B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/00 (2006.01)
Patent
CA 2240252
A preform (9) made of thermoplastic material and including a body (11) provided with an at least partially longitudinally extending inner partition (10). The preform is used for moulding and particularly blow moulding or stretch-blow moulding a container with a body having opposed portions defining hollow recesses with inwardly-directed convex surfaces, said portions being spaced apart by said inner partition. In a straight cross-sectional view, the body (11) has a non-circular outline with two opposed portions (a, b) separated by a minimum distance (d1) that is smaller than the distances between the other pairs of opposed portions of said outline. The inner partition (10) extends between said two opposed portions (a, b), and said distance (d1) is such that, relative to the periphery of the body (11) of the preform, during moulding, the inner partition (10) is transversely stretched at a rate equal to that at which the body (11) is transversely or peripherally stretched.
Préforme (9) en matière thermoplastique ayant un corps (11) pourvu d'une cloison intérieure (10) d'étendue longitudinale au moins partielle et destinée à la fabrication par moulage, notamment par soufflage ou par étirage-soufflage, d'un récipient dont le corps possède des zones opposées formant des empreintes creuses de convexité tournée vers l'intérieur et entretoisées par ladite cloison intérieure; le corps (11) présente, en section droite, un contour non circulaire avec deux zones opposées (a,b) séparées par une distance minimale (d1) inférieure aux distances séparant les autres zones deux à deux opposées dudit contour; la cloison intérieure (10) s'étend entre ces deux zones opposées (a, b); ladite distance (d1) est telle, par rapport au périmètre du corps (11) de la préforme, que, lors du moulage, la cloison intérieure (10) subisse un taux d'étirage transversal sensiblement de même valeur que le taux d'étirage transversal ou- périmétrique subi par le corps (11).
Goudreau Gage Dubuc
Sidel
LandOfFree
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