Patent ID: 11897178
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 4:
5. A plastic bottle manufacturing method comprising:
a preform heating step of heating a preform by a preform heating part that includes a plurality of heating bodies disposed in a longitudinal direction of the preform;
a blow-molding step of molding a plastic bottle by blow-molding the preform that has been heated; and
a preform temperature measuring step of measuring temperatures of the preform at a plurality of measurement points in the longitudinal direction of the preform, the preform temperature measuring step being provided between the preform heating step and the blow-molding step,
wherein positions of the plurality of measurement points are provided in correspondence with positions of the plurality of heating bodies,
wherein an output of each heating body of the preform heating part is controlled based on an optimal temperature distribution at each measurement point of the preform that has been predetermined and an actually measured temperature distribution at each measurement point of the preform, and
wherein the preform is divided into a plurality of zones in the longitudinal direction, wherein a number of the zones, a number of the measurement points and a number of the heating bodies are the same each other, and wherein each measurement point is set at a location at which a temperature is highest in a corresponding one of the zones.