JPH11300923A - Plate making and printing method on inkjet printing machine - Google Patents

Abstract

(57) [Problem] To provide a plate making method and a printing method on an ink jet printing machine which solve various problems of the conventional ink jet plate making. A lithographic printing press having a printing unit including a plate cylinder (1), a blanket cylinder (2) and an impression cylinder (3) is used.
(A)
I) Forming an ink image by scattering ink on the support (4) fixed on the automatic support supply section (10) on the lithographic printing press or (AII) on the support fixed on the plate cylinder (1) After that, the dampening solution supply roller and the printing ink supply roller are operated, and the blanket cylinder (2) and the impression cylinder (3) are rotated in contact with each other and the printing paper is fed to perform printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to plate making on an ink jet printing machine and a printing method.

[0002]

2. Description of the Related Art As one of plate making methods, a method of forming an ink image by scattering ink on a printing plate by an ink-jet method is disclosed in, for example, JP-A-51-84303.
JP-A-56-113456, JP-A-4-6924
No. 4, for example.

[0003]

By the way, the conventional plate making method is a method of making a plate by an ink jet plate setter and then conveying the obtained printing plate to a printing machine manually or by a conveying roller. Therefore, the plate making process and the printing process need to be performed by independent devices, which is disadvantageous in terms of installation space and work efficiency of the device, and furthermore, the printing plate is contaminated by dust and oil during transportation. There are various problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plate making method and a printing method on an ink jet printing machine which solve various problems of the conventional ink jet plate making.

[0005]

That is, the gist of the present invention is to provide a lithographic printing press provided with a printing unit including a plate cylinder, a blanket cylinder, and an impression cylinder, and an ink jet apparatus arranged in the vicinity thereof. AI) ink is formed on the support fixed to the support automatic supply unit on the lithographic printing press or (AII) the support fixed on the plate cylinder to form an ink image, and then dampening water is supplied. A plate making method and a printing method on an ink jet printing machine, characterized in that a roller and a printing ink supply roller are operated, a blanket cylinder and an impression cylinder are contacted and rotated, and printing paper is fed to perform printing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a conceptual diagram of an example of an apparatus used in one embodiment of the present invention, and FIG. 2 is a conceptual diagram of an example of an apparatus used in another embodiment of the present invention.

First, an outline of an apparatus used in the present invention will be described. In a preferred embodiment, the apparatus shown in FIGS. 1 and 2 separates each cylinder (between the plate cylinder (1), the blanket cylinder (2), and the impression cylinder (3)) from each other, and furthermore,
It is possible to control the supply of paper to the impression cylinder (3), and to control the plate cylinder (1) with an inking roller and a dampening device (6) of an ink filling device (5) as a surface treatment agent supply roller. With the exception of the point that the watering roller can be separated and ancillary devices such as a body washing mechanism (7), a post-curing device (8), an ink jet device (9) and an automatic support supply section (10) are arranged. It is the same as a known lithographic printing press.

In the plate making step (AI) in the case of the apparatus shown in FIG. 1, an automatic support supply section (10) on a lithographic printing press is used.
The ink is formed by scattering ink on a support (4) fixed to the plate to form an ink image. In the apparatus shown in FIG. 2, the plate making step (AII) is fixed to the plate cylinder (1). This is performed by forming an ink image by scattering ink on the support (4).

The separation between the cylinders is performed by appropriate mechanical means such as using an eccentric bush for the blanket cylinder (2) and the impression cylinder (3), and the plate cylinder (1).
The separation of the ink applying roller and the water applying roller can be easily performed by appropriate mechanical means such as a cam provided on the plate cylinder (1) and a link provided on each roller.

Next, the material used in the present invention, that is,
The support, the inkjet ink, and the surface treatment agent will be described.

