TWI694963B - Apparatus and method for producing optical film - Google Patents

Abstract

An objective of this invention is to provide an apparatus and a method for producing optical film, which are capable of easily specifying a roller group that might cause defects.

An apparatus for producing optician film of this invention performs a treatment to a film under transportation, to produce an optical film. The apparatus for producing optician film includes a plurality of rollers contacting the film, wherein the plurality of rollers are classified into a plurality of groups according to an inherent value of the respective roller, and the inherent value is determined so as to correspond to the pitch of marks on the film after the treatment when a mark at one point in a circumferential direction of the respective roll has been transferred to the film.

Description

Manufacturing device and manufacturing method of optical film

The invention relates to an optical film manufacturing device and manufacturing method.

The optical film refers to a film used for optical applications such as a member of an optical device. Various optical films are used in optical devices of image display devices (liquid crystal display devices, organic EL display devices, etc.), and a typical example thereof is a polarizing plate used in a liquid crystal display device or the like. The polarizing plate is usually a laminated optical film with a protective film attached to at least one side of the polarizing film. In addition, the polarizing film and the protective film constituting the polarizing plate are also optical films.

The manufacturing method of the optical film includes a transporting step of the transporting film (including the raw material film and the optical film manufactured by subjecting the raw material film to various treatments). The manufacturing method of the polarizing plate includes the steps of transporting the polarizing film, the protective film, and the laminated optical film formed by laminating the same, and at the same time as the transporting step, various treatments (such as bonding) are applied along the transport path deal with).

In the film conveying step as described above, defects such as scratches, contamination, and pinholes may occur on the surface of the film. In the past, various methods have been proposed to detect such defects (Japanese Patent Application 11-223608, Japanese Unexamined Patent Publication 2003-344301, etc.). Since such defects will reduce the quality of the optical device, they should be removed, and in order not to reduce the yield, it is better to suppress the occurrence of defects.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 11-223608

[Patent Document 2] Japanese Patent Laid-Open No. 2003-344301

The manufacturing apparatus for processing the film to be transported to manufacture the optical film includes various rollers (guide roller, bonding roller, cooling roller, heat roller, etc.) in contact with the film. In such a roller, if the surface is contaminated, the contamination will be transferred to the film, and scratches and contamination will occur on the surface of the film. The surface of the roller used in the optical film manufacturing apparatus is likely to be contaminated due to the adhesion of the adhesive used for the bonding of the film or the precipitation of the salt of the processing liquid used for the processing of the film. Although most of the contamination on the surface of the roller can be removed by a simple method such as washing with a cleaning solution, it is cumbersome to specify the contaminated roller visually, and on the other hand, not to specify the contaminated roller Washing with all rollers as an object is also cumbersome.

The present inventors believe that, in the manufacturing process of the optical film, when a defect occurs in the optical film, it is helpful if the roller group that may cause the defect can be specified simply. Because by specifying the roller group that may cause defects, the specified roller group is washed and maintained, In this way, the generation of defects can be suppressed efficiently and simply. Therefore, an object of the present invention is to provide an apparatus and method for manufacturing an optical film that can easily specify a roll group that may cause defects.

The present invention provides an optical film manufacturing apparatus and manufacturing method shown below.

[1] An optical film manufacturing device that processes a film to be transported to manufacture an optical film. The optical film manufacturing device includes a plurality of rollers in contact with the film; wherein the plurality of rollers are based on each The inherent value of the roller is divided into a plurality of groups. The inherent value is the pitch of the mark in a point in the circumferential direction of each roller when transferred to the film, and the mark in the film after the treatment The corresponding method is determined.

[2] The optical film manufacturing apparatus according to [1], wherein the pitch of the mark is based on the circumference of the roller and the extension applied to the film from the passing point of the roller to the end of the process Calculated by the magnification.

[3] The apparatus for manufacturing an optical film according to [1], wherein the pitch of the mark is measured in advance by transferring the mark to the film at a point in the circumferential direction of the roller.

