Extruder control system

• US 3,357,049 A
• Filed: 12/20/1965
• Issued: 12/12/1967
• Est. Priority Date: 12/18/1964
• Status: Expired due to Term

• Current Assignee: Wolfgang Spindler
• Original Assignee: Wolfgang Spindler
• Inventors: WOLFGANG SPINDLER
• Application Number:
  US04/515,027
• Time in Patent Office: 722 Days
• US Class Current: 425/146
• CPC Class Codes: B29B 7/423 and oscillating axially in general B01F31/401
• CPC Class Codes: B29B 7/726 Measuring properties of mixture, e.g. temperature or density B29B7/724 takes precedence
• CPC Class Codes: B29B 7/728 Measuring data of the driving system, e.g. torque, speed, power, vibration B29B7/724 takes precedence
• CPC Class Codes: B29C 2948/92019 Pressure
• CPC Class Codes: B29C 2948/92095 Angular velocity
• CPC Class Codes: B29C 2948/92876 Feeding, melting, plasticising or pumping zones, e.g. the melt itself
• CPC Class Codes: B29C 2948/92904 Die; Nozzle zone
• CPC Class Codes: B29C 2948/92952 Drive section, e.g. gearbox, motor or drive fluids
• CPC Class Codes: B29C 45/50 Axially movable screw
• CPC Class Codes: B29C 48/03 characterised by the shape of the extruded material at extrusion
• CPC Class Codes: B29C 48/92 Measuring, controlling or regulating

Claims

1. A SYSTEM FOR CONTROLLING THE FLOW OF MOLTEN PLASTIC THROUGH THE DIE OPENING OF AN EXTRUDER, (1) THE EXTRUDER COMPRISING (A) AN ELONGATED CYLINDRICAL HOUSING HAVING A FEED HOPPER AT ONE END AND AN EXTRUSION DIE WITH AN OPENING AT THE OTHER END, AND (B) AN AXIALLY RECIPROCABLE, ROTATABLE SCREW MOUNTED IN THE HOUSING, A TORPEDO CARRIED BY ONE END OF THE SCREW, A FIXED RING ARRANGED NEAR THE OTHER END OF THE HOUSING, THE RING AND THE TORPEDO DEFINING A CONSTRICTED ANNULAR PASSAGE OF A DIAMETER VARYING WITH THE AXIAL POSITION