A very versatile and common option is the shifting of the preform into a second cavity or a second mould by hand or by robot. Certain geometries can only be made through such shifting. Here, we have two design options:
Shifting by means of a robot within the multi-component machine
With this technology, a robot unloads the finished part and inserts the preform into the finish injection station at the same time. That is to say, each cycle produces a preform and a finished part.
When shifting the preform that has not yet cooled, specifically if the plastic material is brittle or partially crystalline, one should expect free shrinkage, which should be taken into consideration in terms of the geometry of the second cavity.
For some mouldings, the use of a dial or indexing plate can thus be avoided, which will cut on tooling costs.