Apparatus for producing a mixture from two or more plastic components

US4505592A · kind A · utility

Assignee

• BASF SE

Inventors

• Jorg Ihbe · Gauting, DE
• Peter Taubenmann · Munich, DE
• Heino Thiele · Ludwigshafen, DE
• Hans D. Zettler · Havelsee, DE

Key dates

• Filing date: Nov 2, 1983
• Grant date: Mar 19, 1985
• Expiry date: Nov 2, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86815
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A mixing apparatus for multi-component plastics, in particular polyurethane, possesses a mixing chamber (2) with inlet apertures (3) and (4) for the individual plastic components and an outlet aperture (8) for the mixture. In the mixing chamber, a control element (5), which has the same cross-section as the chamber and possesses overflow channels (6) and (7), can be moved to and fro for controlling the component streams. In order to avoid pressure peaks or pressure surges in the transport of the components when the control element passes from the closed position to the mixing position and vice versa, and to provide improved accuracy of metering, the inlet apertures in the inner wall of the mixing chamber, and the corresponding areas of the shell of the control element between its end face (13) and the overflow channels, are matched with one another with regard to their size.