Causes on black dots occurrence for plastics and its countermeasures

Reducing defects due to foreign materials and black dots is a very important issue at plastic molding production site.

The causes of its occurrence can be briefly divided into.

those are possibly considered.It is necessary to take countermeasures to all of causes.This time, let’s think about black dots.

Mechanism of occurrence

Countermeasures to reduce black dots defects

Arrival and Introducing a new purging pellet (cleaning agent)

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