TW201702654A - Method for manufacturing laminated optical film, device for manufacturing laminated optical film, and method for peeling release film - Google Patents

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

The present invention relates to a method for producing a bonded optical film, and to a method for manufacturing a bonded optical film and a method for peeling off a release film.

As the bonded optical film, for example, a polarizing plate in which a protective film for protecting a polarizing film as an optical film is bonded to the polarizing film, or a protective layer for protecting a polarizing plate or a retardation film as an optical film is known. A film (for example, a pellicle film) is bonded to the film made of the polarizing plate or the retardation film.

When the protective film is bonded to the thickness direction of the optical film to produce the bonded optical film, the transport mechanism of the optical film transport mechanism and the protective film (for example, the protective film) is arranged in parallel in the vertical direction (refer to the patent document). 1). Further, the optical film and the protective film are conveyed in the same direction, and the optical film and the protective film are bonded to each other to produce a bonded optical film. In the case where the release film is peeled off from the optical film to which the release film is bonded, the transfer mechanism of the optical film and the transfer mechanism from which the release film is peeled off from the optical film are arranged in parallel in the vertical direction.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-181276

However, in the prior art, when a device for manufacturing an optical film or a device for peeling a release film from an optical film is installed in a factory, the degree of freedom in device layout is lowered, and the factory space may not be effectively utilized.

Accordingly, an object of the present invention is to provide a technique capable of effectively utilizing a factory space when a plurality of films are bonded or when an optical film to which a release film is bonded is peeled off from a release film.

A method for producing a bonded optical film according to an aspect of the present invention includes an optical film transfer step of transporting a strip-shaped optical film so that an orientation of a first virtual plane orthogonal to a width direction of the optical film is fixed; a protective film transporting step of transporting a strip-shaped protective film so that a second imaginary plane orthogonal to the width direction of the protective film intersects with the first imaginary plane; and a first protective film transporting direction changing step for protecting The direction in which the width direction of the film coincides with the normal direction of the first imaginary plane is changed in the direction in which the protective film is transported by the first protective film transport step, and the bonding step is carried out on the first protective film. In the direction change step, the protective film that changes the transport direction and the optical film that has been transported in the optical film transport step are continuously bonded so as to be aligned with each other in the longitudinal direction, thereby forming a film in which the optical film and the protective film are bonded together. The optical film is bonded to the shape.

In the above manufacturing method, the strip-shaped optical film is conveyed so that the orientation of the first virtual plane orthogonal to the width direction of the strip-shaped optical film is fixed. On the other hand, the strip-shaped protective film is conveyed so that the second imaginary plane orthogonal to the width direction of the strip-shaped protective film intersects the first imaginary plane, so that the width direction of the protective film and the first imaginary The direction in which the normal directions of the planes are aligned is changed, and the direction in which the protective film is transported is changed. Then, the protective film and the optical film in which the transport direction has been changed are continuously bonded so as to be aligned with each other in the longitudinal direction, thereby forming a strip-shaped bonded optical film in which an optical film and a protective film are bonded together. As described above, since the orientation of the protective film in the transport direction is changed, the degree of freedom in the layout of the manufacturing apparatus when the optical film is bonded is improved. As a result, it can be effectively flexible Use the factory space to set up the unit.

In the first protective film transport direction changing step, the protective film is wound around a roller that rotates around the axis to change the transport direction of the protective film, and the axis is (1) The axis in the direction in which the width direction of the protective film in the protective film transfer step intersects.

In the first protective film transport step, the protective film is transported while the strip-shaped release film is detachably attached to the protective film, and the first protective film transport direction changing step is performed. The transfer direction of the protective film is changed in a state where the release film is bonded to the protective film. Furthermore, the method further includes a peeling step of continuously peeling off the release film from the protective film in which the transport direction is changed in the first protective film transfer direction changing step, and a peeling film transport step for making the width direction of the release film The release film peeled off in the peeling step is conveyed so as to match the normal direction of the first imaginary plane; and in the bonding step, the protective film from which the release film has been peeled off is bonded to the optical film.

In one embodiment, in the bonding step, the protective film may be attached to the protective film in a state in which the strip-shaped release film is peelably adhered so that the release film is located on the opposite side of the optical film. In combination with the optical film, the method for producing the bonded optical film further includes a bonding optical film transfer step of transporting the bonded optical film so that the width direction of the bonded optical film matches the normal direction of the first virtual plane. a bonding optical film formed in the step; a peeling step of peeling off the release film from the bonded optical film conveyed by the bonding optical film transfer step; and a peeling film transporting step of making the width direction of the release film and the first The peeling film peeled off in the peeling step is conveyed in such a manner that the normal directions of the imaginary planes are uniform.

In the first protective film transport direction changing step, the protective film may be in a state in which the peeling film is bonded to the surface of the two surfaces of the protective film to which the release film is bonded, and The roller is wound around the shaft so as to be in contact with the roller, whereby the direction in which the protective film is conveyed is changed, and the axis is an axis intersecting the width direction of the protective film in the first protective film transfer step. .

In the above aspect, the conveyance direction of the protective film can be changed using a roller. The release film peeled off from the protective film is in contact with the roller. Therefore, even if the peeling film is damaged by the load or friction when the conveyance direction is changed, the optical characteristics of the bonded optical film are not affected.

Further, the peeling film transport direction changing step may be further included in which the transporting direction of the peeling film conveyed by the peeling film transporting step is changed to a direction intersecting the first virtual plane.

In the peeling film transport direction changing step, the peeling film is wound around a roller that is rotated about the axis to change the conveying direction of the peeling film, and the shaft is peeled off from the peeling film transporting step. The axis of the direction in which the width direction of the film intersects.

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

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

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

In one embodiment, the protective film may be adhered to the optical film in a peeling step, and the second protective film having a strip shape different from the protective film may be bonded to the optical film. The surface of the protective film is opposite to the surface of the protective film, whereby the bonded optical film is bonded to the second protective film, and the method for producing the bonded optical film further includes a bonding optical film transfer step for attaching The bonded optical film obtained by transporting the width direction of the optical film in conformity with the normal direction of the first imaginary plane; and the peeling step of peeling off the protective film from the bonded optical film conveyed by the bonded optical film transfer step And a second protective film transfer step of making the width direction of the protective film coincide with the normal direction of the first imaginary plane The protective film that was peeled off in the peeling step was transferred.

Further, the second protective film transfer direction changing step may be performed in the second protective film transfer direction changing step in which the transfer direction of the protective film transferred in the second protective film transfer step is changed to the direction intersecting the first virtual plane .

In the second protective film transfer step, the protective film is wound around a roller that is rotated about the axis to change the transport direction of the protective film, and the axis is in the second protective film transfer step. An axis in the direction in which the width direction of the protective film intersects.

A method of producing a bonded optical film according to another aspect of the present invention includes an optical film transfer step of transporting a strip-shaped optical film so that a direction perpendicular to a width direction of the optical film is fixed; and a protective film transporting a step of conveying a strip-shaped protective film such that the width direction of the protective film coincides with the normal direction of the imaginary plane in a state in which the strip-shaped release film is detachably bonded, and the peeling step continuously The release film is peeled off from the protective film, and the release film is conveyed in a peeling film which is peeled off in the peeling step so that the width direction of the release film matches the normal direction; and the peeling film transport direction changing step is to be peeled off The transport direction of the release film conveyed by the film transport step is changed to a direction intersecting the virtual plane, and the bonding step is to transfer the protective film to the protective film transport step so that the longitudinal directions thereof coincide with each other. And bonding the optical film conveyed by the optical film transfer step to form a strip-shaped bonded optical film in which an optical film and a protective film are bonded together, Step away before or after the bonding step.

In the above manufacturing method, the strip-shaped optical film is conveyed so that the orientation of the virtual plane orthogonal to the width direction of the strip-shaped optical film is fixed. In the state in which the strip-shaped release film is peelably adhered, the strip-shaped protective film is conveyed so that the width direction of the protective film coincides with the normal direction of the virtual plane. The optical film conveyed in the above manner is bonded to the protective film. The release film is peeled off from the protective film before or after the optical film is bonded to the protective film. Thereby, the bonded optical film produced is a film which bonded the optical film and the protective film, and does not contain a peeling film. In the above manufacturing method, the peeling film is transported after peeling The direction is changed to the direction intersecting the above imaginary plane. Thereby, the degree of freedom in the layout of the manufacturing apparatus when the optical film is bonded is improved. As a result, the factory space of the installation device can be effectively utilized.

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

In a form in which the peeling step is performed after the bonding step, the protective film may be bonded to the peeling film in a state in which the peeling film is placed on the opposite side of the optical film in the bonding step. In the optical film, in the peeling step, the release film is peeled off from the bonded optical film formed in the bonding step.

In the peeling film transport direction changing step, the transporting direction of the peeling film is changed by winding the peeling film around a roller that rotates around the axis, and the shaft is a peeling film in the peeling film transporting step. The axis in the direction in which the width direction intersects.

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

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

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

A method for producing a bonded optical film according to another aspect of the present invention includes an optical film transfer step of transporting a strip-shaped optical film so that an orientation of a virtual plane orthogonal to a width direction of the optical film is fixed; a peeling film transporting step of transporting a strip-shaped release film such that a width direction of the release film coincides with a normal direction of the virtual plane; and a protective film transfer step of making the width direction of the protective film coincide with the normal direction A method of conveying a strip-shaped protective film; a bonding step of making the length direction of each other uniform and using a peeling film and protection The optical film, the release film, and the protective film are bonded to each other to form a bonded optical film, and the bonded optical film is transported so that the width direction of the bonded optical film matches the normal direction. The method of conveying the bonded optical film formed in the bonding step, the peeling step of peeling off the release film from the bonded optical film conveyed by the bonded optical film transfer step, and the second peeling film transporting step of the peeling film The release film that is peeled off in the peeling step is conveyed in a manner that the width direction is aligned with the normal direction, and the peeling film transport direction changing step is changed to assuming that the transfer direction of the release film is conveyed in the second release film transfer step The direction of the plane crossing.

In the above manufacturing method, the strip-shaped optical film is conveyed so that the orientation of the virtual plane orthogonal to the width direction of the strip-shaped optical film is fixed. Further, the strip-shaped release film and the protective film are conveyed so that the width direction of the strip-shaped release film and the protective film coincide with the normal direction of the virtual plane. The optical film, the release film, and the protective film which were conveyed as described above were bonded together by the protective film and the peeling film, and the bonded optical film was formed. Thereafter, the release film was peeled off from the bonded optical film. Thereby, a bonded optical film in which an optical film and a protective film are bonded can be manufactured. In the above-described manufacturing method, the peeling film is conveyed so that the width direction of the peeling film after peeling coincides with the normal direction, and thereafter, the conveying direction of the peeling film is changed to a direction intersecting the virtual plane. Thereby, the degree of freedom in the layout of the manufacturing apparatus when the optical film is bonded is improved. As a result, the factory space of the installation device can be effectively utilized.

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

The polarizing film subjected to the stretching treatment and the crosslinking treatment tends to be easily cracked. When such a polarizing film is an optical film, if the direction in which the polarizing film is conveyed is changed, the optical film may be damaged by the influence of the change. On the other hand, in the above-described manufacturing method, since the conveyance direction of the protective film or the release film is changed, the optical film does not cause damage accompanying the change in the conveyance direction. Thereby, the above manufacturing method is for light It is more effective to learn that the film is the above polarizing film.

An apparatus for manufacturing a bonded optical film according to another aspect of the present invention includes: an optical film transporting unit that transports a strip-shaped optical film so that an orientation of a first imaginary plane orthogonal to a width direction of the optical film is fixed; The protective film transfer unit transports a strip-shaped protective film so that the second imaginary plane orthogonal to the width direction of the protective film intersects with the first imaginary plane, and the protective film transport direction changing unit such that the width of the protective film The conveying direction of the protective film conveyed by the protective film conveying unit is changed so that the direction coincides with the normal direction of the first imaginary plane, and the bonding portion is continuously continuous so that the longitudinal directions thereof coincide with each other. A protective film that has been changed by the protective film transport direction changing unit and an optical film that has been transported by the optical film transport unit are bonded to each other to form a strip-shaped bonded optical film in which an optical film and a protective film are bonded together. .

