Process for making shrink film comprising rapidly-quenched semi-crystalline polyamide
作者： Richard M. Dayrit , Roger D. Vrooman , Nathanael R. Miranda , Frank M. Hofmeister , Christopher K. Robinson
DOI:
关键词: Quenching 、 Volume percent 、 Die (manufacturing) 、 Polyamide 、 Materials science 、 Die swell 、 Solid-state 、 Composite material
摘要: As a first aspect, the present invention is directed to process for making heat-shrinkable annular film, comprising: (A) extruding an extrudate downward from die; (B) quenching by applying liquid extrudate; (C) reheating orientation temperature of 130° F. 210° F., resulting in reheated and (D) orienting while solid state, being carried out with total factor at least 2, so that oriented, film has free shrink 185° 10 percent. The comprises one semi-crystalline polyamide selected group consisting of: (i) 6, (ii) 66, (iii) 6/66, (iv) 6/12. makes up 5 volume percent extrudate. At 50% cascades down distance 2 inches. initial contact within 0.1 8 inches die.
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