Preform for container made of plastic material
AssigneeS.I.P.A. Societa' Industrializzazione Progettazion E Automazione S.P.A.
InventorsDavid Gaiotti, Laurent Sigler, Dino Enrico Zanette, Matteo Zoppas
Life of this patent
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Abstract
The part under the neck ring (9) of a preform for blowing a PET bottle of predetermined capacity not larger than 75 cl and with a max. material weight of 15 g, is inclined by an angle α less accentuated than normal, max. 17°, which allows to make a preform with a thickness t2 of the wall thinner than 1.9 mm and a thinner inner diameter of the preform body in order to allow a lower stretch ratio starting from a larger preform to obtain the final bottle of predetermined capacity.
Claims3
A preform made of plastic material for producing a PET bottle having a volume smaller than 1 L and weighing less than 16 g by means of a stretching-blowing operation, said preform defining a longitudinal axis (X) and provided at a first end thereof with a cylindrical neck (3) and defining the following parts in sequence:
- a threaded end portion (8) for screwing a cap,
- a neck ring (9) under said threaded end portion (8),
- a first cylindrical connection segment (10) having a first predetermined constant outer diameter and a wall having a first constant thickness (t1) substantially equal to the thickness of the wall of the PET bottle in the first cylindrical connection segment,
- a preform body, intended to be heated before the blowing operation, defining in turn the following parts:
- a second connection segment (5) with outer wall (21) tapered by a first angle (α) with respect to the longitudinal axis (X) and with inner wall (22) tapered by a second angle (β) with respect to the longitudinal axis (X), and having a predetermined length (H3) on the longitudinal axis (X),
- a cylindrical segment (4) having a constant second outer diameter smaller than said first outer diameter and a constant second thickness (t2) greater than the first thickness (t1),
- a bottom (6) which closes a second end of the preform (2), wherein the first angle (α) is from 6° to 17°,
- characterized in that
- the second thickness (t2) is from 1.4 to 1.7 mm,
- the second angle (β) is from 9 to 21°,
- the length (H3) is from 10 to 20 mm.
Dependencies are inferred from the claim text.