JPS6258253A - Processing method for photosensitive lithographic plate - Google Patents

Abstract

PURPOSE:To prevent wasteful use of water, by processing a photosensitive lithographic plate with an aqueous solution containing a surface active agent immediately after the plate is developed by using the same developing solution which is repeatedly used. CONSTITUTION:A developing section is composed principally of a developing tank 1, carrying rollers 3, a brush roller 4, solution supplying nozzles 8, squeezing rollers 5, tandem roller pairs 6, receiving rollers 7, developing solution storing tank 10, and developing solution supplying pump 9 and, at the time of development, the pump 9 is actuated and a developing solution is supplied to a photosensitive lithographic plate from the nozzles 8. The used developing solution is squeezed by the rollers 5 and returned to the tank 10. Thus the solution is circularly used. A surface active agent solution processing section is composed principally of a surface active agent solution processing tank 2, carrying rollers 3', tandem roller pairs 6', squeezing rollers 5', and solution supplying nozzles 8' and supplies a surface active agent solution which is circularly used by means of a pump 11 to the lithographic plate coming out from the developing section through the nozzles 8'.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for processing a photosensitive lithographic printing plate, and more specifically, a method for processing a photosensitive lithographic printing plate in which a washing step after development is omitted. It is related to.

[Conventional technology]

Exposed photosensitive lithographic printing plate (hereinafter simply referred to as 25th plate)
When processing a large number of sheets, it is common to use an automatic processor, but when processing negative 15th plates and positive 18th plates in common with one automatic processor, 25 sheets are processed.
The developer had to be replaced each time depending on the type of plate, which was inefficient and economically wasteful.

JP-A-192952 discloses a method in which a negative type and a positive type 18 plate are processed with the same developer, but in this case, after development, a large amount of washing water is used to perform washing with running water. In this case, there are disadvantages such as increased costs due to the use of a large amount of water and environmental pollution caused by washing waste water.

In addition, the method W simply eliminates the water washing process after developing the 25th plate.
WABB54-8002 public 11, Wfj) I 1977-
This method is described in Japanese Patent No. 115045, but in order to process negative and positive 25 plates using the same automatic developing machine, it is necessary to change the developer depending on the type of 25 plate as described above. , the ability to avoid a decline in work efficiency and economic efficiency = song.

Furthermore, JP-A-57-158643, JP-A No. 59-5843
No. 1 and No. 59-57242, etc., describe a method of repeatedly using washing water, but although this also improves the problem of wastewater and water resources, 18
The problem of developer exchange between plates remained unsolved.

[Problem to be solved by the invention 1 As mentioned above, although many methods have been proposed regarding the treatment method of 18th edition that does not waste water, there is still no satisfactory method. No method has been developed that can commonly process 18 negative and positive plates without consuming them.

An object of the present invention is to improve the above-mentioned drawbacks of the prior art and to provide a novel 18-plate processing method in which 28 negative plates and 28 positive plates can be processed in a common process without changing the liquid.

Another object of the present invention is to provide a simple method for processing the 18th printing plate, in which both the negative mold and the positive 28th printing plate are processed, and there is no need for washing with water.

Still another object of the present invention is to provide a method for processing 18th plates at a low processing cost, which allows mixed processing of negative type and bottom type 28th plates.

Measures to Solve Problem E 11] As a result of intensive research, the inventors of the present invention have found that the above-mentioned purpose is to produce negative-type photosensitive lithographic printing plates and /* or positive-type photosensitive In a processing method in which lithographic printing plates are automatically conveyed and developed, a negative and/or positive photosensitive lithographic printing plate is under-developed with the same developing solution that is used repeatedly, and then immediately subjected to surface active treatment. It has been found that this can be achieved by a method of processing a photosensitive lithographic printing plate, which is characterized by processing with an aqueous solution containing an agent.

The present invention will be explained in detail below.

The 18th plate targeted by the present invention is one in which a photosensitive layer whose solubility changes upon irradiation with light is coated on a support, or a soluble layer in which an image resist layer can be formed by electrophotography or the like. It is provided on a support.

Supports used for the 18th edition include paper, plastics (e.g. polyethylene, polypropylene, polystyrene, etc.), laminated paper, aluminum (including aluminum alloys), metal plates such as zinc, copper, etc. Films of plastics such as acid cellulose, bipartite cellulose, cellulose propionate, polyethylene terephthalate, polyethylene polypropylene, polycarbonate, polyvinyl acetal, etc., paper or plastic films laminated or vapor-deposited with metals such as those mentioned above, aluminum or chrome plating. Among these, especially,
Aluminum and aluminum-coated composite supports are preferred.

Further, the surface of the aluminum material is preferably roughened for the purpose of increasing water retention and improving adhesion with the photosensitive layer.

Examples of the surface roughening method include generally known methods such as brush polishing, ball polishing, electrolytic etching, chemical etching, liquid honing, and sandblasting, and combinations thereof, and preferred methods include brush polishing, electrolytic etching, and chemical etching. These include target etching and liquid honing.
Among these, surface roughening methods involving the use of electrolytic etching are particularly preferred.

In addition, the electrolytic bath used in electrolytic etching is an aqueous solution containing acids, alkalis, or their salts, or an aqueous solution containing an organic solvent. Liquid is preferred.

