JP2008094030A - Hollow cylindrical support for printing base material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow cylindrical support for a printing base material which not only can prevent a dent from being generated during attaching the support to or detaching it from a plate cylinder but also can simply allow registering of the position of the support to the plate cylinder. <P>SOLUTION: This hollow cylindrical support for the printing base material is manufactured by welding together both end parts of a metallic sheet molded in a cylindrical shape. A projecting part is formed at least on a part, on the inside surface, of the welding part of the metallic hollow cylinder, and a resin cured product layer with not less than 50 μm to not more than 20 mm in thickness, is laminated on the outside surface of the metallic cylinder. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hollow cylindrical support for a printing substrate used in a printing process.

  In the printing field such as flexographic printing and dry offset printing, a sheet-shaped photosensitive resin plate having a pattern formed on the surface through an exposure / development process using a photosensitive resin and photolithography is often used. When a sheet-like printing plate is used, in the printing process, the sheet-like printing plate is fixed while being aligned with the plate cylinder of a printing press. At this time, when multi-color printing is performed, there are as many plate cylinders as the number of colors of the ink used, and the sheet-like printing plate corresponding to each color has to be positioned correctly unless it is aligned. There is a big problem that the print quality is deteriorated such as deviation. Further, since a large amount of time has been spent in the above-described alignment process, it is strongly desired to shorten the time.

  Therefore, in recent years, a technique has been developed in which a printing original plate or a printing plate is laminated on a fiber reinforced plastic sleeve to simplify the alignment process. By forming the printing original plate or printing plate on the sleeve, it has become possible to significantly reduce the time required for alignment. At this time, an air cylinder having a small hole through which air is blown is used, and the sleeve is slightly swelled by the pressure of the air blown from the small hole, and can be easily attached to and detached from the air cylinder.

  However, since the fiber-reinforced plastic sleeve is manufactured through a time-consuming process, it requires a lot of manufacturing time and inevitably becomes expensive. .

  Also, a metal sleeve using a material such as nickel is available. However, since it is manufactured using a plating technique, it is expensive like a fiber reinforced plastic sleeve.

  Furthermore, since the metal sleeve is several hundred μm even if it is thick, undeterminable defects such as dents are likely to occur, and great care must be taken when loading and unloading the plate cylinder such as an air cylinder. .

  In patent document 1 (patent 2851569 gazette), the method of grind | polishing and removing a convex part was welded so that a convex part may not generate | occur | produce in a welding part, while welding the both ends of a metal sheet. Since a method such as polishing is used, a lot of time is required for production, which inevitably leads to an increase in cost. In this method, there is no projection in the joint where the metal sheet is welded, and the inner surface is flat, so there is no idea of using this joint as a reference for alignment, and there is no description in the specification. Absent.

  Even when alignment is performed on the plate cylinder using a fiber reinforced plastic sleeve or a metal sleeve, alignment in the major axis direction and the circumferential direction of the plate cylinder is required. Therefore, there is a demand for further shortening of the alignment time.

As described above, in the prior art, there is no known technique for manufacturing a sleeve at a low cost and a technique for further shortening the alignment time.
Japanese Patent No. 2851569

  An object of the present invention is to provide an inexpensive hollow cylindrical support that can prevent the formation of dents when being attached to and detached from the plate cylinder and that can be more easily aligned with the plate cylinder.

The present inventors have intensively studied to achieve the above object, and at least the inner surface of the welded portion of the metal hollow cylinder produced by welding both ends of the metal sheet formed into a cylindrical shape, The above problem is solved by using a hollow cylindrical support for a printing substrate having a convex portion at least in a part of the welded portion and a cured resin layer laminated on the outer surface of the hollow metal cylinder. The present inventors have found that this can be done and have completed the present invention. That is, in the first aspect of the present invention,
1. A hollow cylindrical support for a printing substrate produced by welding both ends of a metal sheet formed into a cylindrical shape,
A cured resin layer having a thickness of 50 μm or more and 20 mm or less is formed on at least a part of the welded part of the hollow metal cylinder and has a convex part on at least a part of the welded part. A hollow cylindrical support for a printing substrate, characterized in that
2. Item 1 above, wherein the metal sheet has a thickness of 10 μm or more and 500 μm or less, and a linear projection having a width of 10 μm or more and 2 mm or less and a thickness of 5 mm or less exists in the welded portion. A hollow cylindrical support for a printing substrate as described in
3. The metal is a single metal selected from the group consisting of iron, aluminum, nickel, chromium, copper, titanium, zinc, tungsten, and tantalum, or an alloy, laminate, or joint including the above-mentioned type of metal. 3. A hollow cylindrical support for a printing substrate according to item 1 or 2, characterized in that
4). The method for welding both ends of the metal sheet is at least one selected from the group consisting of laser welding, arc welding, electron beam welding, electroslag welding, ultrasonic welding, and resistance welding. A hollow cylindrical support for a printing substrate according to any one of items 1 to 3, characterized in that the method is a method,
5. The hollow cylindrical support for a printing substrate according to any one of the preceding items 1 to 4, wherein the cured resin layer has no seam,
6). The hollow cylindrical shape for a printing substrate according to any one of the preceding items 1 to 5, wherein at least one of the cured resin layers is formed of a cured photosensitive resin (α). Support,
7). 7. The hollow cylindrical support for a printing substrate according to item 6 above, wherein the cured photosensitive resin (α) is obtained by photocuring the liquid photosensitive resin composition (a) at 20 ° C. ,
8). The hollow cylindrical support for a printing substrate according to any one of 1 to 7 above, wherein the Shore D hardness of the cured resin layer is 5 degrees or more and 100 degrees or less,
I will provide a.

According to the second aspect of the present invention,
9. 9. A photosensitive resin composition layer (β), a photosensitive resin cured product layer (which can form a concavo-convex pattern on the surface, on the hollow cylindrical support for a printing substrate according to any one of 1 to 8 above. a hollow cylindrical printing substrate characterized in that a cured photosensitive resin layer (δ) having a γ) layer or a concavo-convex pattern formed on the surface thereof is laminated,
10. 10. The hollow cylindrical printing substrate according to item 9 above, wherein the method of forming a concavo-convex pattern on the surface is a photoengraving method or a laser engraving method,
I will provide a.