[4] The optical film manufacturing apparatus according to any one of [1] to [3], further comprising: an inspection section for the pitch of periodic defects in the film after the completion of the processing Perform the measurement; the specific designation part is based on the pitch of the aforementioned defect and the aforementioned inherent value, The specific designation of the aforementioned group to which the aforementioned roller that may cause defects belongs.

[5] The apparatus for manufacturing an optical film as described in any one of [1] to [4], further comprising a maintenance section for the aforesaid group to which the aforementioned group specified by the specific specifying section belongs Roller for maintenance.

[6] The apparatus for manufacturing an optical film according to [5], wherein the maintenance section includes a cleaning section for cleaning the roller.

[7] A method for manufacturing an optical film, which is to process the transported film to manufacture an optical film, and the method for manufacturing the optical film includes: a transporting step of transporting the film in contact with a plurality of rollers; wherein, The plurality of rollers are divided into a plurality of groups according to the inherent values of the rollers. The inherent values are transferred to the film at a point in the circumferential direction of the rollers. The method corresponding to the pitch of the aforementioned marks is determined.

According to the present invention, it is possible to simply specify the roller group that may cause defects in the optical film manufacturing apparatus and manufacturing method.

1, 1’, 1”, 2, 2’, 2”‧‧‧‧roll

1a, 1a’, 2a, 2a’‧‧‧ mark

3‧‧‧ film

4a, 4b‧‧‧ Processing Department

5‧‧‧ Inspection Department

10‧‧‧Emerald

11‧‧‧ embryo roller

13‧‧‧swelling bath

15‧‧‧ dyeing bath

7‧‧‧Crosslink bath

19‧‧‧ Wash bath

21 to 35, 91 to 96 ‧‧‧ Guide roller

50 to 55‧‧‧ Roll

60‧‧‧ Polarizing film

61、62‧‧‧Protection film

63, 70‧‧‧ drying oven

64‧‧‧ Polarizer

65, 81‧‧‧ Inspection Department

71 to 73‧‧‧Heating roller

FIG. 1 is a cross-sectional view showing an example of an apparatus for manufacturing an optical film (polarizing film) of the present invention.

FIG. 2 is a cross-sectional view showing an example of an apparatus for manufacturing an optical film (polarizing plate) of the present invention.

Figure 3 shows the optics used to explain the method of determining the intrinsic value of the roller A cross-sectional view of a film manufacturing apparatus.

FIG. 4 is a cross-sectional view of an optical film manufacturing apparatus for explaining a method of determining the inherent value of a roller.

Fig. 5 is a cross-sectional view showing an example of an optical film manufacturing apparatus of the present invention.

[Manufacturing device and manufacturing method of optical film]

The present invention relates to an optical film manufacturing apparatus and a manufacturing method for manufacturing an optical film by processing the transported film. The optical film manufacturing apparatus of the present invention includes a plurality of rollers in contact with the film, and the plurality of rollers are divided into a plurality of groups according to the unique values of the rollers. The intrinsic value of each roller is determined when the mark at one point in the circumferential direction of each roller is transferred to the film in accordance with the pitch of the mark in the processed film.

The so-called mark is used to determine the concept of the inherent value of the roller. The case where the inherent value is determined according to the following [a] method is a hypothetical one, and the case where the inherent value is determined according to the following [b] method is In the preliminary test, marks are actually given to the rollers. When the inherent value is determined according to the method of [b] above, the mark given to the roller during the preliminary test is not particularly limited as long as it can be transferred to the film, and may be a convex shape whose shape is transferred to the film. It can also be a color marking where the color is transferred to the film. The pitch of the mark used to determine the intrinsic value of the roll is the same as the pitch of the periodic defects originating from the roll detected by the film in the film manufacturing step. Defects from the periodicity of the roller are presumed to be scratches, contamination, pinholes and other defects on the surface of the roller, which will transfer To the film, etc. The contamination generated on the surface of the roller is presumed to be the contamination caused by the adhesion of the adhesive used for the bonding of the film, or the contamination caused by the salting out of the treatment liquid used for the treatment of the film.