In the present invention, preferred examples of the support (4) used for forming a printing plate include a support having an average surface roughness (Ra value) of 0.3 to 0.9 μm and an anodized film. An aluminum support which has been roughened and anodized to a thickness of 5 to 40 mg / dm ² . Here, the Ra value is measured using a surface roughness meter (“SE-3D” manufactured by Kosaka R & D Co., Ltd.).
HL ”) means a value measured under the conditions of a scan length of 4 mm, no high-frequency cutoff, and a low-frequency cutoff of 0.8 mm.

Another preferred example of the support (4) is a support having a peel strength of the gum tape from the support of 500 g / cm or less as determined by a peel strength measurement method using a gum tape. Here, the peel strength is 25 ° C.
Under a condition of 5 kg / cm ² and 50 cm / min, a gum tape (“SLION TA” manufactured by SLIONTEC) was applied to the surface of the support.
PE "), the support is fixed on a fixed base,
Adhesive tape and support are 30cm / min in 180 ° direction
Force required when pulling the packing tape away from it (F)
Is obtained by dividing by the width of the packing tape (g / cm)
Means

The support as described above has the effect of firmly fixing the ink image formed by the jet,
Further, it has sufficient water retention of non-image portions during printing, and has an effect of suppressing generation of stains (ground stains) due to ink adhesion to non-image portions.

The ink used in the present invention may contain an organic polymer substance in order to improve the film strength of the ink image.

As the above-mentioned organic polymer substance, for example,
Unsaturated acids such as (meth) acrylic acid and itaconic acid;
Copolymers of alkyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, styrene, α-methylstyrene, etc .; copolymers of alkyl methacrylate and alkyl acrylate represented by polymethyl methacrylate Copolymer; Copolymer of alkyl (meth) acrylate with acrylonitrile, vinyl chloride, vinylidene chloride, styrene, etc .; Copolymer of acrylonitrile with vinyl chloride or vinylidene chloride; Modified cellulose having carboxyl group in side chain; Poly Ethylene oxide; polyvinylpyrrolidone; phenol, o-, m-, p-cresol;
Pyrogallol and / or xylesol, and aldehyde,
Novolak resin obtained by a condensation reaction with acetone or the like; Polyether of epichlorohydrin and bisphenol A; Soluble nylon; Polyvinylidene chloride; Polyolefin chloride; Copolymer of vinyl chloride and vinyl acetate; A copolymer of acrylonitrile and styrene; a copolymer of acrylonitrile and butadiene and styrene; polyvinyl alkyl ether; polyvinyl alkyl ketone; polystyrene; polyurethane; polyethylene terephthalate isophthalate; acetyl cellulose; Celluloid; polyvinyl butyral and the like are used. In the above, “(meth) acryl” indicates “acryl or methacryl”.

The proportion of the organic high molecular substance in the ink is usually 2 to 95% by weight, preferably 5 to 90% by weight, more preferably 10 to 80% by weight, based on the total weight of the solid components of the ink.

In the present invention, if necessary, nitrocellulose may be added to the ink in order to enhance the vaporization or thermal expansion effect of the ink.

As the nitrocellulose, natural cellulose purified according to a conventional method is esterified with nitric acid with a mixed acid, and a nitro group is added to a part or all of three hydroxyl groups present in a glucopyranose ring which is a constituent unit of cellulose. Nitrocellulose introduced is preferred. The nitrification degree of nitrocellulose is usually 2 to 13, preferably 10 to
12.5, and more preferably 11 to 12.5. Here, the degree of nitrification indicates the weight% of nitrogen atoms in nitrocellulose. If the degree of nitrification is too high, the effect of promoting the vaporization and thermal expansion of the ink is enhanced, but the room temperature stability tends to decrease, and the nitrocellulose becomes explosive. Dangerous handling. If the nitrification degree is too low, the effect of promoting the vaporization and thermal expansion of the ink cannot be sufficiently obtained. The polymerization degree of nitrocellulose is usually 20 to 200,
Preferably it is 25-150.

The mixing ratio of the nitrocellulose is usually 0.1 to 60% by weight, preferably 5 to 50% by weight, based on the total weight of the solid components of the ink.

