DE1447963B2 - PROCESS FOR MANUFACTURING AN OFFSET PRINTING FORM FROM A PRESENSITIZED PRINTING PLATE MATERIAL - Google Patents

Description

3 4

The resols which can be used according to the invention as resin in the amount of photosensitive agent and a polyhydric alcohol layer are organic. Examples of polyhydric alcohols that can be used are solvents and, in an aqueous alkaline solution, ethylene glycol or glycerine.
Solution soluble, meltable, by mere heating The amount of resin in the solution should preferably be hardenable condensation products of formaldehyde 5 between 3 and 20 percent by weight, based on that with a phenol. The total solution according to the invention is also. Novolaks which can be used for the purposes of the invention are also condensation solutions containing novolak products made from formaldehyde and a phenol;
with them the condensation is carried out in such a way that solutions that are invented are such that condensation products are formed which can be used according to the present invention, whose resins cannot be hardened by the application of heat and solvents are only partially soluble in water. therefore permanently thermoplastic even when heated. Such resin solutions are preferably used in and remain soluble. It is of course also possible to emulsify water in a mixed form, the aqueous phase of novolaks and resols being used. 15 of the emulsion contains an organic kol novolak which is soluble in water, and among these, in particular, contains a thickener due to conloids. Such emulsified densation of O-cresol with formaldehyde produced resin solutions are described, for example, in the German Pa-Novolak, are particularly recommended for the process 1 143 710,
It is worthwhile because when they are used, the photosensitive substance occurring in the zen of the printing plate material contain ver ao printing plates according to the invention at least one contamination of the image background, of which further un-ester or at least one amide of an O-naphtha is still mentioned will be removed with relatively thoquinonediazide sulfonic acid or an O-Naph weak cleaning agent. Such connections can. Novolaks with melting points between 35,854,890, 865,108, 865,109, 879,205, 938,233, 70 and 130 ° C. are preferably used for the process, for example in German patents. '1109 521, 1114705, 1118 606, 1120273 and

The present required according to the invention 1 124 817 described. In the certificates of the resins mentioned when the forming solutions are heated, the concentration of diazo sites in the layer should preferably be 0.1 to 8 percent by weight, but preferably 1 to 4 percent by weight of the photosensitive resin .
Layer already in the manufacture of the presensitizing. All printing plate material used in printing technology is incorporated as a layer carrier. The amount of resin contained in the light-sensitive layer of nium, zinc or steel plates or multi-metal plates should be between 25 and 2000 values such as chrome-copper plates, chrome-copper weight percent, based on the amount by weight on 35 aluminum plates or a chromium-copper-zinc light-sensitive diazo compound. Very plates. The plates can be smooth or chemical, but good results and easy handling of the printing - mechanically or electrolytically roughened or pre-plate material result if the resin-treated surfaces have,
amount at least 100 percent by weight and not A substantial part of the process is the increase of more than 600 percent by weight, based on the weight of the printing form in the presence of the novolak or amount by weight of diazo compound. Resols.

The image areas of the layer can, however, also be brought together in How high the heating temperature is above 180 ° C. with the resin, which according to the invention may be, depends, among other things, on the resin used during heating and on the temperature resistance of the that you get a solution of the resin in 45 layer support. In the case of supports made from an organic solvent, the coated aluminum is preferably heated to 200 to 250 ° C. The Er surface of the printing plate material is applied and the duration of the heating depends on the amount of drying. This can be done at any time before the temperature used, generally between 5 and the heating; but the application is done for 60 minutes. The application is moderately longer than the resin solution, most expediently after the necessary heating times have developed, for example winding the exposed layer. Heating times that are twice as long are sufficient, generally causing overpainting of the surface to be treated, which is common apart from wasting time and is not serious, but you can also deal with the varnish several times. The application of a resin solution can also be used with a stainless steel carrier. At temperatures which are in the light-sensitive temperatures around 450 ° C., a heating time of the layer of 30 seconds to be used according to the invention has proven to be sufficient.
Contains resin, for example in order to increase the amount of resin present during the heating to be carried out according to the invention. but in any case for such a long time at such a high temperature

