Impinging mixers combine and disperse resins within each other, and are often used in reaction injection molding (RIM).
High velocity results in a turbulent rather than a laminar flow.
[1][2] Thermosetting plastics cure by a chemical reaction between two resins.
The resins must be mixed immediately before they are injected into a mold.
As soon as the mixing chamber is full, a piston immediately pushes the mixed resin into the mold, leaving very little mixed resin curing outside the mold.