(Decision of inherent value)

The inherent value of each roller can be determined according to the following method [a] or method [b].

The circumference of the [a] roller is set to L, the magnification of the extension applied to the film from the point where the roller passes to the end of the process is set to n, and the value corresponding to n×L is set to the inherent value of the roller. For example, let n×L be a unique value.

[b] As a preliminary tester, after a mark to be transferred to the film is applied at a point in the circumferential direction of the roller, the pitch of the mark in the processed film is measured, and the value corresponding to the measured value is defined as the roller Inherent value. For example, the measured value is set as a unique value.

Depending on the processing content in the optical film manufacturing apparatus, the magnification n for the correct extension may be unknown. In such a case, it is preferable to determine the inherent value of the roller according to the above method [b].

Using FIGS. 3(a) and 3(b), a method of determining the inherent value of each roller in the optical film manufacturing apparatus will be specifically described. The manufacturing apparatus shown in FIGS. 3(a) and 3(b) includes: two rollers 1, 2 having different circumferences and a processing section 4a, and is a film 3 conveyed by the processing section 4a An apparatus that performs processing to manufacture an optical film. The circumference of the roller 1 is set to L1, and the circumference of the roller 2 is set to L2. Since the roller 1 has a smaller diameter than the roller 2, the circumference L1<the circumference L2.

As shown in Figure 3(a), a point in the circumferential direction of the roller 1 When the mark 1a is attached, this is transferred to the film 3. If the pitch of the mark 1a' transferred to the film 3 that has passed through the roller 1 is set to P1, the pitch P1 will coincide with the circumference L1 of the roller 1. Thereafter, the film 3 is processed by the processing section 4a. The pitch of the mark 1a' transferred to the film 3 that has passed through the processing section 4a is set to P11. In the processing section 4a, if the film 3 extends n times in the longitudinal direction, then P11=n×P1=n×L1. FIG. 3(a) shows the case where the stretch magnification n times in the processing unit 4 is doubled.

In the device shown in FIG. 3(a), the unique value of the roller 1 is determined so as to correspond to the pitch P11. The pitch P11 may be a value measured in a preliminary test (method [b]), or a value calculated by n×L1 (method [a]).

As shown in FIG. 3(b), when a mark 2a is attached to a point in the circumferential direction of the roller 2, this is transferred to the film 3. If the pitch of the mark 2a' transferred to the film 3 that has passed through the roller 2 is set to P2, the pitch P2 will coincide with the circumference L2 of the roller 2. Thereafter, the film 3 is treated by the treatment section 4a. The pitch of the mark 2a' transferred to the film 3 that has passed through the processing section 4a is set to P21. In the processing section 4a, if the film 3 extends n times in the longitudinal direction, then P21=n×P2=n×L2. Fig. 3(b) shows a case where the processing unit 4a has an extension magnification of n times 1 times.

In the device shown in FIG. 3(b), the unique value of the roller 2 is determined to correspond to the pitch P21. The pitch P21 may be a value measured in a preliminary test (method [b]), or a value calculated by n×L2 (method [a]).

FIG. 4 shows a case where the total stretch magnification n times of the processing section 4b is more than 1 times. In Figure 4, transfer to the passed processing section 4b The pitch of the mark 1a' of the film 3 is set to P12. If the total stretch magnification in the processing section 4b is set to n times, then P12=n×P1=n×L1, and P12 is P11 in the device shown in FIG. 3(a) when n times is 1 times Different. That is, even for the same roller 1, if the stretch magnification in the longitudinal direction from the passing point of the roller 1 to the end of the process is different, the inherent value will be a different value.

