JP2006198844A - Jointless relief printing sleeve constituting element made of resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jointless relief printing sleeve constituting element made of a resin which allows a used relief printing functional layer made of a resin to be easily removed from the surface of a support sleeve without adversely affecting the quality of a formed pattern and the layer to be formed anew on the sleeve, in the relief printing sleeve constituting element made of a resin to be used for the formation of a pattern, e. g. by design printing and embossing. <P>SOLUTION: This jointless relief printing sleeve constituting element made of a resin has a synthetic resin layer formed releasably and substantially without a joint on the surface of the support sleeve, and further, a laminated resin layer which can be made into a printing plate by exposing it to chemical rays. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides letterpress printing, such as design printing on wallpaper, packaging materials, liquid containers, gift boxes, etc., embossing on decorative materials such as decorative plates and beverage cans, aluminum cans, and mask formation when printing on electronic boards. The present invention relates to a seamless resin relief sleeve structure used for pattern formation on a workpiece surface performed by a method.

As a printing plate in the relief printing method, a resin relief plate having rubber elasticity in a room temperature region such as rubber and a thermoplastic elastomer is generally used, and many are used for flexographic relief printing characterized by its flexibility. For this reason, it is possible to form a pattern with light pressure on the surface of the workpiece compared to a planographic intaglio plate using a metal substrate used in offset printing or gravure printing, and the surface roughness like corrugated cardboard is high and the rigidity is low. It is suitably used for pattern formation on materials and thin film materials such as polyester, polypropylene, and polyethylene that are easily stretched by tension.
Resin letterpress used for flexographic letterpress printing is generally made of a sheet-like photosensitive thermoplastic elastomer, which is irradiated with actinic radiation such as ultraviolet rays through a desired negative film. The photo-cured photosensitive resin is developed to produce a relief plate having a convex relief. Recently, CTP plate making technology that directly imparts negative film characteristics to the resin surface in these plate making processes simplifies the plate making process and provides high-precision reproduction of convex reliefs, resulting in shorter delivery times and higher quality applications. You can also use it.

  On the other hand, when mounting a resin relief plate on a printing machine, it is necessary to determine the position of the sheet-like resin relief plate on the cylinder of the printing press with a double-sided adhesive tape, etc. and attach it with high precision. There is a problem that pasting work is required. Therefore, recently, a resin relief printing sheet is fixed to a hollow cylindrical support sleeve removable from the cylinder in advance with a double-sided adhesive tape or the like, and items are exchanged together with the support sleeve in and out of the printing press cylinder. The method is taken. In JP-A-8-305030 (Patent Document 1), a photosensitive resin CTP plate sheet provided with an infrared-sensitive layer excellent in non-infrared shielding property on its surface is pasted on a support sleeve with a double-sided adhesive tape or the like. A photosensitive resin that is photocured by selectively ablating an infrared sensitive layer in a desired pattern with an infrared laser to form a negative mask on the surface, and irradiating with actinic radiation such as ultraviolet rays through the negative mask A method has been proposed in which positioning on the printing press is performed in advance in the plate making process by developing the toner, and at the same time, a convex relief having a high-definition pattern, which is a feature of the CTP plate, is obtained on the sleeve.

  With the invention of such a technique, pattern formation by the flexographic relief printing method is reviewed as a method with higher production efficiency. However, the resin relief plates used in this way are all sheet-like, and can not form a continuous pattern in the circumferential direction without gaps due to the gaps in the plate edges that occur in the circumferential direction of the printing press cylinder, When such a continuous pattern is required, after laminating a sheet-like resin relief plate to a printing machine cylinder or a support sleeve, a liquid photosensitive resin or the like is poured between circumferential plate ends. Post-processing such as processing was necessary. In addition, even after such post-processing, complicated continuous patterns and high-precision / high-definition continuous patterns could not be completely handled.

