JP2011020224A - Method for cutting laminated body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for cutting a laminated body obtaining excellent quality of a cut surface without causing cost and labor even in a film having a low elongation rate of a part of the laminated body (film). <P>SOLUTION: In the method for cutting a laminated body cutting the laminated body by a cutting blade 46, the laminated body including a separator film 12 and a multi-layered membrane 16 laminated over the separator film 12 through an adhesive 14, the multi-layered membrane 16 including a first protection film 18a layered over the adhesive 14, a polarizer 20 laminated over the first protection film 18a, and a second protection film 18b laminated over the polarizer 20; a layered film 10 is cut employing a cutting blade (double-edged specification) having 32° or below cutting edge angle θ as the cutting blade and employing an elastic ball having 50° or above sponge hardness as the elastic ball. It is preferable to set the advancing speed of the cutting blade 46 relative to the laminated film 10 at 50 mm/s or more. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for cutting a laminate in which a laminate in which one or more films are laminated via an adhesive is cut with a cutting jig.

  Recently, methods described in Patent Documents 1 to 3 are known as methods for cutting a laminated body in which one or more films are laminated via an adhesive using a cutting blade.

  The cutting method described in Patent Document 1 provides a method capable of cutting a laminated body composed of a plurality of layers having different elastic moduli with a cutting blade without causing delamination on the cut surface. In this method, in addition to defining the cutting edge of the cutting blade on a vertical surface and an inclined surface having an angle of 15 ° to 40 ° with respect to this surface, the cutting edge has an R shape that is 1/2 or more of the thickness of the material to be cut. Or, the cutting edge is characterized in that it has three C-planes that are ½ or less the thickness of the material to be cut.

  The cutting method described in Patent Document 2 provides a laminate cutting method and a stimulable phosphor plate cutting method in which delamination does not occur. A method for cutting a laminate in which layers having different elasticity are laminated, wherein a cutting blade is inserted from a layer having a smaller elastic modulus. In addition, the cutting blade has an edge angle of 20 ° to 60 °, and the blade surface on the product side is 90 ° ± 5 ° with respect to the photostimulable phosphor plate.

  The cutting method described in Patent Document 3 prevents the product portion from being cracked when cutting a Fresnel lens sheet or the like. That is, the sheet includes a pair of cutting blades facing each other with a sheet to be cut in between, and a cushioning contact member disposed on each side of the one cutting blade, and the pair of cutting blades cut into the sheet. In a sheet cutting machine in which a sheet is applied to a contact member when a sheet is inserted, a contact member having cushioning properties is arranged on both sides of the other cutting blade, and a sheet is cut when a sheet is cut with a pair of cutting blades. Is characterized in that it is held between the front and back by a contact member.

Japanese Patent Laid-Open No. 10-15879 JP 2000-65996 A JP 2002-144282 A

  However, the cutting method described in Patent Document 1 is a technique that is limited to the fact that one side of the blade edge is a substantially vertical surface, and is limited to the use of a blade having this feature, and has low versatility. Moreover, the cut surface of the material on the side cut by the non-vertical surface of the blade is easily damaged, and good quality cannot be obtained.

  In the cutting method described in Patent Document 2, the configuration of the laminate is limited. For example, it cannot be applied to a laminate having three or more layers such as a polarizing plate and having a polarizer having the lowest elastic modulus inside.

  In the cutting method described in Patent Document 3, the configuration of the pair of cutting blades is essential, and there is a problem that the equipment cost increases.

  Further, in Patent Documents 1 to 3, there is no verification that the delamination (delamination) or crack generation rate when the laminate is cut varies greatly depending on the elongation rate of the constituent material of the laminate.

  The present invention has been made in consideration of such problems, and even if a part of the laminate (film) is a film having a low stretch rate, the quality of a good cut surface can be obtained without cost and labor. It aims at providing the cutting method of the laminated body which can obtain.

[1] The method for cutting a laminate according to the first aspect of the present invention is the cutting method for a laminate in which the laminate in which one or more films are laminated via an adhesive is cut by a cutting jig. A cutting blade having a blade edge angle of 32 ° or less is used as a jig, and the approach speed of the cutting blade to the laminated body is set to 50 mm / sec or more to cut the laminated body.

