WO2011149142A1

WO2011149142A1 - Method for manufacturing polarizing plate

Info

Publication number: WO2011149142A1
Application number: PCT/KR2010/004054
Authority: WO
Inventors: 장응진; 이세용; 박종석; 고연호; 황진섭
Original assignee: 주식회사 엘지화학; (주)엔에스
Priority date: 2010-05-28
Filing date: 2010-06-23
Publication date: 2011-12-01
Also published as: TWI413566B; JP2012518212A; CN102405426A; CN102405426B; JP5567127B2; TW201141648A

Abstract

The present invention relates to a method for manufacturing a polarizing plate. Specifically, the present invention comprises: a pretreatment process (S10) of preparing, washing and drying a PVA film, first and second TAC films, a protective film, and a release film; a stretching process (S20) of stretching the PVA film while stacking the first TAC film on one side of the PVA film and stacking the second TAC film on the other side of the PVA film; a coating and laminating process (S30) of coating an adhesive agent and stacking the release film on the surface of the second TAC film while laminating the protective film on the surface of the first TAC film; an inspecting process (S40) of inspecting the polarizing plate in which the coating and laminating has been completed; a laser cutting process (S50) of cutting the polarizing plate, for which the inspection has been finished, by a laser to cut individual parts; and a packing process (S70) of packing the parts which have been cut by the laser, wherein, in the laser cutting process (S50), when a laser beam is output from a laser supply source, linear polarizing components arranged perpendicular or parallel to a cutting direction of the polarizing plate are adjusted, by a polarizing adjustment unit, to be inclined by a polarizing rotation angle (á) to the crystal lattice arrangement direction of the polarizing plate, and then the laser beam cuts the polarizing plate. The method for manufacturing a polarizing plate makes it possible to simplify the cutting and inspecting of the polarizing plate to reduce the manufacturing costs, to improve the quality of the cut surface of the polarizing plate, and to increase the uniformity of the polarizing plate.

Description

Manufacturing method of polarizing plate

The present invention relates to a method of manufacturing a polarizing plate which is an optical film used in a liquid crystal display device.

This application claims the benefit of the filing date of Korean Patent Application No. 10-2010-0050582 filed with the Korea Intellectual Property Office on May 28, 2010, the entire contents of which are incorporated herein.

Cathode ray tube (CRT), which is one of the display devices used in the past, has been mainly used for monitors such as TVs, measuring devices, information terminal devices, etc., but due to the large weight and size of the CRT itself, miniaturization and weight reduction of electronic products Could not respond actively to the demands of.

In order to replace the CRT, a liquid crystal display device having advantages of small size and light weight has been actively developed, and recently, the liquid crystal display device has been developed enough to perform a role as a flat panel display device, and its demand is gradually increasing.

The image realization principle of the liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. The liquid crystal has a thin and long molecular structure and polarization in which the direction of the molecular array changes depending on its size when placed in an electric field and an anisotropy having an orientation in the array. It has a nature. The liquid crystal display is an essential component of a liquid crystal panel composed of a pair of transparent insulating substrates, each having a liquid crystal layer interposed therebetween, and having a field generating electrode formed therebetween. Various images are displayed by artificially adjusting the arrangement direction of the molecules and using the light transmittance which is changed at this time.

At this time, a polarizing plate for visualizing the liquid crystal alignment change of the liquid crystal display device is positioned on the upper and lower portions of the liquid crystal panel, respectively, the polarizing plate transmits light of the polarization component corresponding to the transmission side, the arrangement of the transmission axis of the two polarizing plates The degree of transmission of light is determined by the arrangement characteristics of and liquid crystal.

1 is a view schematically showing a general polarizer. As shown in the drawing, the polarizing plate 1 includes a polarizing layer 2 formed by stretching a polyvinyl alcohol (PVA) absorbing iodine, which is a polarizer, with a strong tension, and having a polarization axis for changing polarization characteristics of light, and It is formed on both sides of the polarizing layer (2) is formed on one side of the first and second TAC film (tri-acetatecellulose film: 3, 4), the first TAC film (3) to protect and support the polarizing layer (2) It consists of a protective film (5) for preventing surface damage of the polarizing plate (1), and a release film (7) formed on one side of the second TAC film (4) via a pressure-sensitive adhesive (6).

