DD213530A1 - METHOD OF FORMING MANUFACTURE WITH THE HELP OF A LASER - Google Patents

Abstract

The method of printing plate production by means of a laser is used in the polygraphic technique. It can thus both relief printing plates as well as planographic printing plates with improved quality can be produced. The object of the invention is to allow the laser radiation necessary for the production of the printing forms to penetrate unhindered to the reaction site. This is done by using spectral sensitization of the chemical reaction to use sensitizers which, after initiating the desired reaction, lose their absorbency.

Description

Procedure for printing aura-curing bit of 'laser. '-.- j. '..'. '' '· -

The invention relates to the production of; .. Printing plates "for den'Hoch"", · and lithographic printing» ^{^..:} . '. . "''';". :

The. different .ferfaJaren the '

are generally based on the light-initiated pfe ssikalischecla ^ chemiscieii Eigensdhaften copy layers or Ätsmarken "thereby get. '' in .zunehmendem-,":

Measures "Laser as Light Sources" It is possible to measure the frequency of a very good "A &paesuag" of the wavelength _: the material to be used produces a very fast laser absorption It is also not possible to use the "good" photosensitivity of laser beams to the most materials used for the "BFmokforming" setting "in visible skin sensitizers. -Deutteilig is .dabei the. ·.! Fact that. because of the high extinction duroh .-., the v.er " _: '.- · applied dyes the' irradiated light almost, full; constantly'.on the surface .the.cooperative- absorbed-;. '

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by laser-resistant with 'spectral sensitization'

mixed reaction is initiated *

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this way reaction on the surface of the copying came the light, as a result of

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the sensitizer itself at the

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Reason of·. Liofctabsorptioaj carried _f optionally in conjunction with the action of Luftsaueretoff "It is also possible the layer material Substansen such" as peroxides zuausetsetij, or the iniziieren the Absorptionaänderung at elevated Temperature ^ »speed.

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, Bei ^ el I _n 'on a © anodized Alujainiumplattθ with a Oocidsohichtdic ^ e of 8 / ^ a 20 m thick Polyvinylalkoholsöfeicht is fiw with a content of 10 GW ^ Xironbrillantrot | applied 4B "HD" This layer is a Rait A ^ gonlaser at 1 W "Auegangleistung with a beam diameter of 2O ₁ ^ tm and a pulse duration of 60 ^, * irradiated spotwise.This results in a pointwise increase in temperature, which continues homogeneously in the layer depth.With a teflon temperature of 540 K loses the Be a dye

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Absorbency. At the irradiated points, a permanent hydrophobization is achieved.

Example 2: On an anodized aluminum plate with an oxide layer thickness of Qytnm. a 20 % strength polyvinyl alcohol layer containing 5 μg of acid anthraquinone ruby 2G is irradiated. This layer is irradiated on an argon laser with a beam spot diameter of 20 μm and a Sap length of 3 OyHi pointwise. In the subsequent development with water, the layer was completely detached from the base. In a second Tersueh 2 gw ->% benzoyl ρeroxid were additionally added to the layer material. In this case, the irradiated sites remained firmly attached to the pad after development.

Claims (1)

Process for the production of printing plates for relief and planographic printing! by laser irradiation of spectral sensitizer-added transducers, characterized in that substances which change their absorption curves upon irradiation are used as spectral sensitizers Method according to point that the absorption change has the absorption maximum length or may be reduced · 1, characterized by a shift in respect of its proximity to the absorption Process for the production of printing plates for relief printing and planographic printing by laser irradiation of layers offset with spectral sensitizers according to 1 and 2, characterized in that substances are added to the layer which initiate or accelerate the change of the absorption capacity upon irradiation.