JP2001219527A - On-board drawing planoglaphic printing method and on- board drawing planoglaphic printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a on-board drawing planographic printing method capable of corresponding to digital image data, capable of inexpensively printing a large number of printed matters each having a sharp image at a high speed and achieving a heating condition necessary for obtaining sufficient printind durability with respect to fixing by short-time heating. SOLUTION: In the on-board drawing planographic printing method wherein a plate material us mounted on the plate cylinder of a printing press and an image is directly formed on the plate material by an ink jet system for emitting ink containing an olelphilic component on the basis of a signal of image data and subsequently fixed by heating to form a printing plate and the plate material is used in this state to succeedingly perform planographic printing, the heating and fixing of the image is performed by a heating roller.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a lithographic printing method and a printing apparatus for performing digital plate making on an on-press drawing printer, and more particularly, to a lithographic printing method using an ink containing at least a lipophilic component and having good printing quality. The present invention relates to a plate making / printing method and a printing apparatus thereof.

[0002]

2. Description of the Related Art In lithographic printing, printing is performed by providing an ink receptive area and an ink repellent area on the surface of a printing plate corresponding to an image original, and attaching printing ink to the ink receiving area. Normally, hydrophilic and lipophilic (ink-receptive) regions are formed imagewise on the surface of the printing plate, and the fountain solution is used to make the hydrophilic region ink-repellent.

Recording an image on a printing original plate (plate material) (plate making)
Prints the image original in analog or digital form on a silver halide photographic film, and then exposes the diazo resin or photopolymerizable photopolymer photosensitive material on the printing original plate,
It is a general method to perform elution and removal of the non-image area mainly using an alkaline solution.

In recent years, in the lithographic printing method, due to the recent improvement in digital drawing technology and the demand for more efficient processes,
Many systems for directly drawing digital image information on a printing plate have been proposed. This is CTP (Computer-t
o-Plate) or DDPP (Digial Direct Printin)
g Plate). As a plate making method,
For example, there is a system for recording an image in a light mode or a heat mode by using a laser, and some of the systems have been put into practical use.

However, in this plate making method, in both the optical mode and the thermal mode, generally, after the laser recording, the plate is processed by dissolving and removing the non-image portion by treating with an alkaline developer to discharge the alkaline waste liquid. , Not preferable for environmental protection.

Further, there is a method using the above-mentioned laser, but it is expensive and large. Therefore,
Attempts have been made to apply a system using an inkjet method, which is an inexpensive and compact drawing apparatus.

Japanese Patent Application Laid-Open No. 64-27953 discloses a method of performing plate making by drawing with an ink jet using a lipophilic wax ink as a hydrophilic plate material.

Japanese Patent Application Laid-Open No. 11-70632 discloses a method of performing plate making by drawing an image on a hydrophilic plate material using an aqueous solution or aqueous colloidal dispersion of a hydrophobic organic acid salt by inkjet. Have been.

However, in the above-described method, it is necessary to manually place the plate material on the plate cylinder of the offset printing machine after performing the plate making. Are also prone to color misregistration.

Further, as a means for improving the efficiency of the printing process, there is a system for performing image drawing on a printing machine by applying an ink jet method. Japanese Patent Application Laid-Open No. Hei 4-97848 discloses a system for performing such image drawing on a printing press. In this method, a surface drum is provided with a hydrophilic or lipophilic plate drum in place of a conventional plate cylinder, and an lipophilic or hydrophilic image is formed thereon by an ink jet method, and the image formed in this manner is formed. , And after the printing is completed, the image is cleaned and removed. However, this method has a disadvantage in that it is difficult to achieve both removal of a printed image (that is, ease of cleaning) and printing durability.

The heat-fixing step performed after the image formation is an important step which affects the printing durability of the plate image, and is performed by a method of radiating and radiating heat rays using a conventionally used lamp heater, ceramic heater or the like. When heat fixing is performed, for example, 100 ° C.
For a long time of 20 sec.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the first object of the present invention is to provide a digitally compatible on-press drawing lithographic printing method which does not require a developing process, and It is to provide the printing device. Secondly, it is an object of the present invention to provide a lithographic printing method and a printing apparatus capable of printing a large number of prints of clear and high-quality images with an inexpensive apparatus and a simple method. Third, the heating can be achieved by heating for a short time to obtain sufficient printing durability, thereby increasing the processing speed of the fixing process and achieving space saving in the fixing process. It is to provide a fixing means.

[0013]

In order to achieve the above object, according to the invention of the on-press lithographic printing method according to claim 1 of the present application, a plate material is mounted on a plate cylinder of a printing press, and a signal of image data is provided. An image is formed directly on the plate material by an ink jet method in which an ink containing a lipophilic component is ejected based on, and then a printing plate is prepared by performing heat fixing, and the lithographic printing is continuously performed using the plate material in that state. In the on-press drawing lithographic printing method, the heating and fixing are performed by a heater. According to the second aspect of the present invention, dust existing on the plate material surface is removed before and / or during drawing on the plate material by the ink jet method using a recording head, and / or at least plate making. It is characterized in that the recording head is cleaned after completion. Further, according to the invention of the on-press lithographic printing apparatus according to the third aspect, lipophilicity is used as a direct image forming means for directly forming an image based on a signal of image data on a plate material mounted on a plate cylinder of a printing press. An ink jet drawing apparatus having a recording head for discharging ink containing components, a heat fixing means for heating and fixing the image, and a lithographic printing means for performing lithographic printing on a printing plate heat-fixed by the heat fixing means. The on-press drawing printing apparatus is characterized in that the heat fixing means is a roller. Further, according to the invention of the on-press lithographic printing apparatus according to the fourth aspect of the present invention, there is provided a roller separating means for providing the roller in a detachable manner from the plate cylinder. The roller separating means operates so as to separate the roller from the plate cylinder except for the fixing step. According to the fifth aspect of the present invention, the direct image forming means includes a plate material surface dust removing means for removing dust present on the plate material surface before and / or during drawing on the plate material. It is characterized by that. And according to the invention of claim 6,
When drawing on the plate material, the direct image forming means performs main scanning by rotating a plate cylinder on which the plate material is mounted. According to the seventh aspect of the present invention,
The recording head includes a single-channel head or a multi-channel head, and performs sub-scanning by moving the recording head in the axial direction of the plate cylinder when drawing on the plate material. Further, according to the invention described in claim 8, the recording head comprises a full line head having a length substantially equal to the width of the plate cylinder. According to the ninth aspect of the present invention, the ink jet drawing apparatus brings the recording head close to the plate cylinder when drawing on the plate material, and moves the recording head to the plate except when drawing on the plate material. It is characterized in that a recording head separation / contact means for separating from the body is provided. According to a tenth aspect of the present invention, the direct image forming means includes a recording head cleaning means for cleaning the recording head at least after the completion of plate making. According to an eleventh aspect of the present invention, the lithographic printing means includes a paper dust removing means for removing paper dust generated during lithographic printing.

[0014]

Embodiments of the present invention will be described below in detail. The present invention is characterized in that an image is formed on a printing original plate (plate material) provided on a plate cylinder of a printing press by an inkjet method of discharging ink containing at least a lipophilic component. As the inkjet method according to the present invention, any method can be used as long as an ink containing a lipophilic component can be ejected.

More specifically, for example, “Imaging part 2 Latest Hard Copy Printer Technology” edited by the Society of Electrophotography, Chapter 3 Photographic Industry Publishing Company (1988), edited by Hiroshi Komon “Recording and Storage Technology Handbook”, Maruzen Co., Ltd. 19
1992), etc., which can be used, such as a piezo method, a thermal jet method, an electrostatic method, and a discharge method. Also, JP-A-10-175300, JP-A-6-175300
-23986, JP-A-5-131633,
JP-A-10-114073, JP-A-10-349
No. 67, JP-A-3-104650, JP-A-8
A system in which these are applied or combined, such as Japanese Patent Publication No. 300803, is also preferably used. As described above, according to the present invention, by performing plate making on a printing machine by an ink jet method, it is possible to print a large number of clear and high-quality printed images with an inexpensive apparatus and a simple method.

