let me introduce a variant of the pin-point gate design, it is so called submarine gate, it can be accompanied with an automatic slug ejection mechanism. Compared to a three-plate mold design with a pin-point gate, this one is simpler and lower in mold manufacturing cost. The basic structures of submarine gates are known as pulling-break off and pushing-break off.
There are a few things to take in to consideration when trying to use a submarine gate solution with a Polycarbonate material.
As the material is hard and very resistant to flex it is important that a steep gate angle is used from the parting line and on to the part surface.
This minimizes the amount of deflection needed to remove the gate from the mold.
At The Tool Hub we recommend an angle of 60 degrees with an absolute minimum of 55 degrees if the gate distance is kept short.
We also recommend to keep the gate as short as possible as this also reduces the amount of deflection needed.
Keep the runner area as small as possible to allow maximum flex, and only if a pressure drop study reveals that the section is too small increase the area.
thanks for your introduction, actually submarine gate is often used in our mold design