KR101221720B1 - Method for attaching polarizer and apparatus for the same - Google Patents

Abstract

The present invention comprises the steps of: a) running in any direction while releasing the polarizing plate wound on the take-up roll; And b) when the traveling polarizer reaches a position adjacent to the attaching surface of the panel, attaching and stacking the polarizing plate on the attaching surface of the panel.

Polarizer, panel

Description

Method for attaching polarizing plate and apparatus therefor {METHOD FOR ATTACHING POLARIZER AND APPARATUS FOR THE SAME}

The present invention relates to a method and apparatus for attaching a polarizing plate to a panel, and more particularly, to a method and apparatus for attaching a polarizing plate to a panel by a roll-to-panel process.

A polarizing plate generally has a structure in which a polyvinyl alcohol (PVA) -based molecular chain is oriented in a predetermined direction and includes an iodine compound or a dichroic polarizing material, or a dehydration reaction of a polyvinyl alcohol film or a polyvinyl chloride (PVC) film It has a structure which laminated | stacked the triacetyl cellulose (TAC) film with the aqueous adhesive which consists of polyvinyl alcohol-type aqueous solution as a protective film on the polarizing film which has a polyene structure formed by the dehydrochlorination reaction of the above.

A polarizing plate composed of a transparent protective film layer on one surface of the polarizer and an adhesive on the opposite surface thereof can greatly improve the color shift problem in the viewing angle when mounted on a liquid crystal display device driven in a liquid crystal mode such as a transverse electric field method. Moreover, since it consists of one layer of transparent protective layer, it is advantageous for thinness and weight reduction.

However, in order to attach the polarizing plate thus manufactured to a panel, plywood (lamination) of the polarizer and the polarizer protective layer, and then cutting, chamfering, sheet inspection, package packaging and package packing, After unpacking the pack, the sheets of polarizers must be attached to the panels, respectively.

As such, there is a problem that productivity is lowered as the polarizing plate can be attached to the panel through a complicated and large number of steps.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for attaching a polarizing plate that can improve productivity and reduce manufacturing costs by attaching a polarizing plate to a panel by a roll-to-panel process. .

The present invention comprises the steps of: a) running in any direction while releasing the polarizing plate wound on the take-up roll; And b) when the traveling polarizer reaches a position adjacent to the attaching surface of the panel, attaching and stacking the polarizing plate on the attaching surface of the panel.

The present invention is an unwinder (unwinder) to which the winding roll wound around the polarizing plate is mounted; A traveling roller for driving the polarizing plate released from the unwinder in one direction; And a mounting roller for attaching the polarizing plate to the mounting surface of the panel when the polarizer traveling by the traveling roller reaches a position adjacent to the mounting surface of the panel.

According to the present invention, in attaching the polarizing plate to the panel, the number of steps can be greatly reduced, so that the productivity is improved, and thus the manufacturing cost can be reduced.

A method of attaching a polarizing plate according to the present invention includes the steps of: a) running in any direction while releasing the polarizing plate wound on the take-up roll; And b) when the traveling polarizer reaches a position adjacent to the attaching surface of the panel, attaching and stacking the polarizing plate on the attaching surface of the panel.

Before the step a), manufacturing the polarizing plate; And winding the manufactured polarizing plate on the winding roll to prepare the winding roll on which the polarizing plate is wound.

The manufacturing of the polarizer may include preparing a polarizer; Attaching a pair of transparent protective film to the polarizer such that the polarizer is positioned between the pair of transparent protective film; And attaching a release film to an outer surface of any one of the pair of transparent protective films. Here, when attaching the release film may be attached using an adhesive.

In the preparing of the polarizer, the polyvinyl alcohol (PVA) -based film may be stretched to prepare a polarizer. After drawing, a bright spot test may be performed.

Before attaching the transparent protective film to the polarizer, it may further comprise the step of pre-processing the transparent protective film to enhance the hydrophilicity of the transparent protective film. For example, the step of pretreating the transparent protective film may be performed before stretching as shown in FIG.

The transparent protective film may be a triacetyl cellulose (TAC) film.

The method may further include attaching a surface protective film to an outer surface of the other transparent protective film of the pair of transparent protective films.

The pair of transparent protective film is located between the surface protection film and the release film and the polarizer is positioned between the pair of transparent protective film, it can be laminated at the same time.

After the step of plywood the film, the inspection of the defect of the polarizing plate consisting of the film, and if the defect occurs in the polarizing plate may further include an automatic defect inspection step of marking a mark on the defective location of the polarizing plate. In this step, you can automatically inspect the foreign material of the polarizing plate through the automatic defect inspector. When the defect is confirmed by performing a foreign material inspection of the polarizing plate by the automatic defect inspector, the mark is marked at the defect occurrence position.

