Dimensionally stable ply suitable for roofing webs or roof-sealing webs
AssigneeJohns Manville
InventorsWolfgang Greiser, Roger Souther, Bertrand Weither
Life of this patent
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Abstract
A polyester filament nonwoven ply is suitable for roofing and roof-sealing webs and has a latent shrinkage force which counteracts drafting forces which may subsequently occur as the result of stresses or during thermal processing operations. The roofing webs thus remain dimensionally stable even when exposed to heat. The shrinkage force is obtained according to the claimed process by drafting the ply accordingly in a drafting mechanism arranged after a dryer.
Claims14
A core for roofing and sealing membranes, comprising a reinforcement-free, bonded non-woven of polyester filaments which is bound by a binder and which has a latent shrinkage force of 2 N/5 cm to 20 N/5 cm.
A method of producing a reinforcement-free non-woven core of polyester filaments which is suitable as a core for roofing and sealing membranes, characterised in that a non-woven of polyester filaments is produced by the spun-bond process, the non-woven obtained in this way is bonded, is provided with a binder, is dried in a dryer and is stretched on a stretching unit positioned downstream of a dryer to an extent such that the non-woven has a shrinkage force which counteracts the strains which arise in the subsequent treatment operations which take place under heat, the shrinkage force being in a range from 2 N/5 cm to 20 N/5 cm.
A composite material comprising a core for roofing and sealing membranes, wherein the core comprises a reinforcement-free bonded non-woven of polyester filaments which is bound by a binder and which has a latent shrinkage force of 2 N/5 cm to 20 N/5 cm.
A roofing or sealing membrane comprising a core for roofing and sealing membranes, wherein the core comprises a reinforcement-free, bonded non-woven of polvester filaments which is bound by a binder and which has a latent shrinkage force of 2 N/5 cm to 20 N/5 cm.
Dependencies are inferred from the claim text.