JPS6225760A - Processing system for photoengraving of lithographic printing plate - Google Patents

Abstract

PURPOSE:To simultaneously subject a composite PS plate and another PS plate to a developing process by providing a unit part for inserting a photosensitive lithographic printing plate between the 1st developing part for image forming and the 2nd developing for resist image forming. CONSTITUTION:The composite PS plate constituted by providing a silver iodobromide emulsion layer, etc. on a positive type photosensitive PS plate is fed to the 1st developing part 101 where a developing soln. is passed from a nozzle 8 to develop said plate. The plate is then fixed in a fixing part 103 and the silver image of a silver halide photosensitive layer is exposed in a UV exposing part 104. The image is exposed and transferred to a positive type photosensitive resin. The silver image and gelatin film are then removed in a film dissolving part 105. The plate is inspected in a unit part 106 and is fed to the 2nd developing part 102 where the developing soln. is passed from a nozzle 29 to develop the plate and to form the resist image. An insertion part 39 is provided to the unit part 106 and the positive type photosensitive PS plate is inserted therein and is developed by the 2nd developing part 102, by which the resist image is formed. Since the unit part 106 is provided, the developing process of the composite type lithographic printing plate and PS plate is executed with one process machine.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides the following features:
This relates to a plate-making processing system that can make two or more types of lithographic printing plates, and also enables auxiliary processing such as plate inspection and correction of printing plates during plate-making processing, as necessary, so that a variety of plate-making processing operations can be performed simultaneously. The present invention relates to a prepress processing system that is devised so that processing can be performed in one prepress processing system line, and as a result, the prepress processing cost can be reduced.

(Description of Prior Art) Conventionally, a lithographic printing plate (PS plate pre
For example, by devising a first development process using a positive developer and then a second development process using a negative developer, both negative PS plates and positive PS plates can be made common. There are also known plate-making methods that allow printing to pass through. There are also known developing machines that are designed to be able to insert 28 plates into the first developing section.
! Ya special request! 9-70222. Both the first development process and the second development process have the function of eluting non-image areas, as has been known in the past, and conventionally, they do not essentially improve the defects that each development has. do not have. On the other hand, a composite 28 plate is known, which has a hybrid function by combining a plurality of elements each having unique features in order to have high sensitivity, high image quality, and excellent printability. These are, for example, JP-A-3J-/4444tj.
,! ! -/Gu9ha bow, j6-7gu39, British patent/
Ko, 27gθ3, US patent 3jbu 741g! , same j,
24tj 7? j, Buddhist painting 20.2.20r/, 0L
It is described in S-244t0763 etc. Moreover, the plate-making method is also described in, for example, Japanese Patent Application Laid-Open No. 4-111. 2j7J? , Tokugansho!
? -//441/, etc.

Today, in parallel with the progress of automation, especially robotization, in the plate-making process, devices are being developed to allow the 28 plates coming from another line to be relatively arbitrarily inserted into the intermediate process of a series of lines, or to inspect and correct plates relatively arbitrarily in the intermediate process. In addition, there has been a demand for innovations that include a function that allows process quality inspection.

(Object of the Invention) The first object of the present invention is to enable easy acceptance inspection and correction of formed images in a highly devised composite 28-plate plate-making processing system. The second purpose is to enable this combined 28-plate plate-making system to develop another 28 plates. The third objective is to provide a liquid replenishment management system that can process two or more types of 28 plates, and furthermore to provide a plate-making processing system that can reduce plate-making processing costs.

The above objects of the present invention are as follows: (1) In a plate making processing system for a lithographic printing plate comprising a first developing section for forming a IIIj image and a second developing section for forming a lithographic printing resist image, the first developing section An accumulation unit section provided with a second insertion section for inserting a photosensitive lithographic printing plate between the first development section and the second development section, and provided on the upstream side of the first development section. From the first insertion section,
A @/ photosensitive planographic printing plate having an image forming layer and a resist image forming layer is inserted, a second photosensitive planographic printing plate having a resist image forming layer is inserted from the second insertion portion, and the The first photosensitive lithographic printing plate was processed by successively passing through a first developing section and a second developing section, and the second photosensitive lithographic printing plate was processed through a second developing section. Plate making processing system for lithographic printing plates.

