JP4291721B2 - Plate making method - Google Patents

Description

  The present invention relates to a plate making method in which a photosensitive lithographic printing plate precursor and a lithographic printing dummy plate precursor are made by a common CTP plate making system.

In the case of color newspaper printing (multicolor printing), when it is necessary to print a part of paper with two colors or one color, a dummy plate whose entire surface is a non-image part is attached to an unused plate cylinder. May print. In addition, for such newspaper printing, a CTP (computer to plate) plate making system is used, but until now there has been no dummy plate original dedicated to this CTP plate making system, and a conventional PS plate dummy plate (for example, Patent Document 1). 2 and 3) were developed with a conventional PS plate automatic developing machine to make a plate and used as a dummy plate.
However, such a method is uneconomical, and the development processing section is different between the photosensitive lithographic printing plate precursor and the dummy printing plate precursor, so that the development processing becomes two lines, and a wide place for line installation in the CTP plate making system. In addition, there is a problem that the economic burden is large.

In addition, even if the photosensitive lithographic printing plate precursor and the dummy plate precursor are processed with one automatic processor in the CTP plate making system, the layer configuration, the applied material and the coating amount of both differ, and depending on the day, Since the usage ratio of the photosensitive lithographic printing plate precursor and the dummy lithographic printing plate precursor are different, if the developer is replenished in the same manner as when processing only the photosensitive lithographic printing plate precursor, the pH of the developing solution remains constant. Could not manage to. For this reason, the pH of the developer is increased, the damage of the image portion of the lithographic printing plate is increased and the printing durability is lowered, or the pH of the developer is lowered, the developability is lowered, and the lithographic printing plate In addition, problems such as dot gain and printing stains occurred.
In order to solve this problem, it is necessary to replenish the photosensitive lithographic printing plate precursor and the dummy printing plate precursor with a developer suitable for the use ratio. Since there was no distinction between them, the current situation is still not solved.
Conventionally, in spite of the unnecessary steps for the dummy plate precursor, there was wasted plate making time, such as performing exposure by wrapping around the drum of the plate setter like the photosensitive lithographic printing plate precursor. . This is also a problem that can be solved by distinguishing the photosensitive lithographic printing plate precursor from the dummy lithographic printing plate precursor, and it is a big problem to give distinction between the photosensitive lithographic printing plate precursor and the dummy printing plate precursor. It has become a challenge.
JP-A-3-175090 Japanese Patent No. 29951907 JP-A-11-240266

An object of the present invention is to solve the conventional problems and achieve the following objects.
That is, an object of the present invention is a plate making method for making a photosensitive lithographic printing plate precursor and a lithographic printing dummy plate precursor with a common CTP plate making system, and for the photosensitive lithographic printing plate precursor and the dummy plate precursor. Economical processing is possible without preparing separate development processing lines, and even if photosensitive lithographic printing plate precursors and dummy plate precursors are supplied together, stable plate-making quality is maintained for both. Another object of the present invention is to provide a plate making method capable of reducing the time required for the plate making process.

  As a result of intensive studies to solve the above problems, the present inventor has found that the above object can be achieved by the following means, and has completed the present invention.

The plate making method of the present invention is a CTP comprising a photosensitive lithographic printing plate precursor and a lithographic printing dummy plate precursor, an exposure processing section that performs exposure processing by laser light irradiation, and a development processing section that performs development processing in this order. A plate making method for making a plate using a plate making system,
The lithographic printing plate precursor has an absorption maximum having an absorbance X of 0.20 or more in the region of 350 to 800 nm, and the absorbance Y and the absorbance X at the wavelength indicating the absorption maximum of the photosensitive lithographic printing plate precursor. The difference is ± 0.10 or more.

In the plate making method of the present invention, when the photosensitive lithographic printing plate precursor is processed, the photosensitive lithographic printing plate precursor is identified from the lithographic printing dummy plate precursor, and the amount of developer replenished in the development processing unit is determined. It is preferable to control so that it is less when processing the lithographic printing plate precursor.
Further, in the plate making method of the present invention, the photosensitive lithographic printing plate precursor and the lithographic printing dummy plate precursor are identified, and in the case of the lithographic printing dummy plate precursor, development processing is performed without performing exposure processing. It is also preferable to carry it to the part.

  Furthermore, in the plate making method of the present invention, it is a preferable aspect that the CTP plate making system has a heat treatment portion as necessary between the exposure treatment portion and the development treatment portion.

In addition, in the plate making method of the present invention, the coating amount of the photosensitive layer of the photosensitive lithographic printing plate precursor is 1.0 g / m ² or more, and the coating amount of the protective layer of the lithographic printing dummy plate precursor is 1. It is preferably 0 g / m ² or less.

  According to the plate-making method of the present invention, a plate-making method for making a photosensitive lithographic printing plate precursor and a lithographic printing dummy plate precursor using a common CTP plate-making system, the photosensitive lithographic printing plate precursor and the dummy plate precursor for Can be processed economically without preparing separate development processing lines, and even when photosensitive lithographic printing plate precursors and dummy plate precursors are supplied together, stable plate-making quality is provided for both. It is possible to provide a plate making method that can be maintained and that can shorten the time required for the plate making process.

Hereinafter, the plate making method of the present invention will be described in detail.
The plate making method of the present invention is a CTP comprising a photosensitive lithographic printing plate precursor and a lithographic printing dummy plate precursor, an exposure processing section that performs exposure processing by laser light irradiation, and a development processing section that performs development processing in this order. A plate making method for making a plate using a plate making system,
The lithographic printing plate precursor has an absorption maximum having an absorbance X of 0.20 or more in the region of 350 to 800 nm, and the absorbance Y and the absorbance X at the wavelength indicating the absorption maximum of the photosensitive lithographic printing plate precursor. The difference is ± 0.10 or more. Hereinafter, the photosensitive lithographic printing plate precursor will be referred to as “printing plate precursor” and the dummy plate precursor for lithographic printing will be referred to as “dummy plate precursor” as appropriate.

In the present invention, for example, when the dummy plate precursor has an absorption maximum with an absorbance X of 0.20 or more at a wavelength of 500 nm, the difference between the absorbance Y at 500 nm of the printing plate precursor and the absorbance X of the dummy plate precursor is Must be ± 0.10 or more.
Further, in the present invention, when the dummy plate precursor has a plurality of absorption maxima having an absorbance of 0.20 or more in the region of 350 to 800 nm, the absorbance X of the dummy plate precursor and the printing plate at one of the absorption maxima. There should be a difference of ± 0.10 or more with the absorbance Y of the original.
As described above, since there is the above difference in the absorbance between the dummy plate precursor and the printing plate precursor at a certain maximum absorption wavelength of the dummy plate precursor, it is possible to distinguish between the two plates by a color sensor or the like.

[CTP plate making system]
First, the CTP plate making system in the present invention will be described.
The CTP plate making system according to the present invention comprises at least a photosensitive lithographic printing plate precursor and a lithographic printing dummy plate precursor, an exposure processing unit that performs exposure processing by laser light irradiation, and a development processing unit that performs development processing in this order. Prepare.
Hereinafter, an exemplary aspect of the CTP plate making system according to the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a perspective view showing a schematic configuration of an exemplary embodiment of the CTP plate making system according to the present invention.

As shown in FIG. 1, the CTP plate making system 100 performs a plate setter 10 as an exposure processing unit that performs exposure processing by laser light irradiation, a heating oven 40 as a heating processing unit, and a development processing, if necessary. And an automatic developing machine 60 as a developing processing unit to be performed. Each of these units is connected to a computer as the control device 95, and a computer system for linking with a higher system is constructed.
In this embodiment, the plate setter 10 is provided with a color sensor (not shown) for identifying both the photosensitive lithographic printing plate precursor and the dummy plate precursor before they are supplied to the exposure unit. This identification result is transmitted to the control device 95. Based on the identification result, the control device 95 makes it possible to change the operation of each part constituting the CTP plate making system 100 according to the type of the plate. An identification signal indicating which of the plate precursors is output to the plate setter 10, the heating oven 40, and the automatic processor 60, respectively.

The plate setter 10 includes, for example, an exposure unit that exposes a photosensitive lithographic printing plate precursor by laser light irradiation, a plate supply / discharge mechanism that supplies and discharges the printing plate precursor to the exposure unit, a color sensor mechanism, A control unit (control means) that controls and controls the plate, a plate storage cassette that stores the printing plate precursor and dummy plate precursor before plate formation, and a close contact to protect the surface of the printing plate precursor and dummy plate precursor And an interleaving paper waste bin for peeling off and disposing of the interleaving paper.
Further, the control unit in the plate setter 10 detects whether the plate to be processed is a printing plate precursor or a dummy plate precursor by an identification signal transmitted from the control device 95.

As the exposure unit, the printing plate precursor supplied from the plate supply / discharge mechanism is wound around the outer periphery of the exposure drum, and the surface of the wound printing plate precursor is irradiated with laser light from the laser light source while rotating the exposure drum. In addition to an outer drum system that exposes an image, an inner drum system that exposes a printing plate precursor by suction on the inner surface of the drum and rotates a light source that is discarded at the center of the drum, and further a printing plate It is also possible to adopt a flat bed type in which the original plate is fixed to a flat bed and the exposure is performed by operating the laser light source vertically and horizontally.
The laser light source used for exposure is movable and scanned in the axial direction of the drum by a guide rail, and performs laser irradiation based on image information processed by a computer constituting the control device 95. In scanning with laser light, for example, the rotation direction of the drum is the main scanning direction, and the axial direction of the drum is the sub-scanning direction.

  The laser light source in the present invention is used without limitation as long as laser light irradiation is possible, and preferably a high-power semiconductor laser that oscillates in the infrared region of 700 to 1200 nm or a 1064 nm YAG laser is known. However, a 830 nm semiconductor laser is particularly suitable for high output.

  The plate supply / discharge mechanism moves the printing plate precursor stored in the plate storage cassette to the exposure drum. Further, when the plate stored in the plate storage cassette is a dummy plate original, it is not necessary to perform an exposure process, so that it is carried out to the next step. The dummy original plate may also be mounted on the exposure drum, and may be unloaded without being exposed and then carried out to the next step.

The slip sheet mounted on the surface of each original plate needs to be removed before being exposed. In the present invention, even if a slip sheet is mounted on the surface of the printing plate precursor or the dummy plate precursor, the slip sheet that is usually white can be distinguished from both plates by the color sensor mechanism. Therefore, the slip sheet can be removed by using a predetermined means.
Here, as a means for removing the slip sheet in contact with the plate surface, a type using an adsorbing means, a type in which the slip sheet is blown off by wind pressure, or peeling from the plate surface using charging to the slip sheet. Various known mechanisms such as those of the type can be used. The removed interleaving paper is disposed of in the interleaving paper waste bin.

The printing plate precursor that has been subjected to the exposure process is carried out from the exposure drum to the next step by the plate carry-out mechanism.
Here, depending on the type of the printing plate precursor, a heating oven 40 may be introduced between the plate setter 10 and the automatic processor 60.
Furthermore, when both plates are transferred, the type of plate (printing plate precursor and dummy plate precursor) and the presence or absence of slip sheets may be checked by sensors or the like provided at various places.

  As the above plate setter 10, commercially available devices include, for example, CreoScitex, TrendsetterNews200, KPG, NewsetterTH180, Fuji Photo Film Luxel T-9000CTP, Krause LaserStar 170T, Dainippon Screen HS, Matsushita Electric Power Company EC9 Thermal Setter EC9 Setter Amzisetter, Creo thermal setter, etc. are provided with at least a color sensor mechanism for identifying the type of plate, and an identification signal is sent from a control device 95 that can determine the next processing method based on the identification result by the color sensor. It can be used by improving it so that it can be received.

The exposure process in the plate making method of the present invention using the above plate setter 10 will be specifically described.
First, when the slip sheet is mounted on the surface of the printing plate precursor and the dummy plate precursor stored in the plate storage cassette, the slip sheet is peeled and removed by the automatic slip sheet removing mechanism. When the plate from which the interleaving paper has been removed is a printing plate precursor, the plate is mounted on an exposure drum of an exposure unit, and image exposure is performed by laser light irradiation from a laser light source. Then, the printing plate precursor on the exposure drum that has been subjected to the exposure process is peeled off from the exposure drum and carried out to the next step.
On the other hand, when the plate from which the interleaving paper is removed is a dummy original plate, it is carried out to the next step without being exposed.

