Extrusion head for co-extruding multi-layer plates or films, comprises adapter to take separate molten flows over flexible separator into linked flow channels through adapter and jet to extrusion outflow gap

摘要

An extrusion head comprises an extruder jet, with a channel for the molten flow of thermoplastics to the outflow gap. A co-extrusion adapter carries the separate molten flows, with a flow channel linked to the jet channel. A flexible separator between the two feed channels divides the separate flows before they come into contact. The separator has comb slits in the extrusion direction. An extrusion head (1) comprises an extruder jet (2), with a channel (20) for the molten flow of thermoplastics to the outflow gap (21), to form multi-layered plates or films in the extrusion direction (A). A co-extrusion adapter (3) is fitted, with a flow channel (32) linked to the jet channel, to carry the separate molten flows. A flexible separator (4) is between the two neighboring feed channels (30,31) to divide the separate flows before they come into contact with each other in the flow channel, with automatic setting of the flow ratios. The separator has comb slits in the extrusion direction.