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News / Innovations
IRC show novelty VARIO cold runner system - First results from practical use
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The patent pending VARIO cold runner system presented at the IRC 2009 generated strong interest and met with enthusiastic approval among the visitors. This cold runner technology is the first to enable a variable adjustment of nozzle distances in order to be applicable for different moulds. Hence, this cold runner provides a tremendous cost-saving potential even for small batches, because multiple use is feasible due to simply adjusting the nozzle positions.
The prototype showcased at the IRC in Nuremberg quickly became a "show toy", as many visitors to the booth tested themselves the ease of adjusting the nozzles.
We were of course asked by many interested visitors to what extent this new system has proved itself in practice. However, as prototypes for shows are typically completed just in time, the practical tests take then place following the "good idea".
In this field we have now made much progress and all internal tests have successfully been implemented.
The following items were particularly tested:
Pressure resistance of the overall system, especially the effects on the nozzle turning mechanism and the stability when purging vulcanized material (material change) out of the cold runner:
The purging of the vulcanized distributing channels was repeatedly carried out and was possible without any problems despite most various nozzle adjustments. After having conducted the full test program, the complete cold runner system was dismantled into its elements and checked. There were no damages. The turning mechanism was still working impeccably. The sealings towards the heat transfer media did not cause any problems.
Influence of the nozzle position on the purged out volume
First of all, it has to be mentioned once again that it is a naturally balanced distributing system. Balancing stays also completely maintained, no matter which position the nozzle is having. Despite this natural balancing, there are always slightly different purged out weights per nozzle in practice. If required, these weights can be optimized with available balancing inserts. As far as our tests were concerned, we did without, because the relative deviation depending on the nozzle position and the repeating accuracy were of main interest to us.
As expected and presented in the following table, the nozzle position had only little impact on the quantities of material purged out. In this context it has to be emphasized that the adjustment range (nozzle positions) can be infinitely varied from 260 mm to 420 mm!
The tests proved that the VARIO cold runner met all expectations. First user tests will soon be conducted at a renowned manufacturer of seals. more »
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