Extruder with integrated die plate and method for degasing polymer mixtures

US9023983B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Hanns-Ingolf Paul · Leverkusen, DE
• Udo Wiesner · Bornheim, DE
• Jörg Kirchhoff
• Thomas König · Nuremberg, DE
• Klemens Kohlgrüber · Lingen (Ems), DE

Key dates

• Filing date: Jul 22, 2011
• Grant date: May 5, 2015
• Expiry date: Jul 22, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2223/18
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to an extruder (10), particularly for extruding a synthetic rubber product, which comprises a barrel (24), one or several extruder elements (12, 14), particularly one or several extruder screws and/or a kneader elements (14), arranged inside the barrel (24) for conveying the product, optionally an inlet port for feeding a stripping agent into the barrel (24) and an outlet port for removing volatile compounds from the product and, where applicable, the stripping agent. According to the invention a perforated die plate (26) is fixed to the barrel (24) in flow direction before the outlet port. Since the die plate (26) is not fixed to the extruder elements (12, 14) but to the barrel (24) a circumferential clearance between the die plate (26) and the barrel (24) is prevented so that no extruded material is passing the die plate (26) radially outside. Parts of the extruded material comprising a low surface area to volume ratio are prevented so that the evaporation of volatile compounds is facilitated.