balanced runners
balanced runners
(OP)
I have an 8 cavity plastic injection mold with hot manifold into cold runner.
The outside cavities short shot about 25% less of the inner cavities. What is the best way to balance the outside cavities for uniform mold fill?
The outside cavities short shot about 25% less of the inner cavities. What is the best way to balance the outside cavities for uniform mold fill?






RE: balanced runners
If not , choke off the inner runner or widen the outer runner.
Avoid multiple gate sizes if your cavities are identically machined.
RE: balanced runners
RE: balanced runners
RE: balanced runners
Regards
pat
RE: balanced runners
This is supported by a few points in the study. For one, you will see imbalances on the first shots and not only once the tool heats up and it thermally stable, or if you short shoot with no cooling - simply put the mold in and do a short shot. Also cooling has little impact on short shot filling. Cooling has more of an impact on cosmetics, packing, etc...as the above tests indicate.
Take care and have fun,
Dave