B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 1/02 (2006.01) B29C 49/00 (2006.01)
Patent
CA 2546605
This invention relates to the preform to produce a plastic container for packaging foodstuffs, and especially to blow mould thin-walled containers which can be hermetically closed with a metal lid by double seaming. The preform (1) includes a body (4) and a convex hemispherical bottom (6). The body (4) has a conical shape that flares towards a cylindrical neck (2) surrounded by a flange (3) that terminates in a thickened rim (5). Preferably, the angle (.alpha.) at which the internal body surface (4) flares towards the cylindrical neck is greater than the angle (.beta.) at which the external body surface (4) opens upwards, and the thickness (g2) of the cylindrical neck (2) is less than the thickness (g3) of the bottom (6).
L'invention concerne une préforme afin de fabriquer un contenant plastique, notamment afin de mouler par soufflage des contenants à paroi mince qui peuvent être hermétiquement fermés au moyen d'un couvercle métallique par assemblage par double soudure. Cette préforme (1) comprend un corps (4) et un fond hémisphérique convexe (6). Ce corps (4) présente une forme conique qui s'évase vers un goulot cylindrique (2) entouré d'une collerette (3) qui se termine en un bord épais (5). De préférence, l'angle (.alpha.) selon lequel la surface du corps interne (4) s'évase vers le goulot cylindrique est supérieur à l'angle (.beta.) selon lequel la surface du corps externe (4) s'ouvre vers le haut, et l'épaisseur (g2) du goulot cylindrique (2) est inférieure à l'épaisseur (g3) du fond (6).
Lewandowski Dariusz
Milkowski Bogumil
Toborowicza Andrzej
Gowling Lafleur Henderson Llp
Invento Spolka Z. O.o.
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