JP2001105392A - Method of manufacturing for adhesive film sheet article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently punching out and manufacturing a surface highly-hardened adhesive film sheet article for a display screen with high quality. SOLUTION: This manufacturing method for an adhesive film sheet article punches out the surface highly-hardened adhesive film including a plastic film having both one highly-hardened surface of a pencil hardness above 2H and the other surface provided with an adhesive layer and a release film layer, from the release film layer side in prescribed size and shape by use of a center edge having an edge angle of 25-35 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a single-piece adhesive film, and more particularly, to a method for producing a single-piece adhesive film having a surface for a display screen having a high hardness.

[0002]

2. Description of the Related Art Conventionally, in order to impart antireflection performance to a display screen (CRT) of a television or a computer or other display screens, a method of multi-layer coating a metal oxide on a display screen surface such as glass is known. However, in the case of a three-dimensional screen such as a CRT, a vapor deposition device or a coating device becomes enormous, and productivity is poor.

As a method for solving this problem, an anti-reflection layer is formed on a plastic film having a hardened surface, and an adhesive layer is provided on the back surface of the anti-reflection film, and a release film is provided thereon. There has been proposed a method of attaching a prevention film to a display screen. This antireflection film has been difficult to stick with a conventional curved cathode ray tube, but with the spread of flat cathode ray tubes, it has become commonplace to stick a surface hardening antireflection film to the surface of a display glass.

[0004] The anti-reflection film having a high surface hardness,
Continuously processed products are cut into pieces according to the size and shape of the screen of the display body to be pasted, and used in sheet form. In general, as a method of forming a single sheet, in many cases, a sheet which has been slit into a predetermined width in accordance with the dimensions of the final product and wound up is cut to a predetermined length by a shear-cut method while being fed. However, in this method,
It is inevitable that the appearance quality such as dents of the adhesive layer is reduced due to the intrusion of foreign matter when the film is wound. Further, when cutting off the corners of the cut, an extra step is required. However, if this is cut slightly larger than the final product after the adhesive processing, and punched out using a press cutter, only one process is required.

Further, when the corners are round, or when there are irregularities or curved portions other than a square shape, the above-mentioned conventional method is impossible and punching by press cutting is indispensable.

There are two methods of punching out a surface-hardened film having a pressure-sensitive adhesive layer on the back surface by stamping, a method of punching from the hardened surface side and a method of punching from the release film side. When using a normally used blade with a blade angle of 40 degrees to 60 degrees and punching from the hardened surface side,
Since the hardened layer is broken and scattered, cleaning after punching becomes indispensable. In addition, crack sticks enter between the adhesive and the display screen when pasted on the display screen, resulting in foreign matter defects, and the yield is greatly reduced.

Conversely, when the surface-hardened pressure-sensitive adhesive film is punched from the release film side using a blade having a cutting edge angle of 40 ° to 60 ° usually used for punching, cracks in the hardened layer are reduced. However, there is a problem that the amount of the sticking out of the pressure-sensitive adhesive increases, which affects the surface contamination, and that the product arrives at the blade and cannot be discharged from the blade mold.

[0008]

The laminated film to be attached to the display screen of a television or a computer for the purpose of preventing reflection and improving the contrast includes a plastic film having a pencil hardness of 2H or more on the surface. A sheet-shaped product obtained by punching a surface-hardened pressure-sensitive adhesive film having a pressure-sensitive adhesive layer on the other surface and a release film bonded thereto into a predetermined size and shape is used. There was no punching method that satisfied both quality, productivity and productivity.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide a method of punching and manufacturing a high-quality, highly-hardened pressure-sensitive adhesive film for a display screen efficiently and efficiently. is there.

[0010]

As a result of intensive studies by the present inventors, the above-mentioned object has been attained by the following invention, which can be industrially implemented.

[0011] The method for producing a single-piece adhesive film product of the present invention is characterized in that a surface-hardened adhesive layer comprising a pressure-sensitive adhesive layer and a release film layer provided on the other surface of a plastic film having a pencil hardness of 2H or more. When the film has a blade angle of 25
A method for producing a pressure-sensitive adhesive sheet-fed product, comprising punching a predetermined size and shape from the release film side using a blade having an angle of 35 degrees to 35 degrees.

