Impingement mixing of liquids in reaction injection molding

Reaction injection molding (RIM) requires the mixing of two prepolymers that will react to form the polymer part molded in situ. An important operation in the sequence of steps that make up RIM is the homogeneous mixing of the two (or more) viscous liquids. In many RIM applications, the preferred mixing route is direct jet-to-jet impingement of the reactant streams. Fluid velocity measurements have been obtained under a variety of conditions to …