Eliminate Black specs from transparent molding

Black specs contamination in molding

Carbon buildup and black specks are usually brought up by either of the the following factors:

• Negative flow zones or still spots in the cylinder, nozzle, or die.
• Hotspots in the machine.
• Additives, fillers, and color pigments from the delivery system are left behind.
• polymer degradation caused by excessive heat, shear force, or barrel dwell time.
• Resins which are unstable being held in the machine for a long time.
• Inadequacy of a routine maintenance schedule.

At some point, the carbon accumulation will fracture and be propelled forward by the screw, appearing as black flakes in the finished product.

Regular purging with Unicleanplus purging compound is advised during shutdown or startup as well as after every resin or color change to get rid of this black spec issues.

Specific grades from Unicleanplus has shown remarkable results in highly demanding parts such as transparent LED lens, head lamp covers and has proven drastic reduction in rejection percentages.

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