Process for the continuous production of rubber compounds in a twin-screw extruder

US5262111A · kind A · utility

Assignee

• Hermann Berstorff Maschinenbau GmbH · DE

Inventors

• Gerd Capelle · Langenhagen, DE
• Holger Schaarschmidt · Hannover, DE
• Dieter Mayer · Ludwigshafen, DE
• Markus Wolff · Großburgwedel, DE

Key dates

• Filing date: Sep 9, 1992
• Grant date: Nov 16, 1993
• Expiry date: Sep 9, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2321/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the continuous production of a rubber compound in a twin-screw extruder is disclosed that improves the dispersion of carbon black in the extrudate while reducing the specific energy requirements of the extrudate. Rubber is fed into the extruder together with a processing aid and masticated up to a temperature of 120.degree. C. to 180.degree. C. Subsequently, a first part of carbon black representing preferably 40% to 80% of the whole quantity of carbon black is fed into the heated extrudate. Afterwards, plasticizing oil is added to the extrudate before the second remaining carbon black part is fed and incorporated into the extrudate at a temperature of 120.degree. C. to 180.degree. C. The whole compound is then cooled, a crosslinking agent is added, and the compound is homogenized and extruded.