Patent ID: 11958231
Assignee: NISSEI ASB MACHINE CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 2:
3. A resin container manufacturing method in which a preform disposed in a stretch blow molding mold is stretched by a stretching rod and the preform is stretched by introducing blow air into the preform so as to form a resin container, the resin container manufacturing method comprising:
detecting an actual position of the stretching rod inserted into the preform; and
controlling a supply state of the blow air based on the actual position of the stretching rod by:
detecting an actual position of the stretching rod at a first position and controlling an introduction of blow air as primary air, and
detecting an actual position of the stretching rod at a second position and controlling an introduction of blow air as secondary air,

wherein the primary air introduced starting at the first position is continuously introduced while the stretching rod continuously moves until the detected actual position of the stretching rod is at the second position,
wherein, when the detected actual position of the stretching rod is at the second position, the secondary air is continuously introduced while the stretching rod continues to continuously move, and
wherein the blow air introduced into the preform is switched from the primary air at the start of introduction of the blow air to the secondary air having a higher pressure than the primary air based on the detected actual position of the stretching rod.