Further, the roughened aluminum plate is desmutted with an acid or alkali aqueous solution, if necessary.

It is desirable that the aluminum plate thus obtained is subjected to an anodizing treatment, particularly preferably a method of treatment with a solution containing sulfuric acid or phosphoric acid.

Furthermore, if necessary, surface treatment such as pore sealing treatment and immersion in an aqueous solution of potassium zirconate can be performed.

The 18th edition photosensitive composition used in the present invention contains a photosensitive substance as an essential component, and the physical and chemical properties of the photosensitive substance do not change upon exposure or subsequent development treatment. For example, there are differences in solubility in developing solutions due to exposure, differences in intermolecular adhesive strength before and after exposure, differences in affinity for water and oil due to exposure or subsequent development, and Those that can be used to form image areas using electrophotography are no longer used.

Typical photosensitive substances include, for example, photosensitive diazo compounds, photosensitive azide compounds, compounds with ethylenically unsaturated double bonds, epoxy compounds that polymerize with acid catalysts, and C-〇- that decomposes with acids. Examples include compounds having a C-group.

Examples of photosensitive diazo compounds include 0-quinonediazide compounds, which are positive types that change to alkali solubility when exposed to light, and aromatic noazonium salts, which are negative types whose solubility decreases when exposed to light.

Specific examples of 0-quinonediazide compounds include, for example, JP-A-47-5303, JP-A-4B-63802, and JP-A-48.
-838 (L1.

No. 49-38701, No. 56-1044, No. 56-
No. 1045, Special Publication No. 41-11222, No. 43-28
No. 403, No. 45-9610, No. 49-17481, U.S. Patent No. 2,797.213 No. 3,0
No. 46,120, No. 3,188,210, No. 3,45
No. 4,400.

No. 3,544,323, No. 3,573.917, No. L674,495.

#3,785,825, British Patent No. 1,277.6
02, 1.251,345, 1.26),
No. 005, No. 1.329,888, No. 1,33
0,932, German Patent No. 854,890, etc., as well as the 18th edition in which these compounds were used alone or in combination as photosensitive components. The invention can be applied favorably.

These photosensitive components include 0-quinonediacidosulfonic acid ester or 0-quinonediazidecarboxylic acid ester of an aromatic hydroxy compound, and 0-quinonediazide sulfonic acid or 0-quinonediazidecarboxylic acid amide of an aromatic amino compound. Also included are those in which these 0-quinonediazide compounds are used alone, and those in which they are mixed with an alkali-soluble resin and this mixture is provided as a photosensitive layer.

The alkali-soluble resins include novolak-type phenolic resins, and specifically include phenol formaldehyde resins, cresol formaldehyde resins, phenol-cresol mixed formaldehyde resins, and cresol xylenol mixed formaldehyde resins.

Furthermore, as described in JP-A No. 50-125806, in addition to the above-mentioned phenol resins, resins having 3 to 8 carbon atoms such as heapylphenol formaldehyde resin are used.
A combination of a condensate of 7enol*takecresol substituted with an alkyl group and formaldehyde can also be used.

If necessary, additives such as dyes, plasticizers, and components imparting printout performance can be added to the photosensitive layer containing the o-ji nondiazide compound as a photosensitive component.

The present invention can be applied to a photosensitive layer containing an 0-quinone noasite compound as a photosensitive component in an amount per unit area of at least about 0.5 to 7 g/-2.

81 The image exposure of a positive PS plate to which the method of the present invention is applied does not need to be particularly changed and may be carried out according to a conventional method.

Typical photosensitive components of the negative-type photosensitive layer are diazo compounds, such as diazo resins, which are condensates of diazonium salts and/or p-diazophenylamine and formaldehyde, as described in Japanese Patent Publication No. 7364/1983. Phenol salt or fluorocaprate of p-diazodiphenylamine described, 3-methoxydiphenylamine-4 described in Japanese Patent Publication No. 49-48001
- Diazo resin consisting of a solvent-soluble salt of a copolycondensate of noazonium chloride, 4-nitrodiphenylamine and formaldehyde, 2-methoxy-4-hydroxy of a condensate of p-diazodiphenylamine and formaldehyde Examples include 5-benzoylbenzenesulfonate, tetrafluoroborate of a condensate of p-diazodiphenylamine and formaldehyde, and hexafluorophosphate.

The present invention can also be preferably applied to a negative type 15 plate containing these as photosensitive components.

In addition to those using these diazo compounds alone, the present invention can also be applied to those used in combination with various resins in order to improve the physical properties of the photosensitive layer.

Such resins include shellac, derivatives of polyvinyl alcohol, copolymers having an alcoholic hydroxyl group in the side chain described in JP-A-50-118802, and copolymers having alcoholic hydroxyl groups in the side chains described in JP-A-55-155355. Examples include copolymers having a phenolic hydroxyl group in a side chain.

These resins include copolymers containing at least 50% by weight of structural units represented by the following general formula;
R.

-(CI(2-C)-Coo(CH3CHO)nH ) and 1 to 80 mol% of monomer units having an aromatic hydroxyl group, and 5 to 90 mol% of acrylic ester and/or methacrylic ester* units, and 10 to 200 acid This includes polymeric compounds with valence.

