| 摘要 |
<p>A pressure plate is provided with corresponding cone for use with an extruder. The plate comprises twin worms/screws which may be tangential or intermeshed, co-rotating or counter-rotating. The plate has sets of a plurality of substantially coaxial circular of polygonal slits or openings that are either tangential to each other or intermesh into one another. Each slit is provided with at least one supporting rib member. The plate and cone are arranged such that the open cross-sectional area continuously decreases from the exit of the plate to the exit of the cone, leading to one or more die orifices. Also provided is a process for manufacture of bars extruded from an extruder using such a plate, as well as an installation for manufacture of such bars. The bars may comprise surfactant and typically such bars have reduced cracking and mushing tendencies.</p> |