The ink used in the present invention may contain a coloring material, if necessary. As a coloring material, a pigment or a dye is used. For example, Victoria Pure Blue (42595), Auramine O (4
1000), Catillon Brilliant Flavin (Basic 13), Rhodamine 6 GCP (45160), Rhodamine B (45170), Safranin OK 70: 100
(50240), Erioglaucine X (42080),
First Black HB (26150), No. 120
/ Lionol Yellow (21090), Lionol Yellow GRO (21090), Shimla First Yellow 8GF (21105), Benzidine Yellow 4T-5
64D (21095), Shimla Fast Red 40
15 (12355), Lionol Red B4401 (1
5850), Fast Gen Blue TGR-L (741)
60) and Lionol Blue SM (26150). The numbers in parentheses above indicate the color index (CI).

The mixing ratio of the coloring material is usually 0.1 to 80% by weight, preferably 2 to 50% by weight, based on the total weight of the ink solid components.

Further, the ink used in the present invention contains a light or heat curable composition for curing the ink image formed on the support by light irradiation or heat treatment (to improve durability). Can be done.

Examples of the light or thermosetting composition include a resol compound described in JP-A-7-20629, a crosslinkable amino compound derivative described in JP-A-8-324025, and a compound described in JP-A-8-24025. No. 272094, an epoxy compound described in JP-A-8-262714, and an acrylate monomer described in JP-A-8-262714.
Ether described in JP-A-10-2050
No. 6, JP-A-10-3166, and a composition containing a photopolymerizable substance.

The mixing ratio of the above-mentioned light or thermosetting composition is usually 0.1 to 80 with respect to the total weight of the ink solid components.
% By weight, preferably 0.1 to 70% by weight.

The ink used in the present invention may further contain various additives such as an ink storage stabilizer and an adhesion improver as long as the performance of the ink is not impaired.

The above ink is usually used by dissolving the above components in an appropriate solvent. The solvent is not particularly limited as long as it has sufficient solubility for the components used. For example, cellosolve solvents such as methyl cellosolve, ethyl cellosolve, and methyl cellosolve acetate; propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate And propylene glycol solvents such as dipropylene glycol dimethyl ether; ester solvents such as methyl lactate, ethyl lactate and methyl 2-methoxypropionate; alcohol solvents such as hexanol and diacetone alcohol; ketone solvents such as cyclohexanone; Highly polar solvents such as methylpyrrolidone; mixed solvents thereof; and mixed solvents obtained by adding aromatic hydrocarbons to these solvents.

The ink used in the present invention may be a water solvent. In such a case, the water-insoluble substance among the above components is converted into fine particles having a particle size of about 0.1 to 500 μm. Can be dispersed.

The use ratio of the above-mentioned solvent is usually 1 to 20 times by weight based on the total weight of each component of the ink.

Further, in addition to the above-mentioned components, the inkjet ink in which the heating source is a laser absorbs laser light and converts the absorbed light energy into heat energy.
A photothermal conversion substance having a function of generating pressure on the ink in the capillary and causing the ink to scatter from the capillary by containing a large amount of thermal expansion or vaporization of the ink is contained.

The light-to-heat conversion material is not particularly limited as long as it generates heat upon irradiation with a laser beam. For example, an organic or inorganic material having an absorption band in a part or all of a wavelength range of 650 to 1300 nm is used. Examples include pigments, organic dyes, metals, and the like.

Specific examples of the light-to-heat conversion material as described above include carbon black; graphite; metals such as titanium and chromium; metal oxides such as titanium oxide, tin oxide, zinc oxide, vanadium oxide and tungsten oxide; titanium carbide. Metal boride; metal boride; JP-A-4-3222
No. 19, an inorganic black pigment, an azo black pigment, and a black or green organic pigment such as "Lionol Green 2YS" and "Green Pigment 7". Examples of the carbon black include “MA-7”, “MA-100”, and “MA-22”, which are products of Mitsubishi Chemical Corporation.
“0”, “# 5”, “# 10”, “# 40”, “Color Black FW2”, “FW2”, a product of Degussa
0 "," Printex V "and the like.

