Patent ID: 8691132
Filing Date: 2014-04-08
Classification: B29C,Y10T

Abstract:
1. A method for treating stretch film and applying a pattern thereto, the method comprising: passing a web of oriented thin polymer film across at least one heated roller; the at least one heated roller being hotter than the web; the at least one heated roller having the pattern engraved on a surface thereof so as to define face regions and relief regions on the surface, with the face regions and relief regions collectively conforming to the pattern; so that as the web contacts the surface of the at least one roller, portions of the web positioned over the relief regions receive relatively less heat from the at least one roller than portions of the web positioned over the face regions of the at least one roller; thereby causing the respective portions of the web to undergo differential, heat induced shrinkage whereby the differential heat-induced shrinkage imparts the pattern to the thin polymer film.