US 4,767,694 AGranted

Method of preparing a blanket with reserved spaces utilizing photocopying procedure

AssigneeMAN Roland Druckmaschinen AG

InventorJohannes M. Schubert

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Abstract

The invention relates to a method of preparing a varnish blanket. Instead of a proof being used for pre-location of required varnish-free zones on a blanket for blanked-out in-line varnishing in rotary presses, the zones required not to be varnished are transferred by means of a reference copy, and after physico-chemical pretreatment adapted to the surface properties of the blanket, to a blanket stuck to a support plate. In addition to polyvinyl alcohol copying layers or coatings sensitized by bichromate, wipe-on copying layers sensitized by diazo salts are suitable, a positive or negative original being copied by direct contact in known manner onto a blanket thus pretreated. The zones required not to be varnished can therefore be preformed by cutting out the top layer of the blanket.

Claims21

Dependent claims

A method for preparing a blanket for in-line varnishing with dispersion varnishes on an aqueous base or in association with UV-varnish-resistant blankets for the application of low-viscosity UV-varnish in rotary offset presses, comprising:

(a) pretreating a blanket suitable for offset printing to increase the adherence of a photo-sensitive copying layer to said blanket,
(b) applying a photo-sensitive copying layer to the surface of said blanket,
(c) forming a reference copy on said blanket by exposing a positive or negative original which is in contact with said photo-sensitive copying layer,
(d) removing the top layer of the unexposed portion of said blanket which is not to receive varnish, whereby said method provides for the pre-location of varnish-free areas prior to mounting said blanket on a rotary offset press, and said pre-location allows the simultaneous mounting and alignment of said blanket and a printing plate on said rotary offset press relative to each other and to the varnish recipient.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/948,332Filed 31 Dec 1986
Priority: DE 360091815 Jan 1986
Granted: 30 Aug 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B41N 10/02
Blankets or like coverings; Coverings for wipers for intaglio printing: blanket structure
B41M 7/0045
After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock: using protective coatings or film…
Y10S 430/152
Radiation imagery chemistry: process, composition, or product thereof: making camera copy, e.g. mechanical negative
B41N
Printing plates or foils