To be carried out in the possibly applied resin solutions 60 that the image areas such a change

the resins are said to have experienced such an organic solution that the picture background

means be available, which the light-sensitive is provided with a coating at least in places,

Layer not destroyed. As such organic solvents when inking the printing plate, printing ink

solvents come, for example, those and when printing a completely or largely

tracht, which are fully miscible with water, fis tenteils contaminated subsurface image obtained. Leads

in particular those mixtures that differ from the heating with water at least in this

Restricted miscible solvent, the 40 to existing way by, so that one before printing

80 percent by weight, based on the total solder, again a clean, printing ink-repellent

If you have to create an image background, you will not get any noticeable improvement in the printing plate. Of the When the printing plate material is heated, it deposits on the image background and when it is inking Coating which is colored with printing ink is usually not visible to the naked eye. If, therefore, in the following, from the contamination of the picture background and from its cleaning what we are talking about is, almost without exception, pollution that is only visible to the naked eye and a cleaning that is only perceptible to the naked eye is meant when the printing plate with a printing color or correction color has been colored is.

In most cases, the color of the copying layer changes during the heating, i. E. H. so the developed printing image. The color change depends, among other things, on that contained in the copy layer Diazo compound from. However, the color of the copy layer, for example, can be significantly different a dye contained in the layer can be influenced. In the case of copy layers produced by the diazo compound appear yellow, the color can change to pink to, for example, when heated done to deep brown. Furthermore, the layer is usually no longer photosensitive after heating.

However, it is extremely important that the layer is resistant to acids, is even against concentrated acids and against practically all organic solvents. Even against diluted ones (0.5%) alkali hydroxide solution, it is relatively stable. At the same time, the layer, i.e. that printing image, so solidified that the number of prints printable therewith even under unfavorable Printing conditions is several times higher than the print run that can be achieved with conventional methods could achieve.

A very important step in the process is to clean the background of the image again. Aqueous, weakly alkaline solutions are usually used as cleaning agents. But one is in no way limited to this. One can also use strongly alkaline solutions in some cases and in many Use acids of all kinds in cases. In practice, of course, one tries to use the weakest ones possible Solutions to get along. As a rule, therefore, when cleaning a printing plate material, if its most appropriate treatment has not yet been tried, proceed in such a way that cleaning was attempted first with aqueous weakly alkaline solutions, then with aqueous weakly and strongly acidic solutions, then with aqueous strongly alkaline solutions. The cleansing agents Sometimes they also contain organic solvents that are alkaline or acidic in the aqueous solution Substance can be dissolved or emulsified and its main task is to color to remove applied printing or correction ink. It is understandable that the pollution adhere to the metallic substrate in the individual cases with different strengths, see above that they are attacked in different ways by a particular detergent. In each In a single case, however, it was found that the contamination from the metallic substrate by monitoring the entire surface of the printing plate with at least one of the foregoing Cleaning agent can be completely removed, while the print image that is wiped over at the same time is retained stayed.

In many cases, it has proven advantageous to treat the printing plate material with an acidic one aqueous solution, e.g. with 1.8% phosphoric acid, between the first creation of a clean printing ink repellent image background and heating. Such treatment makes the metallic The picture background is more hydrophilic and thus reduces its adhesive strength compared to the when heated, the deposit precipitates on it.

The method according to the invention and the printing form obtained thereafter can be used anywhere there where previously known presensitized printing plates were only moderately successful, for example in web offset printing and when printing on plastic foils with printing inks, which Contains solvents with strong dissolving power.

It was surprising that by vigorous heating of printing formes, which a resol resin or contain a novolak, comes to printing forms with such high-quality performance properties. By namely, when heated, printing forms are initially so spoiled that they cannot be used can, since the print image obtained is littered with veils, stripes or spots, if not completely covered is. It was not to be expected that it would still be possible to produce usable printing forms from it and that printing forms that appear destroyed in this way are good after treatment for printing large editions Quality.

