The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1976
Filed:
Feb. 16, 1973
Rotger Mitgau, Essen-Kupferdreh, DT;
Bruno Petrik, Essen, DT;
Dietmar Schedlitzki, Niederwenigern, DT;
Th. Goldschmidt AG, , DT;
Abstract
A process for making carrier sheets of paper, treated with aqueous solutions of heat-hardenable, aminoplast condensation resins, such as, the reaction products of melamine, urea, thiourea, and like aminoplast constituents with formaldheyde, in which the treated sheet is stretched, as by passing it over broad-drawing rollers while it is in a warm-deformable condition (at a temperature between about 80.degree. to 130.degree.C), transversely with respect to the grain of the paper and, if desired, longitudinally with respect to the grain of the paper, and the treated stretched sheet is then cooled to a temperature of about 30.degree.C by blowing with air or passing the same over cooling rollers. The treated sheet may be stretched after it has passed through a heated drying channel, to dry and procondense the heat-hardenable aminoplast condensation resin, and before the temperature has dropped below that at which the sheet is no longer in a warm-deformable condition or the sheet may be cooled after passage through the heated drying channel and then reheated to a warm-deformable condition. The treated, stretched sheets of the present invention are pressed on wood panels in a heated hydraulic press and preferably in a heated short-cycle press.