Preform neck crystallization method

摘要

A neck crystallization method includes inserting a core into the neck, heating the neck using a heater group disposed along a transfer direction while rotating the preform on its axis, and transferring the preform along the transfer direction in a state in which the core is inserted into the neck, and cooling the neck of the preform in a state in which the core is inserted into the neck. The heating of the neck includes a first step that drives first heaters positioned on the upstream side in the transfer direction at a first power, and a second step that drives second heaters positioned on the downstream side of the first heaters at a second power that is lower than the first power until the temperature of the neck reaches a crystallization temperature zone.

主权项

1. A preform neck crystallization method that crystallizes a neck of a preform that includes the neck, a body, and a bottom, the method comprising:
inserting a core into the neck; heating the neck using a heater group disposed along a transfer direction while rotating the preform on its axis, and transferring the preform along the transfer direction in a state in which the core is inserted into the neck; and cooling the neck of the preform in a state in which the core is inserted into the neck, the heating of the neck including: a first step that drives first heaters within the heater group at a first power to heat the neck to a temperature lower than a crystallization temperature zone, the first heaters being positioned on an upstream side in the transfer direction; and a second step that drives second heaters within the heater group at a second power that is lower than the first power until a temperature of the neck reaches a crystallization temperature zone, the second heaters being positioned on a downstream side of the first heaters.