Know the Basics of Machine Evaluation

摘要

As the machine is cycling, note the position of the screw at the end of screw recovery. Is it identical on every shot? Also check that the machine is switching from first to second stage as the screw hits the set cutoff position - assuming you are cutting off via stroke position. At high injection rates, the screw may miss the cutoff position a bit, but it should be no more than 0.05 mm (0.002 in). If the machine fails any of these tests, the shot size is fluctuating beyond acceptable levels.