Flakes in Mold, gating?

[Joel JS]

Hello all,

So I just sampled this new tool and everything looked great..... well.......until we starting noticing a lot of parts with flakes on them, attached at the parting line. (And looking inside the the mold there are plenty of flakes on the parting line face after running for 1 hour.)

Pictures attached of a flake on the part, and the part, and the runners. Material is acetal. Mold is 4 cavity, hot to cold....with (3) tunnel gates each to the part .

Our tooling guy is going to check the mold for sharp edges, but I think this is happening as the gates tear free from the parts as the mold opens at the tunnel gate. So, if I am correct, has anybody been able to successfully correct this issue by tooling or process?

Thanks!
Joel