KR102437197B1 - A method for punching a polarizing plate, and a punching device used for the method - Google Patents

Abstract

A polarizing plate punching method capable of preventing cracking and punching out the polarizing plate pieces of various shapes is provided.
The punching method of the polarizing plate of the present invention includes punching the polarizing plate with a corrosive blade type or a chipping blade type to obtain a polarizing plate piece having a predetermined shape, and the outline of the polarizing plate piece is composed of a line including a curve. In one embodiment, the ratio of the said curve is 10 % or more with respect to the total length of the line which comprises the outer edge of the said polarizing plate.

Description

A method for punching a polarizing plate, and a punching device used for the method

The present invention relates to a method for punching a polarizing plate and a punching device used for the method.

Conventionally, a polarizing plate is used for an image display apparatus etc., The polarizing plate piece which cuts out from the polarizing plate manufactured on a large area and has a shape according to a use is applied to an image display apparatus. Generally, when cutting out a polarizing plate piece, the punching means provided with a Thompson blade is employ|adopted. The punching means provided with a Thompson blade arrange|positions a some blade in the formwork corresponding to the shape of a polarizing plate piece, and is comprised.

On the other hand, in recent years, the use of an image display apparatus is diversifying, and the shape of the polarizing plate used for the said image display apparatus is also diversifying. For example, in an in-vehicle image display apparatus (for example, the image display apparatus used for an instrument panel) etc., the polarizing plate (polarizing plate piece) in which the outer edge was comprised with the curved line may be used. Corresponding to such diversification of the shape of a polarizing plate piece, establishment of the technique which punches out a polarizing plate piece without a problem is calculated|required.

Japanese Patent Laid-Open No. 2009-56735

As one of the subjects at the time of punching out a polarizing plate piece, prevention of the crack which arises in a polarizing plate (or a polarizing plate piece) is mentioned.

Since the punching means provided with a Thompson blade is comprised from a plurality of blades, it has a blade joint, but the inventors of this invention discovered that the joint of this blade was a factor of the said crack. In particular, when punching out a polarizing plate piece having a curved portion, it was found that cracks occur at high frequency when the joint of the blade is located in the curved portion.

This invention was made in order to solve the said conventional subject, The main objective is to prevent generation|occurrence|production of a crack, and to provide the punching method of a polarizing plate which becomes possible to punch out the polarizing plate piece of various shapes.

The method for punching a polarizing plate of the present invention includes punching a polarizing plate with a corrosive blade type or a chipping blade type to obtain a polarizing plate piece having a predetermined shape, and the outline of the polarizing plate piece is composed of a line including a curve.

In one embodiment, the ratio of the said curve is 10 % or more with respect to the total length of the line which comprises the outer edge of the said polarizing plate.

In one Embodiment, the outer edge of the said polarizing plate piece is comprised only with a curve.

In one embodiment, the said polarizing plate piece is circular shape or elliptical shape.

According to another aspect of the present invention, a punching device is provided. This punching device is a punching device used for the punching method of the said polarizing plate, Comprising: A corrosion-blade type|mold or a chipping-blade type|mold is provided.

ADVANTAGE OF THE INVENTION According to this invention, the generation|occurrence|production of a crack is prevented and the punching method of a polarizing plate which becomes possible to punch out the polarizing plate piece of various shapes by punching a polarizing plate with a corrosion blade type or a chipping blade type can be provided.

1 is a schematic perspective view of a corrosion blade type used in an embodiment of the present invention.
2 is a schematic partial cross-sectional view of a corrosion blade type used in an embodiment of the present invention.
It is a schematic diagram explaining the punching method of the polarizing plate of this invention by one Embodiment.
It is a schematic diagram explaining the punching method of the polarizing plate of this invention by another embodiment.

