To provide a preform capable of being suitably used for a PET bottle having an expanded part, which is expanded downward and stretched in a freely reversely deppressible manner and capable of being formed into the PET bottle having sufficient strength even if the use amount of a resin is reduced.
On the basis of the relational expression: W=aV+b showing the relation of the weight (W) of the body part 16 of the preform 5 and the volume (V) of the bottle 1, the inclination (a) in the relational expression is set to a range of 0.025-0.03 and an intercept (b) is set to a range of 1-4 to set the weight (W) of the body part 16. The length dimension (L) of the body part 16 and the length (H) up to the lowermost end of the expanded part 10 in an expanded state of a bottle body part 3 satisfies the relation of LH/2.3, and on the basis of the relational expression: L=cV+d showing the relation of the length dimension L of the body part 16 and the volume (V) of the bottle 1, the inclination (c) of the relational expression is set to 0.064 and the intercept (d) is set to a range of 21-31 to set the length (L) of the body part 16.
SATO TAISUKE
TOMIZAWA KATSUMASA
ONO KOJI
NAKANE HIROYUKI
MATSUSHIMA KOJI
Susumu Hori
Takeshi Sagi
Kenichi Homma
Tsuyoshi Kagaya
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