Apparatus for removing volatile constituents contained in liquid synthetic plastic melts

• US 3,217,783 A
• Filed: 12/12/1962
• Issued: 11/16/1965
• Est. Priority Date: 12/22/1961
• Status: Expired due to Term

• Current Assignee: Wolf Rodenacker
• Original Assignee: Wolf Rodenacker
• Inventors: WOLF RODENACKER
• Application Number:
  US04/244,211
• Time in Patent Office: 1,070 Days
• US Class Current: 159/2.2
• CPC Class Codes: B29B 13/06 by drying B29B13/08 takes precedence ; drying moulded articles or half products B29C37/0092
• CPC Class Codes: B29B 7/845 Venting, degassing or removing evaporated components in devices with rotary stirrers
• CPC Class Codes: B29B 7/86 for working at sub- or superatmospheric pressure B01F33/70 takes precedence
• CPC Class Codes: B29C 2948/92019 Pressure
• CPC Class Codes: B29C 2948/92466 Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
• CPC Class Codes: B29C 2948/9259 Angular velocity
• CPC Class Codes: B29C 2948/92866 Inlet shaft or slot, e.g. passive hopper; Injector, e.g. injector nozzle on barrel
• CPC Class Codes: B29C 2948/92876 Feeding, melting, plasticising or pumping zones, e.g. the melt itself
• CPC Class Codes: B29C 2948/92885 Screw or gear
• CPC Class Codes: B29C 2948/92961 Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
• CPC Class Codes: B29C 48/03 characterised by the shape of the extruded material at extrusion
• CPC Class Codes: B29C 48/29 in liquid form
• CPC Class Codes: B29C 48/37 Gear pumps
• CPC Class Codes: B29C 48/387 using a screw extruder and a gear pump
• CPC Class Codes: B29C 48/395 using screws surrounded by a cooperating barrel, e.g. single screw extruders
• CPC Class Codes: B29C 48/76 Venting , drying means; Degassing means
• CPC Class Codes: B29C 48/763 Vent constructions, e.g. venting means avoiding melt escape
• CPC Class Codes: B29C 48/766 in screw extruders
• CPC Class Codes: B29C 48/92 Measuring, controlling or regulating
• CPC Class Codes: C08G 69/46 Post-polymerisation treatment

Claims

1. AN APPARTUS FOR REMOVING VOLATILE COMPONENTS FROM LIQUID PLASTIC MELTS BY VACUUM TREATMENT, WHICH COMPRISES:

(A) AN EVACUATION CHAMBER HAVING AN INLET FOR THE INTRODUCTION OF LIQUID PLASTIC MELT, AN OUTLET FOR THE REMOVAL OF DEVOLATIZED PLASTIC PRODUCT, AND AN EVACUATION APERTURE, SAID EVCUATION APERTURE BEING DEFINED BY THE ADJACENT PERIPHERAL EDGES OF A CUT-OFF PORTION OF SAID EVACUTION CHAMBER, AID EVACUATION CHAMBER BEING SUBSTANTIALLY CYLINDRICAL AND VERTICALLY DISPOSED, AND AT LEAST ONE OF THE EDGES OF SAID EVACUATION APERTURE BEING SHARPLY BEVELED TO PREVENT THE ADHESION OF PLASTIC MELT THERETO TO THE FLOW OF SAID MELT BEING DOWNWARD, AND ONE EDGE OF SAID EVACUATION APERTURE BEING A LOWER EDGE WHICH IS FLARED OUTWARD TO CAPTURE SAID DOWNWARD FLOWING MELT;

(B) A ROTATABLE WORM FOR TRANSFERING THE PLASTIC MELT DOWNWARDLY FROM THE INLET OF THE EVACUATION CHAMBER, PAST THE EVACUATION APERTURE THEREOF, AND TO THE OUTLET OF SAID CHAMBER, SAID WORM BEING DISPOSED WITHIN SAID CHAMBER AND HAVING EDGES WHICH ARE IN WIPING CONTACT WITH THE WALLS THEREOF;

(C) AN EVACUABLE ENCLOSURE SURROUNDING THE EVACUATION APERTURE IN SAID EVACUATION CHAMBER AND IN COMMUNICATION THEREWITH, SAID ENCLOSURE HAVING MEANS FOR CONNECTION TO A VACUUM SOURCE FOR THE REMOVAL OF SAID VOLATILE COMPONENTS;

(D) MEANS FOR ROTATING SAID WORN WHEREBY WHEN SAID ENCLOSURE AND EVACUATION CHAMBER ARE EVACUATED, AND THE PLASTIC MELT IS TRANSFERRED DOWNWARD WITHIN SAID CHAMBER FROM THE INLET THEREOF, PAST THE EVACUATION APERTURE AND TO THE OUTLET, THE VOLATILE PRODUCTS IN SAID MELT ARE REMOVED AND A DEVOLATIZED PLASTIC PRODUCT IS DISCHARGED AT THE OUTLET OF SAID CHAMBER.