, in the bonding step, the protective film is bonded to the optical film in a peelable manner.
In the bonding step, the second protective film having a band shape different from the protective film is bonded to the surface opposite to the surface on which the protective film is bonded to the optical film,
The method for producing a laminated optical film according to any one of claims 1 to 9.
In the said bonding process, while bonding the said protective film to the said optical film so that peeling is possible, the surface on which the said protective film is bonded in the said optical film for the strip | belt-shaped 2nd protective film different from the said protective film. By sticking on the opposite side to the above, the bonded optical film in a state where the second protective film is bonded is obtained,
A bonding optical film transporting step for transporting the obtained bonding optical film so that the width direction of the bonding optical film matches the normal direction of the first virtual plane;
A peeling step of peeling the protective film from the bonding optical film being conveyed in the bonding optical film conveyance step;
A second protective film conveying step for conveying the protective film peeled in the peeling step so that the width direction of the protective film coincides with the normal direction of the first virtual plane;
Further having
The manufacturing method of the bonding optical film of Claim 1 or 2.
A second protective film transport direction changing step of changing the transport direction of the protective film transported in the second protective film transport step to a direction intersecting the first virtual plane;
The manufacturing method of the bonding optical film of Claim 11.
In the second protective film conveying step, the protective film is wound around a roll that rotates around an axis in a direction intersecting the width direction of the protective film in the second protective film conveying step. Change the transport direction,
The manufacturing method of the bonding optical film of Claim 12.
An optical film transporting step for transporting the belt-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction of the optical film is constant;
A protective film transporting step for transporting the belt-shaped protective film so that the width direction of the protective film coincides with the normal direction of the virtual plane in a state where the strip-shaped release film is detachably bonded;
A peeling step for continuously peeling the release film from the protective film;
A release film transporting step for transporting the release film peeled in the release step so that the width direction of the release film matches the normal direction of the virtual plane;
Release film transport direction changing step for changing the transport direction of the release film that has been transported in the release film transport process to a direction that intersects the virtual plane,
The protective film transported in the protective film transporting process and the optical film transported in the optical film transporting process are bonded so that their longitudinal directions coincide with each other. A bonding step of forming a bonded band-shaped bonding optical film;
With
The peeling step is performed before or after the bonding step.
The manufacturing method of a bonding optical film.
The peeling step is carried out before the pasting step,
In the said bonding process, the said protective film after the said peeling film was peeled by the said peeling process is bonded to the said optical film,
The manufacturing method of the bonding optical film of Claim 14.
The peeling step is performed after the pasting step,
In the bonding step, the protective film is bonded to the optical film in a state where the release film is bonded so that the release film is positioned on the opposite side of the optical film,
In the peeling step, the peeling film is peeled off from the bonding optical film formed in the bonding step.
The manufacturing method of the bonding optical film of Claim 14.
In the release film transport direction changing step, the release film is wrapped around a roll that rotates around an axis that intersects the width direction of the release film in the release film transport step. Change
The method for producing a laminated optical film according to any one of claims 14 to 16.
The method for producing a bonded optical film according to any one of claims 14 to 17, wherein in the bonding step, the protective film is bonded to the optical film in a peelable manner.
In the bonding step, the second protective film in a band shape different from the protective film is bonded to the surface opposite to the surface on which the protective film is bonded to the optical film,
The method for producing a laminated optical film according to any one of claims 14 to 18.
An optical film transporting step for transporting the belt-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction of the optical film is constant;
A first release film transporting step for transporting the strip-shaped release film so that the width direction of the release film matches the normal direction of the virtual plane;
A protective film transporting step for transporting the belt-shaped protective film so that the width direction of the protective film coincides with the normal direction;
The optical film, the release film, and the protective film are bonded together so that their longitudinal directions coincide with each other, and the optical film is sandwiched between the release film and the protective film to form a bonded optical film. Process,
A bonding optical film conveying step for conveying the bonding optical film formed in the bonding step such that the width direction of the bonding optical film coincides with the normal direction, and
A peeling step of peeling the release film from the bonding optical film being conveyed in the bonding optical film conveyance step;
A second release film transporting step for transporting the release film peeled in the release step so that the width direction of the release film matches the normal direction;
A release film transport direction changing step for changing the transport direction of the release film that has been transported in the second release film transport step to a direction that intersects the virtual plane;
A method for producing a bonded optical film.
