专利内容由知识产权出版社提供
专利名称：Apparatus for manufacturing tubular
thermoplastic
发明人：David A. Verner,Henry A. Kipp申请号：US05/920686申请日：19780630公开号：US04201527A公开日：19800506
摘要：A variable size deflector disc directs cooling gas to the internal surfaces of atubular plastic film drawn between an extruder die and a pair of rollers. The discfacilitates the starting process for pulling a narrow diameter tubing from the extruderover the disc to the rollers. The plastic tub can then be readily enlarged to the finalmaximum diameter followed by expansion of the deflector disc to control the flow ofcooling gas. The disc is preferably in the form of an iris having a plurality of pivotableleaves which can be expanded outwardly from a contracted position. The outer edge ofthe leaves are designed to provide a relatively smooth rounded circumference of thevariable diameter disc throughout the variation in diameter between the minimum andmaximum tube dimensions for the tubular plastic film process. The expandable discpermits more efficient cooling and more rapid production of the plastic film.
申请人：EGAN MACHINERY
代理机构：Weingram & Klauber
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