The method for producing a single-piece adhesive film product according to the present invention is characterized in that the surface of the plastic film having a pencil hardness of 2H or more is provided with an adhesive layer and a release film layer on the other surface. After continuous processing of the long-lasting adhesive film, it is cut into a predetermined size and the thickness of the blade is 0.5 mm
Using a center blade having a cutting edge of 1.5 to 1.5 mm and a cutting edge angle of 25 to 35 degrees from the release film side to a predetermined size and shape. The long surface-hardened pressure-sensitive adhesive film is preferably cut into sheets each having a size larger than an integral multiple of the final product size.

[0013] The method for producing a pressure-sensitive adhesive film sheet product of the present invention is characterized in that the surface of the plastic film having a pencil hardness of 2H or more is provided with an adhesive layer and a release film layer on the other surface. The adhesive film is continuously processed in a long length, and a slip paper tape is put into both ends and wound up. While feeding the same, the thickness of the blade is 0.5 mm to 1.5 mm and the angle of the blade edge is 25 to 35 degrees. Using a certain center blade,
This is a method for producing a piece of pressure-sensitive adhesive film, characterized by punching out a predetermined size and shape from the release film side with the hardened surface down.

Further, in the present invention, it is preferable that an antireflection layer made of a metal oxide, a metal nitride, or the like is provided on the surface of the plastic film having a high hardness.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the method for producing a pressure-sensitive adhesive film sheet product of the present invention, the most typical example is that a surface-hardened film having a rear surface subjected to pressure-sensitive adhesive treatment is formed after the pressure-sensitive adhesive treatment and before winding. It is cut slightly larger, and it is peeled off with a center hardened blade with a blade thickness of 0.5 mm to 1.5 mm and a blade angle of 25 to 35 degrees with the surface hardened down. Punched from the film side or rolled with insert paper tape at both ends, using a center blade with a blade thickness of 0.5 to 1.5 mm and a blade angle of 25 to 35 degrees It is characterized in that punching is performed from the release film side with the hardened surface facing down.

In the present invention, the surface-hardened pressure-sensitive adhesive film is defined as a plastic film having one surface hardened to a pencil hardness of 2H or more, a pressure-sensitive adhesive layer provided on the other surface, and a release film bonded thereto. And a plastic film having good transparency and a thickness of preferably about 50 to 250 μm, more preferably 100 to 188 μm, polyester, triacetate,
Examples include films made of polycarbonate.

In order to increase the surface hardness of the plastic film, a layer formed by applying a hard coat agent such as a silicone resin or an ultraviolet curing acrylic resin to form a surface hardness layer is preferably used. In addition, if necessary, a material which has been subjected to an easy adhesion treatment in order to increase the adhesion to the plastic film as the base material may be used. In the present invention, an antireflection layer can be provided thereon depending on the application. The antireflection layer can be formed by vapor deposition, sputtering, or coating of a metal oxide, a metal nitride, or the like.

The pressure-sensitive adhesive layer in the present invention is a layer obtained by applying a commonly used pressure-sensitive adhesive according to a conventional method, as long as the display glass and the plastic film as the substrate can be stably adhered for a long period of time. It is also possible to use a pressure-sensitive adhesive to which a coloring agent is added as necessary for improving the contrast. Further, an antistatic agent or an ultraviolet absorber may be added. Examples of the adhesive include an acrylic one liquid, an acrylic two liquid, a rubber-based, a urethane-based, and a silicone-based adhesive, and the acrylic two-liquid is particularly preferably used.

In the present invention, when winding the surface-hardened pressure-sensitive adhesive film, inserting an interleaf tape at both ends, or cutting the film slightly larger than the final product size by in-line cutting before winding, is due to the presence of foreign matter. This is to avoid deterioration of the appearance quality such as dents of the pressure-sensitive adhesive due to entanglement.

When the punching surface of the surface-hardened pressure-sensitive adhesive film is punched with the release film facing down, that is, with the hardened surface facing up, the edge portion can be hardened regardless of the angle of the blade edge. Cracks are formed in the layer, and a large number of chips (chips) that fall off due to cracking of the surface-hardened layer are generated. In order to remove this, even if the surface is carefully wiped off with a soft cloth so as not to damage the surface, the surface itself is damaged because the cutting powder itself is hard. In addition, the method of cleaning with a slightly adhesive roll also requires frequent replacement of the adhesive surface layer of the roll because of the large amount of chips attached. In addition, even if the chips were removed cleanly, even if the chips were hardened at the edges, they fell off during the movement due to cracks in the hardened layer, and when they arrived at the customer, the chips were generated. May occur earlier.

When a punching surface is covered with a cover film and punched out from the hardened surface, chips are generated, but are not scattered because they are covered and do not reach the hardened surface. Are generated in the same manner, so that swarf is generated after the movement and enters the adhesive surface when pasting to the CRT, resulting in poor appearance.

