DE851460C - Process for the direct production of right-sided font negatives or reversed or right-sided positives without photographic reproduction - Google Patents

Description

Process for the direct production of right-sided font negatives or reversed or reversed positives without photographic reproduction In order to obtain slides for the offset or gravure printing, one must .den Put the text in lead like in letterpress printing. From this pleading either Neatly trimmed prints made on art paper and using a prism reproduced or on transparent films made of cellulose hydrate, cellulose nitrate or Plastics printed. The prints need to have some 'copyable coverage be dusted with finely ground bronze or soot. Because of this Powdering and, last but not least, by copying the wrong way round (writing is the right way round) the sharpness of the typeface is adversely affected. Especially for hairlines this circumstance becomes unfavorable 1 -, e-noticeable through under-radiation. Another Possibility of making typesets usable for offset and gravure printing. Is that you make prints in letterpress on baryta paper. Again, this is just complicated through Method of obtaining a copied, reversed slide.

The aim of the new process is to produce every photographic reproduction can be completely switched off via a lens and at the same time really well covered, copyable, right-sided negatives hzw. reversed positives in direct operation obtain. The process works with a light-sensitive silver salt layer transparent paper, celluloid, plastic, etc. All manipulations for making of the negative or the Positive can be in subdued daylight are executed.

For this purpose, the usual typesetting in direct printing prints made on the photosensitive material described above with printing ink. These prints are then perfect in a rapid winder. blackened. The exact temperature of the developer and the development time play a role here no significant role. After developing, the film is briefly rinsed off and washed off with an ordinary paint solvent. The printing ink dissolves here of the printed areas. These places, that would leave developers inaccessible now appear white and are completely cleared in a normal fixer. After soaking and drying, the film can be copied. In this procedure, achieved the greatest possible sharpness of the typeface.

However, the aim is to create reversed positives in one operation then you first press the lift of the counterpressure of the extraction press. To The material to be printed, the counterpressure layer, is applied to this print run and reprinted. With the latter print run, the typeface is transferred from the lift. of the counter pressure on the photosensitive material. These so printed Foils are now put in the fixer first. After fixing and soaking it is as above washed off with detergent. This will remove the printed and therefore the fixer unreached areas exposed and blackened in the subsequent development.

A second type of direct production of reversed or right-sided The positive is as follows: The pre-exposed and blackened by development Material is now printed directly or indirectly, as described above. After this Print., The unprinted areas with an appropriate etching liquid, Sulfuric acid with potassium dichromate, etc., freed from silver and clarified. After this With the process, there is no need to wash off the paint.

All of these procedures are used in addition to the chemicals available on the market only specially prepared paper or film material is used. Advantages of the Procedure: i. unconditional sharpness of the typeface; 2. completely covered, haze-free Negative or positive, which no follow-up treatment, be it by weakening or Retouching, need; 3. All operations can be carried out in subdued daylight will; an exact C) awakening is thereby possible; 4. by switching off photographic recording and darkroom can produce the negatives or Positive, done in the shortest possible time; 5. The ease of use promises great Economy and consistent quality; even misprints on the photosensitive Material does not render this unusable; the printing ink can be washed off and the Foil can be reused.

As a template for the production of the font negatives ibzw. Positive can of course also one by offset, lithography or gravure printing as well as typewriter Produced fonts, possibly images and drawings, can be used without any the way of working needs to be changed.

Claims (1)

PATENT CLAIM: i. Process for the direct production of right-sided Negative or reversed writing positives from the typesetting or similar without photographic reproduction, characterized by direct or indirect Printing on transparent, photosensitive material using paint or similar Paste and subsequent treatment in developer or fixer or vice versa and Wash out the printed color between the two bath treatments. z. procedure according to claim i, characterized by printing on transparent, photosensitive Material that has been blackened by exposure and development, and removal of the silver in the unprinted areas. 3. The method according to claim i, characterized by direct pressure on opaque, photosensitive material for the purpose subsequent photographic enlargement or reduction of the resulting correct-sided negative typeface.