JP2000284269A - Method for cutting polarizing plate for liquid crystal cell and method for adhering the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a production cost by cleanly finishing cut surfaces without the occurrence of interlayer peeling in cutting of polarizing plates of a multilayered film structure and permitting continuous automatic work from cutting to liquid crystal cell adhesion. SOLUTION: A rectangular strip-like polarizing plate roll 20 which is formed by placing a large sheet of a polarizing plate on a stage 2 provided with a hollow groove part 2a, cutting the sheet to a rectangular shape, connecting the cut sheets by an adhesive tape 10a and taking up the connected sheet to a roll form is loaded to the device. The delivered rectangular strip-like polarizing plate 1B is cut to the polarizing plate 1 of one-piece shape by the hollow groove part 2a of the stage 2 formed with the hollow groove part 2a and is simultaneously stuck to the adhesive tape 10a delivered at a prescribed speed by a tape take-up roll 12. The polarizing plate is then moved to the prescribed position of a polarizing plate attraction plate 16 and is attracted to this attraction plate 16. The attraction plate 16 attracting the polarizing plate 1 is moved onto a liquid crystal cell 18 and while the attraction plate 16 is inclined and transversely moved, the polarizing plate 1 is adhered by the roller disposed at the attraction plate 16 is brought into pressurized contact with the surface of the liquid crystal cell 18 and is thus adhered thereto. Interlayer peeling does not occur and the stages from one-piece cutting to cell adhering are continuously automated, by which a cost reduction is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a polarizing plate for a liquid crystal cell and a method for bonding the same.

[0002]

2. Description of the Related Art Conventionally, TN type liquid crystal cells and STN type liquid crystal cells are used by attaching polarizing plates to both outer surfaces of upper and lower glass substrates. The polarizing plate includes a polarizing plate using an absorption polarizing plate on both sides, an absorption polarizing plate on the upper side, and a reflecting polarizing plate on the lower side. Here, the absorption-type polarizing plate has a single-layer structure in which a polarizing element is sandwiched between two films, and has a function of transmitting and absorbing light. It has the function of transmission and reflection of light. Here, the multilayer structure of the reflection-type polarizing plate mainly includes a three-layer structure of a polarizing plate, a retardation plate, and a cholesteric film, and the retardation plate and the cholesteric film have a multilayer structure. This reflective polarizing plate having a multilayer structure has a total thickness of about 130 μm formed by laminating very thin thin films of nearly 100 layers, and is capable of obtaining a metallic color reflection color. In addition, the polarizing plate for the liquid crystal cell is large (about 33
(0x550 mm) specifications are cut into the respective product sizes and are usually used.

FIGS. 3 to 5 show a conventional method for cutting a polarizing plate for a liquid crystal cell, and FIG. 3 is a front view showing a cutting state of a polarizing plate on a mounting table provided on a moving table. FIG. 4 is a front view showing a state of delamination at the time of cutting the polarizing plate, and FIG. 5 is a front view showing a state of being cut by pressing a cut portion with a rubber plate.

In FIG. 3, a cutting method is as follows. A large-sized polarizing plate 1A is fixed on a mounting table 2 made of a flat PVC plate or the like, and the polarizing plate 1A is mounted on a moving table 3 of the cutting device for each mounting table 2. The cutter 4 having a thickness of about 0.25 mm and a cutting edge angle of about 30 degrees, for example, is pressed down and cut while moving the polarizing plate 1A.

Here, usually, the absorption type polarizing plate is a cutter 4.
However, since the reflective polarizing plate has a multilayer film structure as described above, when the cutter 4 is pressed and cut, as shown in FIG. Will occur. This is because, when the cutter 4 having the tip cutting edge angle is pushed down, the cut layer is pushed to both sides and a phenomenon that swells to both sides occurs.
This is due to delamination of the layer.

For this reason, as shown in FIG. 5, a method of cutting a reflective polarizing plate having a multilayer film structure is to cut while pressing the rubber plate 5 having a V-shaped cross section on both upper surfaces of the cut portion. I have.

Therefore, first, the cut portion is cut into strips while being held by the rubber plate 5, and then the mounting table 2 on which the strip-shaped polarizing plate 1B is mounted is rotated by 90 degrees and moved in the same manner. The method of cutting one piece at a time is performed.

