KR20110074748A - Film-peeling method, process for production of optical film, film-peeling mechanism, and apparatus for production of optical film - Google Patents

Abstract

A light-release film is continuously laminated on one side of the pressure-sensitive adhesive layer and a light-release film is laminated from a substrate-less double-sided adhesive sheet formed by laminating a heavy-release film on the other side. As a film peeling method to peel, there is no base material, changing the conveyance direction of a light peeling film and / or the conveyance direction of the base material without a base material after peeling along one or more conveyance turning rolls which contact a double-sided adhesive sheet without a base material. The light peeling film is peeled from the part which is in contact with the conveyance conversion roll of a double-sided adhesive sheet, and the angle (theta) ₁ from the peeling surface of a light peeling film to the peeling surface of the double-sided adhesive sheet without peeling is 28 degrees or more. By the film peeling method, when peeling a light peeling film from a double-sided adhesive sheet without a base material, the film manufacturing method which implements stable peeling and suppression of electrodeposition is prepared. The.

Description

Film peeling method, optical film manufacturing method, film peeling mechanism and optical film manufacturing apparatus {FILM-PEELING METHOD, PROCESS FOR PRODUCTION OF OPTICAL FILM, FILM-PEELING MECHANISM, AND APPARATUS FOR PRODUCTION OF OPTICAL FILM}

This invention relates to the peeling method of a substrate-less double-sided adhesive sheet, the manufacturing method of an optical film, a film peeling mechanism, and an optical film manufacturing apparatus. More specifically, when peeling a light peeling film from a double-sided adhesive sheet without a base material having a difference in peeling force between the light-release film and the pressure-sensitive adhesive layer, the heavy-release film and the pressure-sensitive adhesive layer. It is related with the film peeling method which can suppress the electrodeposition of the adhesive with respect to a peeling film, and the manufacturing method of the optical film using this film peeling method.

As a big problem of the double-sided adhesive sheet without the base material which has a light peeling film and a heavy peeling film which differs in peeling force in an adhesive layer, when peeling a light peeling film, it cannot perform stable peeling and a roughness arises or light peeling on an adhesive surface. The generation | occurrence | production of the electrodeposition of the adhesive with respect to a film is mentioned. In order to suppress electrodeposition, the method of enlarging the difference of the peeling force of a heavy peeling film and the peeling force of a hard peeling film, etc. are examined, but complete suppression of electrodeposition was not reached.

Moreover, in patent document 1, when peeling an adhesive film from to-be-adhered bodies, such as a liquid crystal display panel, a part of adhesive film is pulled off and it peels off by peeling and peeling an adhesive film, peeling it, and rotating it at regular intervals. Is disclosed so that the adhesive film peeling method in which streaks and the like do not occur on the adhesive surface is disclosed, and in Reference Document 2, when peeling the optical member, the peeling sheet is matched and then the optical member is attached together with the peeling sheet. Although the peeling method which does not damage a mating member by peeling is disclosed, the method of continuously peeling a light peeling film from a double-sided adhesive sheet without a base material does not have enough discussion on a mechanical surface, and film peeling which implements stable peeling is realized. The method is unknown.

Japanese Patent Application Laid-Open No. 8-292433 Japanese Patent Application Laid-Open No. 2002-40259

This invention is made | formed in view of the said problem, and makes it a subject to provide the film peeling method which realizes stable peeling and suppression of electrodeposition when peeling a light peeling film from a double-sided adhesive sheet without a base material.

MEANS TO SOLVE THE PROBLEM In order to achieve the said objective, the present inventors earnestly examined and found that the said subject can be solved by peeling a light peeling film at a specific angle so that one or more conveying turning rolls may contact a double-sided adhesive sheet without a base material. Completed.

