WO2003080362A1 - Procede permettant de regenerer une plaque d'impression lithographique, dispositif de regeneration, imprimante, plaque d'impression lithographique et procede de fabrication associe, et corps de structure stratifiee et procede de fabrication associe - Google Patents
Procede permettant de regenerer une plaque d'impression lithographique, dispositif de regeneration, imprimante, plaque d'impression lithographique et procede de fabrication associe, et corps de structure stratifiee et procede de fabrication associe Download PDFInfo
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- WO2003080362A1 WO2003080362A1 PCT/JP2003/003361 JP0303361W WO03080362A1 WO 2003080362 A1 WO2003080362 A1 WO 2003080362A1 JP 0303361 W JP0303361 W JP 0303361W WO 03080362 A1 WO03080362 A1 WO 03080362A1
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- WIPO (PCT)
- Prior art keywords
- layer
- photocatalyst
- printing plate
- image
- plate
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
- B41C1/1083—Mechanical aspects of off-press plate preparation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/006—Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
- B41P2227/70—Forming the printing surface directly on the form cylinder
Definitions
- the present invention relates to a method of regenerating a recyclable lithographic printing plate material, a regenerating apparatus, a printing machine, and further, a lithographic printing plate material and a method of producing the same, a layered composition and a method of producing the same.
- a so-called PS plate Presensitized Plate having a hydrophobic image portion formed by curing an anodized aluminum as a hydrophilic non-image portion and curing a photosensitive resin on the surface thereof
- PS plate Presensitized Plate
- the production of a printing plate using this PS plate requires multiple steps, which makes the plate production time-consuming and expensive, thus shortening the printing process time and lowering the printing speed. It is difficult to promote costing. In particular, when printing a small number of copies, this is a factor in printing costs.
- the PS plate requires a developing process with a developer, and it takes time and effort, and the treatment of the developing waste liquid is an important issue from the viewpoint of preventing environmental pollution.
- a film on which an original image has been perforated is generally adhered to the plate surface.
- a method is used in which a plate is made directly from digital data, and the printing plate is a hindrance in advancing the digitization of the printing process. Also, after printing one pattern, the plate had to be changed and the next printing had to be done, and the plate was disposable.
- a laser absorption layer such as a carbon black and the like and a silicon resin layer coated thereon are formed on a PET (polyethylene terephthalate) film, and the laser absorption layer is heated by writing an image with a laser beam.
- a method for writing an image from digital data to a Ps plate directly with light for example, a writing device using a blue laser of 405 nm, a writing device using a micro mirror and a UV lamp, Computer To Plate) is commercially available.
- Japanese Patent Application Laid-Open No. H10-25027 discloses a latent image plate using a titanium oxide photocatalyst, a method of manufacturing a latent image plate, and a printing apparatus having a latent image plate
- Japanese Patent Application Laid-Open No. 11-147360 discloses an offset printing method using a plate material using a photocatalyst, and in any of these, it is possible to use light to activate the photocatalyst for image writing. That is, a method has been proposed in which the plate is regenerated by hydrophobizing the photocatalyst by heat treatment substantially using ultraviolet light.
- JP-A-11-105234 proposes a method of writing an image area by heat mode drawing after hydrophilizing the photocatalyst with active light, that is, ultraviolet light.
- the present inventors can write an image on a printing plate using a writing device using active light or light having a wavelength longer than that of the active light, that is, inactive light, and can be used quickly after printing.
- active light or light having a wavelength longer than that of the active light, that is, inactive light
- the layer containing the photocatalyst is irradiated with activating light mainly in the ultraviolet region to erase the image in the printing plate material.
- activating light mainly in the ultraviolet region to erase the image in the printing plate material.
- the hydrophilic-lipophilic material provided on the surface of the printing plate is a light-to-heat conversion substance
- the history is eliminated by irradiation with heat rays such as infrared rays.
- the hydrophilic / lipophilic material is a metal compound having phototactability (that is, a hydrophilic / lipophilic material similar to the photocatalytic layer of the present invention)
- the history may be resolved by the overall irradiation of the active light.
- a composite material in which a photocatalyst film such as titanium oxide and a photocatalyst including silica is bonded to the surface of a substrate, and a photocatalytic material on the surface of the substrate
- a photocatalytic coating film is made of silicon in which the particles of the present invention are uniformly dispersed.
- This composite has a feature that the surface of the composite maintains good hydrophilicity for a long period of time under weak light in a room or in a dark place when it is made hydrophilic by light excitation.
- Japanese Patent No. 3 07 719 discloses on the surface of a substrate a composition that comprises photocatalytic particles such as titanium oxide, silica fine particles, and a precursor of silica or silicon and is made hydrophilic by light excitation. It is done.
- This composition has features that make it possible to make the surface highly hydrophilic and maintain it.
- a layer containing a photocatalytic oxide such as titanium oxide or the like on the surface of a substrate via an atalyl silicone resin layer or
- a photocatalytic hydrophilic member having a layer containing a photocatalytic oxide layer and silica, or a layer containing a photocatalytic oxide and silicon. This hydrophilic member exhibits high hydrophilicity in response to light excitation, and has a feature that the surface layer is firmly fixed to the substrate.
- the surface of the plate is heated to a temperature of 40 to 200 ° C. and irradiated with active light, It forms an imagewise distribution of hydrophilic and hydrophobic regions. That is, in FIG. 1 of the above-mentioned publication, when the titanium dioxide surface is irradiated with ultraviolet light (active light) having an energy intensity of 1.3 mW / cm 2 , the contact angle to water on the surface is 5 °. As a result of measuring the required time, hydrophilization requiring about 280 seconds at normal temperature (room temperature) is shortened to about 100 seconds at 60 ° C., and further 12
- the temperature is shortened to about 20 seconds at 0 ° C.
- the above-mentioned Gazette also by utilizing the temperature effect can hydrophilization speed is increased is disclosed, as a substance having a photocatalytic activity in this publication, T i 0 2, RT I_ ⁇ 3, AB 2 _ x C x D 3 _ x E x O 10 , S n O 2, Z r 2 2 , B i 2 0 3 , Z n O and F e O x are disclosed, and further, the photocatalytic ability
- a heat insulating layer is provided between the layer having the and the support.
- a bonding material selected from organic polymeric materials and inorganic sol-gel converting materials is disclosed.
- the plate surface temperature increased when the image was written with actinic light having an illuminance sufficient to obtain the image writing speed.
- the photocatalytic reaction is not necessarily carried out by the activation light irradiation under heating. It is sure that the hydrophilization function of the photocatalyst is not enhanced, but rather that the hydrophilization function of the photocatalyst may be reduced.
- the present invention has been made in view of the above problems, and enables the plate material to be regenerated and used repeatedly, and also to shorten the plate regeneration time, in particular, to irradiate the image formed by the organic compound with active light. It is an object of the present invention to provide a method of regenerating a lithographic printing plate material, a regenerating apparatus, and a printing machine, in which the time for decomposing and removing below can be shortened.
- the present invention takes the following measures in order to solve the above-mentioned problems.
- a photocatalyst layer comprising a photocatalyst exhibiting hydrophilicity in response to an active light having energy higher than the band gap energy is provided on the surface of the substrate;
- a method of regenerating a lithographic printing plate comprising: reusing a lithographic printing plate having a hydrophobic image-forming portion having an ink-receptive property on the surface of the lithographic printing plate material; The surface of the photocatalytic layer from which the ink has been removed by the ink removing step, the active light is irradiated, and the surface of the photocatalytic layer is heated.
- the surface of the plate of the printing plate is irradiated with the activation light of the photocatalyst to decompose the hydrophobic image on the surface of the photocatalyst layer, and at the same time, the surface of the photocatalyst layer is converted to hydrophilic.
- the decomposition of the image area is promoted by heating the surface of the photocatalyst layer at this time.
- the ink removing step the ink adhering to the surface of the printing plate is removed, and in the image history erasing step, the surface of the photocatalyst layer of the printing plate from which the ink has been removed in the ink removing step is activated. While irradiating the light, the entire surface of the photocatalytic layer is made hydrophilic by heating the surface of the photocatalytic layer to erase the image history on the surface of the photocatalytic layer, and in the organic compound supply step, the image history in the image history erasing step.
- the plate material can be regenerated and used repeatedly, and the amount of the plate material discarded after use can be significantly reduced, and the cost for the plate material can be reduced. It can be reduced.
- by heating the surface of the photocatalytic layer under irradiation with active light it is possible to erase the history of the plate in a short time, and to shorten the plate regeneration time.
- the organic compound supplying step a property of being decomposed by the action of the photocatalyst when irradiated with the active light, and reacting or Z or interacting with the surface of the photocatalyst layer to hydrophobize the surface of the photocatalyst layer It is preferable to supply an organic compound having properties to the surface of the photocatalyst layer.
- the organic compound supply step a property of being decomposed by the action of the photocatalyst when irradiated with the active light, and melting by heating to form a film, and a reaction and / or interaction with the surface of the photocatalyst layer
- the heating method it is preferable to carry out a heat treatment by irradiating with light having energy lower than the pand gap energy of the photocatalyst, that is, inert light.
- this "inert light” include infrared rays.
- the heating method may be another configuration, for example, direct heating of the organic compound coated surface with a thermal head.
- the surface of the photocatalyst layer is irradiated with, for example, inert light, and the organic compound is melted and fixed on the surface of the photocatalyst layer to make it hydrophobic, thereby writing the hydrophobic area. It becomes possible. Then, at the stage immediately after the start of printing, the organic compound in the non-image area is removed from the surface of the photocatalytic layer by the adhesion of the ink and the cleaning effect of z or dampening water. That is, the surface of the hydrophilic photocatalyst layer is exposed as a non-image area.
- a hydrophilic portion (non-image portion) and a hydrophobic portion (image portion) can be formed on the surface of the photocatalyst layer (surface of the printing plate)
- the surface of the photocatalyst layer It is preferable to heat to a temperature of at least 50.degree. C. and not more than 200.degree. This accelerates the decomposition reaction of the organic compound by the photocatalytic action to erase the plate history in a short time. Can reduce the plate reproduction time.
- the heating in the above-mentioned image history erasing step be a hot air flow to the surface of the photocatalyst layer.
- light irradiation to the surface of the photocatalyst layer is preferable.
- the active light is preferably light having a wavelength of 600 nm or less.
- Photocatalysis can be exhibited in the photocatalyst layer using light having a wavelength of less than or equal to visible light.
- the photocatalyst is preferably a titanium oxide photocatalyst or a visible light responsive titanium oxide photocatalyst.
- visible light responsive titanium oxide photocatalyst titanium oxide photocatalyst modified product
- titanium oxide photocatalyst based on doping with metal elements or nonmetal elements other than elements originally contained in titanium oxide photocatalyst.
