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US 3,942,440 AGranted
Method of making a printing form
OwnerGerhard Ritzerfeldinventor
Life of this patent
Estimating the term…
Abstract
A printing form is made by heating a foil of synthetic thermoplastic material and embossing one surface thereof with a plurality of spaced depressions, with the resulting formation at the opposite surface of a corresponding plurality of protuberances.
Claims38
A method of making a printing form comprising the steps of providing an embossable foil;
- embossing the foil to form a multiplicity of depressions in one surface which are distributed over said one surface and similarly distributed protuberances which project from the opposite surface of the foil;
- placing the free ends of said protuberances in contact with an abutment face;
- differentially heating said foil in accordance with a predetermined pattern and thereby causing differential softening of the foil in accordance with said pattern;
- and applying to said protuberances a uniform pressure causing at least partial flattening of the protuberances in at least one softened region of said foil to form on said other surface a replica of said predetermined pattern, whereby the foil is converted into a relief printing form.
1 more element
Dependencies are inferred from the claim text.