Furthermore, according to the third aspect of the present invention,
11. A method of mounting the hollow cylindrical printing substrate according to the preceding item 9 on a cylinder of a printing machine,
On the surface of the cylinder, a linear concave portion is formed in the major axis direction of the cylinder, and is welded in a linear shape present in the innermost hollow metal cylindrical support of the hollow cylindrical printing substrate. A method for a hollow cylindrical printing base material, characterized in that the joint is fitted into a recess formed on the cylinder surface and used as a reference for alignment,
12 The method of the hollow cylindrical printing substrate according to 11 above, wherein the cylinder is an air cylinder having fine holes for ejecting air, and is used in a laser engraving process or a printing process,
13. The hollow cylindrical printing substrate according to any one of the preceding items 9 or 10, wherein the hollow cylindrical printing substrate is used in flexographic printing, dry offset printing or letter press printing,
I will provide a.

  According to the present invention, it is possible to provide an inexpensive hollow cylindrical support body that can prevent the formation of a dent at the time of loading and unloading to a plate cylinder, and can perform alignment more simply.

  The following embodiment is an example for explaining the present invention, and is not intended to limit the present invention only to this embodiment. The present invention can be implemented in various forms without departing from the gist thereof.

  FIG. 1 shows a schematic view of a hollow cylindrical support for a printing substrate according to the present invention, and FIG. 1 (A) shows a schematic perspective view of the hollow cylindrical support for a printing substrate. B) and 1 (C) show a schematic cross-sectional view of a part of the support. The hollow cylindrical support 10 for a printing substrate according to the present invention has a cured resin layer on the outer surface of a metal hollow cylinder produced by welding both ends of a metal sheet 12 formed into a cylindrical shape. 18 are stacked.

  In FIG. 1B, when both end portions of the metal sheet 12 are welded, the weld portion 14 swells substantially upward from the metal sheet, whereas in FIG. The part 14 is recessed substantially below the metal sheet 12. The hollow cylindrical support for a printing substrate according to the present invention is limited to the relationship between the welded portion 14 and the metal sheet 12 as exemplified in FIGS. 1 (B) and 1 (C). is not.

  Here, the term “printing substrate” used in the present invention means a material used in the printing field, and is used for printing plates, blankets, and the like. The printing plate can be used as a printing plate such as a flexographic printing plate, a dry offset printing plate, a letter press printing plate, and a gravure printing plate. It can also be used as a cushion in flexographic printing and as a blanket in offset printing.

  There are linear convex portions 16 having a width of 10 μm or more and 2 mm or less and a thickness of 2 mm or less at both ends of the welded metal sheet 12, and the convex portions 16 are at least inside the hollow metal cylinder and are welded portions. 14 in at least a portion. Due to the presence of the convex portions having the above-mentioned dimensions, it can be used as an alignment portion when being mounted on a plate cylinder of a printing press or a cylinder during laser engraving. The presence of the convex portion 16 can greatly simplify and shorten the alignment process. The thickness of the convex portion 16 means the height of a portion protruding from the reference surface with the surface of the metal sheet 12 as the reference surface. The shape of the convex portion 16 is not particularly limited, and the cross-sectional shape when cut along a plane perpendicular to the long axis of the metal hollow cylinder may be a semicircular shape, a semielliptical shape, or a polygonal shape. From the viewpoint of forming a reference for accurately performing alignment, it is preferable to match the shape of the recess formed on the surface of the air cylinder to which the metal hollow cylinder is mounted.

  The metal material of the hollow cylindrical support 10 for a printing substrate according to the present invention is a single metal selected from the group consisting of iron, aluminum, nickel, chromium, copper, and titanium, or an alloy, a laminate, or a bonded product. It is preferable. The laminate refers to a structure in which different kinds of metals are laminated using a method such as a plating method, a vapor deposition method, a pressure bonding method, and an adhesion method using an adhesive. Moreover, a joined material means the structure melt | dissolved and bonded by methods, such as a welding method.

In the present invention, the method for welding both ends of the metal sheet is at least selected from the group consisting of laser welding, arc welding, electron beam welding, electroslag welding, ultrasonic welding, and resistance welding. One method is preferred. In particular, the laser welding method is a particularly preferable method from the viewpoint of good finish of the joint, the size of the convex portion 16 to be formed, and simplicity. The laser used in the laser welding method is preferably a solid laser such as a carbon dioxide laser, YAG laser, YLF laser, or YVO ₄ laser, a laser having an oscillation wavelength in the wavelength region of 800 nm to 15 μm, such as a semiconductor laser or a fiber laser. . The oscillation mode may be a continuous wave laser or a pulsed laser.

  The thickness of the metal sheet 12 forming the hollow cylindrical support 10 for a printing substrate according to the present invention is preferably 10 μm or more and 500 μm or less. More preferably, they are 50 micrometers or more and 200 micrometers or less, More preferably, they are 80 micrometers or more and 150 micrometers or less. If it is this thickness range, the attachment or detachment to an air cylinder can be implemented easily. The metal sheet is preferably cut while accurately measuring the dimensions. The cutting method is not particularly limited, and can be carried out using a normal method. However, from the viewpoint of the shape stability of the cut surface, a method of running a laser beam with a narrowed beam diameter is preferable.

  Further, when welding both end portions of the metal sheet 12 formed into a cylindrical shape, the metal protrusion 12 can be formed with accurate dimensions on the inner side of the metal hollow cylinder to be formed. It is preferable to dispose a mold having a concave portion corresponding to the convex portion 16 formed on the surface under the sheet 12.

  The thickness of the cured resin layer 18 formed on the outer surface of the metal hollow cylinder is preferably 10 μm or more and 20 mm or less. More preferably, they are 50 micrometers or more and 10 mm or less, More preferably, they are 100 micrometers or more and 2 mm or less.

  At least one layer of the cured resin layer 18 used in the present invention comprises a cured photosensitive resin (α), a thermosetting resin obtained by irradiating the photosensitive resin composition (a) with high energy rays and curing it. Examples thereof include a cured resin obtained by thermosetting, a cured rubber material obtained by vulcanizing a rubber-based material, and the like. In the present invention, the cured resin layer 18 may be used in combination with the cured product. From the viewpoint of curing speed, the photosensitive resin composition (a) is particularly preferable. Examples of the high energy ray used for curing the photosensitive resin composition (a) include light having an emission wavelength in the ultraviolet region and visible light region, an electron beam, an X-ray, and a molecular beam.

  The Shore D hardness of the cured resin layer 18 used in the present invention is preferably 10 degrees or more and 100 degrees or less. More preferably, they are 20 degree | times or more and 100 degrees or less, More preferably, they are 30 degree | times or more and 100 degrees or less. If the Shore D hardness of the resin cured product layer 18 used in the present invention is in the above range, the strength of the formed hollow cylindrical support 10 for a printing substrate can be sufficiently secured and used stably for a long period of time. it can.