- the ratio of the Ti element to the o element in the supported titanium oxide photocatalyst or the stoichiometric ratio that is, the one in which the ratio of the oxygen atom 2 to the Ti atom 1 is shifted, or the like.
- the reproduction apparatus is a reproduction apparatus for a lithographic printing plate material to which the above-mentioned hydrophilization promoting apparatus is applied, which responds to activation light having energy higher than the band gap energy on the surface of the substrate.
- a plate cylinder to which a plate material provided with a photocatalyst layer containing a photocatalyst exhibiting hydrophilicity is attached, a plate cleaning device for removing ink applied to the surface of the photocatalyst layer, and removal of the ink
- An image history erasing device for making the entire surface of the photocatalyst layer hydrophilic by irradiating the active light and erasing the image history on the surface of the photocatalyst layer; and heating the surface of the photocatalytic layer when the image history is erased.
- a heating device for promoting hydrophilization, and an organic compound supply device for supplying an organic compound to the surface of the photocatalyst layer.
- the surface of the plate is not heated by the heating device.
- the image history eraser irradiates the surface of the printing plate with active light to hydrophilize the entire surface of the photocatalyst layer to erase the image history on the surface of the photocatalyst layer.
- the organic compound is supplied to the surface of the photocatalyst layer by the organic compound supply device.
- the printing material can be regenerated and used repeatedly, the amount of printing material discarded after use can be significantly reduced, and the cost relating to the printing material can be reduced.
- photocatalytic activity can be accelerated to erase the history of the plate in a short time, and the plate reproduction time can be shortened.
- the heating device preferably heats the surface of the photocatalyst layer by electric heat. Alternatively, it is preferable to heat the surface of the photocatalyst layer by light irradiation.
- the organic compound supply device As a first configuration of the organic compound supply device, a property of being decomposed by the action of the photocatalyst upon irradiation with the active light, and a reaction or interaction with the surface of the photocatalyst layer, the surface of the photocatalyst layer It is preferable to supply an organic compound having the property of hydrophilizing to the surface of the photocatalyst layer.
- a plate comprising the non-image area shown and the image area showing hydrophobicity can be prepared.
- the surface converted to hydrophilic functions as a non-image portion to which dampening water is attached preferentially and hydrophobic ink is not attached.
- the organic compound and the photocatalytic layer surface react and / or interact to make the photocatalytic layer surface hydrophobic, the hydrophobic ink adheres preferentially to the plate surface which has not been irradiated with actinic light. It functions as an image area where dampening fluid does not adhere.
- hydrophilic non-image areas and hydrophobic image areas appear on the surface of the printing plate, it can be used as a lithographic printing plate.
- the organic compound supply device when the active light is irradiated
- the property of being decomposed by the action of the photocatalyst and the film melt by heating, and react and Z or interact with the surface of the photocatalyst layer or adhere to the surface of the photocatalyst layer to form the surface of the photocatalyst layer It is preferable to supply an organic compound having the property of becoming hydrophobic to the surface of the photocatalyst layer.
- the surface of the photocatalyst layer is irradiated with, for example, inert light, and the organic compound is heated and melted and fixed on the surface of the photocatalyst layer to make it hydrophobic, thereby writing a hydrophobic image area. It becomes possible. And, this hydrophobic image portion functions as an image portion to which the hydrophobic ink is attached preferentially and the dampening water is not attached.
- organic compounds on the surface of the printing plate which have not been irradiated with the inactive light are removed from the printing plate surface by dampening water or ink adhesion simultaneously with the start of printing, and the hydrophilic photocatalytic layer surface is exposed. Since dampening water adheres preferentially to the surface of the hydrophilic photocatalyst layer and no hydrophobic ink adheres to the surface, the plate functions as a printing area. As a result, the surface of the printing plate has a hydrophilic non-printing area. And a hydrophobic image portion appear, and can be used as a lithographic printing plate.
- a regeneration device having the organic compound supply device of the first configuration, and a surface of the photocatalytic layer covered with a hydrophobic organic compound is irradiated with the active light to be hydrophobic.
- an image writing device for writing an image on the surface of the photocatalyst layer by exposing the surface of the hydrophilic photocatalyst layer and decomposing and removing the organic compound.
- the surface of the photocatalyst layer covered with the organic compound is irradiated with the activation light of the photocatalyst by the image writing device to decompose and remove the hydrophobic organic compound, exposing the surface of the hydrophilic photocatalyst layer and making the surface of the photocatalyst layer hydrophilic. It is possible to form an image (latent image) consisting of a non-image area and a hydrophobic image area, so that the image can be written again on the plate material reproduced by the reproduction apparatus and used for printing. .
- a regeneration device having the organic compound supply device of the second configuration, and irradiation of inactive light of the photocatalyst to react the drawing member with the surface of the photocatalyst layer, and Z or It is characterized in that it comprises an image writing device for fixing by interaction and writing an image on the surface of the photocatalyst layer.
- the organic compound and the surface of the photocatalytic layer are fixed by reacting and / or interacting with each other, and the hydrophilic non- Since an image consisting of an image area and a hydrophobic image area can be written, the image can be written again on the plate material reproduced by the reproduction apparatus and used for printing.
- the lithographic printing plate of the present invention has a photocatalyst layer containing a photocatalyst, and image writing and image history erasing are carried out by irradiation with activating light having energy larger than the band gap energy of the photocatalyst.
- a lithographic printing plate material to be recycled characterized in that a hydrophilization promoting layer for promoting hydrophilization is provided between a substrate and the photocatalyst layer.
- the surface of the photocatalyst layer can be rapidly hydrophilized.
- the time taken for the printing process in particular, the image writing time and the image history erasing time can be significantly reduced, so that the print preparation time can be shortened.
- the hydrophilization promoting layer preferably contains a substance having a water storage function.
- the substance having a water storage function is preferably a silica-based compound.
- the photocatalyst is preferably a titanium oxide photocatalyst or a visible light responsive titanium oxide photocatalyst.
- the active light is preferably light having a wavelength of 600 nm or less.
- the surface of the photocatalytic layer is irradiated with an energy flux of light or electricity singly or in combination on the surface of the photocatalytic layer, friction is applied to the surface of the photocatalytic layer, and the photocatalytic layer It is preferable that the organic compound that interacts with the surface be provided to the surface of the photocatalyst layer, and be rendered hydrophobic either.
- the process for producing a lithographic printing plate according to the present invention is a process for producing the above-mentioned lithographic printing plate, which comprises forming the hydrophilization promoting layer on the substrate and then forming the hydrophilization promoting layer on the hydrophilization promoting layer.
- the method is characterized by including the step of forming the photocatalyst layer.
- the layered composition of the present invention has a photocatalyst layer containing a photocatalyst, and decomposes an organic compound present on the surface of the photocatalyst layer by irradiating an active light having energy larger than the band gap energy of the photocatalyst. And a photocatalyst containing a substance having a water storage function between the substrate and the photocatalyst layer. It is characterized by
- the substance having a water storage function is preferably a silica-based compound.
- the photocatalyst is preferably a titanium oxide photocatalyst or a visible light responsive titanium oxide photocatalyst.
- the method for producing a layered composition of the present invention is a method for producing the layered composition described above, wherein after forming the water accumulation layer on the substrate, the photocatalyst layer is formed on the water accumulation layer. It is characterized by including a step of Brief description of the drawings
- FIG. 1 is a schematic cross-sectional view in the case where the surface of a lithographic printing plate according to the first embodiment of the present invention exhibits hydrophobicity.
- FIG. 2 shows that the surface of the lithographic printing plate according to the first embodiment of the present invention is hydrophilic. It is a typical sectional view in the case of showing.
- FIG. 3 is a schematic perspective view showing a cycle from image writing to reproduction of the lithographic printing plate according to the first embodiment of the present invention.
- FIG. 4 is a flowchart for explaining the preparation and reproduction of a plate according to the first embodiment of the present invention.
- FIG. 5 is a schematic perspective view showing an example of a lithographic printing plate according to the first embodiment of the present invention.
- FIG. 6 is a graph showing the relationship between the heating temperature and the time taken for hydrophilization in the image history erasing step of the lithographic printing plate material according to the first embodiment of the present invention.
- FIG. 7 is a graph showing the relationship between the contact angle of water on the surface of the printing plate and time (or operation) according to the first embodiment of the present invention.
- FIG. 8 is a view schematically showing a printing press that performs printing and reproduction of a plate according to the first embodiment of the present invention.
- FIG. 9 is a graph showing the relationship between the temperature of the plate surface and the energy of hydrophilization in the image history erasing step of the lithographic printing plate material according to the first embodiment of the present invention.
- FIG. 10 is a schematic cross-sectional view when the surface of a lithographic printing plate according to a second embodiment of the present invention exhibits hydrophobicity.
- FIG. 11 is a schematic cross-sectional view in the case where the surface of a lithographic printing plate according to a second embodiment of the present invention exhibits hydrophilicity.
- FIG. 12 is a schematic perspective view showing a cycle from image writing to reproduction of the lithographic printing plate according to the second embodiment of the present invention.
- FIG. 13 is a flowchart for explaining the preparation of a lithographic printing plate according to a second embodiment of the present invention.
- FIG. 14 is a schematic perspective view showing an example of a lithographic printing plate according to a second embodiment of the present invention.
- Figure 15 shows the contact angle and time of water on the surface of the printing plate according to the second embodiment of the present invention Or the operation) is a graph showing the relationship.
- FIG. 16 is a graph showing the relationship between the temperature of the printing plate and the energy for hydrophilization in the step of erasing the image history of the lithographic printing plate material according to the second embodiment of the present invention. It is a graph which shows the change of the hydrophilization energy with respect to the surface temperature of the layered composition (lithography printing plate material) as three embodiments, and a solid line is shown.
- FIG. 1 and 2 show a lithographic printing plate (layered composition) according to the first embodiment of the present invention
- FIG. 1 is a cross-sectional view in the case where the surface of the printing plate exhibits hydrophobicity.
- Fig. 2 is a cross-sectional view in the case where the surface of the printing plate shows hydrophilicity.
- the lithographic printing plate 5 basically comprises a substrate 1, an intermediate layer 2, and a photocatalytic layer (photosensitive layer) 3.
- the planographic printing plate 5 is also referred to simply as a printing plate, and the printing plate having a printing image portion formed on the surface is referred to as a printing plate.
- the intermediate layer 2 is formed on the surface of the base material 1 in order to ensure that the base material 1 and the photocatalyst layer 3 described later adhere to each other and to improve adhesion. However, when the adhesion strength between the base 1 and the photocatalyst layer 3 can be sufficiently secured, the intermediate layer 2 may be absent. Furthermore, in the intermediate layer 2, the substrate 1 is a polymer film or the like. If it is formed, it may be formed to protect the substrate 1 as needed.