As shown in FIG. 2, the polarizing plate 1 prepares a raw material roll wound with a PVA film, a TAC film (first TAC film and a second TAC film), a protective film, and a release film, respectively (a in FIG. 2), After washing the raw material roll in a washing tank and drying in a drying oven (b of FIG. 2), the first and second TAC films were laminated on both sides of the PVA film, and the PVA film was stretched to draw an intermediate roll. After forming (FIG. 2C), the protective film is laminated on the surface of the first TAC film, while the release film is laminated on the surface of the second TAC film via an adhesive to form a polarizing plate roll (d of FIG. 2D). ), After cutting with a punch for each size in the cutting press (e of FIG. 2), the manufacturing is completed by the inspection and packaging process (f of FIG. 2).

Referring to the conventional manufacturing process of the polarizing plate according to the block diagram, as shown in Figure 3, a pre-treatment step (S1) of preparing, washing and drying the raw materials such as PVA film, the first and second TAC film, protective film and release film After passing through, the first TAC film is laminated on one side of the PVA film and the second TAC film is laminated on the other side of the PVA film while the stretching process (S2) for stretching the PVA film, and then protected on the surface of the first TAC film After laminating the film, the adhesive is coated on the surface of the second TAC film, and the laminating process (S3) for laminating the release film is carried out, followed by a punch cutting process (S4) for cutting with a punch for each polarizing plate size in the cutting press. Next, after going through the chamfering process (S5) for processing (milling) the edges of the cut each polarizing plate, and after the inspection process (S6) for visually inspecting each polarizing plate, the packaging for packaging each product in a pack (pack) zero Through the (S7) it is shipping the products.

In the punch cutting step (S4) to cut the cutting size larger than the final part for the edge chamfering of the chamfering process.

However, in the conventional manufacturing process of the polarizing plate, since the polarizing plate is cut with a punch, it has to go through a chamfering process for processing the cut surface, and after the chamfering process, each product must be visually inspected, which results in a lot of manufacturing time and cost. there was.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a method of manufacturing a polarizing plate to reduce the manufacturing cost by simplifying the cutting and inspection of the polarizing plate.

Another object of the present invention is to provide a method of manufacturing a polarizing plate to improve the cut surface quality of the polarizing plate and to increase the uniformity of the polarizing plate by changing the angle of the polarizing component to be inclined at a predetermined angle with the crystal lattice arrangement direction of the polarizing plate.

Method for producing a polarizing plate according to the present invention for achieving the above object is a pre-treatment step of preparing, washing and drying the PVA film, the first and second TAC film, the protective film and the release film, and the first TAC on one side of the PVA film Stretching process of laminating the film while laminating the second TAC film on the other side of the PVA film, stretching the PVA film, laminating the protective film on the surface of the first TAC film and coating the adhesive on the surface of the second TAC film Coating and laminating process for laminating the release film, inspection process for inspecting the coated and laminated polarizing plate, laser cutting process for cutting into individual parts by laser cutting on the inspected polarizer, and packing the laser cut part It is characterized by consisting of a packaging process.

The laser cutting process includes a laser slitting process for cutting a polarizing plate in a direction parallel to a crystal lattice arrangement direction, and a laser for cutting and cutting a polarizing plate cut in the laser slitting process in a direction perpendicular to the crystal lattice arrangement direction. It consists of a cutting process.

The laser cutting process includes a laser cutting process for cutting and cutting a polarizing plate in a direction perpendicular to the crystal lattice arrangement direction, and a laser slitting for cutting the polarizing plate cut in the laser cutting process in a direction parallel to the crystal lattice arrangement direction. It may be made in a process.

In the inspection process, the polarizing plate is automatically inspected, and the portion to be cut in the laser cutting process is marked for defect marking inspection.

The defect marking inspection may be performed before the laser cutting process of the laser cutting process.

In the laser cutting process, when the laser beam is output from a laser source, a linear polarization component that is perpendicular to or parallel to the cutting direction of the polarizing plate is polarized by the polarization control unit with respect to the crystal lattice arrangement direction of the polarizing plate. Cut the polarizer by tilting it as much as possible.