An example of the configuration of an on-press lithographic printing apparatus used for carrying out the lithographic printing method of the present invention will be described below. FIGS. 1 to 3 show the overall configuration of an on-machine drawing single-color single-sided lithographic printing apparatus according to the present invention. FIG. 4 shows a heat roller and a plate which are specific examples of the fixing apparatus 5 in FIGS. It is a block diagram which shows the positional relationship of a trunk | drum. FIG. 5 is a schematic configuration example of a drawing unit including a control unit, an ink supply unit, and a head separation / contact mechanism of the on-press lithographic printing apparatus of FIGS. FIG. 6 shows a head protection cover as a specific example of the head protection means. FIGS. 7 and 8 show examples of an ink jet recording apparatus provided in the on-press lithographic printing apparatus shown in FIGS. 1 and 9. FIG. 9 shows an overall configuration example of an on-press four-color single-sided lithographic printing apparatus according to the present invention.

First, the printing process according to the present invention will be described with reference to the overall configuration diagram of an on-press drawing single-color single-sided lithographic printing press shown in FIG. As shown in FIG. 1, an on-press lithographic printing apparatus 1 (hereinafter, referred to as a “printing apparatus”) has a plate cylinder 11, a blanket cylinder 12, and an impression cylinder 13 one by one, and performs at least lithographic printing. Is arranged such that a blanket cylinder 12 for transfer is pressed against the plate cylinder 11, and an impression cylinder 13 for transferring the printing ink image transferred to the blanket cylinder 12 to the printing paper P is pressed against the blanket cylinder 12. Are arranged as follows. FIG. 2 shows another configuration example of the printing apparatus according to the present invention. The printing apparatus is entirely covered with a hood F. The hood F has an intake port I and an exhaust port O, and the intake port I and the exhaust port O have a dustproof filter (not shown).
Is installed. It is desirable to provide a fan or the like in the hood in order to forcibly intake and exhaust air. Further, a solvent vapor removing device may be attached so as to prevent the solvent vapor used for the ink described below from being emitted to the outside of the hood. This eliminates the need to discharge the solvent vapor to the outside and eliminates problems such as generation of odor. It can be a good printing device. Although the entire printing apparatus is covered with the hood F in FIG. 2, the hood may cover only a part of the printing apparatus as shown in FIG. 3, and the present invention is not limited to this embodiment.

The plate cylinder 11 is usually made of metal, and its surface is coated with, for example, chrome to enhance abrasion resistance. As shown in FIG. 4, the plate cylinder 11 has a heat insulating material 11a on its surface. Is also good. The plate material 9 for forming an image is mounted on the heat insulating material 11a. According to the present invention, this image fixing device is constituted by a heat roller 5 'as shown in FIG. This will be described later.

When an electrostatic ink jet is used, the plate cylinder 11 is preferably grounded because it serves as a counter electrode of the discharge head electrode. If the substrate of the plate material has a high insulating property, a conductive layer may be provided on the substrate. In this case, it is desirable to provide a means for grounding the plate cylinder from the conductive layer. In that case, a known means such as a brush, a leaf spring, or a roller having conductivity can be used.

Further, the printing apparatus 1 has an ink jet recording apparatus 2, and the
In accordance with the image data sent from the printer, an ink containing a lipophilic component is ejected onto the plate material 9 mounted on the plate cylinder 11 to form an image portion.

Further, the printing apparatus 1 is provided with a dampening water supply device 3 for supplying dampening water to a hydrophilic portion (non-image portion) on the printing plate 9. FIG. 1 shows a Molton water supply system as a representative example of the dampening water supply device 3. However, as the dampening water supply device 3, other known devices such as a synflo water supply system and a continuous water supply system can be used. Further, the printing device 1
It has a printing ink supply device 4 and a fixing device 5 for strengthening the ink image drawn on the plate material 9. If necessary, a plate surface desensitizing device 6 may be provided for the purpose of enhancing the hydrophilicity of the surface of the plate material 9. Further, the printing apparatus 1 includes a dust removing unit 10 for removing dust existing on the surface of the plate material before or / and during drawing on the plate material. As the dust removing means, in addition to a known non-contact method such as suction removal, blowing removal, and electrostatic removal, a contact method using a brush, a roller, or the like can be used. Or a combination thereof. In this case, an air pump usually used for a paper feeding device can be used for this purpose.

Further, there is provided an automatic plate feeding device 7 for automatically supplying the plate material 9 to be printed onto the plate cylinder 11 and an automatic plate discharging device 8 for automatically removing the plate material 9 after printing from the plate cylinder 11. A printing press having this device, which may be installed and is known as an auxiliary device for the printing press, such as the Hamada VS3
4A, B452A (Hamada Printing Machinery Co., Ltd.), Toko 8000 PFA (Tokyo Aviation Instruments), Ryobi 32
00ACD, 3200 PFA (Ryobi Magics Co., Ltd.), AMSIS Multi 5150FA (Nippon Am Co., Ltd.), Oliver 266EPZ (Sakurai Graphic Systems Co., Ltd.), Shinohara 66IV / IVP (Shinohara Shoji Co., Ltd.) and the like. Further, a blanket cleaning device 14 and an impression cylinder cleaning device 14 'may be provided. By using these automatic plate feeding device 7, automatic plate discharging device 8, and both cleaning devices 14, 14 ', the printing operation becomes simpler and the printing time is shortened, so that the effect of the present invention is further enhanced. Enhanced. In addition, it is preferable to install a paper dust generation prevention device 15 near the impression cylinder 13, so that paper dust adhering to the plate material can be prevented. As the paper dust generation preventing device 15, a method such as humidity control, suction by air or electrostatic force, or the like can be used.

The image data arithmetic control unit 21 receives image data from an image scanner, a magnetic disk device, an image data transmission device, etc., performs color separation, and has an appropriate number of pixels and gradation for the separated data. Divide into numbers. Further, the dot area ratio is also calculated in order to draw the ink image using the ink jet ejection head 22 (see FIG. 5 and described in detail later) included in the ink jet recording apparatus 2.

As will be described later, the image data calculation control unit 21 controls the movement of the ink jet ejection head 22 and the ejection timing of the ink and, if necessary, the plate cylinder 11, blanket cylinder 12, impression cylinder 13 The operation timing is controlled.

With reference to FIGS. 1 to 3 and a part of FIG. 5, a printing plate making process by the printing apparatus 1 will be described in detail below.

First, the plate material 9 is mounted on the plate cylinder 11 by using the automatic plate feeding device 7. At this time, the plate material is closely fixed on the plate cylinder by a mechanical method using a known plate head / butt holding device, an air suction device, or the like, or an electrostatic method. It is possible to prevent the ink jet recording apparatus 2 from being damaged by contact with the ink jet recording apparatus 2. Further, a means for bringing the plate material into close contact with the plate cylinder only around the drawing position of the ink jet recording apparatus is provided, and at least at the time of drawing, the plate material can be prevented from coming into contact with the ink jet recording apparatus by acting. . Specifically, for example, there is a method of disposing a pressing roller upstream and downstream of the plate cylinder drawing position. In addition, in the process of fixing the printing plate, by providing a printing plate non-contact means for preventing the printing plate from contacting the ink supply roller, it is possible to prevent the printing plate from being stained and to reduce waste paper. Specifically, a pressing roller, a guide, electrostatic attraction, or the like is effective.

