Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Thermoplastic heating efficiency is a rather complicated problem to make it heat evenly due to the low thermal conductivity of thermoplastics. The heat required for plasticization of plastics comes from two aspects, namely, heat conduction of the barrel wall (external heat, the main part) and internal friction heat between plastics (internal heat). The heat source for melting and plasticization of plastics in plunger injection machines mostly relies on external heating of the barrel. The movement of plastics in the injection machine is driven by the plunger, with almost no mixing effect. The shear friction heat generated by the plastic during movement is quite small, which is not conducive to heat conduction.
If the initial temperature of the plastic entering the barrel is set to T0, and the maximum temperature reached by the inner wall of the barrel after the heater heats the barrel is Tw, then (Tw-T0) is the maximum temperature rise that the plastic can reach, but in fact, the plastic can only rise to a certain temperature T lower than Tw from the feed port to the nozzle (Tw£¾T£¾T0), so the actual temperature rise of the plastic should be (T-T0).
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