In a discussion yesterday, I was asked this question…
Why add a delay before screw recovery? None of my guys do this, is it important?
Immediately after 2nd stage pack, there is a large amount of pressure present in front of the screw. If this pressure is not relieved, it will increase the rotational torque applied during screw rotation. To prevent screw damage, or snapping, either screw delay or screw decompression can be used.
This concern is even greater with electric molding machines since the servo-motor can apply a great amount of torque instantaneously. This can quickly weaken, twist, or break the screw within the barrel.