Post-Formed Successively Peelable Coextruded Polymer Film

摘要

Multilayered polymer films are configured so that successive layer packets can be delaminated in continuous sheet form from the remaining film. The films are compatible with known coextrusion manufacturing techniques, and can be made without adhesive layers between layer packets. The layer packets are individually peelable from the remainder of the film. Combinations of polymer compositions are used to allow non-adhesive polymer layers to be combined such that irreversible delamination of the film is likely to occur at interfaces between layer packet pairs. The films are post-formed, e.g. using heat and pressure, to deform the film from an initial flat or limp condition into a contoured shape that is self-supporting. The contoured shape may comprise regions of simple and/or complex curvature. Despite the permanent contoured shape, individual packets can still be successively peeled away to expose a fresh surface of the next layer packet, having the same contoured shape.

主权项

1. A film comprising a stack of polymer layers, the polymer layers being organized into layer packets, each of the layer packets having at least two of the polymer layers;
wherein attachment between adjacent layer packets is weak enough to permit the layer packets to be separately irreversibly delaminated from a remainder of the stack, and the stack is configured to promote such irreversible delamination between such layer packets; wherein all of the polymer layers in the stack of polymer layers have respective polymer compositions that are coextrudable with each other; and wherein the film has a self-supporting contoured shape.