JP3483505B2 - Finishing method of peripheral edge of laminated film - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for finishing the peripheral edge of a laminated film.

[0002]

2. Description of the Related Art An example of a laminated film formed by laminating a plurality of films via an adhesive is an optical film such as a polarizing film. Such a laminated film is generally obtained by cutting a film laminate with a Thomson blade or the like. It is commercialized by shearing to a predetermined size with a blade.

When the film laminate is sheared, a pressure is applied to each laminated film from the outer side of both film surfaces by a cutting blade, so that the pressure sensitive adhesive tends to protrude from the peripheral edge of each laminated film. Then, they were shipped as they were without finishing the periphery of the laminated film after shearing.

[0004]

Conventionally, since the pressure-sensitive adhesive was shipped while protruding from the peripheral edge of the laminated film, there were the following problems.

1) The adhesive sticking out from the peripheral edge of the laminated film becomes a so-called "glue ball" in the form of granules, and when a plurality of laminated films are stacked and shipped, the glue balls are stuck between the laminated films. Dents (scratches) on the laminated film.

2) Some laminated films are used by laminating a plurality of laminated films such as a polarizing film and a retardation film. In this case, a glue ball is inserted between both laminated films. In this state, when the laminated film is adhered to, for example, the glass of the liquid crystal display device, only the portion of the glue ball does not have a desired color or becomes a black dot.

3) Floating dust adheres to the adhesive protruding from the peripheral edge of the laminated film, or dust adheres to the adhesive through human hands, and the laminated film becomes dirty.

4) Since the adhesive sticks out from the peripheral edge of the film, the peripheral edge looks poor even if a small amount of the adhesive sticks out.

5) In an automated line where a plurality of laminated films are taken out one by one from the upper side with a robot hand and attached to a liquid crystal display device or the like, the uppermost laminated film is used with the robot hand. When taken out, the lower laminated film to be taken out next may come to the uppermost laminated film through the above-mentioned adhesive, and in such a case, the automation line must be temporarily stopped to respond. I have to.

In other words, in 1) and 2) above, the laminated film becomes a defective product, in 3) and 4) the commercial value of the laminated film decreases, and in 5) the laminated film that has been commercialized is attached to another object. There was a problem that the work efficiency in the case of doing so decreased.

In order to solve these problems, the pressure-sensitive adhesive is modified so that the pressure-sensitive adhesive has good cutting workability, and the shape, material and cutting specifications of the cutting blade for the laminated film are optimized. Attempts have been made to improve cutting conditions, but the desired results have not been obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent defective products from being produced in a laminated film, to improve the commercial value of the laminated film, and to make the laminated film into a product. The point is to be able to improve the work efficiency when sticking to other things.

[0013]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Structure] A plurality of laminated films formed by laminating a plurality of films via an adhesive are stacked, and the laminated films are formed by a pair of resin sandwiching members from the outer sides of both outermost film surfaces. In the sandwiched state, the blade surface of the rotary blade is opposed to the peripheral surface of the aggregate of laminated films, and the peripheral surface of the aggregate of laminated films is finished and ground by the rotary blade together with the peripheral surface of the sandwiching member.

[Operation] [a] A plurality of laminated films formed by laminating a plurality of films via an adhesive are laminated. Then, the blade surface of the rotary blade is made to face the peripheral surface of the aggregate of laminated films, and in this state, the peripheral surface of the aggregate of laminated films is ground and finished by the rotary blade.

[B] Since the peripheral surface of the laminated film is faced to the peripheral surface of the aggregate of laminated films by the rotary blade, the peripheral surface of the laminated film is finished by a rotary blade. It is difficult to apply pressure from the side, and it becomes difficult for the adhesive to stick out from the peripheral edge of the laminated film.

The pressure-sensitive adhesive protruding from the peripheral edge of the laminated film can be scraped off with the rotary blade, and the pressure-sensitive adhesive portion on the side edge of the laminated film can be easily solidified by the heat accompanying the cutting of the rotary blade. As a result, the pressure-sensitive adhesive in the laminated film can be brought into a state in which the outer peripheral surface of the pressure-sensitive adhesive is retracted inward from the side edge.

