Patent ID: 9238341
Filing Date: 2016-01-19
CPC Classification: B29C,B29D,B29K,B65D

Claim Text:
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.