(3) When a problem arises, the following questions should
be asked:
(a) Did anything unusual happen?
(b) Does the extrudate contain air bubbles?
(c) Were the proper weights applied?
(d) Is the unit at the proper temperature?
(e) Was the piston stored in the barrel?
(f) Is the die damaged, that is, chipped?
(g) Is the die bore worn, that is, the diameter is larger than
the maximum specified?
(h) Was the proper amount of material used?
(i) Has the balance been properly calibrated?
(j) Was the proper purge time used?
(k) Was the plug pulled at the proper time?
(l) Was the correct warm-up time used?
(m) Was the barrel cleaned properly?
(n) Is the piston rod straight?
(o) Is the piston tip diameter OK?