KR101634550B1

KR101634550B1 - Film having Knurling Patterns for Film Anti-derail

Info

Publication number: KR101634550B1
Application number: KR1020080130426A
Authority: KR
Inventors: 김혁전; 김기엽; 손성호; 김기범; 조용균; 정광진; 김영삼; 최준태; 이철호; 황유석; 안지영
Original assignee: 에스케이이노베이션 주식회사
Priority date: 2008-12-19
Filing date: 2008-12-19
Publication date: 2016-06-30
Also published as: KR20100071636A

Abstract

The present invention relates to a film formed with a knurling pattern for preventing derailment of a film, and more particularly, to a film for use in a polarizing plate or an optical compensation film of a liquid crystal display, The present invention relates to a film formed with a knurling pattern for preventing derailment of a film, and unlike a conventional pattern in which the angle of the knurling pattern is simply set at an angle, by controlling the angle of the knurling pattern, It is possible to prevent derailment of the film during transportation and to prevent the film from being twisted or knotted at the time of winding, thereby eliminating the possibility that wrinkles are generated in the film.

Film derailment prevention, knurling, knurling, pattern, forming, angle

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a film having a knurling pattern for preventing film derailment,

The present invention relates to a film formed with a knurling pattern for preventing derailment of a film, and more particularly to a film for preventing film deformation during edge trimming of a film used for a polarizing plate or an optical compensation film of a liquid crystal display To a film formed with a knurling pattern for prevention of film derailment.

The cellulose acylate film has high transparency and mechanical strength, and also has dimensional stability that is not greatly dependent on humidity and temperature. Therefore, it is widely used as a support for an optical material in which such characteristics are required. Normally, cellulose acylate film is prepared by casting a dope made by melting a solvent and a polymer on an endless support.

The thus produced film is wound on a winding roll for convenience of transportation.

At this time, a knurling pattern is formed to prevent the left and right edges of the film, that is, the edge portions, from drying.

Conventional knurling patterns are formed in the shape of a quadrangular pyramid having a top cut or a top cut, and are formed at regular intervals and at a predetermined angle. When the pattern is formed at a certain angle with a certain interval, the tensile force or twist acting on the film acts in a certain direction at the time of edge nulling. If a large number of such patterns are formed, the action force is doubled and the film is deformed. Such a film deformation causes a film delamination because the film is rolled without turning it straight when the film is wound after knurling.

In addition, when the pattern is rolled up at a predetermined angle when winding the film after the knurling, the knurled pattern formed on the edge of the rolled film may be vertically engaged with each other. In this case, when the film is loosened, the knurled pattern that is engaged with the film causes an adhesive force, which results in a problem that the film is not easily loosened and the film is bent or wrinkles are generated.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a knurling pattern for preventing film deviation from being caused by twisting or sticking of a film during winding, Film.

The present invention provides a film having a plurality of knurling patterns 40 formed on edge portions 20 located at left and right edges of a film to prevent derailment of the film during film transfer, A straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 and the vertex located at the lowermost portion and the straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 The angle? Formed by the straight line extending parallel to the longitudinal direction of the film is determined by a straight line connecting the vertex located at the uppermost portion of the other nulling pattern 40 and the vertex located at the lowermost portion and the other nulling pattern 40 ) From the vertex located at the top of the film, and the angle (beta) formed by the straight line parallel to the longitudinal direction of the film, In the two said knurled pattern 40, characterized in that the vertex is located at the top of the point and the lower signaling pattern 40 is located at the bottom of the upper knurled pattern 40 disposed shifted relative to the longitudinal direction of the film.

The nulling pattern 40 is rotated such that a straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 and the vertex located at the lowermost portion is directed to the outside of the edge portion 20.

In addition, the nulling pattern 40 is rotated such that a straight line connecting the vertex located at the top of the one nulling pattern 40 and the vertex located at the lowermost point is directed to the outside of the edge portion 20, The straight line connecting the vertex located at the uppermost portion of the edge portion 40 and the vertex located at the lowermost portion is rotated to face the inside of the edge portion 20.

In addition, the pattern 40 may be any one selected from isosceles triangular pyramids, triangular pyramids, rectangular pyramids, and square pyramids, the top of which is cut off.