[C] By the above-mentioned actions [a] and [b], it is possible to suppress the occurrence of so-called glue balls as in the conventional case. Therefore, 1) a glue ball is formed between a plurality of laminated laminated films. It is possible to avoid getting in the state of being stuck in, and it is possible to avoid making a dent (push) on the laminated film with the glue balls.

2) Similarly, when laminating the laminated films together, it is possible to avoid the situation in which the glue balls enter between the laminated films, which is a problem in the past, that is, after the laminating. When the film is attached to, for example, the glass of a liquid crystal display device, it is possible to solve the problem that only the portion of the glue ball does not have a desired color or becomes a black dot.

[D] By the above-mentioned actions [a] and [b], it is possible to prevent the adhesive from protruding from the peripheral edge of the laminated film. Therefore, 3) floating dust adheres to the peripheral edge of the laminated film. And it is less likely that dust will adhere to it through human hands,
It is possible to prevent the laminated film from becoming dirty.

4) It is possible to prevent the peripheral edge of the laminated film from becoming unattractive.

5) In an automated line in which a plurality of laminated films are taken out one by one from the upper side with a robot hand and attached to a liquid crystal display device or the like, the uppermost laminated film is used with the robot hand. When taking out, the lower laminated film to be taken out next becomes difficult to come in contact with the uppermost laminated film, and the line is temporarily stopped because the lower laminated film to be taken out next comes to the uppermost laminated film. Can be avoided.

[Effect] Therefore, the above-mentioned action [a],
By [B] and [C], it is possible to prevent defective products from appearing in the laminated film, and by the above actions [A], [B] and [D],
The commercial value of the laminated film can be improved, and the working efficiency when the commercialized laminated film is attached to another object can be improved.

The structure, operation, and effect of the invention according to claim 2 are as follows.

[Structure] A plurality of films are laminated via an adhesive, and a plurality of laminated films with the adhesive protruding from between the plurality of films are stacked, and an assembly of the laminated films. With the pair of resin sandwiching members sandwiching from the outer sides of the outermost film surfaces,
Face the blade surface of the rotary blade to the peripheral surface of the laminated film,
The peripheral surface of the aggregate of the laminated films is finished and ground together with the peripheral surface of the holding member by the rotary blade.

[Operation] In addition to the same operation as the operation according to the first aspect, the following operation can be performed.

As described above, the peripheral surface of the laminated film assembly is sandwiched by a pair of resin sandwiching members from the outer sides of both outermost film surfaces, and the peripheral surface of the laminated film assembly is sandwiched by a rotary blade. Since the peripheral surfaces of the pair of sandwiching members are ground together, it is possible to prevent fluttering of each laminated film due to the grounding.

Further, since the laminated film assembly is sandwiched by the pair of resin sandwiching members from the outer sides of the outermost film surfaces, both the films are sandwiched by the sandwiching members. It is possible to avoid scratching the surface.

By forming the sandwiching member with a resin material having a cutting resistance comparable to that of the laminated film, the laminated film assembly can be cut more smoothly.

[Effect] Therefore, it becomes easy to obtain the same effect as the effect of the structure of claim 1.

[0031]

[Structure] In the structure of the invention according to claim 1 or 2, a plurality of laminated films formed by laminating a plurality of films via an adhesive are laminated, and the peripheral surface of the aggregate of the laminated films is Polishing with an abrasive material containing fine abrasive particles is preferred.

[Operation] [E] A plurality of laminated films formed by laminating a plurality of films with an adhesive interposed therebetween are stacked. Then, the peripheral surface of the aggregate of the laminated film is polished with an abrasive material containing fine abrasive particles.

[F] Since the peripheral surface of the aggregate of laminated films is polished with an abrasive material containing fine abrasive particles, it is difficult for pressure to be applied to each laminated film from the outside of both film surfaces, and the adhesive is It does not easily stick out from the peripheral edge of the laminated film.

Then, the adhesive protruding from the peripheral edge of the laminated film can be scraped off with an abrasive.
The pressure-sensitive adhesive portion on the side edge side of the laminated film is more easily solidified by the heat associated with the polishing of the abrasive, and as a result, the outer peripheral surface of the pressure-sensitive adhesive in the laminated film is retracted inward from the side edge. Can be set to

[G] Due to the above-mentioned actions [E] and [F], the same actions as the above-mentioned actions [C] and [D] can be obtained.