(2) In the description of item 1 above, the first photosensitive lithographic printing plate comprises a non-silver salt oleophilic resist image forming layer and an image forming layer containing silver halide particles on the support in this order. Plate-making processing system 0 for a lithographic printing plate, characterized in that it is a lithographic printing plate formed by coating (3) In the description of item 1 above, the first photosensitive lithographic printing plate is formed on a support (=, non-coating). 1. A lithographic printing plate processing system, characterized in that the lithographic printing plate is formed by coating a silver salt oleophilic resist image forming layer and a photosemiconductor photosensitive image forming layer in this order.

(4) Lithographic printing as described in item 1 above, characterized in that the second photosensitive lithographic printing plate is a lithographic printing plate comprising a non-silver salt oleophilic resist image forming layer provided on a support. Plate making processing system.

(5) The lithographic printing plate according to item 1 above, characterized in that the first sensor is provided near the first insertion section, and the second sensor is provided near the second insertion section. Prepress processing system.

achieved by.

Next, the present invention will be explained in detail. The first photosensitive planographic printing plate used in the present invention is a composite planographic printing plate having at least two layers separated into an image forming layer and a resist image forming layer. The image forming layer is preferably a photosensitive layer containing photosensitive silver halide grains, and is developed using commonly known developing methods such as JP-A-Sho! Buichi 2!73ri, Tokukai Shoj, g-///♂
j2, Ya Tokugansho! It is a layer that can form an image by the method described in Patent//l/s//, and may also be a photosensitive layer containing an organic or inorganic photosemiconductor.
In this case, a normal electrophotographic toner development method, such as JP-A-7-4TJ! It may be one that can form an image by the method described in No. 67 or the like. In addition, about 10% of PS plates using ordinary diazo resin containing photopolymerizable monomers, resins, photocrosslinkable photopolymers, photodegradable polymers, etc.
It may be an image forming layer that can form an image with twice or more high sensitivity.

As the resist image forming layer used in the present invention, a photosensitive layer used in a normal PS plate, such as that described in JP-A-Sho, -1-/44≦4tj, is used. In particular, the O-
A photosensitive layer made of a composition made of a quinonediazide compound or a photosensitive azide compound, a composition made of a polymer compound containing -CH=CI (-C- group) in the main chain or side chain of the polymer, an addition polymerizable inorganic compound, etc. A photosensitive layer made of a photopolymerizable composition comprising a saturated compound and a photopolymerization initiator can be used.The PS plate used in the present invention can be obtained by providing an image forming layer on this photosensitive layer. I can do it.

The support used in the present invention has a hydrophilic surface and is preferably an aluminum support provided with an alumite layer by anodizing. For example, U.S. Patent No. 30311jO, 34t7/37! , Special Public Sho 4T Co-74130, Special Public Sho YJ-7Jr4T2 and Special Public Sho 4T
? -10 The method described in Gotako 7 etc. is used. In particular, there may be no alumite layer, but preferably there is no alumite layer.
．． /g/m2 preferably 0. It is preferable to provide an alumite layer with a thickness of 100 g/m2 or more.

Separately, the photosensitive lithographic printing plate having a resist image forming layer used in the present invention may be a normal PS plate, and preferably a composition comprising an 0-quinonediazide compound or a photosensitive azide compound is coated on a support. It may be a PS plate provided with a support, preferably a PS plate provided with a composition equivalent to or similar to the resist image forming layer of the composite lithographic printing plate used in the present invention on a support.