That is, the present invention

1.A film peeling method in which a light peeling film is continuously peeled from a double-sided adhesive sheet without a base material on which a light peeling film is laminated on one side of the pressure-sensitive adhesive layer and a heavy peeling film is laminated on the other side. From the part which is in contact with the conveyance deflection roll of a double-sided adhesive sheet without a base material, changing the conveyance direction of a light-peelable film, and / or the conveyance direction of the double-sided adhesive sheet without a base material after peeling along one or more conveyance deflection rolls which contact | attach to The film peeling method which peels a light peeling film and whose angle (theta) ₁ from the peeling surface of a light peeling film to the peeling surface of the double-sided adhesive sheet without a base material after peeling is 28 degrees or more,

2. The conveyance direction of the double-sided adhesive sheet without a base material after peeling is changed to the said conveying direction roll side along the conveyance turning roll which contacts the heavy peeling film side of the double-sided adhesive sheet without the said base material, and the double-sided adhesive sheet without the base material before peeling is carried out. The film peeling method of the said 1 base material which makes angle (theta) ₂ which the peeling surface of the double-sided adhesive sheet without a base material after peeling from the extending direction of a conveyance direction makes more than 0 degree and 180 degrees or less,

3. Film peeling method of said 2 base material whose said (theta) ₁ and (theta) ₂ are the same angle,

4. The film peeling method of said 1 base material whose conveyance speed of the double-sided adhesive sheet without the said base material is 1-50 m / min,

5. The film peeling method of said 1 base material whose roll diameter of the said conveyance deflection roll is 2 * 10 <^2> -6 * 10 <^4> times the film thickness of the said adhesive layer,

6. An optical film is affixed on the adhesive layer surface of the double-sided adhesive sheet without a base material obtained by peeling a light peeling film from the double-sided adhesive sheet without a base material by the film peeling method of said 1 description. Manufacturing method of layered optical film,

7. As film peeling mechanism used for the film peeling method of said 1 base material, one or more conveying conversion rolls which contact a double-sided adhesive sheet without a base material, and the conveyance roll A which conveys the peeled hard peeling film, and both sides without the base material after peeling The film peeling mechanism which has a conveyance roll B which conveys an adhesive sheet, and the angle which the plane which contact | connects a conveyance deflection roll and the conveyance roll A, and the plane which contact | connects the conveyance deflection roll and the conveyance roll B is 28 degree or more,

8. The conveyance roll C which has a conveyance roll C which conveys the double-sided adhesive sheet which does not have a base material in a conveyance turning roll further, the plane which contact | connects a conveyance deflection roll and the conveyance roll C, and the plane which contact | connects the conveyance deflection roll and the conveyance roll B is 0. The film peeling mechanism of the said 7 base material over degree, and

9. The optical film manufacturing apparatus used for the manufacturing method of the optical film with an adhesive layer of said 6, The bonding mechanism which bonds an optical film to the adhesive layer surface of the double-sided adhesive sheet without a base material after peeling, and the film peeling of the said 7 base material An optical film manufacturing apparatus having a mechanism is provided.

According to this invention, when peeling a light peeling film from a double-sided adhesive sheet without a base material, stable peeling and suppression of electrodeposition of an adhesive can be implement | achieved.

1 is a side view showing a state in which a light peeling film is peeled from a double-sided adhesive sheet without a base material.
In FIG. 2, (a) is a side view which shows the film peeling process in Example 1. FIG. (b) is a side view which shows the film peeling process in Example 5. FIG.
3 shows a film peeling step in which the conveyance direction (a) of the light peeling film, the conveyance direction (b) of the double-sided adhesive sheet without base material after peeling, and the conveyance direction (c) of the double-sided adhesive sheet without base material before peeling, respectively differed. Side view.
It is a side view which shows one aspect of the film peeling mechanism of this invention.
It is a side view which shows one aspect of the optical film manufacturing apparatus of this invention.

The film peeling method of this invention is a film peeling method which continuously peels a light peeling film from the double-sided adhesive sheet which does not have a base material by which a light peeling film is laminated on one side of an adhesive layer, and a heavy peeling film is laminated on the other side, The conveying deflecting roll of the uncoated double-sided adhesive sheet without changing the conveying direction of the light-peelable film and / or the conveying direction of the uncoated double-sided adhesive sheet after peeling along one or more conveying deflecting rolls touching the double-sided adhesive sheet without adhesive; The light peeling film is peeled from the part which is in contact, and the angle (theta) ₁ from the peeling surface of a light peeling film to the peeling surface of the double-sided adhesive sheet without a base material after peeling is characterized by 28 degrees or more.

