Weld Line Of Injection Molding

Notches, hairlines

Change in apparent color; especially when inorganic decorative effect pigments are used the weld line appears as a dark line;conspicuous in dark, brilliant or transparent moldings having smooth surfaces polished to a high gloss.


As far as possible, position weld lines where they have no visual or mechanical impact (flow promoters, flow inhibitors);

check mold engineering: if necessary enlarge sprue channel, gate and machine nozzle;

avoidance of aprupt changes in wall thickness and nonuniform mold filling;

provide effective mold venting.

Processing: Optimization of melt temperature, mold surface,temperature and injection speed; new color formulation (organic or inorganic pigment)

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