Blisters

A raised defect on the surface of product cause by trapped gas.

Some possible causes:
a. Back pressure too low.
b. Mould temperature too low.
c. Use of regrind that is too coarse.

Remedies, to check:
a. Ensure that back pressure should be increased in small increments until the
    problem is solved.
b. Increase the temperature of the mould.
c. Limit the usage of regrind.


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