Fan mould sets, the key point is the fan blade mould, need the very even injection points to keep the blade moulds' plastic filling are the same pressure and same distances. In the same time, we have to know that the moulding area's different temperature will caused the filling not even. this will cause the fan blade parts' gravity point will not in the center, so when the blade turning, there are ugly noise. We know how to make injection even and cooling effects on the molding areas are the same.
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