TWI481507B - Method for peeling a film, manufacturing process for optical film, apparatus for peeling a film, and device for manufacturing an optical film - Google Patents

Description

Film peeling method, optical film manufacturing method, film peeling mechanism, and optical film manufacturing device

The present invention relates to a method for peeling off a substrate-free double-sided adhesive sheet, a method for producing an optical film, a film peeling mechanism, and an optical film manufacturing device. More specifically, the present invention relates to the prevention of adhesion of an adhesive when a light release film is peeled off from a substrate-free double-sided adhesive sheet having a different peeling force from a light release film and an adhesive, and a heavy release film and an adhesive layer. A film peeling method for a light release film and a method for producing an optical film using the film peeling method.

The non-substrate double-sided adhesive sheet of the light release film and the heavy release film which have different peeling force on the adhesive layer, the biggest problem thereof is that the peeling of the light release film cannot be performed stably, and the surface of the adhesive agent surface is rough or occurs. The adhesive is attached to a light release film or the like. In order to suppress the adhesion of the adhesive, the method of increasing the peeling force difference between the heavy release film and the light release film was investigated, but the adhesion of the adhesive was not completely inhibited.

Further, Patent Document 1 discloses an adhesive film peeling method in which a part of an adhesive film is peeled off by an adhesive body such as a liquid crystal display panel, and a part of the adhesive film is peeled off, and the teared portion is inserted and wound while being rotated by a predetermined rotation. The film is peeled off, and the peeling speed is fixed, and the streaks are not formed on the adhesive surface. Further, Patent Document 2 discloses that when the optical member is peeled off, the peeling sheet is attached, and then the optical member is peeled off together with the peeling sheet, without The method of peeling off the parts of the other party; however, the method of continuously peeling off the lightly peeling film from the non-substrate double-sided adhesive sheet is not sufficiently studied in terms of mechanical, and the film peeling method for achieving stable peeling is also unknown.

Patent Document 1: Japanese Patent Publication No. 8-292433

Patent Document 2: JP-A-2002-40259

The present invention has been made in view of the above problems, and provides a film peeling method capable of achieving stable peeling and inhibiting adhesion of an adhesive to a light release film when the light release film is peeled off from the substrate-free double-sided adhesive sheet.

In order to achieve the above object, it has been found that the above-described problems can be solved by contacting the substrate-less double-sided adhesive sheet with one or more transfer rollers and peeling the light release film at a specific angle. That is, the present invention provides:

A film peeling method, which comprises a film peeling method in which a light-peelable film is laminated on one side of an adhesive layer, and a substrate-free double-sided adhesive sheet which is formed by laminating a film on the other side thereof is continuously peeled off According to one or more conveying steering rollers that are in contact with the non-substrate double-sided adhesive sheet, the conveying direction of the lightly peeling film and/or the conveying direction of the substrate-free double-sided adhesive sheet after peeling are changed, The portion of the double-sided adhesive sheet that is in contact with the conveying roller is peeled off from the light release film, and the angle (θ ₁ ) of the peeling surface of the lightly peeling film to the peeling surface of the substrate-free double-sided adhesive sheet after peeling is 28 degrees or more.

2. The film peeling method according to 1, wherein the conveyance direction of the non-substrate double-sided adhesive sheet after peeling is changed to the conveyance roller in contact with the heavy release film side of the substrate-free double-sided adhesive sheet; The angle (θ ₂ ) formed by the direction of the conveyance direction of the non-substrate double-sided adhesive sheet before peeling to the peeling surface of the double-sided adhesive sheet after peeling is more than 0 degrees and 180 degrees or less.

3. The film peeling method according to the above 2, wherein the θ ₁ and θ ₂ are the same angle.

4. The film peeling method according to 1, wherein the substrate-less double-sided adhesive sheet has a transport speed of 1 to 50 m/min.

5. The film peeling method according to 1, wherein the roll diameter of the conveyance steering roller is 2 × 10 ² to 6 × 10 ⁴ times the thickness of the adhesive layer.