The heating oven 40 may be necessary depending on circumstances. For example, the image in the photosensitive layer generated by laser light exposure is crosslinked by heating to form an image part, or the radical in the photosensitive layer generated by laser light exposure is used to accelerate polymerization to form an image part. can do.
Specifically, as shown in FIG. 2, the heating oven 40 includes a heating zone 43 having heating means 42 for performing predetermined heating on the plate, an air cooling having a fan 44 for cooling the plate after the heat treatment, and the like. A transport belt 46 having a metal transport belt for sequentially transporting the plate to the zone 45, the heating zone 43, and the air cooling zone 45 as transport means, and a transport roller 47 for suspending the transport belt of the conveyor 46. And a control unit 51 that controls at least the operation of the motor drive unit 48. According to this configuration, when the motor driving unit 48 drives at least one of the transport rollers 47, the transport belt of the transport conveyor 46 moves, and the plate placed on the transport belt is removed from the plate setter 10 side. It passes through the heating zone 43 and the air cooling zone 45 and is carried out to the automatic developing machine 60 side.

In addition, the motor drive part 48 may employ | adopt the motor drive circuit which can increase / decrease a rotational speed so that the conveyance speed by the conveyance conveyor 46 becomes variable.
The control unit 51 detects, based on the identification signal transmitted from the control device 95, whether the plate to be processed is a printing plate precursor or a dummy plate precursor, and the motor driving unit 48 according to the type of the detected plate. Is controlled to switch the passage speed of the plate in the heating oven 40. Therefore, the control unit 51 functions as a speed switching unit for the conveyance speed.
That is, in the case of the dummy plate precursor, there is no exposed photosensitive layer unlike the printing plate precursor, so that the same heating as the printing plate precursor is not necessary. Therefore, in the case of the dummy plate precursor, the passage speed is set higher than that in the case of the printing plate precursor, and it is set to carry at high speed.

  As the heating oven 40, for example, a commercially available product is used by adding means for changing the plate passage speed according to the identification signal to the Wisconsin Oven SPC series or the Unigraph Oven CPO series. be able to.

The automatic processor 60 is attached to, for example, a developing unit 61 for developing a printing plate precursor or a dummy plate precursor, and a developed plate, as shown in a schematic configuration example of the automatic processor in FIG. A washing unit 63 for washing away the developer, a finisher unit 65 for applying the gum solution, and a drying unit 67 for drying the plate after applying the gum solution are arranged in this order.
The insertion port 70 of the developing unit 61 is equipped with a sensor 68 that detects the loading of the plate. When the loading of the plate is detected by the sensor 68, the developing unit 61, the washing unit 63, the finisher unit 65, and the drying unit 67 are sequentially sent and discharged from the discharge port 74.
In some cases, a preheating unit may be provided in front of the developing unit 61 instead of the heating oven 40, or there may be no heating part.

  The conveying means 72 is configured to convey the plate along a predetermined path by a plurality of conveying rollers 76. Each transport roller 76 constituting the transport means 72 is driven by a motor drive unit 78. The operation of the motor drive unit 78 is controlled by the control unit 80. The motor drive unit 78 employs a motor drive circuit capable of increasing / decreasing the rotation speed so that the conveyance speed is variable so that the conveyance speed in the conveyance means 72 is variable. Also good.

The control unit 80 detects whether the plate to be processed is a printing plate precursor or a dummy plate precursor based on the identification signal transmitted from the control device 95, and the motor driving unit 78 according to the type of the detected plate. Is controlled to switch the passage speed of the plate in the automatic developing machine 60, particularly the passage speed in the developing unit 61. Therefore, the control unit 80 functions as a speed switching unit for the conveyance speed.
In other words, the dummy plate precursor has a resin layer to protect the surface, but the coating amount is not as large as the photosensitive layer of the printing plate precursor, so the same development time as the printing plate precursor is necessary. Absent. Therefore, in the case of the dummy plate precursor, the passage speed in the developing unit 61 is set higher than that in the case of the printing plate precursor so as to be conveyed at high speed.

Here, each part of the automatic developing machine 60 will be supplementarily described.
In the developing unit 61, a plate 3 such as a printing plate precursor and a dummy plate precursor supplied to the insertion port 70 is inserted into an alkali developer 82 having a predetermined concentration stored in the developer layer 81, and is disposed in the alkali developer 82. In the case of a printing plate precursor, the unexposed portion is removed, and in the case of a dummy plate precursor, the non-photosensitive resin layer is removed.
The development layer 81 is replenished with a development replenishment stock solution (concentrated developer) or a dilute solution (usually distilled water) in a timely manner in order to compensate for the deterioration and consumption of the alkaline developer 82 according to the plate processing and the like. Although not shown, the temperature of the alkaline developer 82 in the developing layer 81 is controlled by a heater or a cooler.

When replenishing the development replenishment stock solution or the diluting solution, the printing plate precursor and the dummy plate precursor are applied with different materials and coating amounts. Therefore, the pH and conductivity of the alkaline developer 82 are always constant. Etc. cannot be managed consistently. Therefore, in the present invention, by changing the replenishment amount of the development replenishment stock solution or the diluting solution according to the processing amount (processing ratio) of each of the printing plate precursor and the dummy plate precursor, The pH and conductivity of the alkaline developer 82 can be maintained in an appropriate state.
More specifically, the control unit 80 detects whether the plate to be processed is a printing plate precursor or a dummy plate precursor based on the identification signal transmitted from the control device 95, and according to the type of the detected plate. Thus, by controlling the amount of replenishment of the development replenishment stock solution and the thinning solution, the pH, conductivity, etc. of the alkaline developer 82 in the development layer 81 are maintained in an appropriate state. Thereby, it is possible to prevent the property of the alkali developer 82 from becoming unstable due to the development processing of the dummy plate precursor.
In other words, the dummy plate precursor has a resin layer to protect the surface, but the amount of coating is not as large as the photosensitive layer of the printing plate precursor. No amount is needed. Therefore, the liquid replenishment amount executed by the control unit 80 is caused by the difference in the components of the plate by setting the liquid replenishment amount to be smaller than that of the printing plate precursor when the plate to be developed is a dummy plate precursor. The difference in the degree of deterioration of the alkaline developer 82 is compensated.

  Regardless of whether the power of the automatic developing device 60 is turned on or off, the pH of the alkaline developer 82 in the developing layer 81 naturally decreases due to contact with carbon dioxide in the atmosphere, so the printing plate precursor and the dummy plate precursor. In addition to the above processing amount, the above-described development replenishment stock solution and diluting solution are replenished according to the elapsed time in order to recover the pH lowered by the carbon dioxide gas to a constant level.

In the washing unit 63, the plate is washed with water sprayed from the nozzle 84 for the purpose of removing the alkaline developer remaining on the surface of the developed plate and reducing the amount of alkali solution brought into the finisher unit 65 in the next step. . Therefore, without distinguishing between the printing plate precursor and the dummy plate precursor, the washing tank 83 storing the washing water is replenished with washing water from a water supply tank (not shown) so that the stored washing water does not deteriorate. Is made as appropriate.
In addition, when the automatic developing machine 60 is turned on or off, the washing tank 83 is replenished with the same amount of washing water as the amount of volatilization so as to compensate for the volatilization of water naturally. May be.

In the finisher portion 65, a prescribed concentration of gum 85 is applied to the surface of the plate, and the photosensitive layer of the printing plate precursor that has become alkaline is returned to acidity to prevent damage to the image portion due to development. Prevent scratches. The gum 85 having the specified concentration is applied to the entire surface regardless of the image portion and the non-image portion. Therefore, the gum storage tank 86 for storing the applied gum 85 does not distinguish between the printing plate precursor and the dummy plate precursor. The gum replenishment stock solution and dilution solution may be replenished according to the processing amount of the plate.
Note that when the power of the automatic developing device 60 is turned on or off, water volatilizes naturally. In this case, the volatilized water is separated from the processing amount of the printing plate precursor and the dummy plate precursor. It is preferable to replenish with the same amount of water.

In the case of this aspect, the replenishment of the diluted solution to the gum storage tank 86 of the finisher unit 65 is also performed by the pump 84 that supplies water to the water washing unit 63, and this configuration simplifies the configuration. The gum replenishment stock solution 86 is replenished to the gum storage tank 86 of the finisher unit 65 from a gum stock solution storage tank (not shown) that stores the gum replenishment stock solution.
The above washing water and gum replenishment are controlled by the control unit 80 or a similar control unit so that liquid replenishment according to the processing amount of the plate is realized.

  The drying unit 67 is provided with a drying unit 91 such as a hot air supply unit such as a blower or a heat generation unit, and blows the hot air on the printing plate and the dummy plate to dry the gum solution applied to the plate. . The printing plate and the dummy plate dried by the drying unit 67 are discharged from the discharge port 74.

  Further, another configuration example of the automatic developing machine will be described below. FIG. 4 is an explanatory view showing another embodiment of the automatic processor used in the present invention. The automatic developing machine 1 having this configuration has a pre-water washing section and is used in the case of a polymerizable photosensitive printing plate precursor having an oxygen-blocking overcoat layer. As shown in FIG. 4, the automatic developing machine 1 includes a heating unit 11, a pre-water washing tank 12, a developing tank 13, a water washing tank 14, a gum tank 15, and a drying unit 16 in this order. Note that the heating unit 11 may be omitted depending on circumstances.

In the pre-water washing tank 12, the overcoat layer of the oxygen barrier layer of the polymerizable photosensitive printing plate precursor is washed away with water. As the development process proceeds, the concentration of the water-soluble resin dissolved in the pre-water washing tank 12 increases, the dissolution and removal performance deteriorates, and waste is generated. Therefore, it is necessary to replenish water. On the other hand, since the dummy plate precursor is not provided with an oxygen barrier layer, replenishment of water is not necessary when the dummy plate precursor is processed.
In the present invention, the amount of water in the pre-washing tank 12 is appropriately changed by changing the amount of water replenished according to the processing amount (processing ratio) of each of the polymerizable photosensitive printing plate precursor and the dummy plate precursor. Can be maintained in a state.
In addition, when the power of the automatic developing machine 1 is turned on or off, water is volatilized spontaneously from the pre-washing tank 12, so that the throughput of the polymerizable photosensitive printing plate precursor and the dummy printing plate precursor is reduced. Apart from that, it is preferable to replenish with the same amount of water that volatilizes.

In the developing tank 13, the unexposed portion of the polymerizable photosensitive printing plate precursor is removed with an alkali developer, and the protective layer (resin layer) of the dummy plate is removed. Since the polymerizable photosensitive printing plate precursor and the dummy plate are applied with different materials and application amounts, the pH of the alkali developer cannot be controlled uniformly with the same replenishment amount. Therefore, in the same manner as the developing unit 61 in the automatic processor 60 shown in FIG. 3 described above, depending on the processing amount (processing ratio) of each of the polymerizable photosensitive printing plate precursor and the dummy plate precursor, By changing the replenishment amount of the replenishment stock solution or the like, the pH of the alkaline developer in the developing tank 13 can be maintained in an appropriate state.
When the power of the automatic developing machine 1 is turned on or off, the pH is naturally lowered by carbon dioxide gas in the atmosphere, so the processing amount of the polymerizable photosensitive printing plate precursor and the dummy printing plate precursor In addition, it is preferable to perform replenishment for recovering the pH lowered by carbon dioxide gas to a constant level.

  In the water washing tank 14, the plate is washed with water for the purpose of removing the alkali developer remaining on the surface of the developed plate and reducing the amount of alkali solution brought into the gum tank 15 in the next step. Therefore, the same amount may be replenished so as not to deteriorate the washing water without distinguishing between the polymerizable photosensitive printing plate precursor and the dummy plate precursor. When the power of the automatic developing machine 1 is turned on or off, it is preferable to replenish the same amount of water as the volatilized amount so as to compensate for the volatilized water naturally.

  In the gum tank 15, the gum is applied, and the photosensitive layer of the printing plate precursor that has become alkaline is returned to acidity to suppress damage to the image area due to development and to prevent stains and scratches on the non-image area. Since the gum is applied to the entire surface regardless of the image portion and the non-image portion, the same amount of the gum replenishing stock solution may be replenished without distinguishing the polymerizable photosensitive printing plate precursor and the dummy plate precursor. In addition, when the power of the automatic processor is turned on or off, water volatilizes naturally, so that the volatilized water is separated from the processing amount of the polymerizable photosensitive printing plate precursor and the dummy plate precursor. It is preferable to replenish the same amount of water.

  The drying unit 16 is provided with drying means such as hot air supply means and heat generation means, and blows hot air on the printing plate and the dummy plate to dry the gum solution applied to the plate.

[Developer]
In the automatic developing machine 60 and the automatic developing machine 1, from the viewpoint of efficiently developing both the lithographic printing plate and the dummy plate precursor, it is preferable to use a developer containing the following components. The developer can also be used as a development replenisher (development replenisher stock solution).
Such a developer preferably contains an aromatic anionic surfactant.

(Aromatic anionic surfactant)
The aromatic anionic surfactant used in the developer in the present invention has a development accelerating effect and a dispersion stabilizing effect in the developer of the photosensitive layer component of the printing plate precursor and the protective layer component of the dummy plate precursor. The aromatic anionic surfactant used in the present invention is preferably a compound represented by the following general formula (A) or general formula (B).