- the intermediate layer 2 for example, silica (S i ⁇ 2), silicon resin, silicon-based compounds such as silicone Ngomu is used as the material. Also, among them, silicone resins such as silicone alkyd, silicone urethane, silicone epoxy, silicone acrylic, silicone polyester, and the like are particularly used.
- the intermediate layer 2 may function to enhance the action of the photocatalyst of the photocatalyst layer 3. As such an intermediate layer 2, a layer containing a semiconductor or an electrical conductor is used.
- the semiconductor is zinc oxide Z n O, tin oxide S N_ ⁇ 2, an oxide semiconductor such as tungsten oxide wo 3 are preferred.
- the semiconductor fine particles may be formed into a film of another binder substance to form the intermediate layer 2.
- oxides such as I T O (oxide of indium and tin), metals such as aluminum, silver and copper, carbon black, and conductive polymers can be used.
- the intermediate layer 2 may be formed of these electric conductors themselves, or fine particles of an electric conductor may be formed into a film of another binder substance to form the intermediate layer 2.
- the intermediate layer 2 containing such a semiconductor or an electrical conductor, it is possible to accelerate the writing speed at the time of image writing with active light to shorten the plate making time or to reduce the light energy required for image writing. It becomes possible. Furthermore, it is possible to reduce the irradiation energy of the active light applied to the plate surface in order to erase (cancel) the image history when the plate is reproduced. The reason for this is presumed to be that the semiconductor or electrical conductor constituting the intermediate layer 2 enhances the function of the photocatalyst contained in the photocatalyst layer 3 described later.
- the intermediate layer 2 is subjected to heat treatment for the formation of the photocatalyst layer 3 described later.
- the impurities are thermally diffused from the substrate 1 and mixed in the photocatalyst layer 3 to prevent the reduction of the photocatalytic activity.
- the photocatalyst layer 3 is formed on the surface of the intermediate layer 2 including a photocatalyst.
- the photocatalyst layer 3 is directly formed on the surface of the substrate 1.
- the surface of the photocatalyst layer 3 is designed to exhibit high catalytic activity by being irradiated with activating light having energy higher than the band gap energy of the photocatalyst. This property is due to the property of the photocatalyst.
- FIG. 2 shows a state in which the photocatalytic layer 3 exhibiting hydrophilicity is exposed by irradiation with actinic light, and the exposure of the photocatalytic layer 3 having the hydrophilic photocatalytic layer results in the non-image area of the lithographic printing plate 5. It is possible to form a line portion.
- One of the features of the lithographic printing plate material 5 according to the present embodiment is light having a wavelength of 6 OO nm or less of visible light (ie, active light having a wavelength of 400 to 600 nm)
- the photocatalytic layer 3 is formed by including a photocatalyst that responds to at least one of ultraviolet rays having a wavelength of 400 nm or less.
- the surface of the photocatalyst layer 3 when the surface of the photocatalyst layer 3 is irradiated with activating light having a wavelength of 600 nm or less, the surface of the photocatalyst layer 3 exhibits high hydrophilicity, or, for example, an organic compound on the surface of the photocatalyst layer 3 When applied, this organic compound is oxidized and decomposed. The details of this organic compound will be described later.
- the photocatalyst does not exhibit photocatalytic activity unless it is irradiated with light having energy higher than the band gap energy.
- titanium oxide photocatalysts have a pand gap energy of 3 eV, so they respond only to ultraviolet light having a wavelength of about 4 O O n m or less.
- the present invention uses a photocatalyst that responds to active light having a wavelength of 600 nm or less, which includes visible light having a wavelength larger than that of ultraviolet light, by forming a new level between the pandogaps.
- active light having a wavelength of 600 nm or less, which includes visible light having a wavelength larger than that of ultraviolet light, by forming a new level between the pandogaps.
- active light of wavelength less than 600 nm, it is purple External rays are also included, but the active light may or may not contain ultraviolet light. That is, even in the case where only visible light having a wavelength of about 600 nm to 4 ′; about 0 nm is included, the photocatalyst responds similarly.
- a well-known method may be used as a method of producing a photocatalyst that responds to light in the visible light region.
- Japanese Patent Application Laid-Open No. 2 0 0 1-2 0 7 0 8 2 discloses a visible light responsive titanium oxide photocatalyst doped with nitrogen atoms
- Japanese Patent Application Laid-Open No. 2 0 0 1-2 0 5 0 4 Discloses a visible light responsive titanium oxide photocatalyst doped with chromium atoms and nitrogen atoms.
- Japanese Patent Laid-Open Publication No. 11 11 571 2 discloses a visible light responsive titanium oxide photocatalyst in which metal ions such as chromium are ion-implanted.
- visible light responsive titanium oxide photocatalysts using low temperature plasma and visible light responsive titanium oxide photocatalysts loaded with platinum have been published.
- a so-called visible light responsive photocatalyst produced by these known methods for example, a visible light responsive titanium oxide photocatalyst (titanium oxide photocatalyst modified product)] You can use
- a photocatalyst that uses ultraviolet light with a wavelength of 400 nm or less as the active light a photocatalyst commercially available as a normal titanium oxide photocatalyst may be appropriately selected and used.
- the particle diameter of the titanium oxide photocatalyst be as small as possible.
- the particle diameter of the titanium oxide photocatalyst is preferably not more than 0.1 ⁇ m, and more preferably not more than 0.5 ⁇ m.
- titanium oxide as a photocatalyst A photocatalyst is preferred, but of course is not limited thereto.
- the film thickness of the photocatalyst layer 3 is preferably in the range of 0.50 to 1 ⁇ m .
- the reason for this is that if the film thickness is too small, it is difficult to make full use of the above properties, and if the film thickness is too large, the photocatalytic layer 3 becomes cracked and causes a reduction in printing durability. It is for. Since this crack is remarkably observed when the film thickness exceeds 10 ⁇ ⁇ ⁇ , it is necessary to recognize 10 m as the upper limit even if the above range is relaxed. Also, in practice, it is more preferable to set a film thickness of about 0.10 to 0.5 ⁇ m.
- a sol coating method, an organic titanate method, a vapor deposition method or the like may be appropriately selected and formed.
- the sol coating solution used therein can improve the adhesion between the titanium oxide photocatalyst and the strength of the photocatalyst layer 3 and the adhesion between the substrate 1 and the photocatalyst layer 3.
- solvents, crosslinking agents, surfactants and the like may be added.
- the sol coating solution may be either normal temperature drying type or heat drying type. People are more preferable.
- the reason is that increasing the strength of the photocatalytic layer 3 by heating is advantageous for improving the printing durability of the printing plate 5.
- the hydrophilic surface is covered with a chemical reaction or strong interaction with at least a hydrophilic portion of the surface of the printing plate 5 (surface of the plate), and the photocatalytic layer 3 is hydrophobic It is of course preferable to have the function of converting into, or at the same time, one that is easily decomposed by the oxidative decomposition of the photocatalyst under active light radiation.
- organic compounds are classified into two types according to the writing method.
- the organic compound (type A) used in the present embodiment is supplied to the surface of the printing plate 5 and, if necessary, dried or heated and dried, it reacts and / or strongly interacts with the surface of the photocatalyst layer 3. Then, the surface of the photocatalyst layer 3 is hydrophobized, and when it is irradiated with active light, it is decomposed by the action of the photocatalyst of the photocatalyst layer 3 and removed from the surface of the photocatalyst layer 3.
- an organic compound specifically, an organic titanium compound, an organic silane compound, an isocyanato compound and an epoxide compound are preferable. Since these compounds react with the hydroxyl groups present on the surface of the hydrophilic photocatalyst layer 3 and are immobilized on the surface, in principle, a monomolecular organic compound layer (not shown) on the surface of the photocatalyst layer 3 Form As described above, since the surface of the photocatalytic layer 3 is hydrophobized with a monomolecular layer, decomposition under irradiation with active light is facilitated.
- Examples of the above organic titanium compounds include: 1) alkoxy titanium such as tetra-i-propoxytitanium, tetra-n-propoxytitanium, tetra-n-butoxytitanium, tetra-t-i-butoxytitanium, tetra-stearoxytitanium, 2) tri-n-butoxy Titanium stearate, such as titanium stearate, isopropoxytitanium tristearate, 3) Diisopropoxytitanium bisacetinolateacetonate, dihydroxy, bislactate titanium, titanium oxide, titanium chelate such as propoxy octylene glycol, etc. Etc.
- alkoxy titanium such as tetra-i-propoxytitanium, tetra-n-propoxytitanium, tetra-n-butoxytitanium, tetra-t-i-butoxytitanium, tetra-stearoxytitanium
- organic silane compounds 1) 1, limmethyl methoxysilane, trimethyoleethoxysilane, dimethyl jetoxysilane, methinolethtrimethoxysilane, tetramethoxysilane, methyltriethoxysilane, tetraethoxysilane, methylethoxysilane, octadecyltrimethoxisilane And alkoxysilanes such as octadecyl triethoxysilane, 2) trimethylchlorosilane, dimethinodichlorosilane, methinoletrichlorosilane, methyldichlorosilane, chlorosilanes such as dimethylchlorosilane, 3) bultriclosilane, byltri Ethoxysilane, ⁇ -Closored provirtrimethoxysilan, « ⁇ -Closer propinoremethinodichlorosilane,
- examples of the isocyanate compound include dodecyl isocyanate, octadecyl decyl isocyanate and the like.
- epoxide compounds there may be mentioned 1,2-diepoxydecane, 1,2-epoxyhexadecane, 1,2-epoxy decadecane and the like.
- organic titanium compound, organic silane compound, isocyanate compound and epoxide compound are not limited to the above-mentioned substances.
- the blade coating or The coating may be applied to the photocatalyst layer 3 by a method such as coating or dipping, or it may be applied as a microdroplet by spraying or the like.
- methods such as heating and vaporizing at a temperature lower than the decomposition temperature, vaporizing using a liquid atomization device using ultrasonic waves, a so-called nebulizer, etc. and spraying it on the surface of the photocatalyst layer 3 May be used. Needless to say, it may be used by dissolving it in another liquid for the purpose of adjusting the concentration, viscosity and the like of the organic compound.
- the flow of plate preparation and reproduction is as follows: organic compound supply step (hydrophobing step of plate surface) (S 20 0), image writing step (S 2 10), printing step (S 2) 20), and the steps of an ink removal step (S2 3 0) and an image history elimination step (S 2 4 0).