A method for producing an optical film comprising an adhesive layer, characterized in that the film peeling method according to the above 1 is carried out by peeling the light release film from the substrate-free double-sided adhesive sheet, and the substrate-free double-sided adhesive sheet is obtained after peeling. The optical film is attached to the adhesive layer.

A film peeling mechanism which is a film peeling mechanism used in the film peeling method according to the above 1, comprising one or more conveying rollers that are in contact with the substrate-free double-sided adhesive sheet, and a conveying roller that transports the peeled light peeling film. A. The conveyance roller B of the substrate-free double-sided adhesive sheet after the peeling is conveyed, and the angle between the plane connecting the conveyance steering roller and the conveyance roller A and the plane connecting the conveyance steering roller and the conveyance roller B is 28 degrees or more.

8. The film peeling mechanism according to the above 7, further comprising: a conveying roller C for conveying the substrate-free double-sided adhesive sheet to the conveying steering roller, and a plane connecting the conveying steering roller and the conveying roller C and the connecting conveying roller and the conveying roller Plane of B The angle formed is more than 0 degrees. and

An optical film manufacturing apparatus using the optical film manufacturing apparatus according to the above-described method for producing an optical film having an adhesive layer, comprising an optical film bonded to an adhesive layer having no substrate double-sided adhesive sheet after peeling A film bonding mechanism and a film peeling mechanism as described in the above 7th.

According to the present invention, when the light release film is peeled off from the substrate-free double-sided adhesive sheet, it is possible to achieve stable peeling and inhibit adhesion of the adhesive.

The best aspect of implementing the invention

The film peeling method of the present invention is a film peeling method in which a light-peelable film is laminated on one side of the adhesive layer and a double-sided adhesive sheet is formed by continuously peeling off the film on the other side. The method is characterized in that the conveying direction of the lightly peeling film and/or the conveying direction of the substrate-free double-sided adhesive sheet after peeling are changed according to one or more conveying steering rollers that are in contact with the non-substrate double-sided adhesive sheet, The light-peelable film was peeled off from the portion where the substrate-free double-sided adhesive sheet was in contact with the conveying roller, and the angle (θ ₁ ) of the peeling surface of the substrate-free double-sided adhesive sheet after the peeling of the film was lightly removed to 28 degrees or more.

Here, the non-substrate double-sided adhesive sheet after peeling off indicates that the light release film is peeled off according to the film peeling method of the present invention, that is, the adhesive layer and the heavy release film are laminated without the substrate double-sided adhesive. sheet.

Fig. 1 is a side view showing the state of the film peeling method of the present invention, showing a state in which the light release film 3 is peeled off from the substrateless double-sided adhesive sheet 1. As shown in Fig. 1, the non-substrate double-sided adhesive sheet 1 is a light-peelable film 3 on one of the areas of the adhesive layer 2, and is peeled off from the film 4 in the other area. In the above-described peeling operation, only the light release film 3 is peeled off from the substrateless double-sided adhesive sheet 1, and the adhesive layer 2 and the heavy release film 4 are conveyed in a laminated state.

Next, the adhesive layer 2 will be described in detail. In the substrateless double-sided adhesive sheet 1, as shown in Fig. 1, the film 3 is lightly peeled off on one of the areas of the adhesive layer 2, and the film 4 is peeled off in the other area, and the peeling film is peeled off. At the time, it can adhere to the to-be-attached body. Examples of the adhesive used in the adhesive layer 2 include an acrylic adhesive, a polyester adhesive, and a polyurethane adhesive. For example, when the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive, the functional monomer-based monomer component which imparts adhesiveness to the main monomer component, the comonomer component which imparts adhesiveness and cohesive force, and the improved crosslinking connection point and adhesion is The main polymer or copolymer is composed. The main monomer component may, for example, be acrylic acid, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, benzyl acrylate or methoxyethyl acrylate. An alkyl ester, an alkyl methacrylate such as butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate or benzyl methacrylate. The comonomer component may, for example, be methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, styrene or acrylonitrile. The functional group-containing monomer component may, for example, be a carboxyl group-containing monomer such as acrylic acid, methacrylic acid, maleic acid or itaconic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate or acrylic acid 2- Hydroxypropyl ester, 2-hydroxypropyl methacrylate, N-methylol acrylamide, etc., hydroxyl-containing monomer, acrylamide, methacrylamide, glycidyl methacrylate, N-ethylene Porphyrin, N-propylene Porphyrin, N-(methyl) propylene oxime Porphyrin and the like. When these components are contained, the adhesion and cohesive force of the adhesive layer can be improved.