In the general formula (A) or the general formula (B), R ¹ and R ³ each represent a linear or branched alkylene group having 1 to 5 carbon atoms, specifically, an ethylene group or a propylene group. , Butylene group, pentylene group and the like, among which ethylene group and propylene group are particularly preferable.
m and n each represent an integer selected from 1 to 100, among which 1 to 30 are preferable, and 2 to 20 are more preferable. When m is 2 or more, a plurality of R ³ may be the same or different. Similarly, when n is 2 or more, a plurality of R ⁵ may be the same or different.

R ² and R ⁴ each represent a linear or branched alkyl group having 1 to 20 carbon atoms, and specific examples include a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, and a dodecyl group. Of these, a methyl group, an ethyl group, an iso-propyl group, an n-propyl group, an n-butyl group, an iso-butyl group, and a tert-butyl group are particularly preferable.
p and q each represent an integer selected from 0 to 2; Y ¹ and Y ² each represent a single bond or an alkylene group having 1 to 10 carbon atoms. Specifically, a single bond, a methylene group, or an ethylene group is preferable, and a single bond is particularly preferable.
(Z ¹ ) ^{r +} and (Z ² ) ^{s +} each represents an alkali metal ion, an alkaline earth metal ion, or an ammonium ion that is unsubstituted or substituted with an alkyl group. Specific examples include lithium ion and sodium ion. Potassium ions, magnesium ions, calcium ions, ammonium ions, secondary to quaternary ammonium ions substituted with an alkyl group / aryl group having 1 to 20 carbon atoms, an aralkyl group, and the like, and sodium ions are particularly preferable. r and s each represent 1 or 2.
Specific examples are shown below, but the present invention is not limited thereto.

  These aromatic anionic surfactants may be used alone or in appropriate combination of two or more. The amount of the aromatic anionic surfactant added is preferably such that the concentration of the aromatic anionic surfactant in the developer is in the range of 1.0 to 10% by mass, more preferably in the range of 2 to 10% by mass. It is effective to do. Here, if the content is 1.0% by mass or less, the developability and the solubility of the photosensitive layer components are lowered, and if the content is 10% by mass or more, the printing durability of the printing plate is reduced. .

In addition to the aromatic anionic surfactant, other surfactants may be used in combination with the developer according to the present invention. Examples of other surfactants include polyoxyethylene naphthyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene stearyl ether, Polyoxyethylene alkyl esters such as oxyethylene stearate, sorbitan monolaurate, sorbitan monostearate, sorbitan distearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, sorbitan alkyl esters, glycerol mono Nonionic surfactants such as monoglyceride alkyl esters such as stearate and glycerol monooleate.
The content of these other surfactants in the developer is preferably from 0.1 to 10% by mass in terms of active ingredients.

(Chelating agent for divalent metals)
The developer according to the present invention preferably contains a chelating agent for a divalent metal, for example, for the purpose of suppressing the influence of calcium ions contained in hard water. Examples of the chelating agent for the divalent metal include Na ₂ P ₂ O ₇ , Na ₅ P ₃ O ₃ , Na ₃ P ₃ O ₉ , Na ₂ O ₄ P (NaO ₃ P) PO ₃ Na ₂ , Calgon (polymetaline). Polyphosphates such as ethylenediaminetetraacetic acid, its potassium salt, its sodium salt, its amine salt; diethylenetriaminepentaacetic acid, its potassium salt, sodium salt; triethylenetetraminehexaacetic acid, its potassium salt, its sodium salt Hydroxyethylethylenediaminetriacetic acid, its potassium salt, its sodium salt; nitrilotriacetic acid, its potassium salt, its sodium salt; 1,2-diaminocyclohexanetetraacetic acid, its potassium salt, its sodium salt; 1,3-diamino-2 -Propanol tetraacetic acid, its potassium salt, 2-phosphonobutanetricarboxylic acid-1,2,4, potassium salt thereof, sodium salt thereof; 2-phosphonobutanone tricarboxylic acid-2,3,4, 1-phosphonoethanetricarboxylic acid-1,2,2, potassium salt, sodium salt; 1-hydroxyethane-1,1-diphosphonic acid, potassium salt, sodium salt; aminotri And organic phosphonic acids such as (methylenephosphonic acid), its potassium salt, its sodium salt, etc. Among them, ethylenediaminetetraacetic acid, its potassium salt, its sodium salt, its amine salt; ethylenediaminetetra (methylenephosphonic acid) ), Its ammonium salt, its potassium salt; hexamethyl Emissions diamine tetra (methylene phosphonic acid), an ammonium salt, its potassium salt is preferred.
The optimum amount of such a chelating agent varies depending on the hardness of the hard water used and the amount used, but is generally 0.01 to 5% by mass, more preferably 0% in the developing solution at the time of use. It is made to contain in the range of 0.01-0.5 mass%.

(Acetylene alcohol and acetylene glycol)
It is preferable to add to the developer used in the present invention at least one compound selected from acetylene alcohol and acetylene glycol as an antifoaming agent for the developer. These compounds may be used alone or in combination.
Acetylene alcohol is an unsaturated alcohol having an acetylene bond (triple bond) in the molecule. Acetylene glycol is also called alkynediol, and is an unsaturated glycol having an acetylene bond (triple bond) in the molecule.
Specific examples include those represented by the following general formulas (C) and (D).

In the general formula (C) and (D), each of R ⁵ to R ^7, represents a linear or branched alkyl group having 1 to 5 carbon atoms, a + b is a number of 0 to 30. Examples of the linear or branched alkyl group having 1 to 5 carbon atoms include a methyl group, an ethyl group, an isopropyl group, an isobutyl group, and an isopentyl group.
Specific examples are shown below, but the present invention is not limited thereto.

These acetylene alcohols and acetylene glycols are commercially available, and are commercially available, for example, from Air Products and Chemicals Inc. The trade name of Safinol is known.
Specific examples of commercially available products include safinol 61 as (3), orphine B as (4), orphine P as (5), orphine Y as (7), safinol 82 as (8), 9) includes Safinol 104 and Olphine AK-02, (10) includes the Safinol 400 series, and (11) includes Safinol DF-110.
The addition amount of the antifoaming agent in the developer is preferably 0.0001% by mass or more, particularly preferably 0.0005 to 0.1% by mass from the viewpoint of the defoaming effect and printing durability. .

  Further, an alkali metal salt of an organic acid or an alkali metal salt of an inorganic acid may be added to the developer according to the present invention as a development regulator. For example, sodium carbonate, potassium, ammonium, sodium citrate, potassium, ammonium and the like may be used alone or in combination of two or more.

(Alkaline agent)
Examples of the alkaline agent used in the developer according to the present invention include tribasic sodium phosphate, potassium, ammonium, sodium borate, potassium, ammonium, sodium hydroxide, potassium, ammonium, and lithium. Inorganic alkaline agents such as monomethylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, monoisopropylamine, diisopropylamine, triisopropylamine, n-butylamine, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine And organic alkali agents such as diisotopanolamine, ethyleneimine, ethylenediamine, pyridine, and tetramethylammonium hydroxide. In the present invention, these may be used alone or in combination of two or more.

  Moreover, alkali silicate can be mentioned as alkali agents other than the above. Alkali silicates may be used in combination with a base. The alkali silicate to be used exhibits alkalinity when dissolved in water, and examples thereof include sodium silicate, potassium silicate, lithium silicate, and ammonium silicate. These alkali silicates may be used alone or in combination of two or more.

The developer used in the present invention is composed of silicon oxide SiO ₂ which is a silicate component as a hydrophilizing component of a printing plate or dummy plate support, and alkali oxide M ₂ O (M is an alkali metal) as an alkali component. Or an ammonium group) and the concentration can be easily adjusted to an optimum range. The mixing ratio (SiO ₂ / M ₂ O molar ratio) of silicon oxide SiO ₂ and alkali oxide M ₂ O is the amount of unclean dirt caused by excessive dissolution (etching) of the anodic oxide film of the support. From the viewpoint of suppressing the generation of insoluble gas due to complex formation between dissolved aluminum and silicate, it is preferably in the range of 0.75 to 4.0, more preferably in the range of 0.75 to 3.5. Used in.

In addition, the alkali silicate concentration in the developer includes the effect of inhibiting dissolution (etching) of the anodic oxide film on the support, the developability, the effect of inhibiting precipitation and crystal formation, and the gelation during neutralization during waste From the viewpoint of the prevention effect and the like, the amount of SiO ₂ is preferably 0.01 to 1 mol / L, more preferably 0.05 to 0.8 mol / L with respect to the mass of the developer.

  In the developer in the present invention, the following components can be used in combination with the above components, if necessary. For example, benzoic acid, phthalic acid, p-ethylbenzoic acid, pn-propylbenzoic acid, p-isopropylbenzoic acid, pn-butylbenzoic acid, pt-butylbenzoic acid, pt-butylbenzoic acid Organic carboxylic acids such as p-2-hydroxyethylbenzoic acid, decanoic acid, salicylic acid, 3-hydroxy-2-naphthoic acid; isopropyl alcohol, benzyl alcohol, ethyl cellosolve, butyl cellosolve, phenyl cellosolve, propylene glycol, diacetone alcohol, etc. In addition to these, there may be mentioned reducing agents, dyes, pigments, water softeners, preservatives and the like.

  The developer in the present invention preferably has a pH in the range of 10 to 12.5 at 25 ° C., more preferably in the range of pH 11 to 12.5. Since the developer of the present invention contains the surfactant, it exhibits excellent developability in non-image areas even when such a low pH developer is used. Thus, by setting the pH of the developing solution to a relatively low value, damage to the image area during development is reduced and the handling property of the developing solution is excellent.

The conductivity x of the developer is preferably 2 <x <30 mS / cm, more preferably 5 to 25 mS / cm.
Here, it is preferable to add an alkali metal salt of an organic acid, an alkali metal salt of an inorganic acid, or the like as a conductivity adjusting agent for adjusting the conductivity.

[Plate making]
The CTP plate making system 100 described above generally operates as follows. Here, FIG. 5 is a block diagram schematically showing the flow of processing of the plate making apparatus.
First, the printing plate precursor and the dummy plate precursor are stored in advance in the plate storage cassette of the plate setter 10.
When the plate making start switch of the device is pressed from the input unit 97 such as a keyboard connected to the control device 95, the control device 95 prints on the platesetter 10 in accordance with an instruction from the host system such as plate making data. While transmitting exposure data for the plate precursor, the automatic processor 60 is notified of an identification signal for determining whether the plate to be developed is a printing plate precursor or a dummy plate precursor, processing area information of the plate to be developed, etc. To do. The input unit 97 may be a sensor provided in the plate setter 10, the heating oven 40, and the automatic processor 60, and the sensor determines whether the printing plate precursor or the dummy plate precursor is used, and outputs an identification signal. It is good. The sensor is preferably a color sensor.

Based on the exposure data from the control device 95 and the exposure presence / absence command, the plate setter 10 performs image exposure on the printing plate precursor and sends the exposed printing plate precursor to the heating oven 40, while the dummy plate. The original plate is automatically conveyed through the plate setter 10 as it is without being exposed to the laser, and is sent to the heating oven 40.
When the processing plate is a printing plate precursor, the heating oven 40 promotes image formation by exposure by predetermined heating and conveys the image to the automatic developing device 60.

  In the present invention, the control device 95 is an identification number indicating the type of plate so that the conveyance speed of the dummy plate precursor can be controlled more easily in the heating oven 40 or the automatic processor 60 than in the case of the printing plate precursor. In addition, the conveyance speed command is output to the heating oven 40 and the automatic processor 60. In addition, the control device 95 not only identifies the plate type but also replenishes development in order to maintain the pH and conductivity of the alkaline developer 82 in the developing layer 81 in the automatic developing machine 60 in an appropriate state. A control command for the amount of liquid replenishment such as a stock solution or a thinning solution is also output to the automatic processor 60.

Specifically, the control device 95 determines the conveyance speed in the heating oven 40 and the automatic developing machine 60 according to the procedure shown in FIG. 6, and outputs a conveyance speed command to each part. Further, the control device 95 determines the liquid replenishment amount in the automatic developing machine 60 according to the procedure shown in FIG. 6, and outputs a liquid replenishment amount control command to the automatic developing machine 60.
First, it is determined whether or not an identification signal indicating that the plate to be developed is a printing plate precursor is transmitted from a host system (computer) (step 21; hereinafter abbreviated as S21), and the plate is the printing plate precursor. If there is an identification signal indicating that, the table I in which the heating processing in the heating oven 40 and the automatic developing machine 60 for the processing of the printing plate precursor is set is selected as the transport speed condition from the following Table 1. (S22).
Then, a command and data for executing an exposure process are transmitted to the plate setter 10 (S23), and a normal transport speed command for the printing plate precursor is transmitted to the heating oven 40 and the automatic processor 60, respectively (S23). S24, S25). In S25, at the same time, a control command indicating that the liquid replenishing amount for the normal printing plate precursor is sent to the automatic processor 60.