Image data from a magnetic disk device or the like
The image data calculation control unit 21 calculates the ejection position of the ink containing the lipophilic component and the dot area ratio at that position in accordance with the input image data. These calculation data are temporarily stored in the buffer. The image data calculation control unit 21 rotates the plate cylinder 11 as shown in FIG. 5, and moves the discharge head 22 to a position close to the plate cylinder 11 by the head separation / contact device 31.
The distance between the ejection head 22 and the surface of the plate material 9 on the plate cylinder 11 is:
A predetermined distance is maintained during drawing by mechanical distance control such as a contact roller or control of a head separation / contact device by a signal from an optical distance detector. As the ejection head 22, a single-channel head, a multi-channel head, or a full-line head can be used, and the main scanning is performed by rotating the plate cylinder 11. In the case of a multi-channel head having a plurality of discharge units or a full line head, the arrangement direction of the discharge units is set in the axial direction. Further, in the case of a single-channel head or a multi-channel head, the head 22 is moved in the axial direction of the plate cylinder by one rotation of the plate cylinder 11 by the image data calculation control unit 21 so that the ejection position obtained by the above calculation is obtained. The ink is discharged onto the plate material 9 mounted on the plate cylinder 11 at a dot area ratio. As a result, a halftone dot image corresponding to the density of the print document is drawn on the plate material 9 with ink. This operation is continued until an ink image for one color of the printing original is formed on the plate material 9 and the printing plate is completed. On the other hand, when the discharge head 22 is a full line head having a length substantially equal to the width of the plate cylinder, an ink image for one color of a print document is formed on the plate material 9 by one rotation of the plate cylinder. A version is completed. By performing the main scanning by rotating the plate cylinder in this manner, the position accuracy in the main scanning direction can be improved, and high-speed drawing can be performed.

Next, in order to protect the ejection head 22,
Except during drawing, the discharge head 22 is retracted away from a position close to the plate cylinder 11. At this time, only the ejection head 22 may be separated and contacted, but the ejection head 22 and the head sub-scanning means 32 may be separated and connected together, or the ejection head 22 and the ink supply unit 24 and all of the head sub-scanning means 32 may be separated together. You can also touch. In addition to the ejection head 22, the ink supply unit 24, and the head sub-scanning unit 32, the fixing device 5 and the dust removing unit 10 are also provided with separating / contacting means, respectively, so that they can be retracted and made available.

This separation / contact means operates so as to separate the recording head from the plate cylinder by at least 500 μm except during drawing. The detachment operation may be a slide type, or the head may be fixed by an arm fixed to a certain axis, and the arm may be moved around the axis to move like a pendulum. By retracting the head during non-drawing in this manner, the head can be protected from physical damage or contamination, and a long life can be achieved.

Further, the formed ink image is transferred to a fixing device 5.
Strengthened by heating. The present invention is characterized in that heat roller heating is employed as a fixing means for ink. The heat-fixing step performed after image formation is an important step that affects the printing durability of the plate image, but heat-fixing was performed by a conventional method of radiating heat rays using a lamp heater, ceramic heater, etc. and radiant heating. In this case, long-time heating at 100 ° C. for 20 seconds was necessary to obtain sufficient printing durability. On the other hand, when the heat roller heating of the present invention is applied, a melting effect by heating and a pressing effect by pressure act on the ink of the printing plate image, so that the heating condition necessary to obtain sufficient printing durability is 80. °
C was found to be good in a short time of only 1 sec.
This makes it possible to improve the processing speed of the fixing step and to save space in the fixing step.

The printing process after the printing plate is formed is the same as the known lithographic printing method. That is, printing ink and dampening water are applied to the plate material 9 on which the ink image containing the lipophilic component is drawn to form a print image, and the print ink image is formed on the blanket cylinder 12 rotating together with the plate cylinder 11. Then, the printing ink image on the blanket cylinder 12 is transferred onto the printing paper P passing between the blanket cylinder 12 and the impression cylinder 13 to print one color. After the printing is completed, the plate material 9 is removed from the plate cylinder 11 by the automatic plate discharging device 8, and the blanket on the blanket cylinder 12 is cleaned by the blanket cleaning device 14 to be ready for the next printing.

Reference numeral 20a denotes digital control means provided for further improving the operability of the on-press lithographic printing apparatus 1 of the present invention.
Plate inspection devices and the like can be mentioned. The ink usage amount display device displays the required amount of ink in advance based on image data, and is very effective when performing plate making continuously as in the printing apparatus 1. In addition, since this apparatus performs on-machine drawing, plate inspection cannot be performed. This plate inspection device compensates for the disadvantage. That is, an image drawn on the plate is detected by a CCD camera or the like installed in the machine, and the plate is displayed on a monitor to enable plate inspection. At this time, it is also possible to further improve the plate inspection property by digital processing as compared with the case of visual observation.

Next, the ink jet recording apparatus 2 will be described in detail with reference to FIG.

As shown in FIG. 5, the planographic printing apparatus 1
The drawing unit used for the
The head protection unit 20 b includes an ink supply unit 24. The head protection means 20b includes (1) means for preventing foreign matter from adhering to the head, and (2) means for stopping drawing when an abnormality occurs. (1) As a foreign matter adhesion preventing means, for example, there is a head protection cover or the like. That is, when drawing is not performed, the head can be stored in the cover to prevent foreign matter from adhering. FIG. 6 shows an embodiment of the cover according to the present invention. The head 22 is stored in a cover 51 with a shutter 52 as shown in FIG.
2 is opened, and the head 22 is advanced to the drawing position to perform drawing. The inside of the cover 51 can be filled with ink or an ink solvent. In this case, even if drawing is not performed for a long time, trouble due to sticking of the ink to the head 22 can be prevented. (2) As an abnormal occurrence drawing stop means, for example, a dust sensing device or an abnormal current sensing device of the head is connected to the image data arithmetic control unit 21, and when an abnormal signal is generated from the device, the head is connected to the head. By providing a mechanism for stopping the voltage signal, damage to the head can be prevented.

On the other hand, the ink supply section 24 has an ink tank 25, an ink supply device 26, and an ink density control means 29. The ink tank 25 may include a stirring unit 27 and an ink temperature management unit 28 as necessary. In this case, the stirring means 27 suppresses precipitation and aggregation of the solid components of the ink. Further, the ink temperature management means 28 is arranged such that a high-quality image can be stably formed without changing the physical properties of the ink due to a change in ambient temperature and without changing the dot diameter. In order to perform high-quality drawing, an ink density control unit 29 is provided as necessary. The ink density is measured by optical detection, physical property measurement such as conductivity measurement, viscosity measurement, or the like, or management based on the number of drawn images. When performing management by physical property measurement, an optical detector, conductivity meter, and viscosity meter are provided alone or in combination in the ink tank or ink flow path, and management based on the output signal and the number of drawn sheets is performed. When this is done, the supply of liquid from the replenishment concentrated ink tank or the dilution ink carrier tank (not shown) to the ink tank is controlled based on the number and frequency of plate making.

As described above, the image data calculation control section 21 calculates the input image data, moves the head by the head separation / contact device 31 or the head sub-scanning means 32, and Installed encoder 3
The timing pulse from 0 is taken in, and the head is driven according to the timing pulse. This allows
Position accuracy in the sub-scanning direction can be improved. The image data calculation control unit 21 further controls the above-described head protection unit 20b. When drawing by the ink jet recording apparatus, the position accuracy in the sub-scanning direction can be enhanced by using a high-precision driving means different from the driving means for printing. It is desirable that only the plate cylinder 11 be driven by being mechanically separated from the cylinder 12, the impression cylinder 13, and others. Specifically, for example, there is a method in which the output from a high-precision motor is reduced by a high-precision gear or a steel belt or the like, and only the plate cylinder 11 is driven. When performing high-quality drawing, such high-precision driving means is used alone or in combination.

The head 22 may include a maintenance device such as a cleaning unit, if necessary. For example, when the hibernation state continues or when there is a problem with the image quality, the tip of the ejection head has a flexible brush, brush,
A good drawing state can be maintained by performing means such as wiping with a cloth or the like, circulating only the ink solvent, or supplying or circulating only the ink solvent and sucking the discharge portion alone or in combination. In order to prevent the ink from sticking, it is effective to cool the head and suppress evaporation of the ink solvent. If the contamination is further severe, the ink is forcibly sucked from the ejection section, the jet of air, ink, or ink solvent is forcibly injected from the ink flow path, or the ultrasonic wave is applied while the head is immersed in the ink solvent. Is also effective, and these methods can be used alone or in combination.

