US20140242355A1 - Reversible Camouflage Material - Google Patents

Reversible Camouflage Material Download PDF

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Publication number
US20140242355A1
US20140242355A1 US13/781,062 US201313781062A US2014242355A1 US 20140242355 A1 US20140242355 A1 US 20140242355A1 US 201313781062 A US201313781062 A US 201313781062A US 2014242355 A1 US2014242355 A1 US 2014242355A1
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United States
Prior art keywords
microporous film
layer
reversible article
reversible
article
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
Application number
US13/781,062
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English (en)
Inventor
Matthew J. Castille
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by WL Gore and Associates Inc filed Critical WL Gore and Associates Inc
Priority to US13/781,062 priority Critical patent/US20140242355A1/en
Assigned to W. L. GORE & ASSOCIATES, INC. reassignment W. L. GORE & ASSOCIATES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CASTILLE, MATTHEW J.
Priority to PL14798649T priority patent/PL2962059T3/pl
Priority to PCT/US2014/015970 priority patent/WO2014186009A2/en
Priority to CA2900496A priority patent/CA2900496C/en
Priority to EP18155670.5A priority patent/EP3336480B1/en
Priority to PL18155670T priority patent/PL3336480T3/pl
Priority to KR1020157024867A priority patent/KR101860619B1/ko
Priority to CN201480010940.7A priority patent/CN105026878A/zh
Priority to JP2015560196A priority patent/JP6334571B2/ja
Priority to RU2015140999A priority patent/RU2611277C1/ru
Priority to EP14798649.1A priority patent/EP2962059B1/en
Publication of US20140242355A1 publication Critical patent/US20140242355A1/en
Priority to HK16104873.6A priority patent/HK1216923A1/zh
Priority to US15/203,830 priority patent/US10330442B2/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H3/00—Camouflage, i.e. means or methods for concealment or disguise
    • F41H3/02—Flexible, e.g. fabric covers, e.g. screens, nets characterised by their material or structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
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    • B32B27/00—Layered products comprising a layer of synthetic resin
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    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
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    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/18—Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
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    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/02—Synthetic macromolecular particles
    • B32B2264/0214—Particles made of materials belonging to B32B27/00
    • B32B2264/0257—Polyolefin particles, e.g. polyethylene or polypropylene homopolymers or ethylene-propylene copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
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    • B32B2571/00—Protective equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/2481—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including layer of mechanically interengaged strands, strand-portions or strand-like strips
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249978—Voids specified as micro
    • Y10T428/24998—Composite has more than two layers

Definitions

  • the present invention relates generally to camouflage materials, and more specifically, to a reversible camouflage material that demonstrates controlled reflectance in both the nIR and SWIR regions of the electromagnetic radiation spectrum on both sides of the garment while demonstrating high breathability on both sides of the material.
  • Camouflage textile materials used by hunters and by the military typically provide camouflage in the visible region of the electromagnetic radiation spectrum (400-700 nm). Due to the vastly diverse environments throughout the world, many different camouflage materials exist, including both visibly camouflaged and non-visibly camouflaged materials. The variety of environments (e.g., ranging from woodland to desert) necessitates the use of a variety of colors and patterns to create these camouflage textile materials. For instance, in a military woodland camouflage, the materials often use four colors: black, coyote, khaki, and green.
  • Textiles with visible camouflage patterns are typically manufactured by printing the camouflage pattern on an undyed (greige) textile (e.g., woven, knit, non-woven, etc.) surface or by solution dying yarns that are subsequently woven or knitted into a camouflage pattern using, for instance, a jacquard process.
  • grey textile e.g., woven, knit, non-woven, etc.
  • nIR near infrared
  • SWIR short wave infrared
  • Typical night vision equipment amplifies low intensity electromagnetic radiation in the visible, nIR, and SWIR spectra, with specific sensitivity in the nIR and SWIR.
  • camouflage in the nIR and SWIR spectra enables the material, and thus the wearer or covered structure, to blend in with the environment.
  • a primary difference is that, unlike the visible camouflage, nIR and SWIR camouflage does not involve a further segmentation of discrete bands of the spectrum (that in the visible gives rise to color separation).
  • effective camouflage in the nIR and SWIR spectra requires a material to have an appropriate balance of reflection, or reflectance, and transmittance/absorbance over the whole nIR and SWIR spectra.