- “preparation of plate” means digital data of at least a part of the surface of the plate material 5 from the state (initial state) in which the surface of the plate material 5 (that is, the surface of the photocatalyst layer 3) is hydrophobized. Based on this, active light is irradiated to form a hydrophilic non-image area, and the surface of the plate material 5 is combined with the hydrophobic area (that is, the image area) of the surface of the printing plate 5 which was not irradiated with the active light. It means that a latent image consisting of a hydrophobic image area and a hydrophilic non-image area is formed.
- step (a) of FIG. 3 shows an organic compound applied to the surface of the photocatalytic layer 3 whose entire surface has been hydrophilized in the previous step (image history elimination step (step S 240)).
- the organic compound reacts with and / or interacts with the surface of the photocatalytic layer 3 to hydrophobize the surface of the photocatalytic layer 3 [hydrophobizing step of plate surface (step S 20 0)].
- Step (a) in FIG. 3 shows an initial state in which the organic compound is applied and the surface of the photocatalyst layer 3, ie, the entire surface of the printing plate 5 is hydrophobized.
- the surface of the hydrophobic printing plate 5 as shown in FIG.
- the contact angle of water 6 is preferably 50 ° or more. Or, it is the surface of the printing plate 5 having a temperature of 80 ° or more, and the hydrophobic ink for printing easily adheres, while the adhesion of dampening water is difficult.
- this state on the surface of the photocatalyst layer 3 is referred to as “initial state at the time of plate preparation”.
- This “initial state at the time of plate preparation” may be regarded as the start time of the actual printing process (step S 220). More specifically, for any image, digitized data is already prepared, and it can be regarded as a state when trying to write it on the printing plate 5.
- step S 210 an image is written on the surface of the photocatalytic layer 3 in a hydrophobic state as an image writing step (step S 210).
- the image writing is performed by writing the non-image portion on the surface of the photocatalytic layer 3 in accordance with the digital data related to the image so as to correspond to the data.
- the non-image area is a hydrophilic area where the contact angle of water 6 is 10 ° or less, and dampening water easily adheres, while the printing ink Adhesion is in a difficult state.
- the photocatalyst layer 3 including a photocatalyst that expresses catalytic activity by activating light is applied to the photocatalyst layer 3 including a photocatalyst that expresses catalytic activity by activating light. Irradiate.
- the organic compound is oxidatively decomposed and removed from the surface of the photocatalyst layer 3 by the action of the photocatalyst, and at the same time, the surface of the photocatalyst layer 3 is hydrophilized.
- the surface of the photocatalytic layer 3 which has not been irradiated with the active light remains hydrophobic, hydrophilic and hydrophobic portions are formed on the surface of the printing plate 5. That is, for example, as shown in FIG. 5, the portion 3a irradiated with the actinic light is a non-image portion showing hydrophilicity, and the portion 3b not irradiated with the actinic light is a image portion showing hydrophobicity. It has become possible to make a plate by
- step (b) of FIG. 3 visible light, for example, a wavelength of The non-image area 3 a is written by a write head using a W 03 laser, and the non-image area 3 a is formed on the surface of the hydrophobic photocatalyst layer 3.
- the hydrophilic non-image area 3a appear based on image data, for example, in addition to the writing head using a wavelength of 405 nm biometric laser, for example, )
- a light source for generating light with a wavelength of 360 nm to 450 nm and a writing head using a micro mirror, etc. Anything that writes the
- step S 2 10 At the end of the above-described image writing step (step S 2 10), as shown in step (c) of FIG. 3, an image area and a non-image area are formed on the surface of the photocatalytic layer 3 Printing becomes possible in the next printing process (step S 220).
- step S 220 the surface of the printing plate 5 is coated with a so-called emulsified ink in which a dampening water and a hydrophobic ink for printing are mixed with the dampening water.
- the shaded portion (that is, the hydrophobic image portion) 3b shows a state in which the hydrophobic ink is attached,
- the dampening water adheres preferentially to the remaining white area (ie, hydrophilic non-image area) 3a, while the hydrophobic ink is repelled and shows no adhesion.
- the image (pattern) coming up in this way the surface of the photocatalyst layer 3 has a function as a printing plate. After this, execute printing and finish printing.
- “reproduction of a plate” means that at least a portion of the plate material exhibits hydrophobicity and the remaining portion exhibits hydrophilicity after the surface of the plate material 5 is uniformly hydrophilized, and then this hydrophilic plate
- An organic compound is supplied to the surface of the photocatalyst layer 3 on the surface of the material 5, and the organic compound and the photocatalyst layer 3 are reacted and / or interacted with each other to surface characteristics of the photocatalyst layer 3 (that is, the photocatalyst Conversion of surface properties) to hydrophilic to hydrophobic
- the treatment for uniformly hydrophilizing the entire surface of the plate material 5 before the hydrophobization treatment is performed to completely erase the image history of the plate.
- step S 230 in the ink removing step (step S 230), ink, dampening water, paper dust and the like adhering to the surface of the photocatalyst layer 3 after printing is removed.
- the ink removal method the method of stopping the ink supply to the surface of the printing plate 5 and reducing the printing, the method of wiping the surface of the printing plate 5 with the mechanism for wiping off the cloth tape for wiping off the ink, for wiping off the printing
- a method of wiping the ink layer on the surface of the printing plate 5 with a roller coated with a cloth-like material, a method of spraying the washing liquid onto the surface of the plate member 5 by spraying, and washing the surface may be used as appropriate.
- the entire surface of the photocatalytic layer 3 is hydrophilized by irradiating the entire surface of the photocatalytic layer 3 with active light, and the contact angle of water 6 is 1 It can be a hydrophilic surface below 0 °. That is, the entire surface of the photocatalyst layer 3 can be brought into the state shown in FIG. 2 and all the image history can be erased [image history erasing process (step S 24 0)].
- the heating temperature to the surface of the photocatalyst layer 3 under irradiation with actinic light is increased, the time during which the contact angle of the water 6 becomes 10 ° or less, ie, the hydrophilicity of the surface of the photocatalyst layer 3 Will take less time. Therefore, the hydrophilicity of the surface of the printing plate 5 can be promoted.
- step (e) of FIG. 3 the surface of the photocatalyst layer 3 is irradiated with active light using an ultraviolet (UV) lamp, and infrared (IR) run is performed.
- UV ultraviolet
- IR infrared
- An example is shown in which the surface of the photocatalyst layer 3 is heated using
- Hot-air ventilation or light irradiation which heats the surface of the photocatalyst layer 3 is preferable.
- the light to be irradiated infrared rays are more preferable in consideration of heating efficiency.
- heating by electric heat may be used as a means for heating the plate surface.
- step S 220 there is a method of providing a heater inside the plate cylinder to which the printing plate 5 is attached and heating the plate cylinder from the inside, but with this method, the temperature of the plate cylinder itself becomes too high.
- step S 220 physical properties that affect printing quality such as the viscosity of the ink may fluctuate due to the influence of temperature, so it is necessary to take this into consideration and apply is there.
- the photocatalyst layer 3 whose entire surface has been rendered hydrophilic by heating under irradiation with active light is the step of hydrophobizing the plate surface shown in step (a) of FIG. Step S 2 0 0)
- the photocatalytic layer 3 whose entire surface has been rendered hydrophilic by heating under irradiation with active light is the step of hydrophobizing the plate surface shown in step (a) of FIG. Step S 2 0 0)
- supply an organic compound and react and / or interact the photocatalytic layer 3 with this organic compound to make the surface characteristics (photocatalytic surface characteristics) of the photocatalytic layer 3 hydrophilic Convert to hydrophobic (that is, hydrophobize) and set to the initial condition for plate preparation.
- FIG. 7 is a graph in which the horizontal axis represents time (or operation) and the vertical axis represents the contact angle of water 6 on the surface of the printing plate 5 and, regarding the printing plate 5 in the present embodiment, the photocatalytic layer 3 shows how the contact angle of water 6 on the surface changes with time or operation. That is, it can be determined whether it is in the hydrophobic state or in the hydrophilic state.
- the alternate long and short dash line indicates the contact angle of the non-line portion 3a
- the solid line indicates the contact angle of the line portion 3b.
- the surface of the photocatalyst layer 3 is irradiated with active light to keep the surface of the photocatalyst layer 3 in a highly hydrophilic state in which the contact angle of water 6 is 10 ° or less.
- an organic compound is supplied to the surface of the photocatalytic layer 3 as a plate surface hydrophobization step (step S 200) (step A shown in FIG. 7), and the organic compound and light are supplied.
- the photocatalytic properties of the photocatalytic layer 3 are converted from hydrophilic to hydrophobic by reacting and Z or interacting with the catalyst layer 3. That is, the contact angle of water 6 is 50 ° or more, preferably 80 ° or more.
- the time point (a) in FIG. 7 shows the time point when the hydrophobization treatment was started, and the time point (b) in FIG. 7 is the time point when the hydrophobization treatment was finished, that is, “initial state of plate preparation” Is shown.
- step S 210) non-image portion writing step, step B shown in FIG. 7
- the surface of the hydrophobic photocatalytic layer 3 is irradiated with active light to form a non-image portion 3 Start writing a [time point (b) in FIG. 7].
- the surface of the photocatalyst layer 3 irradiated with the actinic light is converted from hydrophobic to hydrophilic. That is, the contact angle of water 6 on the surface of the photocatalyst layer 3 becomes 10 ° or less.
- the surface of the photocatalytic layer 3 which is not irradiated with the active light maintains the hydrophobic state, so the non-irradiated part of the active light becomes a hydrophobic image part 3b, and the irradiated part of the active light is hydrophilic and not. Since it becomes an imaging unit 3a, it can function as a plate.
- step S 220 printing is started as a printing process (step S 220) (step C shown in FIG. 7) (time in FIG. 7 (c
- step S 230 shown in FIG. 7
- point (d) in FIG. 7 point (d) in FIG. 7
- step S 24 0 After completion of the ink removal, the surface of the photocatalytic layer 3 is irradiated with active light and the surface of the photocatalytic layer 3 is heated as an image history erasing step (step S 24 0) (step E shown in FIG. 7). Time point (e) in Fig. 7].
- step S 24 0 the surface of the photocatalytic layer 3 is heated as an image history erasing step (step S 24 0) (step E shown in FIG. 7). Time point (e) in Fig. 7].
- the hydrophobic streak portion 3 b is quickly decomposed and removed by the photocatalyst of the photocatalyst layer 3, and the photocatalyst is further converted from hydrophobic to hydrophilic, and the entire surface of the photocatalyst layer 3 is hydrophilized. That is, this image history erasing process (step S 240) can completely erase the version history.
- an organic compound is again supplied to the surface of the photocatalyst layer 3 as a next plate surface hydrophobing step (step S 200) (step A ′ shown in FIG. 7), and this organic compound is
- the plate material 5 can be returned to the “initial state at the time of plate preparation” by reacting or interacting with the photocatalytic layer 3 [point (a ′) in FIG. 7], and this plate material 5 can be reused. can do.
