Relief printing

The Photopolymer Plate, a water developable photopolymer relief printing master plate made by modification of polyvinyl alcohol with urea group oligomer having a functional polyvinyl base, for making paper mold and matrix for printing master plates, has characteristics which are very close to those of the conventionally etched metal relief printing plates and has some superior points to them. 

Std 23 320 Coating high-relief printing of textured products... 

This is a relief printing process in which the image areas are raised above the level of the non-image areas and transferred from the inked printing plate to the metal surface by means of an intermediate resilient rubber surface. 

Relief—print area is raised above the non-print area—letterpress, flexography, dry offset letterpress, hot die stamping. 

Hydroxypropyl methacrylate/methy1 aerylate/methy1 methacrylate terpolymers and phthalic acid/trimethylol-propane copolymers were grafted with IBM by Rosenkranz et al. (22,23). These polymers, when formulated with 2-tert-butylanthraquinone, are irradiated with UV light to give insoluble coatings useful in the manufacture of printed circuits and relief printing plates. 

Relief printing (1875) n. Process utilizing those portions of the matrix which are in relief for taking ink from a supply roller and transferring it to the surface to be printed. 

Wood engraving (1816) n. A relief printing surface consisting of a wooden block with a usually pictorial design cut in the end grain. 

Letterpress Printing The process used for paper is adapted to plastics by the use of special inks and transfer rolls, and possibly a modification of press speed, flexible printing plates are usually employed, made of vinyl or rubber. It is the oldest method of printing flat plastic substrates and uses a press for relief printing from metal type or raised surfaces formed from wood, metal, or linoleum. (Printing ink manual, 5th edn. Leach RH, Pierce RJ, Hickman EP, Mackenzie MJ, Smith HG (eds). Blueprint, New York, 1993)... 

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