Also, "special functional dyes" (edited by Ikemori and Hashiya, 1986, published by CMC Inc.), "chemistry of functional pigments" (edited by Higaki, 1981, issued by CMC Inc.), " Dye Handbook "(edited by Okawa, Hirashima, Matsuoka, Kitao, published by Kodansha)
Exciton Inc., a catalog published in 1995.
And dyes having absorption in the near infrared region described in Laser Dye Catalog issued in 1989.

Further, JP-A-2-2074, JP-A-2-2074
Nos. 5, 2076, and JP-A-3-97590, 97
No. 591, No. 63185, No. 26593, No. 975
Organic dyes described in JP-A-89-89, and product “IR820B” of Nippon Kayaku Co., Ltd., and the like. Other examples include dyes and pigments having absorption in the near infrared region described in the specification filed by the present applicant as Japanese Patent Application No. 9-30195.

The surface treating agent used in the present invention includes, in addition to printing ink and fountain solution, a hydrophilizing agent having a function of enhancing water retention of non-image areas and removing dirt such as dust and oil. For example, a surfactant, an organic solvent, an alkali agent and the like can be used (Japanese Patent Application No. Hei 9-170117).
issue).

In the present invention, a suitable surface treatment agent is used depending on the type of the support to be used, but it is preferable to use a surface treatment agent containing no alkali agent. That is, as the surface treatment agent, a printing ink, a fountain solution or a hydrophilizing agent is preferable.

Next, the plate making process in the present invention will be described. In the present invention, as an inkjet method, “Imaging Part2” (edited by Yasunori Ichikawa, Inc.)
JP-A-7-108769, for example, a method described in JP-A-7-108767, which is a method described in, for example, Japanese Patent Application Laid-Open No. 7-108767. Japanese Patent Application Laid-Open No. 7-68802, that is, the liquefied dye of the aggregate element is placed in an aggregate element of fine particles such as glass beads filled by injecting the liquefied dye by capillary action. By irradiating a laser beam condensed from the direction opposite to the direction in which the dye is transferred, the above-described method of vaporizing the liquefied dye and scattering it on the support can be appropriately selected and used.

The basic feature of the present invention is that a lithographic printing press as described above having a printing unit consisting of a plate cylinder (1), a blanket cylinder (2) and an impression cylinder (3) is used and arranged in the vicinity thereof. Ink is applied to the support (4) fixed on the support automatic supply unit (10) on the lithographic printing press or the support (4) fixed on the plate cylinder (1) from the inkjet device (9). The point is that plate making is performed by causing ink images to be formed by scattering. That is, a basic feature of the present invention resides in plate making on a printing press using ink jet. Then, after the plate making, the dampening solution supply roller and the printing ink supply roller are operated according to a known method, and the blanket cylinder (2) and the impression cylinder (3) are rotated while contacting, and the printing paper is fed to perform printing. .

The plate making step in the present invention includes two embodiments. First, the plate making process (AI) using the apparatus shown in FIG. 1 will be described. The plate making step (AI) is performed by forming an ink image by scattering ink from the inkjet device (9) on the support (4) fixed to the automatic support supply section (10).

The automatic support supply section (10) can be constituted by a known mechanism used in a printing press. The support automatic supply unit (10) shown in FIG. 1 has transport rollers (12) and (13) arranged vertically at the tip of the support mounting unit (11), and is provided on the support mounting unit (11). Has a structure in which the support (4) placed on the plate cylinder (1) is fed one by one onto the plate cylinder (1) by the transport roller described above. An ink jet device (9) supported by a moving mechanism (14) including a ball screw is disposed above the support mounting portion (11). In such a configuration, ink is scattered on the support (4) to form an ink image (printing plate) while moving the ink jet device (9), and then printing is performed by driving the support automatic supply unit (10). The plate is fed to the plate cylinder (1) and fixed by known means. As the inkjet device (9), a known inkjet printer or the like can be used.