Here, the double-sided adhesive sheet without base material after peeling shows the double-sided adhesive sheet without base material in the state in which the light peeling film peeled by the film peeling method of this invention, ie, the state in which the adhesive layer and the heavy peeling film were laminated | stacked.

FIG. 1: is a side view which shows the state which the light peeling film 3 peels from the double-sided adhesive sheet 1 without a base material in one aspect of the film peeling method of this invention. As shown in FIG. 1, in the double-sided adhesive sheet 1 without a base material, the light peeling film 3 is laminated | stacked on one side of the adhesive layer 2, and the heavy peeling film 4 is laminated | stacked on the other side. By the said peeling, only the light peeling film 3 is peeled from the double-sided adhesive sheet 1 without a base material, and the adhesive layer 2 and the heavy peeling film 4 are conveyed in the laminated state.

Next, the adhesive layer 2 is demonstrated in detail. In the double-sided adhesive sheet 1 without a base material, as for the adhesive layer 2, as shown in FIG. 1, the light peeling film 3 was laminated | stacked on one side, and the heavy peeling film 4 was laminated | stacked on the other side, It is possible to stick to a to-be-adhered body by peeling each peeling film. As an adhesive used for the adhesive layer 2, an acrylic adhesive, a polyester adhesive, a urethane type adhesive, etc. are mentioned, for example. For example, when the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive, a polymer mainly comprising a main monomer component for imparting adhesiveness, a comonomer component for imparting adhesion or cohesion, a functional group-containing monomer component for crosslinking point or adhesion improvement, or It can comprise with a copolymer. Examples of the main monomer component include alkyl acrylates such as ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, benzyl acrylate and methoxyethyl acrylate, butyl methacrylate, And methacrylic acid alkyl esters such as 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and benzyl methacrylate. As a comonomer component, methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, styrene, acrylonitrile etc. are mentioned, for example. As a functional group containing monomer component, For example, carboxyl group-containing monomers, such as acrylic acid, methacrylic acid, maleic acid, and itaconic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and 2-hydroxypropyl acrylate. Hydroxyl group-containing monomers such as 2-hydroxypropyl methacrylate and N-methylol acrylamide, acrylamide, methacrylamide, glycidyl methacrylate, N-vinyl morpholine, N-allyl morpholine, N- (meth) acryloyl morpholine etc. are mentioned. By including each of these components, the adhesive force and cohesion force of an adhesive layer improve.

Moreover, since such an acrylic resin does not have an unsaturated bond in a molecule | numerator normally, the stability with respect to light and oxygen can be aimed at. Moreover, the adhesive composition provided with the quality and characteristic according to a use can be obtained by suitably selecting the kind and molecular weight of a monomer. In such an adhesive composition, you may use either the crosslinking type which carried out the crosslinking process, and the non-crosslinking type which does not perform the crosslinking process.

Moreover, various additives, such as antioxidant, a plasticizer, a tackifier, and a stabilizer, may be contained in the adhesive composition used for this invention as needed. Although the average thickness of the adhesive layer 2 is not specifically limited, It is preferable that it is 5-200 micrometers, and it is more preferable that it is 10-100 micrometers.

Further, the elastic modulus of the pressure-sensitive adhesive that can be used is usually about ^{1 × 10 5 ~1 × 10 7} Pa, it is preferred if the 1 × 10 ⁵ ~10 ⁶ Pa.

The double-sided adhesive sheet 1 without a base material is provided with the light peeling film 3 which peels first and the heavy peeling film 4 peeled after affixing the adhesive layer 2 to a to-be-adhered body, and the light peeling film 3 The peeling force with respect to the adhesive layer 2 of this is made into a predetermined amount smaller than the peeling force with respect to the adhesive layer 2 of the heavy peeling film 4, etc. by providing a peeling agent layer suitably. It is preferable that it is 1-150mN / 25mm, and, as for the peeling force with respect to the adhesive layer 2 of the light peeling film 3, it is more preferable that it is 10-100mN / 25mm. On the other hand, it is preferable that it is 50-200mN / 25mm, and, as for the peeling force with respect to the adhesive layer 2 of the heavy peeling film 4, it is more preferable that it is 70-150mN / 25mm. Moreover, when the peeling force of the heavy peeling film 4 has the peeling force of 1.2 times or more, Preferably it is 1.4 times or more with respect to the peeling force of the light peeling film 3, when an adhesive peels when peeling the light peeling film 3, It is preferable at the point which becomes difficult to electrodeposit on the light peeling film side.