The optical film is a polarizing film subjected to a stretching treatment and a crosslinking treatment on a polyvinyl alcohol-based resin film.
The method for producing a laminated optical film according to any one of claims 1 to 20.
An optical film transport unit that transports the band-shaped optical film so that the orientation of the first virtual plane orthogonal to the width direction of the optical film is constant;
A protective film transport unit for transporting the belt-shaped protective film so that a second virtual plane orthogonal to the width direction of the protective film intersects the first virtual plane;
A protective film transport direction changing unit that changes the transport direction of the protective film that has been transported in the protective film transport unit so that the width direction of the protective film matches the normal direction of the virtual plane;
The protective film whose transport direction has been changed by the protective film transport direction changing unit and the optical film that has been transported by the optical film transport unit are continuously bonded so that their longitudinal directions coincide with each other. A bonding part for forming a band-shaped bonding optical film in which the optical film and the protective film are bonded;
The manufacturing apparatus of the bonding optical film provided with.
An optical film transport unit that transports the belt-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction of the optical film is constant;
A protective film transporting section for transporting the belt-shaped protective film so that the width direction of the protective film coincides with the normal direction of the virtual plane in a state in which the strip-shaped release film is detachably bonded;
A peeling portion for continuously peeling the release film from the protective film;
A release film transporting section for transporting the release film peeled off at the release section so that the width direction of the release film matches the normal direction of the virtual plane;
A release film transport direction changing unit that changes the transport direction of the release film that has been transported by the release film transport unit to a direction that intersects the virtual plane;
The protective film transported by the protective film transport unit and the optical film transported by the optical film transport unit are bonded so that their longitudinal directions coincide with each other. A bonding part for forming a bonded band-shaped bonding optical film; and
Comprising
Bonding optical film manufacturing equipment.
An optical film transport unit that transports the belt-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction of the optical film is constant;
A strip-shaped release film, a first release film transport unit that transports the release film so that the width direction of the release film matches the normal direction of the virtual plane;
A protective film transport unit for transporting the belt-shaped protective film so that the width direction of the protective film matches the normal direction;
The optical film, the release film, and the protective film are bonded together so that their longitudinal directions coincide with each other, and the optical film is sandwiched between the release film and the protective film to form a bonded optical film. And
A bonding optical film transport unit that transports the bonding optical film formed at the bonding unit such that the width direction of the bonding optical film coincides with the normal direction, and
A peeling unit for peeling the release film from the bonding optical film being conveyed in the bonding optical film conveyance unit;
A second release film transporting section that transports the release film peeled off at the release section so that the width direction of the release film matches the normal direction;
A release film transport direction changing unit that changes the transport direction of the release film that has been transported by the second release film transport unit to a direction that intersects the virtual plane;
Comprising
Bonding optical film manufacturing equipment.
It is a method of peeling the release film from an optical film that is peelably bonded to a strip-like release film,
An optical film transporting step for transporting the optical film in a state in which the release film is bonded so that the orientation of a virtual plane orthogonal to the width direction of the optical film is constant;
A peeling step of peeling the release film from the optical film that has been transported by the optical film transport step,
A release film transporting step for transporting the release film peeled in the release step so that the width direction of the release film matches the normal direction of the virtual plane;
A release film transport direction changing step for changing the transport direction of the release film that has been transported by the release film transport step to a direction that intersects the virtual plane;
Comprising
Release method of release film.
In the optical film conveying step, the release film is bonded to the optical film in a state where a band-shaped protective film is bonded.
The peeling method according to claim 25.
In the release film transport direction changing step, the release film is transported in the transport direction of the release film by winding the release film around a roll that rotates around an axis that intersects the width direction of the release film in the release film transport step. Change
The peeling method according to claim 25 or 26.