Importance

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Abstract

A method and apparatus for producing a self-adhering product with a multi-part release liner system that will not result in unwanted adhesion at the edges is disclosed. The self-adhering product may be a roofing sheet, or waterproofing membrane. The multi-part release liner system includes a strip of material placed on the adhesive surface below and between each abutting edge of the release liner. The material allows each section of the release liner to be removed without the edges of the liner adhering to the underlying sheet. The release liner may also be a single piece liner, with at least one strip of perforations that allows the liner to be removed in individual sections. In this application, the material not only prevents edge adhesion, but also prevents adhesive from the substrate flowing through the perforation holes. The invention may also be applied to release liner systems that combine multi-part release liners and perforated release liners. The method and apparatus of the invention are applicable to any self-adhesive product that requires a release liner.

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First Claim