  Specific examples of the resin composition for obtaining the cured resin layer 18 used in the present invention are not limited to the following, but include a photosensitive resin composition (a) and a thermosetting resin composition. be able to. In the present invention, a particularly preferable photosensitive resin composition (a) is described below. The photosensitive resin composition (a) used in the present invention contains a resin (b) having a number average molecular weight of 1,000 to 500,000 and an organic compound (c) having a polymerizable reactive group having a number average molecular weight of less than 1,000. preferable.

  The photosensitive resin composition (a) may be liquid or solid at 20 ° C., but is preferably liquid at 20 ° C. for ease of moldability.

  The resin (b) in the photosensitive resin composition (a) may be liquid or solid at 20 ° C., but is preferably a liquid resin at 20 ° C. from the viewpoint of molding processability. Here, the liquid resin means a polymer that has the property that it can be easily fluidly deformed and solidified into a deformed shape by cooling. It is a term corresponding to an elastomer having the property of deforming instantaneously according to the external force when an external force is applied and recovering the original shape in a short time when the external force is removed. When the resin (b) is a liquid resin at 20 ° C., the photosensitive resin composition also becomes a liquid at 20 ° C., and good thickness accuracy and dimensional accuracy can be obtained when it is formed into a sheet or cylinder. it can. When the liquid photosensitive resin is used, the viscosity of the photosensitive resin composition (a) is preferably 10 Pa · s or more and 10 kPa · s or less at 20 ° C. More preferably, it is 50 Pa · s or more and 5 kPa · s or less. If the viscosity is 10 Pa · s or more, the mechanical strength of the produced printing substrate is sufficient, and the shape can be easily maintained and processed even when it is formed into a cylindrical shape. If the viscosity is 10 kPa · s or less, it is easy to be deformed and processed easily without increasing the temperature. It is easy to form into a sheet-like or cylindrical printing substrate, and the process is simple. In particular, in order to obtain a printing substrate with high thickness accuracy, the viscosity is 100 Pa · s or more, preferably 200 Pa · s or more, more preferably so that the photosensitive resin composition does not cause a phenomenon such as liquid dripping due to gravity. A photosensitive resin composition having a relatively high viscosity of 500 Pa · s or more is desirable.

  The number average molecular weight of the resin (b) is 1,000 to 500,000, preferably 5,000 to 200,000, more preferably 10,000 to 100,000. If the number average molecular weight of the resin (b) is 1000 or more, a cylindrical support produced by crosslinking later maintains strength, and can be used repeatedly when used as a printing substrate. The upper limit of the number average molecular weight of the resin (b) is preferably 500,000 or less. If it is 500,000 or less, the viscosity of the photosensitive resin composition will not increase excessively, and a complicated processing method such as heat extrusion is not required when forming into a sheet or cylinder. The number average molecular weight referred to here is a value measured by gel permeation chromatography, calibrated with polystyrene having a known molecular weight, and converted.

  The resin (b) may have a polymerizable unsaturated group in the molecule. Particularly preferred are polymers having an average of 0.7 or more polymerizable unsaturated groups per molecule. When the average is 0.7 or more per molecule, the printing original plate obtained from the photosensitive resin composition is excellent in mechanical strength, and the relief shape is difficult to collapse during laser engraving. Furthermore, its durability is good, and it can withstand repeated use, which is preferable. In consideration of the mechanical strength of the printing original plate, the polymerizable unsaturated group of the resin (b) is preferably 0.7 or more per molecule, and more preferably more than 1. The abundance ratio of the polymerizable unsaturated group in the resin (b) can be quantified using a high resolution nuclear magnetic resonance spectrum method (NMR method). The term “intramolecular” as used herein includes the case where a polymerizable unsaturated group is directly attached to the terminal of the polymer main chain, the terminal of the polymer side chain, the polymer main chain, or the side chain. The polymerizable unsaturated group of the present invention is defined as a polymerizable unsaturated group involved in a radical or addition polymerization reaction. Preferable examples of the polymerizable unsaturated group involved in the radical polymerization reaction include a vinyl group, an acetylene group, an acrylic group, and a methacryl group. Preferred examples of the polymerizable unsaturated group involved in the addition polymerization reaction include cinnamoyl group, thiol group, azide group, epoxy group that undergoes ring-opening addition reaction, oxetane group, cyclic ester group, dioxirane group, spiroorthocarbonate group, spiro An ortho ester group, a bicyclo ortho ester group, a cyclic imino ether group and the like can be mentioned.

  As a method for introducing a polymerizable unsaturated group into the molecule of the resin (b), for example, a method in which a polymerizable unsaturated group is directly introduced into the molecular end may be used. Alternatively, a hydroxyl group, The above components having a molecular weight of about several thousand having a plurality of reactive groups such as amino group, epoxy group, carboxyl group, acid anhydride group, ketone group, hydrazine residue, isocyanate group, isothiocyanate group, cyclic carbonate group, ester group After reacting with a binder having a plurality of groups capable of binding to the reactive group (for example, polyisocyanate in the case of a hydroxyl group or an amino group), adjusting the molecular weight and converting to a terminal binding group, A method such as a method of introducing a polymerizable unsaturated group into the terminal by reacting with a terminal reactive group and an organic compound having a polymerizable unsaturated group is preferable.

  The organic compound (c) in the photosensitive resin composition (a) is preferably a compound having a number average molecular weight of less than 1000 and having a polymerizable reactive group in the molecule. The polymerizable reactive group is a functional group that contributes to radical polymerization reaction, addition polymerization reaction, and ring-opening addition polymerization reaction. Preferable examples of the polymerizable reactive group involved in the radical polymerization reaction include a vinyl group, an acetylene group, an acrylic group, and a methacryl group. Preferred examples of the polymerizable reactive group involved in the addition polymerization reaction include a cinnamoyl group, a thiol group, an azide group, an epoxy group that undergoes a ring-opening addition reaction, an oxetane group, a cyclic ester group, a dioxirane group, a spiro ortho carbonate group, and a spiro ortho group. Examples include an ester group, a bicycloorthoester group, and a cyclic imino ether group. Considering the ease of dilution with the resin (b), the number average molecular weight is preferably 1000 or less. Examples of the organic compound (c) include olefins such as ethylene, propylene, styrene and divinylbenzene, acetylenes, (meth) acrylic acid and derivatives thereof, haloolefins, unsaturated nitriles such as acrylonitrile, (meth) acrylamide and Derivatives thereof, allyl compounds such as allyl alcohol and allyl isocyanate, unsaturated dicarboxylic acids such as maleic anhydride, maleic acid and fumaric acid and derivatives thereof, vinyl acetates, N-vinylpyrrolidone, N-vinylcarbazole, cyanate esters, etc. However, (meth) acrylic acid and its derivatives are preferable examples from the viewpoints of the abundance of the types and the price.