The above-described plate making step (AI) is performed during the printing step.
That is, the dampening solution supply roller and the printing ink supply roller are operated, the blanket cylinder (2) and the impression cylinder (3) are brought into contact with each other, and the printing paper is fed while printing is being performed. preferable. According to such an embodiment, usually, there is an advantage that the printing process for 10 to 20 minutes required for printing one sheet can be effectively used.

When the plate making process (AI) is adopted, the plate making process and the printing process are performed by one printing machine.
The installation space of the apparatus is small, and since there is no need to manually carry in the support and the printing plate, it is possible to prevent the accompanying contamination.Furthermore, when the above preferred embodiment is adopted, productivity is reduced. There are advantages such as improvement and reduction of human rights costs.

Next, the plate making process (AI) using the apparatus shown in FIG. 2 will be described. Plate making process (AII)
Is performed by forming an ink image by scattering ink from an ink jet device (9) on a support (4) fixed on the plate cylinder (1). In this case, the support (4)
The feeding and fixing onto the plate cylinder (1) is preferably performed simply and automatically by a support automatic supply unit as in the case of the apparatus shown in FIG. When the device shown in FIG. 2 is used, the ink jet device (9) is arranged in the axial direction on the plate cylinder (1).
, That is, spiral scanning for high-definition image formation can be realized. Note that the scanning direction of the inkjet device (9) may be the rotation direction on the plate cylinder (1) or the like.

The plate making process (AII) is performed between the cylinders (between the plate cylinder (1), the blanket cylinder (2) and the impression cylinder (3)), the dampening water supply roller and It is preferable that the printing is performed after the printing ink supply rollers are separated from each other and the paper supply to the impression cylinder (3) is stopped.

That is, in a lithographic printing press, the printing cylinder (1), the blanket cylinder (2) and the impression cylinder (3) always rotate in contact with each other, as a matter of course from the viewpoint of printing. It is configured as follows. Therefore, in the present invention, as described above, as a preferable embodiment, the blanket cylinder (2) and the impression cylinder (3) are modified so as to be separated from each other, and the blanket cylinder (2) and the impression cylinder (3) are separated from each other. After the paper supply to the impression cylinder (3) is stopped, the above-described plate making step (AII) is performed. As a result, since paper feeding is stopped during the plate making process, waste paper can be eliminated. In particular, such an effect becomes remarkable when a surface treatment agent described later is used.

When the above-described plate making process (AII) is employed, as in the case of the plate making process (AI), the installation space of the apparatus is small, and there is no need to manually carry in the printing plate. The accompanying contamination can be prevented. Further, when the above-described preferred embodiment is adopted, it is possible to reduce waste paper.

In the present invention, after the plate making step (AI) or (AII) on the printing press, the space between the cylinders (the space between the plate cylinder (1), the blanket cylinder (2) and the impression cylinder (3)). ), The dampening solution supply roller and the printing ink supply roller are separated from each other, and further, while the paper supply to the impression cylinder (3) is stopped, the printing plate obtained in the plate making process (B) is placed on the printing plate. Supply the surface treatment agent from the surface treatment agent supply roller, and then
(C) Preferably, the plate cylinder (1) and the blanket cylinder (2) are rotated in contact. As a result, the water retention of the non-image area is enhanced, and dirt such as dust and oil is removed, so that a high-definition and favorable printing process can be performed.

In the present invention, it is preferable that after the surface treatment agent is supplied onto the printing plate, the printing plate and the surface treatment agent supply roller are separated from each other. That is, the supply of the surface treatment agent onto the printing plate (4) fixed on the plate cylinder (1) is performed by an ink deposition device (5) as a surface treatment agent supply roller arranged in contact with the printing plate (4). And the dampening unit (6). Then, in the present invention, normal printing is continuously performed after the plate making. Therefore, in this case, it is preferable to operate as described above in order to prevent foreign substances generated during the surface treatment from being mixed into the above-mentioned inking roller and watering roller.