Further, since such an acrylic resin generally does not have an unsaturated bond in a molecule, it is possible to improve the stability to light and oxygen. Further, by appropriately selecting the monomer type and molecular weight, it is possible to obtain an adhesive composition having qualities and characteristics corresponding to the use. As the adhesive composition, any of a cross-linking type which performs cross-linking treatment and a non-cross-linking type which does not carry out cross-linking treatment can be used.

Further, in the adhesive composition used in the present invention, various additives such as an antioxidant, a plasticizer, a tackifier, and a stabilizer may be contained as needed. The average thickness of the adhesive layer 2 is not particularly limited, but is preferably 5 to 200 μm, more preferably 10 to 100 μm.

Further, the elastic modulus (modulus of elasticity) of the adhesive which can be used is usually about 1 × 10 ⁵ to 1 × 10 ⁷ Pa, preferably 1 × 10 ⁵ to 1 × 10 ⁶ Pa.

The non-substrate double-sided adhesive sheet 1 has the light release film 3 which is peeled off first, and the heavy release film 4 which is adhered to the adherend after the adhesive layer 2 is peeled off, and the peeling force of the light release film 3 on the adhesive layer 2 The set amount of the peeling force of the heavy release film 4 to the adhesive layer 2 is small, which can be achieved by appropriately setting the release agent layer. The peeling force of the light release film 3 to the adhesive layer 2 is preferably from 1 to 150 mN/25 mm, more preferably from 10 to 100 mN/25 mm. On the other hand, the peeling force of the heavy release film 4 to the adhesive layer 2 is preferably 50 to 200 mN/25 mm, more preferably 70 to 150 mN/25 mm. Further, when the peeling force of the heavy release film 4 is 1.2 times or more, preferably 1.4 times or more, when the light release film 3 is peeled off, it is preferable that the adhesive is not easily transferred to the light release film side when the light release film 3 is peeled off.

Specific examples of the light release film 3 and the heavy release film 4 include a structure in which a release agent layer is formed on the release sheet substrate. The material of the release sheet substrate is not particularly limited, and examples thereof include a polyester film such as a polyethylene terephthalate film or a polybutylene terephthalate film, a polyolefin film such as a polypropylene film or a polymethylpentene film, and a polycrystalline film. A plastic film such as a carbonate film, a metal foil such as aluminum or stainless steel, or a paper such as cellophane, high-quality paper, coated paper, impregnated paper, or synthetic paper. When a plastic film is used as the release sheet substrate, an oxidation method or an embossing method may be applied to one side of the release film layer of the plastic film for the purpose of improving the adhesion between the plastic film and the release agent layer. Such as physical or chemical surface treatment. The above oxidation method is, for example, corona discharge treatment, chromic acid treatment, fire treatment, hot gas treatment, ozone/ultraviolet irradiation treatment, or the like. Further, the embossing method is, for example, a sand blast method or a solvent treatment method. These surface treatment methods can be appropriately selected depending on the type of the release sheet substrate, but are generally suitable for corona discharge treatment from the viewpoint of effect and workability. Further, a primer process can also be performed.

The average thickness of the light release film 3 and the heavy release film 4 is not particularly limited, and is preferably from 10 to 200 μm, more preferably from 15 to 100 μm.