  The molecular structure of the organic compound (c) includes an alicyclic hydrocarbon skeleton such as a cycloalkyl skeleton, a bicycloalkyl skeleton, a cycloalkene skeleton, and a bicycloalkene skeleton, a benzyl group, a phenyl group, a phenoxy group, a naphthyl group, and a pyrenyl group. Aromatic hydrocarbon skeleton, alkyl group, halogenated alkyl group, alkoxyalkyl group, hydroxyalkyl group, aminoalkyl group, tetrahydrofurfuryl group, molecular structure having glycidyl group, alkylene glycol, polyoxyalkylene glycol, polyalkylene Examples thereof include ester compounds of polyhydric alcohols such as glycol and trimethylolpropane.

  In the present invention, the organic compound (c) having a polymerizable reactive group can be selected from one type or two or more types according to the purpose. When an electronic material or an optical material is applied as a printing substrate, at least one long-chain aliphatic, alicyclic or aromatic derivative is used as an organic compound used to suppress swelling with respect to a solvent contained in the electronic material or optical material. It is preferable to have more than one type.

  The measuring method of the number average molecular weight (Mn) of the organic compound (c) used for this invention is demonstrated. It is dissolved in a solvent in which the organic compound (β) is dissolved, analyzed by gel permeation chromatography (GPC method), and converted to standard polystyrene with a known molecular weight to calculate the number average molecular weight (Mn). This method is used for compounds having a wide molecular weight distribution. As a measure for the molecular weight distribution, the ratio of the number average molecular weight (Mn) and the weight average molecular weight (Mw) calculated simultaneously with Mn, that is, the polydispersity (Mw / Mn) is used. When the polydispersity is 1.1 or more, the number average molecular weight determined by the GPC method is adopted on the assumption that the molecular weight distribution is wide. In addition, those having a polydispersity of less than 1.1 have a very narrow molecular weight distribution, so that molecular structure analysis is possible, and the molecular weight calculated using nuclear magnetic resonance spectroscopy (NMR method) or mass spectrometry is the number average. The molecular weight.

  When a thermosetting resin composition or a vulcanized rubber material is used as the resin composition of the present invention, a cured resin product is obtained using heat. The method of installing in a high temperature reaction tank, the method of heating directly using an infrared lamp etc. can be mentioned.

  When a photosensitive resin composition is used as the resin composition of the present invention, a method of curing the photosensitive resin composition by irradiation with light, that is, ultraviolet rays, visible rays, or electron beams is preferable. When photocuring using ultraviolet rays or visible light, a photopolymerization initiator can be added. The photopolymerization initiator can be selected from those commonly used. For example, photopolymerization of radical polymerization, cationic polymerization, and anionic polymerization exemplified in “Polymer Data Handbook-Basic Edition” edited by the Society of Polymer Science, published in 1986 by Fufukan. A polymerization initiator can be used. As a photopolymerization initiator for inducing a radical polymerization reaction, a hydrogen abstraction type photopolymerization initiator and a decay type photopolymerization initiator are used as particularly effective photopolymerization initiators.

  Although it does not specifically limit as a hydrogen abstraction type photoinitiator, It is preferable to use an aromatic ketone. Aromatic ketone is efficiently converted into an excited triplet state by photoexcitation, and a chemical reaction mechanism has been proposed in which this excited triplet state extracts radicals from surrounding media to generate radicals. The generated radical is considered to be involved in the photocrosslinking reaction. As the hydrogen abstraction type photopolymerization initiator used in the present invention, any compound may be used as long as it is a compound capable of generating a radical by extracting hydrogen from a surrounding medium through an excited triplet state. Examples of the aromatic ketone include benzophenones, miherer ketones, xanthenes, thioxanthones, and anthraquinones, and it is preferable to use at least one compound selected from these groups. Benzophenones refer to benzophenone and its derivatives, and specifically include 3,3 ', 4,4'-benzophenone tetracarboxylic anhydride, 3,3', 4,4'-tetramethoxybenzophenone and the like. Miherer ketones refer to miherer ketone and its derivatives. Xanthenes refer to derivatives substituted with xanthene and an alkyl group, phenyl group, or halogen group. Thioxanthones refer to thioxanthone and derivatives substituted with an alkyl group, a phenyl group, and a halogen group, and examples thereof include ethylthioxanthone, methylthioxanthone, and chlorothioxanthone. Anthraquinones refer to anthraquinone and derivatives substituted with alkyl groups, phenyl groups, halogen groups, and the like. The addition amount of the hydrogen abstraction type photopolymerization initiator is preferably 0.1 wt% or more and 10 wt% or less, more preferably 0.5 wt% or more and 5 wt% or less of the total amount of the photosensitive resin composition. When the addition amount is within this range, when the liquid photosensitive resin composition is cured in the air, the curability of the cured product surface can be sufficiently secured, and the light resistance can be secured.

  The decay type photopolymerization initiator refers to a compound that undergoes a cleavage reaction in the molecule after light absorption to generate an active radical, and is not particularly limited. Specific examples include benzoin alkyl ethers, 2,2-dialkoxy-2-phenylacetophenones, acetophenones, acyloxime esters, azo compounds, organic isotope compounds, diketones, and the like. It is preferable to use at least one compound selected from the group consisting of: Examples of benzoin alkyl ethers include compounds described in benzoin isopropyl ether, benzoin isobutyl ether, and “photosensitive polymer” (Kodansha, 1977, page 228). Examples of 2,2-dialkoxy-2-phenylacetophenones include 2,2-dimethoxy-2-phenylacetophenone and 2,2-diethoxy-2-phenylacetophenone. Examples of acetophenones include acetophenone, trichloroacetophenone, 1-hydroxycyclohexylphenylacetophenone, 2,2-diethoxyacetophenone, and the like. Examples of acyl oxime esters include 1-phenyl-1,2-propanedione-2- (o-benzoyl) oxime. Examples of the azo compound include azobisisobutyronitrile, diazonium compound, and tetrazene compound. Examples of organic sulfur compounds include aromatic thiols, mono- and disulfides, thiuram sulfides, dithiocarbamates, S-acyl dithiocarbamates, thiosulfonates, sulfoxides, sulfinates, dithiocarbonates, and the like. Examples of diketones include benzyl and methylbenzoyl formate. The addition amount of the collapsible photopolymerization initiator is preferably 0.1 wt% or more and 10 wt% or less, more preferably 0.3 wt% or more and 3 wt% or less of the total amount of the photosensitive resin composition. When the addition amount is within this range, when the photosensitive resin composition is photocured in the air, the curability inside the cured product can be sufficiently secured.