- This printing press 10 is centered on a plate cylinder 11 and has a plate cleaning unit 12, an image writing unit 13, an organic compound supply unit 14, a heating unit 15 and an image history erasing unit around it.
- the apparatus comprises an activating light irradiation device 16 for hydrophilization treatment, an inking roller 17, a dampening water supply device 18 and a blanket cylinder 19 as a hydrophilization treatment.
- the plate member 5 is wound around the plate cylinder 11 and installed. The plate reproduction and preparation will be described below with reference to FIG. 8.
- the plate tallying device 12 is brought into contact with the plate cylinder 11, and the ink attached to the surface of the plate 5 is wetted. Wipe off clean water, paper dust, etc.
- FIG. 8 shows an apparatus having a mechanism for winding a cloth-like tape for ink wiping as the plate cleaning apparatus 12, the invention is not limited to this.
- the plate creeping device 12 is detached from the plate cylinder 11 and the surface of the plate material 5 is heated by the heating device 15 while the surface of the plate material 5 is heated. Then make the entire surface of the plate material 5 hydrophilic.
- ultraviolet light having a wavelength of 400 nm or less is used as the active light, if the photocatalyst exhibits activity even with light having a wavelength of 400 nm to 600 nm, a wavelength of 400 nm can be used. ! You may use light of ⁇ 6 0 0 n m.
- the organic compound is supplied to the entire surface of the printing plate 5 by the organic compound supply device 14, and the organic compound and the photocatalyst layer 3 interact with each other to make the entire surface of the printing plate 5 hydrophobic.
- the organic compound supply device 14 is coated with a roller. Although the device is shown, it is not limited to this.
- the surface of the printing plate 5 is irradiated with actinic light by 13 to write the non-image area 3a (that is, an image is written on the surface of the printing plate 5).
- the plate cleaning device 12 for cleaning the surface of the plate material 5 attached to the plate cylinder 1 1 performs erasing of the image portion (image history erasing) by irradiation with active light.
- the plate member functions as a reproduction device for reproducing a plate, and further, an image writing device 13 for writing an image on the plate material 5 is provided, whereby the plate material 5 is used as a plate cylinder of the printing press 10.
- a series of plate recovery and plate making processes can be performed in the mounted state. According to this, it is possible to carry out continuous printing without stopping the printing press 10 and without having to change the printing plate.
- the printing plate 5 is configured to be wound around the plate cylinder 11.
- the force is not limited to this, and the photocatalyst layer 3 including the photocatalyst is provided directly on the surface of the plate cylinder 11. That is, it is needless to say that one in which the plate cylinder 1 1 and the plate member 5 are integrally configured may be used.
- a lithographic printing plate, a method of preparing a lithographic printing plate, and a method of recycling a lithographic printing plate according to a first embodiment of the present invention are described. Explained by giving more specific examples confirmed by Do.
- the photocatalytic powder was spotted at 0.2 g and uniformly spread on the bottom of a cylindrical reaction vessel (volume 500 mL) made of Pyrex (R) glass which can be sealed. Next, after degassing the inside of the reaction vessel, it was replaced with high purity air. After that, Acetone was injected so that the concentration in the reaction vessel became 500 ppm, and adsorption was carried out for 10 hours in the dark until reaching adsorption parallel at 25 ° C. After that, it was irradiated with blue LED (principal wavelength: 470 nm) made by Nichia Chemical Co., Ltd. and the amount of acetone and carbon dioxide was traced by Shimadzu gas chromatograph.
- blue LED principal wavelength: 470 nm
- the photocatalyst powder was dispersed in ion exchange water to form a slurry having a solid content of 20% by weight.
- the slurry was pulverized by a wet mill (trade name: Dinomill PI L T T) to obtain a photocatalyst dispersion liquid.
- a substrate made of stainless steel (SUS 301) having an area of 280 ⁇ 204 mm and a thickness of 0.1 mm was prepared, and subjected to alkaline degreasing treatment to obtain a printing plate substrate 1.
- a solution obtained by mixing 1 to 8 at a weight ratio of 1: 8 to the plate substrate 1 The resultant was heated at 350.degree. C. to form a photocatalyst layer 3 containing a photocatalyst on the substrate surface, and used as a printing plate.
- the thickness of the photocatalyst layer 3 was about 0. ⁇ .
- the contact angle of water was measured using a CA-W contact angle meter made by Kyowa Interface Science on the surface of the printing plate, the contact angle was 8 °, indicating sufficient hydrophilicity.
- the above-mentioned plate material exhibiting hydrophilicity was attached to a bench offset printing machine New Ace Pro of Alpha 1 Giken Co., Ltd., the hydrophobization treatment solution X was applied to the plate surface by a spray, and dried with a hot air drier.
- the printing plate was once removed from the printing press, and the contact angle of water was measured by the contact angle meter. The contact angle was 75 °, showing sufficient hydrophobicity, and the printing plate was in the initial stage of plate preparation. I confirmed that I was in a state.
- an image writing device using a semiconductor laser with a wavelength of 405 nm, an output of 5 mW Z-channel, and a beam diameter of 15 ⁇ m is used to print on the plate surface in 10% increments from 10% to 100%.
- the contact angle of water on the surface of the printing plate was measured with the contact angle meter after the writing was completed, the contact angle of the portion written by the semiconductor laser was 8 ° and the hydrophilic non-image portion was obtained. It was confirmed that the image had a hydrophobicity at a corner of 75 °.
- a halogen lamp After printing, use a halogen lamp to irradiate the entire surface of the plate with ink, dampening water, paper dust, etc. cleanly wiped off the ink, dampening water, paper dust etc. to heat the plate surface while using a low pressure mercury lamp. Irradiated with ultraviolet rays of 2 5 4 nm and illuminance of 10 mW Z cm 2 to decompose the image on the surface of the printing plate 5 and to hydrophilize the surface of the printing plate 5 to erase the hysteresis.
- the halogen lamp can adjust the plate surface temperature by adjusting the voltage supplied by the slider.
- the plate surface temperature was measured by a thermistor, and the irradiation energy of the above-mentioned ultraviolet light required until the image area with a contact angle of 75 ° became a hydrophilic surface with a contact angle of 10 ° or less was measured.
- Figure 9 shows the relationship between the hydrophilization energy (irradiation energy of ultraviolet light) and the printing surface temperature until the printing surface becomes hydrophilized.
- Plate surface temperature halogen lamp not lit
- Force S when the halogen lamp is turned on and the plate surface is heated, the plate surface temperature rises Irradiation energy decreased along with, and at 50 ° C irradiation energy decreased to half.
- the irradiation energy decreased to 0.1 lj Z cm 2 . This corresponds to an irradiation time of 10 seconds for the above-mentioned lamp of 10 mW Z cm 2 .
- the history elimination of the previous image is 120 seconds without heating, it can be completed in 10 seconds at a plate surface temperature of 200 ° C., and plate recovery can be performed quickly by plate surface heating. I could confirm that I could do it.
- the printing plate was returned to the state before the supply of the organic compound, and it was confirmed that the plate was able to be regenerated. Therefore, if the plate surface temperature is raised by about 50.degree. On the other hand, if the plate surface temperature is raised too much (about 200 ° C. or more), the physical properties of the plate surface will be adversely affected. Thus, it is preferable to heat the printing plate surface (photocatalyst layer 3 surface) to 50 ° C. or higher and 200 ° C. or lower. I'm sorry.
- FIGS. 10 and 11 show a planographic printing plate material (layered structure) according to a second embodiment of the present invention
- FIG. 10 shows the case where the surface of the printing plate material is hydrophobic.
- Fig. 11 is a sectional view of the case where the surface of the printing plate shows hydrophilicity.
- this planographic printing plate 35 has a base 1 and an intermediate layer. 2, and a photocatalyst layer 3 and a thermoplastic resin melt layer 34 formed by heating and melting resin fine particles.
- the planographic printing plate material 35 is also simply referred to as a plate material, and the plate material having a printing image portion formed on the surface is referred to as a plate.
- the base material 1, the intermediate layer 2, and the photocatalyst layer 3 are the same as those described in the first embodiment, the description thereof will be omitted, and in the following, the points different from the first embodiment will be described in detail. Do.
- the organic compound (type B) of a type different from the organic compound (type A) applied to the surface of the photocatalyst layer 3 in the first embodiment is used.
- thermoplastic resin molten layer 34 is formed by applying the above-mentioned organic compound of type B to the surface of the photocatalyst layer 3 and heating it.
- This organic compound (type B) is a thermoplastic resin, and this method uses a method in which fine particles of this resin are dispersed in a liquid, such as water or an organic solvent, to the plate surface. After applying the liquid containing the above-mentioned thermoplastic resin particles to the printing plate surface, if necessary, the liquid is dried by air-drying or the like, and then the resin fine particles are heated and melted by heating the area where the hydrophobic image portion is to be formed. When it is fixed to the surface of the photocatalytic layer 3 by reaction and Z or interaction, it acts as a hydrophobic streak. As a heating method, as described above, irradiation with inert light, heating with a thermal head, etc.
- a heating method as described above, irradiation with inert light, heating with a thermal head, etc.
- the organic compound may be melted to form a film without decomposition, and can be reacted and / or fixed on the photocatalyst layer 3.
- thermoplastic resin fine particle also has the property of hydrophobizing the surface of the photocatalyst layer 3 and the property of being decomposed by the action of the photocatalyst when irradiated with active light.
- thermoplastic resin fine particles may also be referred to as "image forming member”.
- reaction and / or adhesion means that the surface of the printing plate 35 is heated and melted to such an extent that sufficient strength can be maintained even at the time of printing to be in close contact with the surface of the photocatalyst layer 3. Also, whether or not any chemical reaction occurs with the photocatalytic layer 3 may be physical bond or chemical bond.
- the primary particle size of the thermoplastic resin is preferably 5 or less, preferably 1 m or less. If the particle diameter is too large, the film formed by heating and melting, that is, the film thickness of the streaked part is too large, and it takes too long to decompose the streaked part in the regeneration step, which is not practical.
- thermoplastic resin fine particles are heated and melted to form a film, and chemically react or strongly adhere to the hydrophilic portion of the surface of the printing plate 35 to impart hydrophobicity to the surface of the photocatalyst layer 3. It is preferable that the above reaction or sticking does not substantially occur at normal temperature.
- thermoplastic resins Various resins are known as such thermoplastic resins, but as the hydrophobizing agent for a printing plate of the present embodiment, a resin capable of forming fine particles of the above-mentioned size is preferred.