In the present invention, the blanket cylinder (2)
The plate cylinder (1) and the blanket cylinder (2) are kept in a contact rotation state or a separated state while maintaining the separation state between the plate cylinder and the impression cylinder (3), and a cylinder cleaning mechanism ( According to 7), the used surface treatment agent on the plate cylinder (1) and the blanket cylinder (2) is preferably removed. By such an operation, it is possible to eliminate waste paper similar to that described above in normal printing to be performed subsequently.

In the present invention, the plate making step (A)
After I) or (AII), the entire surface of the ink image can be photo-cured or heat-cured on the printing press in order to increase the printing durability of the plate. The entire surface light curing or thermal curing is performed by a post-curing device (8) installed near the plate cylinder (1).

[0050]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention. In the following examples, the support produced in Reference Example 1 was used.

Reference Example 1 (1) Production of a support: An aluminum plate having a thickness of 0.2 mm was degreased with a 3% by weight aqueous solution of sodium hydroxide to obtain 18 g /
In a nitric acid bath of L concentration, electrolytic etching was performed for 15 seconds at a current density of 80 A / dm ² , desmutted with a 1% by weight aqueous sodium hydroxide solution at 50 ° C. for 5 seconds, and performed with a 10% by weight aqueous solution of nitric acid at 25 ° C. for 5 seconds. After washing with water, the resultant was subjected to anodization at a current density of 10 A / dm ² for 16 seconds in a 30% by weight sulfuric acid bath, washed with water and dried to obtain a support. The resulting support had an average roughness (Ra) of 0.6 μm, an anodized film thickness of 2.1 mg / dm ² , and a peel strength with a gum tape of 300 g / cm.

Example 1 A printing press (lithographic printing press "Dia F-2" manufactured by Mitsubishi Heavy Industries, Ltd.) was used after being modified as shown in FIG. First, the distance between the cylinders (between the plate cylinder (1), the blanket cylinder (2), and the impression cylinder (3)), the dampening water supply roller and the printing ink supply roller are separated from each other. 3) With the paper supply to the plate stopped, the support (4) was placed on the plate cylinder (1).
Was fixed and rotated at one revolution per minute.

Next, a capillary (inner diameter: 20 μm, outer diameter: 50 μm) fixed at a distance of 0.5 mm from the support (4) and containing the ink composition for inkjet shown in Table 1
A laser beam was condensed and radiated so as to form a spot having a diameter of 20 μm on a side surface of 0.5 mm from the ink ejection port of a glass capillary (0 μm, length 30 mm). As a laser light source, a semiconductor laser of 830 nm and 30 mW (“HL825G” manufactured by Hitachi, Ltd.) was used.

Then, the power supply of the semiconductor laser is switched, and the laser light is repeatedly turned on and off for 500 μsec at 1 kHz for 500 μsec.
By scanning the capillary in the axial direction of the plate cylinder (1), an ink image was formed on the support (4) to obtain a printing plate. Thereafter, the ink image was thermally cured at 120 ° C. for 2 minutes by a post-curing device (8) arranged near the plate cylinder (1).

Next, the plate cylinder (1) and the blanket cylinder (2) are brought into contact with each other, the blanket cylinder (2) and the impression cylinder (3) are separated from each other, and the feeding of the paper to the impression cylinder (3) is stopped. The printing press was operated at 470 revolutions per hour, and a fountain solution of 10 ° C. (“Astro No-1 mark 2” manufactured by Niken Kagaku Co., Ltd. (concentration 1% by weight, p
H5) was supplied for 10 seconds, and a printing ink ("Hi-Echo Red" manufactured by Toyo Ink Co., Ltd.) was supplied for 2 seconds to perform a surface treatment of the printing plate.

Next, after the printing press was operated for 70 seconds in the above state, the blanket cylinder (2) and the impression cylinder (3) were rotated in contact with each other, and printing paper ("NPC Coat" manufactured by Nippon Paper Industries Co., Ltd.) was used. Was fed, and 100 sheets were printed to perform printing plate making. Then, when plate making was performed on a printing press, the number of print damaged sheets required until a complete printed image was obtained was measured. The number of print waste sheets was five.