The photosensitive layer of the negative PS plate to which the processing method of the present invention is applied may further contain additives such as dyes, plasticizers, and components imparting printout performance.

The amount per unit area of the photosensitive layer is at least 0.1 to
The present invention can be applied to a range of 7 g/2 g.

There is no particular need to change the image exposure of the negative PS plate processed by the processing method of the present invention, and a conventional method may be used.

The developer used in the present invention is preferably an aqueous alkaline developer, and examples of the alkaline agents used in the developer include sodium silicate, potassium silicate, sodium hydroxide, lithium hydroxide, tribasic sodium phosphate, and triphosphate. Inorganic alkaline agents, such as sodium acid, tribasic potassium phosphate, potassium diphosphate, triammonium phosphate, ammonium diphosphate, sodium metasilicate, sodium bicarbonate, sodium carbonate, potassium carbonate, ammonium carbonate, etc. Organic alkaline agents such as , di-, or triethanolamine and tetraalkylammonium hydroxide, organic ammonium silicates, and the like are useful.

The content of alkaline agent in the developer composition is 0.05
It is suitable to use in the range of ~30 weight percent,
More preferably, it is 0.1 to 20 weight percent.

The developer used in the present invention can further contain an organic solvent. Examples of organic solvents include ethylene glycol monophenyl ether, pencil alcohol, n-
Propyl alcohol and the like are useful. The content of the organic solvent in the developer composition is preferably 0.5 to 15% by weight, more preferably 1 to 5% by weight.
Weight percentage.

It is preferable that the developer further contains a surfactant, particularly an anionic surfactant. Examples of anionic surfactants include higher alcohol (C, to C82) sulfate ester salts [e.g., sodium salt of lauryl alcohol sulfate, sodium salt of octyl alcohol sulfate, ammonium salt of lauryl alcohol sulfate, [ TeepOl B-81J (trade name, manufactured by Shell Chemical), secondary sodium alkyl sulfate, etc. 1,
Aliphatic alcohol phosphate ester salts [(e.g., sodium salt of cetyl alcohol phosphate ester, etc.),
Alkylaryl sulfonic acid salts (e.g., sodium salt of dodecylbenzenesulfonic acid, sodium salt of isopropylnaphthalene sulfonic acid, sodium salt of sinaphthalene disulfonic acid, sodium salt of metanitrobenzene sulfonic acid, etc.), sulfonic acid salts of furkylamide (e.g., sodium salt of cl yHs+C0NCl1zCHzSOJ
a), two groups CH.

Examples include sulfonic acid salts M of fatty acid esters (for example, sodium sulfosuccinate dioctyl ester, sodium sulfosuccinate dihexyl ester, etc.). Among these, sulfonate salts are particularly preferably used.

In order to further improve the developing performance, the following additives are added to such a developing solution. For example, JP-A-5
Neutral salts such as NaCl and KCIKBr described in JP-A No. 8-75152, ED described in JP-A-58-190952
Chelating agents such as TA and NTA, JP-A-59-12133
[C0(NH3)] @C13, Cocl described in Publication No. 6
complexes such as a.6H20, sodium flukylnaphthalenesulfonate described in JP-A No. 50-51324, N-tetradecyl-N1N-dihydroxyethylbetaine, etc. 7
Ionic or amphoteric surfactants, U.S. Pat. No. 4,374,920
Non-ionic surfactants such as tetramethyldecynol described in the specification of JP-A No. 55-95946, cathodic polymers such as quaternized methyl chloride of p-dimethylaminomethylpolystyrene described in JP-A-55-95946; 1972-
Ampholytic polymer electrolytes such as a copolymer of vinylvencursilimethylammonium chloride and sodium acrylate described in JP-A No. 142528, reducing amorphous salts such as sodium sulfite described in JP-A-57-192952, JP-A-Sho 57-192952; 58-5
Inorganic lithium compounds such as lithium chloride described in Japanese Patent Publication No. 9444, organic lithium compounds such as lithium benzoate described in Japanese Patent Publication No. 50-34442, JP-A-59-7525
4, such as the enriched metal surfactant containing Si, Ti, etc. described in Japanese Patent No. 59-84241, the organoboronide compound described in JP-A-59-84241, and the tetraalkylammonium oxide described in European Patent No. 101010. Examples include organic solvents such as ammonium salts, benzyl alcohol, ethylene glycol monophenyl ether, and the like.

Various conventionally known methods can be used to develop the PS plate with such a developer.

Namely, methods include spraying a developer from a number of nozzles onto the image-exposed photosensitive layer of the PS plate, immersion treatment in a large amount of developer, and applying the developer onto the surface of the photosensitive layer of the PS plate using a roller. Examples include methods. It is also possible to use a method in which, after supplying a developer to the photosensitive layer of the PS plate as described above, or lightly rubbing the surface of the photosensitive layer with a brush or the like while immersed in the developer.

Development conditions may be appropriately set depending on the above-mentioned development method, PS plate, properties of the developer, and the like. Further, there may be a plurality of developing tanks, and the developing solution or developing conditions may be different from each other.