(Division of groups)

In the optical film manufacturing apparatus of the present invention, the plural rollers are divided into plural groups according to the unique values. Fig. 5 shows a specific example of how to divide a plurality of rollers into groups according to inherent values in an optical film manufacturing apparatus. The manufacturing device of the optical film shown in FIG. 5 is further provided with rollers having the same diameter as the roller 1 in the manufacturing device shown in FIGS. 3(a) and 3(b), that is, the same circumference L1 The rollers 1', 1" are more equipped with rollers of the same diameter as the roller 2, that is, rollers 2', 2" of the same circumference L2. The film 3 after passing through the rolls 1, 1', 1" is treated according to the same treatment section 4a, so these have the same inherent value. The stretch ratio of the treatment section 4a is doubled, so the rolls 1, 1 The inherent value of', 1'is set to the perimeter L1, and the roller with the inherent value L1 is divided into the group G1. The film 3 after passing through the rollers 2, 2', 2" is treated according to the same processing portion 4a, so these have the same inherent value. The stretching magnification of the processing portion 4a is 1 times, so the rollers 2, 2 The inherent value of', 2'is set to the circumference L2, and the group of rollers having the inherent value L2 is divided into the group G2. Table 1 shows the group distinction.

(Check procedure)

The optical film manufacturing apparatus shown in FIG. 5 includes an inspection unit 5 that measures the pitch of periodic defects of the film 3 after passing through the processing unit 4a. As long as the inspection section 5 can detect defects on the surface of the film 3, the detection method is not particularly limited. For example, the optical image on the surface of the film 3 is detected, and the detected image is smoothed, Image processing such as quadratic differentiation and binarization to detect defects. Moreover, for the defects that occur periodically within the detected defects, the pitch is calculated.

(Specific steps)

The apparatus for manufacturing an optical film shown in FIG. 5 includes a specific designation unit (not shown). The specific designation unit performs specific designation steps based on the data of the group classification shown in Table 1 to specify the group of rollers that may have defects whose pitch has been measured. The specific designation steps can also be judged by humans based on the data of group distinctions shown in Table 1 to replace the specific designation department. When the pitch of the periodic defect measured by the inspection unit 5 is, for example, L1, the group G1 including the same inherent value as the pitch L1 can be specifically designated as the group of rollers that may cause defects. Periodic measured by the inspection department 5 When the pitch of the defect is, for example, L2, the group G2 containing the same inherent value as the pitch L2 can be specifically designated as the group of rollers that may cause a defect.

In addition, there may be a deviation between the inherent value of the defective roller and the pitch of the periodic defect measured by the inspection unit 5. Therefore, in the specific designation unit, the deviation may be considered It is better to specify the defect-generating group. In addition, in the above, although the case where the group is distinguished in such a way that one group corresponds to one intrinsic value is described, it is also possible to distinguish the group in such a way that one group corresponds to the intrinsic value included in a certain numerical range . Each group belongs to one roller or a plurality of rollers.

(Maintenance procedure)

After specifying the steps, it is better to perform maintenance steps. In the maintenance step, the rollers belonging to the group specified by the specific designation step are cleaned, repaired, and exchanged according to their poor conditions. Which maintenance is suitable can be judged by visually confirming the state of the roller specified. Or, wash it first, and then if the defect is detected by the inspection step, perform the following maintenance. Within the rolls belonging to the group, it is further specified whether all rolls will have defects, or maintenance can only be performed on that roll. The maintenance step is performed when spraying and cleaning rollers, etc. can be carried out without stopping the transport of the film, and can be carried out without stopping, and when repairs, exchanges, etc. are required, after stopping the transport of the film.

The method of distinguishing the groups of plural rollers can be distinguished according to the way of belonging to the group of rollers that can also make the maintenance method common. example For example, a roller system that can be cleaned with the same cleaning solution can easily make maintenance methods common. In addition, the roller system composed of the same material can easily make the maintenance method common. By selecting the perimeter (or diameter) of the rollers arranged in each step, each roller can be divided into the desired group. According to the present invention, it is possible to easily specify the group of rollers that may cause defects. In addition, by performing maintenance according to this specific designation, the generation of periodic defects of the film can be efficiently and simply suppressed.