- Acrylic resins such as (meth) acrylic acid and (meth) acrylic acid esters, styrene resins, styrene 'acrylic acid, styrene' acrylic acid esters such as styrene 'acrylic resins, urethane resins, phenolic resins Resin, ethylene, ethylene 'ataline acid, ethylene, acrylic ester, ethylene acetate bure, modified ethylene vinyl resins such as ethylene vinyl acetate, bure acetate, vinyl propionate, poly bure alcohol, poly bure ether And other Biel resins are preferred.
- thermoplastic resin fine particles contains so-called emulsion or latex.
- the flow of plate preparation and reproduction in this embodiment is as follows: image drawing member supply process (organic compound supply process) (S 3 0 0), image writing process (S 3 10 0) The printing process (S320), the ink removal process (S330), and the image history erasing process (S340).
- image drawing member supply process organic compound supply process
- S 3 10 0 image writing process
- S320 The printing process
- S330 the ink removal process
- S340 image history erasing process
- preparation of plate refers to applying at least a part of the surface of the printing plate 35 based on digital data after applying a solution containing resin fine particles (organic compound) to the surface of the photocatalyst layer 3 Heat treatment is performed to form a hydrophobic image area, and resin fine particles on the surface of the plate material 35 that has not been heat treated are removed to expose the hydrophilic photocatalyst layer 3 surface, and the plate material 35 is applied on the surface. It refers to the formation of a latent image consisting of hydrophobic image areas and hydrophilic non-image areas.
- the photocatalytic layer 3 is formed on the surface of the photocatalytic layer 3 of which the entire surface is hydrophilized in the previous step (image history elimination step (step S 3 40)). Apply a liquid containing the organic compound (resin fine particles), and dry it at room temperature if necessary.
- this state on the surface of the photocatalyst layer 3 is referred to as “initial state at the time of plate preparation”.
- This “initial state at the time of plate making” may be regarded as the start of the actual printing process. More specifically, for any image, digitized data is already available, and it can be regarded as the state when trying to write it on the plate material 35.
- step S310 an image is written on the surface of the photocatalytic layer 3 as an image writing step (step S310).
- the image writing is performed by writing an image on the surface of the photocatalytic layer 3 in accordance with the digital data related to the image so as to correspond to the data.
- the image area is a hydrophobic area in which the contact angle of water 6 is 50 ° or more, preferably 80 ° or more, and the hydrophobic ink for printing is easy.
- adhesion of dampening water is difficult.
- the resin fine particle layer is heated, and the resin fine particles are melted to form a film on the surface of the photocatalyst layer 3 and the photocatalytic layer 3)
- the method of reacting and Z or fixing on the surface is preferred.
- the resin particles in the unheated area are removed to reveal the non-image area, and a plate can be produced.
- a heating method as described above, it is not possible. It is preferable to perform the heat treatment by irradiating the active light, specifically, the infrared light.
- step (b) of FIG. 12 at least a part of the resin fine particles is heated and melted to form a film by infrared irradiation using an infrared ray writing head, and reaction on the surface of the photocatalytic layer 3 is performed. Or fix it and form the image area To make it happen.
- step (c) of FIG. 12 After forming the streaked area, as shown in step (c) of FIG. 12, the resin fine particles of the portion not subjected to the image writing at the stage immediately after the start of printing are subjected to adhesion and / or dampening of the ink. It is removed from the surface of the printing plate 35 by the washing action of water to reveal non-image areas. As a result, as shown in step (c) of FIG. 12, the formation of the image area and the non-image area on the surface of the photocatalytic layer 3 is completed, and the printing becomes possible.
- step S320 the surface of the printing plate 35 is coated with a so-called emulsified ink obtained by mixing dampening water and a hydrophobic ink for printing and dampening water.
- a lithographic printing plate as shown in FIG. 14 is produced.
- the resin fine particles are heated and melted to form a film, and the thermoplastic resin melt layer 34 formed by reacting or adhering to the surface of the photocatalyst layer 3 containing the photocatalyst, ie, It shows that hydrophobic ink is attached to the hydrophobic image area.
- dampening water was attached preferentially to the remaining white part (photocatalytic layer 3 surface), that is, the hydrophilic non-image area 3a, while the hydrophobic ink was not attached and was not attached. It shows the state.
- the image (pattern) coming up in this way the surface of the photocatalytic layer 3 has a function as a printing plate 35. After this, execute printing and finish printing.
- production of plate means that the surface of the plate material at least a part of which is hydrophobic and the rest is hydrophilic is uniformly hydrophilized on the entire surface, and then the surface of the hydrophilic plate material is treated as an organic compound.
- the solution containing resin fine particles is applied, and if necessary, it is dried at a temperature around room temperature to restore the initial state of plate preparation again. Take a lesson.
- step S 330 As the ink removing step (step S 330) shown in step (d) of FIG. 12, the ink attached to the surface of the photocatalytic layer 3 after printing is finished, dampening water, paper Wipe off powder and so on.
- the entire surface of the photocatalyst layer 3 is irradiated with activating light having energy higher than the band gap energy of the photocatalyst on the entire surface of the photocatalyst layer 3 at least partially showing hydrophobicity.
- the resin fine particles are melted to decompose and remove the streaked portion 34, and the contact angle of the water 6 on the entire surface of the photocatalyst layer 3 is 10 ° or less. It can be made into the state shown in FIG.
- step (e) of FIG. 12 the case of using an ultraviolet irradiation lamp to decompose the image area by ultraviolet irradiation to expose the hydrophilic surface of the photocatalyst layer 3 is shown.
- the surface of the photocatalyst layer 3 is irradiated with inactive light while the active light is irradiated to the surface of the photocatalyst layer 3 using an ultraviolet (UV) lamp.
- UV ultraviolet
- An example of heating is shown.
- light to be irradiated for heating infrared rays are more preferable from the viewpoint of heating efficiency as shown in step (e) of FIG.
- step S 3 40 means such as hot air blowing to heat the surface of the photocatalyst layer 3 may be used.
- a solution containing resin fine particles is coated again at normal temperature on the surface of the photocatalyst layer 3 restored to the entire surface hydrophilicity, and if necessary, at room temperature. By drying, it is possible to restore the plate to its initial condition.
- FIG. 15 is a graph in which the horizontal axis represents time (or operation) and the vertical axis represents the contact angle of water 6 on the surface of the printing plate 35, and the photocatalytic layer of the printing plate 35 in the present embodiment 3 shows how the contact angle of water 6 on the surface changes with time or operation.
- the alternate long and short dash line indicates the contact angle of the non-image area
- the broken line (thick dashed line starting from the start points a and a ') indicates the photocatalytic layer common to the image area and the non-image area.
- 3 shows the contact angle of the surface
- the solid line shows the contact angle of the image area.
- the surface of the photocatalytic layer 3 is irradiated with ultraviolet light so that the contact angle of the water 6 on the surface of the photocatalytic layer 3 exhibits high hydrophilicity of 10 ° or less.
- step S 300 As the drawing member supply step (step S 300) (step A shown in FIG. 15), a solution (organic compound) containing resin fine particles is coated on the surface of the photocatalyst layer 3 [ As shown in Figure 15 (a)], dry the solution at room temperature, if necessary.
- Figure 12 shows the case where this drying step is not required. That is, the state in which the application of the liquid containing resin fine particles is finished, that is, the “initial state at the time of plate preparation” [time point (b) in FIG.
- step S 3 10 0 image writing portion writing step, step B shown in FIG. 15
- a portion corresponding to the drawing portion of the resin fine particle coated surface of the photocatalyst layer 3 is heat treated Then, start writing on the image area [point (b) in Fig. 15].
- the resin fine particles are heated and melted to form a film, and also react or adhere to the surface of the photocatalytic layer 3 so that the streaked portion exhibits high hydrophobicity.
- the reaction or adhesion between the resin fine particles and the plate surface It does not occur substantially and maintains the same state as before writing the image.
- the resin fine particles of the non-image area are treated as the non-image area removal process (step C shown in FIG. 15) immediately after printing.
- Removal from the surface of the photocatalytic layer 3 is started by the cleaning effect of the dampening water [point (c) in FIG. 15]. That is, the surface of the hydrophilic photocatalyst layer 3 is exposed as a non-image area.
- the surface of the photocatalytic layer 3 is formed of a hydrophobic image formed by reaction or adhesion of the film-like resin formed by melting of the resin fine particles, and a hydrophilic non-image formed area from which the resin fine particles have been removed. Will appear and be able to function as a version.
- step S320 processing will be started as a printing process (step S320) (process D shown in FIG. 15) [the time in FIG. d)].
- the ink is removed from the surface of the photocatalytic layer 3 to start creeping as the ink removing step (step S 330 shown in FIG. 15). Medium time point (e)].
- step S 3 40 the surface of the photocatalytic layer 3 is irradiated with active light as an image history erasing step (step S 3 40) (step F shown in FIG. 15).
- step S 3 40 the surface of the photocatalyst layer 3 is heated.
- the resin fine particles are melted and the streaks formed are quickly decomposed and removed, and the photocatalyst is further converted from hydrophobic to hydrophilic, and the entire surface of the photocatalyst layer 3 returns to hydrophilic again.
- step S 3 0 0 A shown in FIG. 15
- Hydrophobing device for printing plate) 14 is different from the organic compound supply device for supplying the organic compound (type A) of the first embodiment, and is a plastic resin fine particle, that is, a liquid containing the organic compound (type B) It goes without saying that it is configured to supply Further, the image writing device 13 is configured to irradiate the surface of the printing plate 35 with infrared rays.
- stainless steel (the area of which is 280 x 2 04 mm and whose thickness is 0.1 mm
- a substrate 1 made of SUS 3 04) was prepared, and this substrate 1 was anodized and black-dyed. As a result of this treatment, the absorptivity of the infrared rays of 800 nm was improved from 30% before the treatment to 90% or more after the black dyeing treatment.
- the black-dyed treated SUS substrate 1 was subjected to alkaline degreasing and used as a printing plate substrate 1.
- Heat treatment was carried out at 500 ° C. for 30 minutes to form an intermediate layer 2 with a thickness of about 0.7 m.
- the surface of the intermediate layer 2 is dip-coated with a solution obtained by mixing a sol TK S-203 for photocatalyst and a titanium oxide coating agent TKC-130 at a weight ratio of 1: 4.
- a photocatalyst layer 3 containing anatase type titanium oxide photocatalyst was formed on the surface of the printing plate.
- the thickness of the photocatalyst layer 3 is about 0.1 l am Met.
