To provide a preform sterilizing method capable of performing the sterilization treatment of a preform in a short time and having no remaining fear of a sterilant.
The PET preform 1 is subjected to steam sterilization in an inverted posture wherein its mouth part 2 is turned downward. In this case, the steam sterilization is performed by injecting steam to the inner surface 1a of the preform 1. The sterilizing condition of the preform 1 is set so that the inner surface 1a of the preform 1 is held to a temperature higher than the glass transition temperature of the preform 1 for a predetermined time and the outer surface 1b of the preform 1 is held to a temperature lower than the glass transition temperature. Next, aseptic air is ejected using a common nozzle pipe 3 immediately after the completion of steam sterilization to remove water from the preform 1.
HASHIMOTO MASAAKI
OTSUKA ATSUHIRO
ORII MASATO
| JPH03290226A | 1991-12-19 | |||
| JPH0776325A | 1995-03-20 |
Eiichiro Kubota
Kozu Sako
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