1.Select by injection volume
As a guide, generally the injection machine should be selected so that molded product volume will become 30% to 80% of the machine's injection volume. When molding, the relation of the machine's injection volume Q(g) and one shot weight (sprue and runner weight included) W(g) should be in the range indicated below.
Q ＝ （1.3～1.5）×W
5.Backflow prevention ring
Backflow prevention ring is necessary at the screw, because NOVADURAN has relatively low melt viscosity. If this backflow prevention ring is damaged by wear or corrode, cushion volume cannot be kept because of the resin backflow from the cylinder to the hopper when injecting (pressure keeping), and injection pressure (holding pressure) might not be put properly to the cavity. In this case, good molded product cannot be made, so cushion volume and its stability must be well controlled and maintained when molding. Corrosion and abrasion resistance steel grade is preferable for the back flow prevention ring.