  • the ability to detect and identify an object using image intensifiers also depends on the ability to disrupt the silhouette or the shape of the object.
  • a further challenge in creating camouflage textiles which are suitable for the applications described is the need for comfort of the user.
  • comfort in a variety of weather conditions requires that the textiles, and resulting articles, be liquidproof and breathable for optimum comfort.
  • providing environmental protection by coating or lamination of liquidproof, breathable films or coatings can also affect the visible, nIR, and SWIR camouflage properties of the textile.
  • the PTFE film often increases the overall reflectivity, in the nIR spectrum, and possibly the visible spectrum as well, resulting in undesirable tradeoffs between durable environmental protection and nIR and SWIR camouflage.
  • the infrared suppressive performance on one surface of the reversible article is different from the opposing surface of the reversible article.
  • the first textile layer is adhered to the first microporous film and the second textile layer is adhered to the second microporous film.
  • the first and second microporous films may be expanded polytetrafluoroethylene.
  • the oleophobic layer is a fluoroacrylate oleophobic coating and the infrared suppressive additive is carbon.
  • the inventive camouflage material demonstrates camouflage concealment in the near IR (nIR) and short wave infrared (SWIR) wavelengths of the electromagnetic spectrum on both sides of the material.
  • both surfaces of the reversible article demonstrate an average reflection less than about 75% or less in the wavelength range from about 700 nm to about 900 nm and an average reflection less than about 85% in the wavelength range from about 900 nm to about 1700 nm.
  • the second microporous film contains at least one infrared suppressive additive within the microporous film.
  • the infrared suppressive additive is distributed throughout the microporous film.
  • a first adhesive layer bonds the first textile layer to the first microporous film and a second adhesive layer bonds the second textile layer to the second microporous film.
  • the infrared suppressive performance on one surface of the reversible article is different from the opposing surface of the reversible article. Additionally, the moisture vapor transmission rates of the opposing surfaces of the reversible article are substantially the same.
  • the second microporous film is treated with differing levels of infrared suppressive additives to create multiple regions of reflection.
  • It is yet another object of the present invention to provide a reversible article that includes (1) an infrared suppressing layer including a polyurethane layer sandwiched between a first microporous film and a second microporous film having thereon a coating composition containing at least one colorant and at least one infrared suppressive additive where the second microporous film forms a first outer surface, (2) a textile layer positioned on the first microporous film where the textile layer forms a second outer surface, and (3) an adhesive layer positioned between the textile layer and the first microporous film.
  • the coating composition includes a sufficient amount of colorant to colorize the second microporous film and infrared suppressive additives to achieve nIR and SWIR reflectance.
  • the printed microporous film is colorized on at least 90% of the outer film surface.
  • the infrared suppressive performance on one surface of the reversible article is different from the opposing surface of the reversible article.
  • the first and second microporous films may be bonded together via a continuous or a discontinuous adhesive.
  • first microporous film and the second microporous film may form the center structure in the absence of an adhesive.
  • the first microporous film has thereon a coating that contains at least one infrared suppressive additive.
  • the first and second microporous films may be expanded polytetrafluoroethylene.
  • the two outer surfaces of the reversible material have differing infrared reflectivity.
  • the reversible materials are highly breathable and lightweight.
  • both a desert camouflage and a woodland camouflage are present in a single, reversible article that demonstrates camouflage concealment in the near nIR and SWIR wavelengths of the electromagnetic spectrum on both sides of the article.
  • nIR and SWIR reflectance can be tailored by altering the amount of infrared suppressive additive present in the ePTFE layer.
  • FIG. 1 is a schematic illustration of a reversible camouflage material including a center structure that includes a polyurethane layer sandwiched between a first microporous film and a second microporous film and two outer facing textile materials according to one exemplary embodiment of the invention;
  • FIG. 2 is a schematic illustration of a reversible camouflage material including an infrared suppressing layer that includes a polyurethane layer sandwiched between a first microporous film and a second microporous film having thereon a coating composition that contains at least one colorant and at least one infrared suppressive additive according to another exemplary embodiment of the invention;
  • FIG. 3 is a schematic illustration of a reversible camouflage material including an infrared suppressing layer that contains two ePTFE layers adhered via a discontinuous adhesive;
  • FIG. 4 is a schematic illustration of a reversible camouflage material including an infrared suppressing layer that contains two ePTFE layers adhered via a continuous adhesive;
  • FIG. 5 is a schematic illustration of a reversible camouflage material including an infrared suppressing layer that contains two ePTFE layers bonded without an adhesive.
