US20160325523A1 - Antislip sheet material with twisted tapes - Google Patents
Antislip sheet material with twisted tapes Download PDFInfo
- Publication number
- US20160325523A1 US20160325523A1 US15/211,057 US201615211057A US2016325523A1 US 20160325523 A1 US20160325523 A1 US 20160325523A1 US 201615211057 A US201615211057 A US 201615211057A US 2016325523 A1 US2016325523 A1 US 2016325523A1
- Authority
- US
- United States
- Prior art keywords
- tapes
- twisted
- sheet material
- scrim
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000463 material Substances 0.000 title claims abstract description 48
- 229920001971 elastomer Polymers 0.000 claims description 5
- 238000009941 weaving Methods 0.000 claims description 5
- 239000000806 elastomer Substances 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 2
- 238000007765 extrusion coating Methods 0.000 claims 3
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 239000011247 coating layer Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 4
- 239000005043 ethylene-methyl acrylate Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 2
- HGVPOWOAHALJHA-UHFFFAOYSA-N ethene;methyl prop-2-enoate Chemical compound C=C.COC(=O)C=C HGVPOWOAHALJHA-UHFFFAOYSA-N 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003000 extruded plastic Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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Definitions
- the invention pertains to sheet materials made of plastic tapes, suitable for roofing, wrapping and other applications. More particularly, it pertains to such sheet materials having a surface with a high coefficient of friction.
- Sheet materials comprising a scrim of woven plastic tapes are commonly used for roofing and industrial wrapping applications.
- the sheet materials may be coated or uncoated. Such materials typically have a relatively smooth surface with a low coefficient of friction.
- a surface with antislip properties on which workers may walk enhances worker safety.
- an antislip surface is useful.
- the conventional methods of imparting antislip properties to sheet materials involve applying films, meshes or granules to the surface of the sheet.
- the invention provides a sheet material comprising a scrim made of woven plastic tapes, in which at least some of the tapes
- the sheet material comprising the scrim are twisted to create ridges and thus impart an enhanced coefficient of friction to a surface of the sheet.
- the sheet material provides enhanced slip-resistance in wet, dry or dusty conditions.
- the sheet material is useful for applications such as industrial wrapping, packaging and roofing underlayments.
- the invention provides a sheet of material having an anti-skid surface, 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.
- the tapes are plastic and have a width greater than their thickness.
- the tapes of the first set and of the second set are interwoven with each other to form a scrim. At least some of the tapes of the first set are 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.
- 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, and a third set of tapes generally parallel to the first set of tapes.
- the tapes are plastic and have a width greater than their thickness.
- the tapes of the first set and of the third set are interwoven with the tapes of the second set to form a scrim.
- At least some of the tapes of the third set are twisted about their longitudinal axis to faun 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.
- Each tape of the first set is positioned adjacent to and following a weaving path the same as that of a respective tape of the first set.
- FIG. 1 is a plan view of a sheet according to a first embodiment of the invention.
- FIG. 2 is a cross-sectional view on the line 2 - 2 of FIG. 1 .
- FIG. 3 a cross-sectional view of a second embodiment of the invention.
- FIG. 4 is a cross-sectional view of a third embodiment of the invention.
- FIG. 5 is a plan view of a fourth embodiment of the invention.
- the sheet material 10 has a scrim 12 coated on one side by a coating layer 14 .
- the scrim 12 is woven in a plain weave of warp tapes 16 and weft tapes 18 .
- the weft tapes 18 are laid flat in the weave, in the conventional manner.
- the warp tapes 16 are twisted, such that they describe full revolutions about their longitudinal axis along the length of the weave.
- the frequency of the twisting is about one revolution every centimeter. Preferred frequencies of such twisting are in the range of 25 to 400 revolutions per meter. Some of the twisted tapes can have different frequencies of twisting from others.
- the thickness of the tapes comprising the scrim is about 1 to 2 mils (0.025 to 0.05 mm) However, when twisted, the effective thickness of the warp tapes 16 is about 10 to 20 mils (0.25 to 0.5 mm).
