moisture steaks or splay marks solution
Usually oblong, silvery surface streaks which are open in the shapre of a U counter to the direction of flow. The material pumped out of the cylinder is foamed and shows blisters on the injection molding parts surface.
Plastic injection molding resin moisture content too high; water vapor is produced during melting and this results in the surface of the molding being torn open
Use the resin adequately predried to a residual moisture content <0.1%(drying the molding resin as per the resin specification)
Increase back pressure
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