Next, an on-press drawing multicolor planographic printing press will be described as a specific example of the present invention. FIG. 9 is an example of the overall configuration of an on-press 4-color single-sided lithographic sheet-fed printing press. As shown in FIG. 9, the four-color single-sided printing apparatus is basically a plate cylinder 11, a blanket cylinder 12, and an impression cylinder 1 of the single-color single-sided printing apparatus shown in FIG.
3 are provided so that four are printed on the same surface of the printing paper P. Although not shown,
In the transfer of the printing paper indicated by K in the drawing between adjacent impression cylinders,
A known transfer cylinder method or the like is used. Although a detailed description is omitted, as can be easily imagined from the example of FIG. 9, the other multicolor single-sided printing apparatuses basically use the printing paper P for the plate cylinder 11, blanket cylinder 12, and impression cylinder 13 of the single-color single-sided printing apparatus. In the case where only one color plate is formed on the plate cylinder, the plate cylinder and blanket cylinder are provided for the number of colors to be printed. (Such a printing apparatus is referred to as a unit-type printing apparatus.) On the other hand, common impression cylinder printing that shares one impression cylinder having a diameter that is an integral multiple of the plate cylinder diameter with respect to plate cylinders and blanket cylinders for a plurality of colors. When the present invention is implemented in an apparatus, a plate cylinder for the number of colors to be printed, or a structure in which one blanket cylinder shares one impression cylinder may be used,
A structure in which a plurality of plate cylinders and blanket cylinders for a plurality of colors share a single impression cylinder, and the total number of plate cylinders and blanket cylinders is equal to the number of colors to be printed may be employed. In this case, the transfer of the printing paper between the adjacent common impression cylinders uses the known transfer cylinder method or the like. On the other hand, when a plate of a plurality of colors is formed on a plate cylinder, a plate cylinder and a blanket cylinder are required by a value obtained by dividing the number of colors to be printed by the number of plates on one plate cylinder. For example, when plate materials for two colors are prepared on a plate cylinder, four-color printing on one side can be performed by a printing machine having two plate cylinders and two blanket cylinders. In this case, the impression cylinder diameter is the same as the plate cylinder diameter for one color, and the impression cylinder is provided with means for holding printing paper until printing of the required color is completed, if necessary. For the delivery of the printing paper, a known transfer cylinder method or the like is used. For example, in the case of a printing press having two plate cylinders and two blanket cylinders each of which creates a plate material for the two colors described above, two-color printing is performed when one of the impression cylinders holds the printing paper and rotates twice,
Next, the printing paper is transferred between the impression cylinders. Next, when the other impression cylinder holds the printing paper and makes two rotations, two-color printing is further performed to complete four-color printing. The number of impression cylinders may be the same as the number of plate cylinders. However, several impression cylinders and blanket cylinders may share one impression cylinder.

On the other hand, when the present invention is embodied as an on-press drawing multicolor double-sided lithographic printing machine, a known printing paper reversing means may be provided between at least one adjacent impression cylinder of the unit-type printing apparatus. A structure in which a plurality of the above-described common impression cylinder type printing apparatuses are arranged and a known printing paper reversing means is provided between at least one adjacent impression cylinder, or the plate cylinder 11 and the blanket cylinder 12 of the single-color single-sided printing apparatus shown in FIG. Are printed on both sides of the printing paper P. In the latter structure, when only one color plate is formed on the plate cylinder, printing is performed on both sides of the printing paper. It has plate cylinders and blanket cylinders for the number of colors required for printing. On the other hand, when a plurality of color plates are formed on the plate cylinder as described above, the number of plate cylinders, blanket cylinders, and impression cylinders can be reduced. Further, when one plate cylinder is shared by several plate cylinders and blanket cylinders, the number of impression cylinders can be further reduced. The plate cylinder is provided with a means for holding printing paper until printing of a required color is completed, if necessary. The details are omitted because they can be easily analogized by the above-described example of the on-press drawing multicolor single-sided lithographic printing press.

The example of the sheet-fed printing press has been described as an embodiment of the on-press drawing multicolor lithographic printing press of the present invention. On the other hand, when the present invention is implemented as an on-press drawing multicolor WEB (rolled paper) lithographic printing press, the above-described unit type and common impression cylinder type can be suitably used. In the case where the present invention is embodied as an on-press drawing multicolor WEB (winding paper) double-sided printing machine, a structure in which a known web reversing means is provided between at least one adjacent impression cylinder in both the unit type and the common impression cylinder type. And a structure having a plurality of printing papers P so that printing is performed on both sides. The BB (blanket-to-blanket) type is the most suitable as an on-press drawing multicolor WEB (winding paper) double-side printing machine. This is a one-color plate cylinder for printing one side of the web, a blanket cylinder (without an impression cylinder) and a one-color plate cylinder for printing the other side, a blanket cylinder (also without an impression cylinder). Have a structure in which the blanket cylinders are pressed against each other during printing for the number of colors.
By passing the EB, multi-color double-sided printing is achieved.

As another example of an on-press lithographic printing press, one blanket cylinder has two plate cylinders, and when printing is being performed, drawing can be performed with the other plate cylinder. . In this case, it is desirable that the drive of the plate cylinder performing drawing is mechanically independent of the blanket. This makes it possible to perform drawing without stopping the printing press. As can be easily analogized, this can be applied to an on-press drawing multicolor single-sided lithographic printing press and an on-press drawing multicolor double-sided lithographic printing press.

Although not described in order to avoid duplication, the hood, the digital control means and the head protection means are appropriately used in all the printing apparatuses to improve the operability of the printing apparatuses.

Next, the plate material (printing plate) used in the present invention will be described.

Examples of the plate material include metal plates such as aluminum and chrome-plated steel plates. In particular, graining,
An aluminum plate having excellent water retention and abrasion resistance on the surface by anodizing treatment is preferable. As an inexpensive plate material, a plate material provided with an image receiving layer on a water-resistant support such as water-resistant paper, plastic film or plastic-laminated paper can be used. The thickness of this plate material is 100 to 3
The thickness of the image receiving layer is suitably in the range of 5 to 30 m.

As the image receiving layer, a hydrophilic layer comprising an inorganic pigment and a binder or a layer which can be made hydrophilic by a desensitizing treatment can be used.

As the inorganic pigment used in the hydrophilic image receiving layer, clay, silica, calcium carbonate, zinc oxide, aluminum oxide, barium sulfate and the like can be used. Further, as a binder, polyvinyl alcohol, starch,
Hydrophilic binders such as carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, polyacrylate, polyvinylpyrrolidone, and polymethylether-maleic anhydride copolymer can be used. If necessary, a melamine formalin resin, a urea formalin resin, or another crosslinking agent for imparting water resistance may be added.

On the other hand, examples of the image receiving layer used after the desensitization treatment include a layer using zinc oxide and a hydrophobic binder.

The zinc oxide to be used in the present invention may be, for example, zinc oxide, zinc white, or zinc oxide, as described in "Pigment Handbook" edited by Japan Pigment Technical Association, page 319, Seibundo Co., Ltd. (1968). Any of those commercially available as wet zinc white or activated zinc white may be used.

That is, depending on the starting materials and the production method, zinc oxide is classified into a dry method, a French method (indirect method), an American method (direct method) and a wet method. For example, Shodo Chemical Co., Ltd. Chemical Co., Ltd., Hakusui Chemical Co., Ltd.,
Examples include those commercially available from Honjo Chemical Co., Ltd., Toho Zinc Co., Ltd., and Mitsui Kinzoku Kogyo Co., Ltd.

Specific examples of the resin used as the binder include styrene copolymers, methacrylate copolymers,
Examples include an acrylate copolymer, a vinyl acetate copolymer, polyvinyl butyral, an alkyd resin, an epoxy resin, an epoxy ester resin, a polyester resin, and a polyurethane resin. These resins may be used alone or 2
More than one species may be used in combination.

The content of the resin in the image receiving layer is preferably from 9/91 to 20/80 in terms of resin / zinc oxide weight ratio.