In order to compensate for fatigue due to processing of the PS plate or absorption of carbon dioxide in the air, the developer may be supplemented with a developer replenisher depending on the state of fatigue. Conventionally known compositions and replenishment methods may be used for supplementary charging.

The lithographic printing plate thus obtained is immediately treated with water containing a surfactant without washing with water.

In the present invention, water containing a surfactant stabilizes the dispersion of developer components, dissolved photosensitive layer compositions, etc. that are brought in by adhering to the developed planographic printing plate, and prevents them from sticking to the surface of the planographic printing plate even after drying. It is considered to have an effect.

Examples of such surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polystylphenyl ether, polyoxyethylene polyoxypropylene alkyl ether, glycerin fatty acid partial esters, and sorbitan fatty acid partial esters. , pentaerythritol fatty acid partial esters, propylene glycol monofatty acid esters, sucrose fatty acid partial esters, polyoxyethylene sorbitan fatty acid partial esters, polyoxyethylene sorbitol fatty acid partial esters, polyethylene glycol fatty acid esters, polyglycerin fatty acid partial esters , polyoxyethylenated castor oils, polyoxyethylene glycerin fatty acid partial esters, fatty acid jetanol 7mides, N,N-bis-2-hydroxyalkylamines, polyoxyethylene alkylamines, triethanolamine fatty acid esters, Nonionic surfactants such as alkyl amine oxides, fatty acid salts, avicenates, hydrodoutial fl sulfonates, alkanesulfonates, dialkyl sulfosuccinate ester salts, linear alkylbenzene sulfonates, branched chain alkylbenzene sulfones Acid salts, alkylnaphthalene sulfonates, alkylphenoxypolyoxyethyleneprobyl sulfonates, polyoxyethylene alkyl sulfophenyl ether jJ[, N-methyl-N-oleyl taurine sodium M, N-furkylsulfosuccinic acid monoamide disodium Salts, petroleum sulfonates, sulfated castor oil, sulfated beef leg oil, sulfate ester salts of fatty acid alkyl esters, alkyl sulfate ester salts, polyoxyethylene alkyl ether sulfate ester salts, fatty acid monoglyceride sulfate ester salts, polyoxyethylene alkylphenyl Ether sulfate ester salts, polyoxyethylene styryl 7-unyl ether sulfate ester salts, alkyl phosphate ester salts,
Polyoxyethylene alkyl ether phosphate ester salts, polyoxyethylene alkyl phenyl ether phosphate ester salts, partially saponified products of styrene-maleic anhydride copolymer, partially saponified products of olefin-maleic anhydride copolymer, naphthalene 7-ionic surfactants such as sulfonate formalin condensates, cationic surfactants such as alkylamine salts, quaternary ammonium salts, polyoxyethylene alkylamine salts, polyethylene polyamine derivatives, carboxybetaines, aminocarbons Examples include amphoteric surfactants such as acids, sulfobetaines, aminosulfate esters, and imidazolines.

Among the surfactants listed above, polyoxyethylene includes polyoxymethylene, polyoxypropylene,
It can also be read as polyoxyalkylene such as polyoxybutylene, and these surfactants are also included, and the same applies to (1) in the following description.

Among these, polyoxyethylene alkyl ethers,
Polyoxyethylene alkylphenyl ethers, polyoxyethylene polystyrylphenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, glycerin fatty acid partial esters, sorbitan fatty acid partial esters, pentaerythritol fatty acid partial esters, propylene glycol monofatty acid esters, polyoxyethylene sorbitan fatty acid partial esters, polyo-diethylene glycerin fatty acid partial esters, polyethylene glycol fatty acid esters, polyoxyethylated castor oil, dialkyl sulfosuccinates, alkylbenzene sulfonates, alkylnaphthalene sulfonates, Alkyl sulfate ester salts, fatty acid salts, mialkyl phosphate ester salts, naphthalene sulfonate formalin complexes, polyoxyethylene alkyl amine salts, alkyl amine salts, and quaternary ammonium salts reduce the oil sensitivity of the image area of lithographic printing plates. Among these, polyoxyethylene alkylphenyl ethers, polyoxyethylene polystyrylphenyl ethers, polyoxyethylene alkyl ethers, glycerin fatty acid partial esters, sorbitan fatty acid partial esters, and polyoxyethylene sorbitan fatty acids are preferred. Partial esters, pentaerythritol m
Particularly preferred are ASS classification esters, propylene glycol monofatty acid esters, polyethylene glycol fatty acid esters, dialkyl sulfosuccinate ester salts, alkyl sulfate ester salts, and alkylbenzene sulfonate salts.

The most preferred are alkylbenzene sulfonic acid salts and dialkyl sulfosuccinate ester salts, which have strong dispersing power.

The above surfactants can be used alone or in combination of two or more, and are about 0.1% to about 20% by weight, more preferably 0.5% to 10% by weight in an aqueous solution.
Used in a range of % by weight.

The pH of the aqueous solution containing the surfactant in the present invention is 1 to 1.
2 is preferred. To adjust the aqueous solution to this pH,
It is preferable to contain either or both of an acid and a water-soluble salt as a buffer. As a result, when the aqueous solution is applied to a lithographic printing plate, the developer components remaining on the plate are neutralized, and the non-image areas become more hydrophilic.