In the film peeling method of the present invention, as shown in Fig. 2(a), the transfer-oriented roll 5 is brought into contact with the side of the heavy-weight peeling film 4 of the substrate-free double-sided adhesive sheet 1, and the substrate-free double after peeling can be used. The conveying direction of the adhesive sheet 6 is changed to be heavy The film direction is peeled off; or as shown in Fig. 2(b), the conveyance direction of the light release film 3 can be changed to follow the conveyance roller 5 in contact with the side of the light release film 3 of the substrate-free double-sided adhesive sheet 1. The adhesive layer is opposite to the direction; or as shown in Fig. 3, by using two or more conveyance steering rolls 5, the conveyance directions of both the substrate-free double-sided adhesive sheet 6 and the light release film 3 after peeling can be changed. By providing this conveyance steering roller, the peeling position, the peeling angle, and the peeling speed of the baseless double-sided adhesive sheet can be fixed.

In the film peeling method of the present invention, the angle (θ ₁ ) from the peeling surface of the light release film 3 to the peeling surface of the substrate-free double-sided adhesive sheet 6 after peeling is 28 degrees or more, and preferably 28 to 95 degrees. 28 to 75 degrees is better. When the angle (θ ₁ ) is set to be less than 28 degrees, the non-substrate double-sided adhesive sheet 1 is directly conveyed by the conveyance roller 5 in a state in which the light release film 3 is not peeled off, and is peeled off at any position thereafter. The peeling position is not fixed. With this, the peeling angle and the peeling speed are not fixed, and the peeling of the contact portion with the conveying steering roller 5 cannot be performed, and the drawing of the surface of the adhesive layer is likely to be pulled toward the side of the light peeling film 3, and the drawing phenomenon is likely to occur. The adhesive is pulled back to the side of the heavy release film 4 so that the surface of the adhesive after peeling is liable to be rough. Further, when the angle (θ ₁ ) exceeds 95 degrees, the adhesive is largely stretched at the time of peeling, and the surface roughness is likely to occur throughout the adhesive layer depending on the type of the adhesive.

More specifically, when the angle (θ ₁ ) is the peeling mechanism viewed from the vertical direction (TD) of the substrate-free double-sided adhesive sheet 1, the light-peelable film 3 after peeling is conveyed by the conveying steering roller 5 and the second. The peeling side of the straight portion from the contact of the roller to the angle formed by the peeling side of the straight portion of the substrate-free double-sided adhesive sheet 6 by the conveyance steering roller 5 in contact with the next conveyance roller.

Further, in the film peeling method of the present invention, the transfer roller 5 is conveyed in contact with the side of the heavy-duty release film 4 of the substrate-free double-sided adhesive sheet 1, and the base-free double-sided adhesive sheet 6 after peeling is used as a starting point. The conveying direction (b) is changed to the side of the conveying steering roller 5, and the peeling of the substrate-free double-sided adhesive sheet 6 after peeling is performed by the direction of the conveyance direction (c) of the substrate-free double-sided adhesive sheet 1 before peeling. The angle formed by the surface (θ ₂ ) is preferably more than 0 degrees, and more preferably more than 28 degrees, more preferably 28 to 90 degrees, and particularly preferably 28 to 75 degrees. Further, when θ ₂ is θ ₁ -10 degrees to θ ₁ +10 degrees, it is preferably θ ₁ -5 degrees to θ ₁ +5 degrees, and the same angle as θ ₁ is the best, that is, before and after peeling, Only the conveying direction of the substrate-free double-sided adhesive sheet after peeling is changed, and the conveying direction of the lightly peeling film after peeling is preferably not changed. When this is satisfied, since the adhesive layer 2 is stretched and deformed at the time of peeling, a large shear force is caused at the interface between the light release film 3 and the adhesive layer 2, and the adhesive is easily peeled off, so that the adhesive is not easily attached to the light release film. 3. Further, the above θ _{2 is} always an angle of 180 degrees or less.

More specifically, when the angle (θ ₂ ) is the peeling mechanism viewed from the vertical direction (TD) of the substrate-free double-sided adhesive sheet 1, the direction in which the substrate double-sided adhesive sheet 1 is conveyed is not extended. After the peeling, the substrate-free double-sided adhesive sheet 6 is formed at an angle formed by the peeling side of the straight portion of the conveying steering roller 5 in contact with the next conveying roller.

