Hi Guys,
I have just went into production with my first injection mold. It is a 2 cavity mold with each cavity having 2 gates (gates are 2mm diameter).
3 of the gates are perfect and leave no witness mark however 1 gate leaves a large circle around the gate (see the 'big circle' in photo attached). Sometimes this gate leaves barely any witness mark at all however the big circle does appear a lot which is leading to way to many rejected parts. Does anyone know how to fix? The molders have tried changing the temperature on the hot controller however we are still getting a lot of rejects. They also took apart the mold, tested the hot runners and said they appear to be working.
Material being used is LG TR557 which is a transparent ABS.
Thank you for any help, feeling a bit lost at the moment as the mold cost so much and even after trying for 3 days we still have not fixed the issue.
Sean