JP2006043909A - Printing plate making device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing plate making device which can easily perform the making of a printing plate/its protection and the deposition/curing of an ultraviolet-curable resin and a treatment to make a non-image part hydrophilic. <P>SOLUTION: This printing plate making device comprises the following components: a direct drawing-type original printing plate with a porous layer; a conveyance means which conveys the ultraviolet-curable resin with not more than 90° contact angle to the porous layer and the direct drawing-type original printing plate; a liquid droplet discharge means which deposits the ultraviolet-curable resin on the direct drawing-type original printing plate; a carriage means which transfers the liquid droplet discharge means perpendicularly to the transfer direction of the direct drawing-type original printing plate; a curing means which cures the ultraviolet-curable resin deposited on the direct drawing-type original printing plate by irradiating the resin with an ultraviolet light; a conveyance means which relatively transfers the direct drawing-type original printing plate and the carriage means; and a hydrophilic nature-imparting treatment means which makes only a non-image part of the direct drawing-type original printing plate where an image pattern which is formed by the liquid droplet discharge means using the ultraviolet-durable resin and cured by the curing means, is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plate making apparatus for making a printing plate by depositing an image forming resin on a surface of a direct drawing printing original plate according to a desired image pattern.

  Due to recent advances in computer technology, the digitization of information in the printing field has rapidly progressed, and a plate making method capable of producing a lithographic printing plate from digital information output from a computer or the like without using a plate making film has attracted attention. Yes. As such a plate making method, a plate in which a photosensitive resin layer (image forming layer) is uniformly coated on the surface of an aluminum support called a PS plate is used. This PS plate (printing master) is exposed to a laser in accordance with a desired image pattern, a drawing process for selectively curing a portion corresponding to an image area, a development process for developing with a developer, a developer or unnecessary The plate is made through many steps such as a rinsing process for washing away the photosensitive resin, a gum treatment process for applying a liquid containing gum arabic and starch derivatives to protect the surface of the PS plate, and a drying process. It is general (see, for example, Patent Document 1).

  On the other hand, a technique for forming a printing plate by forming an image portion by an ink jet method using a fat-sensitive image forming ink containing a photopolymerization material is known (for example, Patent Document 2, Patent Document). 3, see Patent Literature 4 and Patent Literature 5).

Inkjet printing plate preparation eliminates the need for development and rinsing steps, so there is no need for management, storage and processing of developer and drainage, and no complicated optical system is required, thus simplifying the apparatus. It is possible to reduce the plate-making cost.
Japanese Patent Laid-Open No. 10-83082 JP 2001-219527 A JP-A-7-304278 JP-A-8-324145 Japanese Patent Laid-Open No. 9-24599

  However, in the techniques described in Patent Document 3, Patent Document 4 and Patent Document 5, a printing plate used for a conventional lithographic printing plate is commonly used, and the surface of the printing plate has hydrophilicity and water retention. Various treatments such as graining, anodizing, and hydrophilization are performed to improve the quality. This hydrophilic grained surface is insufficient in liquid absorption, so that the image forming ink adhered to the surface of the printing plate cannot be sufficiently prevented from spreading, and the resolution decreases due to bleeding of the image forming ink. Is a problem. Further, the adhesion force is weak because only the image forming ink is adhered to the surface. An ink composition having a very high surface tension is used as the image forming ink in order to form the image area directly on the surface of the hydrophilic printing plate by the ink jet method while suppressing such bleeding of the image forming ink. However, it is conceivable that the printing ink does not sufficiently deposit on the image area formed by such an ink composition, and as a result, a good printed matter cannot be obtained. Furthermore, the problem that the adhesion of the image forming ink is weak cannot be solved.

  As described above, the surface of the printing plate used in the conventional plate making apparatus has been subjected to hydrophilic treatment, and it is impossible to prevent bleeding of the image forming ink. Further, the adhesive strength is weak and the printing durability cannot be ensured. Have some flaws.

