KR20100129203A - Cutting method of the laminate - Google Patents

Abstract

Even if a part (film) of the laminated body 10 is a film with a low elongation rate, the laminated body 10 is cut to the cutting edge 46 as a cutting method of the laminated body which can obtain favorable quality of a cut surface, without cost and trouble. By cutting. The laminated body 10 has the separator film 12 and the multilayer film 16 laminated | stacked on the separator film 12 via the adhesive 14. The multilayer film 16 is laminated on the first protective film 18a laminated on the adhesive 14, the polarizer 20 laminated on the first protective film 18a, and the polarizer 20. It has the 2nd protective film 18b. And the laminated body 10 is adjusted by adjusting the entry speed | rate (cutting speed v) of the cutting blade 46 with respect to the laminated body 10 to 8 mm / sec or more, Preferably it is 10 mm / sec or more. Cut.

Description

Cutting method of the laminate {METHOD OF CUTTING LAMINATED BODY}

This invention relates to the cutting method of the laminated body which cut | disconnects the laminated body which one or more films laminated | stacked through the adhesive with the cutting jig | tool.

In recent years, the method of Unexamined-Japanese-Patent No. 2006-142445 and Unexamined-Japanese-Patent No. 2003-302524 is known as a method of cut | disconnecting the laminated body laminated | stacked through the adhesive at least 1 using a cutting blade.

The cutting method described in Japanese Laid-Open Patent Publication No. 2006-142445 is performed by reducing the compressive stress applied to the laminate when the cutting blade cuts the laminate, and the reduction of the compressive stress is applied to the surface side of the laminate. A stress is applied and it is made to carry out in the state which applied the compressive stress to the back surface side. Thereby, the internal stress toward the cutting blade from the cutting surface is alleviated during the cutting process, so that the adhesion between the cutting surface and the cutting blade can be reduced, and as a result, the so-called adhesive adhesion to the adhesive can be prevented from being attached to the cutting blade.

In the cutting method described in Japanese Unexamined Patent Publication No. 2003-302524, since the polarizing plate using a hydrophilic material is particularly susceptible to moisture, among the optical members, cracks do not occur in the cut surface by controlling the moisture content of the optical member within a certain range. It is to be understood that the film is not curled after the cutting, and the cut is performed after the preparation is performed so that the moisture content of the optical component becomes 2 to 4% by mass.

In the cutting method described in JP 2006-142445 A, the cutting method has a surface shape that reduces the compressive stress applied to the laminate when the laminate is cut by a cutting blade, or a tensile stress is applied to the surface side of the laminate. And a cutting device having a pedestal having a surface shape for generating a compressive stress on the back surface side and a fixing device for fixing the laminate in close contact with the pedestal. There is a problem of overwork. In addition, since pressure is applied to the surface of the laminate in the plane direction, there is a possibility that problems such as wrinkles or deformation occur.

In the cutting method described in Japanese Unexamined Patent Publication No. 2003-302524, the moisture content of the optical component is prepared at 2 to 4 mass%, but the moisture content must be 2 to 4 mass% at the time of cutting. There is a problem of cost and labor for process control.

In addition, in JP 2006-142445 A and JP 2003-302524 A, the incidence of delamination (delamination) and cracks when the laminate is cut is large depending on the elongation of the constituent material of the laminate. There is no verification of change.

This invention is made | formed in view of such a subject, and it aims at providing the cutting method of the laminated body which can obtain the favorable quality of cut | disconnected surface, without incurring cost and effort, even if a part (film) of a laminated body is a film with low elongation rate. It is done.

[1] The method for cutting a laminate according to a first aspect of the invention is a method for cutting a laminate in which one or more films are laminated by a jig for cutting, wherein the laminate is laminated with an adhesive. It has at least a cutting blade, It is characterized by cutting the said laminated body by adjusting the entry speed of the said cutting blade with respect to the said laminated body to 8 mm / sec or more in actual measurement.

[2] In the first aspect of the present invention, the laminate is cut by adjusting an entry speed of the cutting blade to the laminate to 10 mm / sec or more in actual measurement.

[3] In the present invention, a cutting blade having a blade tip angle of 43 ° or less is used as the cutting blade.

[4] In the first aspect of the present invention, a cutting blade having a cutting edge angle of 30 ° or less is used as the cutting blade.

[5] In the first aspect of the present invention, a cutting blade having a blade end finished with a mirror surface is used as the cutting blade.

[6] In the first aspect of the present invention, when the cutting load generated at the same time is 80,000 N or more, a cutting blade having a hardness of 80 ° (Hs) and a blade body of 70 ° (Hs) or more is used as the cutting blade. Characterized in that.

[7] 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 formed adjacent to the cutting blade on the base, wherein the elastic body As an sponge, an elastic body having a sponge hardness of 30 ° or more is used.

[8] In the first aspect of the present invention, an elastic body having a sponge hardness of 50 ° or more is used as the elastic body.

[9] In the first aspect of the present invention, the laminate includes the separator film, the pressure sensitive adhesive, and the at least one film laminated on the separator film via the pressure sensitive adhesive.

