Mixing apparatus for multi-component plastics, especially polyurethane

US4486102A · kind A · utility

Assignee

• BASF SE

Inventors

• Heino Thiele · Ludwigshafen, DE
• Werner Weber · Munich, DE
• Hans D. Zettler · Havelsee, DE
• Klaus Schlueter · Naila, DE
• Josef Wallner · Holzkirchen, DE
• Bernhard Seid · Bischofswerda, DE

Key dates

• Filing date: Mar 23, 1983
• Grant date: Dec 4, 1984
• Expiry date: Mar 23, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2105/16
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A mixing head for multicomponent plastics, especially polyurethane, in whose mixing chamber (2) a hollow piston (7) can be moved to and fro to control the component streams. The hollow piston contains an expulsion piston (8), which is movable independently of the hollow piston, and which can be passed through an outlet tube (3) which adjoins the outlet orifice (4). The end face (12) of the hollow piston forms, together with the mixing chamber wall (11) nearest the sprue, a shearing gap in which the components are mixed. As a result of the design and arrangement of the pistons (7) and (8), good mixing is achievable even under critical conditions, and the mixing chamber is also easily cleaned.