  • the invention relates to a reversible camouflage material that has a woodland camouflage print on one side of the material and a desert camouflage print on the opposing side of the material.
  • the inventive camouflage material demonstrates camouflage concealment in the near IR (nIR) and short wave infrared (SWIR) wavelengths of the electromagnetic spectrum.
  • nIR near IR
  • SWIR short wave infrared
  • the camouflage material is both highly breathable and lightweight.
  • the material is particularly suitable for making reversible camouflage garments such as jackets and pants.
  • FIG. 1 illustrates a reversible camouflage material 10 according to at least one embodiment of the present invention.
  • the reversible material 10 is a three-layer structure formed of a first textile layer 20 having a woodland camouflage print thereon, an expanded polytetrafluoroethylene (ePTFE) substrate 30 (infrared suppressing layer), and a second textile layer 40 having a desert camouflage print thereon.
  • the ePTFE substrate contains a polyurethane layer 60 sandwiched between a carbon-containing ePTFE layer 50 and an ePTFE layer 70 .
  • the carbon-containing ePTFE layer 50 may be coated with carbon or the carbon may be positioned throughout the ePTFE layer.
  • the polyurethane layer 60 acts as an adhesive to bond the two ePTFE layers 50 , 70 together.
  • ePTFE membranes having a thickness from about 0.2 mil to about 5.0 mil may be utilized. In at least one exemplary embodiment, the ePTFE membrane thickness is less than or equal to 2.0 mil, or less than or equal to 1.0 mil.
  • the infrared suppressive performance is different from one side of the reversible material to the opposing side.
  • the phrase “infrared suppressive performance” as used herein is meant to denote that the outer surfaces of the reversible camouflage material have different nIR and SWIR reflective camouflage performance. For example, one surface may be nIR and SWIR reflective for a dry soil environment and the opposing surface may be nIR and SWIR reflective for a foliage environment.
  • FIGS. 3 and 4 illustrate a reversible material 150 that contains a center structure 35 (infrared suppressing layer) where the carbon-containing ePTFE layer 50 and the ePTFE layer 70 are bonded by a discontinuous adhesive 85 .
  • a reversible material 160 where a continuous adhesive 95 bonds the carbon-containing ePTFE layer 50 and the ePTFE layer 70 is depicted in FIG. 4 .
  • FIG. 5 depicts a reversible material 170 where the carbon-containing ePTFE layer 50 and the ePTFE layer 70 are bonded together without an adhesive.
  • expandable fluoropolymers include, but are not limited to, expanded PTFE, expanded modified PTFE, expanded copolymers of PTFE, fluorinated ethylene propylene (FEP), and perfluoroalkoxy copolymer resin (PFA).
  • Patents have been filed on expandable blends of PTFE, expandable modified PTFE, and expanded copolymers of PTFE, such as, but not limited to, U.S. Pat. No.
  • Porous membranes including polymeric materials such as polyolefins (e.g., polypropylene and polyethylene), polyurethanes, polyesters, polyamides, polyvinyls, polyvinyl chlorides, acrylics, silicones, epoxies, synthetic rubbers, other thermoset polymers, and copolymers of these types are considered to be within the purview of the invention provided that the polymeric material can be processed to form porous or microporous membrane structures.
  • polymeric materials such as polyolefins (e.g., polypropylene and polyethylene), polyurethanes, polyesters, polyamides, polyvinyls, polyvinyl chlorides, acrylics, silicones, epoxies, synthetic rubbers, other thermoset polymers, and copolymers of these types are considered to be within the purview of the invention provided that the polymeric material can be processed to form porous or microporous membrane structures.
  • One method of accomplishing nIR and SWIR reflectance within the reversible material 10 is by coating or imbibing the carbon into or on the film surface.
  • Carbon is used herein for ease of discussion. It is to be appreciated that any infrared suppressive additive can be used in place of, or in addition to, the carbon.
  • any conventional application method may be employed to place a coating composition containing carbon onto the carbon-coated ePTFE layer 50 .