  The present invention has been made in view of such points, and the steps from the production of the printing plate to the protection of the plate surface are simply constituted by three steps of mainly adhesion of the ultraviolet curable resin, curing, and hydrophilic treatment of the non-image portion. An object of the present invention is to provide a plate making apparatus that can be reduced in size because the development process and the accompanying water washing process are not required, and the apparatus has a very simple configuration.

  In order to solve such a problem, in the plate making apparatus according to the present invention, as shown in claim 1, the direct drawing type printing original plate having a porous layer and the contact angle of the direct drawing type printing original plate with respect to the porous layer are 90. Less than a degree of oil-sensitive UV curable resin, a conveying means for conveying the direct-drawing type printing original plate one by one, and one or the image that is made by attaching the ultraviolet curable resin to the direct drawing type printing original plate according to a desired image pattern A droplet discharge means comprising a plurality of nozzles, a carriage means for reciprocating the droplet discharge means across the direct drawing type printing original plate in a direction perpendicular to the moving direction of the direct drawing type printing original plate, and a proximity to the carriage means Curing means provided for irradiating and curing the ultraviolet curable resin attached to the direct drawing type printing original plate by the droplet discharge means, and conveying means for intermittently moving the direct drawing type printing original plate and the carriage means. A hydrophilization treatment means for performing a hydrophilization treatment only on a non-image portion of a direct-drawing printing original plate on which an image pattern formed by a droplet discharge means using an ultraviolet curable resin and cured by a curing means is formed The configuration was as follows.

  According to this, the process from the production of the printing plate to the protection of the printing plate can be mainly composed of three steps of adhesion of UV curable resin, curing, and hydrophilic treatment of the non-image part, and development processing and accompanying water washing treatment are unnecessary. Therefore, the configuration becomes very simple and the apparatus can be downsized. In addition, by setting the contact angle of the UV curable resin to 90 ° or less with respect to the surface of the direct printing type printing original plate, the wettability of the UV curable resin to the surface of the direct drawing type printing original plate is improved. Since UV curable resin enters and cures, strong adhesion is realized, and printing durability during printing can be secured. Furthermore, by performing hydrophilic treatment on the printing original plate on which an image pattern is formed with an ultraviolet curable resin, only the non-image part of the printing original plate becomes hydrophilic, so that dampening water at the time of printing can be maintained well and the porous layer is oxidized. It is possible to reduce the change with time in hydrophilicity.

  In the plate making apparatus, as shown in claim 2, the solvent used for the hydrophilic treatment by the hydrophilic treatment means has a contact angle of 90 degrees or more with respect to the cured ultraviolet curable resin surface. With this configuration, the solvent for the hydrophilization treatment adheres only to the non-image area where the UV curable resin of the direct drawing type printing original plate does not adhere by simply applying the solvent uniformly with the application roller without using any special method, A non-image part can be selectively hydrophilized.

  In the above plate making apparatus, as shown in claim 3, since the attached ultraviolet curable resin is cured immediately after adhesion, the spread of the ultraviolet curable resin over time due to the capillary phenomenon of the surface layer of the printing original plate is greatly reduced. . As a result, the resolution is greatly improved.

  According to the present invention, the process from the production of the printing plate to the protection of the printing plate can be simply constituted mainly with the three steps of adhesion of the ultraviolet curable resin, curing, and hydrophilic treatment of the non-image part, The accompanying water washing process is not necessary, and the apparatus has a very simple configuration and can be miniaturized.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The direct-drawing printing original plate used in the present invention has a structure in which a porous layer is provided on a substrate. FIGS. 1A and 1B are diagrams showing different schematic configurations of the direct drawing type printing original plate used in the present invention. In FIG. 1 (a), a direct drawing type printing original plate 1 has an alumite layer 3 to be a porous layer formed on a base material 2 made of an aluminum sheet by anodizing. Pure aluminum is used as the base material 2 and after removing impurities on the surface, anodization is performed, and the treatment time and treatment solution are selected to control the thickness of the alumite to be 5 to 50 μm. . The alumite layer 3 formed in this way has a large number of pores having a depth close to the thickness of the alumite layer formed in a honeycomb shape. These pores have a diameter of 100 to 500 mm and can absorb and retain liquid by capillary action.

