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causes and solutions for knit Lines (or weld lines)

If a part has a hole or insert, the molten plastic will flow around the opening and meet on the other side. Where the two sides meet, the part will be weaker, and a knit line may be visible. Often this effect can be minimized by adjusting processing parameters such as injection speed and mold temperature.If it is due to the venting is poor, then the vents should be placed at last place to fill and converging flow fronts, and the size should be large. If the cause is the melt temperature is too low, then we should increase the heating and increase the injection speed.
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