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Extruder for producing molten plastic materials

  • US 20050047267A1
  • Filed: 10/11/2002
  • Published: 03/03/2005
  • Est. Priority Date: 10/12/2001
  • Status: Active Grant
First Claim
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1. Extruder for producing melts from commercially available granulated plastics by heating and milling the granules by means of heated single-screw or twin-screw extruders, for carrying out condensation polymerization or polymerization by using a section (6) of the extruder that is designed as a multi-screw extruder, with the use of evacuated chambers for removing low-molecular-weight constituents and/or blowing agents or the like, for obtaining larger molecules and thus higher viscosities, and for increasing the mechanical strength of the plastic produced from the melt, wherein, at least in the polycondensation zone of the multi-screw extruder section (6), the envelopes of the screw shafts (7) are spaced apart from each other, from the extruder screw (4) and its shaft section (10), and from the cylindrical zones surrounding them by a distance that is greater than or equal to zero (3 0).

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