Cast plastic sheets or films

Claim 1

A METHOD OF FORMING A RE-INFORCED, POROUS, CAST AND GELLED FILM HAVING EXTRUDED REINFORCING STRAND-LIKE LINES, SAID FILM BEING FORMED OF A PLLYMERISED SYNTHETIC RESIN CAPABLE OF BEING GELLED, COMPRISING THE STEPS OF LAYING A SPREAD OF INDIVIDUALLY EXTRUDED SPACED FINE LINES OF A PASTE OF THE POLYMERISED SYNTHETIC RESIN THINNED BY A SOLVENT IN THE FORM OF AN OPENWORK PATTERN ON THE SURFACE OF A FLEXIBLE TRAVELING BAND CARRIER WITH THE SPREAD OF STRAND-LIKE FINE LINES EXTRUDING SIAGONALLY THEREOF, SUBJECTING THE PATTERN SPREAD OF LINES ON THE CARRIER TO A HEAT TREATMENT AT AN ELEVATED TEMPERATURE TO EVAPORATE-OFF THE THINNING SOLVENT BUT NOT TO GELL THE SAID SPREAD OF LINES, IMMEDIATELY CASTIN ON THE HEATED PATTERN SPREAD OF LINES ON THE CARRIER A FILM OF SOLVENT THINNED PASTE OF A COMPATIBLE POLYMERISED SYNTHETIC RESIN CAPABLE OF BEING GELLED AND WHICH PASTE INCLUDES A PORE-FORMING BLOWING AGENT ADAPTED TO BE BLOWN AT THE GELLING TERM -, PERATURE OF THE PASTE IN WHICH IT IS INCLUDED, IN SUCH A MANNER THAT SAID FILM EMBEDS THE PATTERNED SPREAD OF LINES AT LEAST TO A MAJOR PORTION OF THE THICKNESS IN DEPTH OF SAIDS, SUBJECTING THE RE-INFORCE FILM THUS FORMED TO ANOTHER HEAT TEMPERATURE TO EVAPORATE FILM THUS FORMED SOLVENT AND TO GELL THE FILM AND EMBEDDED PATTERN SPREAD OF LINES AND ALSO TO DECOMPOSE ANY BLOWING AGENT AND ALLOWING THE RE-INFORCED FILM TO COOL AND SET.

Claim 2

A METHOD OF FORMING A RE-INFORCED, POROUS, CAST AND GELLED FILM HAVING EXTRUDED REINFORCING STRAND-LIKE LINES, SAID FILM BEING FORMED OF A PLLYMERISED SYNTHETIC RESIN CAPABLE OF BEING GELLED, COMPRISING THE STEPS OF LAYING A SPREAD OF INDIVIDUALLY EXTRUDED SPACED FINE LINES OF A PASTE OF THE POLYMERISED SYNTHETIC RESIN THINNED BY A SOLVENT IN THE FORM OF AN OPENWORK PATTERN ON THE SURFACE OF A FLEXIBLE TRAVELING BAND CARRIER WITH THE SPREAD OF STRAND-LIKE FINE LINES EXTRUDING SIAGONALLY THEREOF, SUBJECTING THE PATTERN SPREAD OF LINES ON THE CARRIER TO A HEAT TREATMENT AT AN ELEVATED TEMPERATURE TO EVAPORATE-OFF THE THINNING SOLVENT BUT NOT TO GELL THE SAID SPREAD OF LINES, IMMEDIATELY CASTIN ON THE HEATED PATTERN SPREAD OF LINES ON THE CARRIER A FILM OF SOLVENT THINNED PASTE OF A COMPATIBLE POLYMERISED SYNTHETIC RESIN CAPABLE OF BEING GELLED AND WHICH PASTE INCLUDES A PORE-FORMING BLOWING AGENT ADAPTED TO BE BLOWN AT THE GELLING TERM -, PERATURE OF THE PASTE IN WHICH IT IS INCLUDED, IN SUCH A MANNER THAT SAID FILM EMBEDS THE PATTERNED SPREAD OF LINES AT LEAST TO A MAJOR PORTION OF THE THICKNESS IN DEPTH OF SAIDS, SUBJECTING THE RE-INFORCE FILM THUS FORMED TO ANOTHER HEAT TEMPERATURE TO EVAPORATE FILM THUS FORMED SOLVENT AND TO GELL THE FILM AND EMBEDDED PATTERN SPREAD OF LINES AND ALSO TO DECOMPOSE ANY BLOWING AGENT AND ALLOWING THE RE-INFORCED FILM TO COOL AND SET.