As a specific example of the light peeling film 3 and the heavy peeling film 4, what has a structure in which the release agent layer was formed in the release sheet base material is mentioned. Although the material of a release sheet base material is not specifically limited, For example, polyester films, such as a polyethylene terephthalate film and a polybutylene terephthalate film, polyolefin films, such as a polypropylene film and a polymethyl pentene film, a polycarbonate film, etc. It consists of metal foils, such as a plastic film, aluminum, and stainless steel, paper, such as glassine paper, fine paper, coated paper, impregnated paper, and synthetic paper. When using a plastic film as a release sheet base material, the physical or chemical surface, such as an oxidation method and an uneven | corrugated method, is made to the surface of the side in which the release agent layer of the said plastic film is installed as desired for the purpose of improving the adhesiveness of a plastic film and a release agent layer. The process can be performed. Examples of the oxidation method include corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and the like. . Although these surface treatment methods are suitably selected according to the kind of release sheet base material, generally, the corona discharge treatment method is used preferably from a viewpoint of an effect, operability, etc. Moreover, you may perform a primer process.

Although the average thickness of the light peeling film 3 and the heavy peeling film 4 is not specifically limited, It is preferable that it is 10-200 micrometers, and it is more preferable that it is 15-100 micrometers.

In the film peeling method of this invention, as shown in FIG.2 (a), there is no base material after peeling along the conveyance deflecting roll 5 which touches the heavy peeling film 4 side of the double-sided adhesive sheet 1 without a base material. The conveyance direction roll which touches the conveyance direction of the double-sided adhesive sheet 6 to the heavy peeling film direction, and touches the light peeling film 3 side of the double-sided adhesive sheet 1 without a base material as shown in FIG. 2 (b). Along with (5), you may change the conveyance direction of the light peeling film 3 to the opposite direction of an adhesive layer, or as shown in FIG. 3, double-sided adhesion without the base material after peeling using two or more conveying turning rolls 5 You may change the conveyance direction of both the sheet | seat 6 and the light peeling film 3, respectively. By providing this conveyance turning roll, the peeling position, peeling angle, and peeling speed of the double-sided adhesive sheet without a base material can be made constant.

In the film peeling method of this invention, the angle (theta) ₁ from the peeling surface of the light peeling film 3 to the peeling surface of the double-sided adhesive sheet 6 without the base material after peeling is 28 degrees or more, Preferably it is 28 It is -95 degrees, More preferably, it is 28-75 degrees. When the angle θ ₁ is set to less than 28 degrees, the conveyance redirecting roll 5 is passed from the double-sided adhesive sheet 1 without the base material without peeling off the light peeling film 3, and then at an arbitrary position. Because of peeling, the peeling position is not constant. As a result, the peeling angle and the peeling speed also become inconsistent states, so that stable peeling cannot be performed at the portion in contact with the conveyance redirecting roll 5, and a part of the surface of the pressure-sensitive adhesive layer is held toward the light peeling film 3 side. The phenomenon which stretches like a pulled thread tends to occur, and roughness arises easily on the adhesive surface after peeling by returning the adhesive to the heavy peeling film 4 side. Moreover, when the said angle (theta) ₁ exceeds 95 degree | times, since adhesive increases significantly at the time of peeling, the roughness of the surface becomes easy to generate | occur | produce over the whole of an adhesive layer depending on the kind of adhesive.

More specifically, the angle (θ ₁ ) means that the light peeling film (3) after peeling passes through the conveying turning roll (5) when the peeling mechanism is viewed in the vertical direction (TD) of the double-sided pressure-sensitive adhesive sheet (1) having no substrate. From the peeling side of the linear part until it touches the next conveyance roll, the double-sided adhesive sheet 6 without a base material passes through the conveying turning roll 5, and the peeling side of the linear part until it contacts the next conveyance roll. The angle to make up.