  The other direct-drawing type printing original plate has a two-layer structure as shown in FIG. The direct-drawing type printing original plate 4 is formed by applying a mixture of porous silica particles and alumina or alumina hydrate together with a binder on a sheet-like base material 5 having excellent dimensional stability such as aluminum, PET, or synthetic paper. A porous layer 6 is provided.

  In this configuration, the pores of alumina or alumina hydrate and porous silica themselves, and the gap formed between these particles and the binder have the function of absorbing and holding the ultraviolet curable resin as in the above-described embodiment. In order to produce the direct-drawing type printing original plate 4 of this example, a method of preparing a mixture of porous silica particles and alumina or alumina hydrate and applying the mixture together with a binder to the substrate surface is common. In this case, polyvinyl alcohol is mainly used as the binder material. In addition, various modified polyvinyl alcohols such as cation modified, anion modified, silanol modified, starch derivatives and modified products thereof, cellulose derivatives, styrene-maleic acid copolymers. Etc. can be used alone or in combination as appropriate. As the coating means, various methods such as an air knife coater, a blade coater, a bar coater, a rod coater, a roll coater, a gravure coater, and a size press can be used.

  Furthermore, alumina or hydrated alumina includes porous aluminum oxides having a radius of 30 to 100 mm and hydrates thereof in order to absorb the ultraviolet curable resin and obtain sufficient resolution. As a means for measuring pore physical properties, the pore distribution of the dry solid content of alumina or alumina hydrate can be measured by a nitrogen adsorption method (constant flow method). Alumina or alumina hydrate may be either crystalline or amorphous, and any suitable form such as irregular particles or spherical particles can be used. A gel-like product obtained by using an alumina sol and drying it is particularly suitable. A specific example is coagulated boehmite, which is optimal as a material used in the present invention. In particular, pseudo boehmite sol obtained by drying the sol is preferable.

  As the porous silica particles, those having an average particle diameter of 2 to 50 μm and an average pore diameter of about 80 to 500 mm are preferable in order to absorb the ultraviolet curable resin and obtain a sufficient resolution in the same manner as alumina or alumina hydrate. . The porous silica particles may contain 20% by weight or less of boria, magnesia, zirconia, titania and the like.

  The amount of alumina or alumina hydrate used is suitably about 5 to 50% by weight with respect to the porous silica particles 8. When the amount used is less than the lower limit, the object of the present invention cannot be sufficiently achieved. Conversely, when the amount exceeds the upper limit, the absorption rate is undesirably slowed.

  Furthermore, if the pores of alumina or alumina hydrate and porous silica particles are smaller than the color material of the printing ink, it is possible to prevent the color material of the printing ink from entering the pores during printing and causing printing stains.

  In the above configuration, a porous layer is formed by applying porous silica particles 8 and a mixture of alumina or alumina hydrate together with a binder on a base material to form a porous layer. It is also possible to adopt a configuration in which alumina or a mixture of alumina hydrate and porous silica particles is applied to the substrate.

  Furthermore, the structure which apply | coated only the alumina or the alumina hydrate which has a micropore with a binder is also possible. Needless to say, a porous material having a water-resistant fine pore having a pore diameter of about 80 to 500 mm can be coated on a substrate to form a direct-drawing printing original plate.

