JP2000289180A - Manufacture of flexographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve-like flexographic printing plate seamless at an image in a printing plate making process for directly lithographic forming a digitally computerized image by using an infrared laser. SOLUTION: The flexographic printing plate seamless by an ultraviolet ray is manufactured by circumferentially winding and laminating a non-self-adhesive ultraviolet shielding film removable by an infrared laser in a cylindrical state on an adhesive photosensitive resin layer having a uniform thickness provided seamlessly on a sleeve, removing only a superposed portion of the seamed film, and then removing the ultraviolet shield film by the laser to form an image, and then exposing with the ultraviolet ray and developing.

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 seamless flexographic printing plate using a plate making process for directly drawing an image which has become digital information using an infrared laser.

[0002]

2. Description of the Related Art A flexographic printing plate is a printing plate suitable for printing on an easily deformed printing material such as a cardboard or a soft packaging material, and usually has a structure in which a polyester film or the like is used as a support layer, and at least a It generally comprises a photosensitive resin layer containing one thermoplastic elastomer, at least one monomer and at least one initiator sensitive to radiation. On the photosensitive layer, a thin film often called a slip layer or a protective layer is provided for the purpose of smoothing the contact with the negative.

There is also known a technique for a flexographic printing plate photosensitive structure capable of directly drawing digitized image information without using a negative film, and a method for making the plate. The technique is to selectively cut off a thin layer of non-infrared rays provided on the non-infrared-sensitive photosensitive resin layer with an infrared laser based on digital information processed by a computer. Is obtained.

After drawing an image on the photosensitive resin layer, a conventional plate making process can be applied as it is. That is, using a conventional exposure apparatus, back exposure is performed from the support side, and relief exposure is performed from the image side drawn by the infrared laser, and then a flexographic printing plate is obtained through a development step.

[0005] Compared with the conventional method using a negative film, this plate making method does not require the creation of a new negative when an image is corrected, and is compatible with the computerized correction of digitized image data. This has the advantage of saving time and effort. It is also advantageous in dimensional stability as compared with conventional negatives, which leads to improved reproducibility of the relief image and, consequently, improved print quality.

[0006] On the other hand, in conventional flexographic printing, after plate making is performed in a plate shape, it is mounted on a plate cylinder or sleeve and used for printing. However, for applications such as wrapping paper and wallpaper, continuous designs may be required.In this case, not only special techniques are required to process the plate seams, but depending on the design, the seams of the plate are completely eliminated. Sometimes it is difficult to do so. In process printing, when a plate-shaped plate is mounted on a plate cylinder or a sleeve, a process of registering each color plate is required.

[0007] In order to save the above-mentioned steps, for example, in Japanese Patent Application Laid-Open No. Hei 10-73917, a seamless photosensitive resin layer is provided in the form of a sleeve, and is further provided thereon with a non-adhesive and insensitive to actinic radiation. There is proposed a method of providing a powder layer. However, this method requires a sufficient filtration of the spray liquid or the coating solution and a work environment in order to form the powder layer with good thickness accuracy even when using a sprayer or a ring coater and eliminating the influence of foreign matter. Since it is necessary to increase the degree of cleanliness, the productivity has been low and expensive equipment has to be introduced.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a flexographic printing plate manufacturing process corresponding to a plate making process for directly drawing an image converted into digital information using an infrared laser without using a negative film. On the seamless photosensitive resin layer provided, with good thickness accuracy,
Moreover, the present invention provides a method for producing a seamless flexographic printing plate by providing an ultraviolet shielding layer which can be cut off by infrared rays while eliminating the influence of foreign matter.

[0009]

SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problems. (1) The present invention relates to (1) a method in which a photosensitive resin layer having a uniform thickness and adhesiveness is provided seamlessly on a sleeve. Then, an ultraviolet shielding film which is non-self-adhesive and can be cut off by an infrared laser is wound in a cylindrical shape in the circumferential direction and laminated, and only the overlapping portion of the seam film is removed. (2)
This ultraviolet shielding film is cut off by an infrared laser to form an image, and (3) a method of producing a seamless flexographic printing plate through an exposure and a development process by ultraviolet rays.