In the above-described manufacturing apparatus, the optical film transfer unit transports the strip-shaped optical film so that the orientation of the first virtual plane orthogonal to the width direction of the strip-shaped optical film is fixed. In addition, the protective film transport unit transports the strip-shaped protective film so that the second imaginary plane orthogonal to the width direction of the strip-shaped protective film intersects the first imaginary plane. The protective film transport direction changing unit changes the transport direction of the transported protective film so that the width direction of the protective film matches the normal direction of the first virtual plane. Then, the bonding portion continuously bonds the protective film having the changed conveying direction to the optical film so as to match the longitudinal direction of each other, thereby forming a strip-shaped bonding optical film in which the optical film and the protective film are bonded together. . As described above, in the above-described manufacturing apparatus, since the orientation of the protective film in the transport direction is changed, the degree of freedom in the layout of the manufacturing apparatus when the optical film is bonded is improved. As a result, the factory space of the installation device can be effectively utilized.

An apparatus for manufacturing a bonded optical film according to another aspect of the present invention includes: an optical film transporting unit that transports a strip-shaped optical film so that an orientation of a virtual plane orthogonal to a width direction of the optical film is fixed; a film transporting unit in which a strip-shaped peeling film is detachably bonded to a normal direction of the width direction of the protective film and the imaginary plane The strip-shaped protective film is conveyed in the same direction; the peeling portion continuously peels off the release film from the protective film; and the peeling film transporting portion is transported so that the width direction of the peeling film coincides with the normal direction of the virtual plane a release film that has been peeled off by the peeling portion; a peeling film transport direction changing unit that changes a transport direction of the release film conveyed by the release film transport unit to a direction intersecting the virtual plane; and a bonding portion that makes each other The protective film that has been transported by the protective film transport unit and the optical film that has been transported by the optical film transport unit are bonded to each other to form a strip-like patch in which the optical film and the protective film are bonded together. Optical film.

In the above-described manufacturing apparatus, the optical film transporting unit transports the strip-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction of the strip-shaped optical film is fixed. In the state in which the strip-shaped release film is adhered to the protective film, the protective film is conveyed so that the width direction of the protective film matches the normal direction of the virtual plane. Then, the bonding film is bonded to the optical film conveyed by the optical film conveying unit so that the protective film is conveyed so as to match the longitudinal direction of each other, thereby forming a bonding optical film and protecting A film-like bonded optical film. Since the above-described manufacturing apparatus has a peeling portion, the release film can be continuously peeled off from the protective film. Further, the release film conveying unit conveys the peeled film after peeling so that the width direction of the release film coincides with the normal direction of the virtual plane. Thereafter, the peeling film transport direction changing unit changes the transport direction of the release film so as to intersect the virtual plane. Since the peeling film can be peeled off from the protective film by the peeling part, the bonded optical film in which the optical film and the protective film are bonded together can be manufactured. Then, the conveyance direction of the peeling film after peeling is changed to the direction which cross|intersects the said virtual plane. Thereby, the degree of freedom in the layout of the manufacturing apparatus when the optical film is bonded is improved. As a result, the factory space of the installation device can be effectively utilized.

An apparatus for manufacturing a bonded optical film according to another aspect of the present invention includes an optical film transporting unit that transports a strip-shaped optical film so that an orientation of a virtual plane orthogonal to a width direction of the optical film is fixed; a peeling film conveying portion for making the width direction of the peeling film and the upper side The strip-shaped release film is conveyed in such a manner that the normal direction of the imaginary plane is uniform; the protective film transporting unit transports the strip-shaped protective film such that the width direction of the protective film matches the normal direction; and the bonding portion The optical film, the release film, and the protective film are bonded together to form a bonded optical film so that the longitudinal direction of each other is uniform, and the optical film is sandwiched between the release film and the protective film; and the optical film transfer portion is bonded to the paste. The bonded optical film formed by the bonding portion is conveyed such that the width direction of the optical film matches the normal direction; and the peeling portion is formed by peeling the peeling film from the bonded optical film conveyed from the bonded optical film conveying portion; (2) a release film transporting unit that transports the peeling film that has been peeled off by the peeling portion so that the width direction of the peeling film matches the normal direction; and the peeling film transport direction changing unit that transports the second peeling film transport unit The transport direction of the release film is changed to the direction intersecting the above-described imaginary plane.

In the above-described manufacturing apparatus, the optical film transporting unit transports the strip-shaped optical film so that the orientation of the virtual plane orthogonal to the width direction of the strip-shaped optical film is fixed. The first release film transfer unit and the protective film transfer unit transport the release film and the protective film so that the width direction of the release film and the protective film match the normal direction of the virtual plane. The bonding unit is bonded to the optical film, the release film, and the protective film which are transferred as described above by sandwiching the optical film with the protective film and the release film. Thereafter, the peeling portion peels off the release film bonded to the optical film from the optical film. Thereby, a bonded optical film in which an optical film and a protective film are bonded can be manufactured. In the above-described manufacturing apparatus, the second release film conveying unit conveys the conveying direction of the peeling film after peeling so that the width direction of the release film coincides with the normal direction, and thereafter, the peeling film conveying direction changing unit removes the film. The conveyance direction is changed to a direction intersecting the above-described imaginary plane. Thereby, the degree of freedom in the layout of the manufacturing apparatus when the optical film is bonded is improved. As a result, the factory space of the installation device can be effectively utilized.

A peeling method of a release film according to still another aspect of the present invention is a method for peeling off a release film from an optical film capable of peelably bonding a strip-shaped release film, comprising: an optical film transfer step for making an optical film The optical film is conveyed in a state in which the peeling film is bonded in a manner in which the orientation of the virtual plane orthogonal to the width direction is fixed, and the peeling step is carried out from the optical film. The optical film conveyed by the step peels off the release film, and the release film transfer step is carried out by transferring the release film which is peeled off in the peeling step so that the width direction of the release film coincides with the normal direction of the virtual plane; and the release film transfer In the direction changing step, the transport direction of the release film conveyed by the peeling film transport step is changed to a direction intersecting the virtual plane.

In the above-described peeling method, the peeling film is peeled off from the optical film in which the strip-shaped peeling film is peeled off, and the direction in which the peeling film is conveyed is changed to the direction intersecting the virtual plane. Thereby, the degree of freedom in the layout of the apparatus for peeling off the release film from the optical film to which the release film is bonded is improved. As a result, the factory space of the installation device can be effectively utilized.

In one embodiment, in the optical film transfer step, the optical film may be bonded to the optical film in a state in which a strip-shaped protective film is bonded.

In the embodiment, in the peeling film transport direction changing step, the peeling film is wound around a roller that rotates around the axis, and the transport direction of the peeling film is changed, and the shaft is separated from the peeling film. The axis in the direction in which the width direction of the release film in the transfer step intersects.

According to the present invention, it is possible to provide a technique capable of effectively utilizing a factory space when a plurality of films are bonded or when a release film is peeled off from an optical film to which a release film is bonded.

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 (protective film that can be peeled off with a release film)

21‧‧‧Release film

30, 30A, 30B, 30C, 30D‧‧‧ manufacturing equipment (manufacturing device for bonding optical film)

31‧‧‧ Film transport unit (optical film transport unit)

31a‧‧‧ Roll

32‧‧‧ Film Transport Department

32a‧‧‧ Roll

33‧‧‧ Film conveying unit (protective film conveying unit)

33a‧‧‧ Roll

34‧‧‧ Film transport unit (first peeling film transport unit)

34a‧‧‧ Roll

35‧‧‧ Film transport unit (bonding optical film transport unit)

35a‧‧‧roll

36‧‧‧ Film transport unit (release film transfer unit, second release film transfer unit)

36a‧‧‧roll

37‧‧‧Fitting Department

37a‧‧‧roll

37b‧‧‧roll

38‧‧‧ peeling department

40‧‧‧Layered body

40A‧‧‧Layer

40B‧‧‧Layer

50‧‧‧Polarized plate with surface protection film (adhesive film)

51‧‧‧Polar plate (optical film)

52‧‧‧Surface protection film (protective film)

53‧‧‧Adhesive layer

54‧‧‧Surface protection film (protective film)

60‧‧‧Multilayer surface protective film (protective film with peeling film attached to the peeling film)

61‧‧‧Release film

70, 70A, 70B‧‧‧ manufacturing equipment (manufacturing device for bonding optical film)

71‧‧‧ Film conveying unit (optical film conveying unit)

71a‧‧‧roll

72‧‧‧ Film conveying unit (protective film conveying unit)

72a‧‧‧roll

73‧‧‧ Film Transport Department

73a‧‧‧ Roll

74‧‧‧ Film conveying unit (release film conveying unit)

74a‧‧‧ Roll

75‧‧‧ Film conveying unit (bonding optical film conveying unit)

75a‧‧‧roll

76‧‧‧ peeling department

77‧‧‧Fitting Department

77a‧‧‧ Roll

77b‧‧‧ Roll

A1‧‧ Direction

A2‧‧‧ direction

A3‧‧‧ directions

A4‧‧‧ direction

A5‧‧‧ direction

A6‧‧‧ direction

F‧‧‧ film

P1‧‧‧Imaginary plane (1st imaginary plane)

P2‧‧‧Imaginary plane (2nd imaginary plane)

P3‧‧‧Imaginary plane (1st imaginary plane)

P4‧‧‧Imaginary plane (2nd imaginary plane)

TB‧‧‧Transportation Direction Change Department

TB1‧‧‧Transport direction change unit (protection film transfer direction change unit)

TB2‧‧・Transport direction change unit (removal film transport direction change unit)

TB3‧‧‧Transport direction change unit (protection film transfer direction change unit)

TB4‧‧・Transport direction change unit (release film transfer direction change unit)

Fig. 1 is a schematic view showing a layer configuration of a bonded optical film in the first embodiment.

Fig. 2 is a schematic view showing a layer configuration of a build-up protective film used for the production of the bonded optical film shown in Fig. 1.

Fig. 3 is a view for explaining a conveying direction changing unit used for the production of the bonded optical film shown in Fig. 1 .

Fig. 4 is a view for explaining a method of manufacturing the bonded optical film shown in Fig. 1.

Fig. 5 is a view for explaining a method of manufacturing the bonded optical film shown in Fig. 1.

Fig. 6 is a view for explaining another example of the method of manufacturing the bonded optical film shown in Fig. 1.

Fig. 7 is a view for explaining another example of the method of manufacturing the bonded optical film shown in Fig. 1.

Fig. 8 is a schematic view showing a layer configuration of another example of the bonded optical film in the first embodiment.

Fig. 9 is a view for explaining a method of manufacturing the bonded optical film shown in Fig. 8.

Fig. 10 is a schematic view showing a layer configuration of another example of the bonded optical film in the first embodiment.

Fig. 11 is a view for explaining a method of manufacturing the bonded optical film shown in Fig. 10.

Fig. 12 is a view for explaining a method of manufacturing the bonded optical film shown in Fig. 10.

Fig. 13 is a schematic view showing a layer configuration of a bonded optical film in the second embodiment.

Fig. 14 is a schematic view showing a layer configuration of a laminated surface protective film for producing the bonded optical film shown in Fig. 13.

Fig. 15 is a view for explaining a method of manufacturing the bonded optical film shown in Fig. 13.

Fig. 5 is a view for explaining a method of manufacturing the bonded optical film shown in Fig. 13.

Figure 17 is a view showing another example of the method of manufacturing the bonded optical film shown in Figure 13; The illustrated schema.

Fig. 18 is a view for explaining another example of the method of manufacturing the bonded optical film shown in Fig. 13.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Attach the same symbol to the same element. The description of the repetition will be omitted. The dimensional ratio of the drawings is not necessarily consistent with the description of the article. In the description, terms such as "upper" and "lower" indicate a convenient term based on the state shown in the drawing.