  In particular, in the case of a radical polymerization type photosensitive resin composition to be photocured in an atmosphere having an oxygen concentration of 5 vol% or more, a combination of a hydrogen abstraction type photopolymerization initiator and a decay type photopolymerization initiator as a photopolymerization initiator. Alternatively, it is preferable to use a photopolymerization initiator having both a site functioning as a hydrogen abstraction type photopolymerization initiator and a site functioning as a decay type photopolymerization initiator in the same molecule. In an atmosphere containing 5 vol% or more of oxygen, there is a problem that the curing in the vicinity of the surface is particularly insufficient because of the inhibition of curing by oxygen. Therefore, in order to prevent curing inhibition, a special device such as an inert gas atmosphere, an atmosphere in water, or the surface of the photosensitive resin composition is covered with a light-transmitting film and oxygen is blocked, It is necessary to attach a special mechanism to the exposure apparatus. In particular, when forming a cylindrical photosensitive resin cured product layer, an extremely complicated mechanism is required.

  Hydrogen in which the resin (b) or the organic compound (c) is directly bonded to a sulfur atom such as a thiol, which is a compound having a hydrogen atom present in the α position with respect to an oxygen atom or a nitrogen atom present in the molecular chain. The compound having atoms is preferably contained at least 20 wt% or more of the total amount of the photosensitive resin composition. More preferably, it is 40 wt% or more. Examples of the atomic group derived from the oxygen atom include alcohols, ethers, esters, and carbonates, and examples of the atomic group derived from the nitrogen atom include urethane, urea, and amide. Although the detailed reaction mechanism is not clear, excitation of the hydrogen abstraction type photopolymerization initiator is performed by using hydrogen directly bonded to the α-position hydrogen or sulfur atom present in the molecule of the resin (b) or the organic compound (c). This is probably because radical species are generated by the reaction in which the triplet state is efficiently extracted, and the generated radical species contribute to the crosslinking reaction. Many hydrogen abstraction type photopolymerization initiators exhibit strong light absorption in the wavelength range of 200 nm to 300 nm, and these lights are attenuated rapidly inside the photosensitive resin composition layer. It is estimated to be.

  In addition, a polymerization inhibitor, an ultraviolet absorber, a dye, a pigment, a lubricant, a surfactant, a plasticizer, a fragrance, and the like can be added to the resin composition of the present invention according to the purpose and purpose.

  Inorganic fine particles or inorganic organic composite fine particles can be added to the resin composition of the present invention. A porous body is particularly preferable. A porous material is a fine particle with fine pores or fine voids in the particle, and heat is applied to the surface of the cured resin layer in the surface adjustment process, so it occurs in the cutting, grinding, and polishing processes. This is effective in absorbing and removing viscous liquid residue, and also has an anti-tacking effect on the surface.

  As a method for molding the resin composition of the present invention into a cylindrical shape, an existing resin molding method can be used. For example, a doctor blade and a coating method, a die extrusion method, a spray coating method, a gravure coating method, a roll coating method and the like can be exemplified. Moreover, the method etc. which carry out the calendar process of the apply | coated resin composition layer with a roll, and match | combine thickness can be taken. In that case, it is also possible to perform the molding while heating the resin composition within a range that does not deteriorate the performance.

  By performing physical and chemical treatment on the surface of the metal hollow cylinder used in the present invention, the adhesiveness with the photosensitive resin composition layer or the adhesive layer can be improved. Examples of the physical treatment method include a sand blast method, a wet blast method for injecting a liquid containing fine particles, a corona discharge treatment method, a plasma treatment method, an ultraviolet ray or vacuum ultraviolet ray irradiation method, and the like. The chemical treatment method includes a strong acid / strong alkali treatment method, an oxidant treatment method, a coupling agent treatment method, and the like.

  The photosensitive resin composition (a) formed into a cylindrical shape is cured by light irradiation to form a cured photosensitive resin (α). Further, it can be cured by light irradiation while being formed into a cylindrical shape. Examples of the light source used for curing include a high pressure mercury lamp, an ultrahigh pressure mercury lamp, an ultraviolet fluorescent lamp, a germicidal lamp, a carbon arc lamp, a xenon lamp, and a metal halide lamp. The light irradiated on the photosensitive resin composition layer preferably has light having a wavelength of 200 nm to 300 nm. In particular, since many hydrogen abstraction type photopolymerization initiators have strong light absorption in this wavelength region, when having light with a wavelength of 200 nm to 300 nm, sufficient curability of the surface of the cured photosensitive resin layer is ensured. be able to. The light source used for curing may be one type, but the curability of the resin may be improved by curing using two or more types of light sources having different wavelengths, so two or more types of light sources may be used. There is no problem.

  The cured resin layer made of the cured resin of the present invention preferably has no seam. When the resin composition is applied on a metal cylinder by a non-contact method such as a spray method, the thickness of the resin composition is increased by spraying the resin composition while rotating the metal cylinder, thereby seamless layer. Can be formed. In addition, when it is applied onto a metal cylinder by a contact method such as the doctor blade method, die extrusion method, roll coating method, or gravure coating method, the part that finally comes into contact remains, and unevenness may occur in that part. There is sex. In such a case, it is desirable to adjust the surface by a method such as cutting, grinding, or polishing after the resin composition is cured.

  Moreover, since it is necessary to harden after apply | coating a resin composition, in order to hold | maintain a cylindrical shape, it is preferable to use the photosensitive resin composition which can be hardened in a short time.