The term "non-self-adhesiveness" as used in the present invention means a property that the ultraviolet light shielding films do not adhere to each other even when they come into contact with each other because they break or overlap, and can be easily separated. The tacky photosensitive resin layer used in the present invention is a thermoplastic elastomer obtained by polymerizing a conjugated diene with a monovinyl-substituted aromatic hydrocarbon as a binder polymer,
It is composed mainly of at least one ethylenically unsaturated monomer and a photoinitiator. Further, additives such as a sensitizer, a thermal polymerization inhibitor, a plasticizer, and a colorant can be contained according to the characteristics required for the photosensitive resin layer.

In a thermoplastic elastomer obtained by polymerizing a monovinyl-substituted aromatic hydrocarbon monomer and a conjugated diene monomer used as a binder polymer for a photosensitive resin layer, styrene, α-methyl Styrene, p-methylstyrene, p-methoxystyrene and the like are used, and conjugated diene monomers include butadiene and isoprene. Typical examples thereof include styrene-butadiene-styrene block copolymer and styrene-isoprene-styrene. And block copolymers.

The at least one ethylenically unsaturated monomer is compatible with the binder polymer. Examples thereof include esters of alcohols such as t-butyl alcohol and lauryl alcohol with acrylic acid and methacrylic acid, lauryl maleimide, and cyclohexyl maleimide. , Maleimide derivatives such as benzylmaleimide, or esters of fumaric acid with alcohols such as dioctyl fumarate, and many other compounds such as hexanediol di (meth) acrylate, nonanediol di (meth) acrylate, and trimethylolpropane tri (meth) acrylate. Esters of polyhydric alcohols with acrylic acid and methacrylic acid can be mentioned.

As the photoinitiator, aromatic ketones such as benzophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether,
It can be selected from known photopolymerization initiators such as benzoin ethers such as α-methylol benzoin methyl ether, α-methoxy benzoin methyl ether, and 2,2-diethoxyphenyl acetophenone, and can be used in combination.

The photosensitive resin layer can be prepared by various methods. For example, if the composition is as described above, the raw materials to be blended are dissolved in a suitable solvent, for example, a solvent such as chloroform, tetrachloroethylene, methyl ethyl ketone, and toluene, mixed and cast into a mold to remove the solvent. It can be evaporated to form a plate as it is. Further, the mixture can be kneaded by a kneader or a roll mill without using a solvent, and can be formed into a plate having a desired thickness by an extruder, an injection molding machine, a press or the like.

Many types of sleeves, which are made of polyester, polyamide, nickel, FRP, and the like, are commercially available as a sleeve serving as a support for the photosensitive resin layer, and any sleeve can be used. Further, a sleeve in which a foam layer or a rubber layer is provided over several layers on these basic materials may be used.

In order to provide a photosensitive resin layer seamlessly on the sleeve, a photosensitive resin formed in a plate shape in advance is wound around the sleeve via an adhesive layer, and this is heated to a temperature higher than the melting temperature of the photosensitive resin composition. There is a method in which a joint is eliminated by heating and then cooled, and the surface is polished with a gliding device so as to have a desired outer peripheral length. Alternatively, a method in which the molten resin is directly guided onto the sleeve, calendered into a cylindrical shape, cooled, and then the surface is polished is also effective.

The non-self-adhesive and ultraviolet-ray-absorptive ultraviolet shielding film of the present invention comprises a binder polymer, an infrared absorbing material and an ultraviolet shielding material. Examples of the binder polymer include styrene, α-methylstyrene, a copolymer of a monovinyl-substituted aromatic hydrocarbon such as vinyltoluene and a conjugated diene such as butadiene or isoprene, or a copolymer of a monovinyl-substituted aromatic hydrocarbon and a conjugated diene. Copolymers that have been hydrogenated, and further include polyamides and polyvinyl alcohols, but other polymers are non-self-adhesive when molded into an ultraviolet shielding film that can be cut off with an infrared laser. As long as it can be used.

750 to 2000 are usually used as infrared absorbing materials.
A simple substance or a compound having strong absorption in the range of nm is used. Examples of such materials include carbon black, graphite, copper chromite, inorganic pigments such as chromium oxide and polyphthalocyanine compounds, cyanine dyes,
Dyes such as metal thiolate dyes and the like can be mentioned. In particular, carbon black can be used in a wide range of particle sizes from 13 to 85 nm, and the smaller the particle size, the higher the sensitivity to infrared laser. These infrared absorbing substances are added within a range that provides sensitivity that can be cut off by the laser beam used. Generally, the addition of 10 to 80% by weight is effective.