  Next, the ultraviolet curable resin used in the present invention will be described in detail. The ultraviolet curable resin used in the present invention is generally called an ultraviolet curable resin (UV resin). The ultraviolet curable resin is composed of a photopolymerizable resin, a photopolymerization initiator, a colorant, an auxiliary agent, and the like. Photopolymerizable resins are classified into high viscosity oligomers and low viscosity oligomers or monomers called reactive diluents. In order to adjust the viscosity of the ultraviolet curable resin, an oligomer having a relatively high viscosity and a reactive diluent composed of monomers having a high boiling point and polyester acrylates having a low viscosity are mixed. Commonly used oligomers include polyester acrylate, epoxy acrylate, and urethane acrylate. The photopolymerization initiator generates radicals by ultraviolet energy, which reacts with a reactive group of a monomer or oligomer to initiate polymerization. Further, a pigment is added as a colorant to facilitate plate inspection after plate making. The pigment has a great influence on the curability of the ultraviolet curable resin because the ultraviolet absorption property changes depending on the hue. Therefore, a pigment that has good visibility and does not lower the curability as much as possible must be selected. Depending on the pigment, the storage stability of the UV curable resin may be hindered and gelation may occur, so care should be taken and other monomer resistance should be taken into consideration.

  As for auxiliary agents, UV curable resins generate radicals under the influence of heat or the like even when UV rays are not present, and may cause a gelation phenomenon called dark reaction. A polymerization inhibitor is used to prevent dark reactions. Added. Other antifoaming agents are also added.

  Further, a necessary amount of a surfactant is added to adjust the contact angle of the ultraviolet curable resin used in the present invention to the porous layer to 90 degrees or less. By adding a surfactant, the contact angle of the ultraviolet curable resin with respect to the surface of the direct-drawing printing original plate is adjusted to 90 ° or less.

  FIG. 2A shows a state in which an ultraviolet curable resin having a contact angle with respect to the surface of the direct drawing printing original plate 1 set to 90 degrees or less is discharged as droplets 7 from the nozzle onto the direct drawing printing original plate 1. The UV curable resin droplet 7 touches the surface of the anodized layer (porous layer) 3 of the direct-drawing type printing original plate 1 so that the contact angle is 90 degrees or less, so that the wettability is good and the porous anodized rapidly due to capillary action. It easily penetrates into the pores of the layer 3 and fills the pores. However, if the contact angle becomes too small (30 degrees or less), the UV curable resin rapidly penetrates into the porous layer, spreads in the surface direction, and causes bleeding. Accordingly, the contact angle of the ultraviolet curable resin with respect to the porous layer is preferably set to 75 to 30 degrees.

  On the other hand, FIG. 2B shows a state in which an ultraviolet curable resin having a contact angle of 90 degrees or more with respect to the surface of the direct-drawing printing original plate 1 is discharged as droplets 8 from the nozzle onto the direct-drawing printing original plate 1. . When the UV curable resin droplet 8 touches the surface of the anodized layer (porous layer) 3 of the direct-drawing type printing original plate 1, the contact angle is 90 degrees or more, so the wettability is poor, and the spherical anodized layer (porous layer) 3 adheres to the surface and cannot enter the pores of the alumite layer (porous layer) 3 by capillary action. In such a state, the ultraviolet curable resin which is cured by being irradiated with the ultraviolet lamp has a weak adhesive force with respect to the direct-drawing type printing original plate and cannot secure printing durability at the time of printing.

  Further, the ultraviolet curable resin used in the present invention needs to be finished to a liquid having a relatively low viscosity in order to be ejected by an ink jet recording head. In order to discharge from the ink jet recording head as a stable droplet without generating satellite or the like, the viscosity of the ultraviolet curable resin needs to be 30 cps or less, preferably 20 to 8 cps. However, the viscosity is not limited to this range when an ultraviolet curable resin and a recording head heating means are used, or when a recording head having a larger output is used.

