Short shot technology

The moulding cavity only gets partly filled with melt (in general 50-60 %) because the complete component filling is carried out by forming a fluid bubble. The fluid bubble drives the melt front in front of itself so that the component is completely filled at the end with a correct component design and prefilling.
Either water or gas serves as a fluid.

More complex components require an extremely precise pre-calculation of the gate, the injector positioning and the pre-filling process. Moreover, an exactly balanced pre-filling between the cavities is required by using multi cavity moulds.

Where it makes sense, this method is the most economic, because material usage and clamping force of the injection moulding machine are reduced optimally.

 

Suitability:
Particularly suitable are rod-shaped components, such as suitcase handles, brush grips, door handles or similar.

This method is less suitable for materials which are prone to change-over marks due to the fast solidification of the flow front during the switchover period between melt injection and fluid injection. The partial filling reaches its limits if flat areas or fastenings and longer pipe ends are planned apart from the channel areas.

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