The laser cutting process includes a laser slitting step of cutting the polarizing plate in a direction parallel to the crystal lattice arrangement direction (transfer advancing direction), and a polarizing plate cut in the laser slitting step in a direction perpendicular to the crystal lattice arrangement direction. The cutting is made of a laser cutting process, the polarization rotation angle (α) is changed by the polarization control unit is preferably cut to be within ± 30 ° ~ 60 ° range.

The laser cutting process includes a laser cutting process for cutting the polarizing plate in a direction perpendicular to the crystal lattice arrangement direction, and a laser slitting process for cutting the polarizing plate cut in the laser cutting process in a direction parallel to the crystal lattice arrangement direction. Made, but the polarization rotation angle (α) is changed by the polarization control unit may be cut to be within ± 30 ° ~ 60 ° range.

According to the method of manufacturing a polarizing plate according to the present invention, by automatically inspecting, marking and cutting the polarizing plate with a laser, the chamfering process is omitted and packaging immediately after laser cutting, thereby reducing manufacturing time and cost, thereby reducing manufacturing costs.

And, by changing the angle of the polarization component to be inclined at a predetermined angle and the crystal lattice arrangement direction of the polarizing plate has the effect of improving the cut surface quality of the polarizing plate and to increase the uniformity of the polarizing plate.

1 is a view schematically showing a general polarizer;

2 is a view showing a process for manufacturing a general polarizing plate,

3 is a process chart showing a method of manufacturing a conventional polarizing plate,

4 is a process chart showing a method of manufacturing a polarizing plate to which the present invention is applied;

5 is a schematic view showing one embodiment of an RTS laser cutting machine used in the method of manufacturing a polarizing plate according to the present invention;

6 is a schematic view showing another embodiment of an RTS laser cutting machine used in the method of manufacturing a polarizing plate according to the present invention;

Fig. 7 is a schematic perspective view showing an embodiment of the laser cutter portion of the RTS laser cutting machine of Fig. 5 or 6;

8 is a partial detailed perspective view showing in detail the polarization control unit shown in FIG.

9 is a perspective view showing in detail the correlation between the polarization control unit and the laser beam shown in FIG.

10 and 11 are enlarged perspective views showing linear polarization components of a light collecting head, a polarizing plate, and a laser beam;

12 is a view of a comparative example showing a state in which a polarizing plate is cut in a state in which the arrangement direction of the crystal lattice is perpendicular to the polarization component of the laser beam by the laser beam irradiated in the laser cutting process;

FIG. 13 is a plane photograph showing a cut surface of the polarizing plate cut in the state of FIG. 12; FIG.

FIG. 14 is a sectional photograph showing an enlarged cross section of the polarizer shown in FIG. 13; FIG.

Fig. 15 is a planar photograph showing a cut plane of a polarizing plate cut by a 45 ° tilted laser beam with a polarization component irradiated in a laser cutting process according to an embodiment of the present invention;

FIG. 16 is a sectional photograph showing an enlarged cross section of the polarizing plate shown in FIG. 15;

FIG. 17 is a planar photograph showing a cutting plane of a polarizing plate cut by a laser beam in which a polarization component irradiated in a laser cutting process according to an embodiment of the present invention is 60 °;

FIG. 18 is a plane photograph showing a cut surface of a film cut by a laser beam in which a polarization component irradiated in a laser cutting process according to an embodiment of the present invention is tilted at 70 degrees.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a process block diagram of a method of manufacturing a polarizing plate according to the present invention. As shown in the drawing, the manufacturing process of the polarizing plate includes a pretreatment step (S10) of preparing, washing and drying a PVA film, a first and a second TAC film, a protective film, and a release film, and a first TAC film on one side of the PVA film. Stretching process (S20) for laminating the second TAC film on the other side of the PVA film and laminating the PVA film, laminating a protective film on the surface of the first TAC film and coating an adhesive on the surface of the second TAC film Coating and laminating process (S30) for laminating a release film, and an inspection process (S40) for inspecting a polarizing plate that has been coated and laminated, and a laser cutting process for cutting into laser parts on the inspected polarizing plate (S50). ), And a packaging step (S70) for packaging the laser cut parts.