The optical film manufactured according to the manufacturing apparatus and manufacturing method of the present invention is, for example, an optical member applied as a member in an optical device such as an image display device (liquid crystal display device, etc.), and includes a polarizing film and a surface treatment layer A protective film, a protective film (retardation film) having a phase difference characteristic, a polarizing plate formed by laminating a protective film on at least one side of the polarizing film, etc. Examples of the surface treatment layer provided on the surface of the protective film include a hard coat layer, an antiglare layer, an antistatic layer, an antireflection layer, and an antifouling layer. In the specification of this case, the optical film may be a multilayer body or a single layer body.

<First Embodiment>

In the first embodiment, an embodiment of the manufacturing apparatus and manufacturing method of the polarizing film is shown, and the manufacturing apparatus and manufacturing method of the optical film of the present invention are described in detail.

(Transport steps)

Fig. 1 is a cross-sectional view schematically showing an example of a manufacturing apparatus used in a method of manufacturing a polarizing film. Device for manufacturing polarizing film shown in Fig. 1 It is constructed in such a way that the film 10 composed of polyvinyl alcohol-based resin is continuously wound out from the embryo roll 11 and is conveyed along the film conveying path, whereby it is sequentially passed on the film conveying path The swelling bath 13, the dyeing bath 15, the cross-linking bath 17 and the washing bath 19 are then passed through a drying oven 70 (transport step). The obtained polarizing film 60 can be directly transferred to the subsequent polarizing plate manufacturing step (a step of bonding a protective film on one side or both sides of the polarizing film 60) after the defect inspection by the inspection section 81 is performed. The arrows in Figure 1 indicate the transport direction of the film. Like the swelling bath 13, the dyeing bath 15, the cross-linking bath 17, and the washing bath 19 in FIG. 1, the bath containing the treatment liquid applied to the polyvinyl alcohol-based resin film provided on the film conveying path is also collectively referred to as It is "treatment bath".

The polarizing film manufacturing apparatus includes a plurality of rollers that support and/or process the transported film in addition to the above-mentioned processing baths and the drying furnace 70. In Figure 1, the following rollers can be placed at appropriate positions with respect to the rollers: guide rollers 21 to 35 that support the film being transported or that can further change the film transport direction; can press/hold the film being transported The driving force resulting from its rotation can be imparted to the film, or the rollers 50 to 55 that can further change the film transport direction; the heating rollers 71 to 73 that promote the drying of the film in the drying furnace 70.

The guide roll or roll system can be arranged before or after each treatment bath, drying furnace, or in the treatment bath, whereby the operation of introducing/immersing the film in the treatment bath and the operation of pulling out from the treatment bath can be performed [refer to FIG. 1 ]. For example, one or more guide rollers are provided in each processing bath, and the film is transported along these guide rollers, whereby the film can be immersed in each processing bath. The so-called roll system in this specification is not limited to the above-mentioned guide rolls, rolls and heating rolls. All rollers that rotate when in contact with the film being transported include, for example, rollers for forming the surface of the film, and cooling rollers that cool the film. The roller may be a driving roller or a free roller.

The polarizing film manufacturing apparatus shown in FIG. 1 arranges the rolls (rolls 50 to 54) before and after each processing bath, thereby allowing a cycle to be generated between the rolls arranged before and after it in any one or more processing baths The roll between the rolls that is longitudinally uniaxially stretched due to the speed difference.

(Division of groups)

The plurality of rollers (guide rollers 21 to 35, nip rollers 50 to 55, heating rollers 71 to 73) included in the manufacturing apparatus of FIG. 1 are in accordance with the circumference of the roller and from the passing point of the roller to the inspection section 81 The inherent value of each roll is determined by the magnification applied to the film, and is divided into groups. In the first drawing, rollers having three types of circumferences (referred to as "small-diameter roller", "medium-diameter roller", and "large-diameter roller") are used. Let the circumference of the small-diameter roll be L3, the circumference of the medium-diameter roll L4, and the circumference of the large-diameter roll L5.

