Rocker Bottoms

Rocker bottoms Blowing air not vented before mold opens Insufficient cooling Increase air exhaust time Clean mold cooling channels Increase blow time... 

Rocker-bottom or bottom-dump cars shall be equipped with positive locking devices to prevent unintended dumping. 

Parison size is very important—too small a parison can result in a thick pinch-off, which can cause rocker bottoms and warpage, and too high blow ratios to make the product without excessive thinning or blowouts. Too large a parison may result in a thicker wall than wanted at the ends of the pinch-off, excessive flashing, trimming problems and excessive cooling requirements. The correct parison lies somewhere between these two scenarios. 

Rocker n. A colloquial term for a blown container that is defective by reason of a bulged or deformed bottom causing the container to rock when placed upright on a flat surface. 

Rocker. A glass bottle that has a faulty, convex, bottom. 

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