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[Moulding problem solution] Black Specks

Author : Date : 7/15/2014 1:25:47 PM
Black Specks

Black/brown specks or deposits are visible on the surface of the moulding,normally caused by contamination or degradation of the material.



Solution:

1.Reduce the temperature of the polymer melt
2.Reduce the screw speed and/or the back pressure
3.Clean the moulding machine thoroughly-full purge
4.Check for any impurities,leaks or dirt deposits in the feed stock hopper supply
5.Check the shot weight.The entire shot weight should not be less than 15-25% of the maximum capcacity of the machine
6.Check compatibility of pigment or master-batch with the base polymer.
7.Reduce the time in which the material is openly exposed to the ambient conditions


 

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