[10] In the first aspect of the present invention, a multilayer film made of one or more films is laminated on the separator film via the pressure sensitive adhesive, and the multilayer film includes a first protective film laminated on the pressure sensitive adhesive, It has a polarizer laminated on 1 protective film, and the 2nd protective film laminated | stacked on this polarizer. It is characterized by the above-mentioned.

[11] In the first aspect of the present invention, the first protective film and the second protective film are made of triacetyl cellulose, and the elongation in the longitudinal direction is less than 42%, and the elongation in the lateral direction is less than 43%. .

[12] A second method for cutting a laminate according to the present invention is a method for cutting a laminate in which one or more films are laminated by a jig for cutting, wherein the laminate is laminated with an adhesive. It has a multilayer film which consists of a separator film, the said adhesive, and the said 1 or more film laminated | stacked on the said separator film via the said adhesive, The said laminated body is cut | disconnected toward the said multilayer film from the said separator film side, It is characterized by the above-mentioned. .

[13] In the second aspect of the present invention, the multilayer film includes 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. It is characterized by.

[14] The second aspect of the present invention, wherein the first protective film and the second protective film are made of triacetyl cellulose, and the elongation in the longitudinal direction is less than 42%, and the elongation in the lateral direction is less than 43%. .

As explained above, according to the cutting method of the laminated body which concerns on this invention, even if a part (film) of a laminated body is a film with a low elongation rate, favorable quality of a cut surface can be obtained without cost and trouble.

The above objects, features and advantages will become more apparent from the description of the examples of the following preferred embodiments which cooperate with the accompanying drawings.

FIG. 1: is sectional drawing which partially omits the laminated | multilayer film which concerns on this embodiment.
FIG. 2: is a block diagram which shows the 1st cutting device used by the cutting method which concerns on this embodiment. FIG.
3 is an explanatory diagram showing a jig for cutting.
4 is a configuration diagram showing a second cutting device used in the cutting method according to the present embodiment.
Fig. 5 is a plan view showing the second cutting device as seen from the top.
6 is a perspective view showing a part of an example of a drive mechanism in a press section of the second cutting device, with a part omitted.
FIG. 7: is explanatory drawing which shows the method (it also serves as description of a 1st cutting method) of cutting a laminated film.
(A)-(d) is explanatory drawing which shows the progress of the cutting edge with respect to laminated | multilayer film, and FIG.8 (c) is the cutting | disconnection situation of the laminated | multilayer film (sample 1) using the TAC film with high elongation rate. (D) of FIG. 8 shows the cutting | disconnection situation of the laminated | multilayer film (sample 2) using the TAC film with low elongation rate.
9 is an explanatory diagram showing a second cutting method.

EMBODIMENT OF THE INVENTION Hereinafter, the example of embodiment which applied the cutting method of the laminated body which concerns on this invention to the cutting method of the laminated | multilayer film for manufacturing the polarizing plate used for a liquid crystal display device etc. is demonstrated, referring FIGS.

First, the laminated | multilayer film 10 which concerns on this embodiment has the separator film 12 and the multilayer film 16 laminated | stacked on the separator film 12 through the adhesive 14 as shown in FIG. .

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

The multilayer film 16 constitutes a polarizing plate main body, the first protective film 18a laminated on the adhesive 14, the polarizer 20 laminated on the first protective film 18a, and the polarizer It has the 2nd protective film 18b laminated | stacked on the 20. As the 1st protective film 18a and the 2nd protective film 18b, the TAC film comprised from the cellulose acylate film and the cellulose triacetate (TAC) which has an average degree of acetization of 57.5%-62.5% can be used, respectively. have. In addition, the polarizer 20 can use a polyvinyl alcohol film.

And the cutting method which concerns on this embodiment is the 1st cutting device 30A as shown in FIG. 2, and the 2nd cutting device 30B corresponding to a long laminated film (FIG. 4, for example). And the like) to cut the laminated film. Thereby, many polarizing plates used for a liquid crystal display device etc. are obtained, for example.

As shown in FIG. 2, the first cutting device 30A includes a transfer table 32 on which the laminated film 10 is mounted and fixed, a transfer mechanism 34 for conveying the transfer table 32 in one direction; And a cutting jig 36 for cutting the laminated film 10 mounted and fixed on the transfer table 32, and a moving mechanism 38 for moving the cutting jig 36 in the vertical direction. Moreover, on the transfer table 32, the plastic plate 40 (for example, PET) is fixed as a base, and the laminated | multilayer film 10 is mounted and fixed on this plastic plate 40. FIG.

The moving mechanism 38 has a press panel 42 and moves the press panel 42 in a direction to approach and separate the laminated film 10 mounted and fixed on the transfer table 32. The cutting jig 36 is fixed to the lower surface of the press board 42.

