Materials and methods for the production of stereotype mats

Claim 1

A BACKING SHEET FOR PACKING A STEREOTYPE MAT CONSISTING ESSENTIALLY OF A WEB OF UNIVERSALLY STRETCHABLE PAPER OF ESSENTIALLY UNIFORM THICKNESS HAVING A MULTIPLICITY OF GATHERINGS WHICH ARE SUFFICIENTLY FINE TO AVOID FOLDING INTO MULTIPLE THICKNESSES WHEN THE SHEET IS APPLIED TO THE BACK OF A STEREOTYPE MAT AND COMPRESSED AS THE MAT IS MOLDED, SAID SHEET BEING INDENTED ON AT LEAST ONE SIDE THEREOF TO PROVIDE A SERIES OF UNIFORM PROTUBERANCES, SAID SHEET BEARING ON ONE INDENTED SURFACE THEREOF A UNIFORMLY DISTRIBUTED COATING OF A MOISTURE SENSITIVE ADHESIVE WHICH UNIFORMLY COVERS BOTH THE PROTUBERANCESAND THE AREAS OF THE SHEET BETWEEN SAID PROTUBERANCES, SAID SHEET BEING CHARACTERIZED BY RESIDENT GATHERINGS WHICH PERSIST AFTER INDENTATION AND UPON WHICH SAID PROTUBERANCES MAY COLLAPSE AS THE MAT AND BACKING ARE SUBJECTED TO MOLDING PRESSURE, WHEREBY THE SAID COLLAPSED AREAS WILL RETURN TO THE ORIGINAL UNIFORM THICKNESS OF THE SHEET.