  • Application methods for coating the ePTFE layer 50 with carbon include but are not limited to, transfer coating, screen printing, gravure printing, ink-jet printing, and knife coating.
  • Additional topical treatments can be applied to the ePTFE layer 50 , provided sufficient porosity throughout the ePTFE substrate 30 is maintained to remain moisture vapor transmissivity.
  • an oleophobic treatment such as a fluoroacrylate oleophobic coating, may be applied to the ePTFE layer 50 . It is to be appreciated that the oleophobic treatment may be applied in conjunction with the application of carbon, or prior to or subsequent to the application of the carbon coating.
  • a near infrared suppressive additive that can decrease the nIR and SWIR reflectivity of the substrate 30 while maintaining a light shade visible appearance. It is to be noted that a range of additives suitable for decreasing the nIR and SWIR reflectivity are available and can be used in place of, or in addition to, the carbon described above.
  • Non-limiting exemplary additives include inorganic materials such as, but not limited to, metals, and metal oxides, metal compounds, such as, but not limited to, aluminum, aluminum oxide, antimony, antimony oxide, titanium, titanium oxide, cadmium selinide, gallium arsenide, and the like, and organic materials such as, but not limited to, conductive polymers and those described in U.K. Patent Application No. GB 2,222,608A.
  • the infrared suppressive material/additive(s) that provide the nIR and SWIR suppression can either be soluble in the polymeric matrix or exist as discrete particles. In either instance, the infrared suppressive additives should be uniformly or substantially uniformly dispersed in the polymeric matrix.
  • Infrared suppressive additive loadings onto and/or into the carbon-containing ePTFE layer 50 can be varied depending on the combination of properties desired. For example, carbon levels on the order of about 1% by weight have been surprisingly found to be effective in nIR and SWIR suppression while simultaneously providing excellent shade retention in the articles. Infrared suppressive additive(s) in an amount from about 1% to about at least 15% by weight, or more, may be present in the carbon-containing ePTFE layer. In the presence of other reflective materials (e.g., TiO 2 and the like) in the carbon-containing ePTFE layer 50 , higher loadings of carbon can be used to achieve the desired balance of absorption and reflectance in the nIR, SWIR, and visible spectra.
  • other reflective materials e.g., TiO 2 and the like
  • the carbon-containing ePTFE layer 50 is treated with differing levels of infrared suppressive additives to create multiple regions of reflection (analogous to camouflage printing of textiles). This allows for the incorporation of a nIR/SWIR disruptive pattern into the film layer.
  • the pattern applied or achieved by the application of the infrared suppressive additive could be altered in a variety of ways to achieve the particular nIR and/or SWIR disruptive pattern desired.
  • the carbon-containing ePTFE layer 50 It is important that the carbon-containing ePTFE layer 50 not exhibit too dark of a shade in the visible light spectrum. For instance, if the nIR suppressive layer is too dark, it will alter the shade of the desert camouflaged textile behind which it is located.
  • the first and second textile layers 20 , 40 are bonded to the ePTFE substrate 30 by adhesive layers 80 , 90 , respectively.
  • the first textile layer 20 is positioned adjacent to the ePTFE layer 70 and the second textile layer 40 is positioned adjacent to the carbon-containing ePTFE layer 50 .
  • Any suitable process for joining the ePTFE substrate 30 and the first and second textile layers 20 , 40 may be used, such as gravure lamination, fusion bonding, spray adhesive bonding, and the like.
  • the adhesive may be applied discontinuously or continuously, provided that breathability through the camouflage material 10 is maintained.
  • the adhesive may be applied in the form of discontinuous attachments, such as by discrete dots, or in the form of an adhesive web to adhere the first and second textile layers 20 , 40 to the PTFE substrate 30 together.
  • the first and second textile layers 20 , 40 may be formed of a woven, knit, or non-woven material, and it may be comprised of materials such as, but not limited to cotton, rayon, nylon, polyester, and blends thereof.
  • the weight of the textile forming the first and second textile layers 20 , 40 is not particularly limited except as required by the application.
  • the textile is air permeable.
  • the textile layers 20 , 40 are printed with a woodland camouflage pattern and a desert camouflage pattern, respectively.
  • the ink used for printing the camouflage patterns contains nIR suppressive materials such as carbon to aid in nIR and SWIR camouflage.
  • Application methods for printing the surface of the textile layers 20 , 40 include but are not limited to, transfer coating, screen printing, gravure printing, ink-jet printing, and knife coating.