Details of buffering agents are described, for example, in [Chemistry Handbook II Edition ■], Nippon Kagaku Zenhen, February 20, 1972, 5th edition, published by Maruzen Co., Ltd., pages 1312-1320, and these are Can be applied.

Suitable acids and water-soluble salts include molybdic acid, boric acid,
With acids such as inorganic acids such as nitric acid, sulfuric acid, phosphoric acid, and polyphosphoric acid, and water-soluble organic acids such as acetic acid, oxalic acid, tartaric acid, benzoic acid, succinic acid, citric acid, malic acid, lactic acid, and p-)luenesulfonic acid. I can give you the salt. More preferred salts are water-soluble alkali metal salts and ammonium salts, and particularly preferred are molybdates such as ammonium molybdate, phosphates such as sodium phosphate, polyphosphates such as potassium tetrapolyphosphate and sodium trimetaphosphate, and sodium oxalate. These are oxalates such as, tartrates such as potassium tartrate, succinates such as sodium succinate, and citrates such as ammonium citrate. These acids and water-soluble salts can be used alone or in combination.

A more preferable pH of an aqueous solution containing these surfactants is 1.5 to 8. The most preferable pH is 2.0-6°5
In this case, the desensitization performance of the non-image area of the lithographic printing plate becomes higher.

In addition, in the plate making method of the present invention, developer components are brought into the aqueous solution, so in order to neutralize this, salt and/or acid is added in advance in an amount corresponding to the planned processing area of 28 plates. It is preferable to leave it there.

The amount of acid and salt added to the aqueous solution is not particularly limited, but the total amount of acid and salt is about 10% based on the total weight of the aqueous solution.
It is preferably less than % by weight.

More preferably, it is used in a range of 0.01 to 6% by weight.

The aqueous solution containing the surfactant in the present invention further includes sorbic acid, preservatives such as ethyl p-oxybenzoate, fungicides, propyl gallate, 2.6-sheet-t-butyl-4-ethylphenol, 2. It is possible to contain an antioxidant such as 6-t-butyl-4-methylphenol.

By adding a small amount of these preservatives such as preservatives, antifungal agents, and antioxidants, it is possible to prevent deterioration in quality due to storage of the aqueous solution, but the preferable addition amounts are o, oo, etc.
t~5% by weight.

It is preferable that the aqueous solution containing the surfactant in the present invention contains a lipophilic substance.

As a result, the image area of the lithographic printing plate shows higher oil sensitivity, which not only makes it easier to build up the developing ink, but also makes it easier to apply the plate surface protectant after treatment with the aqueous solution. The end result is to strongly suppress the decrease in oil sensitivity.

Preferred lipophilic substances include organic carboxylic acids having 5 to 25 carbon atoms, such as oleic acid, lauric acid, valeric acid, nonylic acid, capric acid, mystilic acid, palmitic acid, castor oil, and the like. These lipophilic substances can be used alone or in combination of two or more.

The lipophilic substance contained in the surfactant-containing aqueous solution in the present invention is 0.005% by weight based on the total amount.
to about 10% by weight, more preferably 0.05 to 5% by weight
is within the range of

In the present invention, it is preferable to squeegee as little developer as possible on the lithographic printing plate surface after development. By squeegeeing to reduce the amount of developer on the planographic printing plate, contamination of the aqueous tS solution containing a surfactant by washing water is prevented as much as possible, and processing capacity with an aqueous solution containing a surfactant is increased. It is from.

Therefore, the amount of residual developer on the lithographic printing plate after being squeegeeed is preferably 12 mt'/2 or less, more preferably 9 wl/m" or less, and most preferably 5 mt'/m"/m2 or less.
Import is 2 or less. ``There are various methods of treatment with an aqueous solution containing a surfactant, such as dipping, applying with a roller, and spraying from multiple nozzles onto a planographic printing plate or roller. By repeatedly using the aqueous solution containing the surfactant and ejecting it from multiple nozzles at the same time, it is possible to greatly reduce the amount of the aqueous solution containing the surfactant used per 28 plates to be processed, thereby reducing printing stains. This is preferable because it is more effective in preventing occurrence.

The flow rate of the aqueous surfactant solution supplied onto the lithographic printing plate is preferably 11/win, preferably 401/sin or less, and more preferably 3 to 201/sin.

It is desirable that the lithographic printing plate treated with an aqueous solution containing a surfactant be squeegeeed so that the amount and thickness of the aqueous solution coated are as uniform and appropriate as possible.

Desirable coating amount is 1me/m" or more, 20m1/a+"
It is as follows.

A more preferable coating amount is 2mj! /m'' or more, and 10-17 m2 or less, which reduces coating unevenness, including the edge portions (commonly called selvage portions) of the lithographic printing plate.

Methods of squeegeeing the plate surface of a planographic printing plate include, for example, using an air knife to squeeze out the liquid, or passing the planographic printing plate between a pair of elastic rollers whose surfaces are covered with an elastic material such as rubber, and applying the nip pressure. A method of squeezing out the liquid on the plate surface, or placing an elastic material with a smooth surface along the transport path of the planographic printing plate,
It is possible to adopt a method of scraping off the liquid on the plate by bringing the plates into sliding contact.