The film 10 rolled out from the embryo roll 11 is a stretched stretched film, and the film is not stretched from the embryo roll 11 to the inspection section 81, that is, the film from the passing point of each roll to the inspection section 81 An example of a method of distinguishing a group when the extension magnification n times is 1 time. The inherent value of each roll is set to the value calculated based on the circumference and stretch ratio. Table 2 lists an example of the group distinction based on the inherent value.

The guide rollers 21 to 35 are divided into the group G3 of small-diameter rollers, the rollers 50 to 55 are grouped into the group G4 of medium-diameter rollers, and the heating rollers 71 to 73 are grouped into the group G5 of large-diameter rollers . The information on the division of the group is kept in, for example, a specific designation unit not shown, or in a specific designation unit outside. According to the method for distinguishing the groups shown in Table 2, since the rollers of the same type (guide rollers, rolls, heating rollers) belong to the same group, the maintenance method can be shared, which is more good. The method for distinguishing the groups shown in Table 2 does not need to be limited. For example, the roller group that easily adheres to the contamination from the swelling bath, the roller group that easily adheres to the stain from the dyeing bath, and the crosslinking can easily adhere to Design and manufacture the equipment by dividing the roller group contaminated by the bath and the roller group contaminated by the cleaning bath into the same group. At this time, for the rollers of each group, the solution in the treatment bath that causes contamination may be used as a cleaning solution for cleaning, etc., so that the maintenance method is common, which is preferable.

In this embodiment, although the number of groups is set to 3, it is not particularly limited as long as it is 2 or more. In the specific designation part of the manufacturing apparatus of the present invention, the specific designation of the roller that may have a defect is performed by designating the group to which the roller belongs. The type of roller circumference is limited At this time, the types of the inherent values of the rollers are also limited, so it is better to distinguish the groups in such a way that different groups are formed according to the individual values. However, when there are many types of perimeters of the roll, or when stretching is performed at various magnifications in the manufacturing process of the optical film, if there are many types of unique values, the range of the unique values to which each group belongs can be specified and performed. Group distinction.

When defining the range of intrinsic values to which each group belongs and distinguishing groups, by increasing the number of groups, the number of rollers to which each group belongs can be reduced. Therefore, when the maintenance steps for maintaining the rollers in the specified group are set in the second half, the number of rollers to be maintained can be reduced, and the troublesome maintenance steps can be reduced. The number of rollers to which each group belongs can also be one.

In addition, the division of the group has nothing to do with the group, the rollers installed in the device can be appropriately grouped according to the subsequent inherent value, or the inherent value after the configuration is calculated in advance, and the roller that becomes the desired inherent value can be selected and Arranged in each location to distinguish the group. The inherent values after the arrangement are calculated in advance, and the rollers with the desired inherent values are selected and arranged at various positions. When the groups are divided, the rollers can be selected, for example, so that each area belongs to a different group. At this time, in the specific designation step, the area where the roller that may cause a defect can be specified is specified. Since the roller arranged in the maintenance target is arranged in the same area, there is an advantage that it is easy to maintain in the maintenance step.

(Check procedure)

The manufacturing apparatus of the present invention is provided with an inspection section 81 that performs an inspection step for detecting defects on the surface of the polarizing film 60. As long as the inspection department 81 can detect Defects on the surface of the polarizing film 60 are sufficient, and the detection method is not particularly limited. For example, the optical image on the surface of the polarizing film 60 is detected, and the detected image is smoothed, quadratic differential, and binarized. Image processing to detect defects. Moreover, for the defects that occur periodically within the detected defects, the pitch is calculated.