  The excess UV curable resin that fills the plurality of pores has a high viscosity (optimally 8 to 20 cps), so that it spreads only slightly to the surroundings and rises. Therefore, the ultraviolet curable resin does not spread more than necessary, and high-resolution image formation close to the diameter of the droplet can be performed. In this case, the amount of ink droplets to be ejected differs depending on the resolution. When an image is formed with small dots (that is, high resolution), the amount of ink droplets can be small and the thickness of the anodized layer can be small. However, when an image is formed with large dots (low resolution), a printing original plate having a large ink droplet and a thick alumite layer is used. For example, when an image is formed with a resolution of about 1200 dots / inch, the thickness of the alumite layer is preferably 20 to 25 μm.

  FIG. 3 shows a schematic configuration diagram of the plate making apparatus according to the present invention. The plate making apparatus includes a direct-drawing printing original plate 9 made of an aluminum base, a conveying device made up of a feed roller 10 and a carrying roller 11 for carrying the direct-drawing printing original plate 9, and a direct-drawing printing moved by the carrying device. A linear motor 14 composed of a slider 12 that moves across the original plate 9 and a linear guide 13 provided with a magnet, and a scale 15 that is received even in the vicinity of the linear motor 14 in order to detect position information and movement information of the slider 12. The linear encoder 16 that is also received by the slider 12 and detects the scale 15, the recording head 17 that is provided on the slider 12 and has a plurality of nozzles that discharge ultraviolet curable resin, and the linear motor 14 that has the recording head 17 mounted thereon Parallel and has an irradiation width wider than the recording width of the recording head 17 provided on the downstream side of the linear motor 14. Hydrophilic treatment is applied to the curing device 20 comprising an ultraviolet lamp 18 and a light collecting plate 19 for curing the ultraviolet curable resin discharged to the printing plate precursor 9 and the direct drawing printing plate 9 having been cured. It comprises a hydrophilic treatment device 22 provided with a coating roller 21 for applying the above.

  In the plate making apparatus configured as described above, the direct drawing type printing original plate 9 is inserted into the feed roller 10 with the drawing surface up as preparation for plate making. When the plate making is started, the feed roller 10 and the transport roller 11 are operated to feed the direct drawing type printing original plate 9, and when the front end of the direct drawing type printing original plate 9 passes through the feeding roller 10 and reaches a predetermined position, the feeding roller The conveyance device composed of 10 and the conveyance roller 11 stops. Next, the linear motor 14 operates and the slider 12 moves across the direct drawing type printing original plate 9. When the linear encoder 16 provided on the slider 12 reads the scale 15 and detects that the slider 12 has reached a predetermined position on the direct-drawing printing original plate 9, a raster is printed in units of pages to be printed from the recording head 17 provided on the slider 12. The discharge of the ultraviolet curable resin is started by the rendered drawing signal, and the ultraviolet curable resin is attached to the image line portion to which the printing oil-based ink is attached in the printing process. As the slider 12 of the linear motor 14 moves, the recording head 17 moves from one end to the other end of the direct-drawing printing original plate 9 according to the position information read by the linear encoder 16 and read the scale 15, and the ultraviolet curable resin is sequentially attached. To do. In this way, an ultraviolet curable resin image is formed according to the information designated at the precise position. When the slider 12 moves to the other end of the direct-drawing type printing original plate 9 and the adhesion of the UV curable resin is completed up to a predetermined position, the linear motor 14 reverses and the slider 12 returns to the original position along the linear guide 13. During the operation in which the slider 12 returns to the original position, the recording head 17 does not discharge the ultraviolet curable resin, only the conveying device operates, and the feeding roller 10 and the conveying roller 11 record a new portion of the direct drawing type printing original plate 9. When set under the head 17, the transport device composed of the feed roller 10 and the transport roller 11 stops again. Then, the recording head 17 provided on the slider 12 again moves from one end to the other end of the direct drawing type printing original plate 9 along the linear guide 13 of the linear motor 14, and the ultraviolet curable resin is adhered as in the previous case. In this manner, the ultraviolet curable resin is repeatedly attached by the recording head 17 mounted on the slider 12 while intermittently feeding the direct drawing type printing original plate by the conveying device. When the ultraviolet curable resin is adhered by the recording head 17 and at the same time, the portion of the direct-printing printing original plate 9 to which the ultraviolet curable resin is attached reaches the curing device 20 provided in parallel with the linear motor 14, the ultraviolet lamp 18. Is turned on, and the ultraviolet curable resin adhering to the direct-drawing printing original plate 9 is exposed to the ultraviolet light collected by the light collector 19 and cured.

