CONCENTRIC CO - EXTRUSION DIE AND A METHOD OF EXTRUDING A MULTILAYER THERMOPLASTIC FILM
    2.
    发明申请
    CONCENTRIC CO - EXTRUSION DIE AND A METHOD OF EXTRUDING A MULTILAYER THERMOPLASTIC FILM 审中-公开
    浓缩挤出机和一种挤出多层热塑性薄膜的方法

    公开(公告)号:WO2013011079A1

    公开(公告)日:2013-01-24

    申请号:PCT/EP2012/064140

    申请日:2012-07-19

    摘要: A large concentric co-extrusion die (1) is described having a plurality of annular or conical die mandrel layers (201-205). Each layer is formed between a pair of adjacent annular or conical die mandrels (101-106) defining between them a flow path for molten thermoplastics material from an inlet to an annular extrusion outlet (110) through which a thermoplastics tubular extrusion is formed in use. Extrusion takes place through the multiple annular layer outlets (301-305) to form a multi-layered product. At least one layer (203) of the annular or conical die mandrels has a plurality of molten material inlets arranged around the external circumference of the co-extrusion die with each inlet being connected to a feed channel (403) which has plural bifurcations (403.1, 403.2, 403.3) providing 2 n subsidiary outlet feed channels (503) where n is the number of bifurcations. Each subsidiary outlet feed channel being connected to a corresponding helical outlet channel (703).

    摘要翻译: 描述了具有多个环形或圆锥形模心层层(201-205)的大型同心共挤出模头(1)。 每个层形成在一对相邻的环形或圆锥形模心轴(101-106)之间,在它们之间形成用于从入口到环形挤出出口(110)的熔融热塑性材料的流动通道,在其中形成热塑性管状挤出物 。 通过多个环形层出口(301-305)进行挤出以形成多层产品。 环形或圆锥形模芯心轴的至少一层(203)具有围绕共挤出模头的外圆周布置的多个熔融材料入口,每个入口连接到具有多个分支(403.1)的进料通道(403) ,403.2,403.3),其提供2n个辅助出口馈送通道(503),其中n是分叉数。 每个辅助出口进料通道连接到相应的螺旋出口通道(703)。