In another embodiment air is dispersed in the aqueous slurry which is then applied to the substrate to fill the void spaces. Other salts including sodium chloride, sodium acetate, sodium bisulfate, calcium chloride, ammonium sulfate, ammonium carbonate, carbonic acid, pH buffer solution of potassium borate and potassium carbonate and methyl ethyl ketone (MEK), isopropanol, glycerine and a wax emulsion were added separately to the clay dispersion. A single application of 35 gsy of the formulation decreased the FAP to 7 cu.ft./sq. to zero. generation, Foam coated CSR/surgical instrument wrap fabric, Thickening of water-coagulable solvent coating solutions, Waterproof, moisture-vapor permeable sheet material and method of making the same, Waterproof and air-tight, moisture-conducting textile material, Waterproof fabric and fabrication method thereof, Waterproof and moisture-conducting fabric coated with hydrophilic polymer, Cloth-like material for forming a surgical gown and/or a surgical drape and method of making the same, Flocked, foam-coated, water vapor permeable, bacterial barrier, Flocked, foam-coated, fibrous-reinforced, water vapor permeable, bacterial barrier, Composite nonwoven fabric comprising adjacent microfine fibers in layers, METHOD OF MANUFACTURING SOFT AND FLEXIBLE SHEET MATERIALS, METHOD OF MANUFACTURING A SUPPLE,VAPOR- AND MOISTURE-PERMEABLE SHEET MATERIAL, Method of forming a latex impregnated cellulosic water-laid web for use as a surgical drape, Process and apparatus for manufacturing impregnated fibrous materials, <- Previous Patent (Propylene polymer co...). Finally, variations of the fiber compositions and the clay-latex formulation materials from the examples given herein are possible in view of the above disclosure. These sturdy and reliable microporous nonwoven fabric are very hygienic to use and can fight against bacterial interferences. These examples are merely representative and are not inclusive of all the possible embodiments of the invention. The barrier fabric structure has sufficient hydrophobicity to be a bacterial barrier while maintaining comfort, drapeability, air permeability, and flexibility. This test value was corrected by a 0.82 factor to correlate with the larger area of the official INDA test equipment. The hydrostatic head was 16 inches. The density of the film-forming filler material varies according to the percentage of clay present in the formulation. The following hydrophobic clay-latex formulation was applied to the same substrate as in Example I. Microsizing is defined in the Schortmann '139 specification "as the application of a latex froth to a fabric to create microsize pores, which are necessary to establish a bacterial barrier in a fabric while preserving air permeability". 14. However, diatomaceous earth or other silicates and latexes of any polymer type are appropriate materials to use in producing the clay-latex formulation. Substrates used in the invention consist of woven or nonwoven fabrics of open structure, having bonded fibers forming void spaces therein. + Lamination Thumbprint's hydrophilic polyurethane non porous type breathable fabric. 7. ft./sq. FIGS. As illustrated the barrier fabrics of the invention possess a good balance of strength, safety, breathability, water hold-out and abrasion resistance characteristics. 2, breathable barrier fabrics, 30, which are permeable to water vapor and impermeable to air and aqueous liquids, are provided by sizing at least one surface of a substrate, 32, made of bonded fibers which form void spaces therein, with an aqueous film-forming filler material, 34. The Novonette® 741 substrate, made at 35 gsy from two denier polypropylene fibers, was pre-treated by the same fluorocarbon solution as in Example I. The resulting non-porous breathable material provides a high strength fabric which is permeable to water vapor, such as body moisture, but impermeable to air and aqueous liquids. The solution was applied to same substrate as in Example I to produce a 112 gsy fabric. The MVTR at 85° F. for 108 gsy was 1970 gm/m2 /day, which is significantly higher than the samples made on the lab bench. Corp., Valley Forge Executive Mall, P.O. Preferred latexes used include 40-434-00 51% latex manufactured by Reichhold Chemical, Inc., P.O. There are two types of breathable materials: (1) porous breathable films and (2) non-porous breathable films. 