FIG. 6 is an explanatory view of a polarizing plate bonding apparatus for a liquid crystal cell for bonding a polarizing plate cut into one shape to a liquid crystal cell.
FIG. 7 is a cross-sectional view of the polarizing plate cut into one piece.
In FIG. 6, an adhesive device for a polarizing plate for a liquid crystal cell includes an adhesive tape roll 11 having an adhesive tape 10 wound on one end.
And a tape winding roll 12 for winding the adhesive tape 10 at a predetermined speed at the other end. Adhesive tape 10 from the adhesive tape roll 11
The first table 13 that guides and further transports the polarizing plate 1 is intermittent on the way, and during the intermittent operation, a single-shaped polarizing plate 1 described below is placed above the adhesive tape 10 with the adhesive tape 10 interposed therebetween.
A chute 14 for stacking (releasing the release film on the lower side) and storing it is arranged. The adhesive tape 13 is sent to the lower side of the adhesive tape 10 at a predetermined speed just below the chute 14, and at the same time, the lowermost polarizing plate 1
An up-and-down drive roller 15 that moves up and down in order to affix the tape to the adhesive tape 10 is disposed.

As shown in FIG. 7, a release film 1b is bonded to the lower surface of the polarizing plate 1 with an adhesive 1a.

Next, the polarizing plate 1 affixed on the adhesive tape 10 is conveyed through the first table 13 in the direction of arrow A. The polarization plate of the vacuum suction device provided at the end of the first table 13 is used. Only the polarizing plate 1 is sucked by the plate suction plate 16, and the release film 1 b is wound on the tape winding roll 12 in a state of being stuck on the adhesive tape 10.

The polarizing plate 1 sucked by the polarizing plate sucking plate 16 is a liquid crystal cell 1 set on a second table 17.
8 move above. Then, the polarizing plate adsorbing plate 16 is lowered to place the polarizing plate 1 on the liquid crystal cell 18 by the bonding method described later.
Glue.

The second table 17 has a plurality of well-known stations such as a liquid crystal cell supply (set), a function of bonding a liquid crystal cell to a polarizing plate, a completion of liquid crystal cell bonding, and a discharge of a bonded cell. It runs repeatedly.

FIG. 8 is an explanatory view showing a method of bonding a polarizing plate to a liquid crystal cell. In FIG. 8, the polarizing plate suction plate 16
Is tilted slightly obliquely, and the polarizing plate 1 is pressed against the upper surface of the liquid crystal cell 18 by the adhesive roller 19 attached to the polarizing plate suction plate 16. Then, the polarizing plate 1 is adhered while being pressed by the adhesive roller 19 by the lateral movement of the polarizing plate suction plate 16 while being inclined.

[0014]

However, the above-mentioned prior art has the following problems.
That is, the polarizing plate having a multilayer structure employs the above-described cutting method and bonding method. In particular, the method of cutting one piece at a time requires a lot of work man-hours and high manufacturing cost because it requires cutting while pressing strongly with a rubber plate, and requires two steps of strip cutting and one piece cutting. Had become. Further, although the delaminated portion of the deflection plate becomes very small, it does not mean that it is completely eliminated.

The present invention has been made in view of the above problems, and has as its object to cut a polarizing plate having a multilayer structure.
An object of the present invention is to provide a method of cutting a polarizing plate for a liquid crystal cell and a method of bonding the liquid crystal cell, which is capable of performing a continuous automatic operation from cutting to bonding of a liquid crystal cell and having a low production cost, with a cut surface in which delamination does not occur.

[0016]

In order to achieve the above object, a method of cutting a polarizing plate for a liquid crystal cell according to the present invention comprises the steps of: mounting a polarizing plate for a liquid crystal cell on a mounting table provided with a groove; And cut at a substantially central portion of the concave groove portion.

Also, a large-sized polarizing plate for a liquid crystal cell to be taken in large numbers is placed on a mounting table provided with a groove, and the large-sized is cut into a strip at a substantially central portion of the groove by a cutter. The polarizing plate cut into a shape is connected by an adhesive tape and wound into a roll, and the connected strip-shaped polarizing plate is placed on a mounting table having a groove formed at an end, and a cutter is formed at a substantially central portion of the groove. , Whereby the sheet is continuously cut into one polarizing plate.