Examples

In the examples below, 1 part by volume (part by volume) corresponds to 1 ml, if as 1 part by weight (Part by weight) 1 g is used. Most of the examples below have been between development and heating, no correction of the printing form is made, because after developing the image background was so pure that it needed no correction.

The number of copies given in the examples cannot, of course, be absolute, but only relative information is assessed, since the achievable print run also depends on circumstances other than quality depends on the printing plate material. In order to save time and material when carrying out the experiment, In most of the examples, such a printing machine was intentionally used, which the printing forme relatively heavily used.

1. With a solution

1.5 parts by weight of the condensation product
2,3,4-trihydroxy-benzophenone and naphthoquinone- (1,2) -diazide- (2) -5-sulfochloride
(Production is described in German patent specification 938 233, p. 2, lines 75 to 91),

0.8 part by weight of the condensation product
1 mole of 2,2'-dihydroxy-l, r-dinaphthylmethane and 2 moles of napthoquinonediazide (2) -5-sulfochloride (preparation is described in German Patent 865 109 in Example 6),

6 parts by weight a novolak produced by the condensation of o-cresol and formaldehyde
from melting point 108 to 118 "C,
120 vol. Ethyl glycol monomethyl ether

was a mechanically roughened aluminum foil, using a rotating base for Spin off the excess amount of the applied solution, coated. After that, the slide was in a warm air stream and then dried for about 2 minutes at 100 ° C.

The presensitized printing plate material produced in this way can be stored for several months. It did, however Immediately after its production under a slide with a carbon arc lamp of 18 amperes ok Amperage exposed for one minute at a lamp distance of 70 cm. The exposed layer was wiped over with a cotton ball dipped in 5% trisodium phosphate solution was developed, then rinsed with water 15 rinsed with and wiped over with 2% phosphoric acid. The picture ready, appeared on development in a bright yellow color on a metallic background.

The dried printing form was then exposed in a production under a slide. then was developed with a 5% aqueous trisodium phosphate solution, rinsed with water and at 100 ° C dried. The printing form obtained showed the image on a clean, shiny, metallic background.

The printing form was then placed in a drying cabinet heated to 230 ° C. for 20 minutes left. After that, the background of the picture was completely soiled with a film. After cooling down the printing form was wiped with 5% aqueous hydrofluoric acid, with the Soiling on the image background was removed while the print image remained. After this Water was the printing form

The printing form produced in this way was used to produce 50,000 perfect prints in a printing machine. With a correspondingly manufactured,

Baking oven heated to 230 ° C and about 20 but not subjected to the heating treatment Left in it for 20 minutes. In the process, the printing form changed, on the other hand, only 25,000 prints could

the color of the image on the printing form from greenish-yellow through pink to yellow-brown. By The heating of the printing form in the oven was a Verewandireier quality with the same printing machine getting produced.

3. The roughened surface of an aluminum

2.0 parts by weight of the condensation product

1 mole of 2,3,4-trihydroxy-benztropolone and 1 mol naphthoquinone- (1,2) -diazide- (2) -4-sulfonic acid chloride (preparation is in Example 3 the German patent specification 1124 817),

5.0 parts by weight a novolak resin with a melting range of 95 to 100 ° C,

120 vol. Ethylene glycol monomethyl ether.

The layer was stabilized, but at the same time the image film was made with a solution The surface is soiled with a covering. After the printing form had cooled down, the layer side was with 5% trisodium phosphate solution was wiped off several times, the surface of the picture being cleaned of the deposit while the picture stopped. The sheet was then immersed in 2% phosphoric acid and colored using a cotton swab with bold printing ink. So a ready-made one was created Printing form.

It was used and was used in an offset printing machine to make prints at least 100,000 prints made before wear on the printing plate could be determined.