In order to stabilize the peeling adhesive layer 2 and the heavy peeling film 4, the roll diameter of the conveying steering roller 5 is preferably small. The adhesive for the non-substrate double-sided adhesive sheet is stretched by the release film on both sides at the start of peeling, and the adhesive finally remains on the side of the heavy release film 4. The larger the roll diameter of the conveying steering roller 5, the longer the time during which the adhesive is stretched during peeling, and the adhesive is easily deformed. However, when the roll diameter of the conveying steering roller 5 is too small, in particular, when the substrateless double-sided adhesive sheet 1 having a thick and high-rigidity peeling film is used, the curved surface of the conveying steering roller 5 may not be followed. Specifically, the roll diameter of the conveying steering roller 5 is usually about 2 × 10 ² to 6 × 10 ⁴ times the thickness of the adhesive layer 2, preferably 1 × 10 ³ to 1 × 10 ⁴ times. As for the peeling speed, when θ ₁ and θ ₂ satisfy θ ₁ = θ ₂ , it is 1 to 60 m/min, and preferably 1 to 30 m/min, and more preferably 1 to 20 m/min. Further, when θ ₁ and θ ₂ satisfy θ ₂ ≦ θ ₁ ≦ θ ₂ + 50 degrees, it is preferably 1 to 10 m/min, and if θ ₂ + 50 degrees ≦ θ ₁ is satisfied, it is preferably 1 to 20 m/min.

The present invention also provides a method for producing an optical film comprising an adhesive layer, characterized in that after the light-peeling film is peeled off from the substrate-free double-sided adhesive sheet by the film peeling method, the substrate-free double-sided adhesive sheet after the obtained peeling is obtained. The optical film is attached to the adhesive layer. Specific examples of the optical film include a polarizing plate and a phase difference plate.

The polarizing plate is generally composed of a polarizing film having a three-layer structure in which an optically isotropic film such as a triacetyl cellulose (TAC) film is attached to both sides of a polyvinyl alcohol-based polarizer, and is attached to the liquid crystal cell on one side thereof. An adhesive layer is provided for the purpose of the optical member. The method for producing an optical film having an adhesive layer of the present invention is suitably applied to the method of providing an adhesive layer.

Further, in order to improve the viewing angle characteristics, a phase difference plate is disposed between the polarizing plate and the liquid crystal cell. The method for producing an optical film having an adhesive layer of the present invention is suitable for use in the provision of an adhesive layer as used herein. The method.

Next, as shown in Fig. 4, the present invention is a film peeling mechanism used in the above-described peeling method, and also provides one or more conveyance steering rolls 5 that are in contact with the substrate-free double-sided adhesive sheet 1, and the peeling is lightly peeled off. The conveying roller A (7) of the film 3, the conveying roller B (8) of the substrate-free double-sided adhesive sheet after peeling, and the plane connecting the conveying steering roller 5 and the conveying roller A (7) and the connecting conveying roller 5 And a film peeling mechanism having an angle of 28 degrees or more formed by the plane of the conveying roller B (8).

The film peeling mechanism described above further includes a conveying roller C (9) for conveying the substrateless double-sided adhesive sheet 1 to the conveying steering roller 5, and connecting the conveying roller 5 and the conveying roller C (9) to the plane and the connection conveying The film peeling mechanism having an angle of more than 0 degrees formed by the planes of the steering roller 5 and the conveying roller B (8) is preferable, and more preferably 28 degrees or more.

The conveyance steering roller and the conveyance rollers A to C are not particularly limited as long as they can convey the substrate-free double-sided adhesive sheet, the light release film, and the peel-free substrate-free double-sided adhesive sheet before peeling, and a metal roll is used. Resin coated rolls are available.

Further, as shown in Fig. 5, the present invention is an optical film manufacturing apparatus used in the above-described method for producing an optical film having an adhesive layer, and also provides an adhesive layer having a substrate-free double-sided adhesive sheet after peeling. The bonding mechanism 10 for bonding the optical film 14 and the optical film manufacturing apparatus 12 including the film peeling mechanism 11 described above.

