3.Mixing and plastication
Polypropylene pellets and pigment concentrates need to be fully melted and blended. If not
properly plasticated, agglomerates may concentrate at the hinge, causing weak areas and
eventual failure.
4.Venting
Because of the fast fill rate requirements, it is of paramount importance that the tool be properly
vented. Clogged, insufficient or poorly placed vents represent additional problems which will
cause flow restrictions and may lead to slow filling, air entrapment, burn marks and cosmetic
defects.