Analysis of the cause: The plastic melt flows into the parting surface or the mating surface of the insert will occur. The clamping force is sufficient, but the film-like excess compound is produced at the junction of the main runner and the runner.
Countermeasure: The clamping force is insufficient, and the high-pressure plastic injected into the cavity causes a gap between the parting surface or the insert matching surface, and the plastic melt overflows into the gap. The mold (fixed side) does not sufficiently contact the nozzle of the machine, and the male and female molds create a gap. (Not tightened) The effect of mold temperature on the crankshaft clamping system. Increase the strength and parallelism of the template. Mould guide bushing wear / mold mounting plate damage / tie rod (Gollin column) insufficient strength to bend, resulting in parting surface offset. The foreign matter adheres to the parting surface. The exhaust sump is too deep. The cavity projection surface is too large / the plastic temperature is too high / over pressure.