In the present embodiment, the polarizing plate during manufacturing is wound and unwound and rolled in a roll as in the prior art, and is conveyed by a conveyor and a support roll to perform the operation of each process, and two or three processes may be performed continuously or the whole process may be continuously performed.

The pretreatment step (S10), the stretching step (S20) and the coating and lamination step (S30) is the same as the conventional manufacturing method of the polarizing plate. The coating and lamination process (S30) may be made separately from the coating process and lamination process.

The inspection step (S40) is a process of automatically inspecting the polarizing plate by an automatic inspector, by marking the portion to be cut in the laser cutting process (S50) to be a division of the defective goods in the laser cutting machine to be described later.

The laser cutting process (S50) is a laser slitting process (S52) for cutting the polarizing plate in a direction parallel to the crystal lattice arrangement direction (transfer advancing direction) and the crystallization of the polarizing plate cut in the laser slitting process (S52) Laser cutting process (S54) is cut in a direction perpendicular to the lattice arrangement direction.

The laser slitting step S52 and the laser cutting step S54 may be performed by separate laser cutting machines and cutting machines, or may be performed by one laser cutting machine.

In this embodiment, the laser cutting process (S54) and the packaging process (S70) are performed using one roll to sheet (RTS) laser cutting machine. And, the laser slitting process (S52) performs a slitting operation with a separate laser cutting machine. The defect marking inspection of the inspection process (S40) is performed before the laser cutting process (S54) in the RTS cutting machine.

5 is a schematic view showing one embodiment of an RTS laser cutting machine applied to the present invention. As shown in the drawing, the RTS laser cutting machine 60 includes an unwinding unit 61 which hangs a roll wound with a polarizing plate that has undergone a laser slitting process (shown in FIG. 4) and a constant tension when the polarizing plate is stopped and moved. Dancer unit (62: role of controlling the control unit), the infeed unit (63: infeed unit) for determining the size accuracy of the traveling direction and serves to supply the polarizing plate at a constant speed and the inspection process (S40) 4, a marking inspection unit 64 to which a camera sensor is attached to recognize and inspect whether or not a defect is marked on the marked portion, and a laser cutter 65 for cutting the polarizing plate in the width direction according to the marking line. Conveyor 66 for transporting the cut polarizing plate, and a packaging conveyor 67 for packing the polarizing plate conveyed through the conveyor 66 in a packaging container.

The laser cutter 65 is a portion cut using a laser beam generated from a carbon dioxide laser head, and the laser cut polarizing plate is transported through the conveyor 66 and the packaging conveyor 67 to be directly packaged. Therefore, the inspection process is unnecessary after the separate chamfering process or chamfering process as in the prior art.

Figure 6 is a schematic diagram showing another embodiment of the RTS laser cutting machine applied to the present invention. As shown, the RTS laser cutting machine 160 includes an unwinding unit (161: unwinding unit) for hanging a roll wound with a polarizing plate that has undergone a laser slitting process (shown in FIG. 4), and a constant tension when the polarizing plate is stopped and moved. Dancer unit (162: dancer unit) to control the role, and the feed unit (163: feed unit) for determining the size accuracy of the traveling direction and serves to supply the polarizing plate at a constant speed and the inspection process (S40) : Marking inspection unit 164 for recognizing and inspecting whether or not the marking of the portion marked in (indicated in Figure 4), the laser cutter unit 165 for cutting the polarizing plate in the width direction according to the marking line, and cutting using the camera Immediately before the measurement unit 166 measuring the real-time about the degree of squareness and size, the laser conveyor 167 for absorbing and fixing the polarizing plate during laser cutting, and the cutting scrap (scrap) after the laser cutting is discharged city A tilting conveyor 168, a conveyor 169-1 for conveying the cut polarizing plate, a polarizing plate transfer unit 169-2 for automatically transferring the cut polarizing plate in a sheet, and a rear portion of the conveyor 169-1. The polarizing plate mounting portion (169-3) for directly packaging the cut polarizing plate by placing a box-type packaging container in the.

