This is an excerpt from Lesson 2 in our Injection Molded Part Problems and Solutions interactive training program. The title of this lesson is Sink Marks in Injection Molding - How To Fix Them. More details on the complete Molding Problem and Solutions course can be found at:
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Sink marks in injection molded plastic parts are depressions on the surface of the part. This lesson first teaches the cause of sink marks "from the plastic's point of view". Next the student is shown what plastic processing conditions need to be changed to fix the sink mark problem. And last, they are taught the specific injection molding machine controls that should be adjusted to solve the problem.
This comprehensive step-by-step approach give the student a complete understanding of the problem and allows them to fix sink marks regardless of the plastic part design or plastic material used.
The complete Molding Problems and Solutions course covers 11 of the most common injection molded part defects found in plastic parts. These are Voids, Sink Marks, Short Shots, Flash, Weld (Knit) Lines, Splay (Silver Streaks), Jetting, Burn Marks, Warp, Cracks and Part Breakage, and Controlling Molded Part Dimensions.