In addition, the pattern 40 may be a combination of two or more selected from isosceles triangular pyramids, triangular pyramids, rectangular pyramids, and square pyramids, the top of which is cut off.

In addition, the combination of the patterns 40 is repeated in the same manner in the width direction of the film and the longitudinal direction of the film.

The straight lines of the pattern 40 are spaced apart from each other in parallel with the longitudinal direction of the film 10 at the center of the pattern 40 and the center of the pattern 40 adjacent to the pattern 40, .

According to the present invention, unlike a conventional pattern in which the angles of the knurling patterns are simply made uniform, the angle of the knurling pattern is adjusted to maintain the film in tension during knurling to prevent deformation of the film, And it is possible to eliminate the possibility that wrinkles are generated in the film upon winding. In addition, even in the case of a random pattern, the angle of the pattern is controlled to prevent film derailment and wrinkle generation at the time of knurling, and warpage of the film at the time of winding can be prevented.

Hereinafter, a film formed with a knurling pattern for preventing film deviation from the film according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a view showing a state where a film formed by the method of forming a nulling pattern for preventing derailment of a film according to the present invention is wound, and FIGS. 2 to 5 are plan views showing a knurling pattern for preventing a film derailment according to the present invention .

A plurality of knurling patterns 40 are formed on the edge portions 20 located at the left and right edges of the film 10 in order to prevent the film from being deviated during transport.

At this time, a known method is used to form the pattern, and the film knurled on the edge portion 20 is wound on the winding roll 30.

The knurling pattern 40 forms a random angle unlike a conventional pattern having a simple angle, and the angle of a pattern to be formed is adjusted in the following manner.

The nulling pattern 40 has a polygonal pyramid or polygonal pyramid with its top cut off and is disposed at regular intervals.

A straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 and the vertex located at the lowermost portion and a straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 and parallel to the longitudinal direction of the film The angle? Is in the range of 0 to 45 degrees.

2A and 2B, a straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 and the vertex located at the lowermost portion of the knurling pattern 40 is directed to the outside of the edge portion 20 It is preferable that it is rotated. 2A and 2B are different only in the triangular shape of the nulling pattern 40. FIG.

Further, the angle? With respect to one pattern and the angle? With respect to the adjacent pattern can be the same and can be different from each other.

When the angle? With respect to one pattern and the angle? With respect to the adjacent pattern are the same, the pattern may be similar to a pattern of the same type as that of the conventional method in which one pattern and adjacent patterns have the same shape, The present invention differs from the conventional method in that it controls the angle of the pattern.

In the conventional method, since the nulling patterns are repeated in the same shape, the knurling patterns are squeezed together when the film is wound, so that the film is not loosened when the film is unwound and defects are caused by bending the film when the film is loosened.

In order to solve this problem, the knurling pattern is arranged by adjusting the angle of the pattern so that the knurling pattern satisfies the above-mentioned conditions.

When the knurling pattern is arranged in a form satisfying the above-mentioned condition, it is possible to prevent the film from being deformed by keeping the film tight during the knurling, and it is possible not only to reduce the derailment of the film during transportation, It is possible to eliminate the possibility that wrinkles are generated.

In addition, the nulling pattern 40 is rotated such that a straight line connecting the vertex located at the top of the one nulling pattern 40 and the vertex located at the lowermost point is directed to the outside of the edge portion 20, The straight line connecting the vertex positioned at the uppermost portion of the edge portion 40 and the vertex positioned at the lowermost portion may be rotated so as to face the inside of the edge portion 20. In this case, as shown in FIGS. 3 and 4 (b), a straight line connecting the vertex located at the top of the one nulling pattern 40 and the vertex located at the lowermost point and the vertex located at the top of the nulling pattern 40 The angle α formed by the straight line parallel to the longitudinal direction of the film is determined by a straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 and the vertex located at the lowermost portion, Is preferably larger than an angle (beta) formed by a straight line parallel to the longitudinal direction of the film from the vertex. The knurling pattern 40 is randomly arranged when the angle of the knurling pattern 40 is adjusted under the above-described conditions. Therefore, the stress due to the twisting or the like acting on the edge portion is reduced by the nulling pattern 40, So that it is prevented from acting on the film 10 to prevent the film from being twisted. As a result, it is possible to prevent the film deviation from being caused when the film is wound.