That is, using the RTS laser cutting machine (FIG. 6) of the present embodiment, in the laser cutting process S54, the camera is measured and cut in real time on the squareness and size of the polarizing plate immediately before cutting using the camera, and the laser cutting process ( After S54), the scraping scraps of the defective marking portion of the polarizing plate are discharged through the tilting conveyor 168, and in the packaging process S70, the cart (or the rear portion of the conveyor 169-1 for transporting the cut polarizing plate) is loaded. Place the box-type packaging container and immediately pack or cut the cut polarizer into a trolley (or box-type packaging container) and transfer it to the polarizing plate attachment line. .

The

laser cutters

65 and 165 of the RTS

laser cutting machine

60 and 160 used in the polarizing plate manufacturing method of the present invention, as shown in Figures 7 and 8, the support frame 103, the laser beam supply source 105, a light collecting head 107, a polarization control unit 109, and a laser beam transmitter 111.

Here, the support frame 103 forms the outer body of the

laser cutter portions

65 and 165 and is a part of the entire process of processing the polarizing plate 110 cut by the

laser cutter portions

65 and 165. Disposed on the process line.

To this end, in the embodiment shown in FIG. 7, the polarizing plate 110 is introduced into the support frame 103 through a conveying means 113 such as a conveyor belt installed along the entire process line to the upper side of the support frame 103. The polarizing plate 110 is cut by the laser beam B irradiated from the condensing head 107 provided.

The laser beam source 105 is a portion for generating a laser beam (B) used to cut the polarizing plate 110 to supply to the light collecting head 107, is mounted on one side of the upper end of the support frame 103, The top plate 112 of the support frame 103 may be mounted on one side without moving or moveable together with the top plate 112. Since the internal configuration is the same as a general laser generator, detailed descriptions related to the internal configuration will be omitted. .

The condensing head 107 is a means for irradiating and cutting the laser beam B transmitted from the laser beam source 105 to the polarizing plate 110, and fixed to the front side of the upper plate 112 or the upper plate 112. Or move along with respect to the top plate 112 to cut the polarizer 110.

The polarization control unit 109 is a portion for changing the angle of the linear polarization component of the laser beam (B) output from the laser beam source 105, as shown in Figures 7 to 9, the laser beam source The laser beam B linearly output from the laser beam source 105 is preferably mounted adjacent to the output side of the laser beam source 105 so as to be located between the 105 and the light collection head 107. The angle of the polarization component P is tilted by a predetermined polarization rotation angle α with respect to the waterline in the vertical state as shown, for example, in FIGS. 8 and 9.

At this time, the polarization rotation angle (α) is a linear polarization component (P) of the laser beam (B) at right angles or parallel to the cutting direction of the polarizing plate 110 is cut while moving relative to the light collecting head 107 As the angle of rotation and inclination with respect to the crystal lattice L array direction of the polarizing plate 110, it is preferably within the range of ± 30 ° ~ 60 °, as shown in Figures 7 to 9, inclined by ± 45 ° More preferred.

As shown in the comparative example of FIG. 12, the linear polarization component P is irradiated from the condensing head 107 which is relatively moved in a state perpendicular to the arrangement direction of the crystal lattice L of the polarizing plate 110 that is the cutting object. When the polarizing plate 110 is cut by the laser beam B, as shown in FIGS. 13 and 14, there is a problem in that the quality of the cutting surface is poor, and thus the polarizing plate 110 is attached to the outermost layer of the polarizing plate after the laser cutting process. When attaching the removing tape to the film protective layer to remove the film protective layer (protective film), the surface of the polarizing plate 110 is uneven as shown in FIG. 14 so that the removing tape is not firmly attached to the polarizing plate 110. And therefore the removal of the film protective layer is not made accurately.

However, by inclining the linear polarization component of the laser beam at 45 ° with respect to the crystal lattice arrangement direction of the polarizing plate, as shown in FIGS. 15 and 16 (an embodiment of the present invention), it is possible to greatly improve the cut surface quality of the polarizing plate. In particular, when the polarization rotation angle is 45 °, the quality of the cut surface can be significantly improved without checking whether the crystal lattice arrangement direction of the polarizing plate is perpendicular or parallel to the cutting direction by the laser beam.