A more effective squeegee method is to pass a lithographic printing plate between a pair of elastic rollers, and apply a load between the pair of rollers. More preferably, a third loaded roller is placed on top of the pair of rollers. It's a method.

The above elastic materials include natural rubber, cis-polyisoprene rubber, styrene-butadiene rubber, cis-polybutadiene rubber,
Chloroprene, butyl rubber, nitrile butadiene rubber,
Examples include ethylene propylene rubber, Hypalon (chlorosulfonated polyethylene), acrylic rubber, urethane rubber, silicone rubber, fluororubber, neoprene rubber, polysulfide rubber, and plastics.

Butyl rubber, nitrile butanoene rubber, ethylene propylene rubber, acrylic rubber, silicone rubber, fluorine rubber,
Polysulfide rubber has excellent oil resistance and is therefore suitable and preferred for rollers in the surfactant aqueous solution treatment section.

In addition, in a method of passing a lithographic printing plate through a pair of elastic rollers with a squeegee, and more preferably, in a method of treating an aqueous surfactant solution by spraying it from a number of nozzles, the lithographic printing plate may be treated with an aqueous surfactant solution. After passing through
In order to save unnecessary power, it is preferable that the processing device is designed so that at least one of the conveyance by the pair of rollers and the jetting by the nozzle is stopped (hereinafter simply referred to as "stop").

However, during this pause period, the aqueous surfactant solution often accumulates on the contact area between the pair of rollers and dries and solidifies, and in this case, the coating film thickness of the aqueous surfactant solution is It tends to be uneven. A method to avoid this situation is to keep the pair of rollers spinning even while the surfactant aqueous solution treatment is paused, and to apply water from multiple nozzles during the treatment and/or while the treatment is paused. It is preferable to use at least one method such as spraying the surfactant aqueous solution onto the pair of rollers to delay drying of the pair of rollers.

It is preferable that the lithographic printing plate treated with an aqueous solution containing a surfactant be dried to prevent dust from adhering thereto or to facilitate handling.

The preferred drying temperature is 20-120°C. The thus obtained lithographic printing plate is then subjected to various steps such as development ink application, addition, stopping of erasing, etc., and treatment with a plate surface protectant.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

[Example] First, the following PS plate A and B were prepared and exposed.

In addition, % in the following text indicates weight %, and part indicates weight part.

CPS version A] A JIS 1050 aluminum plate with a thickness of 0.24 mm was immersed in a 9 um aqueous solution, degreased, and then electrochemically treated in a dilute nitric acid solution. After the aluminum plate was roughened and thoroughly washed, it was anodized in a dilute sulfuric acid solution to form an oxide film of 2.5 g/m'' on the surface of the aluminum plate.

After washing the obtained aluminum plate with water and drying, a photosensitive solution having the following composition was applied to give a dry weight of 2.5 y/m2, and the size of the 0th plate was 1003 x 80.
016111.

(Photosensitive liquid) Pyrogallol-acetone resin 7-toquinone-1,2-noanodo(2)-5-sulfonic acid ester (Example 1 of JP-A-43-28403)
(synthesized by the method described in )...1 part cresol-xylenol-formaldehyde resin...3 parts te
rt-butylphenol-formaldehyde resin 0.1 part Oil Blue #603 (Orient Chemical Co., Ltd.)
0.03 parts crystal violet (manufactured by B, ^, S, F, dye)
...0.03 part ethylene glycol monoethyl ether ...2
0 copies This 18th plate [A] was adhered to a transparent positive film and exposed for 60 seconds from a distance of 70 cm using a 2 kilowatt metal halide lamp.

(PS version B) A JIS 105G aluminum plate with a thickness of 0.24I was immersed in a 20% sodium phosphate aqueous solution to degrease it, electrochemically roughened in a dilute nitric acid solution, thoroughly washed, and then diluted. 1.5g/m by anodizing in sulfuric acid solution
An oxide film of No. 2 was formed on the surface of the aluminum plate.

The obtained aluminum plate was further immersed in an aqueous sodium metasilicate solution for pore sealing ν1, washed with water, and dried, after which the following photosensitive solution was applied to a dry weight of 2.0 g/vb. After drying, an 18th plate [B] was obtained.The size of the plate was the same as that of PS plate rA].

(Photosensitive 8) Hexafluorophosphate of condensate of p-noazodiphenylamine and paraformaldehyde...1 part 2-hydro-diethyl methacrylate copolymer (implementation of British Patent No. 1,505,739) Example 1
)...40 parts Bikushiri 74 Pure Pot Blue BOH (manufactured by Hodogaya Chemical Co., Ltd., dye)...0.2 parts Ethylene glycol monomethyl ether... 10
A transparent negative film was brought into close contact with this PS plate rB] and exposed for 30 seconds using a 2 kilowatt metal halide lamp from a distance of 7 Oam.

Example 1 The above-exposed 18th plates [A] and [B] were developed at 25° C. for 40 seconds using an automatic developing machine as shown in FIG. Figure $1 is a schematic side sectional view showing the development processing apparatus used in this example. The entire processing apparatus consists of a development processing section and a surfactant aqueous solution processing tank. The development processing section mainly includes a development processing tank 1, a transport roller 3, a brush roller 4, a liquid supply nozzle 8, a squeezing roller 5, a pair of skewer rollers 6, a roller holder, a developer storage tank 10, and a developer supply pump. 9. During development, a developer supply pump 9 operates to supply the developer from the developer supply nozzle 8 onto the 18th plate.