It is preferable that the optical film manufacturing apparatus further includes a surface activation processing apparatus 13. The surface activation treatment device 13 may be a treatment mechanism for physical or chemical surface treatment such as the above-described oxidation method or embossing method; for example, a charge discharge treatment mechanism, a chromic acid treatment mechanism, a flame treatment mechanism, and a hot gas treatment mechanism , ozone / ultraviolet irradiation treatment mechanism, sand blasting treatment mechanism, solvent treatment mechanism, and the like. Among them, the corona discharge treatment mechanism is the best from the viewpoint of effect and operability.

Example

Hereinafter, the present invention will be described in detail based on examples and comparative examples, but the present invention is not limited by these examples.

<Evaluation method> (removed)

The non-substrate double-sided adhesive sheet 10 m was peeled off at a transport speed of 1, 3, 5, 10, 30, and 50 m/min, and the presence or absence of adhesion of the adhesive to the side of the light release film was visually confirmed, and it was judged by the following evaluation criteria.

○: no attachment

X: The transfer occurs, or the peeling position is changed to visually confirm the roughness of the adhesive surface due to drawing or the like.

(peel stability)

The presence or absence of turbulence and crepe in the peeling operation at a conveyance speed of 1, 3, 5, 10, 30, and 50 m/min was visually confirmed, and it was judged by the following evaluation criteria.

○: No turbulence and crepe

△: How many turbulences occur, but crepe does not occur

X: Confirm that there is turbulence and crepe

(Method for measuring peeling force)

The heavy release film side of the substrateless double-sided adhesive sheet was fixed to the backing plate, and the light release film was peeled off at a peeling angle of 180 degrees and a speed of 10 m/min, and the peeling force of the light release film was measured. After the light-peelable film was peeled off, the adhesive-free side-side polyester film was fixed on the backing plate, and the lightly peeled film was peeled off at a peeling angle of 180 degrees and a speed of 10 m/min, and the peeling of the heavy peeling film was measured. force.

(Example 1)

A light release film made of a polyethylene terephthalate (PET) film coated on a 38 μm thick polyethylene terephthalate (PET) film, with a thickness of 15 μm (for butyl acrylate (BA)) An adhesive layer composed of a monomer composition of methyl acrylate (MA) = 75:25, 100 parts by mass of a polymer, a crosslinking agent of BHS8515, which is prepared by adding a cross-linking agent, Toyo Ink, 1.5 parts by mass, and a solid content ratio. And adding a heavy release adhesive composed of a polyoxyxylene resin to the same polydimethylsiloxane degrading agent to form a peeling force by laminating a heavy release film produced from the same release sheet substrate as the above-mentioned light release film. There is a difference between the substrateless double-sided adhesive sheets. Here, the heavy-duty film side contact conveying roller (the roll diameter φ 50 mm, which is about 3300 times the thickness of the adhesive layer) of the substrate-free double-sided adhesive sheet, along with the transfer roller, the adhesive layer and the heavy release film The conveying direction is changed to the conveying roller side, so that the angle from the peeling surface of the lightly peeling film to the peeling surface of the substrate-free double-sided adhesive sheet after peeling (θ ₁ ), and the peeling of the substrate-free double-sided adhesive sheet after peeling off The angle (θ ₂ ) formed by the direction in which the transfer direction of the substrate-free double-sided adhesive sheet is not formed before the peeling is 30 degrees, and is conveyed at the respective conveyance speeds as shown in the first table and the second table, while the base is not provided. The light release film is peeled off at the contact position between the double-sided adhesive sheet and the conveyance steering roller (see Fig. 2(a)). Further, the peeling force of the light release film was 90 mN/25 mm, and the peeling force of the heavy release film was 150 mN/25 mm.

(Example 2)

The same procedure as in Example 1 was carried out except that the roll diameter of the conveyance steering roll was set to φ 150 mm.

(Example 3)

In addition to setting the peeling surface of the light-peelable film to the peeling surface of the substrate-free double-sided adhesive sheet (θ ₁ ), and the peeling surface of the substrate-free double-sided adhesive sheet after peeling to no peeling before the peeling The angle (θ ₂ ) formed by the direction in which the transport direction of the surface-adhesive sheet was extended was 70 degrees, and the same procedure as in the first embodiment was carried out.