In addition, since not only the cut surface but also the polarizing plate surface layer adjacent to the cut surface is maintained uniformly as shown in FIG. 16, particularly in the case of a laminated polarizing plate, the protective film and the tape when attaching the removal tape on the protective film to remove the protective film forming the surface layer. By making the contact closely, the protective layer removed by the tape after the cutting can be smoothly made without errors, thereby improving process efficiency.

The quality of the cutting surface depends on the angle of inclination of the linear polarization component, and the quality of the cutting surface becomes the best as shown in FIG. 16 when the polarization rotation angle α is 45 °, and is 30 ° or 60 °. If the case is within the allowable range as shown in FIG. 17, but is less than 30 ° or more than 60 °, it is greatly worsened as in the case of 70 ° shown in FIG. 18, and at 90 °, as shown in FIG. The worst case is.

On the other hand, the polarization control unit 109, as shown in Figure 7, not only can use the existing polarization control device sold in the form of a module, as shown in Figures 8 and 9, as one optical system The polarization control unit 109 may include a main reflector 109a, an auxiliary reflector 109b, and a support bar 109c for supporting them.

The main reflector 109a is installed adjacent to the exit side of the laser beam B of the laser beam source 105 to rotate the laser beam B output from the laser beam source 105 by the polarization rotation angle α. In this case, the rotation of the laser beam B should be made on the same plane as the coordinate plane C so as not to deviate from the coordinate plane C formed by the laser beam B and the linear polarization component P.

The auxiliary reflecting mirror 109b is installed adjacent to the main reflecting mirror 109a and is perpendicular to the coordinate plane C of the laser beam B reflected by the main reflecting mirror 109a at a predetermined polarization rotation angle α. It is arranged on the coordinate plane C to reflect in the direction.

As shown in FIGS. 7 to 9, the laser beam transmitter 111 is output from the polarization controller 109, that is, a laser beam in which the polarization component reflected by the auxiliary reflector 109b is inclined. B) is to be delivered to the light collecting head 107, for this purpose between the laser beam source 105 and the light collecting head 107, that is, the polarization control unit 109 and the light collecting head 107 A plurality is provided in between.

The laser cutting process S50 is a process of cutting the polarizing plate 110 introduced into the cutting position by the laser beam B. As shown in FIG. 7, the polarizing plate 110 is parallel to the crystal lattice L direction. Alternatively, the linearly polarized light component P of the laser beam B, which is perpendicular to or parallel to the cutting direction of the polarizing plate 110 when outputted from the laser source 105, is cut in a direction perpendicular to each other. Since the polarization control unit 109 is inclined to rotate by the polarization rotation angle α with respect to the crystal lattice L array direction of the polarizing plate 110, the laser source 105 as shown in Figs. The laser beam (B) output from the light is rotated by the main reflector 109a on the coordinate plane C formed by the laser beam B and the linear polarization component P, for example, by being reflected by a polarization rotation angle α of 45 °. The linearly polarized light component P of the laser beam B thus reflected is polarized with respect to the vertical line. Full width (α) the main reflecting mirror (109a) makin inclined by, for this purpose is arranged inclined by a horizontal line and the polarization rotation angle (α).

Subsequently, the laser beam B reflected by the main reflector 109a is again reflected by the auxiliary reflector 109b and bent in a direction perpendicular to the coordinate plane C. Accordingly, the linear polarization component P 9) is inclined by the polarization rotation angle α with respect to the vertical line as shown in FIG.

In this way, the laser beam B in which the polarization component P is inclined at the polarization rotation angle α is reflected through the laser beam transmission unit 111 composed of one or more reflectors as shown in FIGS. 7 to 9. 107, the polarizing component P is inclined by the polarization rotation angle α with respect to the cutting direction of the polarizing plate 110 when it is irradiated from the light collecting head 107 to the polarizing plate 110. 110 and the cutting direction as shown in FIG. 11, that is, the crystal lattice L is arranged at right angles to the cutting direction as shown in FIG. When arranged in parallel, it is inclined by -α.

When the laser cutting process (S50) consists of a laser slitting process (S52) and a laser cutting process (S54), in the laser slitting process (S52), the crystal lattice (L) elongated by stretching the stretched polarizing plate (110). In the laser cutting process S54, the laser cutting process S54 was previously cut parallel to the crystal lattice L alignment direction in the laser slitting process S52. The polarizing plate 110 is cut in a direction perpendicular to the direction in which the crystal lattice L is arranged.