One was coated in the manner described above. In a corresponding manner, as prepared in Beizweite printing form, but with the sub-40 _sp i _e described ll, a printing plate was hergeschied that while the heating and subsequent sets, wherein for developing a l, 5 ° / o solution purifying the The printing form was used after developing with trisodium phosphate and it was developed. With the printing form produced in this way, prints were made on celt, hydrophilized and dried printing form in the same offset machine, and a drying cabinet for 20 minutes at 240 ° C. 30,000 prints showed signs of wear and tear of the hydrochloric acid.

With the printing form produced in this way, 60,000 perfect prints could be obtained in a printing machine will. When using one that is not heated after development, but otherwise in the same way If the printing form was produced in this manner, only 15,000 perfect prints could be obtained.

Printing form.

2. An electrolytically roughened aluminum foil was coated with a solution, which was composed as follows:

1.5 parts by weight of the condensation product

1 mole of phloroglucinol and 1 mole of naphthoquinone- (1,2) -diazide- (2) -5-sulfochloride (Production is described in example 1 of German patent specification 1109 521),

6 parts by weight a novolak resin with a melting range ^{between 100 and 12O 0 C,}

120 vol. Ethylene glycol monomethyl ether.

The applied layer was dried in a stream of warm air.

The photosensitive printing plate material thus prepared was storable for many months, but In the present example, it became immediately after the

4. A solution was applied to the mechanically roughened surface of an aluminum foil, the

2.0 parts by weight of the condensation product

1,2,3-trihydroxy-anthraquinone and naphthoquinone- (1,2) -diazide- (1) -6-sulfonic acid chloride (Manufacture is described in French patent specification 1,267,374 with reference to the Formula 13 contained therein is described),

5.0 parts by weight of a novolak made from cresol and formaldehyde with a melting range of 90 to 105 ° C,

110 vol. Ethylene glycol monomethyl ether

209 537/323

I 447

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contains. In a manner similar to that described in Example 1, a printing form was produced, with development a 2% trisodium phosphate solution is used, the developed, hydrophilized and dried printing form Heated to 240 ° C for 20 minutes and then cleaned with 5% trisodium phosphate solution became.

With the printing form produced in this way, 60,000 perfect prints were produced, while with an in in a corresponding manner, but not subject to the heating process, only 6000 flawless printing form Prints could be made.

5. By coating the electrolytically roughened surface of an aluminum foil with a solution the end

2.0 parts by weight of the condensation product

1 mole of 2,2 ', 4,4'-tetrahydroxy-diphenyl and 3 moles of naphthoquinones, 2) -diazide- (2) -4-sulfonic acid chloride (Production is described in German patent specification 1120 273),

5.0 parts by weight of a novolak resin, whose

Melting point is in the range of 60 to 70 ° C and

100 vol. Ethylene glycol monomethyl ether

a printing form was produced in the manner described in Example 1. It was used to develop a 5% trisodium phosphate solution is used, the developed, hydrophilized and dried printing form Heated to 230 ° C for 20 minutes and, after cooling, treated with 5% trisodium phosphate solution, to remove the dirt from the picture background.

With the printing form produced in this way, 60,000 perfect prints could be produced, while with only one printing form that is not subjected to heating but is otherwise produced in a corresponding manner 25,000 prints could be obtained on the same printing machine.

6. Using the method described in Example 1, a printing form was produced, the mechanical roughened surface of an aluminum foil with a solution

2.0 parts by weight of the condensation product

1 mole of 2,3,4-trihydroxy-benzophenone and
1 mole of naphthoquinones, 2) -diazide- (2) -5-sulfochloride (production is in German
Patent 938 233),

5.0 parts by weight of a resole resin with a
Melting range from 90 to 95 ° C and

100 vol. Ethylene glycol monomethyl ether

coated, the exposed layer with 5% trisodium phosphate solution developed, heated the developed film to 230 ° C for 20 minutes and removed the contamination the image background was removed with 5% trisodium phosphate solution.

With the printing form produced in this way, 40,000 perfect prints were obtained in a printing machine, while with a printing form produced in a corresponding manner, but not subjected to heating only 20,000 perfect prints could be obtained.

