Needle valve hot runner outlet hole shrink what is the reason?
The higher the temperature is, the greater the shrinkage, so when the product is cooled naturally, the needle valve has the largest shrinkage hole.
Because the valve needle is into the gate, the hot runner temperature here is the highest, so the plastic temperature near here is the highest.
Because the valve needle is into the gate, the hot runner temperature here is the highest, so the plastic temperature near here is the highest. The higher the temperature is, the greater the shrinkage, so when the product is cooled naturally, the needle valve has the largest shrinkage hole.