On the other hand, if it is determined in S21 that there is no identification signal indicating that the plate is a printing plate precursor, the process proceeds to S31, where an identification signal indicating that it is a dummy plate precursor has been transmitted from a higher system. If there is an identification signal indicating that it is a dummy original plate, the conveyance processing in the heating oven 40 and the automatic processor 60 for the processing of the dummy original plate is set from the following Table 1. Table II is selected as a conveyance speed condition (S32).
Then, a conveyance speed command for the dummy original plate is transmitted to the heating oven 40 and the automatic developing machine 60 (S33, S34). In S34, at the same time, a control command indicating that the liquid replenishment amount is for the dummy plate precursor is transmitted to the automatic processor 60.
On the other hand, if it is determined in S31 that there is no identification signal indicating that the plate is a dummy plate precursor, it means that neither the printing plate precursor nor the dummy plate precursor has been processed. In this case, the process ends.

  In Table 1 above, Table II shows pattern examples (1) to (4) in which the conveyance speeds are different. These patterns can be designated in advance in accordance with the developability and printing stain resistance required for the dummy original plate.

The printing plate and the dummy plate obtained by passing through the heating oven 40 and the automatic developing device 60 as described above are placed on an offset printing machine and used for printing a large number of sheets.
As plate cleaners used for removing stains on the plate during printing, conventionally known plate cleaners for PS plates are used. For example, CL-1, CL-2, CP, CN-4, CN, CG-1, PC-1, SR, IC (made by Fuji Photo Film Co., Ltd.), etc. are mentioned.

  Next, the photosensitive lithographic printing plate precursor and the lithographic printing plate dummy plate precursor used in the present invention will be described.

[Dummy plate master for lithographic printing]
As the dummy original plate used in the present invention, any plate can be used as long as the absorbance X has an absorption maximum of 0.20 or more in the 350 to 800 nm region. A plurality of maximum absorptions may exist in the range of 350 to 800 nm.
As the dummy plate precursor in the present invention, a dummy plate precursor having a non-photosensitive protective layer on the support can be developed in the same CTP plate making system as the photosensitive lithographic printing plate precursor. preferable.
Hereafter, each element which comprises the dummy plate in this invention is demonstrated in detail.

[Non-photosensitive protective layer]
The non-photosensitive protective layer in the present invention will be described.
The non-photosensitive protective layer contains a water-soluble binder polymer or a water-insoluble and alkali-soluble binder polymer (hereinafter sometimes simply referred to as “binder polymer”), a colorant, and a low molecular acid compound, It is preferable that the absorbance X has an absorption maximum of 0.20 or more in a region of 350 to 800 nm.

(Binder polymer)
In the non-photosensitive protective layer in the present invention, a water-soluble binder polymer or a water-insoluble and alkali-soluble binder polymer is used as the binder polymer. Among these, the water-soluble binder polymer tends to adhere to the slip sheet inserted between the plates, and thus the water-insoluble and alkali-soluble binder polymer is preferable.

  In the present invention, the water-insoluble and alkali-soluble binder polymer preferably has an acid content of 0.1 to 3.0 meq / g, more preferably 0.2 to 2.0 meq / g, and is substantially water-insoluble (that is, It is an organic polymer compound that is insoluble in a neutral or acidic aqueous solution and has film-forming properties, and can be dissolved or swelled in an alkaline aqueous solution. If the acid content is less than 0.1 meq / g, it is difficult to dissolve in an alkaline aqueous solution. If the acid content exceeds 3.0 meq / g, the film strength tends to decrease particularly during storage at high temperature and high humidity.

  The molecular weight of the binder polymer is not particularly limited as long as it dissolves in the coating solvent and dissolves or swells in the aqueous alkali solution. However, from the viewpoint of the balance between film strength and alkali water solubility, the weight average molecular weight is 1,000 to 1,000,000 is preferable, and 10,000 to 500,000 is more preferable.

  The content of the binder polymer in the non-photosensitive protective layer is preferably 30% by mass or more, and 40% by mass or more and 95% by mass or less from the viewpoint of protecting the support and preventing adhesion of dirt such as fingerprint marks. More preferably, it is 50 mass% or more and 90 mass% or less is especially preferable.

  Particularly suitable binder polymers include copolymers containing acrylic acid, methacrylic acid, crotonic acid or maleic acid as essential components, such as 2-hydroxyethyl acrylate as described in JP-A-50-118802 or 2 A multi-component copolymer with hydroxyethyl methacrylate, acrylonitrile or methacrylonitrile, acrylic acid or methacrylic acid and optionally other copolymerizable monomers, as described in JP-A-53-120903 Copolymer with acrylic acid or methacrylic acid, acrylic acid, or methacrylic acid and optionally other copolymerizable monomers esterified with a group containing a hydroxy group and containing a dicarboxylic acid ester residue Fragrances as described in JP-A-54-98614 A multi-component copolymer of a monomer having a terminal hydroxyl group (for example, N- (4-hydroxyphenyl) methacrylamide), acrylic acid or methacrylic acid and, if necessary, other copolymerizable monomers, Mention may be made of multi-component copolymers comprising alkyl acrylates, acrylonitrile or methacrylonitrile and unsaturated carboxylic acids as described in JP-A-56-4144. In addition, acidic polyvinyl alcohol derivatives and acidic cellulose derivatives are also useful. Also useful are binders described in JP-B-54-19773, JP-A-57-94747, JP-A-60-182437, JP-A-62-58242, and JP-A-62-212353, in which polyvinyl acetal and polyurethane are solubilized with alkali. A resin obtained by alkali-solubilizing polyurethane and a resin containing a styrene skeleton as a copolymerization component are particularly preferable because of high film strength.

  Examples of the water-soluble binder polymer include binder polymers described in JP-A-3-170590, JP-A-2951907, JP-A-11-227350, and JP-A-2003-25748. Specifically, gum arabic, gelatin, polyvinyl alcohol resin, dextrin, alginate, polyacrylic acid, hydroxyethylcellulose, carboxyethylcellulose, polyvinylpyrrolidone, polyacrylamide, methylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, polystyrenesulfonic acid and its salts , Polyacrylamide-2-methylpropanesulfonic acid and salts thereof, and polyvinylphosphonic acid.

(Coloring agent)
The non-photosensitive protective layer in the present invention contains a colorant. Thus, the color sensor suitability can be imparted by incorporating the colorant.
Since the non-photosensitive protective layer in the present invention has an absorption maximum in the region of 350 to 800 nm and the absorbance X at the absorption maximum is preferably 0.2 or more, the composition forming the non-photosensitive protective layer It is preferable to add a colorant having an absorption maximum at 350 to 800 nm.

  As addition amount of a coloring agent, 0.5-10 mass% is preferable with respect to solid content of a non-photosensitive protective layer, and 1.0-8.0 mass% is more preferable. The content of the colorant is set in consideration of the thickness of the non-photosensitive protective layer.

As the colorant in the present invention, a dye or a pigment can be used, but a dye soluble in a developer is preferable.
Oxonol dyes, hemioxonol dyes, merocyanine dyes, cyanine dyes, azo dyes and the like can be used as dyes used as colorants in the non-photosensitive protective layer. Specifically, for example, a pyrazolone dye described in JP-B-58-12576, a pyrazolone oxonol dye described in US Pat. No. 2,274,782, a diarylazo dye described in US Pat. No. 2,956,879, U.S. Pat. Nos. 3,423,207 and 3,384,487, styryl dyes and butadienyl dyes, U.S. Pat. No. 2,527,583, merocyanine dyes, U.S. Pat. No. 3,486,897 Nos. 3,652,284 and 3,718,472, merocyanine dyes and oxonol dyes, enaminohemioxonol dyes described in U.S. Pat. No. 3,976,661 and British Patent No. 584,609, 1,177,429, JP-A-48-85130, 49-99620, 49-114420, USA No. 2,533,472, 3,148,187, 3,177,078, 3,247,127, 3,540,887, 3,575 , 704, and 3,653,905, are used.

  Among these dyes used as the colorant, those having an absorption with an absorbance of 0.2 or more in the region of 400 to 550 nm are particularly preferred when incorporated in the non-photosensitive protective layer.

  Specific examples of preferred dyes as the colorant according to the present invention will be given below, but the present invention is not limited thereto.

  Examples of pigments that can be used as a colorant in the non-photosensitive protective layer include C.I. I Pigment Yellow 1, C.I. I Pigment Yellow 2, C.I. I Vat Yellow 20, C.I. I Vat Yellow 3, Flavanthrone Yellow, C.I. I Pigment Orange 5, C.I. I Vat Orange 3, C.I. I Vat Orange 9, Toluidine Red, C.I. Examples thereof include pigments described in “Dye Handbook” such as I Vat Red 35 (edited by Organic Chemistry Association) (Maruzen Co., Ltd.).

-Absorbance-
The absorbance at the absorption maximum of the non-photosensitive protective layer needs to be 0.20 or more, more preferably 0.30 or more and 1.5 or less, and further preferably 0.40 or more and 1.0 or less. is there. If the absorbance is less than 0.20, the discrimination by the color sensor is unstable, and if it is 1.5 or more, there may be a residual color when stored for a long time.
This absorbance is determined by the amount of colorant added and the thickness of the non-photosensitive protective layer. As the absorbance in the present invention, a value measured by a U-3010 type spectroaltimeter reflection spectrum measuring apparatus manufactured by Shimadzu Corporation with reference to a support not coated with a non-photosensitive protective layer is used.

(Low molecular acid compounds)
The non-photosensitive protective layer in the present invention preferably contains a low molecular acid compound.
Low molecular acid compounds can be classified by the type of acid group, such as phosphoric acid / phosphonic acid compounds, sulfonic acid compounds, and carboxylic acid compounds. Depending on the type of acid group of this low molecular acid compound, the effect of preventing the occurrence of residual color after development by suppressing the adsorption of the support of the colorant, and the penetration of the alkali developer into the non-photosensitive protective layer during printing can be prevented. Since the contribution rate to the contamination prevention effect is different, the best result can be obtained by combining a plurality of types of low molecular acid compounds.

Further, “low molecule” in the low molecular acid compound means that the weight average molecular weight is 300 or less. The weight average molecular weight of the low molecular acid compound is particularly preferably 250 or less. When the weight average molecular weight is larger than 300, the soiling property may be deteriorated.
In addition, although the acid group in the low molecular acid compound may form a salt structure, a free acidic hydrogen group is less likely to generate a residual color due to the colorant adsorbing to the support surface. preferable.

The content of the low molecular acid compound in the non-photosensitive protective layer is preferably 0.50 meq or more per 1 m ² as the lower limit from the viewpoint of the effect of preventing residual colors and printing stains. Particularly preferably, it is 1.00 meq or more per 1 m ² , and further preferably 1.50 meq or more. Further, from the viewpoint of adhesiveness with the slip sheet, the upper limit is preferably 5.00 meq or less per 1 m ² , and particularly preferably 4.00 meq or less.

Below, the low molecular acid compound applicable to this invention is described concretely.
As the low molecular acid compound, as described above, a phosphoric acid / phosphonic acid compound, a sulfonic acid compound, and a carboxylic acid compound are preferably used.

-Phosphoric acid / phosphonic acid compounds-
As the phosphoric acid / phosphonic acid compound, a compound having an oxygen acid group of phosphorus (hereinafter, appropriately referred to as “phosphorus oxygen acid compound”) is used. Phosphorus oxyacid compound means phosphoric acid, phosphonic acid, phosphinic acid, a hydrogen atom bonded to a phosphorus atom constituting the base structure of these acids, an optionally substituted hydrocarbon group, or a different group. Compounds obtained by substitution with a nodal ring group and esters of these acids having at least one P-OH group are included. Specific examples include the following.

Phosphoric acid, methyl phosphate, ethyl phosphate, propyl phosphate, butyl phosphate, phenyl phosphate, benzyl phosphate, dimethyl phosphate, diethyl phosphate, dipropyl phosphate, metaphosphate, pyrophosphate, triphosphate, tetra Phosphoric acid, dibutyl phosphate, diphenyl phosphate, dibenzyl phosphate; phosphonic acid, methylphosphonic acid, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, phenylphosphonic acid, p-chlorophenylphosphonic acid, p-bromophenylphosphonic acid, o-tolylphosphonic acid, m-tolylphosphonic acid, p-tolylphosphonic acid, phenylphosphonic methyl, phenylphosphonic acid ethyl, phenylphosphonic acid propyl, phenylphosphonic acid butyl, acetylphosphonic acid; phosphinic acid, methylphosphinic acid, ethylphosphine Acid, propylphos Phosphoric acid, butylphosphinic acid, phenylphosphinic acid, benzylphosphinic acid, dimethylphosphinic acid, diethylphosphinic acid, dipropylphosphinic acid, dibutylphosphinic acid, diphenylphosphinic acid, ethylmethylphosphinic acid, 2-furylphosphinic acid; And alkali metal salts, alkaline earth metal salts and ammonium salts thereof.
Among these, phosphonic acid and phosphoric acid are most preferable.