As the ultraviolet shielding material, a material that reflects or absorbs ultraviolet light can be used. UV absorbers, carbon black, graphite and the like are good examples thereof, and the amount of addition is set so as to achieve the required optical density. In general, it is necessary to add so that the optical density becomes 2.0 or more, preferably 3.0 or more.

Next, a preparation method when carbon black is used as both the non-infrared absorbing substance and the ultraviolet shielding substance will be described. First, pellets obtained by previously kneading a binder polymer and carbon black using an extruder or a kneader are further formed directly into a thin film using an extruder and a biaxial stretching device. Alternatively, the pellets may be made into a solution using an appropriate solvent such as toluene, ethyl acetate, or alcohol, and coated on a cover sheet. As a method of dispersing the carbon black in the solution, a method of using both forced stirring by a stirring blade and stirring using ultrasonic waves is effective.

The cover sheet usually has a thickness of 20 to 200.
A polyester film or polypropylene film of μm or a laminate of these films is used, but the choice is limited as long as it temporarily supports the ultraviolet shielding film and then serves the purpose of transferring to the photosensitive resin layer. There is no. The thickness of the ultraviolet shielding film that can be cut off by the infrared laser should be determined in consideration of the sensitivity of the cutting by the infrared laser and the shielding effect of the ultraviolet light, and is usually 0.1 to 20 g / m ² , preferably 1 to ²⁰ g / m ² . It is set in the range of ５5 g / m ² .

As a method of providing an ultraviolet shielding film which can be cut off with an infrared laser on a seamless adhesive photosensitive resin layer on a sleeve, a non-self-adhesive thin ultraviolet ray wound in a roll shape in advance is used. While drawing out the shielding film, it is laminated while being wound on the photosensitive resin layer. At this time, it is preferable that the photosensitive resin layer and the ultraviolet shielding film are laminated while being pressed by a smooth rubber roll or the like so that air or the like does not enter between the photosensitive resin layer and the ultraviolet shielding film.

The ultraviolet shielding film goes around the photosensitive resin layer on the sleeve, and the portion where the seam overlaps is removed, so that the ultraviolet shielding film can be made seamless by removing only this portion. The part where the UV-shielding film and the photosensitive resin layer are in contact is tightly adhered due to the adhesiveness of the photosensitive resin layer, while the part where the UV-shielding film overlaps is due to its non-self-adhesiveness. The thin film is in a physically weak state without any support.
Therefore, by stretching with a force greater than the strength of the thin film, the film is torn at the seam boundary, and as a result, a seamless ultraviolet shielding film can be provided on the sleeve.

It is also effective to use a knife, a rolling cutter or the like to cut off the overlapped portion of the ultraviolet shielding film while leaving a small portion, and to remove the remaining portion by vacuum suction. Further, it is also effective to remove the overlapped portion by blowing it off with compressed air, or to remove the overlapped portion by rubbing with a soft brush that does not damage the surface of the film.

On the other hand, when the non-self-adhesive thin ultraviolet shielding film is pulled out and wound around the photosensitive resin layer and laminated, if the strength of the film is not sufficient, it is coated on a cover sheet in advance. An ultraviolet shielding film can be used. In this case, the ultraviolet shielding layer is laminated on the adhesive photosensitive resin layer provided on the sleeve together with the cover sheet, and then the cover sheet is peeled off to transfer the ultraviolet shielding layer onto the photosensitive resin layer. can do.

Alternatively, the ultraviolet shielding layer is laminated on the adhesive photosensitive resin layer provided on the sleeve together with the cover sheet, and the ultraviolet shielding layer is removed from the photosensitive resin layer by sequentially peeling off the cover sheet from the layered portion. It may be transferred onto a layer.

In order to cut off the overlapping portion of the seam of the laminated ultraviolet shielding layer, the ultraviolet shielding film is stretched to rupture the film from the boundary of the joint, thereby providing a seamless ultraviolet shielding film. In this case as well, use a knife or a rolling cutter to cut off the overlapped portion of the ultraviolet shielding film, leaving a small portion, and remove the remaining portion by vacuum suction or blowing it off with compressed air. A method of rubbing with a soft brush that does not damage the surface is also effective.

