A message from CW:
The issue with injection hairlines is ongoing since the beginning of our company and very often up for discussion.
Hairlines are an inevitable result from mould injecting with polycarbonate and are basically meeting points of polycarbonate where plastic touches after a full injection. Imagine an empty tooling and draw a line in the middle of the tooling which divides the tooling in part A and B. The “meeting” of polycarbonate happens at the point where part A and B close after a full injected. The annoying thing is that the line doesn’t necessarily has to be in the middle and hairlines can show up anywhere.
Take any moulds that you can find from us and hold upwards to light and try to count the lines you see. You’ll discover a dozen of hairlines but nevertheless our moulds stay unbreakable.
Conical designs are most sensitive to hairlines and actually nobody really knows why or how to explain this from a technical point of view. Hairlines show up more frequently on round shapes than on square shapes. Since more than 2 years everybody wants to work with spheres or cones in combination with colouring techniques because conical model gives the best result with colours. How lucky are we, right?
However, hairlines are usually speaking inside the plastic or just underneath the surface which doesn’t affect the quality nor the result on chocolate. All our moulds pass human quality control but rising / embossed hairlines are still rather difficult to detect with the naked eye. From experience I can tell we have less than 2% rejects from customers.
Chocolate World
