Stereotype mat

Claim 1

THE METHOD OF MAKING A STEREOTYPE MAT WHICH COMPRISES APPLYING ONTO A PRINTING FROM A RELATIVELY MOIST PAPERBOARD MAT HAVING A MOISTURE CONTENT IN THE RANGE FROM 10 TO 40 PERCENT BY WEIGHT AND A MULTI-PLY BACKING SUPERIMPOSED THEREON, SAID BACKING COMPRISING A MOLDABLE SHEET CONTAINIG A PLURALITY OF PLICES OF CREPED TISSUE HAVING AN UNSET THERMOSETTING RESIN DISPERSED THEREIN, THE RESIN CIONTENT IN SAID BACKING SHEET CONSTITUTING FROM 15 TO 75 PERCENT BY WEIGHT OF SAID SHEET ON A DRY BASIS, SAID BACKING SHEET HAVING A VOLATILE CONTENT IN THE RANGE FROM 5 TO 15 PERCENT BY WEIGHT ON A BONE DRY BASIS, APPLYING SUFFICIENT PRESSURE TO THE RESULTING ASSEMBLE TO FORM AN IMPRESSION OF THE PRINTING AREAS OF SAIID PRINTING FORM INTO SAID MAT, REMOVING SAIID ASSEMBLE FROM SAID PRINTING FORM, DRYING SAID BACKING AND SAID MAT WHILE APPLYING A REDUCED PRESSURE AT THE REAR OF SAID BACKING SO THAT THE MOISTURE IN SSID MAT IS VENTED THROUGH SAID BACKING, AND HEATING SAID MAT AND SAID BACKING UNDER CONDITIONS SUFFICIENT TO CURE THE RESIN IN SAID BACKING TO WITHSTAND THE PRESSURES ENCOUNTERED IN STEREOTYPE CASTING.

Claim 2

THE METHOD OF MAKING A STEREOTYPE MAT WHICH COMPRISES APPLYING ONTO A PRINTING FROM A RELATIVELY MOIST PAPERBOARD MAT HAVING A MOISTURE CONTENT IN THE RANGE FROM 10 TO 40 PERCENT BY WEIGHT AND A MULTI-PLY BACKING SUPERIMPOSED THEREON, SAID BACKING COMPRISING A MOLDABLE SHEET CONTAINIG A PLURALITY OF PLICES OF CREPED TISSUE HAVING AN UNSET THERMOSETTING RESIN DISPERSED THEREIN, THE RESIN CIONTENT IN SAID BACKING SHEET CONSTITUTING FROM 15 TO 75 PERCENT BY WEIGHT OF SAID SHEET ON A DRY BASIS, SAID BACKING SHEET HAVING A VOLATILE CONTENT IN THE RANGE FROM 5 TO 15 PERCENT BY WEIGHT ON A BONE DRY BASIS, APPLYING SUFFICIENT PRESSURE TO THE RESULTING ASSEMBLE TO FORM AN IMPRESSION OF THE PRINTING AREAS OF SAIID PRINTING FORM INTO SAID MAT, REMOVING SAIID ASSEMBLE FROM SAID PRINTING FORM, DRYING SAID BACKING AND SAID MAT WHILE APPLYING A REDUCED PRESSURE AT THE REAR OF SAID BACKING SO THAT THE MOISTURE IN SSID MAT IS VENTED THROUGH SAID BACKING, AND HEATING SAID MAT AND SAID BACKING UNDER CONDITIONS SUFFICIENT TO CURE THE RESIN IN SAID BACKING TO WITHSTAND THE PRESSURES ENCOUNTERED IN STEREOTYPE CASTING.