B - Operations – Transporting – 31 – C
Patent
B - Operations, Transporting
31
C
B31C 3/00 (2006.01) B65H 75/10 (2006.01)
Patent
CA 2514587
Wide ply gaps (18) are intentionally introduced into one or more plies (14) in a radially intermediate zone of the wall of a spirally wound tube (10). Each ply having wide ply gaps (18) is narrower than the width that would ordinarily be employed at a given spiral winding angle to achieve a butt joint between adjacent edges of consecutive turns of the ply (14), and the ply (14), and the ply is wound at that given spiral winding angle in such a manner that gaps (18) are defined between the adjacent edges of the consecutive turns of the ply (14). The wide ply gaps have the effect of increasing the compliance of the intermediate zone of the tube wall in the radial direction. Such increased radial compliance has been found to improve the ID stiffness of the tube (10) relative to a tube constructed of the same materials but having no ply gaps (18) in the intermediate zone.
De larges espaces intercouches (18) sont introduits intentionnellement entre une ou plusieurs couches (14), dans une zone intermédiaire au plan radial de la paroi d'un tube enroulé en spirale (10). La largeur de chaque couche comportant des espaces intercouches larges (18) est inférieure à celle ordinairement utilisée selon un angle d'enroulement en spirale donné, si bien qu'un joint bout à bout est obtenu entre les bords adjacents des spires consécutives de la couche (14). Par ailleurs, la couche (14) est enroulée selon un angle d'enroulement en spirale donné, si bien que des espaces (18) sont définis entre les bords adjacents des spires consécutives de la couche (14). Lesdits espaces augmentent la compliance de la zone intermédiaire de la paroi du tube dans le sens radial. Il s'avère que l'augmentation de la compliance radiale améliore la rigidité et donc le maintien du DI du tube (10) par rapport à un tube construit dans les mêmes matériaux mais exempt d'espaces (18) dans la zone intermédiaire.
Bellum Cliff A.
Burns Mark P.
Niu Xiaokai
Qiu Yanping
Van de Camp Johannes W.
Sim & Mcburney
Sonoco Development Inc.
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