Desensitization of zinc oxide is carried out by a conventional method using a desensitizing solution. Conventionally, as this type of desensitizing solution, a cyanide compound containing a ferrocyan salt or a ferricyan salt as a main component has been used. Containing treatment solution, ammine cobalt complex,
Phytic acid and its derivatives, a cyanide-free treatment liquid containing guanidine-derived isomer as a main component, a treatment liquid containing an inorganic acid or an organic acid that forms a chelate with zinc ions as a main component,
Alternatively, a treatment liquid containing a water-soluble polymer is known.

For example, as a cyanide-containing treatment solution,
JP-B-44-9045 and JP-B-46-39403, JP-A-52-76101 and JP-A-57-1078.
Nos. 89, 54-117201 and the like.

The surface of the plate material opposite to the image receiving layer is
The Beck smoothness is preferably in the range of 150 to 700 (sec / 10 cc). As a result, the formed printing plate does not shift or slip on the plate cylinder even during printing,
Good printing is performed.

Here, the Beck smoothness can be measured by a Beck smoothness tester. A Beck smoothness tester is a tester that applies a test piece at a constant pressure (1 kgf / cm ² , 9.8 N) on a highly smooth finished circular glass plate with a hole in the center.
/ Cm ² ) and measure the time required for a fixed amount (10 cc) of air to pass between the glass surface and the test piece under reduced pressure.

The lipophilic component contained in the ink of the present invention is preferably a hydrophobic resin or wax having a good affinity for the ink solvent. The hydrophobic resin may be dissolved in the ink solvent or may be dispersed as a solid.

When a resin is used as the lipophilic component, the resin has a weight average molecular weight Mw of 1 × 10 ² to 1 × 10 ⁶ , preferably 5 × 10 ² to 8 × 10 ⁵ , more preferably 1 × 10 ⁵ . × 10 ^{3 to} 5 × 10 ⁵ .

Specific examples of such resins include olefin polymers and copolymers (eg, polyethylene, polypropylene, polyisobutylene, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, ethylene-methacrylate copolymer). , Ethylene-methacrylic acid copolymer, etc.), vinyl chloride polymer and copolymer (for example,
Polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, etc.), vinylidene chloride copolymer, vinyl alkanoate polymer and copolymer, allyl alkanoate polymer and copolymer, styrene and its derivatives Polymers (eg, butadiene-styrene copolymer, isoprene-styrene copolymer, styrene-methacrylate copolymer, styrene-acrylate copolymer, etc.), acrylonitrile copolymer, methacrylonitrile copolymer, alkyl vinyl ether copolymer Coalesce, acrylate polymer and copolymer, methacrylate polymer and copolymer, itaconic diester polymer and copolymer, maleic anhydride copolymer, acrylamide copolymer, methacrylamide copolymer, Phenol resin, alkyd resin, polycarbonate Resin, ketone resin, polyester resin, silicone resin, amide resin, hydroxyl- and carboxyl-modified polyethyl resin, butyral resin, polyvinyl acetal resin, urethane resin, rosin resin, hydrogenated rosin resin, petroleum resin, hydrogenated petroleum resin, Maleic acid resin, terpene resin, hydrogenated terpene resin, cumarone-indene resin, cyclized rubber-methacrylic acid ester copolymer, cyclized rubber-acrylic acid ester copolymer, copolymer containing nitrogen-free heterocycle Polymers (for example, heterocycles such as a furan ring, a tetrahydrofuran ring, a thiophene ring, a dioxane ring, a dioxofuran ring, a lactone ring, a benzofuran ring, a benzothiophene ring, and a 1,3-dioxetane ring), an epoxy resin, and the like.

The content of the dispersed resin in the ink of the present invention is preferably 0.5 to 20% by weight of the whole ink. When the content is low, problems such as a decrease in printing durability are likely to occur.On the other hand, when the content is high, a uniform dispersion is difficult to be obtained, and ink is easily clogged in a discharge head, and stable. It is difficult to obtain a proper ink discharge.

On the other hand, examples of the use of wax as a lipophilic component include compounds used in solid ink jet printing, which are described in JP-A-2-69282,
JP-A-5-186723, JP-A-6-20636
8, US Pat. No. 3,653,932, 37
No. 15219, No. 4390369, No. 4
No. 484948, No. 4659383, No. 4684956, No. 4830671,
No. 4,889,560, No. 4,889,761, No. 4,992,304, No. 5,084,099, and PCT Publication No. WO 91/10711.

It is preferable that the ink used in the present invention contains a coloring material as a coloring component together with the lipophilic component for the purpose of plate inspection of a plate after plate making.

As the coloring material, any pigments and dyes conventionally used in ink compositions or liquid developers for electrophotography can be used.

As the pigments, those generally used in the technical field of printing can be used irrespective of inorganic pigments and organic pigments. Specifically, for example, carbon black, cadmium red, molybdenum red, chrome yellow, cadmium yellow, titanium yellow, chromium oxide, viridian, cobalt green, ultramarine blue, Prussian blue, cobalt blue, azo pigment, phthalocyanine pigment , Quinacridone-based pigments, isoindolinone-based pigments, dioxazine-based pigments, threne-based pigments, perylene-based pigments, perinone-based pigments, thioindigo-based pigments, quinophthalone-based pigments, metal complex pigments, and other known pigments. It can be used without.

As the dyes, azo dyes, metal complex dyes,
Naphthol dye, anthraquinone dye, indigo dye,
Dyes such as a carbonium dye, a quinone imine dye, a xanthene dye, an aniline dye, a quinoline dye, a nitro dye, a nitroso dye, a benzoquinone dye, a naphthoquinone dye, a phthalocyanine dye, and a metal phthalocyanine dye are preferred.

These pigments and dyes may be used alone or in an appropriate combination, but may be contained in the range of 0.01 to 5% by weight based on the whole ink. desirable.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. Example 1 An electrostatic multi-channel head described in WO93 / 11866 was used as an inkjet apparatus. In the ink jet method, an ink having a high resistance in which solid and hydrophobic charged resin particles are dispersed at least at normal temperature in an insulating solvent is used, and a strong electric field is applied to the ink at a discharge position. An aggregate of particles is formed at the discharge position, and the aggregate is discharged from the discharge position by electrostatic means. As the ink jet recording head used, a 100 dpi (top per inch) 64-channel ink jet head of the type shown in FIG. 7 was used. FIG. 8 shows the ink regulating plates 42 and 4 from FIG.
2 'has been removed. Here, a pump is used, and ink reservoirs are respectively provided between the pump and the ink inflow path (I) of the discharge head, and between the ink recovery path (O) of the discharge head and the ink tank. And stirring using a heater and the above-described pump is used as an ink temperature management means.
It was set to C and controlled by a thermostat. Further, the circulation pump was also used as a stirring means for preventing precipitation and aggregation here. In addition, an optical density measuring device was arranged in the ink flow path, and density control was performed by diluting the ink or feeding the concentrated ink based on the output signal.

Next, a production example of the hydrophobic resin particles for ink (PL-1) used in the present ink jet apparatus will be described. Production Example 1 Production of Resin Particles (PL-1) A mixed solution of 10 g of a dispersion stabilizing resin (Q-1) having the following structure, 100 g of vinyl acetate and 384 g of Isopar H was heated to a temperature of 70 ° C. while stirring under a nitrogen stream. . 2,2'-azobis (isovaleronitrile) as a polymerization initiator
0.8 g (abbreviation AIVN) was added and reacted for 3 hours. Twenty minutes after the initiator was added, cloudiness occurred and the reaction temperature rose to 88 ° C. In addition, 0.5 g of this initiator
After reacting for 2 hours, the temperature was raised to 100 ° C.
After stirring for an hour, unreacted vinyl acetate was distilled off. After cooling 2
After passing through a nylon cloth of 00 mesh, the obtained white dispersion was a latex having a degree of polymerization of 90% and an average particle diameter of 0.23 μm and having good monodispersibility. The particle size was measured with CAPA-500 (manufactured by Horiba, Ltd.).

[0068]

Embedded image

A part of the white dispersion was centrifuged (rotation speed: 1 × 10 4 rpm, rotation time: 60 minutes), and the precipitated resin particles were collected and dried. The weight average molecular weight (Mw: GPC value in terms of polystyrene) of the resin particles is 2
× 10 5, and the glass transition point (Tg) was 38 ° C.

