Stock material or miscellaneous articles – Hollow or container type article – Nonself-supporting tubular film or bag
Patent
1997-10-03
2000-07-25
Kiliman, Leszek
Stock material or miscellaneous articles
Hollow or container type article
Nonself-supporting tubular film or bag
428 354, 428 366, 428 367, 428419, 4284747, 428480, 428500, 428515, 428520, 264241, 264314, 264320, 264322, 264327, 220640, 220453, B29D 2200
Patent
active
06093462&
ABSTRACT:
Inherently low orientation sheet is produced by extruding a thermoplastic material in its melt phase onto the surface of a chill roller and thereafter solidifying the sheet at a relatively slow chill rate. Importantly, the just extruded thermoplastic polymeric sheet (i.e., the melt) is urged into continuous surface-to-surface contact with the chill roll by a curtain of air impinging upon the sheet at a velocity sufficient to ensure such continuous surface-to-surface contact between the sheet and the chill roll, but insufficient to impart substantial stress to the sheet. In such a manner, therefore, the resulting sheet will exhibit a low inherent internal stress level as evidenced by an unusually low shrink rate (ASTM D-1204) of less than about 18%. The sheets of the present invention are thus especially characterized by such unusually low shrink rates, and hence unusually low inherent internal stress levels which find particular utility as containers for the packaging industry--especially containers produced by melt-phase deep-draw thermoforming techniques.
REFERENCES:
patent: 4404162 (1983-09-01), Miki et al.
patent: 4836764 (1989-06-01), Parkinson
patent: 4997691 (1991-03-01), Parkinson
patent: 5091231 (1992-02-01), Parkinson
ASTM Designation: D-1204, "Standard Test Method for Linear Dimensional Changes of Nonrigid Thermoplastic Sheeting or Film at Elevated Temperature", 1994.
O'Herron Michael R.
Wright George R.
Kiliman Leszek
Questech Packaging Inc.
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