  On the surface of the hollow cylindrical support for a printing substrate according to the present invention, a photosensitive resin composition layer (β) or a cured photosensitive resin layer (γ) capable of forming an uneven pattern on the surface is laminated, or on the surface. A hollow cylindrical printing substrate can be obtained by laminating a cured photosensitive resin layer (δ) on which an uneven pattern is formed. Here, the photosensitive resin layer (β) capable of forming a concavo-convex pattern on the surface refers to a photosensitive resin layer capable of forming a concavo-convex pattern on the surface using photolithography. Moreover, the photosensitive resin hardened material layer ((gamma)) which can form an uneven | corrugated pattern on the surface refers to the photosensitive resin hardened | cured material layer which can form an uneven | corrugated pattern on the surface by laser engraving by photocuring. The photosensitive resin composition layer (β) capable of forming a concavo-convex pattern on the surface includes a photosensitive resin layer capable of forming a concavo-convex pattern on the surface using photolithography. For example, the composition which mixed the monomer component, the plasticizer component, the photoinitiator, etc. in thermoplastic elastomers, such as styrene-butadiene-styrene (SBS) and styrene-isoprene-styrene (SIS), can be mentioned. Such a composition can be molded into a sheet and laminated on a hollow cylindrical support as a photosensitive resin layer. In addition, after the exposure process using an exposure mask, a pattern is formed on the surface through a development process in which an uncured part is developed and removed with a developer, or a thermal development process in which the uncured part is heated and melted with a nonwoven fabric and absorbed and removed. be able to. In this case, a photosensitive resin original plate formed in a sheet shape can be wound around and attached to the surface of the cylindrical support. At this time, a step of welding the end portion of the sheet-like photosensitive resin layer laminated on the hollow cylindrical support to remove the seam may be performed. In addition, as a photosensitive resin cured product layer capable of forming a concavo-convex pattern on the surface, the photosensitive resin layer obtained by molding the photosensitive resin composition containing the thermoplastic elastomer described above into a sheet shape is photocured in the form of a sheet. The sheet-shaped photosensitive resin cured product layer obtained by laminating is laminated on the hollow cylindrical support, or the sheet-shaped photosensitive resin layer is laminated on the hollow cylindrical print support and then photocured and photosensitized. The cured resin layer can be obtained and can be used as a printing layer in the printing process. In the case of forming into a cylindrical shape in an uncured state, the seam can be removed by welding the end portions of the sheet. Furthermore, as a useful material for forming a cured photosensitive resin layer capable of forming a concavo-convex pattern on the surface using a laser engraving method, for example, a prepolymer such as unsaturated polyurethane or unsaturated polyester, a monomer component or a photopolymerization initiator And a photosensitive resin composition which is liquid at 20 ° C. and is composed of a composition in which is mixed. The liquid photosensitive resin composition mentioned here is applied on a cylindrical printing substrate and then used as a cured photosensitive resin layer obtained by curing with light, and a pattern is formed on the surface by laser engraving. Printed layer.

  The photosensitive resin cured product layer (δ) having a concavo-convex pattern formed on the surface refers to a sheet-shaped photosensitive resin cured product layer having a concavo-convex pattern formed on the surface by photolithography, laser engraving, or the like. . For example, a photosensitive resin cured product layer formed by forming a photosensitive resin composition comprising the thermoplastic elastomer as a main component into a sheet shape, and forming a pattern on the surface through exposure and development processes in a sheet state, a sheet shape The printed layer can be wound around a hollow cylindrical support and pasted. Furthermore, the photosensitive resin hardened | cured material layer which formed the pattern in the surface by the laser engraving method of the photosensitive resin hardened | cured material shape | molded in the sheet form can be mentioned. These photosensitive resin cured product layers can be laminated on a hollow cylindrical support and used as a printing layer in the printing process.

  In the present invention, a cushion layer made of an elastomer can be formed below the print layer. The cushion layer is preferably an elastomer layer having a Shore A hardness of 10 to 70 degrees. When the Shore A hardness is 10 degrees or more, the print quality can be ensured because the film is appropriately deformed. Moreover, if it is 70 degrees or less, it can play the role as a cushion layer.

  The cushion layer is not particularly limited, and any cushion layer may be used as long as it has rubber elasticity, such as a thermoplastic elastomer, a photocurable elastomer, and a thermosetting elastomer. It may be a porous elastomer layer having fine pores. In particular, from the viewpoint of processability to a sheet-like or cylindrical printing plate, it is simple and more preferable to use a liquid photosensitive resin composition that is cured by light and to use a material that becomes elastomer after curing.

  Specific examples of the thermoplastic elastomer used for the cushion layer include SBS (polystyrene-polybutadiene-polystyrene), SIS (polystyrene-polyisoprene-polystyrene), SEBS (polystyrene-polyethylene / polybutylene-polystyrene), which are styrenic thermoplastic elastomers, and the like. Olefin-based thermoplastic elastomer, urethane-based thermoplastic elastomer, ester-based thermoplastic elastomer, amide-based thermoplastic elastomer, silicon-based thermoplastic elastomer, fluorine-based thermoplastic elastomer, and the like.

  Examples of the photocurable elastomer include those obtained by mixing a photopolymerizable monomer, a plasticizer, a photopolymerization initiator, and the like with the thermoplastic elastomer, and a liquid composition obtained by mixing a photopolymerizable monomer, a photopolymerization initiator, etc. with a plastomer resin. Can be mentioned. In the present invention, unlike the design concept of the photosensitive resin composition, in which the function of forming a fine pattern is an important element, it is not necessary to form a fine pattern using light, and by curing by overall exposure, Since it is sufficient to ensure a certain level of mechanical strength, the degree of freedom in selecting a material is extremely high.

  Moreover, non-sulfur cross-linked rubbers such as sulfur cross-linked rubber, organic peroxide, phenol resin initial condensate, quinone dioxime, metal oxide, and thiourea can also be used. Furthermore, it is also possible to use an elastomer that has been three-dimensionally crosslinked using a curing agent that reacts with a telechelic liquid rubber.

  The printing machine used when applying ink on the substrate to be printed using the hollow cylindrical printing substrate according to the present invention is particularly limited as long as it is a type of printing machine capable of printing using a resin relief plate. In addition, a commercially available flexographic printing machine, dry offset printing machine, liquid crystal alignment film printing machine, and the like can be given. Films for printing in roll-to-roll form, printing machines for printing on paper, printing machines for printing on sheet-like substrates, printing machines for printing on curved surfaces such as cans are commercially available . A sleeve-compatible printing machine that uses a hollow cylindrical printing substrate mounted on an air cylinder may also be used.

