US 2003/0165667 A1 · Tougher, softer nonwoven sheet product

Abstract

The present invention relates to film-fibril plexifilamentary sheet products which demonstrate improved balance of toughness and softness combined with improved balance of air permeability and liquid barrier resistance, which are prepared by point bonding a nonwoven sheet on both sides by passing said sheet between embossing rolls at a combination of bonding temperature, pressure and residence time such that the majority of bond points are not bonded to the point of translucency. The present invention relates to the use of these products in rooflining materials.

Claims8

Dependent claims

A flash spun film-fibril sheet material having a basis weight of between 55 and 115 g/m2 which has been point bonded on both sides of said sheet material, wherein the bond points are not bonded to the point of translucency.

Dependencies are inferred from the claim text.

Facts

Application

10/080,800Filed 22 Feb 2002

Published

4 Sep 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

D04H 3/16
Characterised by the method of strengthening or consolidating: with bonds between thermoplastic filaments produced in association with filament…
D04H 1/724
The fibres being randomly arranged: forming webs during fibre formation, e.g. flash-spinning
Y10T 428/24479
Structurally defined web or sheet [e.g., overall dimension, etc.]: including variation in thickness
Y10T 428/2457
Including variation in thickness: parallel ribs and/or grooves

Tougher, softer nonwoven sheet product

Life of this patent

Tougher, softer nonwoven sheet product

Life of this patent

Abstract

Claims8