-Sulphonic acid compounds-
As the sulfonic acid compound, a compound having a sulfonic acid group (hereinafter, appropriately referred to as “sulfonic acid compound”) is used. The sulfonic acid compound is a compound in which one or more sulfonic acid groups are substituted on a hydrocarbon group which may have a substituent or a heterocyclic ring group and which does not have a phosphorus oxyacid group. means. Specific examples include the following.

o-hydroxybenzenesulfonic acid, m-hydroxybenzenesulfonic acid, p-hydroxybenzenesulfonic acid, 2,4-dihydroxybenzenesulfonic acid, 2,5-dihydroxybenzenesulfonic acid, 2,6-dihydroxybenzenesulfonic acid, o- Formylbenzenesulfonic acid, 2-hydroxy-5-formylbenzenesulfonic acid, 2-sulfobenzoic acid, 3-sulfobenzoic acid, 4-sulfobenzoic acid, 3-sulfophthalic acid, 4-sulfophthalic acid, 2-sulfoterephthalic acid, 5-sulfoisophthalic acid, 5-sulfosalicylic acid, 1,3-benzenedisulfonic acid, pyridine-2-sulfonic acid, 2-hydroxypyridine-5-sulfonic acid, 4-sulfodiphenylamine, 1,6-naphthalenedisulfonic acid, 2 -Hydroxy-4-methoxy-5-ben Etc. yl benzenesulfonic acid, and alkali metal salts thereof, alkaline earth metal salts, such as ammonium salts.
Among these, the most preferable one has two or more carboxyl groups and one sulfonic acid group in an aromatic ring such as 3-sulfophthalic acid, 4-sulfophthalic acid, 2-sulfoterephthalic acid, and 5-sulfoisophthalic acid. Compounds, compounds having a hydroxyl group, a carboxyl group, and a sulfonic acid group in the aromatic ring, such as 5-sulfosalicylic acid, and 2-hydroxy-4-methoxy-5-benzoylbenzenesulfonic acid.

-Carboxylic acid compound-
As the carboxylic acid compound, a compound having a carboxyl group (hereinafter, appropriately referred to as “carboxylic acid compound”) is used. As the carboxylic acid compound, those having two or more carboxyl groups in one molecule are preferred, and those having three or more carboxyl groups are particularly preferred.

  Specific examples of carboxylic acid compounds having one carboxyl group include glycolic acid, thioglycolic acid, lactic acid, β-hydroxypropionic acid, pyruvic acid, salicylic acid, β-alanine, phenylalanine, N-ethylglycine and the like. Can do.

  Specific examples of the carboxylic acid compound having two carboxyl groups include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, phthalic acid. Examples include acid, isophthalic acid, terephthalic acid, tartaric acid, malic acid, dipicolinic acid, citric acid, and the like. Among these, oxalic acid, tartaric acid, malic acid, and dipicolinic acid are particularly preferable.

In addition, a low molecular organic compound having three or more carboxyl groups as exemplified in the following specific examples and having no other functional group containing elements other than carbon and hydrogen is also particularly preferable as the carboxylic acid compound. .
Specific examples thereof include, for example, propane-1,2,3-tricarboxylic acid, butane-1,2,3-tricarboxylic acid, butane-1,2,4-tricarboxylic acid butane-1,2,3,4. -Tetracarboxylic acid, 2-carboxymethylpropane-1,3-dicarboxylic acid, pentane-1,2,3-tricarboxylic acid, pentane-1,2,4-tricarboxylic acid, pentane-1,2,5-tricarboxylic acid , Pentane-1,3,4-tricarboxylic acid, pentane-2,3,4-tricarboxylic acid, pentane-1,2,3,4-tetracarboxylic acid, pentane-1,2,3,5-tetracarboxylic acid 2-carboxymethylbutane-1,3-dicarboxylic acid, 2-carboxymethylbutane-1,4-dicarboxylic acid, 3-carboxymethylbutane-1,2-dicarboxylic acid, 3- Ruboxymethylbutane-1,2,4-tricarboxylic acid, 2,2-dicarboxymethylpropane-1,3-dicarboxylic acid, 1,2,3,4-cyclopentanetetracarboxylic acid, hemimerlic acid, trimellit Examples include acid, trimesic acid, pyromellitic acid, naphthalene-1,4,5,8-tetracarboxylic acid.
Among these, particularly preferred are those in which 3 or more carboxyl groups are substituted on an alkyl group having 5 or less carbon atoms, and most preferred is propane-1,2,3-tricarboxylic acid.

Among the oxygen oxyacid compounds, sulfonic acid compounds, and carboxylic acid compounds described above, in particular, phosphonic acid, phosphoric acid, phenylphosphonic acid, dipicolinic acid, malic acid, sulfosalicylic acid, sulfophthalic acid, tricarballylic acid, sulfophthalic acid. Acid and sulfosalicylic acid are preferable because they have a dissolution promoting effect and an excellent colorant adsorption preventing effect, and also have a printing stain preventing effect during long-term storage.
In the present invention, it is most preferable to use a phosphoric acid / phosphonic acid compound, a sulfonic acid compound, and a carboxylic acid compound in combination.

  The content of the oxygen acid compound, sulfonic acid compound, and carboxylic acid compound of phosphorus described above in the non-photosensitive protective layer is the total solid of the non-photosensitive protective layer from the viewpoint of storage stability and scratch resistance of the dummy plate. The content is preferably 0.01 to 20% by mass, more preferably 0.1 to 5% by mass, respectively. Furthermore, in the non-photosensitive protective layer, the total content of phosphorus oxygen acid compound, sulfonic acid compound, and carboxylic acid compound is 20 masses with respect to the total solid content of the non-photosensitive protective layer from the viewpoint of scratch resistance. % Is preferably not exceeded.

(Other additives)
In addition to the above-described components, various additives can be used in combination with the non-photosensitive protective layer in the present invention.
Examples of other additives include plasticizers for promoting dissolution, coating surface quality improving agents such as fluorine-based surfactants, and the like.
The conventional dummy plate has protrusions provided independently on the non-photosensitive layer protective layer for the purpose of improving scratch resistance of the dummy plate and preventing adhesion of the dummy plates during storage of the dummy plate. It was preferred to provide a matte layer. However, in the dummy plate suitably used in the CTP apparatus as in the present invention, there is a concern that the projection of the mat layer may drop off and contaminate the inside of the plate setter, or the contamination may cause problems such as image defects. In order to suppress this, it is preferable not to provide a mat layer.

(Membrane pH)
The film pH of the non-photosensitive protective layer is preferably 2.5 to 5.5, and particularly preferably 3.0 to 5. from the viewpoint of preventing adsorption of the colorant and preventing corrosion of the anodic oxide coating applied to the support. 2 is preferred. The film PH is a value obtained by immersing and dissolving a 400 cm ² dummy plate in 100 g of 2-methoxyethanol, adding 30 cc of pure water, and measuring pH.

(Formation of non-photosensitive protective layer)
The non-photosensitive protective layer in the present invention is prepared by dissolving each component for forming the non-photosensitive protective layer in various known coating solvents to prepare a coating solution for forming the non-photosensitive protective layer, and on the support. Further, it can be formed by coating and drying.

  1.0-50 mass% is suitable for the solid content concentration in the coating liquid for non-photosensitive protective layer formation at the time of application | coating, Preferably it is 2.0-30 mass%.

As a method for applying the non-photosensitive protective layer-forming coating solution on the support, conventionally known methods such as roll coating, bar coating, spray coating, curtain coating, and spin coating can be used.
The support on which the coating solution for forming the non-photosensitive protective layer is applied is preferably dried at 50 to 150 ° C. The drying method may be that the temperature is initially lowered and preliminarily dried and then dried at a high temperature or directly at a high temperature.
The dry coating weight of the non-photosensitive protective layer is preferably 0.2 to 1.5 g / m ² from the viewpoint of scratch prevention ability and dissolution and removal performance during development, and is preferably 0.3 to 1.0 g / m ^2. more preferably m ^2.

[Support]
As the support used for the dummy original plate of the present invention, it is preferable to use a support subjected to a hydrophilic treatment. Such a hydrophilized support is obtained by subjecting the support surface to a hydrophilization treatment as will be described in detail below.

-Support substrate-
The support substrate applied to the dummy plate precursor of the present invention is preferably a metal support. Specifically, aluminum and an aluminum-coated composite support are preferable, and further, iron is 0.1 to 0.5% by mass, silicon is 0.03 to 0.3% by mass, and copper is 0.001 to 0%. It is more preferably a 1S aluminum plate containing 0.03% by mass and further 0.002 to 0.1% by mass of titanium.

The surface of the aluminum plate is preferably surface-treated. As the surface treatment, an alkali treatment, preferably 5 to 15% aqueous solution of an alkali agent selected from sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate and the like at a temperature of 20 to 80 ° C. A process of etching by dipping for 2 seconds to 250 seconds is preferable.
Aluminum ions may be added to the etching bath by about one fifth of the alkali. Subsequently, it is immersed in a 10 to 30% by mass nitric acid or sulfuric acid aqueous solution at a temperature of 20 to 70 ° C. for 5 seconds to 25 seconds to perform neutralization and smut removal after alkali etching.

Other surface treatments include, for example, a roughening treatment, and as such a roughening treatment method, generally known brush polishing methods, ball polishing methods, electrolytic etching, chemical etching, liquids, etc. Examples of the method include honing and sandblasting, and combinations thereof. Among these, preferable roughening treatment includes brush polishing, electrolytic etching, chemical etching, and liquid honing. Further, among these, a roughening method including the use of electrolytic etching is particularly preferable. Furthermore, as described in JP-A-54-63902, a method of performing electrolytic etching after brush polishing is also preferable.
As an electrolytic bath when electrolytic etching is used for the surface roughening treatment, an aqueous solution containing an acid, an alkali or a salt thereof or an aqueous solution containing an organic solvent is used. An electrolyte containing a salt is preferred. For brush polishing, it is preferable to use a pumiston-water suspension and a nylon brush, and the average surface roughness is preferably 0.25 to 0.9 μm.

The electrolytic solution used for the electrolytic etching treatment is an aqueous solution of hydrochloric acid or nitric acid, and the concentration is preferably used in the range of 0.01 to 3% by mass, and further 0.05 to 2.5% by mass. preferable. In addition, the electrolyte includes a corrosion inhibitor (or stabilizer) such as nitrate, chloride, monoamines, diamines, aldehydes, phosphoric acid, chromic acid, boric acid, ammonium oxalate, as necessary, A graining agent or the like can be added. Further, the electrolyte solution may contain an appropriate amount (1 to 10 g / liter) of aluminum ions.
The electrolytic etching treatment is usually performed at a temperature of the electrolytic solution of 10 to 60 ° C. The alternating current used at this time can be any of rectangular, trapezoidal, and sinusoidal, as long as the positive and negative polarities are alternately exchanged. Phase alternating current can be used. The current density is preferably 5 to 100 A / dm ² and is preferably treated for 10 to 300 seconds.

In the present invention, when an aluminum (alloy) support is used, its surface roughness is preferably adjusted to 0.2 to 0.8 μm according to the amount of electricity. Further, the roughened aluminum support is subjected to desmut treatment with an aqueous solution of acid or alkali as necessary. The grained aluminum alloy support is removed and etched (preferably with 10-50 mass% hot sulfuric acid (40-60 ° C.) or dilute alkali (sodium hydroxide, etc.). In the range of 0.01 to 2.0 g / m ² ). When the smut is removed and etched with an alkali, it is subsequently neutralized by immersion in an acid (specifically, nitric acid or sulfuric acid) for cleaning.

  After removing the surface smut, an anodized film is provided. As the anodic oxidation method, a conventionally known method can be used, but sulfuric acid is used as the most useful electrolytic solution. Next, phosphoric acid is also a useful electrolyte. Furthermore, a mixed acid of sulfuric acid and phosphoric acid disclosed in JP-A-55-28400 is also useful.

