Crystalline resin extends upward from the gate for about 20~30mm in streaks or bands. Typically seen if the machine has been stopped for just a few minutes. May be accompanied by other swirls or clouds of crystallized material in the body of the preform.
It is normal to see this fault on the first one or two shots after a start-up from cold because decomposed material will have come from the hot runner. Do not recycle preforms since they will have a lowered I.V