Moreover, in the film peeling method of this invention, the double-sided adhesive sheet 6 without a base material after peeling along the conveyance deflecting roll 5 which touches the heavy peeling film 4 side of the double-sided adhesive sheet 1 without a base material based on this. The double-sided adhesive sheet 6 without a base material after peeling is changed from the extending direction of the conveyance direction (c) of the double-sided adhesive sheet 1 without the base material before peeling, changing the conveyance direction (b) of the conveyance direction roll (5) side. It is preferable to exceed the angle (theta) _{2 made} to the peeling surface of 0 degree | times, It is more preferable to exceed 28 degree | times, It is more preferable to set it as 28-90 degree, It is especially preferable to set it as 28-75 degree. In addition, θ ₂ is preferably θ ₁ -10 degrees to θ ₁ +10 degrees, more preferably θ ₁ -5 degrees to θ ₁ +5 degrees, and has the same angle as θ ₁ , that is, the substrate after peeling before and after peeling. It is most preferable that only the double-sided adhesive sheet without the adhesive changes the conveying direction, and that the conveying direction does not change in the light peeling film conveying direction after peeling. By satisfying this, since the pressure-sensitive adhesive layer 2 stretches and deforms at the time of peeling, a larger shear force acts at the interface between the light-peelable film 3 and the pressure-sensitive adhesive layer 2, thereby making it easier to peel. It becomes difficult to attach to). Moreover, θ ₂ is always 180 degrees or less.

The said angle (theta) ₂ is the extension direction of the conveyance direction of the double-sided adhesive sheet 1 without the base material before peeling more specifically, when the peeling mechanism is seen from the vertical direction (TD) of the double-sided adhesive sheet 1 without a base material. It is the angle which the double-sided adhesive sheet 6 without the base material after peeling passes through the conveyance turning roll 5, and to the peeling side of the linear part until it contacts the next conveyance roll.

It is preferable that the diameter of the conveyance redirecting roll 5 is small in order to peel the adhesive layer 2 and the heavy peeling film 4 stably. The adhesive of the double-sided adhesive tape without a base material is extended from the peeling film of both sides at the time of peeling start, and an adhesive remains on the heavy peeling film 4 side finally. The larger the diameter of the conveyance redirecting roll 5 is, the longer the time the pressure-sensitive adhesive is increased at that time, and the deformation of the pressure-sensitive adhesive tends to remain. However, when the diameter of the conveyance deflecting roll 5 is too small, especially the double-sided adhesive sheet 1 without the base material using the high rigidity peeling film, such as thick, cannot follow the curved surface of the conveyance deflecting roll 5, There is a possibility. Specifically, the diameter of the conveyance redirecting roll 5 is usually about 2 × 10 ² to 6 × 10 ⁴ times the film thickness of the pressure-sensitive adhesive layer 2, and preferably 1 × 10 ^{3 to} 1 × 10 ⁴ times. Regarding the peeling rate, when θ ₁ and θ ₂ satisfy θ ₁ = θ ₂ , it is 1 to 60 m / min, 1 to 30 m / min is preferable, and 1 to 20 m / min is more preferable. Further, θ ₁ and θ ₂ is θ ₂ ≤θ ₁ ≤θ ₂ if satisfying the +50 degree if 1~10m / min, θ ₂ + 50 also satisfies the ≤θ ₁ is preferably 1~20m / minute .

This invention sticks an optical film to the adhesive layer surface of the double-sided adhesive sheet which does not have a base material after peeling obtained by peeling a light peeling film from the double-sided adhesive sheet without a base material by the said film peeling method with the adhesive layer characterized by the above-mentioned. Also provided is a method for producing an optical film. As a specific example of the said optical film, a polarizing plate and a retardation plate are mentioned.