The first developing section in the present invention is a developing section for forming an image of a composite type 28 plate, and can also be used for developing a film or photographic paper used as a printing plate. When forming an image using an electrophotographic method, for example, Japanese Patent Application Laid-Open No. 7-41. The toner development method described in tjj7 etc. is used. The second developing section in the present invention is a developing section for forming a resist image, and can be developed using a rice developer using a normal PS plate. For example, the developing method shown in Japanese Patent Publication No. 4T4T-2724 and Japanese Patent Publication No. 4T4T-2724 and No. 11 Publication No. 4T6-Kotsujλ/ can be used.

Seven preferred aspects of the present invention include a second insertion opening into which a second photosensitive lithographic printing plate (PS plate) provided with a resist image forming layer can be inserted between the first development section and the second development section. A unit section having the following structure is provided, and a conveying means such as a belt conveyor is provided inside this unit section. This conveyance means preferably moves at a speed substantially equal to or faster than the feed line speed of the first or second photosensitive planographic printing plate in the first developing section or the second developing section. Further, it is preferable that this unit section is provided with a second sensor different from the first sensor provided near the insertion section of the first developing section.

The second sensor maintains functions such as detecting a printing plate, detecting and inputting area information, and managing replenishment of processing liquid in the second developing section.

The first sensor has the functions of detecting a lithographic printing plate inserted into the first developing section, inputting area information, and managing the replenishment of processing liquid in the first developing section and/or the second developing section. As these first and second sensors, sensors capable of detecting transmittance, reflectance, electrical resistance, capacitance, etc. can be used. As a result, the composite lithographic printing plate or printing plate film according to the present invention or -"S-, e-
Development processing for image formation and development processing for 28 plates according to the present invention can be performed by one automatic plate making machine.

It is possible to provide an automatic line that is advantageous for automatic systemization of plate making and eventually robotization of plate making.

In addition to these first and second sensors,
As described in No. 4t9, seven or more sensors may be provided in the processing line for detecting the degree of elution of the photosensitive planographic printing plate and determining the amount of replenishment of the processing solution.

Examples of the present invention will be shown below. However, it is not limited to this.

Example 1 A JS material aluminum plate mechanically grained by the method of JP-A-4-33-77 was immersed for 7 minutes in a portion of a sodium hydroxide aqueous solution maintained at a temperature of θ0C. Some parts were corroded. After washing with water, it was immersed in a sulfuric acid-chromic acid solution for about a minute to expose the pure aluminum surface. It was kept at 30°C. Immersed in 20% sulfuric acid, current voltage/,! (2) After anodizing for 2 minutes at a current density of 3 A/dm2, it was washed with water and dried. Next, a photosensitive solution having the following composition was continuously coated using an extrusion type Giesser so that the dry weight was about 2 g/m<2>.

Acetone-pyrogallol resin naphthoquinone-/,-diazide (2)-j-ester sulfonate (synthesis method is according to the method of US Patent No. 3゜≦3j, Example 709)..., 2.7 g Cresol formaldehyde resin...j, 0g Methyl ethyl ketone...7jg Cyclohexanone...60g This positive type photosensitive 28
Let the version be PS version A.

Separately, a silver iodobromide emulsion was prepared as follows.

! A silver nitrate aqueous solution and a potassium bromide aqueous solution were simultaneously added to an aqueous gelatin solution maintained at θ0C with stirring for 10 minutes, and the pAg was controlled at 7.9 during that time to obtain a silver bromide emulsion with an average grain size of 0.2 jμ. After removing soluble salts by a conventional method, this emulsion was prepared with 4
Add tj m g of sodium thiosulfate and ≦o 'C
Chemical ripening was performed for 6θ minutes. Then 0. A silver iodobromide emulsion was obtained by adding potassium iodide in an amount equivalent to <1 mole.

