Resin and pigment get caught up and accumulated in the narrow runners. These are released sporadically into the product during production and cover it with black spots and/or strips of color – causing serious quality issues.
Using the relevant RAMCLEAN® grade per the polymer used. Most of our grades are designated for hot runners, and does not contain glass fibers and consists of suitable tiny particles.
We recommended cleaning the extruder first and then injecting through an open mold, at a changing injection speed, while performing short and quick shots