Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1993-02-02
1994-06-21
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
156 86, 156217, 264569, 264342R, 425 721, 4253261, B29C 5526, B29C 5528
Patent
active
053226640
ABSTRACT:
A method and apparatus is provided for forming clear shrinkable film material for use as labels on containers. A blend of general purpose polystryene and styrene-butadiene or styrene butyl acrylate is extruded from an annular extruder die orifice to form a frustoconical tube which is stretched before cooling air is applied to form a clear film that has machine direction orientation and cross direction orientation that can be used as a shrinkable label on containers. As the tube is extruded, it is shielded from cooling air which is applied downstream from the extruder die orifice. The apparatus shields the hot annular extruded material adjacent the die orifice. The air is supplied downstream from an annular air orifice which is designed with a taper that allows ambient air to be freely drawn in and eliminates what would be a negative pressure zone immediately downstream of the air orifice while eliminating air turbulence and improving cooling.
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Owens-Illinois Labels Inc.
Thurlow Jeffery
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