  Recently, the demand for a continuous pattern has increased due to the superiority of the above-described flexographic relief printing method, and a method for producing a resin relief sleeve that is seamless in the circumferential direction has been proposed. For example, as disclosed in Japanese Patent Application Laid-Open No. 2003-025749 (Patent Document 2), the sheet end portion around which the sheet-like photosensitive material is wound around the support sleeve is heated to the softening point or higher to be fused. After grinding and forming seamlessly with a grinder, etc., an infrared sensitive layer with excellent non-infrared shielding properties is applied to the outer peripheral surface seamlessly in the circumferential direction, and the infrared sensitive layer is selectively formed into a desired pattern by an infrared laser. A negative-type mask is formed on the surface of the cut-out surface, and a convex relief is obtained by developing a photosensitive resin photocured by irradiating with actinic rays such as ultraviolet rays through the negative-type mask. As disclosed in 2004-262076 (Patent Document 3), a liquid or hot-melt photosensitive thermoplastic elastomer is applied to a support sleeve, and ultraviolet rays or the like are applied. The photosensitive resin is photocured by irradiation with academia and molded seamlessly by a grinding machine or calendering process, and the photocured photosensitive resin is engraved and projected while irradiating an infrared laser controlled to a desired pattern. A mold relief is obtained.

  Resin letterpress sleeves obtained by these methods are seamless in the circumferential direction and have high-precision, high-definition convex reliefs, such as design printing on wallpaper, packaging materials, liquid containers, gift boxes, decorative boards, etc. It plays a major role in the development of applications for flexographic relief printing, such as embossing of building materials and mask formation during electronic board printing. However, the resin-made relief printing sleeves produced by these methods are used after the use in order to fix the photosensitive material that becomes the resin relief printing directly to the support sleeve or via an adhesive. It was difficult to remove the relief printing plate from the support sleeve, and the expensive support sleeve could not be reused.

As disclosed in Japanese Patent Application Laid-Open No. 2000-267264 (Patent Document 4), a support sheet, such as a film, is wound around the support sleeve surface, and a joint is fixed with an adhesive tape or the like. A method of protecting and recycling the support sleeve after use by laminating a resin relief plate as described above has also been proposed. However, the support can be peeled off to a wide support sleeve or a non-rigid support sleeve. It is difficult to wind the body sheet uniformly, and there is a problem that a minute height difference due to the joint of the support sheet formed in the circumferential direction or the adhesive sheet affects the formation of a high-definition pattern.
JP-A-8-305030 JP 2003-025749 A JP 2004-262076 A JP 2000-267264 A

  The present invention relates to a seamless resin relief printing sleeve structure constituted by using a support sleeve, and can easily remove the used resin relief printing plate from the support sleeve without affecting the pattern formation. It is an object of the present invention to provide a seamless resin relief sleeve structure capable of regenerating the relief printing on the support sleeve.

  The present inventors have provided a release layer made of a synthetic resin that is substantially seamless on the support sleeve, and laminated a resin layer that can be subjected to actinic ray exposure plate-making through this release layer, thereby forming a pattern. It was found that the resin-made relief printing plate after use can be easily removed from the support sleeve without affecting it, and a new resin relief printing plate can be regenerated on the support sleeve.

That is, the present invention is as follows.
1. A seamless resin relief plate characterized by comprising a synthetic resin layer provided on the surface of the support sleeve so as to be peeled off substantially seamlessly, and further laminated with a resin layer capable of chemical beam exposure plate making. Sleeve construction.
2. 1. The synthetic resin has a glass transition point (Tg) in the range of 30 ° C. to 100 ° C. The resin-made relief-sleeve structure as described in 2. above.
3. 1. The synthetic resin is a sleeve-like heat shrinkable film. Or 2. The resin-made relief-sleeve structure as described in 2. above.
4). Production of a resin-made relief printing sleeve structure having no joints, comprising a step of providing a substantially seamless synthetic resin layer on the surface of the support sleeve, and a step of laminating a resin layer capable of chemical beam exposure plate-making. Method.
5. 3. a step of heat shrinking the synthetic resin layer after providing the synthetic resin layer; The manufacturing method of the relief-made relief-printing sleeve structure as described in 2 above.

  According to the present invention, the subtle difference in height due to the pressure-sensitive adhesive sheet is eliminated, and not only high-definition pattern formation is possible, but also an expensive support sleeve is formed from the resin relief printing sleeve structure used for pattern formation. It can be regenerated and reused any number of times to provide a resin relief sleeve construction.