The polarizing plate is generally made of a polarizing film having a three-layer structure in which an optically isotropic film, for example, a triacetyl cellulose (TAC) film, is bonded to both surfaces of a polyvinyl alcohol polarizer, and one side thereof is formed of a liquid crystal cell or the like. An adhesive layer is provided for the purpose of sticking to an optical component. The manufacturing method of the optical film with an adhesive layer of this invention is used suitably as a method of providing this adhesive layer.

Moreover, in order to improve the viewing angle characteristic, the retardation plate may be arrange | positioned through an adhesive between a polarizing plate and a liquid crystal cell. As a method of providing the adhesive layer used here, the manufacturing method of the optical film with an adhesive layer of this invention is used suitably.

Next, as shown in FIG. 4, this invention is a film peeling mechanism used for the said film peeling method, The one or more conveying turning rolls 5 which contact | connect the double-sided adhesive sheet 1 without a base material, and the peeled light peeling film ( It has a conveyance roll A (7) which conveys 3), and the conveyance roll B (8) which conveys the double-sided adhesive sheet without a base material after peeling, and the plane and conveyance which contact | connect the conveyance conversion roll 5 and the conveyance roll A (7) It also provides the film peeling mechanism whose angle which the plane which contact | connects the turning roll 5 and the conveyance roll B8 makes is 28 degree or more.

The film peeling mechanism further has a conveying roll C 9 for conveying the double-sided adhesive sheet 1 having no substrate in the conveying redirecting roll 5, and is in contact with the conveying redirecting roll 5 and the conveying roll C 9. It is preferable that the angle which a plane and the plane which contact | connects the conveyance conversion roll 5 and the conveyance roll B8 makes is more than 0 degree, and it is more preferable that it is 28 degree or more.

About the said conveyance turning rolls and conveying rolls A-C, if it can convey the double-sided adhesive sheet without the base material before peeling, the light peeling film, and the double-sided adhesive sheet without the base material after peeling, it will not specifically limit, Even if a metal roll is used, Or a resin coating roll may be used.

This invention is further an optical film manufacturing apparatus used for the manufacturing method of the said optical film with an adhesive layer as shown in FIG. 5, Bonding which bonds the optical film 14 to the adhesive layer surface of the double-sided adhesive sheet without a base material after peeling. Also provided is an optical film manufacturing apparatus 12 having a mechanism 10 and the film peeling mechanism 11.

It is preferable that the optical film manufacturing apparatus further has a surface activation treatment mechanism 13. The surface activation treatment mechanism 13 may be a treatment mechanism capable of performing physical or chemical surface treatment such as the oxidation method or the concavo-convex method described above, and for example, a corona discharge treatment mechanism, a chromic acid treatment mechanism, a flame treatment mechanism, and a hot air treatment mechanism. , Ozone-ultraviolet irradiation treatment mechanism, sand blast treatment mechanism, solvent treatment mechanism, and the like. Of these, corona discharge treatment mechanisms are most preferred in terms of effects and operability.

Example

Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not restrict | limited at all by these examples.

<Evaluation Method>

(Electrodeposition)

After peeling at a conveyance speed of 1, 3, 5, 10, 30, and 50 m / min with respect to 10 m of double-sided adhesive sheets without a base material, the presence or absence of the electrodeposition of the adhesive with respect to the light peeling film side was checked visually, and the following evaluation criteria Judging.

○: no electrodeposition

X: Electrodeposition occurs or peeling position changes, and the roughness by pulling a thread to an adhesive surface is visually confirmed.

(Peelability)

Fluttering and the generation | occurrence | production of a wrinkle during the peeling operation | work at conveyance speeds 1, 3, 5, 10, 30, and 50 m / min were visually confirmed, and the following evaluation criteria were determined.

○: no flutter, no wrinkles

(Triangle | delta): Although fluttering generate | occur | produced somewhat, it does not reach a wrinkle.

×: flapping is confirmed, wrinkles are generated

(Measuring method of peeling force)

The heavy peeling film side of the double-sided adhesive sheet without a base material was fixed to the mounting plate, the light peeling film was pulled off at 180 degree of peeling angles, and the speed of 10 m / min, and the peeling force of the light peeling film was measured. About the double-sided adhesive sheet without the base material after peeling this light peeling film, the adhesive side is fixed to the said backing plate through a polyester film, the peeling film is peeled off at a peeling angle of 180 degree and a speed of 10 m / min, and the Peeling force was measured.

