Definitions for "FLOW MARKS"
(r) marks or lines on a molded product, caused by imperfect fusion or "knitting"of material.
Wavy surface appearances on a molded part caused by improper flow of the melt into the mold.
Often similar to flow lines, these marks are slight imperfections to the surface of a molded part that are results of the passage of liquefied plastic through the mold cavity. Often exhibits a wavy surface appearance.