As shown in FIG. 3, the cutting jig 36 has the base 44 (for example, wooden) fixed to the lower surface of the press board 42, and the blade edge | points downward by the base 44. As shown in FIG. It has a cutting blade 46 which is supported and fixed. Moreover, the elastic body 48 is provided in the lower surface of the base 44 adjacent to the cutting blade 46. In this case, the protruding amount ta (length protruding from the base 44) from the base 44 of the cutting blade 46 is set smaller than the height tb of the elastic body 48. Therefore, when cutting the laminated | multilayer film 10, the moving mechanism 38 presses the cutting jig 36 toward the laminated | multilayer film 10, and the elastic body clamped between the base 44 and the laminated | multilayer film 10 ( 48 is elastically deformed in the compression direction, whereby only the cutting edge 46 enters the laminated film 10 to cut the laminated film 10. Thereafter, when the cutting jig 36 is moved in the direction to be separated from the laminated film 10, the elastic body 48 is elastically returned, and the cutting blade 46 is quickly detached from the cutting point. 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, or the adhesive 14 in the laminated film 10 is cut by the cutting blade 46 It is not attached to the tip of the blade. Thereby, a continuous cutting operation can be performed.

The shape (shape made along the blade edge | tip) of the cutting blade 46 mentioned above may be linear form, or frame shape may be sufficient as it. In the case of a frame shape, it is a cutting operation by punching.

As shown in FIG. 4 and FIG. 5, the 2nd cutting device 30B presses the sending part 50 which supplies the long laminated film 10, and the laminated film 10 to punch out, and to obtain many polarizing plates. Drive control of the part 52, the winding part 53 which collect | recovers the laminated film 10 (residue) after punching, the conveyance mechanism 54 which conveys the laminated film 10 with fixed tension, and each part It has a control unit not shown.

The conveyance mechanism 54 functions as a base of the 1st conveyance part 56a which makes the laminated | multilayer film 10 convey to the press part 52 side, and the laminated | multilayer film 10, and works the laminated film 10 together. It has the 2nd conveyance part 56b which circulates and conveys the film 58 (it shows with a dashed-dotted line) for conveying in the direction. As the film 58, for example, a film made of PET is used.

The 1st conveyance part 56a is provided in the upstream of the press part 52, and is also sandwiched between the laminated | multilayer film 10, and the 1st pinch roll 60a which sends out to the press part 52 side, and a sending part The dancer roll 62 provided between the 50 and the 1st pinch roll 60a, and the guide roll 64 are provided. The 2nd conveyance part 56b is provided in the downstream of the press part 52, and also the 2nd pinch roll 60b which circulates the film 58 to the upstream of the press part 52, and the some guide roll. Has (64).

The press part 52 is provided in the press board 42 and the casing body 72 located above the casing body 72 by four support shafts 70a-70d (refer FIG. 5), for example. Drive mechanism 74 (refer FIG. 6) which drives the press board 42 to move up and down, and the cutting jig provided in the lower surface (surface facing the laminated film 10 to be conveyed) of the press board 42 ( 36).

As shown in FIG. 6, the drive mechanism 74 includes, among the four support shafts 70a to 70d, a first drive part 74a for moving the two support shafts 70a and 70b on the front side in the vertical direction, for example. ) And a second drive portion 74b for moving the remaining two support shafts 70c and 70d in the vertical direction.

The 1st drive part 74a is the 1st connection part 76a which connects two support shafts 70a and 70b, the 1st long hole 77a formed in the 1st connection part 76a, and the 1st eccentric cam 78a ), The first flywheel 82a having the rotational center of the first shaft 80a of the first eccentric cam 78a, the first motor 84a, and the rotational force of the first motor 84a. It has a first timing belt 86a that transmits to the first flywheel 82a. In the eccentric position of the 1st eccentric cam 78a on the opposite surface to the 1st shaft 80a, the axis | shaft through which it is inserted so that it can rotate freely in the 1st long hole 77a is formed.

The 2nd drive part 74b also has the same structure as the above-mentioned 1st drive part 74a, and is formed in the 2nd connection part 76b which connects two support shafts 70c and 70d, and the 2nd connection part 76b. The center of rotation of the 2nd long hole 77b, the 2nd eccentric cam 78b mounted so that it may rotate freely in the 2nd connection part 76b, and the 2nd shaft 80b of the 2nd eccentric cam 78b 2nd flywheel 82b, 2nd motor 84b, and 2nd timing belt 86b which transmits the rotational force of the 2nd motor 84b to the 2nd flywheel 82b.

Here, the 1st motor 84a of the 1st drive part 74a and the 2nd motor 84b of the 2nd drive part 74b are made to drive synchronously based on the timing signal from a control part. Accordingly, the first eccentric cam 78a and the second eccentric cam 78b are driven by synchronous driving of the first motor 84a and the second motor 84b of the first driver 74a and the second driver 74b. Rotating around the first shaft 80a and the second shaft 80b, respectively, the first connecting portion 76a and the second connecting portion 76b and the four support shafts 70a to 70d in the up and down direction at substantially the same timing. Will move. As a result, the press board 42 moves in the direction to approach and separate with respect to the laminated | multilayer film 10. FIG.

The cutting jig 36 is substantially the same as the configuration shown in Fig. 3, but the four jig-shaped polarizing plates (refer to Fig. 5) having rounded corners (R plane) are obtained by one cutting (punching). The cutting blade 46 is formed in a frame shape.