A. Punching method of polarizing plate

The punching method of the polarizing plate of this invention includes punching out a polarizing plate with a corrosion-blade type|mold or a chipping-blade type|mold, and obtaining the polarizing plate piece of a predetermined shape. The corrosion blade type (so-called pinnacle blade type, pinnacle die (registered trademark)) is a blade type composed of a corrosion blade formed from a metal plate by an etching method. The cutting blade type is a blade type composed of a cutting blade formed by cutting from a metal plate. Corrosion blade type or piece blade type is characterized in that it is configured without a seam. In this invention, generation|occurrence|production of the crack which arises in a polarizing plate and a polarizing plate piece can be prevented by punching out a polarizing plate with the punching means provided with a corrosion blade type or a chipping blade type. Moreover, in the Thompson blade type which has been used conventionally, the joint of the blade exists, and the blade shift|deviates minutely at the joint, and it is estimated that the shift|offset|difference becomes a trigger by the impact at the time of punching, and a crack arises. In addition, when there is a joint of the blade in the curved portion of the Thompson blade type, the deviation of the blade tends to become large due to the stress that the blade tends to open outward. The problem is expected to become significant. Hereinafter, the punching method of the present application will be described using a corrosion blade type as a representative example.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view of the corrosion-blade type|mold used for one Embodiment of this invention. Moreover, FIG. 2 is a schematic partial sectional drawing of the corrosion-blade type|mold used for one Embodiment of this invention. The corrosion blade type 100 is composed of a blade portion 10 and a base portion 20 . The blade part 10 prescribes|regulates the punching part 11 corresponding to the shape of a polarizing plate piece in planar view. On the corrosive blade type 100, it is preferable that the punching part 11 exists in multiple numbers.

The form used in the shape of a flat plate may be sufficient as a corrosion blade type, and the form used in roll shape may be sufficient as it.

The blade height (height A in FIG. 2) of the corrosion blade type becomes like this. Preferably they are 0.3 mm - 10 mm, More preferably, they are 0.35 mm - 6 mm.

The blade depth (height B in Fig. 2) of the corrosion blade type is preferably 0.1 mm to 4.5 mm, more preferably 0.2 mm to 2 mm.

The thickness (thickness C in FIG. 2) of the corrosion-blade-shaped base part becomes like this. Preferably they are 0.1 mm - 5.5 mm, More preferably, they are 0.13 mm - 2 mm.

The corrosive blade type blade angle (angle D in FIG. 2 ) is preferably 15° to 80°.

The corrosion blade type Rockwell hardness (HRC) is preferably 40° to 80°, more preferably 45° to 70°. Rockwell hardness (HRC) can be measured by a method based on JIS Z 2245.

The space|interval of the adjacent punching part becomes like this. Preferably they are 0.5 mm - 5 mm, More preferably, they are 1 mm - 3 mm. According to this invention, since generation|occurrence|production of a crack can be prevented, a punched part can be formed densely, and a polarizing plate piece can be obtained with a favorable yield.

It is a schematic diagram explaining the punching method of the polarizing plate of this invention by one Embodiment. In this embodiment, the punching means 300 which attaches the said corrosion blade type|mold (plate-shaped corrosion blade type) 100 to the base plate 200, and is comprised is used. In this embodiment, after conveying the polarizing plate 500 onto the cutting plate 400 arranged below the punching means 300, the punching means 300 is moved downward toward the polarizing plate 500, or Alternatively, the polarizing plate 500 is punched out and a polarizing plate piece of a predetermined shape is obtained by moving the cutting plate 400 upward toward the punching means 300 and bringing the corrosion blade type 100 into contact with the polarizing plate 500 . .

It is a schematic diagram explaining the punching method of the polarizing plate of this invention by another embodiment. In this embodiment, the punching means 300' comprised as a roll-shaped rotary blade by affixing the said corrosion blade type|mold 100 to the surface of the 1st roll 600 is used. In this embodiment, the polarizing plate 500 is punched out, and the polarizing plate 500 is punched out by rotating the punching means 300' and the 2nd roll 700 which receives the corrosion blade type together, and passing the polarizing plate 500 between the said rolls. A polarizing plate piece 510 of In this embodiment, a conveyance base material can be arrange|positioned on the 2nd roll side of a polarizing plate (not shown). The gap between the first roll and the second roll, and the blade height and depth of the corrosive blade type can be adjusted so as not to cut the conveyed substrate in full. By adjusting in this way, a polarizing plate piece can be conveyed by a conveyance base material to a following process.

A long shape may be sufficient as the polarizing plate provided for punching|punching, and the sheet shape may be sufficient as it. Preferably, it is elongate. In the embodiment shown in FIG. 3 , when a long polarizing plate is used, after the to-be-processed part is conveyed onto the cutting plate, the conveyance is stopped once and the punching process is performed as described above, and after the completion of one punching process, the next A series of operations of conveying the part to be punched to the cutting plate and performing the next punching process is repeated, so that all of the elongated polarizing plate is subjected to the punching process. Moreover, in embodiment shown in FIG. 4, when using a long polarizing plate, all the long polarizing plates are provided for punching by passing a polarizing plate between the punching means and 2nd roll which are continuously rotating together.