Hereinafter, the present invention will be described in detail, particularly focusing on preferred embodiments thereof.
The support sleeve according to the present invention is a hollow cylindrical base material, and has a characteristic that the inner diameter of the sleeve can be expanded and expanded by compressed air pressure and can be restored to the original inner diameter when the compressed air pressure is released. preferable.
For the support sleeve, a thin metal substrate made of nickel or the like or at least one fiber reinforced plastic substrate can be used, but a material made of a fiber reinforced plastic substrate is preferable. The reason for this is that the plastic substrate is lighter than the metal substrate and is excellent in transfer and exchange work, and has at least one fiber-reinforced plastic substrate layer that expands and expands by compressed air pressure on its inner surface. The base layer thickness of the upper layer part can be changed arbitrarily to correspond to various repeats, and further by providing an auxiliary function for pattern formation such as an elastic layer on the inner layer or outer peripheral surface, For example, quality can be improved.

  On the other hand, however, the cost of the support sleeve tends to increase more and more, and it is desired that the support sleeve made of at least one fiber-reinforced plastic substrate can be used repeatedly. The support sleeve made of at least one fiber-reinforced plastic substrate has a thin thickness of 0.1 mm to a thickness of 5 mm or more. In particular, the thickness of the support sleeve is 5 mm or more. Since the inner layer has a multilayer structure in which a foam layer such as polyethylene or polyurethane is provided and the surface layer is coated with a hard polyurethane or polyethylene substrate, the product cost as a support sleeve is very high. The effect is effective.

  As the release layer made of a synthetic resin provided in a peelable state on the support sleeve, it is preferable to use a layer that does not chemically bond to the support sleeve surface from the viewpoint of release. However, appropriate adhesiveness or frictional force with the surface of the support sleeve to endure mechanical stress due to sliding stress received during production and pattern formation, chemical stress due to organic solvents such as developing solvents and inks, and It preferably has physical and chemical structural strength.

  In general, pattern formation by the relief printing method is performed in a temperature range of about 20 ° C. from a room temperature atmosphere of about 20 ° C. Therefore, a material whose physical characteristics are rigid in these temperature ranges is desirable. For example, polyvinyl acetate, Thermoplastic resins having a glass transition point (Tg) in the range of 30 ° C. or higher, such as polyamide, polyester, polyvinyl chloride, and polystyrene, more preferably thermoplastics having Tg in the range of 60 ° C. or higher, such as polyester, polyvinyl chloride, and polystyrene. Resin can be used. In addition, because of the use of hydrocarbon or chlorine developer, ink containing alcohol, ester, ether, etc. and organic solvents such as fluorine oil during production and pattern formation, chemical characteristics are stable against these. It is desirable to use polyester as a material satisfying these characteristics.

  On the other hand, when considering adhesiveness or frictional force with the surface of the support sleeve in order to prevent deviation from the support due to sliding stress received during manufacturing and pattern formation as described above, it is also selected depending on the surface of the support sleeve surface. Different synthetic resin materials are used. As a measure of adhesiveness and friction force, the coefficient of friction against the support sleeve substrate to be coated is JIS K7125 (plastic film and sheet friction coefficient test method) with a dynamic friction coefficient of 0.3 or more and a static friction coefficient of 0.4. The above is desirable, more preferably the dynamic friction coefficient is 0.4 or more, and the static friction coefficient is 0.5 or more. However, the properties of the release layer may be satisfied by providing an adhesive layer on the support sleeve surface or the synthetic resin back surface.