[2] In the first aspect of the present invention, the cutting jig includes the cutting blade, a base supporting the cutting blade, and an elastic body provided on the base adjacent to the cutting blade. As the elastic body, an elastic body having a sponge hardness of 50 ° or more is used.

[3] The method for cutting a laminate according to the second aspect of the present invention is the method for cutting a laminate in which the laminate in which one or more films are laminated via an adhesive is cut by a cutting jig. The jig includes the cutting blade, a base that supports the cutting blade, and an elastic body that is provided on the base adjacent to the cutting blade. A cutting blade having a temperature of not more than 0 ° is used, and an elastic body having a sponge hardness of 50 ° or more is used as the elastic body.

[4] In the second aspect of the present invention, the laminate is cut by setting an approach speed of the cutting blade to the laminate to be 50 mm / sec or more.

[5] In the first and second aspects of the present invention, a cutting blade having a blade edge angle of 23 ° or more and 32 ° or less is used as the cutting blade.

[6] In the first and second aspects of the present invention, as the cutting blade, a processing blade having a mirror-finished blade edge portion is used.

[7] In the first and second inventions, an elastic body having a sponge hardness of 70 ° or more is used as the elastic body.

[8] In the first and second aspects of the present invention, the laminate includes a separator film, the pressure-sensitive adhesive, and the one or more films laminated on the separator film via the pressure-sensitive adhesive. It is characterized by.

[9] In the first and second aspects of the present invention, a multilayer film composed of the one or more films is laminated on the separator film via the adhesive, and the multilayer film is laminated on the adhesive. It has the 1st protective film, the polarizer laminated | stacked on this 1st protective film, and the 2nd protective film laminated | stacked on this polarizer, It is characterized by the above-mentioned.

[10] In the first and second aspects of the present invention, the first protective film and the second protective film are made of triacetyl cellulose, and the longitudinal stretch rate is less than 42% and the lateral stretch rate is 43. It is characterized by being less than%.

  As described above, according to the method for cutting a laminated body according to the present invention, even if a part of the laminated body (film) is a film having a low elongation rate, a good cut surface can be obtained without cost and labor. Can get the quality.

It is sectional drawing which abbreviate | omits and shows the laminated | multilayer film based on this Embodiment. It is a block diagram which shows the cutting device used with the cutting method which concerns on this Embodiment. FIG. 3A is an explanatory view showing a method for cutting a laminated film, and FIG. 3B is a view showing an example of a polarizing plate obtained by cutting, as viewed from above. 4A to 4D are explanatory diagrams showing the progress of the cutting blade entering the laminated film. FIG. 4C shows a cutting state of the laminated film (sample 1) using the TAC film having a high elongation rate, and FIG. The cutting | disconnection condition of the laminated | multilayer film (sample 2) using the TAC film with a low rate is shown.

  Hereinafter, an embodiment in which the method for cutting a laminate according to the present invention is applied to a method for cutting a laminated film for producing a polarizing plate used in a liquid crystal display device or the like will be described with reference to FIGS. explain.

  First, the laminated film 10 according to the present embodiment includes a separator film 12 and a multilayer film 16 laminated on the separator film 12 with an adhesive 14 as shown in FIG.

  As the separator film 12, for example, a film made of polyethylene terephthalate (PET) can be used.

  The multilayer film 16 constitutes a polarizing plate body, and includes a first protective film 18a laminated on the adhesive 14, a polarizer 20 laminated on the first protective film 18a, and the polarizer. 20 and a second protective film 18b stacked on top of each other. The first protective film 18a and the second protective film 18b are each a cellulose acylate film, particularly a TAC film composed of cellulose triacetate (TAC) having an average degree of acetylation of 57.5% to 62.5%. Can do. Moreover, the polarizer 20 can use the film made from polyvinyl alcohol.

  Then, the cutting method according to the present embodiment cuts the laminated film using, for example, a cutting device 30 as shown in FIG. Thereby, for example, a large number of polarizing plates used in a liquid crystal display device or the like are obtained.

  The cutting device 30 includes, for example, a stainless steel feed table 32 on which the laminated film 10 is placed and fixed, a transport mechanism 34 that conveys the feed table 32 in one direction, and a laminated film that is placed and fixed on the feed table 32. 10 and a moving mechanism 38 that moves the cutting jig 36 in the vertical direction. A plastic plate 40 (for example, made of PET) as an underlay is fixed on the feed table 32, and the laminated film 10 is placed and fixed on the plastic plate 40.

