Extruder for plastics

• US 6,074,084 A
• Filed: 04/21/1998
• Issued: 06/13/2000
• Est. Priority Date: 10/21/1996
• Status: Expired due to Fees

• Current Assignee: Gefinex-Jackon GmbH (Jackon AS)
• Original Assignee: Gefinex-Jackson GmbH
• Inventors: Kolossow, Klaus Dieter
• Primary Examiner(s): SOOHOO, TONY GLEN
• Application Number:
  US09/063,575
• Time in Patent Office: 784 Days
• Field of Search: 366/79, 366/82, 366/83, 366/84, 366/85, 366/86, 366/144, 425/204, 425/208, 425/209
• US Class Current: 366/84
• CPC Class Codes: B29B 7/426 with consecutive casings or screws, e.g. for charging, discharging, mixing
• CPC Class Codes: B29B 7/485 with three or more shafts provided with screws
• CPC Class Codes: B29B 7/487 with consecutive casings or screws, e.g. for feeding, discharging, mixing
• CPC Class Codes: B29B 7/488 Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices discharging B29B7/582; feeding B29B7/60
• CPC Class Codes: B29B 7/489 Screws B29B7/482 takes precedence
• CPC Class Codes: B29B 7/726 Measuring properties of mixture, e.g. temperature or density B29B7/724 takes precedence
• CPC Class Codes: B29B 7/7414 with rotatable stirrer, e.g. using an intermeshing rotor-stator system B29B7/7423 takes precedence
• CPC Class Codes: B29B 7/823 Temperature control
• CPC Class Codes: B29B 7/826 Apparatus therefor
• CPC Class Codes: B29B 7/90 Fillers or reinforcements , e.g. fibres
• CPC Class Codes: B29B 7/92 Wood chips or wood fibres
• 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 48/297 at several locations, e.g. using several hoppers or using a separate additive feeding
• CPC Class Codes: B29C 48/387 using a screw extruder and a gear pump
• CPC Class Codes: B29C 48/40 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
• CPC Class Codes: B29C 48/435 Sub-screws
• CPC Class Codes: B29C 48/44 Planetary screws
• CPC Class Codes: B29K 2105/0005 containing compounding ingredients releasing, lubricating or separating agents B29C33/56, fibers B29K2105/08, B29K2105/12; fillers B29K2105/16, recycled material B29K2105/26

Abstract

An extruder comprising several zones, including at least a plasticizing and mixing zone, a residence, mixing and cooling zone, and a mixing and cooling zone being constructed as planetary-roller extruders, the zones being substantially shut off from one another by blisters, and being connected to one another via melt pipes and intermediate pumps.

Claims

1. A method for the foam extrusion of plastics with an extruder with the incorporation of additives and aerating agents, in particular with the supply of relatively high-viscosity or low-viscosity polymers via a lateral-arm extruder, and also cooling to unmoulding temperature and supply into a moulding tool, the extruder comprising:

multiple extruding zones;

a pump being connected between at least two zones;

at least one of the two zones connected by the pump is constructed as a planetary roller extruder section, said method comprising;

supplying granulated plastic to a zone of the extruder;

supplying additives and aerating compounds to another zone of the extruder;

pumping plastic between zones of the extruder;

pumping plastic through the planetary roller extruder section using the pump;

cooling the material; and

producing extruded plastic.