[0057]

Table 1 <Ink jet ink composition> Light-to-heat conversion material (compound represented by the following (a)): 20 parts by weight Organic polymer substance (compound represented by the following (b): weight average molecular weight 7500) 80 parts by weight n-methylpyrrolidone (solvent) 400 parts by weight cyclohexanone (solvent) 500 parts by weight

[0058]

Embedded image

Example 2 In Example 1, a blanket cylinder (2) and an impression cylinder (3)
Just as in Example 1, except that the dampening solution and the printing ink on the printing plate were wiped off with a rag impregnated with a plate cleaner (“SK Plate Cleaner” manufactured by SK Liquid Manufacturing Co., Ltd.) immediately before contact rotation. Printing plate making. The number of print waste sheets was five.

Example 3 In Example 1, a blanket (2) cylinder and an impression cylinder (3)
Immediately before the contact rotation, the fountain solution and the printing ink on the blanket cylinder (2) were washed and removed by the cylinder cleaning mechanism (7) (ABC type manufactured by Baldwin) on the blanket cylinder (2). Printing prepress was performed in the same manner as in Example 1. The number of print waste sheets was five.

[0061]

According to the present invention described above, there is provided a plate making method and a printing method on an ink jet printing machine which can solve various problems of the conventional ink jet plate making by slightly modifying a commercially available lithographic printing machine. Has great industrial value.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an example of an apparatus used in one embodiment of the present invention.

FIG. 2 is a conceptual diagram of an example of an apparatus used in another embodiment of the present invention.

[Explanation of symbols]

 1: Plate cylinder 2: Blanket cylinder 3: Impression cylinder 4: Support body 5: Ink filling device 6: Dampening device 7: Cylinder cleaning mechanism 8: Post-curing device 9: Ink jet device 10: Support automatic supply unit

Claims (8)

[Claims] 1. A lithographic printing press having a printing unit comprising a plate cylinder, a blanket cylinder and an impression cylinder is used, and (AI) a support automatic on the lithographic printing machine is supplied from an ink jet apparatus arranged in the vicinity thereof. After the ink is scattered on the support fixed to the supply unit or the support fixed on the (AII) plate cylinder to form an ink image, the dampening water supply roller and the printing ink supply roller are operated, and the blanket cylinder is operated. And printing by feeding a printing paper while rotating the printing press and the impression cylinder in contact with each other. 2. A plate making step (AI) on a printing press during a printing step.
The method of claim 1, wherein 3. A printing plate making process (AII), wherein the dampening solution supply roller and the printing ink supply roller are separated from each other, and the paper supply to the impression cylinder is stopped. 2. The method of claim 1, wherein 4. An on-press plate making process (AI) or (AII)
Thereafter, in a state where the dampening solution supply roller and the printing ink supply roller are separated from each other between the cylinders, and further, the paper supply to the impression cylinder is stopped, (B) the printing plate obtained in the plate making process The method according to any one of claims 1 to 3, wherein the surface treatment agent is supplied from the surface treatment agent supply roller, and then (C) the plate cylinder and the blanket cylinder are rotated in contact with each other. 5. The method according to claim 4, wherein after supplying the surface treatment agent onto the printing plate, the printing plate and the surface treatment agent supply roller are separated from each other. 6. A blanket cylinder and a blanket cylinder are maintained in a separated state, the plate cylinder and the blanket cylinder are brought into a contact rotation state or a separated state, and a cylinder cleaning mechanism on the plate cylinder or the blanket cylinder is used to clean the plate cylinder and the blanket cylinder. The method according to claim 4 or 5, wherein the used surface treating agent is removed. 7. The method according to claim 4, wherein a printing ink, a fountain solution or a hydrophilizing agent is used as the surface treatment agent. 8. A plate making process (AI) or (AII) on a printing press.
The method according to any one of claims 1 to 7, wherein the entire surface of the ink image is light-cured or thermally cured after the printing.