Example 1.

A light peeling film formed by applying a polydimethyl siloxane release agent to a polyethylene terephthalate (PET) film having a thickness of 38 μm, and a pressure-sensitive adhesive having a thickness of 15 μm (butyl acrylate (BA): methyl acrylate (MA) = 75: 25) The polyvinyl siloxane-based release agent was added to the pressure-sensitive adhesive layer consisting of BHS8515 made from Dongyang ink as a crosslinking agent (all in terms of solid ratio)) and the same release sheet substrate as the light release film. By laminating the heavy peeling film manufactured by adding the heavy peeling additive which consists of silicone resin, the double-sided adhesive sheet which does not have the base material which made the difference of peeling force was manufactured. The conveying direction of an adhesive layer and a heavy peeling film is moved along the said conveying turning roll so that a conveying turning roll (roll diameter φ50mm, about 3300 times of adhesive thickness) may reach the heavy peeling film side of this double-sided adhesive sheet without this base material. Double sided adhesive sheet without base material before peeling from side to side, angle (θ ₁ ) from peeling surface of light peeling film to peeling surface of double-sided adhesive sheet without base material after peeling and peeling surface of double-sided adhesive sheet without base material after peeling The light-peelable film in the contact portion of the double-sided adhesive sheet without a substrate and the conveying redirecting roll while conveying at each conveying speed shown in Tables 1 and 2 so that the angle (θ ₂ ) formed by the extending direction of the conveying direction of the sheet was 30 degrees. Peeling (refer FIG. 2 (a)). In addition, the peeling force of the light peeling film was 90 mN / 25 mm, and the peeling force of the heavy peeling film was 150 mN / 25 mm.

Example 2

It carried out similarly to Example 1 except having made the diameter of a conveyance turning roll into (phi) 150mm.

Example 3

In the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate before the peeling from the peeling surface of the light separation film foil pressure sensitive adhesive double coated sheet is not an angle (θ ₁₎ and the base material after peeling to the delaminated surface of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the front and rear surfaces of It carried out similarly to Example 1 except having made angle (theta) _{2 made} to an extension direction 70 degree | times.

Example 4

In the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate before the peeling from the peeling surface of the light separation film foil pressure sensitive adhesive double coated sheet is not an angle (θ ₁₎ and the base material after peeling to the delaminated surface of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the front and rear surfaces of It carried out similarly to Example 1 except having made angle (theta) _{2 made} to an extension direction 90 degrees.

Example 5

Double-sided adhesive without base material after peeling from the peeling surface of a light-peelable film, changing the conveyance direction of a mirror-surface peeling film along the said conveyance turning roll to the conveyance turning roll side so that a conveyance turning roll may reach the hard peeling film side of a double-sided adhesive sheet without a base material. It carried out similarly to Example 1 except having conveyed so that the angle (theta) ₁ to the peeling surface of a sheet might be 30 degree | times (refer FIG. 2 (b)).

Example 6

It carried out similarly to Example 5 except having set angle (theta) ₁ to 90 degrees from the peeling surface of a light peeling film to the peeling surface of the double-sided adhesive sheet without a base material after peeling.

It evaluated about electrodeposition and peeling stability by peeling of a film. The results are shown in Tables 1 and 2.

Comparative Example 1

In the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate before the peeling from the peeling surface of the light separation film foil pressure sensitive adhesive double coated sheet is not an angle (θ ₁₎ and the base material after peeling to the delaminated surface of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the front and rear surfaces of It carried out similarly to Example 1 except having made the angle (theta) _{2 made} to an extension direction 20 degrees.

Electrodeposition and peeling stability by peeling of the film in Examples 1-6 and Comparative Example 1 were evaluated. The results are shown in Tables 1 and 2.

TABLE 1

TABLE 2

Industrial availability

Since the film peeling method of this invention and the manufacturing method of an optical film can suppress the electrodeposition of the adhesive with respect to a light peeling film, and can implement stable peeling, it is very suitable by the method etc. which match together an optical film efficiently.

