| 摘要 |
A longitudinally heat shrinkable closure sheet (11) has a hold-down adhesive portion (14) adjacent each longitudinal end for application on the exposed end portions (16a,16b) a heat shrinkable wrap-around sleeve (16) applied around a pipe or other article to be covered. Heat is applied to the closure sheet (11) in order to weld the adhesive free portion of the underside of the closure sheet (11) to the end portions of wrap-around sleeve (16). The initial shrinkage of the closure sheet (11) between the hold-down adhesive portions draws it tightly into contact with the upper side of the end portions (16a,16b).Shearing forces are applied between the closure sheet (11) and the end portions (16a, 16b) firstly as the closure sheet (11) contracts relative to the end portions (16a,16b), and secondly, as the sleeve (16) shrinks, develops hoop stress and stretches the closure sheet (11), and a high strength fusion bond is achieved between the closure sheet (11) and sleeve (16). <IMAGE> |