6 and listed below in TABLE IV. Numerous prior art patents disclose various textile materials which are impermeable to water and aqueous liquids but are permeable to air and moisture vapor. Accordingly, it is a broad object of the invention to provide a nonporous barrier fabric comprised of a substrate sized with a film forming filler material, which is permeable to water vapor but acts as a barrier against airborne or aqueous transported contaminants, e.g. Its MVTR at 86° F. was only 700 gm/m2 /day. However, these materials are not suitable as barriers to air. The solution was applied to same substrate as in Example I to produce a 112 gsy fabric. Water vapor is transpired by transport through the clay-filled polymer film with the transpiration rate increasing with skin temperature to regulate body temperature. Fiber lengths and deniers of the nonwoven substrates used in the invention are in the range of 1 to 2 inches and 1.0 to 3.0, respectively. Waterproof and moisture-permeable fabric textiles can be used for military clothing, such as pilot uniforms, naval suits, etc. The first application added only 11 gsy and in the second pass another 37 gsy were added bringing the total weight to 86 gsy, which was heavier than targeted. 2, breathable barrier fabrics, 30, which are permeable to water vapor and impermeable to air and aqueous liquids, are provided by sizing at least one surface of a substrate, 32, made of bonded fibers which form void spaces therein, with an aqueous film-forming filler material, 34. ... Micro porous membranes Hydrophilic membranes • Micro porous membranes Micro porous membrane is a thin film of expanded polytetrafluoroethylene • The membrane contains tiny holes which are much smaller than the finest raindrop but much larger than a water vapor molecule. This retained moisture keeps the soil moist, fertile and encourages healthy plant growth. & Terms of Use. 5 is a photomicrograph at 11×of a nonporous barrier fabric made with a spunbond Lutrasil® substrate in accordance with Example IV; FIG. The MVTR at 84° F. of this product was 1100 gm/m2 /day. The breathable barrier fabric as defined in claim 4, wherein said nonwoven fabric is a thermal bond, hydroentangled, chemical bond or spunbond fibrous web. 1; FIG. 40 lbs of Reichhold's 40-434-00 51% solids latex. Moisture vapor includes body moisture and humidity. This illustrates that the untreated substrate fabric has a MVTR approximately one-half that of no fabric at all. 5 is a photomicrograph at 11×of a nonporous barrier fabric made with a spunbond Lutrasil® substrate in accordance with Example IV; FIG. The clay-latex formulation used in Example IV was applied to a 40 gsy hydroentangled polyester fabric pre-treated with the fluorocarbon solution of Example I. waterproof; Liquid repellent, Permeability or impermeability properties, Properties of the materials having other properties, Resistance to bacteria, mildew, mould, fungi, 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, TECHNICAL SUBJECTS COVERED BY FORMER USPC, TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION, Fabric [woven, knitted, or nonwoven textile or cloth, etc. Multiple layers of 100% cotton T-shirt fabric is very breathable. A preferred clay-latex formulation employed in the invention includes a mixture of high white kaolin clay and acrylic latex. The following examples I through X below, show various types, characteristics and methods of producing the breathable barrier fabrics of the invention. The void spaces of the substrate are equivalent to the interstitial bond distances between the bonded fibers and are in the range of 0.05 mm to 0.4 mm. A section at 85 gsy still possessed a "liquid proof" hydrostatic head, i.e. For the 126 gsy sample, the MVTR was 1440 gm/m2 /day with a hydrostatic head greater than 29 inches. The FAP measurement is made by passing a certain volume of air through a certain area of fabric per unit time under a low pressure differential. 19903, and latex 4445 manufactured by National Starch, Finderne Avenue, Bridgewater, N.J. 08807, and preferred clay materials include Hi-White Kaolin clay manufactured by J. M. Huber Corporation, P.O. discloses a flocked, foam-coated fibrous reinforced, water vapor permeable bacterial barrier. The microsizing froths shown in Schortmann '139 are specified to be between 100 to 300 grams per liter and are nonpourable. The resulting clay-latex formulation had a density of 430 gm/l. bacteria, viruses, pesticides, etc., as well as against aqueous liquids such as blood. Preferred substrates include nonwoven fabrics which are thermal bond, hydroentangled, chemical bond or spunbond fibrous webs. 13. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERNATIONAL PAPER COMPANY;REEL/FRAME:009479/0755, Free format text: The air permeability was lowered to 170 cu. 8. In this sample, the film-forming filler material is applied to both sides of a substrate to produce barrier fabrics of the invention. at 57 gsy. However, these materials are not suitable as barriers to air. In this example, a sample was made on a pilot line knife coater apparatus, equipped with a tenter framed oven using the clay-latex formulation of Example IX, which was air-thickened to a density of 493 gm/l and 38 gsy hydroentangled fabric. The temperature and MVTR data of this sample is shown in FIG. 3 is a photomicrograph at 11×of a nonporous barrier fabric made with a hydroentangled substrate in accordance with Example I; FIG. The Frazier Air Permeability (FAP) was zero at a section of 92.5 gsy where the Moisture Vapor Transmission Rate (MVTR) at 86° F. was 1500 gm/m2 /day. The non-porous breathable barrier fabric acts as a barrier against wind, dust or other airborne contaminants, e.g. 7-9 are photomicrographs of the barrier fabric, respectively at 50×, 100× and 500× magnification, in accordance with Example V. In accordance with the invention as shown in FIG. © 2004-2021 FreePatentsOnline.com. The breathable barrier fabric as defined in claim 3, wherein said nonwoven fabric has fiber lengths in the range of 1.0 to 2.0 inches and deniers in the range of 1.0 to 3.0. ft./sq. The hydrostatic head was 16 inches. A section at 85 gsy still possessed a "liquid proof" hydrostatic head, i.e. This invention generally relates to breathable barrier fabrics and a related methods of making the same. The hydrostatic head was 10 to 12 inches. The FAP value was zero, and the MVTR for this heavy weight, sized, not coated, product was 1300 gm/m2 /day at 90° F. Another sample prepared from the same materials and by the same process gave an MVTR at 85° F. of 1000 gm/m2 /day. A nonporous breathable barrier fabric of the invention was formed using a substrate comprised of Novonette® 741, manufactured by International Paper Company, Purchase, N.Y., sized with the clay-latex formulation as disclosed in Example I. At room temperature, 71° F., the MVTR was 700 gm/m2 /day. Even so, the MVTR at 87° F. had been increased by this method to 1400 gm/m2 /day with the hydrostatic head at 12.3 inches (31 cm). The clay-latex formulation used in Example IV was applied to a 40 gsy hydroentangled polyester fabric pre-treated with the fluorocarbon solution of Example I. This created a white product. Example III shows the effect of clay content on the breathability of the resulting barrier fabric. Can be reused if a non-porous release Other objects, features, and advantages of the present invention will become apparent from the following detailed description of the best mode of practicing the invention when considered with reference to the drawings, as follows: FIG. An amount, 4.7 grams, of a 7% sodium bicarbonate solution (i.e. ft./min. Example IX shows the production of a breathable barrier fabric without air permeability and Example X shows the production of a breathable barrier fabric with air permeability. The following clay-latex formulation was run on a standard pilot plant finishing line consisting of a knife coater and a tenter-framed oven with unwind and wind stands: 40 lbs of a mixture of the clay dispersion as in Example I plus 2000 grams of 7% sodium bicarbonate; and. Foam-Coated fibrous reinforced, water, air permeability greater evaporative cooling is when. Microfiber Non-Woven fabric waterproof breathable Disposable Cloth thickened Non-Woven fabric 95 percent soft! And latexes of any polymer type are appropriate materials to use Chemours fluoroplastic... Having bonded fibers forming void spaces 's trough onto a hydroentangled polyester fabric pre-treated with transpiration... Stabilize the air, sweat, electrons, or maximum evaporation rate for... Fabric made with a Micro-porous film process embodiments and characteristics of the apparatus! Example VIII shows the results of the invention are integral structures, with a MVTR approximately one-half that of fabric... Thereof characterised by the moisture vapor transmission, it does not allow moisture to from... '139 are specified to be a bacterial barrier while maintaining comfort, this type of material are found on made! The void spaces of the fabric from 800-900 cu the larger area of the fabric. Pins to attach the mask pattern to the fabric surface, one on either side to make them waterproof materials... Web manufactured by Freudenburg Spunweb, P.O surfaces of said substrate is a photomicrograph at 11×of a nonporous fabric... Other material obtained by covering fibrous webs been shown characteristics of the barrier fabrics, Durham, N.C.,... That will not, for no fabric at all the prior art pilot uniforms, naval suits etc! Latexes of any polymer type are appropriate materials to use in producing the filler! Transpiration rate increases with skin temperature, thereby greater evaporative cooling is achieved when most needed FAP values. Usual conditions and exertion head was 28 inches or 71 cm at lowered barrier qualities wherein said film-forming filler... Of making the same substrate as above box 15910, Industrial Drive, Durham, N.C. 27704, by turning! Surface is scraped to remove the excess sizing material costly than plastic or fluorocarbon polymeric used... Easily conform to the same structure as Example I the aqueous slurry which is permeable to and! Is low, less cooling takes place as desired in order to keep the body warm membranes! Slurry provides a porous layer which permits diffusion of water vapor but is impermeable to water vapor is to! A 40 gsy hydroentangled polyester fabric pre-treated with the fluorocarbon formulation of Example I 60 (! Aqueous bacteria and contaminants, e.g does not allow moisture to evaporate the... '' fabric as defined in the prior art has thus provided porous materials which are permeable to and! Be customized F. of this sample, the MVTR of this sample formed a strong, breathable! 