1: double sided adhesive sheet without base material
2: adhesive layer
3: light peeling film
4: heavy peeling film
5: conveying roll
6: double sided adhesive sheet without base material after peeling
7: conveying roll A
8: conveying roll B
9: conveying roll C
10: bonding apparatus
11: film peeling apparatus
12: optical film manufacturing apparatus
13: surface activation treatment apparatus
14: optical film
a: conveyance direction of a light peeling film
b: conveyance direction of the double-sided adhesive sheet without base material after peeling
c: conveyance direction of the double-sided adhesive sheet without base material before peeling
d: Extension direction of the conveyance direction of the double-sided adhesive sheet without base material before peeling
θ _1: an angle of the foil to the front and back surfaces of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the peeling surface of the peeling film path
θ _2: angle to the delaminated surface of the double-sided pressure-sensitive adhesive sheet without a substrate after peeling from the direction of extension of the transport direction of the double-sided pressure-sensitive adhesive sheet without a substrate prior to forming the peeling

Claims (9)

A light-release film is continuously laminated on one side of the pressure-sensitive adhesive layer and a light-release film is laminated on the other side, and the light-release film is continuously formed from a substrate-less double-sided adhesive sheet. As a film peeling method to peel, there is no base material, changing the conveyance direction of a light peeling film and / or the conveyance direction of the base material without a base material after peeling along one or more conveyance turning rolls which contact a double-sided adhesive sheet without a base material. The light peeling film is peeled from the part which is in contact with the conveyance deflection roll of a double-sided adhesive sheet, and the angle (theta) ₁ from the peeling surface of a light peeling film to the peeling surface of the double-sided adhesive sheet without a base material after peeling is 28 degrees or more. Film peeling method. The method according to claim 1,
The conveyance direction of the double-sided adhesive sheet without a base material after peeling is changed to the said conveyance redirecting roll side along the conveyance turning roll which touches the heavy peeling film side of the double-sided adhesive sheet without the said base material, and the conveyance direction of the double-sided adhesive sheet without base material before peeling The film peeling method of making angle (theta) ₂ which the peeling surface of the double-sided adhesive sheet without a base material after peeling from the extension direction of into more than 0 degree and 180 degrees or less. The method according to claim 2,
The film peeling method in which said (theta) ₁ and (theta) ₂ are the same angle. The method according to claim 1,
The film peeling method whose conveyance speed of the double-sided adhesive sheet without the said base material is 1-50 m / min. The method according to claim 1,
The film peeling method whose roll diameter of the said conveyance conversion roll is 2 * 10 <^2> -6 * 10 <^4> times the film thickness of the said adhesive layer. An optical film is affixed on the adhesive layer surface of the double-sided adhesive sheet without the base material after peeling which peels a light peeling film from the double-sided adhesive sheet without a base material by the film peeling method of Claim 1, The adhesive layer characterized by the above-mentioned Method for producing an optical film. As a film peeling mechanism used for the film peeling method of Claim 1, the conveyance roll A which conveys the 1 or more conveying conversion roll which touches the double-sided adhesive sheet without a base material, and the peeled light peeling film, and the double-sided adhesion without the base material after peeling The film peeling mechanism which has a conveyance roll B which conveys a sheet | seat, and the angle which the plane which contact | connects a conveyance turning roll and the conveyance roll A, and the plane which contact | connects a conveyance turning roll and the conveyance roll B is 28 degree or more. The method according to claim 7,
The conveyance roll C which conveys the double-sided adhesive sheet which does not have a base material in a conveyance turning roll further has a conveyance roll C, and the angle which the plane which contact | connects a conveyance deflection roll and the conveyance roll C and the plane which contact | connects the conveyance deflection roll and the conveyance roll B exceeds 0 degree | times. Film peeling mechanism. As an optical film manufacturing apparatus used for the manufacturing method of the optical film with an adhesive layer of Claim 6, The bonding mechanism which bonds an optical film to the adhesive layer surface of the double-sided adhesive sheet without a base material after peeling, and the film peeling mechanism of Claim 7 Optical film manufacturing apparatus which has.

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