  As a method of providing an adhesive layer on the surface of the support sleeve or the back surface of the synthetic resin, for example, a method of applying an adhesive such as glue to the surface of the support sleeve, a method of providing a single-sided adhesive tape as the synthetic resin layer, Examples thereof include a method of applying a liquid thermoplastic adhesive dispersed in a solvent such as water to the surface of the support sleeve. Use of a thermoplastic adhesive is more preferable because a seamless synthetic resin layer can be formed simultaneously with the pressure-sensitive adhesive layer. As a thermoplastic adhesive, what contains at least 1 synthetic resin, such as polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl chloride, polyacryl, polyethylene, can be utilized. An aqueous emulsion solution such as a polyvinyl acetate adhesive is more preferable from the viewpoint of environmental load and handleability. In the case of using polyvinyl acetate as a synthetic resin material, from the viewpoint of resistance to the developer and solvent described above, there is no joint of the relief relief sleeve structure as disclosed in JP-A-2003-025749. It is preferable to provide a configuration in which a barrier layer against an organic solvent or the like entering from the surface layer is provided on the intermediate layer by a method of laminating a resin relief plate through a rigid layer made of a plastic film of 30 μm to 250 μm.

As a method for providing a release layer made of a synthetic resin with these liquid adhesives on the support sleeve, several known coating techniques can be used. In particular, coating methods using a roll coater, spray coater, ring coater, etc. are known as coating techniques for cylindrical sleeves, and these coating techniques consist of a synthetic resin layer that is seamless from the liquid adhesive in the circumferential direction. A release layer can be formed.
In addition, a release layer can be provided on the support sleeve by a solid synthetic resin. For example, a thin single-sided adhesive tape with a thickness of about 30 μm to 150 μm is applied in the width direction of the support sleeve, and the circumferential direction of the support sleeve is overlapped with the same width of tape on the tape width. Examples thereof include a method of covering the whole with a tape, a method of passing a hollow sleeve-like heat-shrinkable film seamless in the circumferential direction through a support sleeve, and shrinking and fixing to the sleeve surface by heating. The former can provide a substantially seamless synthetic resin layer, but the latter is more preferable because the synthetic resin can be fixed to the surface of the support sleeve without any joints.

In the present invention, “substantially no joint” means that there is no joint to the extent that the discontinuous portion of the synthetic resin does not affect the pattern formation on the surface of the workpiece.
As the sleeve-like heat-shrinkable film, a commercially available film can be used, and any film can be used as long as its dimensions change when heated, and is not particularly limited. As a specific example of a preferable material, a film material such as a polymer compound having a block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene, polyvinyl chloride, polyester, or polystyrene can be used. The heat-shrinkable film selected in the present invention is also subjected to the above-mentioned mechanical and chemical stresses during the production and pattern formation. Polyesters are preferred because they are selected from those having structural strength and are chemically resistant to organic solvents.

The thickness of the release layer formed of a synthetic resin is not particularly limited, but is preferably 15 μm or more and 300 μm or less, particularly preferably 15 μm or more and 150 μm or less in consideration of the ease of peeling work and the effect on pattern formation quality. It is. When the release layer is formed using a sleeve-like heat shrinkable film, it is preferably wound around the resin relief printing sleeve with an appropriate pressure when heat-shrinked. In moderate pressure and, for example thin-walled sleeve, it refers to a degree that does not inhibit the extension of the inner surface of the sleeve against the pressure of compressed air supplied to the inner surface of the sleeve during flexographic printing machine cylinder mounted to the support sleeve 100 g / cm ² or more 300g It is preferable to adjust the shrinkage rate so as to be wound at a pressure of / cm ² or less. The pressure is measured by combining a prescale mat manufactured by Fuji Film Co., Ltd. and a prescale for ultra-low pressure (LLLLW) and pasting it on the surface of the support sleeve, and changing the preshrinking film when the heat shrinkable film is shrunk from it. It can be visually confirmed by the color of the scale, and can also be quantified by the fine pressure analysis software for the pressure image analysis system (FPD-9210).

As a method for laminating a resin relief plate on a release layer made of a synthetic resin, a method using a sheet-like photosensitive material as disclosed in the above-mentioned JP-A No. 2003-025749 or JP-A No. 2004-262076. A method using a liquid or hot-melt photosensitive thermoplastic elastomer as disclosed in the publication can be used.
In this invention, the resin layer laminated | stacked on the peeling layer which consists of synthetic resins consists of a resin material in which actinic ray exposure platemaking is possible. In order to adjust the compression characteristics at the time of pattern formation, it may be laminated with a pattern formation auxiliary functional layer such as an elastic foam, and in the form of a sheet from the viewpoint of elastic retention of the foam and stability of pattern formation quality It is desirable to use the photosensitive material.

