FLOW MARK IN HIPS PROCESSING
Published: February 28th, 2013
Hello everyone in the forum,
We have problems with processing HIPS (white) using shut off valve hot runner system.
It's a new Mold, equiped with shut off Valve hot runner Nozzle.
The gate opening is 4.8mm dia.
Part weight: 700 gm
There is dimple opposite the gate.
The mold has been tried out several times but the flow mark around the gate area (say 30 to45 mm away from the gate) still exists. The process setting has been tried in different setings, with low to high step injection, increasing the Nozzle temperature, using MTC in cavity but still could not get rid off from the flow marks.
All your inputs will be highly appreciated.