Apparatus for the manufacture of filaments or othe

专利名称：Apparatus for the manufacture of filaments

or other shaped structures fromthermoplasts

发明人：SCHLACHTER HANS,KUNZE OSKAR申请号：US2951060申请日：19600516公开号：US3090992A公开日：19630528

摘要： A melt extrusion apparatus for the manufacture of shaped products or such asfilaments and films of thermoplastic polymeric material comprises a hopper 1 from whichthe material in particulate form is fed to a screw extruder and is forced by the rotatingscrew 2 of the extruder towards a buffer space 6 communicating by means of ducts 7 withthe suction side of two metering pumps 8 which feed the molten material under pressurethrough ducts 9 to extrusion nozzles 10. The casing 3 of the extruder is provided with acooling jacket 4 and heating collars 5. The screw 2 is driven by the infinitely variablespeed power transmission gear 19 through pinion 20, gear-wheel 12, shaft 13 and splinedcoupling 11. Shaft 13 having gear-wheel 12 fixedly mounted thereon and the screw 2 areaxially displaceable and the pinion 20 is of such length that the gear-wheel 12 throughoutits entire range of axial travel remains in engagement with the pinion. A hydraulic liquid issupplied at a constant predetermined pressure to a cylinder 14a containing a piston 14the rod 15 of which is coaxial with shaft 13 and in contact with one end thereof. The speedcontrol lever 18 of the infinitely variable gear 19 is connected by means of link 16 andarm 16a with the piston rod 15 in such a manner that the rate of rotation of the screw 2

increases progressively as the screw moves axially from left to right and projects furtherand further into the buffer space 6. Thus, when the rate of feed of material by the screwbecomes too small, the consequent axial movement of the screw from left to rightautomatically increases the rate of feed of material by the screw. Conversely, when therate of feed of material by the screw to the metering pumps becomes excessive, the rateof rotation of the screw is automatically decreased. The predetermined axial pressuremay be applied to the extruder screw by means of compressed air or pre-tensionedsprings instead of hydraulically. The apparatus automatically maintains constant thepressure on the material between the discharge end of the extruder and the meteringpumps, thereby promoting uniformity of the rate of delivery of materials by the pumps.

申请人：FARBWERKE HOECHST AKTIENGESELLSCHAFT VORMALS MEISTER LUCIUS &BRUNING

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