Further, in the method of bonding a polarizing plate for a liquid crystal cell according to the present invention, the strip-shaped polarizing plate wound in a roll shape is provided with a cutter at a substantially central portion of a concave groove portion of a mounting table having a concave groove portion formed at an end. At the same time as cutting into one polarizing plate,
The individual polarizing plate is attached to an adhesive tape sent at a predetermined speed, and further moved to a predetermined position of the polarizing plate suction plate, and after the suction plate is sucked by the suction plate, the suction plate on which the polarizing plate is sucked is placed on the liquid crystal cell. It is characterized in that the polarizing plate is adhered to the liquid crystal cell while being pressed against the liquid crystal cell by a roller provided on the suction plate while moving and tilting and moving the suction plate sideways.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for cutting a polarizing plate for a liquid crystal cell and a method for bonding the same in the present invention will be described below with reference to the drawings. FIG. 1 shows a method for cutting a polarizing plate for a liquid crystal cell according to an embodiment of the present invention, and FIG. 1A is a front view showing a state before cutting a polarizing plate placed on a mounting table. 1
(B) is a front view showing the state just before cutting. In the drawings, the same members as those of the prior art are denoted by the same reference numerals.

In FIG. 1A, a polarizing plate for a liquid crystal cell having a large format (approximately 330 × 550 mm) is cut into respective product sizes and is usually used. For example, a concave groove portion 2a having a groove width of about 2 to 5 mm and a groove depth of about 1.5 to 2 mm is formed on the mounting table 2 used for cutting, and the polarizing plate 1A is mounted on the mounting table 2. The large format is cut into a rectangular shape at the approximate center of the concave groove portion 1 a by the cutter 4.

In FIG. 1B, the polarizing plate 1 is pushed into the groove 1a by the pressing of the cutter 4 and cut. At this time, a force is applied to both sides of the cut portion at the cutting edge angle of the cutter 4 at the time of cutting, but the polarizing plate 1 is cut while escaping to both sides because the polarizing plate 1 has a space for both in the groove. Therefore, the cutting is performed while both side surfaces of the cutting portion are pressed from above. For this reason, a clean cut surface can be obtained without occurrence of delamination between layers.

The large polarizing plate is cut into strips having a predetermined width by the above-described cutting method, and then the strip-shaped polarizing plates are connected with an adhesive tape and wound into a roll. The strip-shaped polarizing plate roll is loaded in a polarizing plate single-piece cutting / liquid crystal cell bonding apparatus described later.

FIG. 2 is an explanatory view of a single polarizing plate cutting / liquid crystal cell bonding apparatus. In FIG. 2, the strip-shaped polarizing plate 1B is connected with an adhesive tape 10a, and the strip-shaped polarizing plate roll 20 wound in a roll shape is disposed at an end of the apparatus. The strip-shaped polarizing plate 1B is pulled out and placed on the mounting table 2 having the concave groove 2a formed at the end, and cut into one piece by the cutter 4. At this time, a part of the cut polarizing plate 1 is adhered and fixed to the adhesive tape 11 sent out from the adhesive tape roll 11.

The polarizing plate 1 cut into a single shape and adhered and fixed to the adhesive tape 10 moves on the first table 13 with the movement of the tape by the tape take-up roll 12, and is disposed at the end of the first table 13. It moves to the polarizing plate suction plate 16 of the installed vacuum suction device. Similarly, the polarizing plate 1 is cut into one piece one after another with a predetermined tact, and the adhesive tape 1 is cut.
It moves in the direction of the polarizing plate attracting plate 16 through 0. This operation is sequentially performed to cut into one shape.

Next, the polarizing plate 1 is sucked by the polarizing plate sucking plate 16 as described in the prior art. The polarizing plate 1 transported to the end of the first table 13 is sucked and lifted by the suction plate. At this time, the release film 1b of the polarizing plate 1 is separated from the adhesive 1a of the polarizing plate 1, and the adhesive 1a is attached to the polarizing plate 1.
It is adsorbed on the adsorbing plate with a attached. On the other hand, the release film 1b is wound on the tape winding roll 12 with the adhesive tape 10 in a state.

Next, the polarizing plate 1 adsorbed on the polarizing plate adsorbing plate 16 is bonded to the liquid crystal cell 18 in the same manner as described in the prior art. The polarizing plate 1 sucked by the polarizing plate suction plate 16 moves above the liquid crystal cell 18 set on the second table 17. Then, the polarizing plate suction plate 16 is lowered to bond the polarizing plate 1 on the liquid crystal cell 18.

The second table 17 has a plurality of well-known stations and has functions such as a cell supply set, a polarizing plate bonding, a standby, and a discharge of a bonded cell, and operates repeatedly at a predetermined timing.

The method of bonding the polarizing plate to the liquid crystal cell is the same as in the prior art, as described with reference to FIG. 8, as shown in FIG. 18 Press the polarizing plate 1 against the upper surface. Then, the polarizing plate 1 is adhered while being pressed by the adhesive roller 19 by the lateral movement of the polarizing plate suction plate 16 while being inclined.

