Process for producing a coated, biaxially oriented polyolefin film and the resultingproduct

Claim 1

A PROCESS FOR PRODUCING A COATED, BIAXIALLY ORIENTED, HEAT-SHRINKABLE POLYOLEFIN FILM, SAID COATING BEING STRONGLY ADHERENT TO THE BASE SHEET UNDER WATER WET CONDITIONS, WHICH COMPRISES, IN COMBINATION, THE STEPS OF (A) PASSING A BIAXIALLY ORIENTED, HEAT-SHRINKABLE POLYOLEFIN FILM THROUGH A FLAME EMANATING FROM THE DISCHARGE OPENING OF A BURNER SUPPLIED WITH A GASEOUS MIXTURE OF A HYDROCARBON FUEL AND OXYGEN-ENRICHED AIR, SAID FUEL BEING SELECTED FROM THE GROUP OF HYDROCARBONS CONSISTING OF PARAFFINIC AND OLEFINIC HYDROCARBONS, THE FUEL EQUIVALENCE RATIO FRACTION OF SAID GASEOUS MIXTURE SUPPLIED TO THE BURNER BEING BETWEEN 0.85 AND 1.15, THE OXYGEN RATIO OF SAID GASEOUS MIXTURE BEING BETWEEN 0.25 AND 0.30, THE PATH OF THE FILM AS IT TRAVERSES THE FLAME FROM THE BURNER BEING LOCATED AT A DISTANCE FROM THE BURNER OPENING LESS THAN THE LENGTH OF THE UNIMPEDED PRIMARY ENVELOPE OF THE FLAME BUT NOT LESS THAN THE DISTANCE BELOW WHICH THE VELOCITY OF THE BURNING GASES ESCAPING FROM THE IMMEDIATE VICINITY OF SAID DISCHARGE OPENING EXCEEDS THE BURNING VELOCITY OF THE FLAME, THE SURFACE ON WHICH SAID FILM IS SUPPORTED AS SAID FILM TRAVERSES THE FLAME BEING HEATED AND MAINTAINED AT A TEMPERATURE NOT ABOVE 40*C., THE