Conversely, as in the present invention, when the punching surface is punched out from the release film side with the hardened surface facing down, the generation of chips is almost eliminated, but if the angle of the blade edge is too large, The adhesive sticks out from the end much, so that the product surface is soiled or the product comes to the cutting edge and the product cannot be discharged from the blade mold in a few shots. When punching from the release film side using a blade with a blade angle of 25 to 35 degrees, there is almost no generation of chips, the adhesive does not protrude, and continuous punching without problems of discharge failure Can be. If the angle of the cutting edge is smaller than the above range, the strength of the cutting edge is reduced, the durability is remarkably deteriorated, and the cutting edge is not practical, and it is difficult to polish the cutting edge, and it is difficult to form the cutter itself.

The use of a cutter whose edge is treated with a release agent such as a fluorine-based, silicon-based, or long-chain aliphatic-based agent reduces the amount of the sticking-out adhesive.

In the present invention, a center blade is preferably used. Actually, a single-edged blade is often polished from the opposite side to only about 50 degrees at the very tip in order to give the blade edge strength, and the conventional center blade with a blade angle of 40 degrees to 60 degrees. There is a similar tendency. Furthermore, when the product is punched and the blade comes off, the inside of the blade mold is in a reduced pressure state, and the product is hard to come off. In addition, the load applied to the machine at that time also increases.

The thickness of the blade used in the present invention is 0.5 m
m to 1.5 mm is preferred. If it is thinner than 0.5 mm, it will be easily broken when bent, and if it is thicker than 1.5 mm, bendability will be poor.

The receiving sheet specified at the time of punching is preferably a sheet having both rigidity and toughness, such as a polyester film and a polycarbonate sheet, but is not particularly limited thereto.

In the present invention, after the surface-hardened pressure-sensitive adhesive film has been continuously processed in a long length, it has a predetermined size before winding.
Preferably, the sheet is cut into a sheet slightly larger than an integral multiple of the final product size, and, as described above, is punched out from the release film side to a predetermined size and shape, thereby providing an industrially advantageous adhesive film sheet. Leaf products can be manufactured.

Further, the pressure-sensitive adhesive film having a high surface hardness is continuously processed into a long length, and a slip paper tape is inserted at both ends and wound up. By punching into a shape and a shape, a pressure-sensitive adhesive film sheet can be produced industrially advantageously.

[0029]

The present invention will be described below with reference to examples. In addition, pencil hardness is measured as follows.

[Measurement method for pencil hardness] JIS K5400
Using Haydon manufactured by Japan High-Tech Co., Ltd., and using a pencil for a pencil scratch value test of the Japan Paint Inspection Association, evaluation was made based on the presence or absence of scratches when scratched with a weight of 1 kg. It was represented by the hardness of the pencil when no more than 3 out of 5 scratches. [Example 1] On one surface of a 188 µm polyester film, an ultraviolet curable acrylic paint was applied using a die coater and dried using a die coater so that the applied amount after drying was 15 µm, to prepare a polyester film having a high surface hardness. The pencil hardness of the obtained surface-hardened layer was 4H.

On the surface hardened layer, ITO, Si
An antireflection layer having a four-layer structure of O ₂ , ITO, and SiO ₂ is formed by EB evaporation (a vacuum evaporation method in which an evaporation material is directly heated by an electron gun) so that each layer has the following optical thickness (nxd). And a water-repellent layer made of (heptadecafluoro-1,1,2,2-tetradodecyl) -1-trimethoxysilane was formed on the antireflection film.

[0032] On the other hand, a two-component acrylic adhesive was applied to a release film obtained by coating a silicone film on a 75 μm polyester film using a comma coater so that the thickness after drying would be 30 μm, and then dried. The back surface of the film was bonded to the surface with a high hardness film.

The obtained surface-hardened film was cut into 725 mm × 590 mm before winding. Using a crank-type punching machine, a 280 mm x 350 mm single sheet product with a surface hardened layer facing down from the release film side with a center blade with a blade thickness of 0.7 mm and a blade angle of 26 degrees is used. I punched four sheets.