[Effect] Therefore, it is possible to prevent defective products from appearing on the laminated film, improve the commercial value of the laminated film, and improve the work efficiency when the productized laminated film is attached to another object. Can be improved.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the protect film 1
A method of finishing the periphery of the polarizing film 1 will be described by taking a rectangular polarizing film 1 (corresponding to a laminated film) in which a plurality of films such as A, the polarizing film 1B, and the separate film 1C are laminated with an adhesive. .

The polarizing film 1 is formed by shearing the optical film laminate to a predetermined size with a cutting blade such as a Thomson blade. When the optical film laminate is sheared, each polarizing film 1 is cut from the cutting blade. Since a pressing force is applied to the outer surfaces of both film surfaces, the adhesive is in a state of protruding from the peripheral edge of the polarizing film 1.

[First Embodiment] As shown in FIGS. 2 and 3, a plurality of the polarizing films 1 are superposed on each other, and the polarizing film 1 is provided on both outermost film surface sides of the assembly 2 of the polarizing films. A pair of slightly small rectangular acrylic plates 3 (corresponding to a sandwiching member made of resin) are overlapped so that each polarizing film 1 slightly protrudes from the side edges of the pair of acrylic plates 3, and the polarizing films are assembled in that state. The table of the numerical control milling machine for the body 2 via the jig 6 (not shown)
Fixed to.

More specifically, the polarizing film assembly 2 in which a pair of acrylic plates 3 are superposed on both film surfaces is placed on the base 7 of the jig 6, and the polarizing film assembly 2 faces each other in plan view. One side of the two sides is clamped to the base 7 by the pair of clamp tools 5, and the other side is clamped to the base 7 by the pair of clamp tools 5.

As a result, the polarizing film assembly 2 is sandwiched between the pair of acrylic plates 3 from the outer sides of the outermost film surfaces.

Then, the base 7 is fixed by the vise 9 on the table of the numerical control milling machine.

Next, as shown in FIG. 4, one of the two peripheral surfaces on the other two sides of the polarizing film assembly 2 is provided with an end mill 8 (corresponding to a rotary blade) of a numerical control milling machine on one peripheral surface. With the blade surfaces facing each other, one of the peripheral surfaces is finish-ground by the end mill 8. When the finish cutting of one peripheral surface is finished, the other peripheral surface is finished-ground by the same method.

When both the peripheral surfaces have been finished, the clamping by the four clamping tools 5 is released, and the polarizing film assembly 2 is finished with one of the two sides.
The side is clamped to the base 7 with the pair of clamp tools 5, and the other side is clamped to the base 7 with the pair of clamp tools 5.

Then, of the two peripheral surfaces on the two sides where the finishing of the polarizing film assembly 2 has not been finished, one of the peripheral surfaces is faced to the blade surface of the end mill 8. Finish milling is performed by the end mill 8. When the finishing milling of one peripheral surface is completed, the other circumferential surface is finished milling.

As a result, the adhesive protruding from the peripheral edge of each polarizing film 1 can be scraped off.
The pressure-sensitive adhesive portion on the side edge side of the polarizing film 1 is easily solidified by the heat accompanying the cutting of the end mill 8. As a result, the outer peripheral surface of the pressure-sensitive adhesive in the polarizing film 1 is retracted inward from the side edge. Can be set to

[Another Embodiment of the First Embodiment] As shown in FIG. 5, a pair of acrylic plates of approximately the same size as the polarizing film 1 are provided on both outermost film surface sides of the polarizing film assembly 2. 3 is superposed so that the side edges of the pair of acrylic plates 3 and the side edges of each polarizing film 1 are aligned, and in that state, is fixed to the table of the numerical control milling machine by the same means as the means in the first embodiment. Then, the peripheral surface of the assembly 2 of the polarizing films may be finished and ground together with the peripheral surface of the acrylic plate 3 by the end mill 8.

According to this means, since the peripheral surface of the assembly 2 of polarizing films is finished by the end mill 8 together with the peripheral surfaces of the pair of acrylic plates 3, it is possible to prevent the fluttering of each polarizing film 1 due to the finishing.