7. In the manner described in Example 1, a printing form was produced by mechanically roughened surface of an aluminum foil with a solution

2.0 parts by weight of the condensation product

1 mole of 2,3,4-trihydroxy-benzophenone and 1 mole of naphthoquinones, 2) -diazide- (2) -5-sulfochloride,

5.0 parts by weight of an o-cresol-formaldehyde novolak resin with a temperature between 108 and 118 ° C lying melting range and

140 vol. Ethylene glycol monomethyl ether

coated, the applied layer dried, exposed under a template, with 5% trisodium phosphate solution developed, made hydrophilic with aqueous phosphoric acid and dried.

The printing form produced in this way was cut into two halves. One half was made with a varnish coated with the following components:

50 parts by weight Cyclohexanone,

50 parts by weight Glycerine,

5 parts by weight of the above-mentioned novolak resin, 0.5 parts by weight. Crystal violet (Schultz, color tables No. 785, p. 330).

The novolak resin of the lacquer bonded firmly to that on the surface of the aluminum backing Image layer while not adhering to the metallic non-image parts.

Then the coated half of the printing form was washed with water, dried and 20 minutes heated to 230 ° C., the background of the picture being covered with a 5% trisodium phosphate solution was removed.

The other half of the printing form remained unpainted and was not heated.

The two halves of the printing form were used for printing, and it was found that with the lacquered half 40 000 perfect prints could be obtained, while the unlacquered and half unheated after development gave only 30,000 perfect prints.

8. Find a solution

2.0 parts by weight of the condensation product

1 mole of 2,3,4-trihydroxy-benzophenone and 1 mole of naphthoquinone- (1,2) -diazide- (2) -5-sulfochloride and

120 vol. Ethylene glycol monomethyl ether

was applied to the mechanically roughened surface of an aluminum foil and dried. In in the manner described in Example 1, a printing form was produced, with a 2% trisodium phosphate solution was used. The printing form was cut in half. One half was coated with the novolak resin solution given in Example 7 above. That Resin bonded firmly to the surface of the printing form at the image areas, but it did not adhere on the picture background. After washing the coated printing form half with water, it became dried and then heated to 240 ° C for 20 minutes. The resulting soiling of the picture background was developed with trisodium phosphate solution

11 12

far away. The unpainted half became completely the same as the non-image parts, the copper layer Subject to heating. With the painted half that was removed and the bare aluminum emerged.

The printing plate received 40,000 perfect prints. The image side was then rinsed off with water, with

are, however, wiped over 2% phosphoric acid with the unpainted half and dried,

only 5000. 5 With the bimetal printing form obtained in this way, a

9. A higher print run produced according to the information in Example 1 was obtained than with a print light-sensitive offset printing plate material form in the same way, but with omission was exposed under an original, developed and heated.

wiped off with 10% phosphoric acid. For a better 15 to 20. There was one printing form after the The areas to be corrected were made visible in Examples 3 to 8, but this was done for then colored with a black paint. The removal of the by heating on the image sub-printing plate was dried, then with a ground-down coating instead of water for precoated offset printing plates in Haneriger trisodium phosphate solution 3% aqueous fluid Corrected the corrective agent and reused the hydrochloric acid. The results obtained with treated with dilute phosphoric acid. 15 results were similar to the results of Examples 3

After the up to 8th

Printing form was evenly gummed and then dried 21 to 26. After each printing form had been net, the color was produced with a commercially available example 3 to 8, but the lent, petrol-containing washout tincture was carefully removed by the Heat washed off the picture underneath. Thereafter, the rubber coating was removed by washing it off with water instead of water. The plate of trisodium phosphate solution, 5% aqueous boron, was then treated with 10% phosphoric acid and hydrofluoric acid was used (HBF ₄ ).
dried. The results obtained were similar to those heated to 240 ° C for 20 minutes. According to the results of Examples 3 to 8.
The printing forme was cooled down as in Example 1. One surface of several plates was given further treatment. The printing plate of stainless steel thus produced were treated with pumice and Wasergab significantly more prints than one in the same _S he abraded, then showered with water produced by way but rinsed after washing of distilled water and with a warm gum unheated printing form. Airflow dried. The surfaces cleaned in this way