As the sheet-like photosensitive material laminated on the release layer made of a synthetic resin, a known photosensitive resin plate or rubber plate can be used as a resin relief plate. These resin relief plates can be laminated by laminating with a pattern formation assisting functional layer such as an elastic foam in order to adjust the compression characteristics during pattern formation. The pattern formation auxiliary functional layer to be bonded is made of an elastic foam having continuous or single fine cells, such as polyurethane, polyolefin, polyethylene, polypropylene, and the density thereof is 0.1 g / cm ³ to 0.6 g / cm. ³ Shore A hardness of about 10 to 60 (an elastic foam sheet for flexographic printing as disclosed in JP-A-2-56554, JP-A-3-192359, or JP-A-11-184072) ) Can be used.

  When laminating an elastic foam as a pattern formation auxiliary functional layer, an adhesive is applied to the surface of the support sleeve provided with a release layer using the elastic foam sheet continuous in the length direction cut to a predetermined width. The elastic foam pattern forming auxiliary functional layer seamless in the circumferential direction can be obtained by winding the elastic foam sheet spirally from the coating end toward the other end without gaps. At this time, if a skin layer is provided on at least one of the elastic foam sheets and the skin layer surface and the release layer are bonded to each other, higher adhesive force at the interface can be obtained. It is possible to prevent breakage in the middle and to provide a simpler peeling operation. The pattern formation assisting functional layer thus formed can then be formed to a desired thickness by a grinding apparatus or the like in consideration of required compression characteristics and the like.

  In the present invention, the sheet-like photosensitive resin material is preferably composed mainly of a binder polymer, at least one ethylenically unsaturated monomer, and a photopolymerization initiator, and has characteristics required for the photosensitive resin material. A sensitizer, a thermal polymerization inhibitor, a plasticizer, a colorant and the like can be added accordingly. In many cases, the photopolymerization initiator is sensitive to actinic rays such as ultraviolet rays. By exposing these photosensitive resin materials to actinic rays such as ultraviolet rays through a desired image-like mask, light in the exposed area is exposed. The polymerizable layer becomes insoluble and the convex relief can be developed with a suitable developer.

  Lamination of a sheet-like photosensitive resin material to a support sleeve provided with a release layer or a sleeve having a pattern formation auxiliary functional layer laminated on the surface thereof is disclosed in Japanese Patent Application Laid-Open No. 2003-025749. It can be done by the method. For example, first, the photosensitive resin sheet is wound in the circumferential direction of the sleeve and the ends of the photosensitive resin sheet joined in the width direction are heat-sealed. At this time, it is preferable to cut the length and the cut end face accurately and sharply so that the gap between the ends of the photosensitive resin sheet is not formed or overlapped. In addition, foreign matters mixed into the joints may cause formation defects when the flexographic relief is finally formed, and therefore it is preferable to work in a cleaner environment with less dust. Furthermore, it is possible to prevent bonding failure due to air intervening at the bonding interface at the end of the wound photosensitive resin sheet and the bonding interface with the support sleeve provided with the release layer or the sleeve on which the pattern formation auxiliary function layer is laminated. For this reason, it is preferable that the intervening air is removed using a decompression device or the like, and the interface to be joined is wound in a state of higher vacuum and heat-bonded.

  A support sleeve provided with a release layer wrapped with a photosensitive resin sheet or a sleeve having a flexographic relief auxiliary functional layer laminated on its surface is placed in an oven using a heat source such as an infrared heater while maintaining a degree of vacuum at the interface. In addition, the end portions of the photosensitive resin sheet can be fused together by directly or indirectly heating the photosensitive resin to the softening point or higher. The photosensitive resin sleeve that has been heat-fused can be cooled to a room temperature environment and then ground to a desired diameter by a grinding device or the like.

  Since the surface of the photosensitive resin processed by the grinding apparatus is reflected as it is in the final pattern formation image, it is preferable that the surface is processed with heat, a solvent, or the like according to the use of pattern formation. An infrared sensitive layer can be laminated | stacked by apply | coating an infrared sensitive solution to the surface. The infrared sensitive layer is obtained by applying a solution containing at least a solvent-soluble or dispersible binder polymer, an infrared absorbing substance, and a non-infrared shielding substance to the surface of the photosensitive layer resin layer, and can be excised by infrared rays. It has the property of shielding infrared rays.