The cutting resistance of the acrylic plate 3 is substantially the same as that of the polarizing film 1 so that the end mill 8 can smoothly finish and grind it.

Instead of the end mill 8, the polarizing film assembly 2 or the like may be cut with a front milling cutter.

Further, not only the numerically controlled milling machine but also a general manually operated milling machine may be used to cut the polarizing film assembly 2 and the like.

[Second Embodiment] As shown in FIG. 6, a plurality of polarizing films 1 sandwiched between a pair of acrylic plates 3 are superposed on each other, and the peripheral surface of a polarizing film assembly 2 is provided with fine abrasive particles. The belt-shaped polishing material 10 is used for polishing. The abrasive 10 is wound around a plurality of rolling wheels 11 (one of which is a driving wheel).

When polishing the peripheral surface of the polarizing film assembly 2, the polishing material 10 is not driven.
To stand still.

Then, the assembly 2 of the polarizing films is reciprocally moved in the longitudinal direction of the abrasive 10 by a position changing mechanism (not shown) to polish the peripheral surface of the assembly 2 of the polarizing films.

As a result, the adhesive protruding from the peripheral edge of the polarizing film 1 can be scraped off, and the adhesive portion on the side edge of the polarizing film 1 can be easily solidified by the heat accompanying the polishing of the abrasive 10. As a result, the pressure-sensitive adhesive in the polarizing film 1 can be brought into a state in which the outer peripheral surface of the pressure-sensitive adhesive is retracted inward from the side edge.

When polishing of the polarizing film assembly 2 in the same portion of the polishing material 10 continues to some extent (for example, when a predetermined number of polarizing film assemblies 2 are supported), the drive wheel is driven to rotate. The abrasive 10 is fed by a predetermined amount, and the peripheral surface of the assembly 2 of polarizing films is abraded by another abrasive.

[Another Embodiment of the Second Embodiment] The peripheral surface of the assembly 2 of polarizing films may be polished by rotating the belt-shaped abrasive 10 by driving the drive wheels.

[Other Embodiments of First and Second Embodiments] The film whose peripheral edge is finished by the method according to the present invention is not limited to the polarizing film, and may be a film other than the optical film.

Instead of the acrylic plate, the polarizing film assembly 2 may be sandwiched between PET films.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a polarizing film.

FIG. 2 is a perspective view showing a state in which an assembly of polarizing films is attached to a numerical control milling machine.

FIG. 3 is a longitudinal sectional view showing a state in which the assembly of polarizing films is attached to a numerical control milling machine.

FIG. 4 is a diagram showing a state in which an assembly of polarizing films is being cut.

FIG. 5 is a view showing another embodiment of the first embodiment.

FIG. 6 is a diagram showing a state in which an assembly of polarizing films is being polished.

[Explanation of symbols]

1A, 1B, 1C film 1 laminated film 2 Assembly of laminated films 3 clamping members 8 rotary blades 10 Abrasive

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-318218 (JP, A) JP-A-61-38860 (JP, A) JP-A-51-142175 (JP, A) 82461 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23C 3/12 B24B 19/00 B24B 21/00

Claims (2)

(57) [Claims] 1. A plurality of laminated films formed by laminating a plurality of films with an adhesive interposed therebetween, the laminated films being paired from the outer sides of both outermost film surfaces.
While sandwiched by the sandwiching member, the blade surface of the rotary blade is faced to the peripheral surface of the aggregate of laminated films , and
The peripheral surface of the aggregate of the laminated film to the circumference of the holding member.
Finishing method for the peripheral edge of laminated film, where each surface is finished. 2. A comprises by a plurality of films are laminated via an adhesive, wherein the adhesive from among a plurality of films superposed plural laminated film in a state where <br/> the heading, the Outer side of both outermost film surfaces with laminated film assembly
From the state of being sandwiched by a pair of resin sandwiching members,
Opposed blade surface of the rotary blade on the peripheral surface of the film, the rotation
The peripheral surface of the aggregate of the laminated film is clamped by the blade with the blade.
A method for finishing the peripheral edge of a laminated film in which the peripheral surface of the material is finished and ground.