Injection Molding Defects — Burn Marks
Burn marks pertain to the visible discolorations that manifest on the surfaces of molded components, a consequence of undue heating or the charring of plastic resin amidst the injection molding procedure.
Causes:
The genesis of burn marks can be traced to a multitude of elements including, but not limited to, escalated melt temperatures, excessive dwell durations, high-velocity injection rates, or insufficient venting mechanisms. In parallel, the incidence of moisture or impurities within the resin could significantly amplify the susceptibility to the materialization of burn marks.
Solutions:
The circumvention of burn marks necessitates meticulous management of the melt temperature, calibration of residence time to its optimum, and the judicious modulation of injection velocities. Enhancing the venting systems, guaranteeing comprehensive resin desiccation, and maintaining an immaculate molding milieu constitute essential steps to rectify inconsistencies related to burn marks.
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