  Further, when the tip of the direct drawing type printing original plate 9 to which the ultraviolet curable resin is attached reaches the hydrophilization processing device 22, the solution is applied to the surface of the direct drawing type printing original plate by the hydrophilization processing device 22. In the hydrophilic treatment device 22, the solution stored in a liquid tank (not shown) is carried and adhered in the order of the surface of the application roller 21 and the surface of the direct drawing type printing original plate 9 by the rotation of the application roller 21. The solution thinly applied to the direct-drawing type printing original plate 9 is naturally dried or dried by a drying fan or the like (not shown) as necessary to form a thin hydrophilic film. In this hydrophilic treatment apparatus 22, the solution is applied over the entire surface of the direct drawing type printing original plate 9, but the contact angle of the solution with respect to the ultraviolet curable resin is 90 degrees or more. The surface of the portion where the cured resin exists (image portion) is not applied because it repels the solution. In this way, the solvent is selectively applied only to a portion (non-image portion) where the ultraviolet curable resin does not exist in the direct drawing type printing original plate 9. As a result, the image portion of the completed printing plate shows a light-sensitive surface of a cured UV curable resin and oil-based printing ink adheres to it, and the non-image portion becomes a hydrophilic surface of a hydrophilic film and retains dampening water during printing. be able to. When such a series of steps is completed, the production of the printing plate is completed, and the printing plate is set on a normal rotary press, and the necessary number of copies are printed.

  In the plate making apparatus shown in FIG. 3, the ultraviolet curable resin is discharged by the recording head 17 only when the recording head 17 provided in the slider 12 moves in one direction. It is also possible to discharge resin.

  Further, the plate making apparatus shown in FIG. 2 shows a configuration in which only the recording head 17 is attached to the slider 12, but the slider 12 is provided in place of the ultraviolet lamp 18 provided on the downstream side substantially parallel to the linear motor 14. It is also possible to provide a recording head 17 and a small ultraviolet lamp having an irradiation width wider than the nozzle row length of the recording head 17 and curing the ultraviolet curable resin discharged to the direct drawing type printing original plate 9. With this configuration, the ultraviolet curable resin discharged from the recording head 17 attached to the slider 12 is cured by being exposed to the ultraviolet light from the ultraviolet lamp 18 immediately after adhering, so that the resolution due to the spread of the adhering ultraviolet curable resin. Can be further prevented. Further, with this configuration, the slider 12 moves from one end to the other end of the direct-drawing type printing original plate 9 to finish the adhesion and curing of the UV curable resin, and then the recording head is moved back to the original position. Without irradiating the ultraviolet curable resin by 17 and irradiating only the ultraviolet lamp, the portion once cured by the ultraviolet lamp will be cured again, and the ultraviolet curable resin can be cured more reliably, The light quantity of the ultraviolet lamp can be lowered.

  It is also possible to provide small ultraviolet lamps in the moving direction of the recording head 17 and before and after the recording head 17. With this configuration, the ultraviolet curable resin can be discharged by the reciprocating operation of the recording head and the ultraviolet curable resin can be cured by the ultraviolet lamp, and the plate making time can be shortened.

