Antislip sheet material with twisted tapes
AssigneeOwens Corning Intellectual Capital, LLC
InventorsManish K. Seth, Martin Vido
Life of this patent
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Abstract
A sheet of material suitable for roofing or industrial wrapping applications has an anti-skid surface formed by ridges of twisted tapes. The sheet comprises a woven scrim of warp tapes and weft tapes. Some of the tapes are twisted about their longitudinal axis, for example about (25) to (400) revolutions per meter, to form ridges having a height substantially greater than the thickness of the tapes. The ridges impart an anti-skid surface to the sheet. The scrim is bonded to a coating or film to make the sheet waterproof.
Claims22
A roofing underlayment having an anti-skid surface, the roofing underlayment comprising:
- a first set of tapes generally parallel to each other;
- and
- a second set of tapes generally parallel to each other and perpendicular to the first set of tapes;
- wherein tapes of the first set and tapes of the second set are plastic and have a width greater than their thickness;
- wherein the tapes of the first set are interwoven with the tapes of the second set to form a scrim;
- wherein every fourth tape of the first set is twisted between about 250 revolutions per meter and about 400 revolutions per meter about its longitudinal axis to form a first plurality of spaced apart parallel ridges;
- wherein every third tape of the second set is twisted between about 250 revolutions per meter and about 400 revolutions per meter about its longitudinal axis to form a second plurality of spaced apart parallel ridges;
- wherein the first plurality of spaced apart parallel ridges and the second plurality of spaced apart parallel ridges form an anti-skid contour of the anti-skid surface of the sheet.
A roofing underlayment having an anti-skid surface, the roofing underlayment comprising:
- a first repeating pattern of tapes comprising flat tapes and twisted tapes, wherein the tapes of the first repeating pattern are generally parallel to each other, wherein the twisted tapes of the first repeating pattern are twisted between about 250 revolutions per meter and about 400 revolutions per meter;
- a second repeating pattern of tapes comprising flat tapes and twisted tapes, wherein the tapes of the second repeating pattern are generally parallel to each other, wherein the twisted tapes of the second repeating pattern are twisted between about 250 revolutions per meter and about 400 revolutions per meter;
- wherein the tapes of the first repeating pattern are interwoven with the tapes of the second repeating pattern to form a scrim, wherein the tapes of the first repeating pattern are generally perpendicular to the tapes of the second repeating pattern;
- wherein the twisted tapes of the first repeating pattern and the twisted tapes of the second repeating pattern form an anti-skid contour of the anti-skid surface of the sheet.
Dependencies are inferred from the claim text.