Dual-Shot Moulding  Experts Solve Problems
December 1,2016.

From anti-vibration to isolation, dual-shot injection technology has greatly improved today's product performance. It helps the products to achieve soft touch, robust support and durability requirements at the same time.  Yet, not every mould-maker can manage bunches of problems that over-moulding brings in. BELOW is an example of dual-shot mould coordination. It shows how CN's mould designers think out of the box and solve the problem by modifying standard mould structure.

Normal Way of doing

Mould 1

Mould 2

Unlike conventional moulds, the angle pin and the slides are installed on Top Clamping Plate and A-Plate respectively. When the first shot is finished, two B-Plate switches for the next shot to mould another material.

Problem Posted.

Clearly, during mould closing, it is not predictable whether Top Clamping Plate close fully before A-Plate and B-Plate or the other way round. In the figure above, Top Clamping Plate and A-Plate close quicker. If the mould keep closing, the slides (light green) will collide with the part made in Mould 1 previously (pointing by red arrow). Thus, the problem occurs. How could we prevent the clash?

Solve it !

Add a spring between Top Clamping Plate and A Plate. When the mould is closing,  the spring will resist clamping force to force A-Plate and B-Plate close first. Simple and Easy. :)

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