- the warp tapes 16 accordingly form ridges, having a height of about 10 to 20 mils, running along the warp direction of the sheet 10 , which provide an increased coefficient of friction to the surface of the sheet.
- the height of the ridges should be at least about five times greater than the thickness of the tapes, alternatively at least about ten times greater.
- the scrim 12 and the coating 14 are made of plastic, poly olefin resins, for example polyethylene or polypropylene. They may alternatively be made of various other plastics, including polyesters, polystyrene, nylon and ethylene acrylic copolymers. Alternatively, the scrim and/or the coating 14 may comprise a high coefficient-of-friction material, for example ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), rubber or elastomer.
- EVA ethylene vinyl acetate
- EMA ethylene methyl acrylate
- the scrim provides a structural layer having high tensile and tear strength.
- the tapes 16 , 18 are conventional extruded plastic tapes having a flat profile and a width greater than their thickness.
- the tape width is preferably about 1.5 to 6 mm.
- the number of tapes per inch in the machine direction and in the cross direction is in the range of 1 to 25.
- Tapes that are to be twisted may be the same width and thickness as tapes that are not to be twisted, or they may have a greater width and/or thickness.
- the frequency of twisting of the warp tape 16 , and the thickness and denier of the tapes 16 , 18 can be selected to achieve the desired coefficient of friction of the anti-skid surface of the sheet 10 .
- the coating layer 14 is a waterproof film bonded to the scrim. It may be permeable to water vapor to allow the escape of moisture from buildings when the sheet is used as a roofing underlayment or for similar applications.
- the coating layer 14 is manufactured in-situ using a co-extrusion process and is laminated to the scrim 12 , or it can comprise a film that is bonded to the scrim, for example by thermal bonding, lamination or adhesive.
- a second coating layer is bonded to the opposite side of the scrim.
- FIG. 3 illustrates an embodiment of the invention in which twisted warp tapes are added to a scrim woven with conventional untwisted warp and weft tapes.
- the sheet material 20 comprises a scrim 22 with a coating layer 14 laminated thereto.
- the scrim 22 is woven of untwisted warp tapes 21 and untwisted weft tapes 23 in a plain weave. Twisted warp tapes 25 are woven into this scrim, the twisted warp tapes 25 being laid on top of and following the same weaving path as the untwisted warp tapes 21 , interweaving with the weft tapes 23 of the scrim.
- the twisted warp tapes 25 form a twisted warp layer 24 .
- This layer 24 comprises ridges formed by the twisted warp tapes 25 , imparting an enhanced coefficient of friction to the upper surface of the sheet 20 .
- FIG. 4 illustrates a further embodiment of the invention in which both twisted warp tapes and twisted weft tapes are added to a scrim woven with conventional untwisted warp and weft tapes.
- the sheet material 30 comprises a scrim 22 with a coating layer 14 laminated thereto.
- the scrim 22 is woven of untwisted warp tapes 21 and untwisted weft tapes 23 in a plain weave. Twisted warp tapes 25 and twisted weft tapes 27 are woven into this, the twisted warp tapes being laid on top of and following the same path as the untwisted warp tapes 21 , and the twisted weft tapes 27 being laid on top of and following the same weaving path as the untwisted weft tapes 23 .
- the twisted warp tapes 25 and twisted weft tapes 27 form a layer 26 which comprises ridges formed by the twisted warp tapes and twisted weft tapes, imparting an enhanced coefficient of friction to the upper surface of the sheet 30 .
- FIG. 5 illustrates a further embodiment of the invention in which the sheet material 40 comprises a scrim 50 with a coating layer 14 (not shown) laminated thereto.
- the scrim 50 includes twisted warp tapes 42 and twisted weft tapes 44 , and untwisted warp tapes 46 and untwisted weft tapes 48 .
- the twisted warp tapes replace every fourth untwisted warp tape, and the twisted weft tapes replace every third untwisted weft tape, in the example shown.
- the twisted tapes may be placed at different intervals, for example replacing every wrap and/or weft tape, or every second or every fifth, etc. warp and/or weft tape.