As a method of applying and laminating an infrared sensitive solution on the surface of the photosensitive resin layer, a ring coater, a spray coater, a roll coater or the like can be used. The thickness of the infrared sensitive layer is determined in consideration of the sensitivity of cutting with an infrared laser and the non-infrared shielding effect, but is preferably 0.1 g / m ² to 20 g / m ² , more preferably 1 g / m ² to 5 g. set in the range of / ^{m 2.}
The sleeve having the infrared-sensitive layer laminated in this way is formed by image-cutting the infrared-sensitive layer by infrared laser drawing to form a negative mask, through which the photosensitive resin layer is irradiated with actinic radiation, and then suitable. A desired convex relief can be developed by washing out the photosensitive resin in the non-irradiated portion and the mask remaining in the surface layer portion using an appropriate developer.

As the infrared laser used in this step, one having a wavelength of 750 nm to 2000 nm can be used. Examples of this type of infrared laser include a semiconductor laser with a wavelength of 750 to 880 nm and a Nd-YAG laser with a wavelength of 1060 nm. These laser generation units can be controlled by a computer together with the drive system unit. By selectively removing the non-infrared shielding layer on the photosensitive resin layer, the digitized image information is converted into an infrared sensitive layer. It can be applied to a negative mask.
After the drawing of the negative mask by the infrared laser is completed, the photosensitive resin layer can be irradiated with actinic radiation and photocured. As the actinic light source, a high-pressure mercury lamp, an ultraviolet fluorescent lamp, a carbon arc lamp, a xenon lamp, sunlight, or the like can be used. However, these actinic light sources are all point or line light sources, and when irradiating the cylindrical photosensitive resin layer surface, irradiation may be performed so as to show uniform actinic intensity distribution in the circumferential direction and the width direction. preferable.

After forming the image by irradiating the photosensitive resin layer with actinic radiation, it is preferable to wash out the remaining infrared-sensitive layer and the uncured portion of the photosensitive resin layer. Any developer can be used as long as it can dissolve the photosensitive resin layer. For example, esters such as peptyl acetate and 3-methoxybutyl acetate, petroleum fractions, toluene and decalin can be used. Hydrocarbons such as chlorinated solvents such as tetrachloroethylene can be used. Moreover, what mixed alcohols, such as propanol, butanol, and pentanol, in these solvents can also be used.
The uncured portions of the infrared sensitive layer and the photosensitive resin layer can be washed out by jetting a developer from a nozzle or by brushing with a developer and a brush. The obtained resin relief printing relief is rinse-washed, and after drying, post-exposure is performed to finish, and a seamless resin relief printing sleeve structure is obtained.

  The seamless resin relief sleeve structure obtained in this way is subjected to pattern formation and then cut into the synthetic resin layer with a knife or the like, or peeled off as it is, or if it is a thermoplastic, it is brought to the plasticizing temperature. The plastic layer softened by heating can be removed from the support sleeve surface together with the relief function layer by peeling off the plastic layer while plastically deforming.

Embodiments of the present invention will be specifically described based on examples.
[Example 1]
A support sleeve (Blue Light Sleeve (trade name) / Rotec) having an inner diameter of 146.539 mm, an outer diameter of 159.938 mm, and a surface length of 1630 mm is mounted on a spray coating machine (COATING STAND / AV flexologic), and in the circumferential direction. While rotating at a speed of 60 rpm, a vinyl acetate emulsion solution (CH3000L (trade name) / Konishi Bond Co., Ltd.) is sprayed uniformly over the entire sleeve surface at a wet coating amount of 150 g / m ² , and then a hot air dryer (VERTICL OVEN) / AV flexological) was dried at 60 ° C. for 10 minutes to obtain a sleeve covered with a seamless sleeve surface and a peelable synthetic resin layer.