In the manufacturing apparatus shown in FIG. 1, although the position of the inspection section 81 is provided after the drying furnace 70, the position of the inspection section 81 is not limited to this position, and may be provided at a position before the drying furnace 70. . In the specific designation step in the latter stage, according to the position of the inspection part 81, only the rollers in the front stage of the inspection part 81 can be used as the target to specify the group of rollers that may cause defects. In addition, in the manufacturing apparatus and manufacturing method of the present embodiment, an inspection step of visually detecting defects on the surface of the polarizing film 60 may be used instead of the inspection section 81 that detects defects. At this time, for periodic defects, the pitch is measured. In addition, the inspection step can be carried out on the film transport path as shown in FIG. 1, or the manufactured polarizing film can be partially cut off to make a sample to be inspected, and whether a periodic defect occurs for the sample is detected, And the pitch of defects detected when they occur.

(Specific steps)

Thereafter, in a specific designation unit (not shown), a specific designation step of designating a group including a specific value corresponding to the measured pitch of the defect is performed based on the stored data of the specific value of the group distinction. The specific designation steps can also be judged by people based on the data distinguished by the managed group.

Defects that reduce yield in optical films such as polarizing film 60 The size is usually about 10 μm to 50 μm. Since the optical film is used as a component of the optical device, the size of the defect when the optical film is visually observed by scattering, refraction, diffraction, etc. at the time of incident light may become a cause of defects than that existing in the roller The size of the bad situation (foreign objects, scratches, etc.) is greater. Therefore, only by visually confirming the state of the rollers, it is sometimes difficult to specify the rollers that have poor conditions (foreign objects, scratches, etc.) in which defects are generated. Even in such a case, if the device and method of the present invention can be used to specify the group to which the roller that may be defective belongs, by performing maintenance steps on the rollers in the group, it can be efficiently and simply suppressed The occurrence of defects.

(Maintenance procedure)

After specifying the steps, it is better to perform maintenance steps. In the maintenance step, the rollers to which the group specified by the specific designation step belongs are cleaned, repaired, and exchanged according to their poor conditions. Which maintenance is suitable can be judged by visually confirming the state of the roller specified. Or it can be washed first, and then the defect is detected by the inspection step, and the following maintenance can also be performed. Within the rollers belonging to the group, you can further specify whether all rollers will have defects, and only perform maintenance on the rollers. The maintenance step is performed when spraying and cleaning rollers, etc. can be carried out without stopping the transport of the film, and can be carried out without stopping, and when repairs, exchanges, etc. are required, after stopping the transport of the film.

<Second Embodiment>

In the second embodiment, the side shows a polarizer manufacturing apparatus and system In the embodiment of the manufacturing method, the group division of the manufacturing apparatus and manufacturing method of the optical film of the present invention will be described in detail.

FIG. 2 is a cross-sectional view schematically showing an example of a manufacturing apparatus used in a method of manufacturing a polarizing plate. In the manufacturing apparatus of the polarizing plate shown in FIG. 2, the protective films 61 and 62 are conveyed in parallel on the upper and lower sides of the polarizing film 60, and an adhesive (not shown) is inserted between the films and three films are stacked (The polarizing film 60, the protective films 61, 62) The laminated body formed passes between the pair of bonding rollers 97. Thereafter, by drying the adhesive in the drying furnace 41, the polarizing plate 64 having the protective films 61 and 62 bonded to both sides of the polarizing film 60 is manufactured. The polarizing plate 64 is wound up after being inspected by the inspection section 65.

In the manufacturing apparatus shown in FIG. 2, the guide rollers 91 and 92 for transporting the polarizing film 60, the guide rollers 93 and 94 for transporting the protective film 35, and the guide rollers for transporting the protective film 37 The 95 and 96 series use guide rollers with different perimeters to distinguish them in different ways. In this way, each area (the transport area of the polarizing film 60, the transport area of the protective film 61, and the transport area of the protective film 62) is selected in such a way that the rollers are arranged in different groups. The specific designated configuration may have an area (group) of rollers that may cause defects, and the rollers to be maintained are arranged in the same area, so there is an advantage that it is easy to maintain in the maintenance step.