By the way, when a TAC film is used as the 1st protective film 18a and the 2nd protective film 18b which comprise the laminated | multilayer film 10, it can consider using a TAC film with a high elongation rate or a TAC film with a low elongation rate. have.

The elongation rate here is applied by pulling until a TAC film having a width of 20 mm × 100 mm in length is broken, and the ratio (percentage) to the original length of the increase in the length of the TAC film at the time of breaking, ie, {extended Value obtained by increased length (increment) / original length} × 100 (%).

A TAC film having a high elongation rate is a TAC film having an elongation rate of 42% or more in the longitudinal direction (MD: Machine Direction) and 43% or more in an elongation rate in the transverse direction (TD: Transverse Direction), and a TAC film having a low elongation rate in the longitudinal direction. It is TAC film whose elongation rate is less than 42%, and the elongation rate of the lateral direction is less than 43%.

And when the laminated | multilayer film 10 using the TAC film with high elongation rate was cut | disconnected, and the laminated film 10 using the TAC film with low elongation rate was cut | disconnected, it turned out that the quality of a cut surface differs significantly.

The quality of a cut surface can be evaluated by the delamination (interlayer peeling) which generate | occur | produced between the polarizer 20 and the lower 1st protective film 18a, and the number of cracks which generate | occur | produced in any of the multilayer film 16. FIG.

Delamination is a ratio with respect to the reference length (50 mm) of the delamination (interlayer peeling) length of the direction along the cross section (edge) of the polarizing plate obtained by cut | disconnecting the laminated | multilayer film 10 (following, edge direction length ratio) The average of the maximum value of the delamination length in the depth direction (inner direction) per reference length (50 mm) along the cross section of the polarizing plate obtained by cutting and measuring in a plurality of cross sections (hereinafter, 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. This experimental example measured the quality of the cut surface at the time of cut | disconnecting the laminated | multilayer film 10 (sample 1) using the TAC film with high elongation rate, and the laminated | multilayer film 10 (sample 2) using the TAC film with low elongation rate. . In cutting, for example, as shown in FIG. 7, the entry speed (hereinafter referred to as cutting speed v) of cutting blades 46 for samples 1 and 2 is adjusted to 6 mm / sec (actual value). As the elastic body 48 (see FIG. 3), an elastic body having a sponge hardness of 30 ° was used, and as the cutting edge 46, the cutting edge 46 had a cutting edge angle θ of 26 °, and the blade edge was mirror-finished. Used. Sponge hardness is the value measured with the ASKER C hardness tester (ASKERC), and is the same below. In addition, the upper surface of the multilayer film 16 (the upper surface of the second protective film 18b) faces the blade edge of the cutting blade 46, and the samples 1 and 2 are mounted and fixed on the transfer table 32, and the multilayer film ( It cut | disconnected toward the separator film 12 from the 16) side. Table 1 shows the experimental results.

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 elongation rate is 0 in the edge length length ratio, 0 mm in the depth direction length, and the number of cracks. Was 0. On the contrary, as for the quality of the cut surface of the laminated | multilayer film 10 (sample 2) using the TAC film with low elongation rate, the edge direction length ratio was 0.25, the depth direction length was 0.18 mm, and the number of cracks was 66.

Thus, it is considered that the quality of the cut surface of the laminated | multilayer film 10 (sample 2) using the TAC film with low elongation rate worsens by the mechanism as shown to Fig.8 (a)-(d).

That is, first, as shown to Fig.8 (a), the blade edge | tip of the cutting blade 46 contacts the upper surface (upper surface of the 2nd protective film 18b) of the multilayer film 16, and also the cutting blade 46 When press-fitted downward, a cutting load is applied from the edge of the upper surface of the multilayer film 16, and the laminated | multilayer film 10 is compressively deformed in the thickness direction (bending deformation of a "reverse V").

Subsequently, as shown in FIG. 8B, when the cutting blade 46 moves further downward, the cutting edge penetrates into the multilayer film 16 to cut the second protective film 18b of the upper layer, and further, a polarizer. Enter (20). Under the present circumstances, the lower 1st protective film 18a receives a compressive deformation by the blade edge | tip, and the whole laminated | multilayer film 10 is deform | transformed into a square. In particular, when cutting of the 2nd protective film 18b of an upper layer is completed, a blade edge will add force and enter.

Then, in the laminated | multilayer film 10 (sample 1) which used the TAC film with high elongation rate, as shown in FIG.8 (c), a blade edge | ramp enters with rapid force to the 1st protective film 18a of a lower layer. At this time, the lower layer of the first protective film 18a breaks along the blade edge faster than cutting by the blade edge.

On the other hand, in the laminated film 10 (sample 2) using the TAC film with low elongation rate, although a blade edge enters into the lower 1st protective film 18a at a rapid moment as shown in FIG.8 (d), Since the load reaction (breaking load) at the time of completion of breaking of the second protective film 18b is larger than that of the laminated film 10 (sample 1) using a TAC film having a high elongation rate, the first protective film of the lower layer is faster than the cutting by the cutting edge. (18a) It is broken at an angle as if it is falling apart. This causes a crack. That is, in the laminated | multilayer film 10 (sample 2) using the TAC film with low elongation rate, when it fractures in a bending deformation state, it is thought that a crack is easy to generate | occur | produce because of its hard and soft physical property. Delamination is considered to be caused by the occurrence of a gap due to the slight sliding of the interlayer adhesion site due to cracks.

