Johns Manville

Other

Johnsmanville Europe Gmbh

Jörg Lehnert

Thomas Stehlin

Michael Schöps

Werner Groh

Hans-Juergen Meitinger

Christian Hassman

Hermann Weizenegger

Klaus Weisskopf

Jörg Meier

Julia Mögel

The present invention relates to a method for the manufacture of a multilayered filter medium whose air permeability is at least 500 l/msec and a multilayered filter medium obtainable by said method which, when charged with 5 mg/cmSAE-dust of the class 'fine', exhibits a pressure increase of no more than 100 Pa.

Filter medium

Composites made from at least two plies are described, where one of the outer layers is a layer comprising glass fibers, and in particular is a staple glass fiber nonwoven. The layers have been bonded to one another by needling, and the extent of this needling is such that some of the fibers of the organic nonwoven emerge from the surface of the glass fiber sheet. The composite is then provided with a binder by using a rotating roll for single-side application to the glass fiber surface. The composites are particularly suitable for producing bituminized prefabricated roofing and waterproofing sheets, and as backings for coatings, e.g. PVC coatings.

Laminate with improved properties

The present invention provides non-woven laminate that is not subjected to final consolidation by a binder and the production thereof. The laminate includes at least one non-woven mat containing glass staple fibers pre-consolidated with a resin, and at least one non-woven layer of synthetic fibers. The synthetic non-woven layers and the pre-consolidated non-woven mat of glass fibers are bounded together by needling such that a portion of the fibers of the upper synthetic non-woven layer passes through the non-woven mat of glass fibers possibly through the underlying synthetic non-woven layer. The synthetic fibers are heat shrunken and the laminate is binder free.

Non-woven laminate composite

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Schwabmünchen, Germany

Jörg Lehnert