- either or both of the warp and weft tapes can be twisted; and the sheet material can be uncoated, coated on one side or on both sides; and it can include additional layers, depending on the properties desired for a particular application.
- the added twisted tapes may be in the machine direction or in the cross direction or both;
- the scrim is uncoated, or coated on one side, or coated on both sides, or includes additional layers;
- the weave of the scrim is plain, twill or other weaves
- the color of the twisted tapes is the same as the surrounding fabric to blend in with it; or it is different to make the antislip grid more visible;
- Adjacent twisted tapes have different frequencies of turning, for example some have relatively more and some have relatively fewer revolutions per meter, creating a rougher surface with ridges of different heights;
- the twisted tapes or the coating, or both are treated with or comprise a tacky or high coefficient-of-friction coating or additive.
- a tacky or high coefficient-of-friction coating or additive may incorporate ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), rubber or elastomer; and/or
- the sheet material includes additives or is treated to provide UV-resistance.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
- Woven Fabrics (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
Abstract
Description
- This application is a divisional application of U.S. Ser. No. 12/740,908 filed on Apr. 30, 2010, titled ANTISLIP SHEET MATERIAL WITH TWISTED TAPES, which is the is the U.S. national phase entry of PCT/CA08/01938, with an international filing date of Nov. 5, 2008, which claims the benefit of U.S. Provisional Patent Application No. 60/985,604, filed on Nov. 5, 2007, the entire disclosures of which are incorporated herein by reference.
- The invention pertains to sheet materials made of plastic tapes, suitable for roofing, wrapping and other applications. More particularly, it pertains to such sheet materials having a surface with a high coefficient of friction.
- Sheet materials comprising a scrim of woven plastic tapes are commonly used for roofing and industrial wrapping applications. The sheet materials may be coated or uncoated. Such materials typically have a relatively smooth surface with a low coefficient of friction. For some applications, it is useful for the sheet material to have antislip properties. For example, if the sheet is to be applied to a roof deck, e.g. as a roofing underlayment, a surface with antislip properties on which workers may walk enhances worker safety. Likewise, if the sheet material is to be use to wrap goods such as bundles of lumber, on which workers may need to walk, an antislip surface is useful. The conventional methods of imparting antislip properties to sheet materials involve applying films, meshes or granules to the surface of the sheet.
- The invention provides a sheet material comprising a scrim made of woven plastic tapes, in which at least some of the tapes
- comprising the scrim are twisted to create ridges and thus impart an enhanced coefficient of friction to a surface of the sheet. The sheet material provides enhanced slip-resistance in wet, dry or dusty conditions. The sheet material is useful for applications such as industrial wrapping, packaging and roofing underlayments.
- The invention provides a sheet of material having an anti-skid surface, 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. The tapes are plastic and have a width greater than their thickness. The tapes of the first set and of the second set are interwoven with each other to form a scrim. At least some of the tapes of the first set are 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.
- According to another embodiment of the invention, there is provided 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, and a third set of tapes generally parallel to the first set of tapes. The tapes are plastic and have a width greater than their thickness. The tapes of the first set and of the third set are interwoven with the tapes of the second set to form a scrim. At least some of the tapes of the third set are twisted about their longitudinal axis to faun 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. Each tape of the first set is positioned adjacent to and following a weaving path the same as that of a respective tape of the first set.
-
FIG. 1 is a plan view of a sheet according to a first embodiment of the invention. -
FIG. 2 is a cross-sectional view on the line 2-2 ofFIG. 1 . -
FIG. 3 a cross-sectional view of a second embodiment of the invention. -
FIG. 4 is a cross-sectional view of a third embodiment of the invention. -
FIG. 5 is a plan view of a fourth embodiment of the invention. - Exemplary embodiments are illustrated in the referenced figures of the drawings. It is intended that the embodiments are to be considered illustrative rather than restrictive.