The liquid used in the developing process is squeezed by the aperture Qa-25, and returned to the developer storage tank 10 for circulation.

The surfactant aqueous solution processing section mainly includes a surfactant aqueous solution processing tank 2, a conveyance loaf 3, a skewer roller 6', and a squeezing roller 5.
It consists of an upward supply nozzle 8゛, which supplies surfactant water II, which is sent by a pump 11 and circulated, to the planographic printing plate that has passed through the development processing section and is used for circulation. It has become.

The developer was as follows.

(Developer) Sodium silicate (Japanese Industrial Standard Sodium Silicate No. 3)
・・・・・・100 parts □ Sodium hydroxide
...8 parts sodium sulfite
・・・・・・Part 4 □ Berex NBL
(t-Butylnaphthalenesulfonic acid/chemical industry atlas (
Co., Ltd.)...10 parts water...
... 688 copies Meanwhile, in the surfactant aqueous solution processing tank, a surfactant solution 61 having the following composition is circulated at a flow rate of 81/lll1n and is ejected from a large number of nozzles, while the above-described developed lithographic printing is carried out. Version [AI and [B]
Both were treated for 15 seconds.

(Aqueous surfactant solution) C(2-ethylhexyl) sulfonic acid ester sodium salt...30 parts sodium dihydrogen phosphate, water salt, 0 parts citric acid, water salt
・・・・・・ 2 parts water ・・・
The amount of liquid remaining on the plate after squeezing in each processed portion of 000 copies of the bow was approximately 11111#/112 for the developer and approximately 6 1/2 for the surfactant solution.

Next, when the obtained printing plates [AI and [B] were printed using a printing press, printed matter with sufficient ink density without staining in the non-image area was obtained in both cases.

In addition, the number of sheets required from the start of printing until a printed matter with sufficient ink density is obtained (hereinafter referred to as the number of sheets with initial inking during printing) is as low as 13 sheets for the printing plate [AI] and 18 sheets for the printing plate [B]. It has been found that this is a plate-making method that does not reduce the oil-insensitivity and provides a printing plate with improved oil-sensitivity.

Comparative Example 1 A waste water pipe was provided in the surfactant aqueous solution treatment tank of the automatic processor of Example 1, and the surfactant aqueous solution treatment tank was used as a washing tank and tap water from another pipe was used for washing under running water (washing with water). The procedure was the same as in Example 1, except that the amount of water was 10Z/printing plate 112). As a result, the printing version [AI and [B]
There was no stain in the non-image area during printing in any of the cases, but the initial number of inked sheets during printing was 21 sheets for the printing plate [AI] and 21 sheets for the printing plate [B].
] was 32 sheets, and all of them had inferior oil sensitivity compared to the case where they were not washed with water. Additionally, a large amount of waste water was generated, including exhausted developer solution that had adhered to the developer plates and was collected in the washing water.

Comparative Example 2 A waste liquid tank was provided in the surfactant aqueous solution processing tank of the automatic processor of Example 1, and the surfactant aqueous solution tank was used as a washing tank, and a small amount of running water was used for washing (washing) using tap water from another pipe. Example 1 except that the amount of water was 100 w1/1 printing plate 2)
I did the same thing.

As a result, the non-image areas of both printing plates [AI and [B] were smeared during printing, and the initial number of inked sheets during printing was 30 sheets for printing plates [AI and 60 sheets for printing plate [B]. Compared to the case without water washing, printing performance and oil sensitivity were also lower.

Comparative Example 2 A waste liquid tank was provided in the surfactant aqueous solution processing tank of the automatic processor of Example 1, and as in Comparative Example 1, tap water from another pipe was used in the processing tank to run a small amount of water (water volume: 80 wheels). / printing plate 1 m2), and otherwise treated the 15th plate [AI and [B] in the same manner as in Example 1,
When a printing test was conducted, stains occurred in the non-image areas of all plates, and the initial number of inked sheets during printing was 31 sheets for the printing plate [AI] and 58 sheets for the printing plate [B], compared to the treatment of the present invention. The printing performance and oil sensitivity deteriorated in the past.

Example 2 The above-exposed 15th plate [AI print [B] was processed using an automatic developing machine as shown in FIG. seconds, ps version [B
] was developed at 25° C. for 30 seconds. The amount of developer supplied was 4501 per 18th plate 1-2.

(Developer) Sodium silicate (Japanese Industrial Standard Sodium Silicate No. 3)
...100 parts Potassium hydroxide aqueous solution (48%) ...58 parts Sodium isopropylnaphthalene sulfonate (Aerosol O8, manufactured by American Cyanamid) ...10 parts Sodium sulfite ...5 parts pencil alcohol ...20 parts water
...800 parts Meanwhile, in the surfactant aqueous solution processing section, a surfactant solution having the composition shown below after being diluted in an automatic processor was mixed into a liquid volume of 9200e+Z per printing plate 2 plows. The developed planographic printing plates [AI and [
B] were treated for 10 seconds each.