The polarizing plate piece obtained by punching may be arbitrary suitable shapes. In one embodiment, the outline of a polarizing plate piece is comprised by the line containing a curve. The Thompson blade type conventionally used has a blade joint, and when punching is performed with a Thompson blade type, it originates in the joint and there exists a problem that a crack is easy to produce. In particular, in the polarizing plate piece which has a curved part, when the joint of the said blade is located in a curved part, a crack will arise with high frequency. On the other hand, in the present invention, cracks can be prevented not only in the conventional punching of a rectangular polarizing plate piece but also in the punching of a polarizing plate piece having a curved portion.

In one embodiment, in the said polarizing plate piece, the ratio of a curve is 10 % or more with respect to the full length of the line which comprises the outer edge of the said polarizing plate. In one embodiment, in the said polarizing plate piece, the ratio of a curve is 30 % or more with respect to the full length of the line which comprises the outer edge of the said polarizing plate. In one embodiment, in the said polarizing plate piece, the ratio of a curve is 50 % or more with respect to the full length of the line which comprises the outer edge of the said polarizing plate. In one embodiment, in the said polarizing plate piece, the ratio of a curve is 70 % or more with respect to the full length of the line which comprises the outer edge of the said polarizing plate. ADVANTAGE OF THE INVENTION According to this invention, the polarizing plate piece with a high curve ratio can be punched out without a crack.

In one embodiment, the outer edge of the said polarizing plate piece is comprised only with a curve. Moreover, the outer shell of the said polarizing plate may be comprised by the free curve.

In one Embodiment, the radius of curvature of the said curve is 900 mm or less. In one Embodiment, the radius of curvature of the said curve is 600 mm or less. In one Embodiment, the radius of curvature of the said curve is 300 mm or less. In one Embodiment, the radius of curvature of the said curve is 150 mm or less. In one Embodiment, the radius of curvature of the said curve is 100 mm or less. ADVANTAGE OF THE INVENTION According to this invention, the polarizing plate piece containing a curve with a small radius of curvature can be punched out without a crack.

In one embodiment, the said polarizing plate piece is circular shape or elliptical shape. The circular shape is a concept including a substantially circular shape, and the elliptical shape is a concept including a substantially elliptical shape.

In one embodiment, when the said polarizing plate is circular, the radius R of this polarizing plate is 900 mm or less. In one embodiment, when the said polarizing plate is circular, the radius R of this polarizing plate is 600 mm or less. In one embodiment, when the said polarizing plate is circular, the radius R of this polarizing plate is 300 mm or less. In one embodiment, when the said polarizing plate is circular, the radius R of this polarizing plate is 150 mm or less. In one embodiment, when the said polarizing plate is circular, the radius R of this polarizing plate is 100 mm or less. ADVANTAGE OF THE INVENTION According to this invention, the circular polarizing plate piece with a small radius R can be punched out without a crack.

B. Punching device

The punching apparatus of this invention is an apparatus used for punching|punching of a polarizing plate, Comprising: It is equipped with a corrosion-blade type|mold or a chipping-blade type|mold. As the corrosion blade type or the chipping blade type, the blade type described in section A above is used. In particular, the corrosion blade type is lightweight, and in the punching device of the present invention, the mechanism for operating the punching means provided with the corrosion blade type can be simplified. In addition, the corrosion blade type is advantageous also in terms of cost.

In one embodiment, the punching device of the present invention is, as shown in FIG. 3 , punching means configured by attaching the above-mentioned corrosion blade type (flat corrosion blade type) 100 (or chipping blade type) to the base plate 200 . (300) and the cutting plate 400 which is arrange|positioned opposite to the punching means 300, and receives the corrosion-blade type|mold 100 (or a piece-blade type|mold) at the time of punching.

According to the punching device of this embodiment, after placing a polarizing plate as a to-be-processed object on the cutting plate 400, the punching means 300 is moved downward toward the cutting plate 400, or the cutting plate 400 ) is moved upward toward the punching means 300 , and the corrosive blade type 100 (or chipping blade type) is brought into contact with the polarizing plate 500 , whereby the polarizing plate can be punched out. Any suitable means may be employed as the punching means and/or the means for moving the cutting plate.