  The moving mechanism 38 has a press board 42 and moves the press board 42 in a direction approaching and separating from the laminated film 10 placed and fixed on the feed table 32. A cutting jig 36 is fixed to the lower surface of the press board 42.

  The cutting jig 36 has a base 44 (for example, wooden) fixed to the lower surface of the press board 42 and a cutting blade 46 supported and fixed by the base 44 so that the cutting edge faces downward. An elastic body 48 is installed on the lower surface of the base 44 adjacent to the cutting blade 46. In this case, the protruding amount ta (the length protruding from the base 44) of the cutting blade 46 from the base 44 is set to be smaller than the height tb of the elastic body 48. Accordingly, when the laminated film 10 is cut, the moving mechanism 38 presses the cutting jig 36 against the laminated film 10 so that the elastic body 48 sandwiched between the base 44 and the laminated film 10 is compressed. Due to the elastic deformation, only the cutting blade 46 enters the laminated film 10 and cuts the laminated film 10. Thereafter, when the cutting jig 36 is moved away from the laminated film 10, the elastic body 48 is elastically restored, and the cutting blade 46 is quickly detached from the cutting portion. Therefore, when the cutting blade 46 is pulled out from the laminated film 10, it is suppressed that the surface of the laminated film 10 is deformed, and the adhesive 14 in the laminated film 10 adheres to the cutting edge of the cutting blade 46. Therefore, continuous cutting work can be performed. The shape along the cutting edge of the cutting blade 46 described above (the shape formed by tracing the cutting edge) is linear.

  By the way, when a TAC film is used as the first protective film 18a and the second protective film 18b constituting the laminated film 10, use of a TAC film having a high stretch rate or a TAC film having a low stretch rate can be considered.

  The stretch ratio here is a ratio (percentage) with respect to the original length of the increase in the length of the TAC film at the time of rupture by pulling a TAC film having a width of 20 mm × a length of 100 mm until it breaks, that is, It is a value obtained by {length increased by increasing (increase) / original length} × 100 (%).

  A TAC film having a high stretch rate is a TAC film having a stretch rate in the machine direction (MD) of 42% or more and a stretch rate in the transverse direction (TD: Transverse Direction) of 43% or more, and has a low stretch rate. The TAC film is a TAC film having a longitudinal stretch ratio of less than 42% and a lateral stretch ratio of less than 43%.

  And it turned out that the quality of a cut surface differs greatly when the laminated film 10 using a TAC film having a high elongation rate is cut and when the laminated film 10 using a TAC film having a low elongation rate is cut. .

  The quality of the cut surface can be evaluated by delamination (delamination) generated between the polarizer 20 and the first protective film 18a in the lower layer and the number of cracks generated in any of the multilayer films 16.

  The delamination is the ratio of the length of delamination (delamination) in the direction along the end face (edge) of the polarizing plate obtained by cutting the laminated film 10 to the reference length (50 mm) (hereinafter referred to as the edge direction length ratio). The average value of the length of delamination in the depth direction (inward) per reference length (50 mm) along the end face of the polarizing plate obtained by cutting is measured on a plurality of end faces (hereinafter, It can be evaluated by the depth direction length). The number of cracks can be evaluated by the number of cracks generated on the end face (edge) of the polarizing plate obtained by cutting.

  Here, one experimental example is shown. In this experimental example, as shown in FIG. 3A, a laminated film 10 (sample 1) using a TAC film having a high elongation rate and a laminated film 10 (sample 2) using a TAC film having a low elongation rate are cut. Then, as shown in FIG. 3B, a rectangular polarizing plate was produced when viewed from the top surface having a long side length of 120 mm and a short side length of 30 mm, and the quality of the cut surface of each polarizing plate was measured. Is. In cutting, for example, as shown in FIG. 3A, the entry speed of the cutting blade 46 to the samples 1 and 2 (hereinafter referred to as cutting speed v) is set to 5 mm / sec, and the elastic body 48 (see FIG. 2) is used as a sponge. An elastic body having a hardness of 20 ° was used, and a cutting blade having a blade edge angle θ of 32 ° and a mirror-finished blade edge portion was used as the cutting blade 46. Further, the samples 1 and 2 are placed and fixed on the feed table 32 so that the upper surface of the multilayer film 16 (the upper surface of the second protective film 18b) faces the cutting edge of the cutting blade 46, and the separator is separated from the multilayer film 16 side. The film was cut toward the film 12. The experimental results are shown in Table 1.