(Surfactant aqueous solution) Lauryl alcohol sulfate ester sodium salt...30 parts dihydrogen phosphate) +7um trihydrate...10 parts citric acid -hydrate...・・2 parts water
・・・・・・１
The amount of liquid remaining on the plate after squeezing in each processing section of 000 copies was approximately 6 et'/+++2 for the developer and approximately 3.5 et'/+2 for the surfactant solution.

Next, when the obtained printing plates [AI and [B] were printed using a printing press, printed matter with sufficient ink density without staining in the non-image area was obtained in both cases. In addition, the initial number of sheets inked during printing is 16 sheets for printing plate [AI], 16 sheets for printing plate [B
] was as few as 20 sheets, and it was found that this plate-making method does not reduce the oil-insensitivity and provides a printing plate with excellent oil-sensitivity.

FIG. 2 is a schematic side sectional view showing the automatic developing machine used in the implementation of this example.

The entire processing apparatus consists of a development processing section and a surfactant aqueous solution processing tank.

The development processing section mainly includes a development processing tank 21 and a conveyance roller N2.
3, a brush roller 24, a squeeze roller pair 25, a receiver roller 26, a skewer roller pair 27, a developer supply nozzle 28, and a developer supply pump 9. It is supplied from the supply nozzle 28. The used developer is squeezed by a squeeze roller pair 25 and collected at the bottom of the developer tank for circulation. The exhausted waste liquid is collected into the waste liquid tank 31 by opening the waste liquid valve 30.

The surfactant aqueous solution processing section mainly consists of a surfactant treatment tank 22, a transport roller 23°, a receiver roller 26°, a pair of smudge rollers 25°, and a surfactant solution supply nozzle 28°. Pump 32. The surfactant aqueous solution 1 (undiluted solution) sent by the pump 32 and the dilution water sent by the pump 32 are mixed into the mixer 3.
6 and then supplied from a surfactant solution supply nozzle 28'.

34 is a surfactant aqueous solution (undiluted solution) tank, 34' is a dilution water tank, 33 is a waste liquid tank, and 35 is a pipe connected to the water supply.

Comparative Example 3 A waste water pipe was installed in the surfactant aqueous solution processing section of the automatic processor of Example 2, and running water was washed using tap water from another pipe (
The same procedure as in Example 2 was carried out except that the amount of washing water was 1O1/1 printing plate 2). As a result, the printing version [AI and [
B] There was no stain in the non-image area during printing, but
The initial number of inked pages during printing is 24 sheets for the printing plate [AI], 24 sheets for the printing plate [
B1 had 36 sheets, all of which were inferior in oil sensitivity compared to the case where they were not washed with water. In addition, a large amount of wastewater was generated, including exhausted developer that had adhered to the plate after development and was collected in the washing water. Comparative Example 4 The same procedure as in Example 2 was carried out except that water was added instead of the surfactant aqueous solution in the surfactant aqueous solution treatment tank of the automatic processor of Example 2.

As a result, the non-image areas of both printing plates [AI and [B] were smeared during printing, and the initial number of inked sheets during printing was 39 sheets for the printing plates [AI and 68 sheets for the printing plate [B]. Compared to the case without water washing, printing performance and oil sensitivity were also reduced.

[Effect of the invention J = 40 - By the present invention, negative type and positive type 28 can be produced without washing with water.
By processing plates in parallel using the same automatic processor, it has become possible to stably produce lithographic printing plates of good quality. Since there is no washing process, there is no problem of water wastage or environmental pollution caused by wastewater. Furthermore, since the treatment of the present invention improves the oil-insensitivity of non-image areas without impairing the oil-sensitivity of image areas, the resulting lithographic printing plate has extremely good printability and excellent ink receptivity at the start of printing. Less paper is generated. Even if the obtained lithographic printing plate is immediately gummed, the ability of the plate surface protection agent will not be reduced, and work such as development ink application and correction can be carried out as easily as when using a plate that has been thoroughly washed with water. can.

[Brief explanation of the drawing]

1 and 2 are schematic side sectional views showing the structure of an automatic developing machine used in an embodiment of the present invention. Applicant Konishiroku Photo Industry Co., Ltd. Procedural Amendment 1. Indication of the case 1985 Patent Review No. 175400 2 Name of the invention Processing method for photosensitive lithographic printing plates 3 Person making the supplement Relationship to the case Patent applicant address 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 191 Sakura-cho, Kuchino-shi, Tokyo Konishiroku Photo Industry Co., Ltd. (Tel: 0425-83-152
1) Patent Part 5, "Detailed Description of the Invention" column and drawings of the specification subject to amendment. 6. Contents of amendment 1) The "Detailed Description of the Invention" of the specification will be corrected as follows. .

Claims (1)

[Claims] Using an automatic processor, negative photosensitive lithographic printing plates and/or
Alternatively, in a processing method in which a positive-working photosensitive lithographic printing plate is automatically transported and developed, the negative-working and/or positive-working photosensitive lithographic printing plate is developed with the same developing solution that is used repeatedly. , a method for processing a photosensitive lithographic printing plate, characterized in that it is immediately treated with an aqueous solution containing a surfactant.