Plastics Processing

Hot Runner with Servomotor for Moulding Efficiency

03/09/2012 | Autor / Editor: Kathrin Schäfer / Jürgen Schreier

Polypropylene collecting tubes—metering chambers for laboratory analysis—weighing 1.06 g are moulded in just 5.8 seconds with direct injection.
Polypropylene collecting tubes—metering chambers for laboratory analysis—weighing 1.06 g are moulded in just 5.8 seconds with direct injection.

Hot runner engineering influences the design, construction, efficiency and costs of heavy-duty injection moulding tools. At Medtec, in an exhibit at the Arburg stand, Günther Heisskanaltechnik presents an efficient hot runner system with electrically driven valve-gate nozzles that meets the most stringent clean-room requirements.

The hot runner is a 16-cavity tool for producing collecting tubes—that is, metering chambers for laboratory analysis. The items, moulded from polypropylene, weigh 1.06 g and are produced in just 5.8 seconds on the electric Arburg 520 A Allrounder moulding machine with direct injection. The hot runner system’s electric drive provides higher efficiency and uses less energy than a pneumatic drive would.

A complete mould half was developed by Günther’s design department and then constructed by the mould maker Ernst Rittinghaus in close consultation with Günther. It incorporates NTT valve-gate nozzles designed to ensure exact positioning in terms of pitch spacing and to protect against leakage between the manifold and the nozzle. These nozzles have two fits that seal off the manifold area from the cable ducts.

The 16-cavity valve-gate mould is equipped with a powerful servomotor (linear actuator) to drive the sliding-plate mechanism. A finely graduated gear enables this powerful drive to close and open the valve-gate needles in under 0.2 seconds. Also, the actuator’s high repetitive accuracy and the sliding mechanism’s precise transmission provide precision of better than 5 µm in needle positioning. Another advantage of the drive is its modest installation space requirement.

Hall 6, Stand 6511

For further information:

Günther Heisskanaltechnik GmbH

Frankenberg/Eder, Germany

www.guenther-heisskanal.de

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