After the sleeve is cooled to room temperature, it is attached to a packaging device (WARP / AV flexological), and a urethane adhesive (KU822S (trade name) / Konishi Bond) is applied to the entire sleeve surface while rotating at a speed of 30 rpm. Roll coating was uniformly performed at a work amount of 30 g / m ² . At this time, a single-sided adhesive tape (Diahalo Tape (trade name) / Mitsubishi Resin Co., Ltd.) having a width of 24 mm is wound around the sleeve in the circumferential direction around the sleeve to form an adhesive mask, and the tape is peeled off after application. The adhesive material was prevented from entering the end of the sleeve.
An elastic foam material (R-bak PSA single-sided skin (trade name) / Rogers) having a width of 80 mm and a thickness of 1.02 mm is disposed on the adhesive surface, and the skin surface is disposed on the adhesive side from the adhesive application end. The sleeve was wound around the other application end without any gaps so as to wrap in a spiral shape, and left at room temperature for 1 hour to fix the adhesive. Thereafter, the sleeve was attached to a grinding apparatus (SA6 / 2U × 200 / Schlife Maschinenwerk), and the surface of the elastic foam material was ground until the outer diameter became 158.938 mm.

An exposure apparatus for an ultraviolet lamp having a main wavelength of 370 nm from the cover film side of a photosensitive resin sheet for flexographic printing (AFP CTH-10 (trade name) / Asahi Kasei Chemicals) having a thickness of 2.10 mm and a size of 1067 mm × 1524 mm (EXPOSURE / (AVflexology) was irradiated with ultraviolet rays for 40 seconds, and both ends were equally cut with a plate cutting machine (CUTTING TABLE / AV flexologo) so that the short side was 513.457 mm.
Attach the sleeve that has finished grinding the elastic foam material to the lapping device again, peel off the cover film of the cut photosensitive resin sheet, place the peeled surface on the elastic foam material side, and place the short side of the photosensitive resin sheet. The sleeve was wrapped so as to wrap around the sleeve in the circumferential direction, and the joints on the long sides were temporarily fixed with a single-sided adhesive tape so that the photosensitive resin sheet did not fall off the sleeve.

  A vacuum pressure of −0.8 bar is applied to the interface between the elastic foam material and the photosensitive resin sheet by using a pressure reducing device in order to make the wound photosensitive resin sheet completely adhere to the elastic foam material on the sleeve. Then, the long sides of the photosensitive resin sheet were temporarily joined in order so that both ends of the long side of the photosensitive resin sheet were brought close to each other from the sleeve end so that the long side of the photosensitive resin sheet was in vacuum contact. Further, the support film on the outer peripheral surface of the photosensitive resin sheet is peeled off in this reduced pressure state, and heated until the resin surface temperature becomes 110 ° C. in an infrared heating furnace (CURING OVEN / AV flexologic), and temporarily joined. The photosensitive resin sheet was completely fused to the end face and the elastic foam material surface.

Next, after the sleeve taken out from the heating furnace was cooled to room temperature, it was attached to the grinding device again, and the surface of the photosensitive resin was ground until the outer diameter became 162.468 mm. Thereafter, the surface is mirror-finished in a surface treatment apparatus (ARC-110H / Asahi Kasei Chemicals), and a solution containing synthetic rubber and carbon black as main components in a spray coating machine (ARC-110B / Asahi Kasei Chemicals) ( XBL-B53 (trade name) / Asahi Kasei Chemicals Corporation) was spray coated to obtain an infrared sensitive layer on the surface.
On this sleeve, 150-line / inch continuous pattern image data was drawn with a laser irradiation apparatus (CDI / ESKO graphics) using a YAG laser as a light source to form a negative image mask of an infrared sensitive layer. Through this image mask, an ultraviolet ray of 8000 mJ was irradiated under a UV intensity of 10 mW / cm ² (UV35) on the irradiated surface by a cylindrical exposure apparatus (MAIN EXPOSURE / AVflexology) of an ultraviolet lamp having a dominant wavelength at 370 nm.