In another embodiment, the punching device of the present invention, as shown in FIG. 4 , attaches the corrosion blade type 100 (or a chipping blade type) to the surface of the first roll 600, and is configured as a roll-shaped rotary blade A punching means 300' and a second roll 700 arranged adjacent to the punching means 300' and receiving the corrosion blade type 100 (or a chipping blade type) are provided. As a method of affixing an erosion blade type|mold or a chipping blade type|mold to a 1st roll, the method of using a magnet roll as a 1st roll and sticking by magnetic force is mentioned, for example. As the second roll, an elastic roll may be used.

According to the punching device of this embodiment, between the first roll 600 (that is, the punching means 300') and the second roll 700 which are rotating together, the polarizing plate is punched by passing the polarizing plate which is a to-be-processed object. can As the means for rotating the first roll and the second roll, any suitable means may be employed. Further, the gap between the first roll and the second roll can be adjusted to any suitable gap according to the thickness of the polarizing plate as the work piece and the height of the corroded or chipped blade. As the means for adjusting the gap, any suitable means may be employed.

The above punching device can be used in combination with any suitable conveying device for conveying the workpiece (eg, conveying belt, conveying roll, etc.), any suitable removing device for removing punched waste after punching, and the like.

Example

Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by these Examples.

[Example 1]

As shown in FIG. 1 , a blade portion (radius of curvature of the curved portion: 41 mm, length of a straight portion: 22 mm) formed of a corrosion blade on a base portion (300 mm × 200 mm), an interval between blade portions: 2 mm, blade depth: 3 mm), the polarizing plate was punched out using the blade shape provided with a plurality. In addition, as a polarizing plate, the polarizing plate (thickness: 219 micrometers) comprised with the polarizer ("NZD-UFQAMEGQ1773VDUHC-ACJ" by Nitto Denko Co., Ltd.) and a protective film ("PPF-100T" by Nitto Denko Co., Ltd.) was used.

The polarizing plate punched out by the blade was subjected to a heat shock test, and as a result of visually confirming the polarizing plate after the test, cracks of 0.5 mm or more in length from the outer edge of the polarizing plate were not recognized in any of the polarizing plates.

The conditions of the heat shock test were 100 cycles of a heat cycle of -40°C (30 minutes)→85°C (30 minutes)→-40°C (30 minutes).

[Comparative Example 1]

In the same manner as in Example 1, that is, in the base portion (300 mm × 200 mm), except for using a blade portion composed of a Thompson blade having a seam in a straight portion instead of a corrosion blade, a blade portion composed of the Thompson blade (curved curve) The same polarizing plate as in Example 1 was punched out using the blade shape provided with a plurality of negative radius of curvature: 41 mm, the length of the straight portion: 22 mm, the distance between the blades: 2 mm, and the blade depth: 3 mm).

As a result of subjecting the polarizing plate punched out by the said blade to the same test as Example 1, the polarizing plate in which the crack of length 0.5 mm or more arose from the outer edge of a polarizing plate was confirmed.

[Comparative Example 2]

In the same manner as in Example 1, that is, in the base portion (300 mm × 200 mm), except that a blade portion composed of a Thompson blade having a seam in the curved portion was used instead of the corrosion blade, that is, a blade portion composed of the Thompson blade (curved curve) The same polarizing plate as in Example 1 was punched out using the blade shape provided with a plurality of negative radius of curvature: 41 mm, the length of the straight portion: 22 mm, the distance between the blades: 2 mm, and the blade depth: 3 mm).

As a result of subjecting the polarizing plate punched out by the said blade to the same test as Example 1, the polarizing plate in which the crack of length 0.5 mm or more arose from the outer edge of a polarizing plate was confirmed.

10: blade
20: base part
100: corrosion blade type

Claims (5)

Punching the polarizing plate by a corrosion blade type or a chipping blade type to obtain a polarizing plate piece of a predetermined shape,
The corrosion blade type and the chipping blade type have a blade part defining a punching part, and a plurality of the blade parts exist,
The outer edge of the polarizing plate piece is composed of a line including a curve,
A method of punching a polarizing plate. The method of claim 1,
A method for punching a polarizing plate, wherein the ratio of the curve is 10% or more with respect to the total length of the lines constituting the outer periphery of the polarizing plate. The method of claim 1,
A method for punching a polarizing plate, wherein the periphery of the polarizing plate piece consists only of a curve. The method of claim 1,
The punching method of the polarizing plate whose said polarizing plate piece is circular shape or elliptical shape. As a punching device used for the punching method of the polarizing plate in any one of Claims 1-4,
A corrosive blade type or a chipping blade type is provided, wherein the corrosion blade type and the chipping blade type have a blade portion defining a punching portion, and a plurality of the blade portions exist, a punching device.

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