The sulfuric acid method is usually treated with a direct current, but alternating current can also be used. Electrolytic treatment is performed for 5 to 250 seconds in a temperature range of 20 to 60 ° C. with a sulfuric acid concentration of 5 to 30% by mass, and an oxide film of 1 to 10 g / m ² is provided on the surface. This electrolytic solution preferably contains aluminum ions. Moreover this time the current density is preferably 1 to 20A / dm ^2.
In the case of the phosphoric acid method, it is processed at a current density of 1 to 15 A / dm ² for 10 to 300 seconds at a phosphoric acid concentration of 5 to 50% by mass and a temperature of 30 to 60 ° C.

  Further, after the graining process and the anodization, a sealing process can be performed. Such a sealing treatment is performed by immersion in a hot aqueous solution containing hot water and an inorganic salt or an organic salt, and a steam bath.

-Hydrophilization treatment-
Examples of the hydrophilization treatment of the support surface in the present invention include treatment with an alkali metal silicate (eg, treatment with an aqueous sodium silicate solution), treatment with a water-soluble resin, and the like. Such hydrophilic treatments may be applied in combination. The hydrophilization treatment using a water-soluble resin may be a treatment in which the support substrate is immersed in a solution in which the water-soluble resin is dissolved, or a treatment in which a solution in which the water-soluble resin is dissolved is applied to the support substrate. May be. Examples of the water-soluble resin used include those exemplified as the binder polymer in the non-photosensitive protective layer. The hydrophilization treatment is performed after the roughening treatment or the anodizing treatment performed as desired.

Specific examples of the hydrophilization treatment that can be applied to the present invention include the treatments exemplified below. That is, for example, silicate (sodium silicate, potassium silicate) treatment described in US Pat. No. 2,714,066 and US Pat. No. 3,181,461, US Pat. No. 946,638, potassium fluoride zirconate treatment, U.S. Pat. No. 3,201,247, phosphomolybdate treatment, British Patent No. 1,108,559 Alkyl titanate treatment described in German Patent No. 1,091,433, polyacrylic acid treatment described in German Patent No. 1,134,093 and British Patent No. 1,230 No. 4,447, phosphonic acid treatment described in Japanese Patent Publication No. 44-6409, US Pat. No. 3,307,951 Treatment with a salt of a hydrophilic organic polymer compound and a divalent metal described in JP-A Nos. 58-16893 and 58-18291 Hydrophilization treatment etc. are mentioned. Silicate treatment is particularly preferred because of its high hydrophilization ability and simple treatment.
In addition, silicate electrodeposition described in US Pat. No. 3,658,662 can also be mentioned.

[Photosensitive planographic printing plate precursor]
Next, the photosensitive lithographic printing plate precursor used in the present invention will be described.
The photosensitive lithographic printing plate precursor used in the present invention is characterized in that the difference between the absorbance Y at the maximum absorption wavelength of the dummy plate precursor and the absorbance X at the maximum absorption wavelength of the dummy plate precursor is 0.10 or more. . Because of such characteristics, suitability for color sensors can be provided.
The photosensitive lithographic printing plate precursor is not limited as long as it is used as a CTP-compatible photosensitive lithographic printing plate precursor. Specifically, the photopolymer system described in JP-A-2003-84450 is used. Examples include a lithographic printing plate precursor, a thermal negative lithographic printing plate precursor described in Japanese Patent Application No. 2004-008379, or a thermal negative lithographic printing plate precursor described in JP-A No. 11-218914. In these photosensitive lithographic printing plate precursors, from the viewpoint of printing durability, the photosensitive layer is preferably 1.0 g / m ² or more, more preferably in the range of 1.0 to 3.0 g / m ^2. .

[Interleaf]
As the slip sheet used in the present invention, any slip sheet used for protecting the plate surface of the photosensitive lithographic printing plate precursor or the dummy plate precursor may be used, but may not be used. Absent. Specific examples of the interleaf paper include, for example, paper containing wax (Japanese Patent Publication No. 61-19025), paper containing fatty acid or a salt thereof (Japanese Patent Laid-Open No. 57-99647). ), Polyolefin pulp, and alkali metal halide (JP-A-57-99647), etc., and slip sheets coated with plastic such as polyethylene film (JP-B-57-23259), Applying or adding a paper strength agent such as starch, a synthetic sizing agent, aluminum sulfate, etc. (Japanese Patent Laid-Open No. 10-282681), or applying a paper strength agent, an inorganic electrolyte, or a wetting agent to the paper material, A coated or added conductive agent such as a cationic polymer electrolyte or conductive zinc oxide (Japanese Patent Laid-Open No. 10-197992), a fluorine-based surfactant, fluorine-based surfactant Butter, silicone resins, those obtained by adding a sizing agent or the like (JP-A 9-292713 JP) and the like. Other examples include slip sheets described in Japanese Patent Application Nos. 2000-96475, 2000-70263, 2000-58533, 2000-58515, 11-319169, and the like.

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited thereto.
[Examples 1 to 6, Comparative Examples 1 and 2]
[Preparation of dummy plate precursors 1-16 for lithographic printing]
(Production of support)
Thickness of JIS A 1050 aluminum material containing 99.5% by mass aluminum, 0.01% by mass copper, 0.03% by mass titanium, 0.3% by mass iron, and 0.1% by mass silicon. A 30 mm rolled plate was grained on its surface using a 20-mesh aqueous suspension of 400 mesh Pamiston (manufactured by Kyoritsu Ceramics) and a rotating nylon brush (6,10-nylon), and then washed thoroughly with water. did.

This was immersed in a 15% by mass sodium hydroxide aqueous solution (containing 4.5% by mass of aluminum) and etched so that the dissolved amount of aluminum was 5 g / m ² , and then washed with running water. Further, neutralized with 1% by mass nitric acid, and then in a 0.7% by mass nitric acid aqueous solution (containing 0.5% by mass of aluminum), a rectangular wave having an anode voltage of 10.5 volts and a cathode voltage of 9.3 volts Using an alternating waveform voltage (current ratio r = 0.90, current waveform described in the example of Japanese Examined Patent Publication No. 58-5796), electrolytic surface roughening treatment was performed at an anode time electricity of 160 coulomb / dm ^2. It was. After washing with water, it was immersed in a 10% by mass aqueous sodium hydroxide solution at 35 ° C., etched so that the aluminum dissolution amount was 1 g / m ² , and then washed with water. Next, it was immersed in an aqueous sulfuric acid solution at 50 ° C. and 30% by mass, desmutted, and washed with water.

Furthermore, the porous anodic oxide film formation process was performed using a direct current in 20 mass% sulfuric acid aqueous solution (containing 0.8 mass% of aluminum) at 35 ° C. That is, electrolysis was performed at a current density of 13 A / dm ² , and the anodic oxide film mass was adjusted to 2.7 g / m ² by adjusting the electrolysis time.
The aluminum support obtained as described above had a reflection density of 0.30 and a center line average roughness of 0.58 μm as measured with a Macbeth RD920 reflection densitometer.

(Hydrophilic treatment)
The obtained aluminum support was washed with water, immersed in a 3% by mass aqueous solution of sodium silicate at 70 ° C. for 30 seconds, washed with water and dried. Further, the film was dipped in the following coating solution for hydrophilic treatment at 30 ° C. for 30 seconds and then dried at 90 ° C. for 30 seconds.

<Coating liquid for hydrophilic treatment>
・ 0.4 g of solution containing polymer compound A having the following structure
(Isopropyl alcohol / water = 32% by weight solution of 1/1)
・ Methanol 5.6g

(Formation of non-photosensitive protective layer)
Next, the following non-photosensitive protective layer coating solution [Q-1] was prepared and applied to the above aluminum support using a wire bar. Drying was carried out at 90 ° C. for 27 seconds using a warm air dryer, and dummy plate precursors 1 to 16 for planographic printing plates were obtained. Table 2 shows the coating amount after drying.
After application of the non-photosensitive protective layer, the maximum absorption wavelength λ _max and the absorbance X at that wavelength were measured with a U-3010 spectrophotometer reflection spectrum measuring device manufactured by Shimadzu Corporation. The value measured with reference to a support with no layer applied was used. The results are shown in Table 2.

<Non-photosensitive protective layer coating solution [Q-1]>
-Binder polymer (compound described in Table 2) 0.395 g
・ Phosphoric acid (85 mass% aqueous solution) 0.08 g
・ Sulfophthalic acid (50% by weight aqueous solution) 0.017 g
・ Tricarballylic acid 0.017g
Colorant (compounds / amounts listed in Table 2)
・ Fluorine surfactant 0.009g
(Megafac F-780-F Dainippon Ink Chemical Co., Ltd.,
30% by mass solution of MEK)
・ Methyl ethyl ketone (MEK) 7.93g
・ Methanol 6.28g
・ 1-methoxy-2-propanol (MFG) 2.01 g

The structure of the binder polymer described in Table 2 is shown below.
Polyurethane A: Reaction product of the following four types of monomers (1) to (4) (MFG / MEK = 1/1 16% by mass solution, weight average molecular weight 85,000, acid content 1.64 meg / g)
(1) 4,4-diphenylmethane diisocyanate 37.5 mol%
(2) Hexamethylene diisocyanate 12.5 mol%
(3) 2,2-bis (hydroxymethyl) propionic acid 32.5 mol%
(4) Tetraethylene glycol 17.5 mol%
BP-1: Poly (p-hydroxystyrene) (Marca Linker MS-4P, manufactured by Maruzen Petrochemical Co., Ltd.)

[Preparation of photosensitive lithographic printing plate precursor A]
(Production of support)
The surface treatment shown below was performed using a JIS A 1050 aluminum plate having a thickness of 0.30 mm and a width of 1030 mm.

<Surface treatment>
In the surface treatment, the following various treatments (a) to (f) were continuously performed. In addition, after each process and water washing, the liquid was drained with the nip roller.
(A) The aluminum plate was etched at a caustic soda concentration of 26 mass%, an aluminum ion concentration of 6.5 mass%, and a temperature of 70 ° C. to dissolve the aluminum plate at 5 g / m ² . Thereafter, it was washed with water.
(B) A desmut treatment by spraying was performed with a 1% by mass aqueous solution of nitric acid having a temperature of 30 ° C. (including 0.5% by mass of aluminum ions), and then washed with water.

(C) An electrochemical surface roughening treatment was continuously performed using an alternating voltage of 60 Hz. The electrolytic solution at this time was a 1% by mass aqueous nitric acid solution (including 0.5% by mass aluminum ions and 0.007% by mass ammonium ions) at a temperature of 30 ° C. The AC power source was subjected to an electrochemical surface roughening treatment using a carbon electrode as a counter electrode using a trapezoidal rectangular wave alternating current with a time TP of 2 msec until the current value reached a peak from zero and a duty ratio of 1: 1. Ferrite was used for the auxiliary anode. The current density was 25 A / dm ² at the peak current value, and the amount of electricity was 250 C / cm ² in terms of the total amount of electricity when the aluminum plate was the anode. 5% of the current flowing from the power source was shunted to the auxiliary anode. Thereafter, it was washed with water.

(D) The aluminum plate was spray-etched at 35 ° C. with a caustic soda concentration of 26% by mass and an aluminum ion concentration of 6.5% by mass to dissolve the aluminum plate by 0.2 g / m ² , The removal of the smut component mainly composed of aluminum hydroxide generated during chemical roughening and the edge portion of the generated pit were dissolved to smooth the edge portion. Thereafter, it was washed with water.

(E) A desmut treatment by spraying was performed with a 25% by weight aqueous solution of sulfuric acid having a temperature of 60 ° C. (containing 0.5% by weight of aluminum ions), followed by washing with water by spraying.
(F) Anodization was performed for 50 seconds at a sulfuric acid concentration of 170 g / liter (containing 0.5 mass% of aluminum ions), a temperature of 33 ° C., and a current density of 5 (A / dm ² ). Thereafter, it was washed with water. The mass of the anodic oxide film at this time was 2.7 g / m ² .
The surface roughness Ra of the aluminum support thus obtained was 0.27 (measuring instrument: Surfcom manufactured by Tokyo Seimitsu Co., Ltd., stylus tip diameter 2 micrometer).

(Formation of undercoat layer)
Next, the following undercoat layer coating solution B was applied to the aluminum support with a wire bar and dried at 90 ° C. for 30 seconds. The coating amount was 10 mg / m ² .

<Undercoat layer coating solution B>
・ Polymer compound B having the following structure 0.05 g
・ Methanol 27g
・ Ion exchange water 3g

(Formation of photosensitive layer)
Next, the following photosensitive layer coating solution [P-1] was prepared and applied onto the undercoat layer using a wire bar. Drying was performed at 115 ° C. for 34 seconds using a warm air dryer. The coating amount after drying was 1.3 g / m ² .
After application of the photosensitive layer, the absorbance Y at the maximum absorption wavelength λ _max of the dummy plate precursors 1 to 16 described in Table 2 above was measured with a U-3010 type spectroaltimeter reflection spectrum measuring device manufactured by Shimadzu Corporation. The value measured on the basis of a support with no photosensitive layer applied was used. Based on the measurement results, the difference in absorbance (XY) at the maximum absorption wavelength λ _max of the dummy original plate was calculated. Table 2 shows the calculated results.