(First embodiment)

As a first embodiment, a configuration will be described in which a strip-shaped polarizing plate having a cross-sectional configuration schematically shown in Fig. 1 is produced. In the following description, the "belt shape" refers to an elongated planar shape having a fixed width in a plan view (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 the protective films 12 and 13 are bonded to the polarizing film 11. The width of the polarizing plate 10 (the length orthogonal to the thickness direction) is 1000 mm or more, and 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. The polarizing plate 10 is bonded to, for example, a liquid crystal cell to constitute a liquid crystal panel.

The polarizing film 11 is an optical film having linear polarization characteristics, which is a characteristic of selectively transmitting light that vibrates in a specific 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 an extending step, a dyeing step, and a crosslinking step on the raw material film to be the polarizing film 11.

Examples of the raw material film include polyvinyl alcohol (hereinafter referred to as "PVA") resin film, polyvinyl acetate resin film, and ethylene/vinyl acetate (hereinafter referred to as "EVA") resin film. , a polyamide resin film and a polyester resin film. Generally, a PVA-based resin film can be used from the viewpoint of the adsorptivity and alignment of the dichroic dye, in particular A PVA film was used. Unless otherwise specified, in the following description, the raw material film is a PVA film.

In the stretching step, the strip-shaped raw material film is uniaxially stretched in the longitudinal direction. The extension method can also be any one of the dry and wet extension methods. The example of the stretching ratio is 3 to 8 times. The uniaxial extension of the raw material film can be carried out before, during, or after dyeing of the dichroic dye. In the case of uniaxial stretching after dyeing, the uniaxial stretching may also be carried out before the crosslinking treatment described later or during the crosslinking treatment. Further, uniaxial stretching may be performed in the above plurality of stages. In the dyeing treatment step, the raw material film is dyed with a dichroic dye. Examples of the dichroic dye used for dyeing include iodine and a dichroic dye. By the dyeing treatment step, the dichroic dye is aligned in the direction in which the raw material film is extended and adsorbed to the raw material film. As a result, the dyed raw material film has linear polarization characteristics. In the crosslinking step, the raw material film subjected to the dyeing treatment step is immersed in an aqueous solution containing a crosslinking agent to carry out a crosslinking treatment. A preferred example of the crosslinking agent is boric acid, but other crosslinking agents such as a boron compound such as borax, glyoxal, and glutaraldehyde may also be used. This crosslinking treatment is a treatment for achieving water resistance or hue adjustment (preventing blue color) 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 may be, for example, a polyolefin resin such as a chain polyolefin resin (such as a polypropylene resin) or a cyclic polyolefin resin (such as a decene-based resin); Ethylene cellulose, cellulose cellulose resin such as polyethylene terephthalate or polybutylene terephthalate; polycarbonate resin; (meth)acrylic resin like methacrylate-based resin; polystyrene resin; polyvinyl chloride resin; acrylonitrile ‧ butadiene ‧ styrene resin; acrylonitrile ‧ styrene resin; Vinyl ester resin; polyvinylidene chloride resin; polyamine resin; polyacetal resin; modified polyphenylene ether resin; polyfluorene resin; polyether oxime resin; polyarylate resin; Polyamidiamine-based resin; polyimide-based resin. Moreover, the protective film 12 can be, for example, a phase difference A film and a brightness-enhancing film have a protective film that has an optical function. An example of the thickness of the protective film 12 is 10 μm to 200 μm.

Similarly to the protective film 12, the protective film 13 is a film for protecting the polarizing film 11. 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). An example of the resin film constituting 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. The example of the thickness of the protective film 13 is also 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 of manufacturing the polarizing plate 10 will be described. The strip-shaped protective films 12 and 13 are bonded to both surfaces of the strip-shaped polarizing film 11 so that the longitudinal direction of the strip-shaped protective films 12 and 13 are aligned, whereby the polarizing plate 10 is produced.

In the manufacturing process of the polarizing plate 10, the strip-shaped laminated protective film 20 schematically shown in Fig. 2 is used. FIG. 2 schematically shows a cross-sectional configuration (or a laminated structure) orthogonal to the longitudinal direction of the build-up protective film 20. The laminated protective film 20 is a film obtained by adhering the strip-shaped release film 21 to one surface of the protective film 13 so that the strip-shaped release film 21 and the protective film 13 are aligned in the longitudinal direction.

For example, a self-adhesive resin film having adhesion alone can be used as the release film 21. As a material of the self-adhesive resin film, it is possible to ensure a certain degree of transparency in consideration of ease of handling, and it can be mass-produced and inexpensive in the industry, and a polyethylene resin, a polypropylene resin, a polystyrene resin, and the like can be preferably used. As the polyethylene terephthalate resin or the like, a polyethylene resin film having a soft property therein is preferably used. Further, the film may be used as a film which can be peeled off, and the film may be formed by forming one or two or more of the above resins into a single layer or a plurality of layers. The thickness of the release film 21 is 5 μm to 200 μm, preferably 10 μm to 100 μm. Here, the self-adhesive resin film is exemplified as the release film 21, but the release film 21 may be a film having an adhesive layer.

In the manufacturing process of the polarizing plate 10, the transport direction shown in the mode of FIG. 3 is changed. More TB. The conveyance direction changing unit TB is a member for changing the conveyance direction of the film F conveyed in one direction. Specifically, the conveyance direction changing unit TB is a roller that is disposed on the conveyance path of the film F in a state in which the rotation axis direction intersects with the width direction of the film F. The width direction of the film F as the reference of the arrangement direction (direction of the rotation axis) of the conveyance direction changing unit TB refers to the width direction of the film F before entering the conveyance direction changing unit TB. The roller as the conveyance direction changing unit TB is known as a steering lever. FIG. 3 shows an example in which the width direction of the film F and the rotation axis of the conveyance direction changing unit TB intersect at about 45 degrees.

A previously known roller can be used as the steering direction changing portion TB. Examples of the conveyance direction changing unit TB include a metal roll, a rubber roll, a sponge rubber roll, a resin roll, and a carbon roll. Examples of the material of the metal roll include stainless steel such as SUS304 and SUS316, and aluminum. Examples of the material of the rubber roll include ruthenium rubber, fluororubber, chloroprene rubber, and nitrile rubber. Examples of the material of the resin roll include fluororesin and the like, and examples of the material of the carbon roll include carbon fiber reinforced plastic.

The metal roll, the rubber roll, the resin roll, and the carbon roll are preferably rolled so that the maximum height of the roughness curve of JIS B 0601 (surface roughness) of the surface roughness is 0.1 μm to 1.0 μm. A protective film such as a chrome plating layer, a nickel plating layer, or a diamond-like carbon may be formed on the outermost surface. In the case where the protective film is formed on the outermost surface, it is preferable to grind the maximum height of the roughness curve of JIS B 0601 (surface roughness) of the surface roughness of the outermost surface to be 0.1 μm to 1.0 μm. .

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

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

A manufacturing apparatus (manufacturing apparatus for bonding optical films) 30 of the polarizing plate 10 will be described with reference to FIGS. 4 and 5 . FIG. 4 corresponds to the case where the manufacturing apparatus 30 is viewed from the upper side. Fig. 5 corresponds to the view when the manufacturing apparatus 30 is viewed from the side.

The hatched portion in Fig. 4 indicates the protective film 12 conveyed in the downward direction from the upper side in Fig. 5 . In FIG. 5, for convenience of explanation, the thickness of the polarizing film 11, the protective film 12, and the build-up protective film 20 is emphasized to show the films. The build-up 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 fixed thickness. When the release film 21 has been peeled off, the peeled peeling is indicated by a thick solid line. Membrane 21.

For the sake of explanation, there is also a case where the upper and lower directions in FIG. 5 are referred to as a vertical direction, and the direction orthogonal to the vertical direction is referred to as a horizontal direction. In the description of FIG. 4, there are cases in which the above-described vertical direction and horizontal direction are used based on the correspondence relationship with FIG.

As schematically shown in FIGS. 4 and 5 , the manufacturing apparatus 30 includes film transport units 31 , 32 , 33 , 34 , 35 , and 36 , transport direction changing units TB1 and TB2 , a bonding unit 37 , and a peeling unit 38 .

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

The film transport unit 31 has a plurality of rollers 31a arranged such that the rotation axes are parallel to each other. The number of the rollers 31a is not limited to the number shown in Figs. 4 and 5. The plurality of rolls 31a are arranged such that the extending direction of the rotating shaft thereof coincides with the width direction of the polarizing film 11 (or orthogonal to the longitudinal direction of the polarizing film 11). By this, the film transport unit 31 transports the polarizing film 11 so that the direction of the virtual plane (first imaginary plane) P1 orthogonal to the width direction of the polarizing film 11 is substantially constant. In other words, the film transport unit 31 transports the polarizing film 11 such that the normal direction of the virtual plane P1 substantially coincides with 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. In Figure 4 and Figure 5, for the sake of convenience The imaginary plane P1 is shown as a fixed size, but the imaginary plane P1 is an imaginary 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 to the bonding unit 37. The film transport unit 32 is disposed on one side of the polarizing film 11 transported by the film transport unit 31. In the embodiment 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 rollers 32a arranged such that the rotation axes are parallel to each other. The number of rollers 32a is not limited to the number shown in Figs. 4 and 5. The plurality of rollers 32a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the protective film 12 (or substantially orthogonal to the longitudinal direction of the protective film 12), and substantially corresponds to the roller. The direction of extension of the axis of rotation of 31a is parallel. Thereby, the film transport unit 32 transports the protective film 12 such that the width direction of the protective film 12 substantially coincides with the normal direction of the virtual plane P1.

The film transport unit (protective film transport unit) 33 (see FIG. 4 ) is a transport mechanism for transporting the build-up 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. In the embodiment shown in FIGS. 4 and 5, the film transport portion 33 is disposed on the lower side of the polarizing film 11 in the vertical direction.

The film conveying unit 33 has a plurality of rollers 33a arranged such that the extending directions of the rotating shafts are parallel. The number of rollers 33a is not limited to the number shown in FIG. The plurality of rollers 33a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the build-up protective film 20 (or substantially orthogonal to the longitudinal direction of the build-up protective film 20), and the roller The direction of extension of the axis of rotation of 31a intersects (orthogonal in the example of Fig. 4). Thereby, the film transfer unit 33 transports the build-up protective film 20 in such a manner that the direction of the virtual plane P2 orthogonal to the width direction of the build-up protective film 20 is substantially constant, and the virtual plane P2 intersects the virtual plane P1. In FIG. 4, the virtual plane P2 is represented by a fixed size for convenience of illustration, but the virtual plane P2 is an imaginary infinite plane similarly to the virtual plane P1.

The transport direction change unit (protective film transport direction change unit) TB1 is centered on the following axis On the other hand, the rotating roller (or the steering lever) intersects the width direction of the laminated protective film 20 conveyed by the film conveying portion 33. In other words, the conveyance direction changing unit TB1 is a conveyance direction changing unit TB when the film F of FIG. 3 is the build-up protective film 20. The conveyance direction changing unit TB1 changes the conveyance direction of the laminated protective film 20 that is conveyed so that the width direction of the build-up protective film 20 substantially matches the normal direction of the virtual plane P1. In the example shown in FIG. 4, the width direction of the laminated protective film 20 before being wound around the conveyance direction changing portion TB1 and the rotation axis of the conveyance direction changing portion TB1 intersect at about 45 degrees. In addition, when the laminated protective film 20 is wound around the conveyance direction changing part TB1, it is preferable to wind the laminated protective film 20 so that the peeling film 21 may contact the conveyance direction changing part TB1.

The film conveying unit 34 is a conveying mechanism for conveying the laminated protective film 20 in the longitudinal direction, and the conveying direction of the laminated protective film 20 is changed by the conveying direction changing unit TB1. 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 embodiment illustrated in FIGS. 4 and 5, the film transporting portion 34 is disposed on the lower side of the polarizing film 11 in the vertical direction. The film transport unit 34 transports the build-up protective film 20 to the bonding unit 37 so that the protective film 13 is positioned on the side of the polarizing film 11 .

