Hot runner heating methods
Hot runner system can be classified by heating method:outer heating,inner heating and heat insulation. Outer heating is the widely used. Another classification is by the transfer method of melting plastic.For single tip nozzle, it do not have manifold. It will replace the locating ring and main sprue bush. The single tip nozzle can be direct gate, pin point gate and valve gate nozzle. To use pin point gate nozzle or valve gate nozzle would be better. If using cold runner system, the plastic material which is freezing in the main sprue, will increase the cycle time. And there will be also some indent and bubbles in the rear of the sprue gate. It is suitable for the material that in wide range of melting temperature,just like PE plastic material. For multi point injection .It is widely used for large plastic parts. The scale of flowing travel and wall thickness is very large. In order to reduce the press loss in the period of injection , and avoid increasing the wall thickness. This method can keep good press transfer in pressure holding period.It can simplify the two plate mould and reduce the injection cycle, avoiding waste material and making mould to automotive.
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