• How to fix Splay mark on PP plastic injection molded part

    Splay mark, is also called as Splash Mark or Silver Streak.It is a cosmetic defect that occurs in plastic injection molding process, when silver or white streaks appear on the surface of the molded part. Sometimes Splay can be quite difficult to determine, as the appearance is very similar to other injection molding defects, such as surface scratches, scuffs, flow lines, delamination from contamination, and flaking (also known as cold slugs).   Why there is Splay? There are many possible reasons for the appearance of splay mark, molding process, the mold itself, the machine, or the material.   Material The most common cause of splay is material moisture. It is easy to identify that.  The moisture splay does not occur in the same place every time, or in some cases the splay is all over the part. In this case, use dry material, review material drying process, review material storage for contamination issues Molding process  Too much heat can have an appearance similar to moisture splay. The…

    Injection molding process October 19, 2019
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