(Example 4)

In addition to setting the peeling surface of the light-peelable film to the peeling surface of the substrate-free double-sided adhesive sheet (θ ₁ ), and the peeling surface of the substrate-free double-sided adhesive sheet after peeling to no peeling before the peeling The angle (θ ₂ ) formed by the direction in which the transport direction of the surface-adhesive sheet was extended was 90 degrees, and the same as in the first embodiment.

(Example 5) (Reference example)

In addition to the light-peeling film side contact conveying roller on the non-substrate double-sided adhesive sheet, the conveying direction of the lightly peeling film is changed to the conveying steering roller side along the conveying steering roller, so that the peeling surface of the lightly peeling film is peeled off The angle (θ ₁ ) of the peeling surface of the non-substrate double-sided adhesive sheet was carried out at 30 degrees, and was carried out in the same manner as in the first embodiment (see FIG. 2(b)).

(Example 6) (Reference example)

The same procedure as in Example 5 was carried out except that the angle (θ ₁ ) of the peeling surface of the light-removable film from the peeling surface of the light-removable film to the peeling surface of the substrate-free double-sided adhesive sheet was set to 90 degrees.

The adhesion caused by the release film and the peel stability were evaluated. The results are shown in Tables 1 and 2.

(Comparative Example 1)

In addition to setting the peeling surface of the light-peelable film to the peeling surface of the substrate-free double-sided adhesive sheet (θ ₁ ), and the peeling surface of the substrate-free double-sided adhesive sheet after peeling to no peeling before the peeling The angle (θ ₂ ) formed by the direction in which the transport direction of the surface-adhesive sheet was extended was 20 degrees, and the same as in the first embodiment.

In Examples 1 to 6 and Comparative Example 1, the adhesion caused by the release film and the peel stability were evaluated. The results are shown in Tables 1 and 2.

Industrial availability

In the film peeling method and the optical film manufacturing method of the present invention, it is possible to prevent the adhesive from being transferred to the light release film and to achieve stable peeling, and therefore it is suitable for a method of adhering the optical film with good efficiency.

1‧‧‧No substrate double-sided adhesive sheet

2‧‧‧Adhesive layer

3‧‧‧Light peeling film

4‧‧‧Repeat film

5‧‧‧Transport steering roller

6‧‧‧Non-substrate double-sided adhesive sheet after peeling

7‧‧‧Conveying roller A

8‧‧‧Conveying roller B

9‧‧‧Conveying roller C

10‧‧‧Mechanism

11‧‧‧film stripping mechanism

12‧‧‧Optical film manufacturing equipment

13‧‧‧Surface activation treatment device

14‧‧‧Optical film

a‧‧‧Light stripping film transport direction

b‧‧‧Transport direction of the substrate-free double-sided adhesive sheet after peeling

c‧‧‧Transport direction of the substrate-free double-sided adhesive sheet before peeling

d‧‧‧The direction of extension of the transport direction of the non-substrate double-sided adhesive sheet before peeling

θ ₁ ‧‧‧ Angle of the peeling surface of the substrate-free double-sided adhesive sheet from the peeling surface of the lightly peeling film to the peeling

θ ₂ . . . The angle formed by the direction of extension of the substrate-free double-sided adhesive sheet before peeling to the peeling surface of the substrate-free double-sided adhesive sheet after peeling

Fig. 1 is a side view showing a state in which a light release film is peeled off from a substrateless double-sided adhesive sheet.

Fig. 2(a) is a side view showing the film peeling step of the first embodiment. (b) is a side view showing the film peeling step of Example 5.

Figure 3 shows the transport direction of the light release film (a), the transport direction of the double-sided adhesive sheet without the substrate after peeling (b), and the film transport direction (c) without the substrate double-sided adhesive sheet before peeling. Side view of the stripping step.

Fig. 4 is a side view showing one aspect of the film peeling mechanism of the present invention.

Fig. 5 is a side view showing an aspect of the optical film manufacturing apparatus of the present invention.