Preparation of Oil-based Ink (IK-1) 10 g of a dodecyl methacrylate / acrylic acid copolymer (copolymerization ratio: 95/5 by weight), 10 g of nigrosine and 30 g of Shellsol 71 together with glass beads and a paint shaker ( (Manufactured by Tokyo Seiki Co., Ltd.) and dispersed for 4 hours to obtain a fine dispersion of nigrosine.

Preparation of Resin Particles for Ink 60 g (as solid content) of resin particles (PL-1) of Example 1, 2.5 g of the above nigrosine dispersion, FOC-1400 (tetradecyl alcohol, manufactured by Nissan Chemical Co., Ltd.) 15 g and octene-half-maleic acid hexadecylamide copolymer 0.0
A black oil-based ink was prepared by diluting 8 g to 1 liter of Isopar G.

Next, an on-press lithographic printing apparatus (FIGS. 1 to 3)
2) was filled in the ink tank with the oil-based ink (IK-1) prepared as described above. As a plate material, a 0.12 mm-thick aluminum plate subjected to graining and anodizing treatment was mounted with a plate head and a plate edge added by a mechanical device provided on a plate cylinder. Separate the dampening water supply device, the printing ink supply device, and the blanket cylinder so that they do not come into contact with the plate material, remove the dust on the plate material surface by suctioning with an air pump, and then move the discharge head close to the plate material to the drawing position and print. The image data to be transmitted to the image data arithmetic control unit, and the 64-channel ejection head was moved while rotating the plate cylinder, thereby ejecting ink containing a lipophilic component onto the aluminum plate to form an image. At this time, the tip width of the ejection electrode of the inkjet ejection pad is 10
μm, and the distance between the head and the plate material was controlled to be always 1 mm according to the output from the optical gap detection device. A voltage of 2.5 KV is constantly applied as a bias voltage, and when performing ejection, a pulse voltage of 500 V is further superimposed, and the pulse voltage is 256 steps within a range of 0.2 ms to 0.05 ms. The drawing was performed while changing the area of the dot by changing. No drawing failure due to greeting was observed at all, and no image deterioration due to a change in dot diameter was observed even when the outside air temperature changed or the number of plate making increased, and good plate making was possible.

In order to protect the ink jet discharge head, the ink jet recording apparatus is retracted by 50 mm from a position close to the plate cylinder together with the sub-scanning means, and the image is heated by fixing with a heat roller (Teflon seal silicon rubber roller including a 300 W halogen lamp) according to the present invention. And made a printing plate. In this case, the fixing conditions are as follows: heat roller temperature 160 ° C., plate cylinder transport speed (peripheral speed)
When the pressure (nip pressure) of the heat roller against the plate cylinder was 0.55 MPa at 6 mm / s, the temperature reached by the plate material reached 80 ° C. in one second. Then, as described above,
Printing on coated printing paper was performed by a normal lithographic printing method. That is, a printing image is formed by applying a printing ink and a fountain solution, the printing ink image is transferred onto a rotating blanket cylinder together with the plate cylinder, and then a printing coat passing between the blanket cylinder and the impression cylinder. The printing ink image on the blanket cylinder was transferred onto the paper.

The obtained printed matter was an extremely clear image with no jumping or blurring of the printed image up to 10,000 sheets.

Further, for 10 minutes after the completion of the plate making, the isoper G is supplied to the head, the isoper G is dropped from the head opening, and the head is stored in a cover filled with the vapor of the isoper G. By doing so, good printed matter could be produced for three months without the need for maintenance work.

Further, the printing durability was verified under various fixing conditions. Table 1 shows the relationship between the nip pressure and the roller temperature and the plate surface temperature, Table 2 shows the relationship between the peripheral speed and the plate surface temperature, and Table 3 shows the relationship between the roller temperature and the printing durability. Table 4 shows the relationship between nip pressure and printing durability, and Table 5 shows the relationship between heating time and printing durability.

[0077]

[Table 1]

As shown in Table 1, the relationship between the roller temperature and the plate surface temperature was confirmed to be about 1/3 to 2/3 of the roller temperature reaching the plate surface. The range of the roller temperature is preferably about 40 ° C to 150 ° C.
The temperature is preferably from 80 ° C. to 250 ° C., and the plate surface temperature is 50 ° C.
100 ° C or more and 190 ° C if limited to ~ 120 ° C
The following is more preferred. Although the change in the plate surface temperature due to the change in the nip pressure is small, the range of the nip pressure is 0.05 Mpa or more in consideration of the pressure resistance and transportability of the plate material and the ink.
5 Mpa or less, more preferably 0.1 Mpa or more and 20 M
pa or less.

[0079]

[Table 2]

As shown in Table 2, the plate surface temperature was 5
It was confirmed that it was almost constant from mm / sec to 20 mm / sec. The range of the peripheral speed is a preferable plate surface temperature of 40.
0.5 ° C / sec at about 150 ° C
It is preferably at least 150 mm / sec, and more preferably at a plate surface temperature of 50 ° C to 120 ° C, more preferably 1.0 mm / sec to 100 ° C.
mm / sec or less.

[0081]

[Table 3]

As shown in Table 3, when focusing on the relationship between the roller temperature and the printing durability, when the nip pressure is 0.55 Mpa and the peripheral speed is 5.3 mm / sec, good printing performance is obtained at a roller temperature of 130 ° C. or higher. (10000 sheets or more), a nip pressure of 0.55 Mpa, and a peripheral speed of 10.6 mm /
In sec, good printing durability was obtained at a roller temperature of 100 ° C. or higher. Therefore, the range of the roller temperature is 100 ° C.
It is confirmed that the above is preferable, and further considering the various peripheral speeds, the roller temperature is preferably 130 ° C. or more.

[0083]

[Table 4]

As shown in Table 4, when focusing on the relationship between the nip pressure and the printing durability, when the peripheral speed is 5.3 mm / sec and the roller temperature is 160 ° C., the nip pressure is approximately 0.1 Mpa or more, and the nip pressure is almost excellent. Printability (5,000 sheets or more) is obtained,
In addition, good printing durability (10,000 sheets or more) was obtained at a nip pressure of 0.55 MPa or more. Therefore, it was confirmed that a nip pressure of 0.1 Mpa or more is preferable, and a nip pressure of 0.55 Mpa or more is more preferable, in order to obtain substantially good printing durability.

[0085]

[Table 5]

As shown in Table 5, focusing on the relationship between the heating time and the printing durability, good printing durability can be obtained with a heating time of 1 second at a nip pressure of 0.55 Mpa and a plate surface temperature of 82 ° C. . On the other hand, as a comparative example, in the conventional heating at a plate surface temperature of 100 ° C., a heating time of 20 seconds was required to obtain 1,000 sheets. Therefore, good printing durability can be obtained with a shorter heating time than before, even though the plate surface temperature is lower than before. From the above results, it is possible to directly heat the plate material by using the heat roller, so that the heating efficiency is improved and the size of the fixing device can be reduced. Further, by injecting the molten ink on the plate material, the fixing property is improved, so that the fixing time can be shortened.

As described above, from the relationship between the pressure of the heat roller against the plate cylinder and the printing durability, the heat roller temperature 130
At ＣC and a peripheral speed of the plate cylinder of 10.6 mm / s, the nip pressure is suitably 0.05 MPa or more and 25 MPa or less, more preferably 0.1 MPa or more and 20 MPa or less, and more preferably 0.5 MPa or more. Printing performance was obtained. The relationship between the heat roller temperature and the printing durability was as follows: when the peripheral speed of the plate cylinder was 10.6 mm / s, and the pressure of the heat roller against the plate cylinder was 0.55 MPa, the heat roller temperature was 80 ° C.
Not less than 250 ° C., preferably 100 ° C.
Good printing durability was obtained at C or higher, more preferably at 130 ° C or higher. The peripheral speed of the plate cylinder is 0.5 mm / sec.
It is appropriate that the thickness is not less than c and not more than 150 mm / sec, more preferably not less than 1 mm / sec and not more than 100 mm / sec. The ultimate temperature of the plate material was 1/3 to 2/3 of the set temperature of the heat roller. Although the heat roller used here is a Si rubber roller. In addition, even when a fluorine rubber roller or a rubber roller whose surface was covered with a fluororesin sheet having a thickness of 400 μm was used, satisfactory fixing could be performed. Further, rubber rollers other than the rubber materials listed here can also be suitably used. Further, the above conditions may be appropriately combined depending on the ink material, the heating means, the fixability of the hydrophilic layer of the plate material, the material of the support, and the like. The plate surface temperature is 40 ° C. or more and 150 ° C. or less, more preferably 5 ° C. or less.
It is preferable that the temperature is selected to be not less than 0 ° C and not more than 120 ° C.