On the other hand, the polarizing plate 110 is not shown separately in the laser cutting process (S50), but the laser cutting process (S54) can be performed before the laser slitting process (S52), in this case the laser cutting process (S54) At first, the polarizing plate 110 is first cut in a direction perpendicular to the crystal lattice L array direction, and the crystal lattice L in the laser slitting process S52 following the polarizing plate 110 cut at the laser cutting process S54. ) Cut in the direction parallel to the array direction.

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and various modifications and equivalent other embodiments are possible, as well as those skilled in the art. The technical protection scope should be defined by the technical spirit of the appended claims.

Claims

A pretreatment step of preparing, washing and drying the PVA film, the first and second TAC films, the protective film and the release film;

A stretching process of laminating the first TAC film on one side of the PVA film and laminating the second TAC film on the other side of the PVA film and stretching the PVA film;

A coating and laminating process of laminating a protective film on the surface of the first TAC film while coating an adhesive on the surface of the second TAC film and laminating a release film;

An inspection process for inspecting the polarizing plate after coating and laminating,

A laser cutting process of cutting and cutting the laser on the inspected polarizer plate,

A manufacturing method of a polarizing plate comprising a packaging step of packaging a part cut by a laser.
The method according to claim 1,

The laser cutting process,

Laser slitting process of cutting the polarizing plate in a direction parallel to the crystal lattice arrangement direction;

And a laser cutting process of cutting and cutting the polarizing plate cut in the laser slitting process in a direction perpendicular to the crystal lattice arrangement direction.
The method according to claim 1,

The laser cutting process,

A laser cutting process of cutting and cutting the polarizing plate in a direction perpendicular to the crystal lattice arrangement direction;

And a laser slitting step of cutting the polarizing plate cut by the laser cutting process in a direction parallel to the crystal lattice arrangement direction.
The method according to any one of claims 1 to 3,

The method of manufacturing a polarizing plate, characterized in that the inspection process by automatically inspecting the polarizing plate while marking the portion to be cut in the laser cutting process for defective marking.
The method according to claim 4,

The defect marking inspection is performed before the laser cutting process of the laser cutting process.
The method according to claim 2 or 3,

In the laser cutting process, the polarizing plate manufacturing method, characterized in that the measurement in real time with respect to the squareness and size of the polarizing plate immediately before cutting.
The method according to claim 5,

After the laser cutting process, the manufacturing method of the polarizing plate, characterized in that for discharging the cutting scrap of the defective marking portion.
The method according to claim 1,

In the packaging process, the method of manufacturing a polarizing plate, characterized in that the packaging immediately placed on the rear portion of the conveyor for transporting the cut polarizing plate.
The method according to claim 1,

In the laser cutting process, when the laser beam is output from a laser source, a linear polarization component that is perpendicular to or parallel to the cutting direction of the polarizing plate is polarized by the polarization control unit with respect to the crystal lattice arrangement direction of the polarizing plate. Method of manufacturing a polarizing plate, characterized in that to be inclined by cutting the polarizing plate.
The method according to claim 9,

The laser cutting process includes a laser slitting step of cutting the polarizing plate in a direction parallel to the crystal lattice arrangement direction (transfer advancing direction), and a polarizing plate cut in the laser slitting step in a direction perpendicular to the crystal lattice arrangement direction. It is made by laser cutting process

The polarization rotation angle (α) is changed by the polarization control unit is a manufacturing method of the polarizing plate, characterized in that the cutting to be in the range ± 30 ° ~ 60 °.
The method according to claim 9,

The laser cutting process includes a laser cutting process for cutting the polarizing plate in a direction perpendicular to the crystal lattice arrangement direction, and a laser slitting process for cutting the polarizing plate cut in the laser cutting process in a direction parallel to the crystal lattice arrangement direction. It's done,

The polarization rotation angle (α) is changed by the polarization control unit is a manufacturing method of the polarizing plate, characterized in that the cutting to be in the range ± 30 ° ~ 60 °.