July 18, 2020

Improving measures for welding marks and streaks of PVC injection moulded parts (1)

To solve the problem of streaks and weld marks on PVC parts, first of all, the speed of melt injection into the cavity must be reduced to prevent the folding wave or spiral injection, or the occurrence of unstable filling phenomena such as melt shunt.

However, sometimes due to the mold cavity being too wide, when the injection speed has been reduced to the point where the screw can hardly advance, the problems of streaks and weld marks still cannot be solved, which often occurs in production. If a flow stopper or a buffer bag is added to the runner in front of the gate, it can play a role in reducing the speed of the melt entering the cavity, so as to reduce the streaks and weld marks of the injection molded parts.

For the situation where streaks and weld marks are not particularly serious, using this method in conjunction with the tuning technique, the problems of streaks and weld marks can be solved, but if the problem is more serious, more solutions are needed.

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Injection Molding, Plastic Mold Case, Plastic Molding Design, Plastic Parts
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