Method of manufacturing a mold in the form of a multiple-impressionplastic plate for reproducing intaglio printing plates and plant for implementation thereof

Abstract From the Canadian patent

The impressions are produced using an original plate by the following steps:, a) a plastic plate made of deformable material is prepared, b) the said plate is placed in an adjusted position corresponding to the location of the first impression to be produced, between an original engraved plate and a high-frequency electrode , c) the first impression is produced on the plastic plate by compressing the latter and subjecting it simultaneously, for a given period of time to, high-frequency heating by means of an electrode d) the plastic plate is then cooled, e) the original plate and the electrode are separated from the plastic plate and relative displacement is effected between, on the one …