  As can be seen from the experimental results in Table 1, the quality of the cut surface of the laminated film 10 (sample 1) using the TAC film having a high stretch rate is 0 in the length direction in the edge direction, 0 mm in the length in the depth direction, and the number of cracks. Was also 0. On the other hand, the quality of the cut surface of the laminated film 10 (sample 2) using the TAC film having a low stretch ratio is 0.21 in the edge direction length ratio, 0.042 mm in the depth direction length, and 29 cracks. there were.

  As described above, the reason why the quality of the cut surface of the laminated film 10 (sample 2) using the TAC film having a low stretch rate is deteriorated is considered to be due to the mechanism shown in FIGS. 4A to 4D.

  That is, first, as shown in FIG. 4A, when the cutting edge of the cutting blade 46 comes into contact with the upper surface of the multilayer film 16 (the upper surface of the second protective film 18b) and the cutting blade 46 is further pushed downward, A cutting load is applied from the blade edge on the upper surface, and the laminated film 10 is compressed and deformed in the thickness direction (bending deformation of “reverse character”).

  Thereafter, as shown in FIG. 4B, when the cutting blade 46 moves further downward, the blade edge bites into the multilayer film 16, cuts the upper second protective film 18 b, and further enters the polarizer 20. At this time, the lower first protective film 18a is compressed and deformed by the cutting edge, and the entire laminated film 10 is deformed in the reverse direction. In particular, when the cutting of the second upper protective film 18b is completed, the cutting edge enters with increased momentum.

  Thereafter, in the laminated film 10 (sample 1) using the TAC film having a high elongation rate, as shown in FIG. 4C, the cutting edge enters the first protective film 18a in the lower layer with a high momentum. At this time, the lower first protective film 18a breaks along the blade edge earlier than cutting by the blade edge.

  On the other hand, in the laminated film 10 (sample 2) using the TAC film having a low stretch rate, as shown in FIG. 4D, the cutting edge enters the first protective film 18a in the lower layer with a quick momentum, but the second protection in the upper layer. Since the load recoil (cutting load) at the time of completion of the break of the film 18b is larger than that of the laminated film 10 (sample 1) using the TAC film having a high elongation rate, the lower first protective film 18a is earlier than the cutting by the blade edge. It breaks diagonally so that it collapses. This causes cracks. That is, in the laminated film 10 (sample 2) using the TAC film having a low elongation rate, it is considered that cracking is likely to occur due to its hard and brittle physical properties when it is broken in a bending deformation state. It is considered that delamination occurs due to the formation of a gap due to a minute sliding of the interlayer adhesion site due to a crack.

  Therefore, even in the laminated film 10 (sample 2) using the TAC film having a low elongation rate, the cut surface quality equivalent to that of the laminated film 10 (sample 1) using the TAC film having a high elongation rate is obtained. By doing so, it is possible to widen the range of selectivity of the TAC film, and for example, it is possible to provide a polarizing plate having optimum characteristics according to the type of the liquid crystal display device.

  In the cutting method according to the present embodiment shown below, even in the case of the laminated film 10 (sample 2) using a TAC film having a low stretch rate, good cut surface quality can be obtained without cost and labor. A cutting method that can.

  In this cutting method, for example, as shown in FIG. 3A, the laminated film 10 is cut from the multilayer film 16 side toward the separator film 12, and as a cutting blade, the cutting edge angle θ is 32 ° or less. Using a blade (double-edged specification), the laminated film 10 is cut using an elastic body having a sponge hardness of 50 ° or more as an elastic body. Preferably, the approach speed of the cutting blade 46 to the laminated film 10 is set to 50 mm / sec or more, and the laminated film 10 is cut.

  Alternatively, the laminated film 10 is cut from the multilayer film 16 side toward the separator film 12, and a cutting blade having a blade edge angle θ of 32 ° or less (double-edged specification) is used as the cutting blade. The laminating film 10 is cut by setting the approach speed of the cutting blade 46 to 50 mm / sec or more.