Therefore, also in the laminated | multilayer film 10 (sample 2) using such a TAC film with such a low elongation rate, if quality of the cut surface of the same grade as the laminated | multilayer film 10 (sample 1) using a TAC film with high elongation rate is obtained, The width of the selectivity of a TAC film can be expanded, and the polarizing plate which has the most preferable characteristic according to the kind of liquid crystal display device, for example can be provided.

The cutting method (1st cutting method) which concerns on the 1st Embodiment shown below, and the cutting method (2nd cutting method) which concerns on 2nd Embodiment are laminated | multilayer film 10 (sample 2) using the TAC film with low elongation rate. It is a cutting method which can obtain favorable quality of a cut surface, without incurring cost and trouble.

First, a 1st cutting method cut | disconnects the laminated | multilayer film 10 toward the separator film 12 from the multilayer film 16 side, for example, as shown in FIG. 7, and cuts the cutting speed v 8 mm / sec. (A measured value) or more, Preferably it adjusts to 10 mm / sec or more (measured value) or more, and cut | disconnects the laminated film 10.

More preferably, any one or more of the following conditions (1)-(5) are satisfied.

(1) As the cutting edge 46, the cutting edge (double-blade specification) whose blade tip angle (theta) (refer FIG. 7) is 43 degrees or less is used.

(2) As the cutting blade 46, a cutting blade having a cutting edge angle θ of 30 ° or less is used.

(3) In (2), the processing blade which edged the edge part further was used.

(4) As the elastic body 48 (see FIG. 3), an elastic body having a sponge hardness of 30 ° or more is used.

(5) As the elastic body 48, an elastic body having a sponge hardness of 50 ° or more is used.

Moreover, as for the hardness Hs of the cutting blade 46, it is preferable that a body part is 40 or more and a blade tip is 50 or more.

As shown in FIG. 9, the second cutting method is different from the first cutting method so that the separator film 12 faces the blade edge of the cutting blade 46 so that the laminated film 10 is transferred onto the transfer table 32. It mounts and fixes to the multilayer film 16 from the separator film 12 side.

[Example]

EMBODIMENT OF THE INVENTION Below, the Example of this invention is given and this invention is demonstrated more concretely. In addition, the material, the usage-amount, a ratio, a process content, a processing sequence, etc. which are shown in the following examples can be suitably changed, unless it deviates from the meaning of this invention. Therefore, the scope of the present invention should not be limitedly interpreted by the specific example shown below.

[First Embodiment]

In accordance with the first cutting method (see FIG. 7), the laminated film 10 is transferred to the transfer table with the upper surface of the multilayer film 16 (the upper surface of the second protective film 18b) facing the blade edge of the cutting blade 46. It mounted and fixed on (32) and cut | disconnected toward the separator film 12 from the multilayer film 16 side.

(Laminated Film (10))

The structure of the various films which comprise the laminated | multilayer film 10 is as follows.

 Separator film 12: PET film having a thickness of 40 µm

 Adhesive 14: Thickness 30 μm

 1st protective film 18a: 40-micrometer-thick TAC film (Fuji Film company make brand name: Fujitaek)

 Polarizer 20: PVA film with a thickness of 28 μm

 2nd protective film 18b: 40-micrometer-thick TAC film (Fuji Film company make brand name: Fujitaek)

As for the elongation rate of the 1st protective film 18a and the 2nd protective film 18b, the elongation rate of longitudinal direction MD is 22%, and the elongation rate of transverse direction TD is 18%.

(Examples 1-17, Comparative Examples 1-20)

It shows in the content which mentions the detail of Examples 1-17, the comparative examples 1-20 later, and Table 2 and Table 3. In addition, in Table 2 and Table 3, data other than Examples 1-17 and Comparative Examples 1-20 was described as a reference example. All cutting speeds v are actual values, and sponge hardness was the value measured with the ASKER C hardness tester (ASKER C).

(Examples 1-3: Table 2)

Example 1 adjusts the cutting speed v to 8 mm / sec, uses the elastic body with a sponge hardness of 50 degrees as the elastic body 48, and the cutting edge 46 has the cutting edge angle θ as 26 degrees. In addition, the processing edge | tip with which the blade edge part was mirror-finished was used.

Example 2 was made the same as Example 1 except having adjusted the cutting speed v to 9 mm / sec.

Example 3 was similar to Example 1 except having adjusted the cutting speed v to 10 mm / sec.

(Comparative Examples 1 and 2: Table 2)

In Comparative Example 1, the cutting speed v was adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 30 ° was used as the elastic body 48, and the cutting edge 46 had a cutting edge angle θ of 26 °. In addition, the processing edge | tip with which the blade edge part was mirror-finished was used.

Comparative Example 2 was similar to Comparative Example 1 except that the cutting speed v was adjusted to 7 mm / sec.