Further, the roller constituting the fixing device 5 is provided so as to be detachable from the plate cylinder by means of the roller separating means, and in the fixing step, the roller is separated from the plate cylinder. The roller can be brought into contact with the plate cylinder by means. However, if the heater is kept away from the plate cylinder except for the fixing step, there is no danger of contact with other parts, and it is safe.

Example 2 A commercially available solid ink jet device (Phaser 340 manufactured by Sony Techtronics) was used as the ink jet device.
The drawing unit of J) was used. As described above, a 0.12 mm-thick aluminum plate subjected to graining and anodizing was mounted as the plate material. After removing dust from the surface of the plate by suction with an air pump, the wax ink is in a molten state, and the discharge head that is ready for discharge is controlled to a distance of 2 mm from the plate by the output from the optical gap detector. Then, the image data to be printed was transmitted to the image data arithmetic control unit, and the 64-channel ejection head was moved while rotating the plate cylinder, thereby ejecting wax ink onto the aluminum plate to form an image. At the time of ejection, drawing was performed using the error diffusion method with binary values of 600 dpi using image data. No defective drawing due to dust was observed at all, and no image deterioration due to a change in dot diameter or the like was observed even when the outside air temperature changed or the number of plate making increased, and good plate making was possible.

Thereafter, as described above, the fixing was carried out using the heat roller under the following fixing conditions. That is, the heat roller temperature is 160 ° C., the plate cylinder transport speed (peripheral speed) 1
The processing was performed under the fixing conditions of 0.6 mm / s and the pressure (nip pressure) of the heat roller against the plate cylinder of 0.55 MPa.
Thereafter, printing on printing paper was performed by a normal lithographic printing method. That is, a printing image is formed by applying a printing ink and a fountain solution, the printing ink image is transferred onto a rotating blanket cylinder together with the plate cylinder, and then the printing image passes between the blanket cylinder and the impression cylinder. The printing ink image on the blanket cylinder was transferred onto the coated paper.

In the obtained printed matter, when the number of sheets passed through was 10,000, flying occurred in a part of the highlight, but up to 5,000 sheets, the printed image was an extremely clear image without flying or blurring. In addition, no maintenance was required after plate making, and a good printed matter could be produced even after 3 months or more.

Embodiment 3 As an ink jet recording apparatus mounted on four plate cylinders of a single-sided four-color printing apparatus (see FIG. 9), a 50-mode in a share mode was used.
An oil ink (manufactured by the company) or a UV ink (manufactured by the company) was used using a zero-channel piezo inkjet apparatus (XaarJet500S manufactured by Xaar). The gap adjustment (gap 0.8 mm) is performed by a Teflon-made contact roller, image data to be printed is transmitted to an image data arithmetic and control unit, and the 500-channel ejection head is moved while rotating the plate cylinder. Ink is simultaneously ejected on the aluminum plate on one plate cylinder to form an image,
Plate making was performed 500 times for each of the oil-based ink and the UV ink. At the time of drawing, gradation resolution was performed by setting the drawing resolution to 360 dpi and changing the dot size to eight levels. The processing was performed under the fixing conditions of a heat roller temperature of 160 ° C., a transfer speed (peripheral speed) of the plate cylinder of 10.6 mm / s, and a pressure (nip pressure) of the heat roller against the plate cylinder of 0.55 MPa. As a result, no defective drawing due to dust and no influence due to a change in outside temperature were observed. The dot diameter was slightly changed by the increase in the number of plate making, but it was within the range where there was no effect.

After the end of plate making, the ejection portion of the head is wiped with non-woven paper and stored in a cover.
A good printed matter could be produced without maintenance work for three months.

Example 4 The drawing unit of a piezo ink jet device (Calario PM750C manufactured by Epson) was used as the ink jet device, and the oil-based ink used in Example 3 was used. As the plate material, a paper plate material provided with a hydrophilic image receiving layer on the surface shown below was used.

A high-quality paper having a basis weight of 100 g / m 2 was used as a substrate, and on a paper support provided with a water-resistant layer mainly composed of kaolin and resin components of polyvinyl alcohol, SBR latex and melamine resin on both surfaces of the substrate. A dispersion plate A having the following composition and prepared as described below was provided with an image-receiving layer so that the coating amount after drying was 6 g / m 2 to obtain a paper plate material.

Dispersion A Gelatin (Wako Pure Chemicals first grade) 3 g Colloidal silica (Nissan Chemical: Snowtex C, 20% aqueous dispersion) 20 g Silica gel (Fuji Silysia Chemical: Sylysia # 310) 7 g Hardener 0 0.4 g of distilled water and 100 g of glass beads were dispersed for 10 minutes using a paint shaker.

The head is mounted on a single-sided single-color printing machine (see FIGS. 1 to 3), the gap adjustment (gap 1.5 mm) is performed by an attached roller made of Teflon, and the image data to be printed is sent to the image data calculation control unit. The ink is ejected onto the plate material on the plate cylinder to form an image by transmitting and moving the ejection head using 32 channels for one color of the head while rotating the plate cylinder. Plate making was performed. At the time of drawing, the drawing resolution was set to 720 dpi, and gradation expression was performed using an error diffusion method. In addition, heat roller temperature 16
0 ° C., conveying speed (peripheral speed) of the plate cylinder 10.6 mm / s,
Pressure (nip pressure) on plate cylinder of heat roller 0.55
The processing was performed under the fixing condition of MPa. As a result, no defective drawing due to dust and no influence due to a change in outside temperature were observed. When printing was performed using the coated printing paper, an extremely clear printed matter was obtained without any skipping or blurring in the printed image even after 5,000 sheets were passed. However, after 5,000 sheets were passed, an elongation of 0.1 mm was observed in the longitudinal direction of the A3 image. On the other hand, when high quality paper was used as printing paper,
When a thousand sheets were printed, solid crushing failure occurred due to paper dust. Therefore, an air suction pump was installed as a paper dust prevention device near the paper feeding unit, and printing was performed. As a result, printing failure did not occur, and the obtained printed matter was an extremely clear image without flying or blurring even after passing 5,000 sheets. However, after 5,000 sheets were passed, an elongation of 0.1 mm was observed in the longitudinal direction of the A3 image.

After the end of plate making, the head nozzles are sucked out and stored in the cover, so that 3
Good prints could be made without any maintenance work for months.

Example 5 Instead of the aluminum plate of Example 1, a plate material provided with an image receiving layer which can be made hydrophilic by a desensitizing treatment was used on the surface shown below, and a 600 dpi full line head was used as a head. Using the plate cylinder, drawing is performed on the entire surface of the plate material by only one rotation of the plate cylinder. After the printing plate is prepared, the non-image area is made hydrophilic using a plate surface desensitizing device, and a conductive plate spring (phosphor blue) is used for drawing. Made of copper)
The same operation as in Example 1 was performed except that the plate material conductive layer was grounded by contact. That is, the fixing conditions are as follows: the heat roller temperature is 160 ° C., and the conveying speed (peripheral speed) of the plate cylinder is 10.6 m.
m / s, pressure of the heat roller against the plate cylinder (nip pressure)
The processing was performed under the fixing condition of 0.55 MPa.

