Patent ID: 8448472

Claim:
An I. S. machine which includes a blow station having a blow mold which closes to support a parison with the supported parison undergoing reheat and then being blown into a bottle, comprising a blowhead mechanism including a blow tube, a supply conduit connected to said blow tube, means for supplying air at a first pressure to said supply conduit to pressurize the interior of the parison, means for supplying air at a second pressure to said supply conduit to pressurize the interior of the parison, and a control for controlling the air supply means, wherein the control is configured: to control the first-mentioned air supply means to supply air to said supply conduit during reheat to pressurize the interior of the parison to the first pressure (P internal ), the first pressure being sufficient to resist collapse of the parison which could form a birdswing in the blown bottle, while being insufficient to blow the parison into a blown bottle; and to control the second-mentioned air supply means to supply air at the second pressure to said supply conduit to blow the parison into a bottle following reheat.