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    Process for the production of polypropylene films
    2.
    发明授权
    Process for the production of polypropylene films 失效
    生产聚丙烯薄膜的方法

    公开(公告)号：US5716570A

    公开(公告)日：1998-02-10

    申请号：US641637

    申请日：1996-05-02

    申请人： Herbert Peiffer ,  Gunter Schlogl ,  Karl-Heinz Kochem ,  Detlef Busch ,  Robert Schmidt

    发明人： Herbert Peiffer ,  Gunter Schlogl ,  Karl-Heinz Kochem ,  Detlef Busch ,  Robert Schmidt

    IPC分类号： B29C47/06 ,  B29C47/04 ,  B29C47/14 ,  B29C55/12 ,  B29C69/00 ,  B29K23/00 ,  B29L7/00 ,  B29L9/00 ,  B29C47/16 ,  B29C55/14

    CPC分类号： B29C47/062 ,  B29C47/0019 ,  B29C47/0021 ,  B29C47/003

    摘要： A process for the production of biaxially oriented polypropylene films which include at least one layer is described, in which a propylene polymer B is heated in an extruder and the melt of the propylene polymer B is extruded through a flat sheet die and the melt emerging from the flat sheet die is taken off on one or more rolls and is solidified to give a prefilm and this prefilm is stretched in the longitudinal and transverse direction. A propylene polymer or a propylene polymer mixture A is heated and melted in a second extruder and the melt of the propylene polymer or of the propylene polymer mixture A is fed to the two sides of the propylene polymer melt B so that both melts are extruded together and simultaneously through the flat sheet die. The propylene polymer or the propylene polymer mixture A forms the edge region of the film during the production process, and the edge regions including the propylene polymer or the propylene polymer mixture A are cut off after the longitudinal and transverse stretching of the film.

    摘要翻译： 描述了一种生产包含至少一层的双轴取向聚丙烯薄膜的方法，其中丙烯聚合物B在挤出机中加热，丙烯聚合物B的熔体通过平板模头挤出，熔体从 将平片模具在一个或多个辊上取下并固化以得到预制件，并且该预制件在纵向和横向上被拉伸。 将丙烯聚合物或丙烯聚合物混合物A在第二挤出机中加热和熔融，并将丙烯聚合物或丙烯聚合物混合物A的熔体进料到丙烯聚合物熔体B的两侧，使得两个熔体被挤出在一起 并同时通过平板模具。 丙烯聚合物或丙烯聚合物混合物A在制造过程中形成膜的边缘区域，并且包括丙烯聚合物或丙烯聚合物混合物A的边缘区域在膜的纵向和横向拉伸之后被切断。