| 摘要 |
<PICT:0804821/IV (a)/1> An extruder-mulling device, e.g. for mixing colours with thermoplastic materials, e.g. nylon, and extruding films, comprises an extrusion screw 1, not mounted on thrust bearings, which with the extruder barrel 2 forms a channel in which the material is worked. The said channel, which is fed via the hopper 4 and a feeder screw, communicates, forward of the screw 1, with a zone 14 which is enclosed by a stationary housing member 7 and a die member 13, and is shaped to contain a conical nosepiece 10, the apex of which faces the screw 1 and is detachably but rigidly connected thereto by the shaft 11. In operation the rearward thrust of the screw 1 forces the conical surface of the nose-piece towards the corresponding surface on the housing and thus produces a mulling effect on the material therebetween which is then forced into the zone 14 and through the die outlet 15. The die itself is formed by the housing 7 and the die member 13, and has an outlet valve 19 which regulates the mulling pressure.
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