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when sync marks develop we can Define the problem in either of two ways one there is too high in internal stress within the plastic part caused by shrinkage or two we can say that the part has too low a surface rigidity if the plastic cannot shrink by forming a void inside then the plastic shrinkage must occur on the outside of the part a snc mark the solution to eliminating SN marks then is to either reduce the internal stress or increase the surface rigidity of the part what can the molder do to correct for sink marks first the molder must make sure the shot size is large enough most molds are run with a cushion ahead of the screw the cushion should be small but if there is no cushion and the screw bottoms during injection none of the other machine controls that would normally help solve this problem will be effective