The film conveying unit 34 has a plurality of rollers 34a arranged such that the extending directions of the rotating shafts are parallel. The number of rollers 34a is not limited to the number shown in FIG. The plurality of rollers 34a are disposed such that the extending direction of the rotating shaft substantially coincides with the width direction of the build-up protective film 20 (or substantially orthogonal to the longitudinal direction of the build-up protective film 20), and substantially It is parallel to the extending direction of the rotating shaft of the roller 31a. Thereby, the film transporting unit 34 transports the laminated protective film 20 such that the width direction of the build-up protective film 20 substantially coincides with the normal direction of the virtual plane P1.

The bonding portion 37 has a pair of rollers 37a and 37b that bond the polarizing film 11, the protective film 12, and the laminated protective film 20. The pair of rollers 37a and 37b are disposed such that their rotation axes are parallel to each other and parallel to the extending direction of the rotation axis of the roller 31a. The pair of rollers 37a and 37b are disposed to face each other with the polarizing film 11 interposed therebetween in the thickness direction of the polarizing film 11. A pair of rollers 37a, 37b only It is sufficient to be disposed separately as follows, which means that a plurality of films fed between them can be pressed and bonded.

The bonding portion 37 presses the polarizing film 11, the protective film 12, and the laminated protective film 20 in the thickness direction by the pair of rollers 37a and 37b, thereby bonding the films to form a strip shape continuously. The laminate 40. The laminated body 40 is a film obtained by bonding the release film 21 to the polarizing plate 10 which is a bonding optical film shown in FIG.

The film conveying unit 35 is a conveying mechanism for conveying the laminated body 40 sent from the bonding unit 37 in the longitudinal direction. The laminated body 40 includes the polarizing plate 10 which is a bonding optical film in the first embodiment. Thereby, the film conveying unit 35 is a bonded optical film conveying unit.

The film conveying unit 35 has a plurality of rollers 35a arranged such that the extending directions of the rotating shafts are parallel. The number of rollers 35a is not limited to the number shown in Figs. 4 and 5. The plurality of rollers 35a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the laminated body 40 (or substantially orthogonal to the longitudinal direction of the laminated body 40), and substantially corresponds to the roller. The direction of extension of the axis of rotation of 31a is parallel. Thereby, the film conveying unit 35 conveys the laminated body 40 such that the width direction of the laminated body 40 substantially coincides with the normal direction of the virtual plane P1.

The peeling portion 38 is a roller that peels off the release film 21 from the laminated body 40. Such a roll is known as a peeling roll. The peeling portion 38 is disposed downstream of the bonding portion 37 in the conveying direction of the laminated body 40, and is disposed in contact with the release film 21.

The film transport unit (release film transport unit) 36 is a transport mechanism for transporting the peeling film 21 from which the peeling portion 38 is peeled off in the longitudinal direction. The film transport unit 36 has a plurality of rollers 36a arranged such that the rotation axes are parallel to each other. The number of rollers 36a is not limited to the number shown in Figs. 4 and 5. The plurality of rollers 36a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the release film 21 (or orthogonal to the longitudinal direction of the release film 21), and substantially coincides with the roller 31a. The extending direction of the rotating shaft is parallel. Thereby, the film transport unit 36 moves so that the width direction of the peeling film 21 substantially coincides with the normal direction of the virtual plane P1. The release film 21 is sent.

The conveyance direction changing unit (release film conveying direction changing unit) TB2 is a roller (or a steering lever) that rotates around the axis, and the shaft intersects with the width direction of the separation film 21 conveyed by the film conveying unit 36. In other words, the conveyance direction changing unit TB2 is a conveyance direction changing unit TB when the film F of FIG. 3 is the release film 21. The conveyance direction changing unit TB2 changes the conveyance direction of the separation film 21 conveyed by the film conveyance unit 36 to a direction intersecting the virtual plane P1 (orthogonal in FIG. 4). In the example shown in FIG. 4, the width direction of the peeling film 21 before being wound around the conveyance direction changing part TB2 and the rotation axis of the conveyance direction changing part TB2 are intersected by about 45 degrees.

A method of manufacturing a polarizing plate using the manufacturing apparatus 30 will be described. When the polarizing plate 10 is manufactured, the film transfer unit 31 transfers the polarizing film 11 as an optical film to the bonding unit 37 (optical film transfer step). The film transport unit 31 transports the polarizing film 11 so that the direction of the virtual plane P1 orthogonal to the width direction of the polarizing film 11 is fixed. In this case, as shown in FIG. 4, when the manufacturing apparatus 30 is viewed from the upper side, the polarizing film 11 is conveyed in the A1 direction indicated by the hollow arrow.

The strip-shaped polarizing film 11 may be prepared as an original sheet roll, or the polarizing film 11 which is formed by performing an extending step, a dyeing step, and a crosslinking step on the raw material film may be wound in a roll shape, but may be continuously supplied to the polarizing film. 11. When the polarizing film 11 is prepared as the original sheet roll, the polarizing film 11 is fed from the original sheet roll in the transfer step of the polarizing film 11, and the film transport unit 31 transports the polarizing film 11 to the bonding unit 37. When the polarizing film 11 which is formed by performing the stretching step, the dyeing step, and the crosslinking step on the raw material film is wound in a roll shape, and the polarizing film 11 is continuously supplied, the polarized light obtained through each step is obtained. The film 11 is supplied to the film transport unit 31 and transported to the bonding unit 37. In the embodiment shown in FIG. 5, the polarizing film 11 is transported in the horizontal direction. However, if the orientation of the virtual plane P1 orthogonal to the width direction of the polarizing film 11 is fixed, the transport path is not limited to the transport in the horizontal direction.

The polarizing film 11 is conveyed and transported to the bonding unit 37 by the film transport unit 32. Membrane 12. The film transport unit 32 transports the protective film 12 such that the width direction of the protective film 12 substantially coincides with the normal direction of the virtual plane P1. In the embodiment shown in FIG. 5, the protective film 12 is conveyed by a plurality of rolls 32a, and is conveyed to the bonding portion 37 so as to be in contact with the upper surface of the polarizing film 11, and the plurality of rolls 32a are vertically oriented. It is disposed on the upper side of the polarizing film 11.

Usually, a strip-shaped protective film 12 is prepared as an original sheet roll. Therefore, in the transport step of the protective film 12, the protective film 12 is sent out from the original sheet roll, and the protective film 12 is transferred to the bonding unit 37 by the film transport unit 32.

When the polarizing film 11 and the protective film 12 are conveyed to the bonding unit 37, the strip-shaped protective film 20 is transported by the film transporting unit 33 (first protective film transporting step). The film transport unit 33 transports the build-up protective film 20 such that the virtual plane P2 orthogonal to the width direction of the build-up 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 hollow arrow.

Usually, a strip-shaped laminated protective film 20 is prepared as an original sheet roll. Therefore, in the transport step of transporting the build-up protective film 20 by the film transport unit 33, the build-up protective film 20 is sent out from the original roll, and the build-up protective film 20 is transferred by the film transfer unit 33.

By the conveyance direction changing unit TB1, the conveyance direction of the build-up protective film 20 conveyed by the film conveyance unit 33 is changed so that the width direction of the build-up protective film 20 coincides with the normal direction of the virtual plane P1 (the 1 Protective film transfer direction change step). In other words, the conveyance direction of the build-up protective film 20 is changed from the A2 direction to the A1 direction. In the step of changing the transport direction of the build-up protective film 20, the build-up protective film 20 is wound around the transport direction changing unit TB1 so that the peeling film 21 in the build-up protective film 20 is in contact with the transport direction changing unit TB1. . As a result, even if the peeling film 21 is damaged by the load or friction caused by the conveyance direction changing unit TB1, the peeling film 21 is peeled off in the subsequent step, so that the optical characteristics of the polarizing plate 10 are not adversely affected.

The laminated protective film 20 after changing the conveyance direction is conveyed to the bonding part 37 by the film conveying part 34. The film transport unit 34 transports the build-up protective film 20 such that the width direction of the build-up protective film 20 substantially coincides with the normal direction of the virtual plane P1. The film transfer unit 34 conveys the build-up protective film 20 in such a manner that the protective film 13 of the build-up protective film 20 is placed on the side of the polarizing film 11 and the build-up protective film 20 is fed to the bonding portion 37. In the embodiment shown in FIG. 5, the protective film 13 is fed to the bonding portion 37 so that the protective film 13 is in contact with the lower surface of the polarizing film 11.

In this manner, the polarizing film 11, the protective film 12, and the build-up protective film 20 are continuously fed to each of the pair of rollers 37a and 37b constituting the bonding portion 37 in a state in which their longitudinal directions are aligned.

After the polarizing film 11, the protective film 12, and the laminated protective film 20 are fed between the pair of rollers 37a and 37b, the pair of rollers 37a and 37b press the three films between them to continuously apply the protective film 12. The laminated protective film 20 is bonded to both faces of the polarizing film 11 (bonding step). Thereby, a strip-shaped laminated body 40 including the polarizing film 11, the protective film 12, and the laminated protective film 20 is formed.

The build-up protective film 20 is conveyed to the bonding portion 37 so that the release film 21 is located on the opposite side of the polarizing film 11 . As a result, the laminated body 40 formed by bonding the protective film 12 and the laminated protective film 20 to the both surfaces of the polarizing film 11 is bonded to the polarizing plate 10 as the bonding optical film. 21 people.

For the bonding of the polarizing film 11 and the protective film 12, for example, an adhesive may be applied to the bonding surface of at least one of the films, or the polarizing film 11 and the protective film 12 may be fed to the bonding film. An adhesive is applied between the pair of rolls 37a and 37b before the pair of rolls 37a and 37b. As the adhesive, a water-soluble adhesive or an ultraviolet curable adhesive can be used. Further, an adhesive may be used instead of the adhesive. The bonding of the polarizing film 11 and the build-up protective film 20 is also the same.

When the laminated body 40 formed by the bonding portion 37 is fed from the bonding portion 37, the film conveying portion 35 conveys the laminated body 40 such that the width direction of the laminated body 40 substantially coincides with the normal direction of the virtual plane P1 ( Bonding optical film transfer step). Thereby, as shown in Figure 4, when from the top When the manufacturing apparatus 30 is viewed from the side, the laminated body 40 is conveyed in the A1 direction indicated by the hollow arrow.

Thereafter, the peeling portion 38 provided on the transport path of the film transport unit 35 continuously peels off the release film 21 from the laminated body 40 (peeling step). Thereby, the polarizing plate 10 as a bonding optical film can be obtained.

After the peeling film 21 is peeled off from the laminated body 40, the film conveying unit 36 conveys the peeling film 21 so that the width direction of the peeling film 21 substantially coincides with the normal direction of the virtual plane P1 (release film conveying step).

By the conveyance direction changing unit TB2, the conveyance direction of the peeling film 21 conveyed by the film conveyance unit 36 is changed so as to intersect with the virtual plane P1 (the peeling film conveyance direction changing step). Specifically, the conveyance direction of the release film 21 is changed so that the virtual plane orthogonal to the width direction of the peeling film 21 crosses (for example, orthogonally) the virtual plane P1. FIG. 4 exemplifies a form in which the conveyance direction is changed to the direction of the hollow arrow A3. After the peeling film 21 after changing the conveyance direction as described above is conveyed by a fixed distance, for example, it is preferably wound around a roll.

In the manufacturing method of the polarizing plate 10, when the manufacturing apparatus 30 is viewed from the upper side, the polarizing film 11 is conveyed in the A1 direction, and the protective film 12 and the laminated protective film 20 are bonded together to form the laminated body 40. Further, the laminated body 40 formed as described above is conveyed in the A1 direction, and the release film 21 is continuously peeled off to produce the polarizing plate 10.

In the manufacturing method of the polarizing plate 10, the conveyance direction of the laminated protective film 20 is changed in the conveyance process until the laminated protective film 20 is sent to the bonding part 37. The A1 direction and the A2 direction shown in FIG. 4 will be specifically described.

As described above, the polarizing film 11 is conveyed in the A1 direction. On the other hand, the build-up protective film 20 is first conveyed in the A2 direction crossing the A1 direction (orthogonal in FIG. 4). Thereafter, the conveyance direction of the build-up 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 together, the films are laminated in the thickness direction. So even from the very beginning In the case where the transport direction of the build-up protective film 20 is in the A1 direction, it is necessary to form a multi-stage structure in the entire transport path up to at least the bonding portion 37 of the polarizing film 11 and the build-up protective film 20. A multi-stage structure in which the transport mechanisms that transport the films overlap each other in the vertical direction.