  It is preferable that a linear convex portion exists in the welded portion inside the metal hollow cylinder produced by welding both ends of the metal sheet. It is preferable to use this linear convex portion as an alignment portion when the hollow cylindrical printing substrate is mounted on a plate cylinder of a printing press. Therefore, it is preferable that the surface of the air cylinder used as the plate cylinder has a linear recess at least partially from the end in the longitudinal direction of the air cylinder. By fitting a convex portion existing inside the metal hollow cylinder into the concave portion, it can be used as a reference for alignment. By this work, the position adjustment work can be greatly simplified by performing a slight position correction, and the time required for the work can be greatly shortened.

  Moreover, in this invention, the method of mounting | wearing the cylinder of a printing machine with the above-mentioned hollow cylindrical printing base material is provided. In the method according to the present invention, a linear recess is formed in the major axis direction of the cylinder on the surface of the cylinder, and is present in the innermost hollow metal cylindrical support of the hollow cylindrical printing substrate. The joint portion welded in a straight line is fitted into a recess formed on the cylinder surface and used as a reference for alignment. Furthermore, in the case where the cylinder of the printing press is an air cylinder having micro holes for ejecting air, the method according to the present invention is used in a laser engraving process or a printing process. In addition, in the method according to the present invention, it is preferable that the aforementioned hollow cylindrical printing substrate is used in flexographic printing, dry offset printing or letter press printing.

  The present invention will be described in more detail with reference to the following examples and comparative examples of the present invention, but these are illustrative, and the present invention is not limited to the following examples. Those skilled in the art can implement the present invention by making various modifications to the embodiments shown below, and such modifications are included in the scope of the claims of the present application.

(1) Measurement of number average molecular weight The number average molecular weight of the resin (b) was determined by conversion to polystyrene having a known molecular weight using a gel permeation chromatography method (GPC method). Using a high-speed GPC device (HLC-8020 manufactured by Tosoh Corporation, Japan) and a polystyrene packed column (trademark, TSKgel GMHXL, manufactured by Tosoh Corporation, Japan), the measurement was performed with tetrahydrofuran (THF). The column temperature was set to 40 ° C. As a sample to be injected into the GPC apparatus, a THF solution having a resin concentration of 1 wt% was prepared to have an injection amount of 10 μl. As a detector, an ultraviolet absorption detector was used. The resin (α) used in the examples or comparative examples of the present invention had a polydispersity (Mw / Mn) determined by the GPC method greater than 1.1. Therefore, the number average molecular weight Mn determined by the GPC method was Adopted.

[Example 1]
(Manufacture of metal hollow cylinders)
A 0.15-mm-thick tin (iron surface galvanized) sheet was cut to a length of 499 mm and a width of 200 mm, and formed into a cylindrical shape with a circumference of 500 mm, and a carbon dioxide laser welding machine was used. And both ends were welded. At this time, a metal mold having a linear shape with a depth of 1 mm and a width of 1 mm and a semicircular groove formed therein is installed under the tin sheet of the welded portion. The tinplate was finely adjusted so as to be formed on the surface, and the laser welding was performed.
A linear convex portion corresponding to the shape of the groove was formed inside the tin hollow cylinder thus formed. The width of the convex part was about 1 mm, and the height was about 1 mm. The welded portion on the outside of the tin hollow cylinder was swelled in a linear shape of about 100 μm.

(Production of resin (b))
In a 2 L separable flask equipped with a thermometer and a stirrer, 212 parts by weight of diethylene glycol, 152 parts by weight of propylene glycol, 90 parts by weight of 1,4-butanediol, 511 parts by weight of adipic acid, 87 parts by weight of fumaric acid, tetrahydrophthalic anhydride 127 parts by weight and 1.2 parts by weight of p-methoxyphenol were reacted in a nitrogen atmosphere at normal pressure and 230 ° C. for 4 hours, and then further reacted at 100 mmHg under reduced pressure for 4 hours to obtain an unsaturated polyester having an acid value of 23. Obtained.
560 parts by weight of this unsaturated polyester, 33.6 parts by weight of hexamethylene diisocyanate and 0.6 parts by weight of 2,6-di-tert-butyl-4-methylphenol were mixed and reacted at 80 ° C. for 4 hours, and then this reaction was performed. To the product, 43.2 parts by weight of hydroxypropyl methacrylate and 0.2 part by weight of dibutyltin tin dilaurate were added, and further reacted at 80 ° C. for 2 hours to obtain unsaturated polyester urethane. The polystyrene equivalent number average molecular weight of this product by GPC was 7000.

(Adjustment of photosensitive resin composition (a))
With respect to 66.8 parts by weight of the unsaturated polyester urethane produced as described above, 16.63 parts by weight of diethylene glycol dimethacrylate, 8.28 parts by weight of diacetone acrylamide, and 8.28 parts by weight of diethylene glycol dimethacrylate as the organic compound (c). , 0.6 part by weight of 2,2-dimethoxy-2-phenylacetophenone as a photopolymerization initiator, 1 part by weight of benzophenone, 0.05 part by weight of 2,6-di-t-butyl-4-methylphenol as a polymerization inhibitor Were mixed to obtain a photosensitive resin composition (a).

(Manufacture of hollow cylindrical support for printing substrate)
A photosensitive resin composition (A) having a thickness of about 1 mm is applied to the outer surface of a tin hollow cylinder using a doctor blade, and irradiated with ultraviolet light from a metal halide lamp (Fusion, USA). A cured cured resin was obtained. Thereafter, the surface of the cured photosensitive resin was slightly ground and polished to form a 1 mm thick cured photosensitive resin layer with no joints.

(Cushion layer formation)
On the obtained hollow cylindrical support for printing equipment, a cushion tape (trade name “1820”, manufactured by 3M, USA) with a double-sided adhesive layer on both sides of the cushion was attached.

(Manufacture of photosensitive resin composition for laser engraving printing master)
Into a 1 L separable flask equipped with a thermometer and a stirrer, 100 parts by weight of a trademark “PCDL L4672” (number average molecular weight 1990, OH number 56.4), which is a polycarbonate diol manufactured by Asahi Kasei Chemicals Corporation, and 6. After adding 9 parts by weight and reacting at 80 ° C. for 3 hours under heating, 3.3 parts by weight of 2-methacryloyloxyisocyanate was added and further reacted for 3 hours to obtain an unsaturated polyurethane. The polystyrene-reduced number average molecular weight of this product by GPC was about 10,000.
With respect to 100 parts by weight of the unsaturated polyurethane produced as described above, 25 parts by weight of benzyl methacrylate, 19 parts by weight of cyclomethacrylate, 6 parts by weight of butoxydiethylene glycol methacrylate as an organic compound (c), and 2,2-dimethoxy as a photopolymerization initiator -2-Phenylacetophenone 0.6 part by weight, benzophenone 1 part by weight, inorganic porous material C-1504 (manufactured by Fuji Sicilian Chemical Co., Ltd., porous fine powder silica, trademark “Cyrossphere C-1504”) Number average particle diameter 4.5 μm, specific surface area 520 m ² / g, average pore diameter 12 nm, pore volume 1.5 ml / g, loss on ignition 2.5 wt%, oil absorption 290 ml / 100 g) 5 parts by weight, polymerization inhibitor 2,6-di-tert-butyl-4-methylphenol 0.05 parts by weight as Resin composition (b) was obtained.