<Photosensitive layer coating solution [P-1]>
・ Infrared absorber (IR-1) 0.074g
-Polymerization initiator (OS-1) 0.280g
・ Additive (PM-1) 0.151g
・ Polymerizable compound (AM-1) 1.00 g
-Binder polymer (BT-1) 1.00g
・ Ethyl violet (C-1) 0.04g
・ Fluorine-based surfactant 0.015g
(Megafac F-780-F Dainippon Ink Chemical Co., Ltd.,
Methyl isobutyl ketone (MIBK) 30% by mass solution)
・ Methyl ethyl ketone 10.4g
・ Methanol 4.83g
・ 10.4 g of 1-methoxy-2-propanol

  The infrared absorber (IR-1), polymerization initiator (OS-1), additive (PM-1), polymerizable compound (AM-1), binder polymer (BT-) used in the photosensitive layer coating solution. The structures of 1) and ethyl violet (C-1) are shown below.

(Formation of protective layer (overcoat layer))
A mixed aqueous solution of polyvinyl alcohol (saponification degree 98 mol%, polymerization degree 500) and polyvinyl pyrrolidone (BASF Corp., Rubiscol K-30) was applied to the photosensitive layer surface with a wire bar, The sample was dried at 125 ° C. for 75 seconds using a type dryer. The content of polyvinyl alcohol / polyvinylpyrrolidone was 4/1% by mass, and the coating amount (coating amount after drying) was 2.30 g / m ² . Thus, a photosensitive lithographic printing plate precursor A was obtained.

[Catch cardboard]
Ten color (orange) manufactured by Shinfuji Paper Co., Ltd. was used as the hitting cardboard.

[Interleaf]
As the interleaf, interleaf paper F manufactured by Daiichi Container Co., Ltd. was used. The physical properties of the interleaf paper F are as shown in Table 1 below.

[Evaluation]
(Evaluation of suitability of color sensor)
Combine the dummy plate precursor and the photosensitive lithographic printing plate precursor A as shown in Table 4, and further check whether each element can be identified by the color sensor for the four elements including the contact ball and interleaf F. evaluated. The color sensor was a color sensor manufactured by Keyence Corporation (sensor unit: CZ-41, amplifier unit: CZ-V1). Those that can be distinguished were marked with ◯, and those that could not be judged with x. The results are shown in Table 4.

(Evaluation of plate making aptitude using CTP plate making system)
The obtained photosensitive lithographic printing plate precursor A and the interleaf paper F were alternately stacked to obtain an aggregate. Similarly, the obtained dummy plate precursor and the interleaf paper F were alternately stacked to obtain an aggregate.
The assembly of the photosensitive lithographic printing plate precursor A and the assembly of the dummy plate precursor are combined in Table 4 into a cassette of Luxel T-9000CTP manufactured by Fuji Photo Film Co., Ltd. equipped with an infrared semiconductor laser (830 nm). I set it.

An instruction was given from the host computer system to perform plate making. In addition, when the color sensor provided in the cassette identifies that it is a dummy plate precursor, it is transported to the next process without exposure, and is identified as a photosensitive lithographic printing plate precursor A. If it was, an instruction was given to convey the image to the next process after exposure. Thereafter, the sheet was conveyed to an automatic developing machine LP-1310H manufactured by Fuji Photo Film Co., Ltd. having the same configuration as that of the automatic developing machine shown in FIG. In this automatic developing machine, a developer having the following composition was used in the developing layer 81 and developed at a plate conveyance speed (line speed) of 2 m / min and a developer temperature of 30 ° C. Then, it washed in the water washing tank 83, processed in the gum tank 15 using the 1: 1 water dilution liquid of the finisher GN-2K made from Fuji Photo Film Co., Ltd., and dried in the heating part 15. FIG.
This plate making was carried out continuously with occasional interruptions.
In addition, since the replenishment amount of the developer in the automatic developing machine was replenished to the printing plate precursor and the dummy plate precursor, respectively, the pH of the alkaline developer remained stable.

(Developer)
The following components were dissolved in water, and the developer was adjusted with KOH so that the pH was 11.95 (25 ° C.).
Surfactant: K-1 4% by mass
-Antifoaming agent: Olfin AK-02 0.08 mass%
・ Ethylenediaminetetraacetic acid 4Na salt 0.16% by mass
・ Potassium carbonate 0.16% by mass

Thereafter, printing was performed using the obtained lithographic printing plate and dummy plate, and the occurrence of stains at that time was evaluated.
The printing stain was measured as follows. As a printing machine, Tokyo Machinery Co., Ltd. 4-color tower type rotary press CT7000 (170,000 machines), as ink, Dainippon Ink Co., Ltd. newspaper ink, as dampening water, Toyo Ink Co., Ltd. newspaper News King Alky (pH = 10.2), Oji Paper Co., Ltd. 44 g / m ² Tomakomai as printing paper, Kinyo Co., Ltd. MP-75R (2.07 mm) was used as blanket, and 100,000 copies were printed, and the stain was evaluated. .

  The plates of the combinations of Examples 1 to 6 listed in Table 4 were supplied to the CTP plate making system, and the stain resistance was evaluated for the lithographic printing plates and dummy plates obtained by the plate making process. As a result, neither the lithographic printing plate nor the dummy plate was stained at all. As a result, it became clear that stable plate-making quality can be maintained for both the lithographic printing plate and the dummy plate.

  On the other hand, when the plate of the combination of Comparative Examples 1 and 2 shown in Table 4 is supplied to the CTP plate making system, an error message appears because the photosensitive lithographic printing plate precursor A cannot be distinguished from the dummy plate precursor. The normal plate making process could not be performed.

[Examples 7 to 13, Comparative Example 3]
[Preparation of photosensitive lithographic printing plate precursor B]
(Production of support)
An aluminum plate made of material 1S having a thickness of 0.30 mm was used with a No. 8 nylon brush and an aqueous suspension of 800 mesh Pamiston, and its surface was grained and washed thoroughly with water. After etching by immersing in 10% sodium hydroxide at 70 ° C. for 60 seconds, washed with running water, neutralized and washed with 20% HNO ₃ and washed with water. This was subjected to an electrolytic surface roughening treatment in a 1% nitric acid aqueous solution with a anodic electricity quantity of 300 coulomb / dm ² using a sinusoidal alternating current under the condition of VA = 12.7V. When the surface roughness was measured, it was 0.45 μm (Ra indication).
Then, after dipping in a 30% aqueous solution of H ₂ SO _{4 and} desmutting at 55 ° C. for 2 minutes, a cathode was placed on the grained surface in an aqueous solution of 33 ° C. and 20% H ₂ SO ₄ , When anodized for 50 seconds at a current density of 5 A / dm ² , the thickness was 2.7 g / m ² .

(Formation of undercoat layer)
An undercoat layer was provided on the aluminum support thus treated by the following procedure.
First, the following undercoat layer liquid composition C was mixed and stirred at 30 ° C. After about 5 minutes, heat generation was observed, and after reacting for 60 minutes, the contents were transferred to another container, and a liquid coating solution D was prepared by adding 30,000 parts by mass of methanol.

<Liquid composition C for undercoat layer>
-50 mass parts of the following compounds-130 mass parts of methanol-20 mass parts of water-5 mass parts of paratoluenesulfonic acid-50 mass parts of tetraethoxysilane-50 mass parts of 3-methacryloxypropyltrimethoxysilane

The prepared liquid coating solution D was coated on the treated aluminum support so as to be 0.1 g / m ² and dried at 100 ° C. for 1 minute.

(Formation of photosensitive layer)
On the undercoat layer thus obtained, the photopolymerizable composition 1 having the following composition was applied so that the dry coating mass was 1.48 g / m ^2, and dried at 100 ° C. for 1 minute to form a photosensitive layer. Formed.

<Photopolymerizable composition 1>
-Ethylenically unsaturated bond-containing compound (A1: the following structure) 2.2 parts by mass-Linear organic polymer (B1: the following structure) 2.0 parts by mass-Sensitizer (C1: the following structure) 0. 15 parts by mass-photopolymerization initiator (D1: structure below) 0.25 parts by mass-sensitization aid (E1: structure below) 0.3 part by mass-ε-phthalocyanine (F1: structure below) dispersion 0.02 0.03 parts by mass (Dainippon Ink Chemical Co., Ltd.)
・ Methyl ethyl ketone 15.0 parts by mass ・ Propylene glycol monomethyl ether acetate 15.0 parts by mass

(Formation of protective layer)
On this photosensitive layer, a 6% aqueous solution of the following composition E is applied so that the dry coating mass is 2.5 g / m ² and dried at 120 ° C. for 3 minutes to form an oxygen blocking layer (protective layer). did. As a result, a photopolymerizable photosensitive lithographic printing plate precursor B was obtained.

<Composition E>
Polyvinyl alcohol 2.2 parts by mass (PVA-105, manufactured by Kuraray Co., Ltd., saponification degree 98 mol%, polymerization degree 500)
Polyvinylpyrrolidone (K30, manufactured by Wako Pure Chemical Industries, Ltd.) 0.12 parts by mass Pionein D625 (manufactured by Takemoto Yushi Co., Ltd.) 0.073 parts by mass EMALEX 710 (manufactured by Nippon Emulsion Co., Ltd., surfactant) 0 .043 parts by mass

[Interleaf]
Bleached kraft pulp was beaten, and 0.4% by mass of a synthetic sizing agent was added to a paper stock diluted to a concentration of 4%, and aluminum sulfate was added until the pH reached 5.0. This paper stock is coated with 3.0% by weight of a paper strength agent mainly composed of starch, and paper is made. The density is 0.75 g / cm ³ , the smoothness is 50 seconds, and the water content is 38 g / m ^{2 with} 6.0%. A slip sheet A was prepared.

[Evaluation]
(Evaluation of suitability of color sensor)
Whether the dummy plate precursor and the photosensitive lithographic printing plate precursor B are combined as shown in Table 5, and further, the four elements including the hitting ball and the slip sheet A can be distinguished by the color sensor. Evaluated. The color sensor was a color sensor manufactured by Keyence Corporation (sensor unit: CZ-41, amplifier unit: CZ-V1). Those that can be distinguished were marked with ◯, and those that could not be judged with x. The results are shown in Table 5.

(Evaluation of plate making aptitude using CTP plate making system)
The obtained 80 × 110 cm photosensitive lithographic printing plate precursor B and the above-mentioned interleaf paper A were alternately stacked to obtain an aggregate formed by stacking 90 plates. Similarly, the obtained 80 × 110 cm dummy original plate and the interleaving paper A were alternately stacked to obtain an integrated body formed by stacking 30 plates.
An assembly of photosensitive lithographic printing plate precursor B and an assembly of dummy plate precursors are combined as shown in Table 5, and a FD-YAG laser (532 nm) is mounted on Fuji Photo Film Co., Ltd. Luxe Plate Setter P-9600 CTP Set in NEWS cassette.

The host computer system gave instructions to process the newspaper. Further, when the color sensor provided in the cassette identifies that it is a dummy plate precursor, it is conveyed without being exposed to the next process, and is identified as a photosensitive lithographic printing plate precursor B. In such a case, an instruction was given to expose the image under the conditions of 0.2 mJ / cm ² , 909 dpi, and 100 lpi and to convey to the next process. Thereafter, each is immediately conveyed to an automatic processor FLP125NFS manufactured by Fuji Photo Film Co., Ltd. having the same configuration as the automatic processor shown in FIG. After heating, the oxygen barrier layer was washed away with water at 40 ° C. in the pre-water washing tank 12.
Thereafter, development was performed at 25 ° C. for 22 seconds using a developer DV-2: water = 1: 4 manufactured by Fuji Photo Film Co., Ltd. in the developing tank 13. Then, it washed with water in the water-washing tank 14, performed the standard process by finishing gum FP-3W: water = 1: 1 made from Fuji Photo Film Co., Ltd. in the gum tank 15, and dried with the warm air of 50 degreeC in the heating part 15. FIG. At that time, the coating amount of the gum was 150 mg / m ² in terms of dry mass.

In each tank, the replenishment conditions shown in Table 6 below are input to the automatic processor, and about 60 sheets of photosensitive lithographic printing plate precursor B are processed in about 6 hours, and about 20 sheets of dummy plate precursor are processed in about 6 hours. Processed. The power was turned on only during plate making and the others were turned off. When the power was turned on, the replenishment shown in Table 6 below was performed for the amount of time the power was off.
This plate making was carried out for 28 days with occasional interruption, and a total of about 1970 m ² of plate material was processed. The solid content concentration of the oxygen barrier layer (protective layer) of the pre-water washing tank 12 after 28 days was 2.0%, and the pH of the alkaline developer in the developing tank 13 was 12.0, the same as the new solution. The waste liquid was about 500 liters.

