Patent ID: 7240689
Filing Date: 2007-07-10
Classification: B29B,B29C,Y10T

Abstract:
1. A mixing head for mixing at least one polyol component and at least one isocyanate component and optionally, additives, to form a polyurethane reaction mixture, the mixing head comprising: a cylindrical mixing chamber having peripherally arranged thereon at least two inlet nozzles for the components; a control slide means movable in the mixing chamber in an axial direction between a first (front) position and a second (rear) position having arranged on the periphery thereof one or more grooves, the control slide means arranged so as to permit the components to enter the grooves through the inlet nozzles, flow through the grooves and exit the grooves through outlets when the control slide means is in the first (front) position and to enter the mixing chamber through the inlet nozzles when the control slide means is in the (second) rear position; an outlet channel connected downstream of the mixing chamber and arranged at an angle of between about 40° and about 140° with respect to the mixing chamber; and a cleaning slide means movable in the outlet channel in the axial direction, wherein the diameter, D, of the mixing chamber is larger by a factor of about 1.1 to about 5 than the breadth, B, of a projected surface of an outlet opening leading out of the mixing chamber into the outlet channel.