When the bonding of the polarizing plates is completed, the second table is rotated, the next liquid crystal cell is moved to the position where the polarizing plates are bonded, and the bonding operation is sequentially performed. The polarizing plate single-piece cutting / liquid crystal cell bonding apparatus of the present invention performs a continuous automatic operation from the cutting of one polarizing plate to the bonding of the polarizing plate to the liquid crystal cell.

The method of cutting and bonding a polarizing plate having a multilayer structure has been described above, but this method can also be applied to a polarizing plate having a single-layer structure.

[0031]

As described above, according to the method for cutting a polarizing plate for a liquid crystal cell of the present invention, when cutting a reflective polarizing plate having a multilayer structure, delamination does not occur, the cut surface is finely finished, and deflection is performed. The quality of the board is improved.

Further, by the method of bonding a polarizing plate for a liquid crystal cell, the entire process from cutting one shape of the polarizing plate to bonding the polarizing plate to the liquid crystal cell can be continuously and automatically performed, thereby improving productivity. it can.

As described above, the reliability is improved without delamination occurring when the polarizing plate is cut.
Also in the bonding method, it is possible to provide a method of cutting a polarizing plate for a liquid crystal cell and a bonding method thereof, which are manufactured at low cost by continuous automatic work.

[Brief description of the drawings]

FIG. 1 shows a method for cutting a polarizing plate for a liquid crystal cell according to an embodiment of the present invention. FIG. 1 (a) is a front view showing a state before cutting a polarizing plate placed on a mounting table. FIG. 1B is a front view showing a state immediately before cutting.

FIG. 2 is an explanatory view of a single polarizing plate cutting / liquid crystal cell bonding apparatus of the present invention.

FIG. 3 is a front view showing a cutting state of a polarizing plate on a mounting table provided on a conventional moving table.

FIG. 4 is a front view showing a state of delamination at the time of cutting the polarizing plate of FIG. 3;

FIG. 5 is a front view showing a state in which a cutting portion is pressed by a rubber plate and cut in a conventional cutting method.

FIG. 6 is an explanatory view of a conventional polarizing plate bonding apparatus for a liquid crystal cell, which bonds a polarizing plate cut into a single piece to a liquid crystal cell.

FIG. 7 is a cross-sectional view of a polarizing plate cut into single pieces according to the related art and the present invention.

FIG. 8 is an explanatory view showing a method of bonding a polarizing plate to a liquid crystal cell according to the related art and the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 polarizing plate 1A polarizing plate raw material 1B strip-shaped polarizing plate 1a adhesive 1b release film 2 mounting table 2a concave groove portion 4 cutter 10 adhesive tape 11 adhesive tape roll 12 tape winding roll 13 first table 16 polarizing plate suction plate 17 Second table 18 Liquid crystal cell 19 Adhesive roller 20 Strip-shaped polarizing plate roll

Claims (3)

[Claims] 1. A method for cutting a polarizing plate for a liquid crystal cell, comprising mounting a polarizing plate for a liquid crystal cell on a mounting table provided with a groove, and cutting the liquid crystal cell at a substantially central portion of the groove with a cutter. 2. A large-sized polarizing plate for a liquid crystal cell, which is to be taken in large numbers, is placed on a mounting table provided with a groove, and the cutter is cut into a rectangular shape at a substantially central portion of the groove by a cutter. The polarizing plate cut into a shape is connected by an adhesive tape and wound into a roll, and the connected strip-shaped polarizing plate is placed on a mounting table having a groove formed at an end, and a cutter is formed at a substantially central portion of the groove. The method for cutting a polarizing plate for a liquid crystal cell, wherein the polarizing plate is continuously cut into one polarizing plate. 3. A strip-shaped polarizing plate, which is cut into strips and connected with an adhesive tape and wound into a roll, is formed into a single piece by a cutter at a substantially central portion of the recessed groove portion of the mounting table having a recessed groove portion formed at an end. At the same time as cutting into a polarizing plate, the single-shaped polarizing plate is attached to an adhesive tape fed at a predetermined speed, and further moved to a predetermined position of the polarizing plate suction plate, and then absorbed by the suction plate. The liquid crystal is characterized by moving the suction plate that has absorbed the liquid crystal onto the liquid crystal cell, and tilting the suction plate and moving it sideways while pressing the polarizing plate against the liquid crystal cell with the roller provided on the suction plate. A method for bonding a polarizing plate for a cell.