Method of manufacture of sheets and of the thermoplastics by means of a die with a wide slot and of the die with a wide slot for the implementation of the process

摘要

976,575. Extrusion machines. DYNAPLASTIK-WERK G.m.b.H. March 29, 1961 [March 30, 1960], No. 11544/61. Heading B5A. In a method of extruding thermoplastic material in sheet form by means of an extrusion machine having an elongated feed duct communicating with an elongated extrusion slot the flow of material through the feed duct towards the slot has superimposed thereon concomitant oppositely directed distributive movements along the longitudinal axis of the feed duct, whereby the material is distributed towards both ends of the slot. As shown in the machine illustrated inlet ducts 4 supply thermoplastic material to a feed duct 2 wherein a worm 5 rotates about its own axis 6 and in planetary movement about the axis 10 of the feed duct 2. Formed on the worm 5 are pairs of oppositely handed threads 11, 12 so that the thermoplastic material is distributed towards both ends of an extrusion slot 3. A pair of diametrically opposed worms may be used (Fig. 3, not shown).