Th. Goldschmidt Ag

Rotger Mitgau

Dietmar Schedlitzki

Bruno Petrik

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.

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Essen-Kupferdreh, Germany

Rotger Mitgau