A device for extruding multi-layer long products made of thermoplastic plastics.

摘要

The apparatus comprises at least two extruders (2) and (3) for the materials, an entry block (4) having channels (7), a co-extrusion block (5) and an exit nozzle tool (6). The co-extrusion block (5) has a lamination channel (8) connected to the tool (6) and supplied by control channels (9) provided with control members (10) for the various material streams. One of a set of distribution blocks (12) is interchangeably interposed between the entry block (4) and the co-extrusion block (5), each block (12) containing feed channels (13) registering with the entry channels (7) and distribution channels (14) registering with the control channels (9), the connection passages between the feed channels (13) and the distribution channels (14) differing from one distribution block to another, thereby enabling ribbons with different lamination patterns to be produced. Each block may comprise a stack of interchangeable plates, in which are formed the passages which connect the channels (13) (14). IMAGE