| 摘要 |
<p>An extrusion die head for incorporating at least one layer with stripes of contrasting colour supported by a homogeneous base layer and/or covered by a transparent layer is assembled from four components of which one is a prismatic member which can be displaced longitudinally and replaced by another, to vary the pattern by which the contrasting feed materials are incorporated into the final extrudate relative to the positions of input stream couplings. Choke screens can adjust the flow rate of individual streams passing through.</p> |
