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December 14 2017 04:20:35 AM
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Seiki Valve & Spear System

Features of Seiki Valve & Spear System

This reliable runnerless molding system enables:
 • 100% of the resin to be processed in production
 • No secondary process required
 • More profits due to faster molding cycles
 • Better quality parts
 • Automated molding operation, eliminating human factor. (Reliability)

Eliminates problems of conventional hot runner systems. The Spear System has fundamentally solved all technical problems (resin leaking, gate clogging stringing, drooling, burning, gate balance, etc.) that a hot runner system must confront, because the principle is correct.
 • Applicable to most thermoplastic resin
 • Long service life and maintenance free
 • Varieties of models are available, covering part weight from 0.1g through several kg.

General Construction

The system consists of probes and a manifold that are assembled inside the mold. A controller maintains the temperature of these probes and manifold.


Seiki Spear Probe
The patented Spear System is a two stage probe consisting of a body heating element and a separate tip heating element. Various types of spear probes are available for a wide variety of molding applications.

 


The Principle of the TIP HEATER
An internal body heater maintains the melt temperature of resin around the probe. A separate tip heater turns “ON” to melt the gate open. Cooling holes near the gate areas always keep both the cavity and gate areas evenly cooled. When the tip heater turns “OFF”, the gate area is cooled down by heat transfer, and the resin in the gate area is rapidly solidified, sealing the gate.  

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