Blow molding method for bottles comprises blowing premolds in, low pressure and high pressure stage, some of air used being recycled after blow molding via recirculation valve whose outlet is connected to low pressure air tank

摘要

Blow molding method for bottles (2) comprises blowing premolds in a first, low pressure stage followed by a second, high pressure stage. The air used in each stage is controlled by a valve (44, 45). Some of the air is recycled after blow molding via a recirculation valve (47) connected in parallel to the other valves whose outlet (50) is connected to the low pressure air tank (42). An independent claim is included for apparatus as described for carrying out the method.