- Referring to
FIGS. 1 and 2 , thesheet material 10 has ascrim 12 coated on one side by acoating layer 14. Thescrim 12 is woven in a plain weave ofwarp tapes 16 andweft tapes 18. Theweft tapes 18 are laid flat in the weave, in the conventional manner. Thewarp tapes 16 are twisted, such that they describe full revolutions about their longitudinal axis along the length of the weave. The frequency of the twisting is about one revolution every centimeter. Preferred frequencies of such twisting are in the range of 25 to 400 revolutions per meter. Some of the twisted tapes can have different frequencies of twisting from others. - The thickness of the tapes comprising the scrim is about 1 to 2 mils (0.025 to 0.05 mm) However, when twisted, the effective thickness of the
warp tapes 16 is about 10 to 20 mils (0.25 to 0.5 mm). Thewarp tapes 16 accordingly form ridges, having a height of about 10 to 20 mils, running along the warp direction of thesheet 10, which provide an increased coefficient of friction to the surface of the sheet. To form an effective anti-skid surface, the height of the ridges should be at least about five times greater than the thickness of the tapes, alternatively at least about ten times greater. - The
scrim 12 and thecoating 14 are made of plastic, poly olefin resins, for example polyethylene or polypropylene. They may alternatively be made of various other plastics, including polyesters, polystyrene, nylon and ethylene acrylic copolymers. Alternatively, the scrim and/or thecoating 14 may comprise a high coefficient-of-friction material, for example ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), rubber or elastomer. The scrim provides a structural layer having high tensile and tear strength. - The
tapes - The frequency of twisting of the
warp tape 16, and the thickness and denier of thetapes sheet 10. - The
coating layer 14 is a waterproof film bonded to the scrim. It may be permeable to water vapor to allow the escape of moisture from buildings when the sheet is used as a roofing underlayment or for similar applications. Thecoating layer 14 is manufactured in-situ using a co-extrusion process and is laminated to thescrim 12, or it can comprise a film that is bonded to the scrim, for example by thermal bonding, lamination or adhesive. Optionally, a second coating layer is bonded to the opposite side of the scrim. -
FIG. 3 illustrates an embodiment of the invention in which twisted warp tapes are added to a scrim woven with conventional untwisted warp and weft tapes. Thesheet material 20 comprises ascrim 22 with acoating layer 14 laminated thereto. Thescrim 22 is woven ofuntwisted warp tapes 21 anduntwisted weft tapes 23 in a plain weave.Twisted warp tapes 25 are woven into this scrim, thetwisted warp tapes 25 being laid on top of and following the same weaving path as theuntwisted warp tapes 21, interweaving with theweft tapes 23 of the scrim. Thetwisted warp tapes 25 form atwisted warp layer 24. Thislayer 24 comprises ridges formed by the twistedwarp tapes 25, imparting an enhanced coefficient of friction to the upper surface of thesheet 20. -
FIG. 4 illustrates a further embodiment of the invention in which both twisted warp tapes and twisted weft tapes are added to a scrim woven with conventional untwisted warp and weft tapes. Thesheet material 30 comprises ascrim 22 with acoating layer 14 laminated thereto. Thescrim 22 is woven of untwistedwarp tapes 21 and untwistedweft tapes 23 in a plain weave.Twisted warp tapes 25 andtwisted weft tapes 27 are woven into this, the twisted warp tapes being laid on top of and following the same path as the untwistedwarp tapes 21, and thetwisted weft tapes 27 being laid on top of and following the same weaving path as the untwistedweft tapes 23. Thetwisted warp tapes 25 andtwisted weft tapes 27 form alayer 26 which comprises ridges formed by the twisted warp tapes and twisted weft tapes, imparting an enhanced coefficient of friction to the upper surface of thesheet 30. -
FIG. 5 illustrates a further embodiment of the invention in which thesheet material 40 comprises ascrim 50 with a coating layer 14 (not shown) laminated thereto. Thescrim 50 includes twistedwarp tapes 42 andtwisted weft tapes 44, and untwistedwarp tapes 46 and untwistedweft tapes 48. The twisted warp tapes replace every fourth untwisted warp tape, and the twisted weft tapes replace every third untwisted weft tape, in the example shown. Alternatively, the twisted tapes may be placed at different intervals, for example replacing every wrap and/or weft tape, or every second or every fifth, etc. warp and/or weft tape. - In the sheet materials of the invention, either or both of the warp and weft tapes can be twisted; and the sheet material can be uncoated, coated on one side or on both sides; and it can include additional layers, depending on the properties desired for a particular application.