- styrene ′ atalyl resin (trade name “J-678”) manufactured by Johnson Polymer was used as an organic compound, and this was dissolved in ethanol to prepare a resin solution having a concentration of 1 wt%. After adding 10 wt% of surfactant IONET T-60-C (manufactured by Sanyo Chemical Industries, Ltd.) to the resin solution, the resin solution
- thermoplastic resin fine particles 30 parts by weight of ion exchanged water (cold water) was added to 70 parts to precipitate resin fine particles. Thereafter, ethanol was degassed using an evaporator at a liquid temperature of 40 ° C. to prepare an aqueous dispersion of thermoplastic resin fine particles, which was used as a hydrophobization treatment liquid Y. When the resin particles were observed with a scanning electron microscope, they were spherical particles with a particle diameter of 0.7 to 0. ⁇ ⁇ ⁇ ⁇ .
- the above-mentioned hydrophobizing agent After applying the above-mentioned hydrophobizing agent by roll coating to the entire surface of the printing plate that has been made hydrophilic by irradiating it with ultraviolet rays, it is air-dried at 25 ° C for 5 minutes, and then the wavelength 8 30 nm, output 100 mW
- the image writing device 13 using an infrared laser with a beam diameter of 15 m writes a dot image of 10% to 100% every 10% on the printing plate surface, and the resin of the irradiated part The fine particles were heated and melted, fixed to the printing plate surface, and a thermoplastic resin melt layer 34 was formed.
- the contact angle of water was measured with a C-A-W contact angle meter at the portion where the resin fine particles were fixed, the contact angle was 82 °, and it was confirmed that a line portion was formed.
- This plate material is a tabletop offset printer New Alpha Attached to the mouth, printing is performed on Ivest paper at a printing speed of 3500 sheets using Toyo Ink ink HYE COOB red MZ and Mitsubishi Heavy Industries 1% solution, dampening water solution. Confirmed that the halftone dot image can be printed ⁇ Reproduction of plate material>
- a halogen lamp After printing, use a halogen lamp to irradiate the entire surface of the plate with ink, dampening water, paper dust, etc. cleanly wiped off the ink, dampening water, paper dust etc. to heat the plate surface while using a low pressure mercury lamp. Irradiated with ultraviolet light of 2 54 nm and illuminance of 10 mW Z cm 2 , the image area on the surface of the plate 5 was decomposed, and the surface of the plate 5 was made hydrophilic to erase its history.
- the halogen lamp can adjust the plate surface temperature by adjusting the supplied voltage with a slider.
- the plate surface temperature was measured with a thermistor, and the irradiation energy of the above-mentioned ultraviolet light required until the image area with a contact angle of 82 ° became a hydrophilic surface with a contact angle of 10 ° or less was measured.
- Figure 16 shows the relationship between the hydrophilization energy (energy for UV irradiation) and the printing surface temperature until the printing surface becomes hydrophilized.
- Plate surface temperature halogen lamp not turned on
- the irradiation energy of the above-mentioned ultraviolet light was required for hydrophilization at 10.5 ° C at 1.08 J / cm 2.
- Irradiation energy decreased along with it, and at 50 ° C irradiation energy decreased to half.
- the irradiation energy decreased to 1.2 jZc m 2 at 200 ° C. This corresponds to an irradiation time of 60 seconds for the aforementioned 20 mW / cm 2 lamp.
- the plate surface temperature can be completed in 60 seconds at 200 ° C., and the plate reproduction can be performed promptly by the plate surface heating. It could be confirmed.
- the printing plate returned to the state before the supply of the organic compound, and it was confirmed that the printing plate could be regenerated.
- the plate surface temperature is increased by about 50 ° C or more, the irradiation energy is clearly It is possible to reduce the energy and, on the other hand, raising the plate temperature too much (about 200 ° C. or more) adversely affects the physical properties of the plate.
- the method and apparatus for regenerating a plate material for flat plate printing according to the first embodiment and the second embodiment of the present invention, it is possible to reuse the lithographic printing plate material.
- it also has the advantage of speeding up the cycle. In other words, it is possible to shorten the time for erasing the printing material history by erasing the image area after printing is completed, and it takes less time for the operation for reproducing the printing plate. Therefore, it is possible to complete the entire printing process very quickly.
- the surface of the photocatalytic layer 3 is irradiated with active light and heating is performed.
- the image area requiring hydrophilicity is more hot than the non-image area. You may make it heat.
- the entire surface of the photocatalyst layer 3 can be more uniformly and uniformly hydrophilized.
- the heating area may be controlled based on the image data.
- the present inventors have studied on image writing and image history erasing on a lithographic printing plate (layer composition) having a photocatalytic layer, It has been confirmed that the plate surface temperature may rise if an image is written with actinic light having an illuminance sufficient to obtain a practical level of image writing speed.
- a layered composition (which can be used as a lithographic printing plate as described later) 5 according to the third embodiment of the present invention is a substrate (or support) 1 and 1 as shown in FIG.
- An intermediate layer containing a substance having a water storage function (hereinafter, referred to as a water storage layer, a hydrophilization promoting layer) 2, and a photocatalyst layer 3 including a photocatalyst are basically included, that is, according to the present embodiment.
- the layered structure 5 differs from the first embodiment in the configuration of the intermediate layer 2.
- the substrate 1 is made of a metal such as aluminum or stainless steel, a polymer film or the like.
- the base material 1 is not limited to metals or polymer films such as aluminum or stainless steel, and properties required for putting the photocatalyst layer 3 to practical use, for example, those limited to these. However, it may be selected according to the properties of the base material such as flexibility, surface hardness, thermal conductivity, electrical conductivity, and durability.
- a water accumulation layer 2 as an intermediate layer is formed on the surface of the substrate 1. Although the intermediate layer 2 is formed to be in contact with the photocatalyst layer 3 in FIGS. 1 and 2, it is not necessary to be in contact with the photocatalyst layer 3, and it is provided between the substrate 1 and the photocatalyst layer 3 It would be nice if
- a silica-based compound is particularly preferable.
- a silica film precursor capable of forming a silica film such as a silica film, an organic silicon compound, or a water glass, or a silica particle precursor capable of forming a silica particle or silica particle is preferable.
- the substance having a water storage function is fine particles, it is preferable to form a film using a hydrophilic binder.
- the base material 1 and the water storage layer 2 may be used if necessary.
- An undercoat layer (not shown) may be provided between them.
- silica S i 0 2
- silicon resin silicon-based compounds such as silica Congo beam that is preferably used as the material.
- silicone resin silicone alkyd, silicone urethane, silicone epoxy, silicone silicone, silicone polyester, etc. are preferably used.
- the impurities are thermally diffused from the substrate 1 and mixed in the photocatalyst layer 3 to reduce the photocatalytic activity. There is also an effect to prevent. Further, when the base material 1 is formed of a polymer film or the like, the water storage layer 2 also has an effect of protecting the base material 1.
- the photocatalyst at normal temperature can be obtained. It was confirmed that the photocatalytic activity under heating atmosphere was higher than the activity.
- the water storage layer 2 is provided as a layer above the photocatalyst layer 3 or when the inside of the photocatalyst layer 3 contains a substance having a water storage function, the ratio of exposure of the photocatalyst to the surface decreases. Therefore, the photocatalytic activity is reduced as compared with the case where the water accumulation layer 2 is provided as an intermediate layer between the base material 1 and the photocatalyst layer 3 as in the present embodiment.
- a layered composition 5 having high photocatalytic activity at normal temperature is formed, and in order to further increase the photocatalytic activity in a heating atmosphere, a substance having a water storage function is allowed to coexist with the photocatalyst.
- the photocatalyst layer 3 it is preferable to use the photocatalyst layer 3 as the uppermost layer (uppermost surface layer) and to provide the water accumulation layer 2 between the substrate 1 and the photocatalyst layer 3.
- the photocatalyst when the photocatalyst is irradiated with active light, the photocatalyst generates electrons and holes, and the holes react with adsorbed water molecules on the surface of the photocatalyst layer 3 to generate OH radicals (hydroxy radicals). It is said that this OH radical oxidatively decomposes organic compounds.
- the layered structure 5 having the photocatalyst layer 3 is used as a lithographic printing plate material
- the irradiation energy of the activation light required for conversion from hydrophobicity to hydrophilicity by heating the portion irradiated with the activation light at the time of image writing on the printing plate surface by the functional light or by heating the plate surface with the energy of the activation light itself In the following, it is possible to reduce the hydrophilization process).
- the writing speed can be increased to shorten the plate making time, and the output of the image writing device can be reduced to reduce the cost of the writing device.
- the irradiation energy of the activation light required for erasing the history by simultaneously performing the temperature rise of the printing plate and the irradiation of the activation light. It is possible to reduce the output of the shortening or history erasing device (that is, to reduce the manufacturing cost).
- the photocatalyst layer 3 is formed on the water storage layer 2. And this photocatalyst layer 3 surface decomposes the organic type compound adhering to the photocatalyst layer 3 surface by irradiating the active light which has energy higher than the band gap energy of the photocatalyst, and at the same time the photocatalyst itself is high. It becomes hydrophilic.
- the following substances may be added to the photocatalyst layer 3 for the purpose of maintaining the hydrophilic property or improving the strength of the photocatalyst layer 3 and the adhesion with the water storage layer 2.
- this substance include silica-based compounds such as silica, silica sol, organosilane, silicone resin, metal oxides or hydroxides such as zirconium, aluminum and titanium, and fluorine-based resins. it can.
- a photocatalyst layer (not shown) that responds to light with a wavelength of 300 nm or less is further provided as a protective layer, or hydrophilicity is maintained.
- a silica layer (not shown) may be provided for the purpose of facilitating operation.
- the photocatalyst layer 3 referred to in the present invention may include the layer as described above.
- the photocatalyst layer 3 may be a layer consisting of a single photocatalyst.
- the photocatalyst layer 3 is provided.
- the layered composition 5 can be used as a lithographic printing plate. Further, for example, when aluminum is used as the substrate 1, the surface is roughened by anodizing the surface as needed, and a process called so-called graining treatment is applied to further improve the function suitable for printing. You may therefore, the layered structure 5 having the photocatalytic layer 3 can be used as it is as a lithographic printing plate material, or the substrate 1 subjected to the graining treatment may be used.
- the layered composition of the present invention exhibits a catalytic activity significantly higher than room temperature in a heated atmosphere
- the layered composition 5 is used in the surface layer of a structure used especially in a heated atmosphere, for example, a chimney.
- the photocatalyst decomposes the organic compound in the dirt component, and the dirt of the inorganic compound which can not be decomposed by the photocatalyst for expressing high hydrophilicity easily flows down with rain water, making the outer wall surface resistant to soiling. It also becomes possible.
- the layered composition 5 When the layered composition 5 is used as a lithographic printing plate, it is supplied to the surface (plate surface) of the printing plate as the organic compound for making the photocatalyst layer 3 hydrophobic, and it is dried or heat-dried as required.