The obtained product was good with little edge cracks and chips, no sticking out of the pressure-sensitive adhesive, and no appearance defect when affixed to a cathode ray tube. Table 1 shows the results. Example 2 and Comparative Examples 1 and 2 In Example 1, the cutting edge angle was 30 degrees (Example 2),
Except for 3 degrees (Comparative Example 1) and 53 degrees (Comparative Example 2),
Performed in the same manner as in Example 1. As shown in Table 1, in Example 2, the edge cracks, chips,
The adhesive was good without sticking out, but in Comparative Examples 1 and 2, the sticking out of the adhesive was large and the product could not be discharged in a few shots.

[Comparative Examples 3 to 5]
Cutting edge angle 26 degrees (Comparative Example 3), 30 degrees (Comparative Example 4), 4
Using 3 times (Comparative Example 5), punching was performed with the surface hardened layer facing upward. In each of the punched sheet products, cracks at the edges were remarkable, and a large amount of chips was generated. After the generated chips were removed with a cleaning roll or the like, the chips were attached to a cathode ray tube, but the defective rate due to the chips being involved was 6%. Table 1 shows the results.

Example 3 On one side of a 100 μm polyester film, an ultraviolet-curing acrylic paint was applied by a roll coater and dried so that the applied amount after drying was 5 μm, to prepare a film having a hardened surface. . The surface hardness of the resulting surface-hardened film was 2H in pencil hardness.
An anti-reflection film having a higher surface hardness, on which a tin-based and fluorine-based anti-reflection coating was further formed on the surface-hardened layer, was prepared.

On the other hand, a two-component acrylic adhesive was applied to a release film obtained by coating a silicone film on a 75 μm polyester film using a comma coater and dried so as to have a thickness of 30 μm after drying. Laminated with the back of anti-reflection film, 12μm thick at both ends
Was wound up and wound up.

While feeding this, a 280 mm × 350 mm sheet from the peeling film side with the surface hardened side down by a center blade having a blade thickness of 0.7 mm and a blade angle of 26 ° using a crank type punching machine while feeding. Leaf products were continuously punched.

The obtained single-wafer product did not have edge cracks, chips, and sticking out of the adhesive, and had no defective appearance when affixed to a cathode ray tube. Table 1 shows the results.

Comparative Example 6 The procedure of Example 3 was repeated, except that the release film was adhered and bonded to an antireflection film having a hardened surface, followed by winding without inserting an interleaf tape at both ends. A single-wafer product was obtained in the same manner as in Example 3. The obtained single-wafer product did not have edge cracks, chips, and sticking out of the adhesive, but had many dents in the adhesive and became a defect in appearance even after pasting on a cathode ray tube. Table 1 shows the results.

[0041]

[Table 1]

[0042]

According to the present invention, it is possible to efficiently produce a high quality surface-sensitive adhesive film sheet material for a display screen with high quality. Furthermore, the yield can be improved by suppressing the occurrence of defects when the sheet material having the higher surface hardness is adhered to the display screen.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C060 AA04 AB01 BA03 BB19 BG18 BH01 4J004 AA05 AA10 AA11 AA14 AB01 CA02 CA06 CC05 CC08 CD06 CD07 CD08 CE03 DB02 EA01 EA04 FA10 GA01

Claims (5)

[Claims] 1. A surface-hardened pressure-sensitive adhesive film in which a pressure-sensitive adhesive layer and a release film layer are provided on the other surface of a plastic film whose surface is hardened to a pencil hardness of 2H or more, has a blade angle of 25 to 35 degrees. A method for producing a pressure-sensitive adhesive film sheet material, comprising punching a predetermined size and shape from the release film side using a blade having a predetermined degree. 2. After continuously processing a long-strength pressure-sensitive adhesive film having a pressure-sensitive adhesive layer and a release film layer provided on the other surface of a plastic film whose surface is hardened to a pencil hardness of 2H or more, And the blade thickness is 0.
5mm to 1.5mm, the angle of the cutting edge is 25 degrees to 35
A method for producing a single-piece PSA film, comprising punching a predetermined size and shape from the release film side using a center blade. 3. The method according to claim 2, wherein the sheet is cut into sheets larger than an integral multiple of the final product size. 4. A long and continuous surface-hardened pressure-sensitive adhesive film comprising a pressure-sensitive adhesive layer and a release film layer provided on the other surface of a plastic film whose surface is hardened to a pencil hardness of 2H or more, Insert and insert a paper tape, and while feeding it, the thickness of the blade is 0.5 mm to 1.5 mm
Then, using a center blade having a blade edge angle of 25 to 35 degrees, punching a predetermined size and shape from the release film side with the hardened surface down. A method of manufacturing a sheet-fed product. 5. The method according to claim 1, wherein an antireflection layer is provided on the surface of the plastic film having a high hardness.