Abstract: A composite compensator sleeve (3), designed specifically to compensate for the dimensional difference that exists between a rotational drive carrier (1) and a printing forme (2), the outer face (2b) of which forms a flexographic plate, which sleeve comprises, fastened to one another, so as to be unable to undergo any rotational and translational movement relative to the others, from the inside outward: a tubular nickel-based metal internal base (5), providing the cylindrical inner face (3a) of said compensator sleeve, the thickness of which is between 0.1 and 0.25 mm, and is obtained by electroplating; an external layer (6) of a hard elastomer material, providing the outer face (3b) of said compensator sleeve; and an intermediate layer (7) of a soft elastomer material, placed between the metal internal base (5) and the hard external layer (6).

Abstract: The present invention relates to the production by electroforming of perforated frames used especially to form flat or cylindrical printing frames. According to the invention, the procedure is in two stages, with two separate electrochemical baths, the second bath comprising a pyridinium compound of general formula: ##STR1## in which: R is an optionally substituted alkyl chain,R' is a hydrogen atom or a substituent group in any position relative to the nitrogen atom of the pyridinium nucleus.