Thermosetting plastic injection molding using a screw or a plunger of the barrel polymer through a heated (120 ～ 260 ° F) in order to reduce viscosity, then into the mould heated in (300 - 450 ° F). Once the material is filled in the mold, pressing. The chemical crosslinking, the polymer hardens. Hard (i.e. curing) products while heat from the die top out, it cannot be molded or melting.
  Injection molding equipment with a closed mold injection device driven by hydraulic clamping device and a conveying material. The majority of the thermosetting plastic is used in granular or flaky, by a gravity hopper into the screw injection device. When processing polyester bulk molding compounds (BMC), it is like "bread", with a feeding piston material is pressed into the thread groove.
  Polymer this process is (arrangement according to the dosage size); phenolic plastics, polyester bulk molding compounds, melamine, epoxy resin, urea-formaldehyde plastics, vinyl ester polymer and the adjacent benzene two formic acid diallyl phthalate (DAP).
  The majority of the thermosetting plastic contains a lot of filler (up to 70% by weight), in order to reduce the cost and improve the performance of low shrinkage, increase the strength or special performance. Common fillers include glass fiber, mineral fiber, clay, wood fiber and carbon black. The fillings can be very abrasive, and has high viscosity, they must be overcome for processing equipment.

Process
  Thermoplastic and thermosetting plastic heating will reduce viscosity. However, the thermosetting plastic viscosity is varying with time and temperature increased, this is because of the chemical cross-linking reaction. The comprehensive results of these is the role of viscosity with time and temperature and the U curve. In the lowest viscosity area filling mold operation which is thermoset injection molding, because this material forming mold shape to the required pressure is the lowest. It also helps to damage to the polymer fibers in the lowest.
  The barrel of injection molding process using a screw to make the material flow through a heated, barrel with water or oil circulation in the cylinder jacket around the. The screw can be designed according to different types of each material, slightly compressed to remove the air and heating material with low viscosity. Most of the flow of thermosetting materials here are very good.
  Make the material into the mold operation is aborted the rotation of the screw and the screw speed towards the front hydraulic, the low viscosity plastic material is pressed into a mould. This rapid flow requirements in 0.5 seconds