  As is clear from the above description, the present invention includes a direct-drawing printing original plate having a porous layer, and a grease-sensitive UV-curable resin having a contact angle of 90 degrees or less with respect to the porous layer of the direct-drawing printing original plate, A transporting means for transporting the direct-drawing printing original plate one by one; a droplet discharge means comprising one or a plurality of nozzles for forming an image by attaching an ultraviolet curable resin to the direct-drawing printing original plate according to a desired image pattern; Carriage means for reciprocally moving the droplet discharge means across the direct drawing type printing original plate in a direction perpendicular to the moving direction of the direct drawing type printing original plate, and a direct drawing type by the droplet discharging means provided near the carriage means Curing means for irradiating and curing the ultraviolet curable resin attached to the printing original plate with ultraviolet rays, a conveying means for intermittently moving the direct-drawing type printing original plate and the carriage means, and droplet discharge using the ultraviolet curable resin By means It is equipped with a hydrophilic treatment means for performing a hydrophilic treatment only on the non-image portion of the direct-drawing printing original plate on which the image pattern formed and cured by the curing means is formed, and the plate surface is protected from the production of the printing plate. The process up to and including the UV curing resin adhesion, curing, and non-image area hydrophilization treatment can be simply configured, and the development process and the associated water washing process are not required, and the apparatus is very simple. It becomes a structure and can be reduced in size.

  In addition, by setting the contact angle of the UV curable resin to 90 ° or less with respect to the surface of the direct printing type printing original plate, the wettability of the UV curable resin to the surface of the direct drawing type printing original plate is improved. Since UV curable resin enters and cures into the substrate, strong adhesion is realized, and printing durability during printing can be secured.

  Furthermore, by performing hydrophilic treatment on the printing original plate on which an image pattern is formed with an ultraviolet curable resin, only the non-image part of the printing original plate becomes hydrophilic, so that dampening water at the time of printing can be maintained well and the porous layer is oxidized. It is possible to reduce the change with time in hydrophilicity.

  In addition, by adjusting the solvent used for the hydrophilic treatment of the direct-drawing type printing original plate so that the contact angle with respect to the cured ultraviolet curable resin surface is 90 degrees or more, the application roller can be used without any special method. The solvent for the hydrophilization treatment adheres only to the non-image portion of the direct-drawing printing original plate to which the ultraviolet curable resin is not adhered, and the non-image portion can be selectively hydrophilized.

  Furthermore, since the UV curable resin attached by setting the UV lamp close to the recording head is cured immediately after attachment, the spread of the UV curable resin over time due to the capillary phenomenon of the surface layer of the printing original plate is greatly reduced. To do. As a result, the resolution is greatly improved.

The figure which shows schematic structure of the direct drawing type printing original plate used for this invention The figure which shows schematic structure of the other direct drawing type | mold printing original plate used for this invention The figure which shows schematic structure of the plate-making apparatus by this invention

Claims (3)

  A direct-drawing printing original plate having a porous layer, a grease-sensitive ultraviolet curable resin having a contact angle of 90 degrees or less with respect to the porous layer of the direct-drawing printing original plate, and the direct-drawing printing original plate are conveyed one by one Conveying means, droplet ejecting means comprising one or a plurality of nozzles for forming an image by attaching the ultraviolet curable resin to the direct-drawing printing original plate according to a desired image pattern, and the direct-drawing means Carriage means for reciprocating across the direct-drawing printing original plate in a direction perpendicular to the moving direction of the printing original plate, and provided close to the carriage means, and the direct-drawing printing original plate by the droplet discharge means Curing means for irradiating the cured ultraviolet curable resin with ultraviolet rays to cure, conveying means for intermittently moving the direct-drawing printing original plate and the carriage means, and using the ultraviolet curable resin, Droplet discharging means is formed by consisting hydrophilic treatment means for performing hydrophilic treatment only in the non-image portion of the direct drawing type printing plate that an image pattern is cured and is formed by the curing means making apparatus.   2. The plate making apparatus according to claim 1, wherein the hydrophilic treatment means applies a solvent having a contact angle of 90 degrees or more with respect to the cured ultraviolet curable resin surface.   The ultraviolet curing resin is cured immediately after the curing unit is configured integrally with the carriage unit and the ultraviolet curing resin is attached to the direct drawing type printing original plate by the droplet discharge unit. 2. The plate making apparatus according to 1.

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