초록

A barrier fabric is provided which is impermeable to liquids and permeable to vapor. A polymer film is laminated to a porous fibrous web. The composite web is then needled repeatedly with fine conical needles to provide micropores through the film.

대표청구항 ▼

Method of producing a barrier fabric which is permeable to liquid vapors and impermeable to liquids, said method comprising the steps of first laminating a vapor impermeable polymer film to a reinforcing porous fibrous web to provide a composite web and then needling the film of the composite web wi

Method of producing a barrier fabric which is permeable to liquid vapors and impermeable to liquids, said method comprising the steps of first laminating a vapor impermeable polymer film to a reinforcing porous fibrous web to provide a composite web and then needling the film of the composite web with tapered needles to provide a plurality of micropores through said film, said micropores being sufficiently small to prevent substantial transmission of liquids and sufficiently large to permit transmission of vapors.