Black Specks

Degraded plastic material or contaminants like paper, cotton threads; that has
carbonised which appears as small black dots.

Some possible causes:
a. Excessive resident time in barrel.
b. Sprue bush cracked or not seat properly.
c. Contaminated raw material.
d. Inconsistent cycles.

Remedies, to check:
a. Inject the moulding in a proper sized machine.
b. Ensure the nozzle tip opening has an equal or smaller diameter than sprue
    bush, which ensures a proper seal.
c. Use only high quality material, maintain good house keeping practice and
    properly training material handling personnel


                              Black speck ( black dot)