Foam sheet with pressure-sensitive adhesive coating and method of making same

Claim 1

IN MAKING A RESILIENT FOAM SHEET WITH A COATING PRESSURE-SENSITIVE ADHSEIVE ON ONE SURFACE THEREOF, THE METHOD COMPRISING PROVIDING A COVER SHEET WITH A RELEASE SURFACE, FEEDING SAID COVER SHEET AND A SECOND COVER SHEET ALONG PATHS WHICH CONVERGE TO FORM THEREBETWEEN A CROTCH TERMINATING IN A METERING SLIT AND THENCE CONTINUE THROUGH A FOAMING REGION, FEEDING A MIXTURE OF MATERIALS WHICH TOGETHER PRODUCE FOAM WITH A MICROPOROUS SURFACE THROUGH SAID SLIT BETWEEN SAID COVER SHEETS AND IN CONTACT WITH SAID RELEASE SURFACE BEFORE SUBSTANTIAL FOAMING TAKES PLACE, FOAMING SAID FOAM SHEET IN CONTACT WITH SAID RELEASE SURFACE AND IN THE ABSENCE OF SUBSTANTIAL PRESSURE, CURING THE FOAM SHEET BETWEEN THE COVER SHEETS, STRIPPING AWAY THE COVER SHEET FROM THE FOAM SHEET, PROVIDING A RELEASE SHEET HAVING A COATING OF PRESSURESENSITIVE ADHESIVE, LAMINATING THE FOAM SURFACE EXPOSED BY REMOVAL OF SAID COVER SHEET TO THE PRESSURE-SENSITIVE ADHESIVE, AND STRIPPING AWAY THE RELEASE SHEET FROM THE ADHESIVE, WHEREBY A FOAM SHEET IS FORMED WITH A MICROPOROUS SURFACE COATED SUBSTANTIALLY ENTIRELY AND DIRECTLY ON SAID SURFACE WITH A TACKY, PRESSURE-SENSITIVE ADHESIVE.