公开(公告)号：US4874567A

公开(公告)日：1989-10-17

申请号：US42138

申请日：1987-04-24

申请人： George Lopatin ,  Larry Y. Yen ,  Randall R. Rogers

发明人： George Lopatin ,  Larry Y. Yen ,  Randall R. Rogers

IPC分类号： B32B5/24 ,  B01D67/00 ,  B01D71/26 ,  B29C67/20 ,  B29K23/00 ,  B29K105/04 ,  B29L7/00 ,  B32B27/12 ,  C08J5/18 ,  C08J9/28 ,  D01D5/24

CPC分类号： D01D5/24 ,  B01D67/003 ,  B01D69/08 ,  B01D71/26 ,  B32B27/12 ,  C08J9/28 ,  B01D2323/12 ,  C08J2201/0542

摘要： Microporous polypropylene membrane or hollow fibers is formed from a melt blend of 5 to 20 weight percent polypropylene and a solvent. The melt blend is shaped and cooled to effect solid phase separation of the polypropylene from the blend. The solvent is separated from the polypropylene by extraction and the porous polypropylene is dried under restraint to prevent shrinkage.

公开(公告)号：US4120141A

公开(公告)日：1978-10-17

申请号：US819529

申请日：1977-07-27

申请人： George Lopatin ,  Menachem Lewin

发明人： George Lopatin ,  Menachem Lewin

IPC分类号： D02G1/02

CPC分类号： D02G1/022

摘要： An improved process is provided for simultaneously drawing and false-twist texturing of partially oriented polyester yarn. The process is of the type wherein the yarn from a supply source is passed through a yarn feed system; a heating zone in which the yarn is heated to a temperature of from about 175.degree. to about 235.degree. C; a cooling zone in which the yarn is cooled to a temperature below about 80.degree. C; a false-twisting means; and take-up means whereby the yarn is drawn to a desired draw ratio; to winding up means; and is characterized in that the yarn emerging from said heating zone and before entering said cooling zone is passed through a heat-maintenance zone, in which the yarn is maintained at a temperature and for a time sufficient to permit substantially complete crystallization of the yarn so that the fully-drawn textured yarn product has a tenacity of at least 3.5 gram per denier. Apparatus for carrying out said improved process is also provided.

摘要翻译： 提供了一种改进的方法，用于同时拉伸和部分取向的聚酯纱线的假捻变形。 该方法是其中来自供应源的纱线通过喂纱系统的类型; 加热区，其中纱线被加热到约175℃至约235℃的温度; 将纱线冷却至低于约80℃的冷却区域; 假捻手段; 以及卷取装置，由此将纱线拉伸至所需的拉伸比; 清理手段; 其特征在于，从所述加热区域出来并在进入所述冷却区域之前的纱线通过热维持区域，其中纱线保持在足以允许纱线基本上完全结晶的温度和时间 完全拉伸的变形纱产品具有至少3.5克/旦尼尔的强度。 还提供了用于执行所述改进过程的装置。