  Then, it was washed out with a brush using an aromatic hydrocarbon solvent (SOLVIT (trade name) / Exxon Chemical Co., Ltd.) with a cleaning device (AFS-1316IP / Asahi Kasei Chemicals Co., Ltd.) and dried at 60 ° C. for 1 hour. In order to remove the adhesiveness of the surface, exposure was carried out for 20 minutes with a germicidal lamp having a wavelength of 254 nm for 5 minutes with an ultraviolet lamp having a dominant wavelength at 370 nm to obtain a seamless resin relief printing sleeve structure. .

  Using the resin letterpress sleeve structure of the present invention obtained by the above operation, printing was repeated 1 million m with water-based ink on carton paper at a speed of 300 m / min with a flexographic printing machine (wind mirror stack). . Thereafter, the sleeve was heated at 60 ° C. for 10 minutes in a hot air heating furnace, cut with a knife from the resin surface layer of the sleeve to the foam sheet, and lifted so that the resin relief printing layer was peeled off from the support sleeve from the cut surface The resin relief printing functional layer could be completely removed together with the release layer, and the removed support sleeve surface exhibited a surface state unchanged from that before use.

[Example 2]
A sleeve-shaped heat-shrinkable shrink film (high sleeve) having a thickness of 30 μm and a folding width of 210 mm on a support sleeve (Blue Light Sleeve (trade name) / Rotec) having an inner diameter of 86.060 mm, an outer diameter of 101.906 mm, and a surface length of 412 mm G101 (trade name) / Toko Kogyo Kogyo Co., Ltd.) is placed on the support sleeve, and when the film shrinks at both ends of the surplus film, the cellophane tape is wrapped around the support sleeve to leave the air passage opening. Sealed in film. Next, the sleeve was placed in a hot air dryer (VERTICL OVEN / AV flexological), and hot air at 60 ° C. was sprayed uniformly over the film for 3 minutes to shrink the entire film. Excess film was cut with a knife along the end edge of the support sleeve to obtain a sleeve coated with a peelable synthetic resin layer and a sleeve surface without a joint on the sleeve surface.

  Thereafter, the same operation as in Example 1 was performed until the final operation to obtain a seamless resin relief sleeve structure. After being subjected to pattern formation in the same manner as in Example 1, the shrink film was cut in the width direction from the end of the support sleeve. As a result, the resin relief printing functional layer could be completely removed together with the film release layer, and the removed support. The surface of the sleeve exhibited the same surface state as that before use.

[Comparative example]
Without applying the vinyl acetate emulsion solution in the example to the surface of the support sleeve, the adhesive was directly applied to the surface of the support sleeve, and thereafter a resin relief printing sleeve structure was obtained by the same operation as in the example. . After giving a printing history similar to that of the example, an attempt was made to remove the resin relief printing layer from the sleeve surface, but it could not be removed because it was firmly adhered to the support sleeve surface. For this reason, an attempt was made to grind and remove the resin relief printing functional layer with a grinding machine, but it took a very long time to grind and scratched the surface of the support sleeve with a grinding wheel, so that the support sleeve was restored to its original state. I couldn't.

  The seamless resin relief sleeve structure of the present invention can be suitably used in the field of reuse of expensive support sleeves and relief printing.

1 is a basic cross-sectional view of a seamless resin relief sleeve structure according to the present invention.

Explanation of symbols

01: Resin relief layer 02: Resin relief auxiliary function layer 03: Synthetic resin layer (peeling layer)
04: Support sleeve layer

Claims (5)

  A seamless resin relief plate characterized by comprising a synthetic resin layer provided on the surface of the support sleeve so as to be peeled off substantially seamlessly, and further laminated with a resin layer capable of chemical beam exposure plate making. Sleeve construction.   The seamless resin relief sleeve structure according to claim 1, wherein the synthetic resin has a glass transition point (Tg) in the range of 30 ° C to 100 ° C.   The resin-made relief printing sleeve structure according to claim 1 or 2, wherein the synthetic resin is a sleeve-like heat shrinkable film.   A method for producing a seamless resin relief printing sleeve structure comprising the steps of providing a substantially seamless synthetic resin layer on the surface of a support sleeve, and laminating a resin layer capable of actinic radiation exposure plate making. .   The method for producing a seamless resin relief sleeve structure according to claim 4, further comprising a step of thermally shrinking the synthetic resin layer after providing the synthetic resin layer.

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