Antislip sheet material with twisted tapes
AssigneeIbco Srl
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.
Claims25
A sheet of material having an anti-skid surface, comprising:
- a first set of tapes generally parallel to each other;
- a second set of tapes generally parallel to each other and perpendicular to the first set of tapes;
- a third set of tapes generally parallel to the first set of tapes;
- the tapes being plastic and having a width greater than their thickness;
- the tapes of the first set and of the third set being interwoven with the tapes of the second set to form a scrim;
- at least some of the tapes of the third set being twisted about their longitudinal axis to form a plurality of parallel ridges having a height at least five times greater than the thickness of untwisted tapes, the ridges forming the anti-skid surface of the sheet;
- at least some of the tapes of the third set being positioned adjacent to and following a weaving path the same as that of respective tapes of the first set.
A sheet of material having an anti-skid surface, comprising:
- a first set of tapes generally parallel to each other;
- a second set of tapes generally parallel to each other and perpendicular to the first set of tapes;
- the tapes being plastic and having a width greater than their thickness;
- the tapes of the first set and of the second set being interwoven with each other to form a scrim;
- at least some of the tapes of the first set being twisted about their longitudinal axis to form a plurality of parallel ridges having a height at least five times greater than the thickness of untwisted tapes, the ridges forming the anti-skid surface of the sheet;
- wherein the second set of tapes comprises both tapes that are twisted about their longitudinal axis and tapes that are untwisted, the tapes that are twisted forming a plurality of parallel ridges having a height at least five times greater than the thickness of the untwisted tapes, respective twisted tapes of the second set being spaced from each other by one or more untwisted tapes of the second set.
A sheet of material having an anti-skid surface, comprising:
- a first set of tapes generally parallel to each other;
- a second set of tapes generally parallel to each other and perpendicular to the first set of tapes;
- the tapes being plastic and having a width greater than their thickness;
- the tapes of the first set and of the second set being interwoven with each other to form a scrim;
- at least some of the tapes of the first set being twisted about their longitudinal axis to form a plurality of parallel ridges having a height at least five times greater than the thickness of untwisted tapes, the ridges forming the anti-skid surface of the sheet;
- wherein the tapes that are twisted have a width in their untwisted state that is greater than the width of the tapes that are not twisted.
A sheet of material having an anti-skid surface, comprising:
- a first set of tapes generally parallel to each other;
- a second set of tapes generally parallel to each other and perpendicular to the first set of tapes;
- the tapes being plastic and having a width greater than their thickness;
- the tapes of the first set and of the second set being interwoven with each other to form a scrim;
- at least some of the tapes of the first set being twisted about their longitudinal axis to form a plurality of parallel ridges having a height at least five times greater than the thickness of untwisted tapes, the ridges forming the anti-skid surface of the sheet;
- wherein the tapes that are twisted have a thickness in their untwisted state that is greater than the thickness of the tapes that are not twisted.
Dependencies are inferred from the claim text.