Impinging mixers combine and disperse resins within each other, and are often used in
reaction injection molding
Reaction injection molding (RIM) is similar to injection molding except thermosetting polymers are used, which requires a curing reaction to occur within the mold.
Common items made via RIM include automotive bumpers, air spoilers, and fen ...
(RIM). Mixing occurs as two high velocity streams collide in a mixing chamber. High velocity results in a
turbulent
In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between t ...
rather than a laminar flow.
Impingement mixing is most effective when it occurs at the center of the mixing chamber.
cure by a chemical reaction between two resins. The resins must be mixed immediately before they are injected into a mold. The mixing can be done by impingement mixing, where two streams to collide at high velocity in a mixing chamber. 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.
References
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Injection molding