At this time, the pattern 40 may have the same shape as any one selected from a polygonal pyramid or a polygonal truncated pyramid, or one pattern 40 and adjacent patterns 40 may be two or more different combinations.

In FIGS. 1 and 2, the nulling pattern 40 is in the form of a truncated triangular pyramid, and one nulling pattern and the adjacent nulling pattern are arranged in the same shape. In this case, the angle? Formed by one nulling pattern and the angle? Formed by the adjacent nulling pattern may be arranged to be the same, or may be arranged differently.

In FIG. 3, the knurling pattern 40 is in the form of a truncated triangular pyramid, and one knurling pattern and the adjacent knurling pattern are arranged in the same shape, but the vertex located at the uppermost portion of one knurling pattern 40, A straight line connecting the vertexes positioned at the uppermost portion and the vertex positioned at the lowermost portion of the nulling pattern 40 adjacent to the edge portion 20 is rotated by the edge portion 20, As shown in Fig. In this case, the angle of the nulling pattern is controlled so that?>?.

4 shows that the knurling pattern 40 is in the shape of a rectangular prism with the top cut out. In this case, one nulling pattern and the adjacent nulling pattern may be arranged in the same shape as shown in FIG. 3A, and as shown in FIG. 3B, a vertex located at the top of one nulling pattern 40, A straight line connecting the vertexes positioned at the uppermost portion and the vertex located at the lowermost portion of the knurling pattern 40 is rotated in the direction of the edge of the edge portion 20, As shown in Fig. 7A.

5 shows that the knurled pattern 40 is formed with alternating triangular pyramidal shapes and rectangular pyramidal shapes whose upper portions are cut.

In particular, in the case of FIG. 5, the combination of the patterns 40 indicates that the repeated pattern 41 is repeated in the width direction of the film and the longitudinal direction of the film.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a state in which a film formed by a knurling pattern forming method for preventing derailment of a film according to the present invention is wound.

2 to 5 are plan views showing a knurling pattern for preventing film derailment according to the present invention.

Description of the Related Art

10: Film

20: edge portion

30: Winding roll

40: knurling pattern

Claims

A film having a plurality of knurling patterns (40) formed on edges (20) located at left and right edges of a film to prevent derailment of the film during film transfer,

The nulling patterns 40 are arranged at regular intervals,

A straight line connecting the vertex located at the uppermost portion of the nulling pattern 40 and the vertex located at the lowermost portion and an angle α formed by a straight line extending parallel to the longitudinal direction of the film from the vertex located at the top of the nulling pattern 40, Quot;

A straight line connecting the vertex located at the uppermost portion of the other nulling pattern 40 adjacent to the left and right and the vertex located at the lowermost portion and a straight line extending parallel to the longitudinal direction of the film from the vertex located at the uppermost portion of the other nulling pattern 40 Which is different from the angle < RTI ID = 0.0 >

The vertex located at the lowermost portion of the upper knurling pattern 40 and the vertex located at the uppermost portion of the lower knurling pattern 40 are arranged to be shifted with respect to the longitudinal direction of the film in the upper and lower adjacent nulling patterns 40. [ A film formed with a knurling pattern for preventing deviation from a film.

The method according to claim 1,

Wherein the nulling pattern (40) is rotated so that a straight line connecting the vertex located at the uppermost portion of the nulling pattern (40) and the vertex located at the lowermost portion is directed to the outside of the edge portion (20) A film formed with a knurling pattern.

The method according to claim 1,

The nulling pattern 40 is rotated so that a straight line connecting the vertex located at the uppermost portion of the one knurling pattern 40 and the vertex located at the lowermost portion is directed to the outside of the edge portion 20, And a straight line connecting the vertex located at the uppermost portion of the edge portion and the vertex located at the lowermost portion is rotated to face the inside of the edge portion.

4. The method according to claim 2 or 3,

Wherein the pattern (40) has a polygonal pyramid or a polygonal pyramid with an upper portion cut out and has the same shape.

4. The method according to claim 2 or 3,

Wherein the pattern (40) has a polygonal pyramid or a polygonal pyramid with a top cut, and one pattern (40) and adjacent patterns (40) are different from each other in a combination of two or more different.

6. The method of claim 5,

Wherein the combination of the pattern (40) is repeated in the width direction of the film or in the longitudinal direction of the film in a repeated pattern.