4 ttg of phenol formaldehyde resin MP/-θHH (manufactured by Gunei Chemical Industry ■) was dissolved in a mixture of 330 g of ethyl acetate and 720 g of methyl ethyl ketone, and 10 g of gelatin was added.
An emulsion prepared by dispersing a solution of a mixture of sodium nonyl(benzenesulfonate/θ) solution and /jOml of a 10% funnel oil solution in 10θml of aqueous solution.
.../3θOg/, 3-diethyl! −〔
-1(3-(3-sulfopropyl)penzoxazole-coylidene)ethylidenecothiohydantoin sodium salt. /% methanol iW? f...100m1 Derhydroxy-bu-methyl/, J, ja.

? -0.6% alkaline aqueous solution of tetrazaindene
...-00 ml of glyoxal in aqueous solution...
The finished emulsion obtained by adding each of the two was coated onto the photosensitive layer of PSyJiA so that the dry weight was 4 tg/m2, and dried with hot air at a final temperature of 710°C. Printing plate B was obtained.

Next, FIG. 1 shows a schematic diagram of an example of a plate-making processing system for carrying out the present invention, which can process two or more types of 28 plates, the ultra-high-sensitivity lithographic printing plate B and the positive 28 plate A.

According to the present invention, the ultra-high sensitivity composite lithographic printing plate B is inserted from the composite printing plate supply port after image exposure and is sensed by the first sensor for plate detection and growth detection, and the plate conveyance drive motor is started. Then, it is transported to the first developing section /θ/ in the direction of the arrow by a pair of insertion rollers 3, transport rollers 7, and the like.

A nozzle pipe t is installed above the conveyance path, and developer (1), which will be described later, stored in the tank lid is pumped through the nozzle pipe by pump/θ. The developer CI is supplied to the surface of the silver halide photosensitive layer of composite printing plate B from the nozzle.
) is jetted and developed, and the developer (1) is squeezed out by a pair of squeezing roller saws. The composite planographic printing plate B that has passed through the first developing section 10/ in this way is transferred to a pair of feeding rollers 73.
The image is sent to the fixing unit 103 by.

In the fixing section /θ3, in the same way as the first developing section 10/, a fixing solution, which will be described later, is sent from the tank /j to the nozzle Ib'/4t by the pump /B and is injected onto the surface of the silver halide photosensitive layer of the composite planographic printing plate B. and remove undeveloped silver halide. The composite planographic printing plate B from which the fixer has been squeezed out by the aperture roller /7 is then sent to the UV exposure section /θg, where the entire surface is exposed to UV light from a mercury lamp, forming a silver halide photosensitive layer. The silver image is exposed and transferred to the positive photosensitive resin layer. Next, the leached part /θj is
The hot water at θ0C is pumped from the tank 22 to the pump 3.
The silver halide photosensitive layer is sent to the nozzle pipe 20 and sprayed onto the surface of the silver halide photosensitive layer of the composite lithographic printing plate B. The surface of the silver halide photosensitive layer is further rubbed by the brush roller 24t, and the silver image and gelatin film after fixing are leached and removed. be done.

Next, the composite planographic printing plate B is sent to the unit department IOT,
Belt conveyor 2! transported by.

At this time, if necessary, if there are plate inspections or unnecessary images,
Only unnecessary image parts are removed by a method such as additional exposure.

Before the printing plate B conveyed by the belt conveyor enters the second developing section/θ, it is sensed by the second developing section λ sensor 27 for plate detection and growth detection, and is sent to the second developing section 102. .

In the second developing section 70, a developer (I), which will be described later, is supplied from the tank 32.
I) is sent to the nozzle pipe λ by the pump 33, subjected to transfer exposure with UV light from the composite printing plate B, and then sprayed onto the exposed surface of the positive photosensitive resin layer. is rubbed to remove the exposed portion of the positive photosensitive resin layer and form a resist image. Next, the developer <II) is squeezed out by the squeezing roller 3 da and sent to the finisher part 107 .

In the finisher part 107, water from the tank 36 is filled with finisher gum liquid FP manufactured by Fuji Photo Film (/:/
) is applied to the nozzle spray 3 by the pump 37.
/, and is sprayed onto the surface of the plate B after development.

In this way, a printing plate obtained by subjecting composite printing plate B to plate-making processing according to the present invention using the plate-making processing system shown in FIG. 1 is obtained.