In the above case, the layout of the manufacturing apparatus of the polarizing plate is substantially fixed at the time of installation, and the factory space cannot be utilized effectively. Further, the work efficiency of the work such as rolling the film on the transfer roller or the maintenance work is lowered. Further, an air cleaning device is provided for the entire multi-stage structure in which the transport mechanisms of the respective membranes are arranged in a plurality of stages, and the air cleaning device includes an air filter for removing dirt, dust, and the like in the air (for example, HEPA (High Efficiency Particulate Air) filter. As a result, it is difficult to remove dirt or the like from the film transport path in the lower stage, and it is easy to cause defects due to dirt or the like in the produced polarizing plate.

On the other hand, when the conveyance direction of the build-up protective film 20 is changed in the middle of conveyance, as shown in FIG. 4, it can carry in from the horizontal direction (A2 direction) with respect to the conveyance direction (A1 direction) of the polarizing film 11. The protective film 20 is laminated to laminate the polarizing film 11 and the build-up protective film 20. Therefore, the degree of freedom in the layout when the manufacturing apparatus 30 is installed in the factory is high, and the factory space can be effectively utilized.

Further, during the transfer process of the polarizing film 11 and the build-up protective film 20, since the transfer regions in which the films do not overlap in the vertical direction can be formed, the workability of the film winding operation or the maintenance work is also improved. Thereby, the productivity of the polarizing plate 10 is also improved.

Further, in the transfer process of the polarizing film 11 and the build-up protective film 20, since the transfer regions in which the films do not overlap in the vertical direction can be formed, for example, air cleaning can be provided for the polarizing film 11 and the build-up protective film 20, respectively. Device. Therefore, it is possible to reduce the contamination contained in the polarizing plate produced or the defects caused by the dirt. 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 build-up protective film 20 is wound around the conveyance direction changing unit TB1, the conveyance direction is changed. At this time, the build-up protective film 20 is in contact with the conveyance direction changing unit TB1. It is easy to cause damage (for example, scratches) on the surface that is in contact with the conveyance direction changing unit TB1 due to the load or friction in which the direction of the laminated protective film 20 is changed by the conveyance direction changing unit TB1. However, the release film 21 is in contact with the conveyance direction changing unit TB1. . Since the peeling film 21 is a film which is peeled off by the peeling part 38, even if damage is caused in the peeling film 21 by load or friction by the conveyance direction changing part TB1, it does not have the influence on the optical characteristics of the polarizing plate 10. Thereby, the degree of freedom in the layout of the factory is improved, and the productivity of the polarizing plate 10 is also improved.

As described above, the polarizing film 11 is produced in the course of its manufacture, and is subjected to a crosslinking step after the stretching step is extended. As described above, the polarizing film 11 which is formed by the stretching step and the crosslinking step tends to be easily split in one direction. By this means, for example, when the conveyance direction changing unit TB changes the conveyance direction of the polarizing film in order to increase the degree of freedom in the layout in the factory, the polarizing film is easily damaged. On the other hand, in the manufacturing apparatus 30 and the manufacturing method using the same, the conveyance direction of the laminated protective film 20 is changed. Thereby, the degree of freedom in the layout of the factory can be improved, and the productivity of the polarizing plate 10 can be improved.

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

The release film 21 is a film that is finally processed after being peeled off from the laminate 40. However, in order to peel off the peeling film 21, and to convey the peeling film 21 to the part wound by the roll, for example, it is necessary to apply tension to the peeling film 21. That is, in order to apply tension to the peeling film 21, a fixed conveyance distance arises. Thereby, for example, when the conveyance direction of the laminated body 40 and the conveyance direction of the peeling film 21 after peeling overlap in the perpendicular direction, the layout of a factory is fixed. On the other hand, the conveyance direction of the peeling film 21 is changed in the middle. At the time, the degree of freedom in the layout of the manufacturing apparatus 30 is high, and the factory space can be more flexibly utilized.

When a thin polarizing plate is produced, the polarizing plate is deformed by the pressing state of the bonding portion 37 or the like, and becomes a defect.

On the other hand, in the first embodiment, the laminated protective film 20, the polarizing film 11, and the protective film 12 are bonded together by the bonding portion 37. Then, the laminated body 40 in which the polarizing film 11 and the laminated protective film 20 are bonded is peeled off from the peeling film 21, and the polarizing plate 10 is obtained. Since the build-up protective film 20 is bonded to the protective film 13 with the release film 21, it is thicker than the protective film 13. Then, after the laminated body 40 is formed, the release film 21 is peeled off from the laminated body 40. Therefore, the thin polarizing plate 10 can be manufactured while suppressing deformation of the polarizing plate 10 by the bonding portion 37. Therefore, the productivity of the polarizing plate 10 can be improved.

In the first embodiment described above, the laminated body 40 including the polarizing plate 10 as the bonded optical film is also an optical film to which the release film is bonded. In this case, the step after the self-bonding portion 37 is sent corresponds to a peeling method in which the release film is peeled off from the optical film to which the release film 21 is bonded.

(Change 1-1)

In the method of manufacturing a polarizing plate described with reference to FIG. 4 and FIG. 5, after the peeling film 21 is peeled off from the laminated body 40, the conveyance direction of the peeling film 21 is changed. However, this step may not be available. That is, as shown in the manufacturing apparatus 30A shown in FIG. 6, the conveyance direction changing part TB2 may not be provided. Even in this case, since the conveyance direction of the build-up protective film 20 is changed, the degree of freedom in the layout when the manufacturing apparatus 30A is installed in the factory can be improved. Further, the productivity of the polarizing plate 10 can be improved.

(Change 1-2)

In the method of manufacturing a polarizing plate described with reference to FIGS. 4 and 5, a step of changing the conveying direction of the laminated protective film 20 is provided. However, this step may not be available. In other words, as in the manufacturing apparatus 30B shown in FIG. 7, the conveyance direction changing unit TB1 may not be provided, and the film conveying unit 33 may not be provided. In this case, as long as the width direction of the build-up protective film 20 is made The build-up protective film 20 may be transported by the film transport unit 34 so as to be in the same manner as the normal direction of the imaginary plane P1. For example, when the build-up protective film 20 is prepared as the original roll, the build-up protective film 20 sent from the original roll is conveyed by the film transfer unit 34. In the modification 1-2, since the conveyance direction of the peeling film 21 has also been changed, the degree of freedom in the layout when the manufacturing apparatus 30B is installed in the factory can be improved.

(Variation 1-3)

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 as shown in FIG. 1, and the protective film 13 may be formed as in the polarizing plate 10A shown in FIG. It is bonded only to one side of the polarizing film 11. That is, the polarizing plate 10 shown in FIG. 1 may not have the protective film 12.

The polarizing plate 10A can be manufactured, for example, by the manufacturing apparatus 30C shown in FIG. The manufacturing apparatus 30C has the same configuration as the manufacturing apparatus 30 except that the film transport unit 32 is not provided. The method of manufacturing the polarizing plate using the manufacturing apparatus 30C is the same as the manufacturing method of the polarizing plate using the manufacturing apparatus 30, except that the protective film 12 is not provided in the manufacturing method of the polarizing plate 10. Since the transfer step of the protective film 12 is not provided, the polarizing film 11 and the build-up protective film 20 are bonded together in the bonding step by the bonding portion 37 to form the laminated body 40A of the films. Thereafter, in the peeling step by the peeling portion 38, the peeling film 21 is peeled off from the laminated body 40A, whereby the polarizing plate 10A is formed.

The manufacturing method described in Variation 1-3 produces a polarizing plate 10A provided with a protective film 13 on only one side of the polarizing film 11 instead of both surfaces. Thereby, the thin polarizing plate 10A can be manufactured, and the thin polarizing plate 10A is thinner than the case where the protective film is provided on both surfaces of the polarizing film. Such a thin polarizing plate 10A can be preferably used, for example, in a thin liquid crystal display device or the like.

When a thin polarizing plate is produced, the polarizing plate is deformed by the pressing state of the bonding portion 37 or the like, and becomes a defect.

On the other hand, in the modification 1-3, the laminated protective film 20 was used by the bonding part 37. The polarizing film 11 is attached. Then, the laminated body 40A of the polarizing film 11 and the laminated protective film 20 is peeled off from the peeling film 21, and the polarizing plate 10A is obtained. Since the build-up protective film 20 is bonded to the protective film 13 with the release film 21, it is thicker than the protective film 13. Then, after the laminated body 40A is formed, the release film 21 is peeled off from the laminated body 40A. 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 Modification 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 the modification 1-3, the aspect of the factory space can be effectively utilized, the workability is improved, and the productivity of the polarizing plate 10A is improved, as shown in FIG. 4 and FIG. Description stated.

Also in the modification 1-3, similarly to the modification 1-1, the step of changing the conveyance direction of the release film 21 may not be provided. Alternatively, similarly to the modification 1-2, the step of changing the conveyance direction of the build-up protective film 20 may not be provided.

(Variation 1-4)

In contrast to the modification 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 case of the polarizing plate 10B shown in FIG. In order to explain the difference in the manufacturing steps, the polarizing plate 10A and the polarizing plate 10B are separately described, but the polarizing plate 10A and the polarizing plate 10B are substantially the same.

The polarizing plate 10B can be manufactured, for example, by the manufacturing apparatus 30D shown in FIGS. 11 and 12. 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 30D differs 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.

According to the above-described difference, in the manufacturing method of the polarizing plate having the manufacturing apparatus 30D, the film transport unit 33 transports the protective film 13, and the transport direction changing unit TB1 changes the transport direction of the protective film 13, and the film transport unit 34 also changes. The protective film 13 is conveyed. Then, the bonding portion 37 bonds the protective film 12, the polarizing film 11, and the protective film 13 to form a laminated body 40B. Use In the bonding step of the bonding portion 37, the protective film 13 is peelably bonded to the polarizing film 11 to form the laminated body 40B. This can be achieved by adjusting the adhesion of the adhesive for adhering the polarizing film 11 and the protective film 13 in advance. Further, as the protective film 13, a surface protective film (protective film) having an adhesive on the side to be bonded to the polarizing film 11 may be used.

After that, the peeling unit 38 peels off the protective film 13 from the laminated body 40B, and the film transport unit 36 transports the peeled protective film 13 , and the transport direction changing unit TB2 changes the transport direction of the protective film 13 . In the manufacturing method, the polarizing plate 10B is obtained by peeling off the protective film 13 from the laminated body 40B. The hatching portion of Fig. 12 indicates the protective film 13 in which the transport direction is changed by the transport direction changing unit TB2.

Since the film transport unit 33 also transports the protective film 13, the transport step of transporting the protective film 13 by the film transport unit 36 can be regarded as the second protective film transport step. In the same manner, the transport direction changing unit TB1 changes the transport direction of the protective film 13. Therefore, the step of changing the transport direction of the protective film 13 by the transport direction changing unit TB2 can be regarded as the second protective film transport direction changing step. .

Since the polarizing film 11 and the protective film 12 are thin, for example, if only the above two films are to be bonded, similarly to the case described in the modification 1-3, there is a case where the bonding is performed. The polarizing plate is deformed by the pressing force of the pair of rollers 37a, 37b, thereby causing defects caused by the deformation.

On the other hand, when the polarizing plate 10B is manufactured by the manufacturing apparatus 30D, the protective film 13 is also bonded together. Therefore, the protective film 13 is used as a reinforcing film for bonding the polarizing film 11 and the protective film 12 together. And play the function. When the polarizing film 11 and the protective film 12 are bonded together to form the laminated body 40B, the polarizing plate 10B constituting one of the laminated bodies 40B is less likely to be deformed or the like.

Moreover, after the laminated body 40B is formed, the protective film 13 is peeled off from the laminated body 40B. Therefore, the manufactured polarizing plate 10B has the configuration shown in FIG. 10 and two of the polarizing film 11 Compared with the case where the protective film is attached to the surface, the thickness is reduced. In other words, in the manufacturing method described in the modification 1-4, the thin polarizing plate 10B can be manufactured while suppressing deformation of the polarizing plate 10B by the bonding portion 37. In other words, the manufacturing method of Modifications 1-4 can improve the productivity of the polarizing plate 10 and contribute to the manufacture of a thin polarizing plate.