Next, the sleeve having an ultraviolet shielding film which can be cut off by a seamless infrared laser obtained in this manner is mounted on an infrared laser drawing apparatus, and the ultraviolet shielding film is selectively removed to thereby obtain a photosensitive film. Negative is produced directly on the conductive resin layer.

As the infrared laser used here, one having a wavelength of 750 to 2000 nm can be used. 750-880 as this type of infrared laser
A semiconductor laser of 10 nm and a Nd-YAG laser of 1060 nm are generally used. These laser generation units are controlled by a computer together with the drive system unit. By selectively cutting off the ultraviolet shielding film on the photosensitive resin layer, digitized image information is placed on the photosensitive resin layer. Is to be granted.

After the image drawing by the laser is completed, the ultraviolet light source used for photo-curing the photosensitive resin layer on the sleeve includes a high-pressure mercury lamp, an ultraviolet fluorescent lamp, a carbon arc lamp, a xenon lamp, and sunlight. is there. A desired relief image can be obtained by exposing the image surface with ultraviolet rays.

After an image is formed by irradiating the photosensitive resin layer with ultraviolet rays, a developing solvent used to wash out the unexposed portions of the ultraviolet shielding film and the photosensitive resin layer includes an ultraviolet shielding film and a photosensitive resin. It is preferable that they have the property of dissolving both layers, but in some cases, the solvent that dissolves them may be different. Usually heptyl acetate,
Mix esters with esters such as 3-methoxybutyl acetate, petroleum fractions, hydrocarbons such as toluene and decalin, chlorinated solvents such as tetrachloroethylene, and alcohols such as propanol, butanol and pentanol with these solvents. It is common to use one that has been done.

Washing out of the ultraviolet shielding film and the unexposed portion is performed by spraying from a nozzle or by brushing with a brush. The obtained printing plate is rinse-washed, dried and post-exposed to finish.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples.

[0034]

EXAMPLES Example 1 (a) Step of providing a seamless photosensitive resin layer having a uniform thickness on a sleeve An adhesive Megam 11658 (trade name, manufactured by Kemetal Company) is applied to the outer surface of a nickel sleeve having an outer circumference of 461.15 mm and a length of 1250 mm. (Germany) was spray-coated uniformly at a wet coating amount of 120 g / m ² and dried at 60 ° C. for 15 minutes.
This was covered with TGI stockings (trade name, manufactured by Anderson and Vlieland) while stretching so that the fibers did not overlap.

AFP / AFP for flexographic printing
HD-11 (trade name, manufactured by Asahi Kasei Corporation, plate thickness 3.18 m)
m, a short side of size 762 mm × 1016 mm) was cut to have a size of 465.15 mm × 1016 mm.
After the film on the opposite side of the sheet with the slip layer was peeled off, the above-mentioned sleeve was wound around the above-mentioned sleeve with the side from which the film had been removed facing down to 465.15 mm in the circumferential direction without loosening. However, the length of the sheet was slightly shorter than the circumference of the sleeve. After the gap was connected by pulling with an adhesive tape, the area from 5 cm at both ends of the photosensitive resin sheet to the outside of the sleeve was covered with the adhesive tape without any gap.

By vacuuming the space between the pressure-sensitive adhesive tape covering both ends of the sleeve and the sleeve, the photosensitive resin sheet is brought into close contact with the sleeve, and the P on the surface of the photosensitive resin sheet is
After the ET film (cover sheet) was cut along the circumference with a cutter knife just inside the adhesive tape wound around both ends of the photosensitive resin sheet, the PET film and the slip layer on the cut inside were peeled off. Further, when the entire sleeve was heated at 130 ° C. for 20 minutes while the space between the adhesive tape and the sleeve at both ends of the photosensitive resin sheet was evacuated, seams of the photosensitive resin sheet became invisible.

The thus obtained seamless photosensitive resin sleeve is transferred to a grinding machine SA6 / 2U × 2.
00 (manufactured by Schleif-Maschinenwerk, Germany) and polished until the outer periphery of the photosensitive resin became 480 mm. The surface of the obtained photosensitive resin was rough and white and cloudy in appearance.