(Manufacture of cylindrical printing originals for laser engraving)
On the cushion formed as described above, a photosensitive resin composition (A) is applied to a thickness of about 3 mm using a doctor blade, and irradiated with ultraviolet rays from the metal halide lamp to obtain a cured photosensitive resin. It was. The surface of the obtained photosensitive resin cured product was ground and polished to obtain a printing original plate having a thickness of 2.8 mm.

(Manufacture of laser engraving printing plates)
A printing plate having a halftone dot pattern was formed on the surface of the printing original plate for laser engraving using a laser engraving machine (trade name “ZED-mini-1000” manufactured by ZED, UK). The depth was set to 0.5 mm. A hollow cylindrical printing plate prepared on an air cylinder of a laser engraving machine was mounted. At this time, a concave portion corresponding to the linear convex portion formed on the inner surface of the welded portion of the tin hollow cylinder was formed on the air cylinder surface, and alignment was performed so that the concave and convex portions of the welded portion were fitted. Laser engraving was performed using the center of the recess on the surface of the air cylinder as a reference.

(Print evaluation)
The produced hollow cylindrical printing plate was mounted on an air cylinder of a flexographic printing machine. At this time, a concave portion corresponding to the linear convex portion on the inner side surface of the welded portion of the tin hollow cylinder was formed on the surface of the air cylinder, and alignment was performed so that the concave and convex portions of the welded portion were fitted. The alignment time was less than 1 minute.

[Comparative Example 1]
As a metal hollow cylinder, a seamless sleeve having a thickness of 125 μm prepared by nickel plating was prepared. There are no protrusions on the inner surface of the metal hollow cylinder. A laser engraving printing plate was produced in the same manner as in Example 1 except for the metal hollow cylinder.
It was mounted on the air cylinder, which is the plate cylinder of the printing press, and aligned, but it took several minutes.

[Comparative Example 2]
The tin hollow cylinder used in Example 1 was repeatedly mounted / removed 5 times on the air cylinder, but a dimple was formed on the surface during the handling operation at the time of mounting / removing, and recovery was not possible.

  The hollow cylindrical support for a printing substrate according to the present invention is suitable as a hollow cylindrical support for a printing substrate used in a printing process.

FIG. 1 shows a schematic view of a hollow cylindrical support for a printing substrate according to the present invention, and FIG. 1 (A) shows a schematic perspective view of the hollow cylindrical support for a printing substrate. 1 (B) and 1 (C) each show an enlarged schematic cross-sectional view of a part of the support.

Explanation of symbols

10: hollow cylindrical support for printing substrate, 12: metal sheet, 14: welded part, 16: convex part, 18: cured resin layer

Claims (13)

A hollow cylindrical support for a printing substrate produced by welding both ends of a metal sheet formed into a cylindrical shape,
A cured resin layer having a thickness of 50 μm or more and 20 mm or less is formed on at least a part of the welded part of the hollow metal cylinder and has a convex part on at least a part of the welded part. A hollow cylindrical support for a printing substrate, which is characterized in that   The thickness of the metal sheet is 10 μm or more and 500 μm or less, and a linear protrusion having a width of 10 μm or more and 2 mm or less and a thickness of 5 mm or less exists in the welded portion. 2. A hollow cylindrical support for a printing substrate according to 1.   The metal is a single metal selected from the group consisting of iron, aluminum, nickel, chromium, copper, titanium, zinc, tungsten, and tantalum, or an alloy, laminate, or joint including the above-mentioned type of metal. The hollow cylindrical support for a printing substrate according to claim 1 or 2, characterized in that:   The method for welding both ends of the metal sheet is at least one selected from the group consisting of laser welding, arc welding, electron beam welding, electroslag welding, ultrasonic welding, and resistance welding. The hollow cylindrical support for a printing substrate according to any one of claims 1 to 3, wherein the support is a method.   The hollow cylindrical support for a printing substrate according to any one of claims 1 to 4, wherein the cured resin layer does not have a seam.   The hollow cylinder for a printing substrate according to any one of claims 1 to 5, wherein at least one of the cured resin layers is formed of a cured photosensitive resin (α). Support.   7. The hollow cylindrical support for a printing substrate according to claim 6, wherein the cured photosensitive resin (α) is obtained by photocuring a liquid photosensitive resin composition (a) at 20 ° C. body.   The hollow cylindrical support for a printing substrate according to any one of claims 1 to 7, wherein the cured resin layer has a Shore D hardness of 5 degrees to 100 degrees.   A photosensitive resin composition layer (β) capable of forming a concavo-convex pattern on the surface thereof on the hollow cylindrical support for a printing substrate according to any one of claims 1 to 8, and a cured photosensitive resin layer A hollow cylindrical printing substrate, wherein (γ) is laminated, or a photosensitive resin cured product layer (δ) having a concavo-convex pattern formed on the surface thereof is laminated.   The hollow cylindrical printing substrate according to claim 9, wherein the method for forming a concavo-convex pattern on the surface is a photoengraving method or a laser engraving method. A method of mounting the hollow cylindrical printing substrate according to claim 9 on a cylinder of a printing press,
On the surface of the cylinder, a linear concave portion is formed in the major axis direction of the cylinder, and is welded in a linear shape present in the innermost hollow metal cylindrical support of the hollow cylindrical printing substrate. A method for forming a hollow cylindrical printing substrate, wherein the joining portion is fitted into a concave portion formed on the cylinder surface and used as a reference for alignment.   The method of a hollow cylindrical printing substrate according to claim 11, wherein the cylinder is an air cylinder having fine holes for ejecting air, and is used in a laser engraving process or a printing process.   The method of the hollow cylindrical printing base material characterized by using the hollow cylindrical printing base material in any one of Claim 9 or 10 by flexographic printing, dry offset printing, or letterpress printing.

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