- Type which reacts or strongly interacts with the plate surface, ie, the surface of the photocatalyst layer 3 to hydrophobize the surface of the photocatalyst layer 3, and is a type that is decomposed by the action of the photocatalyst and removed from the surface of the photocatalyst layer 3 (ie, first
- the organic compound of type A described in the embodiment is preferred. Although the description is omitted in the present embodiment, it is of course possible to make the photocatalyst layer 3 hydrophobic using the type B organic compound as described in the second embodiment.
- the method of preparing a plate and the method of reclamation in the case where the layered composition 5 of the present invention is applied to a lithographic printing plate material is the same as the method described in the first embodiment, so it is omitted here.
- the printing plate surface is heated only by the irradiation of the active light used for image writing and the printing surface is heated to an appropriate temperature for rapid image writing, it is necessary to heat the printing plate. Absent.
- photocatalytic properties are converted from hydrophilic to hydrophobic and restored to the “initial state at plate preparation” again, in addition to supplying to the plate surface organic compounds that interact with the plate surface, light, electricity, etc. It is also possible to irradiate the printing plate with an energy flux of 1 or more alone or in combination, or to make the plate hydrophobic by applying a mechanical stimulus such as friction to the printing plate.
- 0.2 g of the photocatalytic powder was collected and uniformly spread on the bottom of a cylindrical container (volume 500 mL) made of a sealable Pyrex (registered trademark) glass. Then, after degassing the inside of the reaction vessel, it was replaced with high purity air. Then, acetone was injected so that the concentration in the reaction vessel became 500 ppm, and adsorption was carried out for 10 hours in the dark until reaching adsorption parallel at 25 ° C.
- a base material 1 made of US 30 1) was prepared, subjected to an aluminum degreasing treatment, and used as a substrate 1 of a printing plate.
- S i 0 2 coating solution was diluted to S i O 2 solid content 5 wt% in L i 2 0 containing water glass LSS- 3 5 (manufactured by Nissan Chemical Industries) distilled water.
- This S i 0 2 coating solution was dip-coated on the substrate 1, air-dried, and fired at 500 ° C. for 1 hour to form a S i 0 2 water accumulation layer 2.
- the thickness of the S i 0 2 storage layer 2 was about 0.1 ⁇ m.
- the photocatalyst dispersion liquid and Rustica weight made of titanium oxide coating agent TKC one 3 0 1 Ltd. as T I_ ⁇ 2 ratio of 6: wherein the mixed solution at a rate of 4 S i 0 2 water storage layer 2 is coated
- the substrate 1 was dip-coated, air-dried, and baked at 350 ° C. for 1 hour to form a photocatalyst layer 3, thereby forming a lithographic printing plate 5.
- the thickness of the photocatalyst layer 3 was about 0. ⁇ ⁇ ⁇ .
- the contact angle of water 6 was measured using a CA-1 W contact angle meter manufactured by Kyowa Interface Science, the plate surface had a contact angle of 8 °, which indicated sufficient hydrophilicity.
- 1, 2-epoxydodecane (Wako Pure Chemical Industries, Ltd.) was dissolved in isoparaffin (trade name: Aisopar L, manufactured by Alexon Mobil) to make a 1 wt% solution. Then, the 1, 2-epoxide dodecane solution was roll coated on the surface of the printing plate, and dried at 60 for 10 minutes. After that, the contact angle of the water 6 was measured by the contact angle meter. The contact angle was 83 °, showing sufficient hydrophobicity, and it was confirmed that the surface of the plate member 5 was in the initial state at the time of plate making.
- isoparaffin trade name: Aisopar L, manufactured by Alexon Mobil
- the surface temperature of the hydrophobized printing material 5 is changed, and the active light of wavelength 3 60 nm, illuminance 1 OmW Zc m 2 is irradiated, and the contact angle is 1 0 from the state where the printing surface is hydrophobized as described above.
- the change of the hydrophilization energy accompanying the plate surface temperature change was measured by a method of determining the hydrophilization energy from the product of the actinic light irradiation time until the temperature becomes less than or equal to the actinic light irradiation intensity. The measurement results are shown in FIG.
- UV-Setter 710 announced by basysPrint (Germany), which can write an image (non-image area) by exposing ultraviolet light with a wavelength of 360 to 450 nm, using the above-mentioned hydrophobization treatment
- the halftone image was written on the printed surface in 10% increments from 1% to 100%.
- infrared light 0.1 seconds ago Before the plate surface is irradiated with infrared light 0.1 seconds ago to raise the temperature of the plate surface to about 240.degree.
- the image was written under the condition that the temperature slightly exceeded 200 ° C.
- the illuminance of the UV-Setter 710 at the wavelength of 360 nm is 200 mW / cm 2
- the irradiation time of the active light to one area is 0.1 seconds
- the irradiation energy is 0.10 JZ. It was set to 2 cm.
- the size of one area is 17 mm x 13 mm, the size is 2 8 0 x 2
- Image writing on 04 mm plate (image area is 2 7 2 mm x 9 5 mm) Took 24 seconds to When the contact angle of water 6 on the printing plate was measured with the contact angle meter after writing, the contact angle of the written part is 8 ° and it becomes a hydrophilic non-image part, and the contact angle of the unwritten part is It was confirmed that the image had a hydrophobicity at 83 °.
- This plate is attached to the mouth of Alpha I Giken Inc.'s desktop offset printing machine New Ace, and made using Toyo Ink ink HYE COOB red MZ and Mitsubishi Heavy Industries, Ltd. dampened water solution 1% solution
- Printing speed was set on printing paper at a printing speed of 350 sheets / hour. Printing started A halftone image could be printed on the paper from the first sheet.
- the entire surface of the plate is wiped clean with ink, dampening water, paper dust, etc., and the entire surface of the plate is irradiated with infrared radiation, and the plate surface temperature is raised instantaneously to about 100 ° C. It was irradiated with ultraviolet light with a wavelength of 360 nm and an illuminance of 5 mW / cm 2 for 8 seconds (as irradiation energy: 0.40 j Z cm 2 ). After that, when the contact angle of the water 6 was measured immediately with the contact angle meter at the portion where the halftone dots were written, the contact angle became 8 ° and the plate surface showed sufficient hydrophilicity, and the plate history could be erased. It was confirmed.
- the plate surface is roll coated with the 1, 2-epoxide dodecane solution,
- the contact angle of the water 6 was measured with the contact angle meter, and the contact angle was 84 °, showing sufficient hydrophobicity, and the plate material 5 It returned to the initial state and confirmed that the plate was able to be reproduced.
- a plate material was manufactured in the same manner as in the above example except that the photocatalyst layer 3 was formed directly on the stainless steel substrate 1. That is, the plate material was manufactured without providing the water storage layer 2.
- the change in the hydrophilicizing energy with respect to the printing surface temperature was measured in the same manner as in the above example. The measurement results are shown in FIG.
- the hydrophobization device 14 of the plate surface may irradiate the plate surface with an energy flux of light, electricity, etc. singly or in combination, or apply a mechanical stimulus such as friction to the plate surface, or Is configured as an apparatus that performs either of supplying an organic compound that interacts with the plate to the plate.
- the intermediate layer (water storage layer) 2 including the substance having the water storage function is provided between the base material 1 and the photocatalytic layer 3. Therefore, its photocatalytic activity can be greatly improved in a heating atmosphere, and the surface of the photocatalytic layer 3 can be rapidly hydrophilized.
- the image writing is performed by writing an image with active light in a heating atmosphere, in addition to the advantage that the reuse of the printing plate material becomes possible.
- Time can be reduced.
- the actinic light irradiation energy required for hydrophilization can be reduced, a low output writing device can be used, and the device cost can be reduced.
- the image history erasing time can be shortened by erasing the image history of the printing plate by irradiation with active light in a heating atmosphere.
- a low-output image history erasing device can be used, and the device cost can be reduced.
- the characteristics of the surface of the photocatalyst layer 3 are converted from hydrophobicity to hydrophilicity (switching) to produce a plate. Whether it is to erase the history of the plate or, in any case, it takes less time to perform these tasks, and it has the advantage of speeding up the cycle of plate making and plate regeneration.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60315824T DE60315824T2 (de) | 2002-03-22 | 2003-03-19 | Verfahren zur regenerierung einer lithographischen druckplatte |
US10/507,686 US20050139110A1 (en) | 2002-03-22 | 2003-03-19 | Method for regenerating lithographic printing plate, regenerating device, printer, lithographic printing plate and its production method, and layered structure body and its production method |
EP03710438A EP1495877B1 (en) | 2002-03-22 | 2003-03-19 | Method for regenerating lithographic printing plate |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2002081844A JP3868319B2 (ja) | 2002-03-22 | 2002-03-22 | 印刷用版材の再生方法及び再生装置並びに印刷機 |
JP2002-81844 | 2002-03-23 | ||
JP2002226540A JP2004066548A (ja) | 2002-08-02 | 2002-08-02 | 層状構成物及びその製造方法、平版印刷用版材及びその製造方法並びに印刷機 |
JP2002-226540 | 2002-08-02 |
Publications (1)
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WO2003080362A1 true WO2003080362A1 (fr) | 2003-10-02 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/003361 WO2003080362A1 (fr) | 2002-03-22 | 2003-03-19 | Procede permettant de regenerer une plaque d'impression lithographique, dispositif de regeneration, imprimante, plaque d'impression lithographique et procede de fabrication associe, et corps de structure stratifiee et procede de fabrication associe |
Country Status (4)
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US (1) | US20050139110A1 (ja) |
EP (1) | EP1495877B1 (ja) |
DE (1) | DE60315824T2 (ja) |
WO (1) | WO2003080362A1 (ja) |
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JP2007178885A (ja) * | 2005-12-28 | 2007-07-12 | Az Electronic Materials Kk | パターンおよび配線パターンならびにそれらの製造法 |
JP4987781B2 (ja) * | 2008-03-31 | 2012-07-25 | 株式会社東芝 | 光触媒体 |
JP5275275B2 (ja) * | 2010-02-25 | 2013-08-28 | 株式会社東芝 | 基板処理方法、euvマスクの製造方法、euvマスクおよび半導体装置の製造方法 |
US9878531B2 (en) | 2013-12-19 | 2018-01-30 | Goss International Americas, Inc. | Reimageable and reusable printing sleeve for a variable cutoff printing press |
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- 2003-03-19 DE DE60315824T patent/DE60315824T2/de not_active Expired - Fee Related
- 2003-03-19 EP EP03710438A patent/EP1495877B1/en not_active Expired - Fee Related
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Publication number | Publication date |
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DE60315824T2 (de) | 2008-05-15 |
EP1495877A1 (en) | 2005-01-12 |
US20050139110A1 (en) | 2005-06-30 |
DE60315824D1 (de) | 2007-10-04 |
EP1495877B1 (en) | 2007-08-22 |
EP1495877A4 (en) | 2005-06-15 |
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