In the variation 1-4, the direction in which the protective film 13 is finally peeled off is changed before the bonding step of the bonding portion 37. Therefore, similarly to the case of the manufacturing method of the polarizing plate 10, the degree of freedom in the layout when the manufacturing apparatus 30D is installed in a factory is improved. Further, even if the protective film 13 is damaged by the conveyance direction changing unit TB1, the optical characteristics of the polarizing plate 10B are not affected, and the production efficiency of the polarizing plate 10B is improved. Further, after the bonding step, the conveying direction of the protective film 13 peeled off from the laminated body 40B is changed in the middle. Therefore, according to this point, the degree of freedom in the layout when the manufacturing apparatus 30D is installed in the factory is also improved.

As described above, in the modification 1-4, the protective film 13 is peeled off from the laminated body 40B, and therefore, the protective film 13 can be regarded as a release film. Thereby, for example, the peeling film 21 can also be used instead of the protective film 13.

In the same manner as in the modification 1-1, the modification 1-4 may not include a step of changing the conveyance direction of the peeled protective film 13 after bonding. Alternatively, similarly to the modification 1-2, the step of changing the conveyance direction of the protective film 13 may not be provided before bonding.

(Variation 1-5)

The following description will be given as a modification 1-5, which means that the release film 21 is used instead of the protective film 13 in the modification 1-4, and similarly to the modification 1-2, before the bonding, it is not correct. The conveyance direction of the peeling film 21 is changed.

In the above case, the peeling film 21 is conveyed by the film transporting unit 34 so that the width direction of the peeling film 21 substantially coincides with the normal direction of the virtual plane P1. Thereby, the film transport unit 34 functions as the first peeling film transport unit that transports the peeling film 21, and the film is used. The transport step of transporting the release film 21 by the transport unit 34 can be regarded as the first peeling film transport step. In addition, the film transport unit 36 functions as a second peeling film transport unit that transports the peeled release film, and the transport step of transporting the release film 21 by the film transport unit 36 can be regarded as a second peeling film transport step. Furthermore, as described above with reference to FIG. 4 and FIG. 5, the conveyance direction changing unit TB2 functions as the conveyance direction changing unit of the release film 21, and the conveyance direction changing unit TB2 changes the conveyance direction of the release film 21. The step can be regarded as a peeling film conveying direction changing step.

The change example 1-5 corresponds to the form in which the release film 21 is used instead of the protective film 13 in the modification 1-4, and the conveyance direction of the release film 21 is not changed before bonding, and therefore, there is a change The same effect of Example 1-4.

(Second embodiment)

The following embodiment will be described as a second embodiment in which a polarizing plate 50 having a strip-shaped surface protective film having a cross-sectional structure as schematically shown in Fig. 13 is produced. The polarizing plate 50 with a surface protection film is formed, for example, by being bonded to a liquid crystal cell, and comprises a liquid crystal panel.

As shown in FIG. 13, the polarizing plate 50 with a surface protective film is a bonded optical film including a polarizing plate 51 and a surface protective film (protective film) 52. The length of the polarizing plate 50 of the strip-shaped surface protective film and the length of the longitudinal direction 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 μm to 300 μm.

The polarizing plate 51 is an optical film according to the second embodiment having linear polarization characteristics. The polarizing plate 51 can be the polarizing plates 10, 10A, and 10B manufactured in the first embodiment.

The surface protective film 52 is a self-adhesive resin film which has adhesiveness alone, a film in which the adhesive layer 53 is formed on one surface, and the like, and is bonded to the polarizing plate 51 in a peelable manner. A surface protective film in which the adhesive layer 53 is formed on one side is shown in FIG. Examples of the thickness of the surface protective film 52 may be the same as those 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 which is distributed to a market as a liquid crystal display device when a liquid crystal cell or the like having a polarizing plate 50 with a surface protective film attached thereto is used as a liquid crystal display device. The polarizing plate 50 to which the surface protective film is attached is peeled off.

An example of the thickness of the adhesive layer 53 is 5 μm to 30 μm. Examples of the adhesive constituting the adhesive layer 53 include an acrylic adhesive, an epoxy adhesive, a urethane adhesive, and an anthrone-based adhesive.

In the following description, the 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 off by the polarizing plate 50 attached to the surface protective film, the adhesive layer 53 is also peeled off. Therefore, in the following description, the surface protective film 52 on which the adhesive layer 53 is formed is also referred to as a surface protective film 54. Further, the surface protective film 52 on which the adhesive layer 53 is formed on one side is also a release film with an adhesive layer.

Next, a method of manufacturing the polarizing plate 50 with a surface protective film will be described. The strip-shaped surface protective film 54 is bonded to one surface of the strip-shaped polarizing plate 51 so that the strip-shaped surface protective film 54 and the strip-shaped polarizing plate 51 are aligned in the longitudinal direction, thereby producing surface protection. The polarizing plate 50 of the film.

In the manufacturing process of the polarizing plate 50 with the 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 which is peelably bonded to the surface protection film 54. As shown in FIG. 14, the release film 61 is bonded to the adhesive layer 53 in the surface protection film 54. The example of the release film 61 may be the same as the release film 21.

A manufacturing apparatus 70 for a polarizing plate 50 with a surface protective film will be described with reference to Figs. 15 and 16 . Fig. 15 corresponds to the case where the manufacturing apparatus 70 of the polarizing plate 50 with the surface protective film is observed from the upper side. Fig. 16 corresponds to the case where the manufacturing apparatus 70 is viewed from the side.

In FIG. 16, for convenience of explanation, the polarizing plate 51 and the laminated surface protection film 60 are emphasized by emphasizing the thickness of the polarizing plate 51 and the laminated surface protective film 60. The laminated surface protection film 60 has a laminated structure of the surface protective film 54 and the release film 61, but is schematically illustrated as having The film having a fixed thickness is used to show the peeled release film 61 by a thick solid line when the release film 61 has been peeled off. For the sake of explanation, in FIG. 16, the vertical direction is also referred to as a vertical direction, and the direction orthogonal to the vertical direction is referred to as a horizontal direction. In the description of Fig. 15, there is also a case where the above-described vertical direction and horizontal direction are used based on the correspondence relationship with Fig. 16.

As schematically shown in FIGS. 15 and 16 , the manufacturing apparatus 70 includes film conveying units 71 , 72 , 73 , 74 , and 75 , conveying direction changing units TB3 and TB4 , 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 of the polarizing plate 51. The film transport unit 71 transports the polarizing plate 51 to the bonding unit 77.

The film transport unit 71 has a plurality of rollers 71a arranged such that the rotation axes are parallel to each other. The number of rollers 71a is not limited to the number shown in Figs. 15 and 16 . The plurality of rollers 71a are arranged such that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the polarizing plate 51 (or orthogonal to the longitudinal direction of the polarizing plate 51). Thereby, the film transport unit 71 transports the polarizing plate 51 so that the direction of the virtual plane (first imaginary plane) P3 orthogonal to the width direction of the polarizing plate 51 is fixed. In other words, the film transport unit 71 transports the polarizing plate 51 such that the normal direction of the virtual plane P3 substantially coincides with the width direction of the polarizing plate 51. In FIGS. 15 and 16, the virtual plane P3 is represented by a fixed size for convenience of illustration, but the virtual plane P3 is an imaginary infinite plane.

The film transport unit (protective film transport unit) 72 (see FIG. 15) is a transport mechanism for transporting the build-up surface protection film 60 in the longitudinal direction of the build-up surface protection film 60. The film conveying unit 72 has a plurality of rollers 72a arranged such that the extending directions of the rotating shafts are parallel. The number of rollers 72a is not limited to the number shown in FIG.

The plurality of rollers 72a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the laminated surface protective film 60 (or orthogonal to the longitudinal direction of the laminated surface protective film 60), and the roller The direction of extension of the axis of rotation of 71a intersects (in Figure 15 In the example, it is orthogonal). By this, the film transporting unit 72 transports the laminated surface protective film 60 in such a manner that the orientation of the virtual plane (second imaginary plane) P4 orthogonal to the width direction of the laminated surface protective film 60 is fixed, and the virtual plane P4 Cross with the imaginary plane P3. In FIG. 15, the virtual plane P4 is represented by a fixed size for convenience of illustration, but the virtual plane P4 is an imaginary infinite plane similarly to the virtual plane P3.

The conveyance direction changing unit (protective film conveying direction changing unit) TB3 is a roller (or a steering lever) that rotates around the axis, and the axis intersects with the width direction of the laminated surface protection film 60 conveyed by the film conveying unit 72. In other words, the conveyance direction changing unit TB3 is a conveyance direction changing unit TB when the film F of FIG. 3 is the laminated surface protection film 60. The conveyance direction changing unit TB3 changes the conveyance direction of the conveyed laminated surface protection film 60 so that the width direction of the laminated surface protection 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 protection film 60 before being wound around the conveyance direction changing portion TB3 and the rotation axis of the conveyance direction changing portion TB3 intersect at about 45 degrees. In addition, when the laminated surface protection film 60 is wound around the conveyance direction changing part TB3, it is preferable to wind the laminated surface protection film 60 so that the peeling film 61 may contact the conveyance direction changing part TB3.

The film transporting unit 73 is a transport mechanism for transporting the laminated surface protective film 60 in the longitudinal direction of the laminated surface protective film 60. The transport direction of the laminated surface protective film 60 is changed by the transport direction changing unit TB3. The film conveying unit 73 has a plurality of rollers 73a arranged such that the extending directions of the rotating shafts are parallel. The number of rollers 73a is not limited to the number shown in Figs. 15 and 16 .

The plurality of rollers 73a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the laminated surface protective film 60 (or orthogonal to the longitudinal direction of the laminated surface protective film 60), and substantially It is parallel to the extending direction of the rotating shaft of the roller 71a. Thereby, the film transporting portion 73 transports the laminated surface protective film 60 such that the width direction of the laminated surface protective film 60 substantially coincides with the normal direction of the virtual plane P3.

As described below, the peeling portion 76 is provided in the transport path of the laminated surface protective film 60 of the film transporting portion 73, and the peeling film 61 is peeled off from the laminated surface protective film 60. By this, the surface protective film 54 which is the laminated surface protection film 60 in the state in which the peeling film 61 has peeled from the laminated surface protection film 60 is sent to the bonding part 77 by the film conveyance part 73.

The peeling portion 76 is a roller that peels off the release film 61 from the build-up surface protective film 60. Such a roll is known as a peeling roll. The peeling portion 76 is disposed in contact with the release film 61 during the conveyance of the build-up surface protective film 60.

The film transfer unit (release film transfer unit) 74 is a transfer mechanism for transporting the release film 61 in the longitudinal direction of the release film 61, and the release film 61 is peeled off by the peeling portion 76. The film transport unit 74 has a plurality of rollers 74a arranged such that the rotation axes are parallel to each other. The number of rollers 74a is not limited to the numbers shown in Figs. 15 and 16 .

The plurality of rollers 74a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the peeling film 61 (or orthogonal to the longitudinal direction of the peeling film 61), and substantially coincides with the roller 71a. The extending direction of the rotating shaft is parallel. Thereby, the film transporting unit 74 transports the peeling film 61 so that the width direction of the peeling film 61 substantially coincides with the normal direction of the virtual plane P3.

The conveyance direction changing unit (release film conveying direction changing unit) TB4 is a roller (or a steering lever) that rotates around the axis, and the shaft intersects with the width direction of the separation film 61 conveyed by the film conveying unit 74. In other words, the conveyance direction changing unit TB4 is a conveyance direction changing unit TB when the film F of FIG. 3 is the release film 61. The conveyance direction changing unit TB4 changes the conveyance direction of the conveyed release film 61 so as to intersect the virtual plane P3. In the example shown in FIG. 15 , the width direction of the peeling film 61 before being wound around the conveyance direction changing unit TB4 intersects with the rotation axis of the conveyance direction changing unit TB4 at about 45°.