Thereafter, printing was performed using the obtained lithographic printing plate and dummy plate, and the occurrence of stains at that time was evaluated.
The printing stain was measured as follows. As a printing machine, Tokyo Machinery Co., Ltd. 4-color tower type rotary press CT7000 (170,000 machines), as ink, Dainippon Ink Co., Ltd. newspaper ink, as dampening water, Toyo Ink Co., Ltd. newspaper News King Alky (pH = 10.2), Oji Paper Co., Ltd. 44 g / m ² Tomakomai as printing paper, Kinyo Co., Ltd. MP-75R (2.07 mm) was used as blanket, and 100,000 copies were printed, and the stain was evaluated. .

  The plates of the combinations of Example 7 to Example 13 shown in Table 5 were supplied to the CTP plate making system, and the stain resistance was evaluated for the planographic printing plate and the dummy plate obtained by the plate making process on the 28th day. As a result, neither the lithographic printing plate nor the dummy plate was smudged at all, and the printing plate precursor was NG and the plate was not remade. Thereby, according to the plate-making method of this invention, it became clear that stable plate-making quality was maintainable with respect to both the photosensitive lithographic printing plate and the lithographic printing plate dummy plate.

  In the CTP plate making system, when the dummy plate precursor process is performed with the same liquid replenishment amount as in the printing plate precursor process, the waste liquid is increased to about 600 liters, and the pH of the alkaline developer finally becomes 12. Rose to four.

  On the other hand, when the combination plate of Comparative Example 3 described in Table 5 is supplied to the CTP plate making system, the photosensitive lithographic printing plate precursor B cannot be identified from the dummy plate precursor, and an error message is output. The normal plate making process could not be performed.

[Examples 14 to 19, Comparative Examples 4 and 5]
[Preparation of photosensitive lithographic printing plate precursor C]
(Production of support)
An aluminum plate made of material 1S having a thickness of 0.30 mm was used with a No. 8 nylon brush and an aqueous suspension of 800 mesh Pamiston, and its surface was grained and washed thoroughly with water. Etching was performed by immersing in 10% sodium hydroxide at 70 ° C. for 60 seconds, washing with running water, neutralizing with 20% HNO 3, and washing with water. This was subjected to an electrolytic surface roughening treatment in a 1% nitric acid aqueous solution with a anodic electricity quantity of 300 coulomb / dm ² using a sinusoidal alternating current under the condition of VA = 12.7V. When the surface roughness was measured, it was 0.45 μm (Ra indication).
Then, after dipping in a 30% aqueous solution of H ₂ SO _{4 and} desmutting at 55 ° C. for 2 minutes, a cathode was placed on the grained surface in an aqueous solution of 33 ° C. and 20% H ₂ SO ₄ , When anodized for 50 seconds at a current density of 5 A / dm ² , the thickness was 2.7 g / m ² .

(Formation of undercoat layer)
On the aluminum support thus treated, the following undercoat layer liquid coating solution F was applied to a concentration of 0.1 g / m ² and dried at 100 ° C. for 1 minute.

<Liquid coating liquid F for undercoat layer>
・ 2-aminoethylphosphonic acid 0.5g
・ Methanol 40g
・ Pure water 60g

(Formation of photosensitive layer)
On the undercoat layer thus obtained, a photosensitive layer coating solution having the following composition was applied so that the dry coating mass was 1.4 g / m ² and dried at 100 ° C. for 1 minute to form a photosensitive layer. .

<Synthesis of cross-linking agent [KZ-9]>
In aqueous potassium hydroxide solution, 1- [α-methyl-α- (4-hydroxyphenyl) ethyl] -4- [α, α-bis (4-hydroxyphenyl) ethyl] benzene and formalin are reacted, Sulfuric acid was added to the reaction solution for acidification and crystallization, and then recrystallization from methanol was performed to obtain a crosslinking agent (KZ-9) having the following structure. The purity measured by reverse phase HPLC was 92%.

<Acquisition of alkaline water-soluble polymer compound [BP-1]>
Poly (p-hydroxystyrene) (trade name: Marca Linker MS-4P, manufactured by Maruzen Petrochemical Co., Ltd.) was obtained and used as an alkaline water-soluble polymer compound [BP-1].

(Coating solution for photosensitive layer)
・ Alkali water-soluble polymer compound (BP-1) 1.40 g
・ Acid generator (SH-01) 0.20g
・ Crosslinking agent (KZ-9) 0.60g
・ Infrared absorbing dye (IK-1) 0.20g
・ Victoria Blue 1-Naphthalenesulfonate 0.04g
・ Fluorine-based surfactant 0.01g
(Megafuck F-176, manufactured by Dainippon Ink & Chemicals, Inc.)
・ Methyl ethyl ketone 3.00 g
・ Methanol 16.0g
1-methoxy-2-propanol 8.0g

  The structures of the acid generator (SH-01) and the infrared absorbing dye (IK-1) are shown below.

[Interleaf]
Bleached kraft pulp was beaten, and 0.4% by mass of a synthetic sizing agent was added to a paper stock diluted to a concentration of 4%, and aluminum sulfate was added until the pH reached 5.0. This paper stock is coated with 3.0% by weight of a paper strength agent mainly composed of starch, and paper is made. The density is 0.75 g / cm ³ , the smoothness is 50 seconds, and the water content is 38 g / m ^{2 with} 6.0%. Interleaf paper B was prepared.

[Evaluation]
(Evaluation of suitability of color sensor)
Whether the dummy plate precursor and the photosensitive lithographic printing plate precursor C are combined as shown in Table 7, and further, the four elements including the hitting ball and the interleaving paper B can be distinguished by the color sensor. Evaluated. The color sensor was a color sensor manufactured by Keyence Corporation (sensor unit: CZ-41, amplifier unit: CZ-V1). Those that can be distinguished were marked with ◯, and those that could not be judged with x. The results are shown in Table 7.

(Evaluation of plate making aptitude using CTP plate making system)
The obtained 80 × 110 cm photosensitive lithographic printing plate precursor C and the above-mentioned interleaf paper B were alternately stacked to obtain an integrated body in which 50 plates were stacked. Similarly, the obtained 80 × 110 cm dummy original plate and the above-mentioned interleaf paper B were alternately stacked to obtain an integrated body in which 30 plates were stacked.
The assembly of the photosensitive lithographic printing plate precursor C and the assembly of the dummy plate precursor are combined in Table 7 into a cassette of Luxel T-9000CTP manufactured by Fuji Photo Film Co., Ltd. equipped with an infrared semiconductor laser (830 nm). I set it.

The host computer system gave instructions to process the newspaper. Further, when the color sensor provided in the cassette identifies that it is a dummy plate precursor, it is conveyed without being exposed to the next process, and is identified as a photosensitive lithographic printing plate precursor C. In this case, an instruction was given to expose the image under the conditions of 133 mJ / cm ² , 909 dpi, and 100 lpi and to convey to the next process. Thereafter, using a warm air heating device (Oven manufactured by Wisconsin), after heat treatment at 145 ° C. for 75 seconds, an automatic processor LP manufactured by Fuji Photo Film Co., Ltd. having the same configuration as the automatic processor shown in FIG. -1310H. In this automatic developing machine, the developing layer 81 was developed at 30 ° C. for 12 seconds using a developer DT-N: water = 1: 8 manufactured by Fuji Photo Film Co., Ltd. Then, it washed with water in the water-washing tank 83, performed the standard process by finishing gum FP-2W: water = 1: 1 made from Fuji Photo Film Co., Ltd. in the gum tank 15, and dried with the warm air of 50 degreeC in the heating part 15. FIG. At that time, the coating amount of the gum was 150 mg / m ² in terms of dry mass.

For the dummy plate, the conveyance speed condition (1) shown in Table II in Table 1 is input to the conveyance means of the automatic developing machine, the printing plate precursor is processed in 75 minutes, and the discard plate precursor is 30 sheets in 10 minutes. Min for a total of 85 minutes.
This plate making was carried out for 28 days with occasional interruption, and a total of about 1970 m ² of plate material was processed. The pH of the developed layer 81 after 28 days was 13.0, the same as the new solution. The waste liquid was about 500 liters.

Thereafter, printing was performed using the obtained lithographic printing plate and dummy plate, and the occurrence of stains at that time was evaluated.
The printing stain was measured as follows. As a printing machine, Tokyo Machinery Co., Ltd. 4-color tower type rotary press CT7000 (170,000 machines), as ink, Dainippon Ink Co., Ltd. newspaper ink, as dampening water, Toyo Ink Co., Ltd. newspaper News King Alky (pH = 10.2), Oji Paper Co., Ltd. 44 g / m ² Tomakomai as printing paper, Kinyo Co., Ltd. MP-75R (2.07 mm) was used as blanket, and 100,000 copies were printed, and the stain was evaluated. .

  The plates of the combinations of Example 7 to Example 13 shown in Table 7 were supplied to the CTP plate making system, and the stain resistance was evaluated for the planographic printing plates and dummy plates obtained by the plate making process on the 28th day. As a result, neither the lithographic printing plate nor the dummy plate was smudged at all, and the printing plate precursor was NG and the plate was not remade.

  In the CTP plate making system, the processing time was 120 minutes in total when the dummy plate precursor processing was performed at the transport speed shown in Table 1 of Table 1 as in the printing plate precursor processing. Thereby, according to the plate making method of this invention, it became clear that the shortening effect of plate making processing time was acquired.

  On the other hand, when the plate of the combination of Comparative Examples 4 and 5 shown in Table 7 is supplied to the CTP plate making system, an error message appears because the photosensitive lithographic printing plate precursor C cannot be distinguished from the dummy plate precursor. The normal plate making process could not be performed.

  In the present invention, for the purpose of shortening the plate making processing time, when processing the discarded plate precursor, the exposure processing in the plate setter 10 is omitted, the transport speed in the heating oven 40 is increased, and the transport in the automatic processor 60 is performed. Although the speed has been increased, the plate making method and plate making apparatus adopting only one of these measures can achieve the effect of shortening the processing time and achieving the object of the present invention. Can do.

1 is a perspective view showing a schematic configuration of an embodiment of a CTP plate making system according to the present invention. It is a longitudinal cross-sectional view which shows schematic structure of the heating oven in the CTP plate making system shown in FIG. It is a longitudinal cross-sectional view which shows schematic structure of the automatic processor (without pre-water washing) of a CTP plate making system. It is a longitudinal cross-sectional view which shows schematic structure of the automatic processor (with pre-washing) of a CTP plate making system. It is the block diagram which showed roughly the flow of the process of the CTP plate making system shown in FIG. It is a flowchart for demonstrating the process sequence of the CTP plate making system shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plate setter 11 Heating part 12 Pre-washing tank 13 Developing tank 14 Washing tank 15 Gum tank 16 Drying part 40 Heating oven 46 Conveying means 48 Motor drive part 51 Control part 1,60 Automatic developing machine 61 Developing part 63 Washing part 65 Finisher part 67 Drying Unit 68 Sensor 72 Conveying Means 76 Conveying Roller 78 Motor Drive Unit 80 Control Unit 91 Drying Means 95 Control Device 100 CTP Plate Making System

Claims (5)

A photosensitive lithographic printing plate precursor and a lithographic printing plate precursor are made using a CTP plate making system including an exposure processing unit that performs exposure processing by laser light irradiation and a development processing unit that performs development processing in this order. Engraving method,
The lithographic printing plate precursor has an absorption maximum having an absorbance X of 0.20 or more in the region of 350 to 800 nm, and the absorbance Y and the absorbance X at the wavelength indicating the absorption maximum of the photosensitive lithographic printing plate precursor. The plate making method is characterized in that the difference from the above is ± 0.10 or more.   The photosensitive lithographic printing plate precursor is identified from the lithographic printing plate precursor, and the amount of developer replenishment in the development processing unit is set to be greater than when processing the photosensitive lithographic printing plate precursor. 2. The plate making method according to claim 1, wherein the plate is controlled so as to be reduced when the original plate is processed.   The photosensitive lithographic printing plate precursor is discriminated from the lithographic printing dummy plate precursor, and when the lithographic printing dummy plate precursor is a lithographic printing dummy plate precursor, the photosensitive lithographic printing plate precursor is transported to a development processing section without performing an exposure process. The plate making method according to claim 1 or 2.   The plate making method according to any one of claims 1 to 3, wherein the CTP plate making system includes a heat treatment unit between the exposure processing unit and the development processing unit. The photosensitive lithographic printing plate precursor has a photosensitive layer coating amount of 1.0 g / m ² or more, and the lithographic dummy plate precursor has a protective layer coating amount of 1.0 g / m ² or less. The plate making method according to any one of claims 1 to 4.

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