公开(公告)号：DE3210978A1

公开(公告)日：1983-09-29

申请号：DE3210978

申请日：1982-03-25

Applicant: BASF AG

Inventor： THIELE HEINO DIPL ING DR ,  ZETTLER HANS DIETER DIPL ING ,  SCHLUETER KLAUS DIPL ING ,  WALLNER JOSEF ,  WEBER WERNER DIPL ING DR ,  SEID BERNHARD DIPL ING

IPC: B29C65/00 ,  B01F11/00 ,  B01F15/00 ,  B29B7/00 ,  B29B7/08 ,  B29B7/22 ,  B29B7/28 ,  B29B7/34 ,  B29B7/74 ,  B29B7/76 ,  B29B9/00 ,  B29C53/00 ,  B29C65/48 ,  B29C65/70 ,  B29B1/06 ,  B29D27/02

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.