After the automatic failure inspection step, the polarizing plate may further include a slitting (slitting) step of cutting to match the width direction size of the panel (see Fig. 1). Here, the laser can be used for slitting.

Simultaneously with cutting the said polarizing plate, the cut polarizing plate can be wound up by the said winding roll.

Before the step b), it may further comprise an automatic failure confirmation step of checking whether there is a mark marked on the polarizing plate in the automatic failure inspection step. If there is a mark marked on the polarizing plate in the automatic failure inspection step, the automatic failure confirmation sensor senses the mark.

After the automatic failure checking step, the polarizing plate may further include a half cutting (Half Cutting) to two sheets in accordance with the longitudinal size of the panel. The half cut may be half cut using a laser.

When half-cutting, for example, as shown in Figure 4 can be cut to two sheets except the release film.

In the half-cutting step, the marking portion (defect generation position) sensed in the automatic failure checking step may be discharged by half-cutting before and after marking.

In the step b), one of the two half-cut polarizing plate can be laminated by attaching to the attachment surface of the panel.

The panel having the polarizer attached thereto is transferred to the next step, and a new panel having no polarizer attached thereto is continuously supplied to the step b), and one panel of the two half-cut polarizers attached is transferred to the next step. The remaining one polarizer can be attached to the new panel.

In the step b), the panel having the polarizer attached to one surface may be resupplyed to the step b) so that the polarizer may be attached to the other surface.

The release film is attached to the polarizing plate of step a), and the release film is separated from the polarizing plate attached to the panel in step b) may be wound on a release film winding roll. When the release film is not cut in the half-cutting step, the release film that is not half-cut in this step may be wound on the release film winding roll.

Apparatus for attaching the polarizing plate according to the present invention includes an unwinder (unwinder) is mounted to the winding roll wound around the polarizing plate; A traveling roller for driving the polarizing plate released from the unwinder in one direction; And an attachment roller for attaching the polarizing plate to the attachment surface of the panel when the polarizer traveling by the traveling roller reaches a position adjacent to the attachment surface of the panel.

Before winding the polarizing plate on the take-up roll, the defect of the polarizing plate may be inspected, and if a defect occurs in the polarizing plate may further include an automatic defect inspector for marking a mark in the defective position of the polarizing plate.

Before winding the polarizing plate on the winding roll, a slitting device for cutting the polarizing plate, the defect inspection by the automatic failure inspection machine is completed according to the width direction size of the panel may be further included. The slitting device may be a laser cutting machine for cutting the polarizing plate using a laser.

Before the polarizing plate is attached to the panel, it may further include an automatic defect checker for checking whether the mark by the automatic failure inspector is marked on the polarizing plate traveling by the traveling roller. Here, the automatic failure checker may be an automatic failure detection sensor capable of sensing the marked mark when the mark is marked on the polarizer. The automatic defect checker may be installed at a distance from the winding roll and may be positioned on an upper side of the driving polarizer. In more detail, the automatic failure checker may be positioned at an upper side with a spaced interval from the driving polarizer.

After checking whether the mark is marked on the polarizing plate through the automatic defect checker, the half cutting machine may further include half cutting the half of the polarizing plate according to the longitudinal size of the panel. The half cut machine may be a laser half cut machine that cuts using a laser. The half-cutting machine may be disposed between the auto-failure popularity and the attachment roller and positioned above the polarizing plate that is driving.

When the release film is attached to the polarizing plate traveling by the traveling roller, when the polarizing plate is attached to the panel, the release film separator for separating the release film from the polarizing plate may further include. The release film separator may be provided adjacent to the attachment roller.

It may further include a release film winding roll for winding the release film separated by the release film separator. The release film winding roll may be installed at a spaced interval from the release film separator. And between the release film winding roll and the release film separator may be provided with a traveling roller for guiding the running of the release film.

The apparatus may further include a panel supply device for transferring the panel to which the polarizing plate is attached and continuously supplying new panels. Here, the panel supply device may be provided in the form of a conveyor belt, but is not limited thereto, and may be applied to any device surface capable of transporting panels in the art. The panel supply device may be provided adjacent to the attachment roller.

The traveling roller may be provided in plurality in order to guide the traveling of the polarizing plate and the traveling of the release film separated from the polarizing plate. The number of the running rollers can be variously adjusted according to the design conditions.

The attachment rollers may be provided in a pair with a spaced interval, and the polarizer may be attached to the attachment surface of the panel while the polarizer and the panel pass between the pair of attachment rollers.

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

FIG. 1 is a view illustrating a manufacturing process of a polarizing plate attached to a panel, and a manufacturing process of the polarizing plate will be described with reference to FIG. 1.

