| 摘要 |
<p>The invention relates to a device for joining together at least two material flows in a laminar coextrusion machine comprising at least two extruders, more precisely as many extruders as layers of different materials used, a device for joining together the flows coming from the extruders into a so-called global flow, said device being also called distribution box and, an extrusion head supplied by the global flow. The joining device comprises a main channel (6) wherein arrive annexe channels called supplied channels conveying the different material flows coming from the extruders, said channels being provided with means for restricting the flow passage cross-section. The device is characterized in that the supply channel connecting each extruder to the main channel is made at least partially in a cylindrical plug valve (9) comprising means (10) which transforms a cylindrical reed into a planar sheet.</p> |