3. . . Light release film

5. . . Conveying roller

6. . . Peel-free double-sided adhesive sheet after peeling

a. . . Light peeling film transport direction

b. . . The conveying direction of the non-substrate double-sided adhesive sheet after peeling

c. . . The conveying direction of the non-substrate double-sided adhesive sheet before peeling

d. . . The direction of extension of the substrate-free double-sided adhesive sheet before peeling

θ ₁ . . . The angle from the peeling surface of the lightly peeling film to the peeling surface of the substrate-free double-sided adhesive sheet after peeling

θ ₂ . . . The angle formed by the direction of extension of the substrate-free double-sided adhesive sheet before peeling to the peeling surface of the substrate-free double-sided adhesive sheet after peeling

Claims (9)

A film peeling method which is a film peeling method in which a light-peelable film is laminated on one side of an adhesive layer, and a film-free double-sided adhesive sheet is continuously peeled off from a light-peelable film on the other side thereof And one or more conveying steering rollers that are in contact with the non-substrate double-sided adhesive sheet, and the conveying direction of the non-substrate double-sided adhesive sheet after the light-peeling film is conveyed and/or peeled off, The light-peelable film is peeled off from the portion where the substrate-free double-sided adhesive sheet is in contact with the conveying roller, and the angle (θ ₁ ) of the peeling surface of the light-peelable film to the peeling surface of the substrate-free double-sided adhesive sheet after peeling is 28 degrees Above; following the conveying steering roller in contact with the heavy-peeling film side of the substrate-free double-sided adhesive sheet, the conveying direction of the peeled substrate-free double-sided adhesive sheet is changed to the conveying deflection roller contacting the side of the heavy peeling film On the side, the angle (θ ₂ ) formed by the direction in which the substrate-free double-sided adhesive sheet is peeled off before peeling and the peeled surface of the substrate-free double-sided adhesive sheet after peeling is within θ ₁ ±10 degrees. The film peeling method according to claim 1, wherein the θ ₂ is 28 degrees or more and 90 degrees or less. The film peeling method of claim 1, wherein the θ ₁ and θ _{2 are} at the same angle. The film peeling method of claim 1, wherein the conveying roller is in contact with the heavy peeling film side of the substrateless double-sided adhesive sheet. The film peeling method according to claim 1, wherein the substrate-less double-sided adhesive sheet has a conveying speed of 1 to 50 m/min. The film peeling method of claim 1, wherein the conveying roller has a roll diameter of 2 × 10 ² to 6 × 10 ⁴ times the thickness of the adhesive layer. A method for producing an optical film having an adhesive layer, characterized in that the film peeling method according to the first aspect of the patent application is characterized in that the light-peelable film is peeled off from the substrate-free double-sided adhesive sheet, and the substrate is peeled off after the obtained peeling An optical film is attached to the adhesive layer of the adhesive sheet. A film peeling mechanism which is used in a film peeling mechanism of the film peeling method according to the first aspect of the patent application, and which has one or more conveyance steering rolls that are in contact with the substrate-free double-sided adhesive sheet, and is peeled off and peeled off. The conveying roller A of the film, the conveying roller B of the substrate-free double-sided adhesive sheet after the peeling is conveyed, the double-sided adhesive sheet without the substrate is conveyed to the conveying roller C of the conveying steering roller; and the conveying steering roller and the conveying roller A are connected The plane forms an angle of 28 degrees or more with the plane connecting the conveying steering roller and the conveying roller B; the angle between the plane connecting the conveying steering roller and the conveying roller C and the plane connecting the conveying steering roller and the conveying roller B is a connecting conveying roller And the plane of the conveying roller A and the plane connecting the conveying steering roller and the conveying roller B are formed within an angle of ±10 degrees. An optical film manufacturing apparatus for use in an optical film manufacturing apparatus for manufacturing an optical film having an adhesive layer according to claim 7 of the patent application, comprising an adhesive layer having no substrate double-sided adhesive sheet after peeling A bonding mechanism for bonding an optical film, and a film peeling mechanism according to claim 8 of the patent application.