As shown in Figure 1, the manufacturing process of the polarizing plate, ① as a pretreatment step of the triacetyl cellulose (TAC) film which is a transparent protective film, pre-treating two TAC films with NaOH to enhance the hydrophilicity of the TAC film; ② drawing a polyvinyl alcohol (PVA) film to prepare a polarizer, and attaching the pretreated TAC film to the upper and lower surfaces of the polarizer; (3) plywood the surface protective film on the TAC film attached to the upper surface of the polarizer, applying an adhesive to attach the release film to the TAC film attached to the lower surface of the polarizer; ④ inspecting the foreign material of the polarizing plate (see FIG. 2) laminated in the order of the surface protection film, the TAC film, the polarizer (PVA), the TAC film, and the release film with an automatic defect inspector and automatically marking the mark at the defective position; And ⑤ cutting the polarizing plate with the laser of the laser slitting device in accordance with the width direction size of the panel to be attached, and winding it on a winding roll. Here, although the polarizing plate may be fixed to the winding roll by using an adhesive when the polarizing plate is wound on the winding roll, the adhesive for fixing the polarizing plate to the winding roll because the polarizing plate is pulled by tension when winding the polarizing plate on the winding roll. Without it, a polarizing plate can be wound and fixed to a winding roll.

3 and 4 illustrate a process of attaching a polarizing plate wound on a winding roll to a panel, and a process of attaching a roll-shaped polarizing plate to a panel will be described with reference to FIGS. 3 and 4.

As shown in Fig. 3 and 4, the process of attaching the polarizing plate to the panel, ① running in one direction using the traveling roller while releasing the polarizing plate wound on the take-up roll; (2) sensing the mark of the polarizing plate that is being driven (a portion of the polarizing plate that has been marked as defective as a result of inspection by the automatic defect inspector during the manufacturing process of the polarizing plate) by an automatic defect checking sensor; ③ cutting the polarizing plate while driving using two half plates except for the release film using a half-cutting machine, and cutting the polarizing plate according to the longitudinal size of the panel; ④ attaching the cut one polarizing plate to the attaching surface of the panel supplied using the attaching roller; (5) attaching the remaining one polarizing plate to the attachment surface of the new panel newly supplied by the panel supplying device after the panel with the polarizing plate is transferred by the panel supplying device; And ⑥ winding the release film separated by the release film separator on a release film winding roll. Through such a single process, the polarizer may be attached only to one surface of the panel, and if the polarizer is to be attached to the other surface of the panel, the panel having the polarizer attached to one surface is inverted by the above process, and thus the panel is not attached to the polarizer. The other side of the can be raised up, and can be transferred back to this process.

3 and 4, in step ② of the present invention, unlike a part of a part which is inspected by a worker and cut by a set model size, the part is not cut out according to the present invention. As the automatic inspection method using the automatic defect checker is adopted, and the automatic defect checking sensor recognizes the marked portion in the automatic defect inspection and cuts only that portion, it is easy to remove the defective portion and reduce the defective rate. Will be.

In general, the main defects in the polarizing plate are two methods, a detection method using reflection of light and a method of inspection by transmission. In the past, all inspections are performed by humans. However, in the automatic defect inspection apparatus according to the present invention, the two inspection modes are inlined, the camera is installed at the position where the detection is best, the two reflections and transmissions are detected, and the automatic marking is performed at the rear position at the rear end. It is detected by the automatic failure detection sensor of two-panel (ROLL-TO-PANEL, RTP) process. Here, the measuring principle of the automatic defect inspector is empirically experimented to recognize the brightness standard for the detection of a specific defect in the machine, it is a principle that recognizes the brightness beyond the line as bad.

As described above, as a person conducts a total inspection of all the defective polarizers with the naked eye, the problem of inspection error and increase in labor cost according to the difference in detection power between people can be solved by using the automatic defect tester in the present invention. Will be.

Cutting the polarizing plate with a laser in accordance with the width direction of the panel to be attached, and cutting the polarizing plate into two polarizing plates except for the release film using a half-cutting machine. The burr generated on the cross section may flow between the panel and the film by static electricity or airflow when the panel is attached, and may cause a foreign material defect. However, in the step of cutting the polarizing plate with a laser in accordance with the width direction size of the panel to be attached, and cutting the polarizing plate into two polarizing plates except for the release film using a half-cutting machine, cutting and using a laser By cutting, since there is no occurrence of a burr after cutting, foreign material defects can be suppressed.

In addition, unlike the conventional art, in which a polarizing plate can be attached to a panel through a complicated and large number of processes, according to the present invention, as a continuous process using a roll, the polarizing plate is attached to a panel by a roll-to-panel process, and By applying a turret method to the polarizing plate, continuous roll replacement is possible, thereby reducing the number of processes and improving productivity, thereby reducing manufacturing costs.