10. to 12. Example 8 was repeated three times, 30 were coated with the coating described in Example 1, but was used as the photosensitive substance of the processing solution with a photosensitive layer of / S-naphthol ester of 1,2-naphthoquinone-diazide- (l) - about 2 g / m ² provided. The thus obtained printing plate carboxylic acid (3) or the N-methylanilide of the material was, as indicated in Example 1, exposed to 2, l-naphthoquinonediazide (2) sulfonic acid (5) or and developed.

the n-dodecilamide of the 2,1-naphthoquinonediazide 35

(2) -sulfonic acid- (5) used. The printed y _on ^ _6n plates obtained became a

forms behaved similarly to those in Example 8 _Λ ",. ,,. "™ ,,"

described printing form according to the invention. Heated to 260 ° C for ^{10 minutes, another}

13. For the production of printing forms for the 5 minutes heated to 345 ° C and still multicolor printing process was according to Example 1 4 ° ^eme other

procedure. It was heated to 345 ° C for 2 minutes while exposing the dye,
Extract templates for printing forms for red, yellow, blue,

Made black and white. The heating of the printing forms deposited on the picture background took place at 260 ° C. for 15 minutes. In all three cases, a 5% tridden surface was used Printing forms were wiped off in a multicolor printing 45 sodium phosphate solution without this machine printed a cellulose triacetate film, and the image of the cleaning agent used could be used 60,000 flawless color prints were obtained.

will. The resistance of the image on the printing formes thus obtained with, in the printing forms, to solvents from other production, however, the heating did not take place, 5 ° handle was then tested with a paint remover, which, on the other hand, could only be 12,000 perfect prints was composed as follows:
getting produced.

14. A 30 parts by weight provided with a copper layer. Ethylene glycol monomethyl ether,
Aluminum foil 3 was _{15 wt} aliumhydroxyd on copper surface _ _TK,

coated with a solution, the composition of which is 55 “ο, - τ, ™, ·, i-j

tion is described in Example 1 above. After the ³ ' ^{8 wt} - " ^T · polyvinylpyrrolidone,

Drying of the layer gave a presensitivity 5.1 parts by weight. Xylene,

sated bimetal plate. 0.03 part by weight Thymol blue,

It was exposed under a slide and with

5% trisodium phosphate solution developed. The 60 and to be regarded as a very aggressive paint remover

Image appeared in pale yellow tint on red is. The image areas were tested with the

Copper substrate. The plate was sprinkled with 2.5% stripping agent and the solvent droplets

Phosphoric acid wiped over, dried, stand in an oven for two minutes on the drizzled spot-

Heated to 240 ° C for 20 minutes, then left to cool. After that, the printing form surface became

len cleaned with 5% sodium phosphate solution, wiped with 65 with a water-dampened cotton ball

Rinsed with water and then dried. The slide and rubbed. In each of the three cases it was found that

was then in a ferric chloride solution of 35, the image on the printing form by the loading

up to 41 ° Be done and left in it until the paint stripper has dripped into it

13 14

had been. From this fact, the above-described test method can be considered suitable for

conclude that the printing forms for printing contain printing with aggressive solvents -

with printing inks are suitable, which components the printing inks.

with a very high dissolving power. The fi-

Another of the developed printing forms was 5 xed images proved to be, among other things, against di-

For 30 seconds in an oven heated to 460 ° C methylformamide as resistant, which is one of the

did. This printing form also turned out to be the most powerful organic solvent.