A high-quality paper having a basis weight of 100 g / m ² was used as a substrate, and a polyethylene film was laminated on both sides of the substrate to a thickness of 20 μm on a water-resistant paper support. The layer coating is applied on one side, and after drying, the applied amount is 10 g / m ² ,
Further, the dispersion B was coated thereon after drying as a coating amount of 1.5
An image receiving layer was provided so as to have a g / m ² to obtain a plate material.

(1) Coating for conductive layer: 5.4 parts of carbon black (30% aqueous dispersion), 54.6 parts of clay (50% aqueous dispersion), SBR latex (solid content 50%, T
(g 25 ° C.) 36 parts and melamine resin (solid content 80%, Sumiretz Resin SR-613) 4 parts were mixed, and water was added so that the total solid content was 25% to obtain a paint. (2) Dispersion B: 100 g of dry zinc oxide, 3 g of binder resin (B-1) having the following structure, 17 g of binder resin (B-2), 0.15 g of benzoic acid and 155 g of toluene were mixed with a wet disperser homogenizer. Using Nippon Seiki Co., Ltd., the mixture was dispersed at 6,000 rpm for 8 minutes.

[0102]

Embedded image

Example 6 A thermal jet device (C
A drawing unit of BJ35V manufactured by annon was used. However, an ink having the following composition was prepared and used. Acrylic resin (DEGALANLS50 / 150 manufactured by Dagussa) 5% by weight Dye (Victoria Pure Blue manufactured by Hodogaya Chemical Co., Ltd.) 30% by weight Methyl ethyl ketone 55% by weight Ethylene glycol monoethyl ether 10% by weight The same plate material as in Example 5 is used on a plate cylinder. After mounting, the dust on the surface of the printing plate was removed by suction with an air pump, the discharge head containing the ink was controlled to a distance of 2 mm from the printing plate by an output from an optical gap detecting device. The image data to be printed was transmitted to the image data arithmetic and control unit, and the ink was ejected onto the plate material to form an image by moving the ejection head while rotating the plate cylinder. At the time of ejection, drawing was performed using the error diffusion method with binary values of 600 dpi using image data. No defective drawing due to dust was observed at all, and no image deterioration due to a change in dot diameter or the like was observed even when the outside air temperature changed or the number of plate making increased, and good plate making was possible.

Thereafter, a fixing process was performed under the same fixing conditions as described above, and printing was performed on printing paper in the same manner as described above. In the obtained printed matter, when the number of sheets passed through was 10,000, some of the highlights were skipped. However, up to 5,000 sheets, the printed image was an extremely clear image without any skipping or blurring.

After the plate making operation, the head nozzles are sucked out, the nozzles are cleaned with non-woven paper, and then stored in the cover, so that good printed matter can be obtained without maintenance work for three months. Could be produced.

[0106]

According to the present invention, a large number of prints of clear images can be printed. In addition, a printing plate corresponding to digital image data can be stably produced with high image quality directly on a printing press, and inexpensive and high-speed lithographic printing can be performed. Further, the fixing can be achieved by heating for a short time of only 1 sec at 80 ° C. to obtain sufficient printing durability, thereby improving the processing speed of the fixing process and improving the fixing process. Space can be achieved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram schematically illustrating an example of an on-press drawing single-color lithographic printing apparatus according to the present invention.

FIG. 2 is an overall configuration diagram schematically illustrating another example of the on-press drawing single-color lithographic printing apparatus according to the present invention.

FIG. 3 is an overall configuration diagram schematically showing still another example of the on-press drawing single-color lithographic printing apparatus according to the present invention.

FIG. 4 is a configuration diagram showing a positional relationship between a heat roller and a plate cylinder according to the present invention as an image fixing device.

FIG. 5 is a configuration diagram schematically illustrating an example of a drawing unit of the on-press drawing lithographic printing apparatus of FIGS. 1 to 3;

FIG. 6 is a configuration diagram schematically showing one embodiment of a head protection cover used in the present invention.

FIG. 7 is a schematic configuration diagram illustrating a main part of an inkjet recording apparatus used in the present invention.

FIG. 8 is a schematic configuration diagram in which a regulating plate is removed from the ink jet recording apparatus of FIG. 7;

FIG. 9 is an overall configuration diagram schematically showing an on-press drawing four-color single-sided lithographic printing machine as an example of a multi-color printing machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 On-machine drawing lithographic printing apparatus 2 Ink jet recording apparatus 3 Dampening solution supply apparatus 4 Printing ink supply apparatus 5 Fixing apparatus 5 'Heat roller 6 Plate surface desensitizing apparatus 7 Plate material automatic plate supply apparatus 8 Plate material automatic plate discharge apparatus 9 Plate Material (printing original plate) 10 Dust removing means 11 Plate cylinder 11a Heat insulating material 12 Blanket cylinder 13 Impression cylinder 14 Blanket cleaning device 14 'Impression cylinder cleaning device 15 Paper dust generation prevention device 20a Digital control means 20b Head protection means 21 Image data arithmetic control Unit 22 Discharge head 22b Discharge electrode 24 Ink supply unit 25 Ink tank 26 Ink supply device 27 Stirring unit 28 Ink temperature management unit 29 Ink density control unit 30 Encoder 31 Head separation / attachment device 32 Head sub-scanning unit 41 Head main body 42, 42 ' Meniscus regulating plate 43 Ink groove 44 Partition wall 5,45 'discharge portion 46 partition wall 51 cover 52 shutter P printed sheet F Food

Claims (11)

[Claims] An image is formed directly on a plate material by an ink jet method in which a plate material is mounted on a plate cylinder of a printing press and an ink containing a lipophilic component is ejected based on a signal of image data. An on-press lithographic printing method in which a printing plate is prepared by performing the lithography process and lithographic printing is continuously performed using the plate material in the state, wherein the heating and fixing are performed by a heat roller. Lithographic printing method. 2. The method according to claim 1, further comprising: removing a dust present on a surface of the printing plate before drawing on the printing plate by the ink-jet method and / or during drawing, and / or cleaning the printing head at least after finishing printing. 2. The lithographic printing method for on-press drawing according to claim 1, wherein: 3. An ink jet drawing comprising a recording head for discharging ink containing a lipophilic component as a direct image forming means for directly forming an image on a plate material mounted on a plate cylinder of a printing press based on a signal of image data. An on-press drawing printing apparatus comprising: an apparatus; a heat fixing means for heating and fixing the image; and a lithographic printing means for performing lithographic printing on a printing plate heat-fixed by the heat fixing means. -An on-press lithographic printing apparatus characterized in that it is a roller. 4. The apparatus according to claim 1, further comprising a roller separating means for providing said roller so as to be detachable from said plate cylinder. 4. An on-press lithographic printing apparatus according to claim 3, wherein said lithographic printing apparatus is operable to move the roller away from said plate cylinder. 5. A plate material surface dust removing means for removing dust present on a plate material surface before and / or during drawing on the plate material, wherein the direct image forming means is provided. Item 5. An on-press lithographic printing apparatus according to item 3 or 4. 6. The image forming apparatus according to claim 3, wherein at the time of drawing on said plate material, said direct image forming means performs main scanning by rotating a plate cylinder on which said plate material is mounted. Item. 7. The recording head comprises a single-channel head or a multi-channel head, and performs sub-scanning by moving the recording head in the axial direction of the plate cylinder when drawing on the plate material. An on-press lithographic printing apparatus according to claim 6. 8. The on-press lithographic printing apparatus according to claim 6, wherein the recording head comprises a full line head having a length substantially equal to the width of the plate cylinder. 9. The ink jet drawing apparatus moves the recording head close to the plate cylinder when drawing on the plate material, and separates the recording head from the plate cylinder except when drawing on the plate material. 4. The method according to claim 3, further comprising:
9. The on-press lithographic printing apparatus according to any one of items 8 to 8. 10. The on-press lithographic printing apparatus according to claim 3, wherein the direct image forming means includes a recording head cleaning means for cleaning the recording head at least after the completion of plate making. Printing device. 11. The on-press lithographic printing apparatus according to claim 3, wherein the lithographic printing means includes paper dust removing means for removing paper dust generated during lithographic printing. .