Composition of developer (1) Water...2
θθm! Metol...3.
0g sodium sulfite...4t! ,0
gHydroquinone.../2.0g
Sodium carbonate (/water salt): 10.0g Potassium bromide: 2g Add water to make a volume of 1/l. This stock solution is diluted with water (/:J) and used.

Developer (II) JISI sodium silicate...ioog sodium metasilicate...! θg pure water
.../rθθml fixer (1
) Water...7
θQml ammonium thiosulfate...22
4tg sodium sulfite...-0
g Water was added to give .../θooml. On the other hand, the positive photosensitive PS plate A is shown in FIG. 1 after image exposure.

The sheet is inserted onto the belt conveyor from the insertion section 3 provided at the upper part of the unit section 106 of the plate making processing system according to the present invention, is sensed by the plate detection and growth detection sensor core, and is conveyed to the second developing section 102.

Thereafter, it is treated in exactly the same manner as the positive photosensitive resin layer of composite planographic printing plate B. In this way, positive type photosensitive PS plate A
A printing plate obtained by performing plate-making processing using the plate-making processing system according to the present invention is designated as a.

The transport speed of this plate-making processing system was set so that the development time for both the first development section and the λ-th development section was 2θ seconds.

The image-exposed PS plate A and composite printing plate B of /θθθmrnx/θθmm are indiscriminately passed through the above-mentioned plate-making processing system, and the growth of composite printing plate B is detected by the growth detection sensor 2 and three metering pumps are applied. /θ seconds, and now 1
The liquid (1) is placed in the tank 9 of the first developing section /θ/, the fixer is placed in the tank /j of the fixing section 3, and the water is placed in the solution film section /θ! tank 2
Subsequently, growth was detected by the sensor 22 and the metering pump was operated for 7θ seconds to replenish the developer (II) into the tank 3.2 of the second developing section 102.

In PS plate A, growth is detected by the second sensor = 7, the metering pump is operated for /θ seconds, and the developing solution (
II) was supplemented.

With this processing method, the first developing section, fixing section, and solution film section are
m2/l, and the second developing section was able to process up to 70 m2/l. When I printed using printing plates a and b that had been developed in this way, both printing plates started printing! It was possible to obtain 100,000 prints with no stains in the non-image areas.

Example! After dispersing for a minute, apply with a wire parr,
It was dried at 700C for 7 minutes.

■Yellow Nororac type phenolic resin 33 parts by weight in isopropyl alcohol 72 parts by weight ÷ Ethyl acrylate methyl methacrylate - Methyl acrylate in 10 ethyl alcohol 2j% by weight Phthalocyanine pigment (Sumikabrint GN-0) / parts by weight Toluene 2j by weight The solid content coating weight of the optical semiconductor layer is (g/m2).

This composite electrophotographic printing plate is referred to as printing plate C.

FIG. 2 shows a schematic diagram of an example of a second plate-making processing system, which is capable of processing two or more types of 28 plates, the electrophotographic printing plate C and the positive 28 plate A, and which implements the present invention.

The printing plate C is placed in the first plate provided in the plate feeding section O/ shown in FIG.
Insertion part! 3 to the exposure section θ, positive corona charging was performed using a corona charger set to a corona charging voltage + tooov, and then irradiation light of 30 lux from a tungsten bulb was exposed for 3 seconds through the positive transparent original. .

Then, it was sent to the first developing section 203 and was immersed in a liquid developer (Ricoh HMRP-t/θ) containing negative polarity toner for 2θ seconds to perform toner development.

A first sensor is disposed near the first insertion portion S3, and this first sensor detects the insertion of the first photosensitive planographic printing plate and also provides area information of the photosensitive planographic printing plate. This information is used as information for replenishing the processing liquid in the first developing section or the fourth developing section.