  • the reversible material is formed of a first textile layer 20 having a woodland camouflage print thereon and an infrared suppressing layer 120 .
  • the infrared suppressing 120 contains an adhesive layer 60 sandwiched between a printed ePTFE layer 100 and an ePTFE layer 70 .
  • the adhesive layer may be polyurethane.
  • a coating composition that includes a colorant to colorize the ePTFE layer 100 and infrared suppressive additives to achieve nIR and SWIR reflectance is applied to the outer surface of the printed ePTFE layer 100 .
  • the coating composition coats or encapsulates the nodes and/or fibrils of the expanded fluoropolymer structure forming a durable aesthetic appearance.
  • Aesthetic durability can be achieved in some embodiments with colorant coating compositions that comprise a pigment having a particle size sufficiently small to fit within the pores of the porous substrate. Pigment particles having a mean diameter of less than about 250 nm are useful for forming durable color.
  • Coating compositions may further comprise a binder capable of wetting the porous substrate and binding the pigment to the pore walls. Additional treatments may be provided to impart a desired functionality to the ePTFE layer 100 . As one non-limiting example, oleophobic treatments may be applied to render the ePTFE layer 100 oleophobic.
  • the printed ePTFE layer 100 is colorized on at least 90% of the outer film surface. Any of the conventional printing techniques described herein may be utilized to print the outer surface of the ePTFE layer 100 so long as the ePTFE substrate 120 maintains moisture vapor transmission.
  • the surface of the film can be colorized with a colorant to form a solid color or a pattern (design).
  • Coating compositions comprising colorants can be applied to provide a variety of colors and designs, such as solid, camouflage, and various print patterns. Additionally, the coating compositions may include one or more colorants suitable for use in printing camouflage patterns, such as woodland and desert patterns.
  • the coating composition including highland, light coyote, urban tan, and light tan colorant suitable for printing a desert camouflage pattern.
  • Other compositions that include colorants shade variations are considered within the purview of the invention.
  • Moisture vapor transmission, or breathability, is important to provide cooling to a wearer of the outerwear apparel made from reversible materials described herein.
  • Fabric textiles described herein are breathable and have a moisture vapor transmission rate (MVTR) that is greater than about 4500 g/m 2 /24 hours, greater than about 8000 g/m 2 /24 hours, greater than about 12000 g/m 2 /24 hours, or greater than about 16000 g/m 2 /24 hours when tested according to the MVTR Test Method described herein.
  • the moisture vapor transmission rate of the reversible material is the surprisingly the same or substantially the same on both sides for the embodiment depicted in FIG. 1 and described herein.
  • the reversible materials are also lightweight, and may have a mass/area less than about 300 g/m 2 , less than about 200 g/m 2 , less than about 100 g/m 2 , or less than about 65 g/m 2 .
  • nIR and SWIR reflectance that is neither too high nor too low.
  • a nIR and SWIR reflectance that is too high relative to the surrounding environment creates a bright silhouette under night vision.
  • a reflectance that is too low creates a dark silhouette relative to the surrounding environment under night vision.
  • nIR/SWIR disruptive pattern there will typically be areas that are very nIR and/or SWIR suppressive and areas that are only moderately reflective. It is to be understood that the optimum reflectance levels varies with the environment.
  • the reversible materials described herein demonstrate nIR and SWIR suppression of incident electromagnetic radiation in the nIR and SWIR wavelength range on both sides of the material. Such nIR and SWIR suppression is particularly useful because reduced reflectivity in these wavelength ranges reduce the visibility of an article when viewed in the dark with a night vision scope.
  • the nIR absorption characteristic of the reversible materials provide an average reflection of about 75% or less in the wavelength range of about 700 nm to about 900 nm.
  • the nIR absorption characteristic may be tailored to provide an average reflection of less than about 65%, less than about 55%, or less than about 45% in the wavelength range of about 700 nm to about 900 nm.
  • the SWIR absorption characteristic of the reversible materials provides an average reflection from about 10% to about 85% in the wavelength range of about 900 nm to about 1700 nm.
  • the nIR absorption characteristic may be tailored to provide an average reflection of less than about 85%, less than about 75%, or less than about 65% in the wavelength range of about 900 nm to about 1700 nm.