Next, while vacuuming the space between the photosensitive resin layer and the sleeve of the photosensitive resin sleeve,
After heat treatment at 0 ° C. for 30 minutes, the roughness of the photosensitive resin surface disappeared, and a transparent impression was obtained.

(B) Step of Preparing Ultraviolet Shielding Layer Cuttable by Infrared Laser 65 parts of Asaflex 815 (manufactured by Asahi Kasei Kogyo Co., Ltd.) and general-purpose color black # 30 which is carbon black having a particle diameter of 30 nm (Mitsubishi Chemical Corporation) Was mixed in a mixed solvent of toluene / celloacetate = 8/2 to prepare a uniform 8% by weight solution.
Next, this solution was continuously coated on a polypropylene film having a thickness of 22 μm and a width of 1050 mm as a cover sheet using a bar coater so that the coating amount after drying was 1016 mm and the coating amount after drying was 3 to 4 g / m ^2. It was coated and dried to prepare an ultraviolet shielding film that can be cut off by infrared rays, and this was wound into a roll. This ultraviolet shielding film had no self-adhesiveness, and its optical density was measured to be about 3.2.

(C) A step of laminating an ultraviolet shielding film that can be cut off with an infrared laser on a photosensitive resin Roll of a cover sheet in which the ultraviolet shielding layer produced in (b) is applied to the sleeve produced in (a) Are placed in parallel, the roll is pulled out, the coating width and the width of the sleeve (both are 1016 mm) are adjusted, and then the edge of the cover sheet is attached to the photosensitive resin layer so that the coating surface is in contact with the photosensitive resin layer. Was used for temporary attachment.

Next, while holding the cover sheet temporarily attached with a smooth rubber roll, the sleeve is rotated and the cover sheet is wound around the sleeve to be laminated.
The cover sheet was cut with a rolling cutter leaving an extra cm. Thereafter, the cover sheet was peeled off, and the ultraviolet shielding layer was transferred onto the photosensitive resin layer.
When an extra cm was pulled by hand, the ultraviolet shielding film could be removed almost along the boundary of the joint, but a portion slightly protruding from the seam remained. This part was carefully rubbed off with a household toothbrush to provide a seamless UV shielding film on the sleeve.

(D) Step of making a seamless flexographic plate A sleeve having a seamless ultraviolet shielding film prepared in (c) is attached to an infrared laser writing device, and a 10 MW
Using an Nd-YAG laser having an energy density of / cm ² , the ultraviolet shielding film is selectively cut off under the condition that the rotation speed of the sleeve is 1600 rotations per minute, and line / space = 300 μ / along the rotation direction of the sleeve. A 300μ image was produced.

After drawing the sleeve, insert the Minislee
v System (trade name, manufactured by Anderson & Vlieland Co.) exposure machine, using an ultraviolet fluorescent lamp having a center wavelength of 370 nm, 6000 mJ /
A cm ² relief exposure was performed. The amount of exposure at this time was measured using a UV illuminometer MO-2 model manufactured by Oak Manufacturing Co., Ltd.
The calculation was based on the illuminance measured using five filters. Subsequently, a sleeve was attached to the developing machine of the same system, and an ultraviolet shielding film was formed with a brush using a mixed solvent of Solvesso 150 (trade name, manufactured by Exxon Chemical Company, aromatic hydrocarbon) / benzyl alcohol = 4: 1 (volume). Wash off,
And washing out the unexposed part of the photosensitive resin layer,
After drying for 1 hour, line / space = 300μ
The / 300μ image was formed continuously along the circumference of the sleeve, and a seamless flexographic printing plate was obtained.

Example 2 A sleeve having a seamless photosensitive resin layer manufactured in the same procedure as in (a) of Example 1 was used.
The rolls of the cover sheet coated with the ultraviolet shielding film that can be cut off by infrared rays, which were prepared in the same procedure as in (b), were placed side by side, and the rolls were pulled out to adjust the coating width and the width of the sleeve (both 1016 mm). Then, an end portion of the cover sheet was temporarily attached using the adhesiveness of the photosensitive resin layer so that the application surface was in contact with the photosensitive resin layer. Next, while holding the cover sheet temporarily attached with a smooth rubber roll, rotate the sleeve and wind the cover sheet around the sleeve, stacking it, peeling off the cover sheet sequentially from the part where stacking was completed, and exposing it to light. The ultraviolet shielding layer was transferred onto the conductive resin layer.

