| 摘要 |
A method and apparatus for extrusion of flat or tubular films from thermoplastic material is described. Improvements concern equalisation of the lateral distribution of the flow velocity achieved in combination with elimination in part or in full of die-lines formed at interfaces where part flows join each other. The improvement involves the provision of edges of the ends of die-walls which separate the part-flows from one another being slanted to form a lateral displacement over the length of said edge, or are provided with screw shaped vanes. |