Next, the toner was transported to a drying section θ9 and dried with air to obtain a positive toner image. Next, the second exposure section! mercury lamp 64
The entire surface was exposed at t, and the toner image was transferred to a positive type photosensitive resin layer, and then sent to the unit section 6.

After checking and correcting the plate as necessary, 〈Route Conveyor, 2!
, and is sensed by the second developing section plate detection and growth detection sensor 2 and sent to the second developing section 102 .

The system configuration from the second developing section onwards was the same as that shown in Example-/. As the second developer and the finisher gum solution, the developer (IF) shown in Example-/ and the finisher gum solution FP manufactured by Fuji Photo Film@ were used.

The printing plate obtained by the plate-making process in this manner is referred to as printing plate C.

On the other hand, the positive type PS plate A could be made into a plate in exactly the same manner as shown in Example 2 by inserting it from the insertion part 39 of the unit part B using the plate making processing system shown in FIG. This printing plate is referred to as printing plate a'.

When I printed using printing plate C and printing plate a', both printing plates started printing! It was possible to obtain 100,000 prints with no stains in the non-image areas.

(Effects of the Invention) According to the present invention, two or more types of lithographic printing plates can be processed in seven plate-making processing system lines, and processes such as acceptance inspection and correction of printing plates during plate-making processing are also performed in the plate-making processing line. This makes it possible to significantly reduce the cost of plate-making processing.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a prepress processing system shown in Example 1 of the present invention, and FIG. 2 is a schematic diagram of a prepress processing system shown in Example 2 of the present invention. 10/...First developing section 102...Second developing section 103...Fixing section 104t...Uv@light section/θ! ...Metal film part 106...Unit part 102...Part of finisher...First sensor 27...First sensor/...First insertion part 3W...Second insertion part 3, /j, /9, 2F, 3j ... Insertion roller /,
2. /7. Ko/, 3g, 3ta...Aperture roller! ,
/4t, KoO, Kota, 3?・・・Spray pipe／／・
...Mercury lamp 4t130 ... Brush roller 21 ... Belt conveyor - /θl/Otsu, , IJ, ,! j, 37...Processing liquid feeding pump-θ/...Plate feeding section-02...Charging exposure section 03...First developing section, 204t...Drying section θ! ...Second exposure section jr...first sensor! Ko...Insert roller! Gu,! ! , ,tJ, j7, jr,
j9, buθ,≦/,62. tj...Conveyance roller U...Mercury lamp 6...Exposure means

Claims (5)

[Claims] (1) In a lithographic printing plate making processing system consisting of a first developing section for image formation and a second developing section for forming a lithographic printing resist image, the space between the first developing section and the second developing section a second plate for inserting a photosensitive lithographic printing plate into the
A first photosensitive lithographic printing plate having an image forming layer and a resist image forming layer is inserted from the first inserting part provided upstream of the first developing section. A second photosensitive lithographic printing plate having a resist image forming layer is inserted from the second insertion portion, and the first photosensitive lithographic printing plate has a first development section and a second development section. A plate making processing system for a lithographic printing plate, wherein the second photosensitive lithographic printing plate is processed through the second developing section. (2) In the description of item 1 above, the first photosensitive lithographic printing plate comprises a non-silver salt oleophilic resist image forming layer and an image forming layer containing silver halide particles on the support in this order. A plate-making processing system for a lithographic printing plate, characterized in that the lithographic printing plate is a coated lithographic printing plate. (3) In the description of item 1 above, the first photosensitive lithographic printing plate comprises a non-silver salt oleophilic resist image forming layer and a photosemiconductor photosensitive image forming layer coated on the support in this order. A lithographic printing plate processing system characterized by being a lithographic printing plate. (4) A lithographic printing plate according to item 1, wherein the second photosensitive lithographic printing plate is a lithographic printing plate comprising a non-silver salt oleophilic resist image forming layer on a support. plate-making processing system. (5) The lithographic printing plate according to item 1 above, characterized in that the first sensor is provided near the first insertion section, and the second sensor is provided near the second insertion section. Prepress processing system.