The bonding portion 77 has a pair of rollers 77a and 77b that bond the polarizing plate 51 and the surface protective film 52. The pair of rollers 77a and 77b are disposed such that their rotation axes are parallel to each other and parallel to the extending direction of the rotation axis of the roller 71a. The pair of rollers 77a and 77b are on the thickness of the polarizing plate 51. Upward, the polarizing plates 51 are disposed to face each other. The pair of rollers 77a and 77b may be disposed to be separated as follows, and this degree means that a plurality of films fed between them can be pressed and bonded.

In the bonding portion 77, the polarizing plate 51 and the surface protective film 52 are pressed in the thickness direction by the pair of rollers 77a and 77b, whereby the polarizing plate 51 and the surface protective film 52 are bonded together to form a bonding. The polarizing plate 50 of the optical film with the surface protective film attached thereto.

The film transport unit (bonding optical film transport unit) 75 is a transport mechanism for transporting the polarizing plate 50 with the surface protective film in the longitudinal direction of the polarizing plate 50 with the surface protective film sent from the bonding unit 77. The film conveying unit 75 has a plurality of rollers 75a arranged such that the extending directions of the rotating shafts are parallel. The number of rollers 75a is not limited to the number shown in Figs. 15 and 16 .

The plurality of rollers 75a are disposed in such a manner that the extending direction of the rotating shaft thereof substantially coincides with the width direction of the polarizing plate 50 with the surface protective film (or the length direction of the polarizing plate 50 with the surface protective film) It is substantially parallel to the extending direction of the rotating shaft of the roller 71a. By this, the film transporting unit 75 transports the polarizing plate 50 with the surface protective film 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.

A method of manufacturing a polarizing plate using a surface protective film having a manufacturing apparatus 70 will be described. In the case of manufacturing the polarizing plate 50 with the surface protective film, the film transporting unit 71 transports the polarizing plate 51 as an optical film to the bonding unit 77 (optical film transporting step). The film transport unit 71 transports the polarizing plate 51 so that the direction of the virtual plane P3 orthogonal to the width direction of the polarizing plate 51 is fixed. In this case, as shown in FIG. 15, when the manufacturing apparatus 70 is viewed from the upper side, the polarizing plate 51 is conveyed in the A4 direction indicated by the hollow arrow.

In the case where the strip-shaped polarizing plate 51 is the polarizing plates 10, 10A, and 10B described in the first embodiment, the film transporting unit 71 may be a transport mechanism that substantially produces polarized light in the first embodiment. After the boards 10, 10A, and 10B, the transport mechanism for transporting the polarizing plates is the same. Alternatively, when the polarizing plate 51 is prepared as the original sheet roll, In the transporting step of the light plate 51, the polarizing plate 51 is sent out from the original sheet roll, and the film transporting unit 71 transports the polarizing plate 51 to the bonding unit 77.

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

When the polarizing plate 51 is conveyed, the belt-shaped laminated surface protection film 60 is conveyed by the film conveying unit 72 (first protective film conveying step). The film transport unit 72 transports the laminated surface protective film 60 so that the virtual plane P4 orthogonal to the width direction of the build-up 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 protection film 60 is conveyed in the A5 direction indicated by the hollow arrow.

Usually, a strip-shaped laminated surface protective film 60 is prepared as an original sheet roll. Therefore, in the step of transporting the laminated surface protective film 60 by the film transport unit 72, the laminated surface protective film 60 is sent out from the original roll, and the laminated surface protective film 60 is transferred by the film transfer unit 72.

By the conveyance direction changing unit TB3, the conveyance direction of the laminated surface protection film 60 conveyed by the film conveyance unit 72 is changed so that the width direction of the laminated surface protection film 60 coincides with the normal direction of the virtual plane P3. (First protective film transfer direction changing step). In the step of changing the conveying direction of the laminated surface protective film 60, the laminated surface protective film 60 is wound in the conveying direction in advance so that the peeling film 61 in the laminated surface protective film 60 comes into contact with the conveying direction changing portion TB3. Change unit TB3. As a result, even if damage occurs in the release film 61 due to load or friction caused by the conveyance direction changing unit TB3, since the release film 61 is peeled off in the subsequent step, the optical light of the polarizing plate 50 with the surface protection film is not applied. The characteristics have any effect.

The laminated surface protection film 60 in which the conveyance direction is changed is conveyed to the bonding part 77 by the film conveyance part 73. The film transporting unit 73 transports the laminated surface protective film 60 such that the width direction of the laminated surface protective film 60 substantially coincides with the normal direction of the virtual plane P3.

In the above-described transfer process, the release film 61 is continuously peeled off from the build-up surface protective film 60 by the peeling portion 76 (peeling step). By this means, in the process of transporting the film transport unit 73, after the peeling step is performed by the peeling portion 76, the surface protective film 54 is transported by the film transport portion 73, that is, the surface of the adhesive layer 53 is formed on one surface. Film 52.

The film transport unit 73 transports the surface protective film 54 to the bonding unit 77 so that the adhesive layer 53 is positioned on the side of the polarizing plate 51. Further, when the surface protective film 54 is fed to the bonding portion 77, the film transfer portion 73 conveys the surface protective film 54 such that the longitudinal direction of the polarizing plate 51 and the surface protective film 54 coincide with each other. In FIG. 16, the bonding portion 77 is carried by the surface protective film 54 so that the adhesive layer 53 comes into contact with the lower surface of the polarizing plate 51.

After the peeling film 61 is peeled off from the laminated surface protective film 60, the peeling film 61 is conveyed so that the width direction of the peeling film 61 substantially coincides with the normal direction of the virtual plane P3 by the film conveying part 74.

By the conveyance direction changing unit TB4, the conveyance direction of the peeling film 61 conveyed by the film conveying unit 74 is changed so as to intersect the virtual plane P3. Specifically, the conveyance direction of the release film 61 is changed so that the virtual plane orthogonal to the width direction of the peeling film 61 crosses (for example, orthogonally) the virtual plane P3. In FIG. 15, the conveyance direction of the peeling film 61 is changed to the direction of the hollow arrow A6. After the peeling film 61 after changing the conveyance direction as described above is conveyed by a fixed distance, for example, it is preferably wound around a roll.

The pair of bonding members 77 are pressed against the polarizing plate 51 and the surface protective film 52 which are continuously fed between the rollers 77a and 77b, whereby the surface protective film 54 is bonded to the polarizing plate 51. step). Thereby, the polarizing plate 50 which adhered the surface protection film of the polarizing plate 51 and the surface protection film 52 via the adhesive layer 53 is formed.

The polarizing plate 50 with the surface protective film to be produced 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 the surface protective film conveyed by the film conveying unit 75 has a strip shape. Therefore, the polarizing plate 50 with the surface protective film conveyed by the film conveying portion 75 can also be wound around Roller. Alternatively, the step of processing (for example, cutting) the polarizing plate 50 having a strip-shaped surface protective film into a desired size may be carried out.

In the manufacturing method using the polarizing plate 50 having the surface protective film of the manufacturing apparatus 70, as shown in FIG. 15, when the manufacturing apparatus 70 is viewed from the upper side, the polarizing plate 51 is carried out while the polarizing plate 51 is conveyed toward the A4 direction. The surface protective film 54 is bonded to form a polarizing plate 50 with a surface protective film. In the method of manufacturing the polarizing plate 50 with the surface protective film, the conveying direction of the laminated surface protective film 60 including the surface protective film 54 is carried out until the surface protective film 54 is fed to the bonding portion 77. Make changes. The A4 direction and the A5 direction shown in FIG. 15 will be specifically described.

As described above, the polarizing plate 51 is conveyed in the A4 direction. On the other hand, the laminated surface protection film 60 is first conveyed in the A5 direction intersecting with the A4 direction (orthogonal in FIG. 15). Thereafter, the conveyance direction of the laminated surface protection film 60 is changed so that the width direction of the build-up surface protection film 60 is orthogonal to the virtual plane P3.

Therefore, the method of manufacturing the polarizing plate 50 with the surface protective film of the manufacturing apparatus 70 has at least the same operational effects as the manufacturing method of the polarizing plate 10 using the manufacturing apparatus 30 of the first embodiment. That is, the degree of freedom in the layout of the manufacturing apparatus 70 is high, and the factory space in which the manufacturing apparatus 70 is installed can be effectively utilized. Moreover, workability is also good, and the productivity of the polarizing plate 50 with a surface protective film can also be improved.

When the laminated surface protection film 60 is wound around the conveyance direction changing unit TB3 and the conveyance direction is changed, the separation film 61 comes into contact with the conveyance direction changing unit TB3. Therefore, the same effects as those in the case where the peeling film 21 is wound around the conveyance direction changing unit TB1 in the case of the first embodiment are also obtained.

In the method of manufacturing the polarizing plate 50 with the surface protective film of the manufacturing apparatus 70, the peeling film 61 is peeled off from the laminated surface protective film 60, and the conveying direction of the peeling film 61 is also changed. In the same manner as in the case where the conveying direction of the peeling film 21 after peeling is changed in the first embodiment, the degree of freedom of the layout of the manufacturing apparatus 70 is further increased. Improve, more flexible use of factory space.

(Variation 2-1)

In the method of manufacturing the polarizing plate described with reference to FIG. 15 and FIG. 16, the peeling film 61 may be peeled off from the laminated surface protective film 60, and the conveying direction of the peeling film 61 may be changed. However, this step may not be available. In other words, the conveyance direction changing unit TB4 may not be provided as in the manufacturing apparatus 70A shown in FIG. Even in this case, since the conveyance direction of the laminated surface protection film 60 is changed, the degree of freedom in the layout when the manufacturing apparatus 70A is installed in the factory can be improved. Further, the productivity of the polarizing plate 50 with the surface protective film can be improved.

(Variation 2-2)

In the method of manufacturing a polarizing plate described with reference to FIGS. 15 and 16, the step of changing the conveying direction of the laminated surface protective film 60 is performed. However, this step may not be available. In other words, as in the manufacturing apparatus 70B shown in FIG. 18, the conveyance direction changing unit TB3 may not be provided, and the film conveying unit 72 may not be provided. In this case, the laminated surface protective film 60 may be conveyed so that the width direction of the laminated surface protective film 60 substantially coincides with the normal direction of the virtual plane P3 by the film transporting portion 73. For example, when the laminated surface protection film 60 is prepared as the original sheet roll, the laminated surface protection film 60 sent from the original sheet roll is conveyed by the film conveying unit 73. In the modification 2-2, since the conveyance direction of the peeling film 61 is also changed, the degree of freedom in the layout when the manufacturing apparatus 70B is installed in the factory can be improved.

In the description of the second embodiment and the modifications thereof, the surface protective film for protecting the surface of the polarizing plate is exemplified as the protective film. However, for example, the protective film may be in the form of an adhesive layer when a polarizing plate having a surface protective film is bonded to the liquid crystal cell on one surface of the polarizing plate, or may be a protective film (so-called carrierless film). The protective film (so-called carrier-free film) is used to prevent dirt or the like from adhering to the adhesive layer until the polarizing plate with the surface protective film is bonded to the liquid crystal cell. This corresponds to, for example, a form in which the surface protective film 52 can be peeled off and adhered to the adhesive layer 53.

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

The various embodiments and variations of the present invention have been described above, but the present invention is not limited to the various embodiments and modifications described herein, and the present invention is represented by the scope of the claims and is intended to include the meaning equivalent to the scope of the claims. And all changes within the scope.