Claims (1)

1 2 Claims: Printing were delivering. The correction agents are usually 1. Process for the production of an offset printing - alkaline or acidic aqueous solutions, which sometimes form a presensitized printing plate, also contain a certain amount of organic solvent material, which is dissolved or emulsified on a metallic substrate. Only when a photosensitive layer has at least one ester in which a printing form with a clean image background and photosensitive substance is present is it ready for printing,
or an amide of an O-naphthoquinonediazide. From German patent specification 1 180 869 it is besulfonic acid or an O-naphthoquinonediazide, a printing form that already has a clean carboxylic acid and possibly a novolak or image background, is contained before it is used for a resol , whereby one treats the light-sensitive io printing with a reinforcing varnish, exposing sensitive layer under an original, which in order to reinforce its image areas. The exposed areas of the layer applied by developing varnish were dried by heating. In doing so, and removing a clean, water-bearing printing form from the printing forms obtained with the development or through any other post-treatment known hitherto known, one has created an understandable image background and then by evidently in each case a printing form whose image heats the color-bearing image areas hardens, because the background is first of all clean from printing stains characterized by the fact that one was after ken, protected from contamination of the image background creating the clean, water-bearing image and the post-treatment is never carried out in a background in the presence of a novolak and / or which must lead to the formation of a coating on or a rosol, the printing form on a temperature 20 the image background, which heats the printing ink temperature of at least 180 ° C, which assumes. The temperature level and the duration of the heating are selected in this way that by decomposing the color-fed and practically applied procedures Resulting image areas are reflected on what- offset printing forms, with which one can get high print runs The leading image background is created, and 25 prints can be made. Still the then by a follow-up treatment, in turn, desire for a substantial further increase creates a clean, water-bearing image background that can be printed in perfect quality. location. The known printing forms for the second method according to claim 1, thereby printing with printing inks that are used as solvents or indicates that the novolak or the resole used as a binding agent constituents of high dissolving power the heating in the form of an optionally emul- contained, not usable, so that also in this gated solution is applied. Regarding an improvement was particularly desirable with regard to printing on art Fabric surfaces that usually use 35 of printing inks with a strong dissolving effect. The invention relates to a method for manufacturing the object of the invention is to provide a method for len to create an offset printing form from a presensitizing production of offset printing forms, the th printing plate material, which is on a base when using the advantageous esters or amides of metal, in particular of aluminum or zinc, of naphthoquinonediazide sulfonic acids or -carboneins light-sensitive layer carries, in which than 40 acids compared to known processes a larger photosensitive substance an ester or amide of an edition of the prints, especially when used Naphthoquinonediazide sulfonic acid or a naphtha of printing inks with a strong dissolving effect for orthoquinonediazidecarboxylic acid and, indeed, not necessary substances, made possible. The solution to this digerweise, but still preferably, also a task is carried out with a method for manufacturing alkaline solution contains soluble resin. 45 of an offset printing form from a presensitized One such photosensitive material is made of the printing plate material, which is on a metallic German patent specification 854 890 known. In order to have a light-sensitive layer on a layer support, Printing form to come from usable life. in which as a photosensitive substance at least one if you have it after exposure under a template ester or an amide of an O-naphthoquinone and before or after removing the exposed stel-5 ° diazide sulfonic acid or an O-naphthochionodiazidene with an aqueous alkaline developer solution carboxylic acid and optionally a novolak or a heated to higher temperatures, whereby the remaining resole is contained, whereby one is the photosensitive one remaining disregarded diazo compound decomposed and exposed layer under an original, which exposed the decomposition product is firmly attached to the substrate. The layer is removed by developing, with is bound. 55 to developing or by post-treatment. German Patent 1,195,166 shows a clean, water-bearing image background known material described above, which creates and then by heating the ink-carrying however also novolak hardens in the photosensitive image areas, which is characterized by Layer contains. The remaining image that will be printed from the - that one after the creation of the clean, water-sensitive The printing form made from the material adheres without eroding the image background in the presence of a Novohitzcn firmly on the base. laks and / or a resol the printing forms on a According to the method described above, he temperature of at least 180 ° C heated, the after exposure and development, the printing for- height of the temperature and the heating time are kept in such a way that which in most cases still require correction, that is, by decomposing the color-bearing are necessary because at the edge or in small areas within the image there is precipitation on the water-bearing half of the image background of the printing form the layer image background is created, and then one through a or residues of the layer have remained, which after-treatment in turn creates a clean, water-based printing ink and thus creates an unclean leading image background.