1 is a view showing a manufacturing process of a polarizing plate according to the present invention.

FIG. 2 is a view illustrating a polarizing plate manufactured by the manufacturing process of FIG. 1.

3 and 4 are views illustrating an attachment process for attaching a polarizing plate to a panel according to the present invention.

Claims (25)

a) driving in one direction while releasing the polarizing plate wound on the take-up roll; And b) when the traveling polarizer reaches a position adjacent to the attaching surface of the panel, attaching and stacking the polarizing plate on the attaching surface of the panel, Before the step a), manufacturing the polarizing plate; And winding the manufactured polarizing plate on the winding roll to prepare the winding roll on which the polarizing plate is wound. The manufacturing of the polarizer may include preparing a polarizer; Attaching a pair of transparent protective film to the polarizer such that the polarizer is positioned between the pair of transparent protective film; And attaching a release film to an outer surface of any one of the pair of transparent protective films, After the step of attaching the release film, and inspecting the defect of the polarizing plate, and if a defect occurs in the polarizing plate further comprises an automatic defect inspection step of marking a mark in the defective position of the polarizing plate, And a slitting step of cutting the polarizing plate according to the width direction size of the panel after the automatic defect inspection step. delete delete The method of claim 1, wherein in the preparing of the polarizer, a polyvinyl alcohol (PVA) -based film is stretched. The method of claim 1, further comprising pretreating the transparent protective film to enhance hydrophilicity of the transparent protective film before attaching the transparent protective film to the polarizer. The method of claim 1, wherein the transparent protective film is a triacetyl cellulose (TAC) film. The method of claim 1, further comprising attaching a surface protective film to an outer surface of the other transparent protective film of the pair of transparent protective films. The method of claim 7, wherein the pair of transparent protective films are disposed between the surface protection film and the release film and the polarizers are simultaneously positioned between the pair of transparent protective films. delete delete The method of attaching a polarizing plate according to claim 1, wherein the polarizing plate is cut and the cut polarizing plate is wound on the winding roll. The method of claim 1, wherein before the step b), the automatic defect checking step of checking a defect of the polarizing plate, and if there is a mark marked in the automatic defect checking step, the automatic defect checking to check the defect by detecting the mark The method of attaching a polarizing plate further comprising. The method of claim 12, further comprising half cutting the polarizing plate into two pieces according to the longitudinal size of the panel after the automatic failure checking step. The method of claim 13, wherein in the step b), one of the two half-cut polarizing plates is attached to and laminated on the attaching surface of the panel. The method according to claim 14, wherein the panel is attached to the polarizing plate is transferred to the next process while the new panel without the polarizing plate is continuously supplied to step b), The panel with one polarizer attached to one of the two half-cut polarizing plates is transferred to the next process, and the remaining one polarizer is attached to the new panel. The method of claim 1, wherein the panel having the polarizer attached to one surface in step b) is resupplyed to step b) so that the polarizer is attached to the other surface. The release film is attached to the polarizing plate of step a), The release film is separated from the polarizing plate attached to the panel in the step b) is a method of attaching a polarizing plate is wound on a release film winding roll. An unwinder on which a winding roll on which a polarizing plate is wound is mounted; A traveling roller for driving the polarizing plate released from the unwinder in one direction; And When the polarizing plate traveling by the traveling roller reaches a position adjacent to the mounting surface of the panel, and includes an attachment roller for attaching the polarizing plate to the mounting surface of the panel, Before winding the polarizing plate on the take-up roll, and inspecting the defect of the polarizing plate, and if the defect occurs in the polarizing plate further comprises an automatic defect inspection machine for marking a mark in the defective position of the polarizing plate, And a slitting device for cutting the polarizing plate on which the defect inspection by the automatic defective inspection machine is completed to the width direction size of the panel before winding the polarizing plate to the winding roll. delete delete 19. The apparatus of claim 18, further comprising an automatic defect checker for checking whether a mark by the automatic failure inspector is marked on the polarizing plate traveling by the traveling roller before the polarizing plate is attached to the panel. . The apparatus of claim 21, further comprising a half-cutting machine for half-cutting the polarizing plate into two pieces according to the longitudinal size of the panel after checking whether the mark is marked on the polarizing plate through the automatic defect checker. Attachment device for polarizing plate. The method according to claim 18, wherein the release film is attached to the polarizing plate traveling by the traveling roller, And a release film separator provided adjacent to the attachment roller to separate the release film from the polarizing plate when the polarizing plate is attached to the panel. 24. The apparatus of claim 23, further comprising a release film winding roll for winding the release film separated by the release film separator. 19. The apparatus of claim 18, further comprising a panel supply device for transferring the panel with the polarizing plate attached thereto and continuously supplying the new panel.

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