At the bottom of the glass bottle defect
( 1) Bottle antiskid lines ( Crescent shape is also called the explosion-proof grain, have certain skid and guide temperature effect) Not clear, air compressor gas pressure can not reach, or machine speed is too high, vent not playing or too small.
( 2) The bottle burst, if the bottle too thick or too thin cooling process temperature is not uniform occurrence blowout phenomenon.