Due to small order quantity, I used colour pigment ( powder form ) on
PS frame retardent grade base for the injection moulding process.
A strange occurrence is that colour tone changes from light colour to
dark colour and than back to light colour again. It happened each time
with same batch of material in the hopper.
The colour is never even although with constant barrel
temperature,constant temperature controller etc,
What causes this phenomenon and can any members advise from this ?
Thanks & Regards
- posted
11 years ago