More preferably, it satisfies any one or more of the following conditions (1) to (3).
(1) As the cutting blade 46, a cutting blade having a blade edge angle θ of 23 ° or more and 32 ° or less is used.
(2) As the cutting blade 46, a processing blade having a mirror-finished blade edge portion is used.
(3) An elastic body having a sponge hardness of 70 ° or more is used as the elastic body.

  The cutting blade 46 preferably has a hardness (Shore hardness) of 40 or more for the body portion and 50 or more for the cutting edge.

  Hereinafter, the present invention will be described more specifically with reference to examples of the present invention. In addition, the material, usage-amount, ratio, processing content, processing procedure, etc. which are shown in the following Examples can be changed suitably unless it deviates from the meaning of this invention. Accordingly, the scope of the present invention should not be construed as being limited by the specific examples shown below.

  In accordance with the cutting method according to the present embodiment, the laminated film 10 is placed on the feed table 32 so that the upper surface of the multilayer film 16 (the upper surface of the second protective film 18b) faces the cutting edge of the cutting blade 46. Fixed and cut toward the separator film 12 from the multilayer film 16 side, as shown in FIG. 3B, a rectangular polarizing plate as viewed from the top with a long side length of 120 mm and a short side length of 30 mm And the quality of the cut surface of each polarizing plate was measured.

(Laminated film 10)
The configuration of various films constituting the laminated film 10 is as follows.
Separator film 12: PET film with a thickness of 40 μm Adhesive 14: Thickness of 30 μm
First protective film 18a: TAC film having a thickness of 40 μm (trade name: Fujitac, manufactured by FUJIFILM Corporation)
Polarizer 20: PVA (polyvinyl alcohol) film having a thickness of 28 μm Second protective film 18b: TAC film having a thickness of 40 μm (trade name: Fujitac, manufactured by Fuji Film)
The stretch ratio of the first protective film 18a and the second protective film 18b is 22% in the longitudinal direction (MD) and 18% in the lateral direction (TD).

(Examples 1-25, Comparative Examples 1-6)
Details of Examples 1 to 25 and Comparative Examples 1 to 6 are shown in Table 2 below. In Table 2, data other than Examples 1 to 25 and Comparative Examples 1 to 6 are shown as reference examples.

(Examples 1-12)
In each of Examples 1 to 12, a standard blade (blade that was not mirror-finished) having a blade edge angle θ of 23 ° was used as the cutting blade 46.

  In Example 1, an elastic body having a sponge hardness of 15 ° was used as the elastic body 48, and the cutting speed v was set to 50 mm / sec. Example 2 was the same as Example 1 except that the cutting speed v was set to 80 mm / sec. Example 3 was the same as Example 1 except that the cutting speed v was set to 105 mm / sec.

  In Example 4, an elastic body having a sponge hardness of 20 ° was used as the elastic body 48, and the cutting speed v was set to 50 mm / sec.

  In Example 5, an elastic body having a sponge hardness of 50 ° was used as the elastic body 48, and the cutting speed v was set to 3.5 mm / sec. Example 6 was the same as Example 5 except that the cutting speed v was set to 14 mm / sec. Example 7 was the same as Example 5 except that the cutting speed v was set to 26 mm / sec. Example 8 was the same as Example 5 except that the cutting speed v was set to 50 mm / sec.

  In Example 9, an elastic body having a sponge hardness of 70 ° was used as the elastic body 48, and the cutting speed v was set to 3.5 mm / sec. Example 10 was the same as Example 9 except that the cutting speed v was set to 14 mm / sec. Example 11 was the same as Example 9 except that the cutting speed v was set to 26 mm / sec. Example 12 was the same as Example 9 except that the cutting speed v was set to 50 mm / sec.

(Comparative Examples 1-4)
In each of Comparative Examples 1 to 4, a standard blade (blade that was not mirror-finished) having a blade edge angle θ of 23 ° was used as the cutting blade 46.

  In Comparative Example 1, an elastic body having a sponge hardness of 15 ° was used as the elastic body 48, and the cutting speed v was set to 5 mm / sec. In Comparative Example 2, an elastic body having a sponge hardness of 20 ° was used as the elastic body 48, and the cutting speed v was set to 3.5 mm / sec. Comparative Example 3 was the same as Comparative Example 2 except that the cutting speed v was set to 14 mm / sec. Comparative Example 4 was the same as Comparative Example 2 except that the cutting speed v was set to 26 mm / sec.