  • the level of reflectance preferred for any particular environment is dependent on the reflectance of the background that lies behind the article to be hidden by the reflective material.
  • a background of trees and leaves is known in the art to have a nIR reflectance between about 45% and 55% and a SWIR reflectance between about 5% and 65%.
  • an article of the present invention can be tailored to have a reflectance that closely matches that of a treed background (or other background), the article will appear less visible when viewed in the dark through a night vision instrument.
  • one unique aspect of the inventive reversible materials is that the infrared suppressive additives are decoupled from the visible camouflage in the printed surface so that the visible camouflage shades can be retained within desired specifications while simultaneously providing the necessary nIR and SWIR suppressive characteristics.
  • the reversible materials described herein are suitable for use in various applications, including but not limited to forming reversible garments (e.g. jackets, pants, ponchos, raincoats), tents, covers, bivy bags, and the like.
  • the reversible material 10 exhibits high breathability on both sides of the material.
  • the reversible materials demonstrate both nIR and SWIR reflectance on both sides of the garment to enable the reversible material to blend into the background and provide optimal camouflage.
  • Spectral reflectance data shall be determined on both sides of the fabric laminate and shall be obtained from 600 to 1700 nanometers (nm), for Woodland print, and 700 to 1700 nm, for Desert print, at 20 nm intervals from 700 to 860 nm and at 100 nm intervals from 900 to 1700 nm, on a spectrophotometer relative to the barium sulfate standard, the preferred white standard.
  • Other white reference materials may be used provided they are calibrated to absolute white, e.g. magnesium oxide or vitrolite tiles.
  • the spectral band width shall be less than 26 nm at 860 nm. Reflectance measurements may be made by either the monochromatic or polychromatic mode of operation.
  • the spectrophotometer When the polychromatic mode is used, the spectrophotometer shall operate with the specimen diffusely illuminated with the full emission of a source that simulates either CIE source A or CIE source D65.
  • the specimen shall be measured as a single layer, backed with six layers of the same fabric and shade. Measurements shall be taken on a minimum of two different areas and the data averaged. The measured areas should be at least 6 inches away from the selvage.
  • the specimen shall be viewed at an angle no greater than 10 degrees from the normal, with the specular component included. Photometric accuracy of the spectrophotometer shall be within 1 percent and wavelength accuracy within 2 nm.
  • the standard aperture size used in the color measurement device shall be 0.3725 inches in diameter.
  • Any color having spectral reflectance values falling outside the limits in four or more of the wavelengths, in the 700-860 nm range, specified shall be considered a test failure (as per MIL-PRF-32142 and MC/PD 11-2011 SYSCOM A).
  • the MVTR for each sample was determined in accordance with the general teachings of ISO 15496 except that the sample water vapor transmission (WVP) was converted into MVTR moisture vapor transmission rate (MVTR) based on the apparatus water vapor transmission (WVPapp) and using the following conversion.
  • WVP sample water vapor transmission
  • MVTR moisture vapor transmission rate
  • MVTR (Delta P value*24)/((1 /WVP )+(1+ WVP app value))
  • specimens were conditioned at 73.4 ⁇ 0.4° F. and 50 ⁇ 2% rH for 2 hrs prior to testing and the bath water was a constant 73.4° F. ⁇ 0.4° F.
  • the MVTR for each sample was measured once, and the results are reported as g/m 2 -24 hours.
  • a reversible garment material was constructed in the following manner.
  • a 30 denier (30D) by 30 denier (30D) printed, woven woodland MARPAT camouflage fabric with carbon incorporated into the ink used in the printing process is bonded as follows:
  • a three-layer film composite approximately 0.27 mm thick was obtained consisting of a polyurethane layer sandwiched between two ePTFE layers.
  • This laminate was constructed in accordance with the general teachings of U.S. Pat No. 5,418,054 to Sun except that no phosphorous or other flame-retardant material was incorporated into the polyurethane layer.
  • a fluoroacrylate, carbon-containing coating to aid in controlling nIR reflectance, as generally taught in U.S. Patent Publication No. 2007/0009679 to Holcombe, et al. was then applied to one side of the film laminate in order to render it oleophobic while preserving the microporous structure.
  • both sides of the reversible garment material were treated with a waterproofing agent.
