| 摘要 |
Extrusion-die system comprising an extrusion slit (3) fed upstream by two flows of polymeric materials, one of which issues from one or several flat conduits (7,8), the other from a multitude of small holes (18) drilled into a bar element of generally T-shaped cross-section (5). The cross-section of element (5) has a punch-like configuration with the holes being fashioned therein in two parallel rows and being staggered from one row to the other. The die system permits manufacture of products comprising a network of threads or filaments sheathed in a film or foil. |
