Heat shrinkable closure sheets and sleeve structures and methods

Details Heat shrinkable closure sheets and sleeve structures and methods Heat shrinkable closure sheets and sleeve structures and methods

1991-05-02

1992-12-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Shrinkable or shrunk

428 57, 428192, 428349, 428913, 428 369, 174DIG8, 138104, 138155, 156 86, 1563084, B32B 712

Patent

active

051750325

ABSTRACT:
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.

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