  • the construct met the spectral nIR reflectance specifications as set forth below in MIL-PRF-32142 (for Woodland print) and MC/PD 11-2011 SYSCOM A (for Desert print). Also, the construct demonstrated SWIR reflectance that closely matched the encountered background (dry soil and foliage), indicating that the reversible construct was effective in camouflaging the construct.
  • a seam tape was made in the following manner.
  • a 30D by 30D desert MARPAT camouflage woven fabric was obtained. Carbon was incorporated into the ink of the darker, colors used in the printing process.
  • the camouflage fabric was bonded in a similar fashion as the described previously to the fluoroacrylate, carbon-containing side of a bicomponent ePTFE/PU film (to aid in controlling nIR and SWIR reflectance), as generally taught in U.S. Patent Publication No. 2007/0009679, and then the film side of this structure was subsequently completely coated with'polyurethane.
  • a reversible garment material was constructed in the following manner.
  • a 30D by 30D printed, woven woodland MARPAT camouflage fabric with carbon incorporated into the ink used in the printing process is bonded as follows:
  • a three-layer film composite approximately 0.17 mm thick was obtained consisting of a polyurethane layer sandwiched between two ePTFE layers.
  • This laminate was constructed in accordance with the general teachings of U.S. Pat. No. 5,418,054 to Sun except that no phosphorous or other flame-retardant material was incorporated into the polyurethane layer.
  • the construct demonstrated nIR and SWIR reflectance that closely matched the encountered background (dry soil and foliage), indicating that the reversible construct was effective in camouflaging the construct.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Laminated Bodies (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
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US13/781,062 2013-02-28 2013-02-28 Reversible Camouflage Material Abandoned US20140242355A1 (en)

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US13/781,062 US20140242355A1 (en) 2013-02-28 2013-02-28 Reversible Camouflage Material
EP14798649.1A EP2962059B1 (en) 2013-02-28 2014-02-12 Reversible camouflage material
KR1020157024867A KR101860619B1 (ko) 2013-02-28 2014-02-12 리버서블 위장 소재
JP2015560196A JP6334571B2 (ja) 2013-02-28 2014-02-12 リバーシブル迷彩材料
CA2900496A CA2900496C (en) 2013-02-28 2014-02-12 Reversible camouflage material
EP18155670.5A EP3336480B1 (en) 2013-02-28 2014-02-12 Reversible camouflage material
PL18155670T PL3336480T3 (pl) 2013-02-28 2014-02-12 Dwustronny materiał kamuflażowy
PL14798649T PL2962059T3 (pl) 2013-02-28 2014-02-12 Dwustronny materiał kamuflażowy
CN201480010940.7A CN105026878A (zh) 2013-02-28 2014-02-12 双面式伪装材料
PCT/US2014/015970 WO2014186009A2 (en) 2013-02-28 2014-02-12 Reversible camouflage material
RU2015140999A RU2611277C1 (ru) 2013-02-28 2014-02-12 Двусторонний камуфляжный материал
HK16104873.6A HK1216923A1 (zh) 2013-02-28 2016-04-28 雙面式偽裝材料
US15/203,830 US10330442B2 (en) 2013-02-28 2016-07-07 Reversible camouflage material

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WO2020150322A1 (en) * 2019-01-15 2020-07-23 Nevoa Life Sciences Ultraviolet (uv) radiation-reflective material, system, and method
US20220112382A1 (en) * 2019-01-31 2022-04-14 Saab Ab Winter camouflage comprising hexagonal boron nitride
US11932780B2 (en) * 2019-01-31 2024-03-19 Saab Ab Winter camouflage comprising hexagonal boron nitride
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US11662180B1 (en) 2020-12-17 2023-05-30 Milliken & Company Thermal camouflage fabric
US11606984B1 (en) 2020-12-17 2023-03-21 Milliken & Company Thermal camouflage fabric with zones

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JP6334571B2 (ja) 2018-05-30
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US20160320161A1 (en) 2016-11-03
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PL3336480T3 (pl) 2021-08-23
KR101860619B1 (ko) 2018-05-23
EP3336480A1 (en) 2018-06-20
EP2962059A4 (en) 2016-10-05
RU2611277C1 (ru) 2017-02-21
CA2900496C (en) 2017-11-07
CA2900496A1 (en) 2014-11-20
HK1216923A1 (zh) 2016-12-09
EP2962059B1 (en) 2020-10-14

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