When the sleeve had completed one round, the cover sheet was cut with a rolling cutter leaving about 3 cm extra from the joint. Next, the compressed air of about 2 kg / cm ² is blown with an air gun to the ultraviolet shielding film, which is about 3 cm extra from the seam, which has lost the support after the cover sheet is peeled off, and the excess is blown off to remove. A seamless UV shielding film was provided on the sleeve. Subsequently, the sleeve was made in the same procedure as in Example 1 (d) to obtain a seamless flexo.

Example 3 An ultraviolet shielding layer was provided on the sleeve in the same manner as in Example 2, and an extra portion of about 3 cm from the seam was removed by vacuum suction to provide a seamless ultraviolet shielding film. This was subjected to plate making in the same manner as in Example 1 to obtain a seamless flexographic printing plate.

Comparative Example 1 35 parts of Asaflex 815 (manufactured by Asahi Kasei Corporation), B-2
000 (liquid polybutadiene, manufactured by Nisseki Chemical Co., Ltd.) 30 parts,
35 parts of a general-purpose color black # 30 (manufactured by Mitsubishi Chemical Corporation), which is a carbon black having a particle diameter of 30 nm, was kneaded with a kneader and dissolved in a mixed solvent of toluene / cellosolve acetate = 8/2 to obtain a uniform 8% by weight. A solution was prepared. Next, this solution was applied onto a polypropylene film having a thickness of 22 μm and a width of 1050 mm serving as a cover sheet, with a coating width of 1 μm.
Using a bar coater, apply and dry continuously to prepare an ultraviolet shielding film that can be cut off by infrared rays so that the coating amount after drying at 016 mm is 3 to 4 g / m ^2, and this is wound into a roll. Was. The optical density of this ultraviolet shielding film is about 3.0.
However, self-adhesion was observed.

This ultraviolet shielding film was laminated on the sleeve in the same manner as in Example 1, but an extra 3 cm from the seam boundary adhered to the already laminated ultraviolet shielding layer, and compressed air or vacuum was applied. It could not be removed using suction. The sleeve was made in the same manner as in Example 1, but the portion where the ultraviolet shielding film overlapped and adhered was not removed by infrared laser drawing, and a flexographic plate having a desired image could not be obtained.

[0049]

According to the plate making process of directly drawing an image converted into digital information by using an infrared laser without using a negative film, a sleeve having a simple and seamless image can be obtained while minimizing the influence of dust and foreign matter. It is now possible to provide a flexographic version.

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Claims (6)

[Claims] (1) A non-self-adhesive and ultraviolet-ray-removable ultraviolet shielding on a photosensitive resin layer having a uniform thickness and adhesiveness provided seamlessly on a sleeve. After the film is wound in a cylindrical shape in the circumferential direction and laminated, and only the overlapping portion of the seam film is removed, (2) the ultraviolet shielding film is cut off with an infrared laser to form an image,
(3) A method of producing a seamless flexographic printing plate through an exposure and a development process with ultraviolet rays. 2. An ultraviolet shielding film which is non-self-adhesive and can be cut off by an infrared laser is previously formed as a coating film on a cover sheet, and is laminated while being wound on a photosensitive resin layer together with the cover sheet. The method according to claim 1, wherein the cover sheet is peeled off and the ultraviolet shielding layer is transferred. 3. The method according to claim 1, wherein an ultraviolet shielding film, which is non-self-adhesive and can be cut off by an infrared laser, is laminated on the photosensitive resin layer, and then the overlapping portion of the film is stretched and removed. The described method. 4. After laminating an ultraviolet shielding film which is non-self-adhesive and can be cut off by an infrared laser on the photosensitive resin layer, an overlapping portion of the film is removed by suction.
The method described in. 5. An ultraviolet shielding film which is non-self-adhesive and can be cut off by an infrared laser is laminated on the photosensitive resin layer, and then the overlapping portion of the film is blown off with compressed air to remove it. The method described in. 6. After laminating an ultraviolet shielding film which is non-self-adhesive and can be cut off with an infrared laser on the photosensitive resin layer, the overlapping portion of the film is rubbed off with a brush.
Or the method of 2.