- Some further features and embodiments of the invention include the following:
- (a) The weft tapes are twisted and the warp tapes are untwisted;
- (b) Both the warp tapes and the weft tapes are twisted;
- (c) Each warp (and/or weft) tape is twisted, or every second or third etc. warp (and/or weft) tape is twisted and the others are untwisted;
- (d) Where twisted tapes are added to a scrim made of untwisted tapes (as in
FIGS. 3 and 4 ) the added twisted tapes may be in the machine direction or in the cross direction or both; - (e) The scrim is uncoated, or coated on one side, or coated on both sides, or includes additional layers;
- (f) The weave of the scrim is plain, twill or other weaves;
- (g) The color of the twisted tapes is the same as the surrounding fabric to blend in with it; or it is different to make the antislip grid more visible;
- (h) The twisted tapes are applied to the whole of a sheet or to only a part of it;
- (i) Adjacent twisted tapes have different frequencies of turning, for example some have relatively more and some have relatively fewer revolutions per meter, creating a rougher surface with ridges of different heights;
- (j) The twisted tapes or the coating, or both, are treated with or comprise a tacky or high coefficient-of-friction coating or additive. For example, they may incorporate ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), rubber or elastomer; and/or
- (k) The sheet material includes additives or is treated to provide UV-resistance.
- Although the invention has been described in terms of various embodiments, it is not intended that the invention be limited to these embodiments. Various modifications within the scope of the invention will be apparent to those skilled in the art. The scope of the invention is defined by the claims that follow.
Claims (25)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/211,057 US20160325523A1 (en) | 2007-11-05 | 2016-07-15 | Antislip sheet material with twisted tapes |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US98560407P | 2007-11-05 | 2007-11-05 | |
PCT/CA2008/001938 WO2009059403A1 (en) | 2007-11-05 | 2008-11-05 | Antislip sheet material with twisted tapes |
US74090810A | 2010-04-30 | 2010-04-30 | |
US15/211,057 US20160325523A1 (en) | 2007-11-05 | 2016-07-15 | Antislip sheet material with twisted tapes |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2008/001938 Division WO2009059403A1 (en) | 2007-11-05 | 2008-11-05 | Antislip sheet material with twisted tapes |
US12/740,908 Division US10124557B2 (en) | 2007-11-05 | 2008-11-05 | Antislip sheet material with twisted tapes |
Publications (1)
Publication Number | Publication Date |
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US20160325523A1 true US20160325523A1 (en) | 2016-11-10 |
Family
ID=57222284
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US15/211,038 Expired - Fee Related US10232585B2 (en) | 2007-11-05 | 2016-07-15 | Antislip sheet material with twisted tapes |
US15/211,057 Abandoned US20160325523A1 (en) | 2007-11-05 | 2016-07-15 | Antislip sheet material with twisted tapes |
US16/288,795 Abandoned US20190299563A1 (en) | 2007-11-05 | 2019-02-28 | Antislip sheet material with twisted tapes |
Family Applications Before (1)
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US15/211,038 Expired - Fee Related US10232585B2 (en) | 2007-11-05 | 2016-07-15 | Antislip sheet material with twisted tapes |
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US16/288,795 Abandoned US20190299563A1 (en) | 2007-11-05 | 2019-02-28 | Antislip sheet material with twisted tapes |
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Cited By (1)
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---|---|---|---|---|
USD828044S1 (en) * | 2015-06-10 | 2018-09-11 | Fujifilm Corporation | Lenticular lens sheet |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11865821B2 (en) | 2021-03-24 | 2024-01-09 | Ft Synthetics Inc. | Fire-resistant multi-layer membrane |
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Also Published As
Publication number | Publication date |
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US10232585B2 (en) | 2019-03-19 |
US20190299563A1 (en) | 2019-10-03 |
US20160325521A1 (en) | 2016-11-10 |
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