Laminate with improved properties
AssigneeJohns Manville
InventorsJörg Lehnert, Werner Groh, Michael Schöps, Hermann Weizenegger
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Abstract
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.
Claims17
A process for producing a laminate comprising at least two layers, at least one layer comprising a nonwoven made from synthetic organic fibers and an outer layer comprising at least one layer of glass fibers, said process comprising:
- (a) applying a nonwoven made from synthetic organic fibers to a layer comprising glass fiber preconsolidated with a resin;
- (b) bonding the layers by needling in the direction of the layer comprising glass fibers such that some of the synthetic fibers penetrate the glass fiber layer and emerge from the outer surface of the glass fiber layer;
- (c) applying a resin binder solely to the side of the glass fiber layer away from the nonwoven synthetic fiber layer using a rotating roll whereby sufficient amounts of the resin binder penetrate into the glass fiber layer to secure the synthetic fibers within and on the surface of the glass fiber layer and wherein none of the binder resin enters the nonwoven synthetic fiber layer, which is free of said resin binder;
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- (d) drying the laminate.
Dependencies are inferred from the claim text.