10‧‧‧Polarized plate (adhesive film)

11‧‧‧ polarizing film (optical film)

12‧‧‧Protective film (2nd protective film)

13‧‧‧Protective film

20‧‧‧Laminated protective film (protective film that can be peeled off with a release film)

21‧‧‧Release film

30‧‧‧Manufacturing device (manufacturing device for bonding optical film)

31‧‧‧ Film transport unit (optical film transport unit)

31a‧‧‧ Roll

32‧‧‧ Film Transport Department

32a‧‧‧ Roll

34‧‧‧ Film transport unit (first peeling film transport unit)

34a‧‧‧ Roll

35‧‧‧ Film transport unit (bonding optical film transport unit)

35a‧‧‧roll

36‧‧‧ Film transport unit (release film transfer unit, second release film transfer unit)

36a‧‧‧roll

37‧‧‧Fitting Department

37a‧‧‧roll

37b‧‧‧roll

38‧‧‧ peeling department

40‧‧‧Layered body

P1‧‧‧Imaginary plane (1st imaginary plane)

TB1‧‧‧Transport direction change unit (protection film transfer direction change unit)

TB2‧‧・Transport direction change unit (removal film transport direction change unit)

Claims (27)

A method for producing a bonded optical film, comprising: an optical film transfer step of transporting a strip-shaped optical film so that an orientation of a first virtual plane orthogonal to a width direction of the optical film is fixed; a first protective film a transport step of transporting a strip-shaped protective film so that a second imaginary plane orthogonal to the width direction of the protective film intersects with the first imaginary plane; and a first protective film transport direction changing step for protecting the same The direction in which the width direction of the film coincides with the normal direction of the first imaginary plane is changed in the direction in which the protective film is transported by the first protective film transporting step, and the bonding step is such that the mutual bonding step The protective film that has been changed in the transport direction in the first protective film transport direction changing step and the optical film that has been transported in the optical film transport step are bonded together to form a bonding. The optical film is bonded to the optical film and the protective film. The method of producing a bonded optical film according to claim 1, wherein the protective film is wound around a roller that is rotated around the axis in the first protective film transfer direction changing step, and the protective film is applied to the protective film. The conveyance direction is changed, and the shaft is an axis that intersects the width direction of the protective film in the first protective film transfer step. The method for producing a bonded optical film according to claim 1 or 2, wherein in the first protective film transporting step, the protective film is transported while the strip-shaped release film is detachably bonded to the protective film. In the first protective film transport direction changing step, the transport direction of the protective film is changed while the release film is bonded to the protective film. The method for producing a bonded optical film according to claim 3, wherein the first protective film is moved In the step of changing the direction of the conveyance, the surface on the side where the release film is bonded to the both surfaces of the protective film is rolled in such a manner as to be in contact with the roller which is rotated around the axis while the release film is bonded thereto. The conveyance direction of the protective film is changed by the roller, and the axis is an axis that intersects the width direction of the protective film in the first protective film transfer step. The method for producing a bonded optical film according to claim 3 or 4, further comprising: a peeling step of continuously peeling off the release film from the protective film that has been changed in the transport direction in the first protective film transfer direction changing step; And a peeling film transporting step of conveying the peeling film peeled off in the peeling step so that the width direction of the peeling film matches the normal direction of the first virtual plane, and in the bonding step, The protective film from which the release film has been peeled off is bonded to the above optical film. The method for producing a bonded optical film according to any one of claims 1 to 4, wherein in the bonding step, the protective film is peeled off in a strip-like peeling film to cause the peeling The film is placed on the opposite side of the optical film, and the protective film is bonded to the optical film. The method for producing the bonded optical film further includes a bonding optical film transfer step for bonding the optical film. The bonded optical film formed in the bonding step is transported in such a manner that the width direction coincides with the normal direction of the first imaginary plane, and the bonding optical is transferred from the bonded optical film transporting step. The film peels off the release film, and a release film transfer step of transporting the release film peeled off in the peeling step so that the width direction of the release film matches the normal direction of the first virtual plane. The method for producing a bonded optical film according to claim 5 or 6, further comprising a peeling film transporting direction changing step of changing the transporting direction of the peeling film conveyed by the peeling film transporting step It is the direction that intersects with the first imaginary plane described above. The method for producing a bonded optical film according to claim 7, wherein in the peeling film transport direction changing step, the peeling film is wound around a roller that is rotated around the axis to convey the peeling film. In the change, the axis is an axis that intersects the width direction of the release film in the peeling film transport step. 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 peelably bonded to the optical film. The method for producing a bonded optical film according to any one of claims 1 to 9, wherein in the bonding step, a strip-shaped second protective film different from the protective film is bonded to the optical film The opposite side of the surface of the protective film is combined. The method for producing a bonded optical film according to claim 1 or 2, wherein in the bonding step, the protective film is peelably bonded to the optical film, and the second shape of the strip is different from the protective film. The protective film is bonded to the surface of the optical film opposite to the surface on which the protective film is bonded, whereby the bonded optical film in a state in which the second protective film is bonded is obtained, and the bonded optical film The method for producing a film further includes a bonding optical film transfer step of transporting the bonded optical film obtained by aligning a width direction of the bonded optical film with a normal direction of the first virtual plane; and a peeling step The protective optical film is removed from the bonded optical film conveyed by the bonded optical film transfer step, and the second protective film transfer step is such that the width direction of the protective film and the normal of the first imaginary plane Transfer in the same direction as in the peeling step The above protective film. The method for producing a bonded optical film according to claim 11, further comprising a second protective film transfer direction changing step of transferring the protective film to the second protective film transfer step The conveyance direction is changed to a direction intersecting the first imaginary plane. The method of producing a bonded optical film according to claim 12, wherein in the second protective film transfer step, the protective film is wound around a roll that is rotated around the axis to convey the protective film. The axis is the axis in the direction intersecting the width direction of the protective film in the second protective film transport step. A method for producing a bonded optical film, comprising: an optical film transfer step of transporting a strip-shaped optical film so that an orientation of a virtual plane orthogonal to a width direction of the optical film is fixed; and a protective film transport step The strip-shaped protective film is conveyed 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 peelably adhered, and the peeling step continuously continues from the above The protective film peels off the release film, and the release film transfer step transports the release film peeled off in the peeling step so that the width direction of the release film coincides with the normal direction of the virtual plane; and the peeling film transport direction is changed. a step of changing a conveying direction of the release film conveyed by the peeling film conveying step to a direction intersecting the virtual plane, and a bonding step of protecting the length direction of each other The protective film conveyed by the film transporting step and the optical film attached to the optical film transporting step To form the optical film bonded to the strip of protective film formed of the optical film bonded; and The above peeling step is carried out before or after the above bonding step. The method for producing a bonded optical film according to claim 14, wherein the peeling step is performed before the bonding step, and in the bonding step, the protective film after the peeling film has been peeled off in the peeling step In combination with the above optical film. The method for producing a bonded optical film according to claim 14, wherein the peeling step is performed after the bonding step, and in the bonding step, the release film is positioned on the opposite side of the optical film. In the state in which the release film is provided, the protective film is bonded to the optical film, and in the peeling step, the release film is peeled off from the bonded optical film formed in the bonding step. The method for producing a bonded optical film according to any one of claims 14 to 16, wherein in the peeling film transport direction changing step, the peeling film is wound around a roller that rotates around the following axis, The conveyance direction of the release film is changed, and the axis is an axis that intersects the width direction of the release film in the release film transfer step. 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 peelably bonded to the optical film. The method for producing a bonded optical film according to any one of claims 14 to 18, wherein, in the bonding step, a strip-shaped second protective film different from the protective film is bonded to the optical film The opposite side of the surface of the protective film is combined. A method for producing a bonded optical film, comprising: an optical film transfer step of transporting a strip-shaped optical film so that an orientation of a virtual plane orthogonal to a width direction of the optical film is fixed; and a first release film transport step , in order to make the width direction of the above-mentioned release film and the above-mentioned false A strip-shaped release film is conveyed in such a manner that the normal direction of the plane is uniform; and a protective film transport step of transporting the strip-shaped protective film so that the width direction of the protective film matches the normal direction; and a bonding step The optical film, the release film, and the protective film are bonded to each other to form a bonded optical film by bonding the optical film to the protective film by the peeling film and the protective film. The bonded optical film is transferred. a step of transporting the bonded optical film formed in the bonding step so that the width direction of the bonded optical film coincides with the normal direction; and a peeling step of transporting from the bonded optical film transfer step The peeling film is peeled off by the bonded optical film, and the peeling film which is peeled off in the peeling step is conveyed so that the width direction of the peeling film matches the normal direction, and the peeling film is peeled off; a film transport direction changing step of changing the transport direction of the release film conveyed by the second release film transport step to Want a direction intersecting the plane. The method for producing a bonded optical film according to any one of claims 1 to 20, wherein the optical film is a polarizing film obtained by subjecting a polyvinyl alcohol resin film to elongation treatment and crosslinking treatment. An apparatus for manufacturing a bonded optical film, comprising: an optical film transporting unit that transports a strip-shaped optical film so that an orientation of a first virtual plane orthogonal to a width direction of the optical film is fixed; and a protective film transporting unit And a strip-shaped protective film is conveyed so that the second imaginary plane orthogonal to the width direction of the protective film intersects the first imaginary plane; and the protective film transport direction changing unit is configured such that the protective film has a width direction With The conveying direction of the protective film conveyed by the protective film conveying unit is changed in such a manner that the normal directions of the imaginary planes are aligned, and the bonding portions are continuously continuous so that the longitudinal directions thereof coincide with each other. The protective film is bonded to the optical film conveyed by the optical film transport unit by the protective film transfer direction changing unit, and the tape is attached to the optical film and the protective film. Optical film. An apparatus for manufacturing a bonded optical film, comprising: an optical film transporting unit that transports a strip-shaped optical film so that an orientation of a virtual plane orthogonal to a width direction of the optical film is fixed; and a protective film transporting unit; The strip-shaped protective film is conveyed so that the width direction of the protective film coincides with the normal direction of the imaginary plane in a state in which the strip-shaped release film is detachably bonded, and the peeling portion continuously continues from the above The release film is peeled off; the release film transfer unit conveys the release film peeled off by the peeling portion so that the width direction of the release film matches the normal direction of the virtual plane; and the release film transfer direction changing unit The conveying direction of the release film conveyed by the release film conveying unit is changed to a direction intersecting the virtual plane, and the bonding unit is configured to convey the protective film so as to match each other in the longitudinal direction thereof. The protective film that has been transferred from the unit is bonded to the optical film that has been transported by the optical film transport unit to form the optical film The paste and the protective film for a strip of bonding the optical film. An apparatus for manufacturing a bonded optical film, comprising: an optical film transporting unit that transports a strip-shaped optical film so that an orientation of a virtual plane orthogonal to a width direction of the optical film is fixed; a first release film conveying unit that conveys a strip-shaped release film such that a width direction of the release film coincides with a normal direction of the virtual plane; and a protective film transfer unit that makes the width direction of the protective film The protective film of the strip shape is conveyed in such a manner that the normal direction thereof is uniform, and the optical film and the release film are bonded to each other by the peeling film and the protective film sandwiching the optical film. And bonding the protective film to form a bonded optical film; and bonding the optical film transporting unit to transfer the bonded portion so that the width direction of the bonded optical film matches the normal direction An optical film; a peeling portion that peels off the release film from the bonded optical film conveyed by the bonded optical film conveying portion; and a second release film conveying portion that makes a width direction of the release film and the normal direction The peeling film that has been peeled off by the peeling portion is conveyed in a uniform manner; and the peeling film transport direction changing unit that transports the peeling film by the second peeling film transporting unit The film transport direction is changed to the first direction intersecting the virtual plane. A method for peeling off a release film, which is a method for peeling off the release film from an optical film capable of peelably bonding a strip-shaped release film, and comprising: an optical film transfer step of making a width direction with respect to the optical film The optical film is conveyed in a state in which the orthogonal plane is fixed, and the optical film is conveyed in a state in which the peeling film is bonded; and the peeling step is performed by peeling off the peeling film from the optical film conveyed by the optical film transfer step; a peeling film transporting step of transporting the peeling peeling in the peeling step so that the width direction of the peeling film matches the normal direction of the virtual plane And a peeling film conveying direction changing step of changing the conveying direction of the peeling film conveyed by the peeling film conveying step to a direction intersecting the virtual plane. The peeling method of claim 25, wherein the optical film is bonded to the optical film in a state in which a strip-shaped protective film is bonded to the optical film. The peeling method of claim 25 or 26, wherein in the peeling film transport direction changing step, the peeling film is wound around a roller that rotates around the axis, and the transport direction of the peeling film is changed. The shaft is an axis that intersects the width direction of the release film in the peeling film transport step.