InnoDan71
18th December 2014, 12:22 PM
Hello,
I am hoping to get some help with a contamination problem I am trying to resolve. I am seeing a black spot on the show surface on apart that I am molding out of 20% talc filled poly pro. The spot is consistently on the same corner of 1 cavity in a two cavity mold with a fall out of 4%. I am also seeing build up of black debris in the vent closest to the affected corner.
So far I have been unable to determine if that debris is the cause or another effect of the main problem. During our investigation we have found that the colorant we are using (4% colorant to natural resin mix ratio) has had some problems with poorly mixed pigment that is visible as black streaks under a microscope.
Any suggestions on root cause would be much appreciated.
Thanks,
Dan
I have attached a picture of the blemish and then a shot or the same contamination under a microscope.
80
I am hoping to get some help with a contamination problem I am trying to resolve. I am seeing a black spot on the show surface on apart that I am molding out of 20% talc filled poly pro. The spot is consistently on the same corner of 1 cavity in a two cavity mold with a fall out of 4%. I am also seeing build up of black debris in the vent closest to the affected corner.
So far I have been unable to determine if that debris is the cause or another effect of the main problem. During our investigation we have found that the colorant we are using (4% colorant to natural resin mix ratio) has had some problems with poorly mixed pigment that is visible as black streaks under a microscope.
Any suggestions on root cause would be much appreciated.
Thanks,
Dan
I have attached a picture of the blemish and then a shot or the same contamination under a microscope.
80