(Examples 4-6: Table 2)

Example 4 adjusts the cutting speed v to 8 mm / sec, uses the elastic body whose sponge hardness is 30 degrees as the elastic body 48, and the cutting edge 46 is 26 degrees as the cutting edge 46, In addition, the processing edge | tip with which the blade edge part was mirror-finished was used.

Example 5 was similar to Example 4 except having adjusted the cutting speed v to 9 mm / sec.

Example 6 was similar to Example 4 except having adjusted the cutting speed v to 10 mm / sec.

(Comparative Examples 3 and 4: Table 2)

In Comparative Example 3, the cutting speed v was adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 25 ° was used as the elastic body 48, and the cutting edge 46 had a cutting edge angle θ of 26 °. In addition, the processing edge | tip with which the blade edge part was mirror-finished was used.

Comparative Example 4 was similar to Comparative Example 3 except that the cutting speed v was adjusted to 7 mm / sec.

(Example 7: Table 2)

Example 7 adjusts the cutting speed v to 10 mm / sec, uses an elastic body having a sponge hardness of 25 ° as the elastic body 48, and has a cutting edge 46 as the cutting edge angle 26. In addition, the processing edge | tip with which the blade edge part was mirror-finished was used.

(Comparative Examples 5 and 6: Table 2)

In Comparative Example 5, the cutting speed v was adjusted to 6 mm / sec, an elastic body having a sponge hardness of 50 ° was used as the elastic body 48, and the cutting edge 46 had a blade tip angle θ of 43 °. Standard blades (non-mirrored blades) were used.

Comparative Example 6 was similar to Comparative Example 5 except that the cutting speed v was adjusted to 7 mm / sec.

(Examples 8-10: Table 2)

Example 8 adjusts the cutting speed v to 8 mm / sec, uses the elastic body whose sponge hardness is 50 degrees as the elastic body 48, and has the blade tip angle (theta) as 43 degrees as the cutting blade 46. Standard blades were used.

Example 9 was similar to Example 8 except having adjusted the cutting speed v to 9 mm / sec.

Example 10 was similar to Example 8 except having adjusted the cutting speed v to 10 mm / sec.

(Comparative Example 7, 8: Table 2)

In Comparative Example 7, the cutting speed v was adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 30 ° was used as the elastic body 48, and the cutting edge 46 had a blade tip angle θ of 43 °. Standard blades were used.

Comparative Example 8 was similar to Comparative Example 7 except that the cutting speed v was adjusted to 7 mm / sec.

(Examples 11 and 12: Table 2)

Example 11 adjusts the cutting speed v to 9 mm / sec, uses the elastic body whose sponge hardness is 30 degrees as the elastic body 48, and has the blade tip angle (theta) as 43 degrees as the cutting blade 46. Standard blades were used.

Example 12 was similar to Example 11 except having adjusted the cutting speed v to 10 mm / sec.

(Comparative Examples 9 and 10: Table 2)

In Comparative Example 9, the cutting speed v was adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 25 ° was used as the elastic body 48, and the cutting edge 46 had a blade tip angle θ of 43 °. Standard blades were used.

Comparative Example 10 was similar to Comparative Example 9 except that the cutting speed v was adjusted to 7 mm / sec.

(Comparative Examples 11 and 12: Table 3)

In Comparative Example 11, the cutting speed v was adjusted to 6 mm / sec, an elastic body having a sponge hardness of 50 ° was used as the elastic body 48, and the cutting edge 46 had a blade tip angle θ of 43 °. In addition, the processing edge | tip with which the blade edge part was mirror-finished was used.

Comparative Example 12 was similar to Comparative Example 11 except that the cutting speed v was adjusted to 7 mm / sec.

(Comparative Examples 13 and 14: Table 3)

Comparative Example 13 adjusts the cutting speed v to 6 mm / sec, uses an elastic body having a sponge hardness of 50 ° as the elastic body 48, and uses a standard blade having a blade edge angle of 45 ° as the cutting edge 46. Used.

Comparative Example 14 was similar to Comparative Example 1 3 except that the cutting speed v was adjusted to 7 mm / sec.

(Examples 13-15: Table 3)

Example 13 adjusts the cutting speed v to 8 mm / sec, uses the elastic body whose sponge hardness is 50 degrees as the elastic body 48, and has the cutting edge angle 45 as the cutting edge 46 as 45 degrees. Standard blades were used.

Example 14 was similar to Example 1-3 except having adjusted the cutting speed v to 9 mm / sec.

Example 15 was similar to Example 13 except having adjusted the cutting speed v to 10 mm / sec.

(Comparative Examples 15, 16: Table 3)

In Comparative Example 15, the cutting speed v was adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 30 ° was used as the elastic body 48, and the cutting edge 46 had a cutting edge angle θ of 45 °. Standard blades were used.

Comparative Example 16 was similar to Comparative Example 15 except that the cutting speed v was adjusted to 7 mm / sec.

(Example 16: Table 3)

Example 16 adjusts the cutting speed v to 10 mm / sec, uses the elastic body whose sponge hardness is 30 degrees as the elastic body 48, and has the cutting edge angle 45 as the cutting edge 46 as 45 degrees. Standard blades were used.

