Impinging mixer

Impinging mixers combine and disperse resins within each other, and are often used in reaction injection molding (RIM). Mixing occurs as two high velocity streams collide in a mixing chamber. High velocity results in a turbulent rather than a laminar flow.

Impingement mixing is most effective when it occurs at the center of the mixing chamber.[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. 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.[3]

References
  1. Cláudio António Pereira da Fonte (November 2012). "Mixing Studies with Impinging Jets" (PDF). European Federation of Chemical Engineering. Retrieved March 30, 2017.
  2. Fonte, Cláudio P.; Sultan, M. Ashar; Santos, Ricardo J.; Dias, Madalena M.; Lopes, José Carlos B. (2015). "Flow imbalance and Reynolds number impact on mixing in Confined Impinging Jets". Chemical Engineering Journal. 260: 316–330. doi:10.1016/j.cej.2014.08.090. ISSN 1385-8947.
  3. Tucker, Charles L.; Suh, Nam P. (1980). "Mixing for reaction injection molding. I. Impingement mixing of liquids". Polymer Engineering and Science. 20 (13): 875–886. doi:10.1002/pen.760201307. ISSN 0032-3888.
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