Key Processing Parameters Barrel temperatures determine the viscosity of the polymer. A higher temperature will lower the viscosity. This will allow it to flow easier. Although 80% of the melting comes from frictional heating from the rotation of the screw, the barrel temperatures can change the melt temperature over a limited rate.

Key Processing Parameters Mold temperature can determine surface appearance and affect packing of the part. Warmer mold temperatures give the polymer more time to pick up the mold detail before it cools. If the mold is cool enough, it could cool the molten polymer in the middle of the part and decrease the amount of compensation during the packing stage.

Key Processing Parameters Injection speed determines the amount of orientation in the part. If the speed is too fast, the frictional heating could become too high, increase the polymer temperature, and decrease the polymer's viscosity.

Key Processing Parameters Packing pressure compensates for the polymer shrinkage as it cools. A higher pressure will provide more compensation. If the pressure is too high, it could cause the parts to stick in the mold.

The cooling time determines the temperature of the part as it comes out of the tool. If it is too warm, there could be some unrestricted shrinkage in the part, which, in turn, could lead to warpage.

Process Advantages Provides high production rates particularly when using multi-cavity tools.

Capable of holding highest tolerances of any plastics processing method.

Tools equipped with hot runners have low scrap rates.