The details of the inspection procedure, specific specification procedure, and maintenance procedure in this embodiment are as described in the above description in the first embodiment.

1, 2‧‧‧ Roll

1a, 1a’, 2a, 2a’‧‧‧ mark

3‧‧‧ film

4a‧‧‧Processing Department

Claims (16)

An optical film manufacturing apparatus is used to process an optical film to produce an optical film. The optical film manufacturing apparatus is provided with: an inspection section, which is a section for periodic defects in the film after the processing is completed Distance measurement; and a plurality of rollers in contact with the film; wherein the plurality of rollers are divided into a plurality of groups according to the inherent value of each roller, the inherent value is one of the points in the circumferential direction of each roller When the mark is transferred to the film, it is determined so as to correspond to the pitch of the mark in the processed film. The apparatus for manufacturing an optical film as described in item 1 of the patent application, wherein the pitch of the mark is based on the circumference of the roller and the extension applied to the film from the passing point of the roller to the end of the process Calculated by the magnification. An apparatus for manufacturing an optical film as described in item 1 of the patent application range, wherein the pitch of the mark is measured in advance by transferring the mark to the film at a point in the circumferential direction of the roller. The device for manufacturing an optical film as described in any one of the items 1 to 3 of the patent application scope further includes: a specific designation unit that specifies the aforesaid defect that may cause a defect based on the pitch of the aforementioned defect and the aforementioned inherent value The aforementioned group to which the roller belongs. The optical film manufacturing apparatus as described in any one of the items 1 to 3 of the patent application scope further includes a maintenance section, which refers to The aforementioned roller to which the aforementioned group specified by the fixed part belongs is maintained. The apparatus for manufacturing an optical film as described in item 4 of the patent application further includes a maintenance section that maintains the rollers to which the group specified by the specific designation section belongs. An apparatus for manufacturing an optical film as described in item 5 of the patent application, wherein the maintenance section includes a cleaning section for cleaning the roller. An apparatus for manufacturing an optical film as described in item 6 of the patent application, wherein the maintenance section includes a cleaning section for cleaning the roller. A method for manufacturing an optical film is to process the film to be transported to manufacture an optical film. The method for manufacturing an optical film includes: an inspection step for periodic defects in the film after the processing is completed The pitch is measured; and the conveying step of conveying the film in contact with a plurality of rollers; wherein the plurality of rollers are divided into a plurality of groups according to the inherent values of the rollers, and the inherent values are in the rollers When the mark in one point in the circumferential direction is transferred to the film, it is determined in such a manner as to correspond to the pitch of the mark in the film after the treatment. The method for manufacturing an optical film as described in item 9 of the patent application range, wherein the pitch of the mark is based on the circumference of the roller and the extension applied to the film from the passing point of the roller to the end of the process Calculated by the magnification. The method for manufacturing an optical film as described in item 9 of the scope of the patent application, wherein the pitch of the mark is a mark at a point in the circumferential direction of the roller It is transferred to the film and measured in advance. The method for manufacturing an optical film as described in any of items 9 to 11 of the patent application scope further includes: specific designation steps, which are based on the pitch of the aforementioned defect and the aforementioned inherent value, and the specific designation may cause defects The aforementioned group to which the roller belongs. The method for manufacturing an optical film as described in any one of claims 9 to 11 further includes a maintenance step performed on the aforementioned roller to which the aforementioned group specified by the aforementioned specific specifying step belongs maintain. The method for manufacturing an optical film as described in item 12 of the patent application scope further includes a maintenance step for maintaining the aforementioned roller to which the aforementioned group specified by the aforementioned specific specifying step belongs. The method for manufacturing an optical film as described in item 13 of the patent application range, wherein the maintenance step includes a step of washing the roller. The method for manufacturing an optical film as described in item 14 of the patent application range, wherein the maintenance step includes a step of washing the roller.

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