(Examples 13 to 20)
In each of Examples 13 to 20, a cutting blade having a blade edge angle θ of 32 ° and a mirror-finished blade edge portion was used as the cutting blade 46.

  In Example 13, an elastic body having a sponge hardness of 15 ° was used as the elastic body 48, and the cutting speed v was set to 50 mm / sec. Example 14 was the same as Example 13 except that the cutting speed v was set to 80 mm / sec.

  In Example 15, an elastic body having a sponge hardness of 20 ° was used as the elastic body 48, and the cutting speed v was set to 50 mm / sec.

  In Example 16, an elastic body having a sponge hardness of 70 ° was used as the elastic body 48, and the cutting speed v was set to 3.5 mm / sec. Example 17 was the same as Example 16 except that the cutting speed v was set to 5 mm / sec. Example 18 was the same as Example 16 except that the cutting speed v was set to 14 mm / sec. Example 19 was the same as Example 16 except that the cutting speed v was set to 26 mm / sec. Example 20 was the same as Example 16 except that the cutting speed v was set to 50 mm / sec.

(Comparative Examples 5 and 6)
In Comparative Examples 5 and 6, as the cutting blade 46, a cutting blade having a blade edge angle θ of 32 ° and a blade edge portion finished to a mirror surface was used.

  In Comparative Example 5, an elastic body having a sponge hardness of 15 ° was used as the elastic body 48, and the cutting speed v was set to 5 mm / sec. In Comparative Example 6, an elastic body having a sponge hardness of 20 ° was used as the elastic body 48, and the cutting speed v was set to 3.5 mm / sec.

(Examples 21 to 24)
In each of Examples 21 to 24, a cutting blade having a cutting edge angle θ of 23 ° and a mirror-finished cutting edge portion was used as the cutting blade 46.

  In Example 21, an elastic body having a sponge hardness of 70 ° was used as the elastic body 48, and the cutting speed v was set to 3.5 mm / sec. Example 22 was the same as Example 21 except that the cutting speed v was set to 14 mm / sec. Example 23 was the same as Example 21 except that the cutting speed v was set to 26 mm / sec. Example 24 was the same as Example 21 except that the cutting speed v was set to 50 mm / sec.

(Example 25)
In Example 25, a cutting blade having a cutting edge angle θ of 32 ° and a cutting blade having a cutting edge portion coated with fluororesin is used, and an elastic body having a sponge hardness of 70 ° is used as the elastic body 48. The cutting speed v was set to 50 mm / sec.

(Evaluation)
Table 2 shows the details of Examples 1 to 25 and Comparative Examples 1 to 6, the quality of the cut surface (delamination (edge direction length ratio, depth direction length) and the number of cracks) and evaluation.

Evaluation was made into four grades of "A", "B", "C", and "x". The breakdown is as follows.
Evaluation "A": The number of cracks is 0.
Evaluation “B”: satisfies any of the following (a) to (c).
(A) The number of cracks is 1-9.
(B) The number of cracks is 10 to 15, the edge direction length ratio is less than 0.2, and the depth direction length is less than 0.1.
(C) The number of cracks is 10 to 15, the edge direction length ratio is less than 0.1, and the depth direction length is less than 0.2.
Evaluation "C": The number of cracks is 16-20.
Evaluation "x": The number of cracks is 21 or more.

  From the results shown in Table 2, among Examples 1 to 25, Examples 10, 20 and 25 were evaluated as “A” and the quality was the best. In Examples 1 to 3, 5 to 9, 11 to 19, and 21 to 24, the evaluation is “B”, but the quality is slightly inferior to that of the above-described example, but the number of cracks is 1 to 9, or cracks. The number is 10 to 15 and the edge direction length ratio is less than 0.2, the depth direction length is less than 0.1, or the number of cracks is 10 to 15 and the edge direction length The thickness ratio was less than 0.1 and the length in the depth direction was less than 0.2, which was substantially good. In Example 4, the evaluation was “C”, but it was a practically satisfactory level.

  On the other hand, Comparative Examples 1-6 were all evaluated as “x”, and it was found that the quality of the cut surface was deteriorated.