(Comparative Examples 17 and 18: Table 3)

In Comparative Example 17, the cutting speed v was adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 50 ° was used as the elastic body 48, and as the cutting edge 46, the blade tip angle θ was 45 °. In addition, the processing edge | tip with which the blade edge part was mirror-finished was used.

Comparative Example 18 was similar to Comparative Example 1 7 except that the cutting speed v was adjusted to 7 mm / sec.

(Comparative Examples 19, 20: Table 3)

In Comparative Example 19, the cutting speed v was adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 25 ° was used as the elastic body 48, and the cutting edge 46 had a blade tip angle θ of 45 °. Standard blades were used.

Comparative Example 20 was similar to Comparative Example 1 9 except that the cutting speed v was adjusted to 7 mm / sec.

(Example 17: Table 3)

Example 17 adjusts the cutting speed v to 10 mm / sec, uses the elastic body whose sponge hardness is 25 degrees as the elastic body 48, and uses the cutting edge 46 as the cutting edge 46 which is 45 degrees. Standard blades were used.

(evaluation)

Tables 2 and 3 show the details of Examples 1 to 17 and Comparative Examples 1 to 20, the quality of the cut surface (the delamination (edge length ratio, depth direction length) and the number of cracks) and the evaluation.

Evaluation was made into six steps of "A", "B", "C", "D", "E", and "x". The details are as follows.

Evaluation "A": The edge direction length ratio is 0.35 or less, the depth direction length is 0.25 mm or less, and the number of cracks is 20 or less.

Evaluation "B": The edge direction length ratio is 0.35 or less, the depth direction length is 0.25 mm or less, and the number of cracks is 21-30.

Evaluation "C": The edge direction length ratio is 0.35 or less, the depth direction length is 0.25 mm or less, and the number of cracks is 31-40.

Evaluation "D": Edge direction length ratio is 0.35 or less, depth direction length is 0.25 mm or less, and the number of cracks is 41-50.

Evaluation "E": Edge direction length ratio is 0.35 or less, depth direction length is 0.25 mm or less, and the number of cracks is 51-60.

Evaluation "x": When the edge direction length ratio exceeds 0.35, or the depth direction length exceeds 0.25 mm, or the number of cracks is 61 or more.

From the results of Table 2 and Table 3, in Examples 1-17, all of Examples 1-3, 6, 8-10, 12, and 13-15 were "A", and the quality was the best. As for Example 7, 16, and 17, evaluation was "B" and the quality was slightly inferior to the Example mentioned above, but the crack was 30 or less, and was substantially favorable. In Example 4, 5 and 11, evaluation was "C", but it was the level which was satisfactory practically.

On the other hand, as for Comparative Examples 1-20, evaluation was "x" or "E", and it turned out that the quality of a cut surface is falling.

In this way, by cutting the laminated film 10 by adjusting the cutting speed to 8 mm / sec or more, preferably 10 mm / sec or more, even when the laminated film 10 using a TAC film having a low elongation is good, It can be seen that, in particular, by combining with any of the conditions (1) to (5) described above, it can be seen that a satisfactory cut surface quality can be obtained stably.

That is, although the 1st protective film 18a and the 2nd protective film 18b whose elongation rate of longitudinal direction MD is 22% and the elongation rate of transverse direction TD are 18% were used, the quality of a cut surface improved. The reason is that, by adjusting the cutting speed v to 8 mm / sec or more, preferably 10 mm / sec or more, the first deflection deformation of the first protective film 18a due to the viscosity of the pressure-sensitive adhesive 14 is small. Since cutting of the protective film 18a is completed, it is thought that a crack does not arise easily.

In addition, by using an elastic body having a sponge hardness of 30 ° or more, preferably 50 ° or more as the elastic body 48, the laminated film before cutting (the step in which only the elastic body 48 is in contact with the surface of the multilayer film 16) and during cutting Since the bending deformation of (10) is physically suppressed, it is thought that a crack hardly arises.

Second Embodiment

According to the 2nd cutting method (refer FIG. 9), the separator film 12 is opposed to the cutting edge of the cutting blade 46, and the laminated | multilayer film 10 is mounted and fixed on the transfer table 32, and a separator film ( It cut out toward the multilayer film 16 from the 12) side, and obtained Example 18.

The structure of the laminated | multilayer film 10 which concerns on this Example 18 is the same as that of 1st Example mentioned above. In addition, as shown in Table 4 below, the cutting speed v is adjusted to 6 mm / sec, and an elastic body having a sponge hardness of 30 ° is used as the elastic body 48, and the blade tip angle is 26 ° as the cutting edge 46. In addition, the processing edge of which the blade edge part was mirror-finished was used. As a result of confirming the quality of the cut surface after cutting, the edge direction length ratio was 0, the depth direction length was 0 mm, and the number of cracks was 0.

Although the cutting speed v is slow at 6 mm / sec, the quality of the cut surface is good. In this second embodiment, the cutting edge 46 is the separator film 12 → the pressure-sensitive adhesive 14 → the first protection. Since the first protective film 18a that enters like the film 18a and is harder than the pressure sensitive adhesive 14 is present in the lower layer, the bending deformation of the first protective film 18a resulting from the viscosity of the pressure sensitive adhesive 14 is It hardly occurs, and it is thought that crack generation was suppressed by this.

