Injection Molding Process
- Closed Mold process
- The polymer is Mixed with very short reinforcing fibres (10-40%)
- Polymer-fibre mixture in form of pellets is fed through a hopper
- The material is then conveyed forward by a feeding screw and forced into a split mold, filling its cavity through a feeding system with sprue gate and runners.
- Reciprocating screw since it not only rotate but also moves forward and backward according to the steps of the molding cycle.
- It acts as a ram in the filling step
- Then it retracts backward in the molding step
- Heating element, placed over the barrel, soften and melt the polymer
- The mold is equipped with a cooling and solidification of the material.
Advantages of Injection Molding:
- Process can be fully automated
- High productivity & quality
- Low price
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