DICHTUNGSBAHN MIT EINER INTEGRIERTEN SEMI-INDEPENDENTEN LAGE UND VERFAHREN ZU IHRER HERSTELLUNG

摘要

A carrier is coated with a suitable adhesive. That surface of the adhesive which is to be placed in contact with the support for the membrane is united with an assembly consisting of a film, and a sheet of material which does not bond to the film. The sheet is impermeable to the hot adhesive, and both film and sheet have perforations which are in substantial alignment. The sheet is positioned on the outside of the assembly, facing toward the support. The adhesive is exposed through the aligned perforations and provides continuity of material throughout the membrane. The imperforated portions of film and sheet can slide relative to each other, thus providing a so-called "limited-slip sheet" for the membrane. Preferably, the impermeable sheet is preperforated, while the perforations in the film are created by the heat of the adhesive, as both film and sheet are applied simultaneously with the coatings of the carrier by the adhesive. Variants which further improve the emplacement of the membrane on the support are also disclosed.