[Third Embodiment]

Next, the reference example and Example 19 were confirmed in order to find out the preferable conditions when the size of a cutting jig is about 1 m or more per one edge | side, and this cutting load is 80,000 N or more and the extended length which cuts simultaneously is long. The details and determination results of this Reference Example and Example 19 are shown in Table 5 below.

The reference example was cut | disconnected on the same conditions as Example 1 mentioned above. In this reference example, both delamination and cracks deteriorated. This is because the blade is not manufactured at the same height in the longitudinal direction on the basis of its manufacturing precision. Therefore, when the length of cutting at the same time becomes longer, the load is concentrated at the point where the height of the blade is partially high at the instant of cutting, and it is considered that the blade bends or shakes momentarily as a cause of deterioration.

On the other hand, in Example 19, the hardness of the blade was made high, the hardness of the blade edge was 80 ° (Hs) and the body hardness was 72 °. The favorable result that this 0, depth direction length was 0 mm, and the number of cracks 0 was obtained. Since the hardness of the blade is improved, it is hard to bend or shake even when a strong force is applied to the blade. As a result, it is considered that the occurrence of delamination and cracking is suppressed.

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

Claims (14)

In the cutting method of the laminated body which cut | disconnects the laminated body 10 laminated | stacked through the adhesive 14 at least one film by the cutting jig 36,
The cutting jig 36 has at least a cutting blade 46,
A method of cutting a laminate, characterized in that the laminate (10) is cut by adjusting the entry speed (v) of the cutting blade (46) to the laminate (10) to 8 mm / sec or more in actual measurement. The method of claim 1,
The laminated body (10) is cut | disconnected by adjusting the entry speed of the said cutting blade (46) with respect to the said laminated body (10) to 10 mm / sec or more in actual measurement. The method of claim 1,
The cutting method of the laminated body characterized by using a cutting blade whose blade tip angle (theta) is 43 degrees or less as said cutting blade (46). The method of claim 3, wherein
The cutting method of the laminated body characterized by using a cutting blade whose blade tip angle (theta) is 30 degrees or less as said cutting blade (46). The method of claim 4, wherein
The cutting method of the laminated body characterized by the above-mentioned cutting edge (46) using the processing edge of which the blade edge part was mirror-finished. The method of claim 5, wherein
In the case where the cutting load generated at the same time exceeds 80,000 N, a cutting blade having a cutting edge hardness of 80 ° (Hs) and a cutting edge body of 70 ° (Hs) or more is used as the cutting blade. Cutting method. The method of claim 1,
The cutting jig 36 includes the cutting blade 46, a base 44 supporting the cutting blade 46, and an elastic body formed adjacent to the cutting blade 46 on the base 44. Has 48,
An elastic body having a sponge hardness of 30 ° or more is used as the elastic body (48). The method of claim 7, wherein
An elastic body having a sponge hardness of 50 ° or more is used as the elastic body (48). The method of claim 1,
The said laminated body 10 has the separator film 12, the said adhesive 14, and the said 1 or more film laminated | stacked on the said separator film 12 via the said adhesive 14, It is characterized by the above-mentioned. The cutting method of the laminated body. The method of claim 9,
The multilayer film 16 which consists of the said 1 or more film is laminated | stacked on the said separator film 12 through the said adhesive 14,
The said multilayer film 16 is on the 1st protective film 18a laminated | stacked on the said adhesive 14, the polarizer 20 laminated | stacked on the 1st protective film 18a, and this polarizer 20. It has a laminated 2nd protective film (18b), The cutting method of the laminated body characterized by the above-mentioned. The method of claim 10,
The said 1st protective film 18a and the 2nd protective film 18b are comprised from triacetyl cellulose, and the elongation rate of a longitudinal direction is less than 42%, and the elongation rate of a lateral direction is less than 43%, The cutting of the laminated body characterized by the above-mentioned. Way. In the cutting method of the laminated body which cut | disconnects the laminated body 10 laminated | stacked through the adhesive 14 at least one film by the cutting jig 36,
The laminated body 10 consists of a separator film 12, the said adhesive 14, and the multilayer film 16 which consists of the said 1 or more film laminated | stacked on the said separator film 12 via the said adhesive 14. ),
The said laminated body (10) is cut | disconnected toward the said multilayer film (16) from the said separator film (12) side, The cutting method of the laminated body characterized by the above-mentioned. The method of claim 12,
The said multilayer film 16 is on the 1st protective film 18a laminated | stacked on the said adhesive 14, the polarizer 20 laminated | stacked on the 1st protective film 18b, and the polarizer 20. It has a laminated 2nd protective film (18b), The cutting method of the laminated body characterized by the above-mentioned. The method of claim 13,
The said 1st protective film 18a and the 2nd protective film 18b are comprised from triacetyl cellulose, and the elongation rate of a longitudinal direction is less than 42%, and the elongation rate of a lateral direction is less than 43%, The cutting of the laminated body characterized by the above-mentioned. Way.

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