Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1978-11-07
1981-03-17
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264544, 264175, 264280, 264294, D01D 512
Patent
active
042566878
ABSTRACT:
A process for producing molded articles, such as cups, which comprises passing a crystalline polyolefin resin melt in sheet form through between rolls having a specified surface roughness and temperature while simultaneously contacting both faces of the resin melt with the rolls respectively, followed by still contacting at least one of the faces with the roll or other similar rolls to solidify the resin melt thereby obtaining a sheet having a specified surface roughness on each face, further passing the sheet through between at least one pair of rolls rotating in the direction opposite to each other and having therebetween a gap smaller than the thickness of the sheet while maintaining the sheet at lower than the crystalline melting point thereof thereby to obtain a rolled sheet and then molding the rolled sheet under pressure while maintaining the rolled sheet at specifically lower than the crystalline melting point thereof thereby to obtain the molded articles.
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Inoue Takashi
Mori Shohji
Yazaki Katsuya
Nippon Petrochemicals Co. Ltd.
Woo Jay H.
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