B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/22 (2006.01) B29C 61/08 (2006.01) B65D 41/24 (2006.01)
Patent
CA 2545014
The method comprises a) an extrusion stage wherein a extruded tube made of a thermoplastic material (20) is formed by extrusion with the aid of an extrusion die having a diameter D0, a slit width E0 and a section S0; b) a stage wherein the extruded tube (20) is radially expanded in order to form a radially expanded tube (23) having a diameter D2, a thickness E2 and corresponding section of area S1; c) a truncating stage wherein the expanded tube (23) is broken down into tube portions (24); d) a stage in which the tube portions (24) are formed in such a way that a heat-shrinkable cap or capsule is obtained (1) and in which an axial drawing stage is incorporated, between extrusion stage a) and expansion stage b), at the output of the extrusion die (31), in order to obtain an axially drawn tube (22) having a diameter D1 which is typically smaller than D0 and D2, and a thickness El which is typically lower than E0, such that S0/S1 typically ranges between 2 and 10. The advantages of the invention are as follows: it is possible to obtain capsules (1, lb, lc) or caps (la) which are economic, easily heat-shrinkable and which have a stable axial dimension, thereby avoiding any axial distortion, i.e. any axial distortion of said impression (13).
Le procédé comprend : a) une étape d'extrusion dans laquelle on forme un tube extrudé (21) en matière thermoplastique (20) par extrusion à l'aide d'une filière (31) de diamètre D0, de largeur de fente E0 et de section S0, b) une étape d'expansion radiale dudit tube extrudé (20) pour former un tube expansé radialement (23) de diamètre D2, d'épaisseur E2 et de section correspondante d'aire S1, c) une étape de tronçonnage dans laquelle ledit tube expansé (23) est tronçonné en portions de tube (24), d) une étape de mise en forme des portions de tube (24) de manière à obtenir une capsule (1) ou une coiffe (l') thermorétractable, et ou l'on incorpore, en sortie de filière (31), entre ladite étape a) d'extrusion et ladite étape b) d'expansion, une étape d'étirage axial dudit tube extrudé (20), de manière à obtenir un tube étiré axialement (22) de diamètre D1 typiquement inférieur à D0 et à D2, et d'épaisseur El typiquement inférieure à E0, tel que S0/S1 soit typiquement compris entre 2 et 10. Avantages : obtenir des capsules (1, lb, lc) ou des coiffes (la) qui soient à la fois économiques, faciles à thermorétracter, et de dimension axiale stable afin d'éviter toute distorsion axiale, notamment toute distorsion axiale de ladite impression (13).
Granger Jacques
Luciani Andre
Alcan Packaging Capsules
Amcor Flexibles Capsules France
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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