Basf Aktiengesellschaft

Gunter Wallbillich

John Lynch

Rudolf Vyvial

Herbert Naarmann

Gerhard Bleckmann

Gunther Schulz

Manfred Zurger

To close the gaps (6) which result between the end or edge sections (7) of the gravure printing plates (2) when the latter are clamped on form cylinders (1) of rotary gravure presses, the gap (6) is covered with a cover element (8) in which at least that surface region which lies on the end or edge sections (7) of the gravure printing plate (2) and covers the gap (6) is deformable under pressure and can therefore be matched up with the surface contour in the gap region, the cover element is pressed onto the surface of the gravure printing plate, the resulting gap cavity is filled with a curable filling compound and, when curing of the filling compound is complete, the cover element is removed. It is particularly advantageous to use cover elements which are in the form of hollow bodies and which are filled with a pressure-generating and pressure-transmitting medium, and the pressure exerted on the deformable surface of the cover element which lies on the gravure printing plate, and hence also the surface contour of the closed gap, can be controlled via the internal pressure in the cavity of the cover element.

Method for closing the gap between the ends of gravure printing plates

Photopolymerizable water-soluble or water-dispersible mixtures essentially consist of a base polymer, at least one polymerizable ethylenically unsaturated compound, at least one photoinitiator and/or photosensitizer and at least one stabilizer, the thermal polymerization inhibitor being a water-soluble salt of nitrous acid.

Photopolymerizable water-soluble or water-dispersible mixture containing

Photosensitive recording materials which are suitable for the production of printing plates and relief plates and possess a photopolymerizable relief-forming layer which can be developed with water and is based on a polyvinylalcohol/monomer mixture contain, as a binder in the said layer, a polyvinylalcohol derivative which is obtained by reacting polyvinylalcohol with an acylating agent which has groups which are polymerizable by free radicals, the reaction being carried out in the heterogeneous phase, in an aprotic dispersant, using the acylating agent in an amount which corresponds to not less than twice the molar amount required to achieve the desired degree of acylation.

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Schifferstadt, Germany

Gunter Wallbillich