Oriented films of ethylene polymers

Claim 1

A PROCESS FOR PRODUCING A HEAT-SHRINKABLE SHEET STRUCTURE WHICH CONSISTS OF THE SEQUENTIAL STEEPS OF FORMING A SELF-SUPPORTING, UNORIENTED SHEET FROM A HOMOGENEOUS BLEND OF (1) FROM 70% TO 85% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE BLEND, OF A LOW DENSITY POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, AND COPOLYMERS OF ETHYLENE WITH OLEFINICALLY UNSATURATED MONOMERS COPOLYMERIZABLE THEREWITH, SAID POLYMER HAVING A DENSITY WITHIN THE RANGE OF 0.91 TO 0.93 GRAM/CC. AT 25*C. AND (2) FROM 30% TO 15% BY WEIGHT OF A HIGH DENSITY LINEAR POLYMER SELECTED FROM THE GROUP CONSISTING OF LINEAR POLYETHYLENE AND LINEAR COPOLYMERS OF ETHYLENE WITH OLEFINICALLY UNSATURATED MONOMERS COPOLYMERIZABLE THEREWITH TO FORM LINEAR COPOLYMERS, SAID HIGH DENSITY LINEAR POLYMER HAVING A DENSITY WITHIN THE RANGE OF 0.94 TO 0.98 GRAM/CC. AT 25*C.; STRETCHING SAID SHEET IN EACH OF TWO MUTUALLY PERPENDICULAR DIRECTIONS IN THE PLANE OF THE SHEET TO AT LEAST THREE TIMES THE ORIGINAL DIMENSION OF THE SHEET IN EACH DIRECTION AT A TEMPERATURE BETWEEN ABOUT 95*C. TO ABOUT 115*C. AND THEREFORE COOLING SAID SHEET.