Effect of non-unifrom wall thickness of plastic parts
👉 Sink marks result from a wall yielding to the shrinking interior mass.
👉 The already cooled sections will not yield to the shrinking action of the cooling interior mass causing voids in the thick portion of the part.
👉 A part with non-uniform wall thickness will cool unevenly, resulting in high molded in stress.
👉 Concentrated stress at the junction of high and low shrinkage areas may cause a part to warp.