  As described above, the laminated film 10 is cut using a cutting blade (double-edged specification) having a blade edge angle θ of 32 ° or less as a cutting blade and using an elastic body having a sponge hardness of 50 ° or more as an elastic body. Alternatively, as the cutting blade, a cutting blade having a blade edge angle θ of 32 ° or less (both blade specifications) is used, and the approach speed of the cutting blade 46 to the laminated film 10 is set to 50 mm / sec or more to cut the laminated film 10. Thus, it is possible to obtain a good cut surface quality even in the laminated film 10 using the TAC film having a low elongation rate. In particular, in combination with any of the above conditions (1) to (3), the film is stable. It can be seen that good cut surface quality can be obtained.

  That is, despite the use of the first protective film 18a and the second protective film 18b having a longitudinal direction (MD) stretch rate of 22% and a lateral direction (TD) stretch rate of 18%, the quality of the cut surface is obtained. The reason for the improvement is that an elastic body having a sponge hardness of 50 ° or more is used as the elastic body 48, so that before cutting (the stage where only the elastic body 48 is in contact with the surface of the multilayer film 16) and during cutting. Since the bending deformation of the laminated film 10 is physically suppressed, it is considered that cracks are hardly generated.

  Further, by setting the cutting speed v to 50 mm / sec or more, since the cutting of the first protective film 18a is completed while the bending deformation of the first protective film 18a due to the viscosity of the adhesive 14 is small, a crack is generated. It is thought that it becomes difficult.

  In addition, the cutting method of the laminated body which concerns on this invention is not restricted to the above-mentioned embodiment, Of course, various structures can be taken, without deviating from the summary of this invention.

DESCRIPTION OF SYMBOLS 10 ... Laminated film 12 ... Separator film 14 ... Adhesive 16 ... Multilayer film 18a ... 1st protective film 18b ... 2nd protective film 20 ... Polarizer 30 ... Cutting device 36 ... Cutting jig 44 ... Base 46 ... Cutting blade 48. Elastic body

Claims (10)

In the method for cutting a laminate in which a laminate in which one or more films are laminated via an adhesive is cut by a cutting jig,
As the cutting jig, a cutting blade having a blade edge angle of 32 ° or less,
A method for cutting a laminate, wherein the approach speed of the cutting blade to the laminate is set to 50 mm / sec or more to cut the laminate. In the cutting method of the laminated body of Claim 1,
The cutting jig includes the cutting blade, a base that supports the cutting blade, and an elastic body provided on the base adjacent to the cutting blade,
An elastic body having a sponge hardness of 50 ° or more is used as the elastic body. In the method for cutting a laminate in which a laminate in which one or more films are laminated via an adhesive is cut by a cutting jig,
The cutting jig includes the cutting blade, a base that supports the cutting blade, and an elastic body provided on the base adjacent to the cutting blade,
As the cutting blade, using a cutting blade having a blade edge angle of 32 degrees or less,
An elastic body having a sponge hardness of 50 ° or more is used as the elastic body. In the cutting method of the laminated body of Claim 3,
A method for cutting a laminate, wherein the approach speed of the cutting blade to the laminate is set to 50 mm / sec or more to cut the laminate. In the cutting method of the laminated body of any one of Claims 1-4,
A cutting method for a laminate, wherein a cutting blade having a blade edge angle of 23 ° or more and 32 ° or less is used as the cutting blade. In the cutting method of the laminated body of Claim 5,
As the cutting blade, a processing blade having a mirror-finished cutting edge is used. In the cutting method of the laminated body of any one of Claims 2-6,
An elastic body having a sponge hardness of 70 ° or more is used as the elastic body. In the cutting method of the laminated body of any one of Claims 1-7,
The said laminated body has a separator film, the said adhesive, and the said 1 or more film laminated | stacked through the said adhesive on the said separator film, The cutting method of the laminated body characterized by the above-mentioned. In the cutting method of the laminated body of Claim 8,
A multilayer film composed of the one or more films is laminated on the separator film via the adhesive.
The multilayer film has a first protective film laminated on the pressure-sensitive adhesive, a polarizer laminated on the first protective film, and a second protective film laminated on the polarizer. A method for cutting a laminate, which is characterized. In the cutting method of the laminated body according to claim 9,
The first protective film and the second protective film are made of triacetyl cellulose, and have a longitudinal elongation rate of less than 42% and a lateral elongation rate of less than 43%. Method.

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