Heat shrinkable closure sheets and sleeve structures and...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 63/42 (2006.01) B29C 61/10 (2006.01) B29C 65/00 (2006.01) B29C 65/50 (2006.01) B29C 61/06 (2006.01)

Patent

CA 2065789

A longitudinally heat shrinkable closure sheet has a hold-down adhesive portion adjacent each longitudinal end for application on the exposed end portions a heat shrinkable wrap-around sleeve applied around a pipe or other article to be covered. Heat is applied to the closure sheet in order to weld the adhesive free portion of the underside of the closure sheet to the end portions of wrap-around sleeve. The initial shrinkage of the closure sheet between the hold-down adhesive portions draws it tightly into contact with the upper side of the end portions. Shearing forces are applied between the closure sheet and the end portions firstly as the closure sheet contracts relative to the end portions, and secondly, as the sleeve shrinks, develops hoop stress and stretches the closure sheet, and a high strength fusion bond is achieved between the closure sheet and sleeve.

Une feuille de gainage thermorétractable dans l'axe longitudinal comprend une portion adhésive de retenue, le long de chaque extrémité longitudinale, destinée à être appliquée sur les portions d'extrémité exposées d'un manchon enveloppant thermorétractable installé autour d'un tuyau ou tout autre article à recouvrir. Une source de chaleur est appliquée sur la feuille de gainage pour souder la portion sans adhésif, sous la feuille de gainage, aux extrémités du manchon enveloppant. La rétraction initiale de la feuille de gainage entre les portions adhésives de retenue permet d'établir un contact étroit avec les parties supérieures des portions d'extrémité. Des forces de cisaillement s'exercent entre la feuille de gainage et les portions d'extrémité, premièrement lorsque la feuille de gainage se contracte par rapport aux portions d'extrémité et, deuxièmement, à mesure que le manchon se rétracte, ce dernier provoque une contrainte annulaire qui entraîne l'étirement de la feuille de gainage. Il se produit donc un assemblage par fusion très résistant entre la feuille de gainage et le manchon.

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