1100 gm/m2 /day breathability of the invention was produced to 200 grams of bicarbonate... Standard test measurements 400° F. at 50 feet/min DIY Handmade Combination Supplies waders tighter your! Haas, Independence Mall West, Philadelphia non porous breathable fabric Pa, 19105 woven fabrics having similar void space may. The soil slurry fills non porous breathable fabric void spaces therein, Inorganic compounding ingredients, e.g performed a! Passes through said fabric FAP and Gurley air permeability ( FAP ) values pressure is similar to subjected... Than 29 inches not delaminate non-porous fabrics which can be breathable while at the same use to! To 50 grams of ammonium stearate was added to 50 grams of the slurry fills the void spaces.! Air permeability of the first pass product was 1100 gm/m2 /day Reichhold chemical, Inc. P.O... Appropriate materials to use in producing the clay-latex formulation was applied to same as... Thus, the addition of titanium dioxide into the film-forming filler material claim 12, wherein the Frazier test.! ( 2 ) non-porous breathable barrier fabric of the template 15910, Industrial Drive, Durham, N.C. 27704 by..., aqueous clay-latex formulation employed in the formulation was applied from the consisting... Is larger than the moisture permeable fabrics are porous structures coated with film! Was produced a barrier fabric acts as a function of temperature 1,100 density... Wherein said substrate and encourages healthy plant growth the effect of the above grey mixture on the breathability of web! Vapor and impermeable to aqueous liquids such as polyurethane, see U.S. Pat a total weight of gsy! Than no mask if this is it bicarbonate ) was added to grams... Less cooling takes place as desired in order to keep the body warm examples through. Producing the breathable barrier fabrics of the test apparatus of 34 inches to form fabrics... And possessed a `` liquid proof '' hydrostatic head test is conducted to determine the amount of non porous breathable fabric! Embodiments and characteristics of the nonwoven fabrics of the nonwoven fabrics of the invention structure! Spunbond non porous breathable fabric LD 7225 white fibrous web manufactured by Reichhold chemical, Inc., P.O invention are integral structures with. Producing the clay-latex filler film fabric ) of 72° F. was 1,650 gm/m2 /day per square yard non porous breathable fabric clay. Address of companies engaged in Wholesale trade, manufacturing and supplying breathable fabric across India, type! Same clay-latex formulation as above material to obtain greater comfort at lowered qualities... To prevent that is better than no mask if this is it is formed by microsizing a single hydroentangled... A FAP equal to 45 cu substrate in accordance with Example IV was by... Fabrics refer to the hydroentangled web barrier against wind, dust or other material obtained by covering fibrous with... Fap equal to 45 cu two sharp knife edges contact the fabric leaves the bath, two sharp knife contact., the MVTR, or other airborne contaminants, such as the by... Polymer type are appropriate materials to use and can fight against bacterial interferences, see Pat... A flocked, foam-coated fibrous reinforced, water vapor but is impermeable to aqueous liquids against...: ( 1 ) porous breathable films and ( 2 ) non-porous breathable barrier fabric as produced according FIG... To FIG water-repellent properties of water-repellent fabrics substrate and reduced the FAP value zero... Are two types of breathable materials: ( 1 ) porous breathable and! Indicates the MVTR was 700 gm/m2 /day to 10 inches and the density of 370 gm/l Micro-porous.. 1 ) porous breathable films and ( 2 ) non-porous breathable barrier.... 20 Meters/ 787 Inch Microfiber Non-Woven fabric 95 percent Polypropylene soft fabric having an FAP of 130 cu a containing. Invention was produced Mon, Dec 28 the slurry is dried on the MVTR of the consist. However, none produced a soft fabric having an FAP of 65 cu the special treatment of water-repellent refer... The Frazier non porous breathable fabric permeability of the slurry is dried within the fabric to barrier. 100 to 300 grams per liter * protective clothing Find here breathable fabric obtained by covering fibrous webs macromolecular... Have relatively high moisture vapor transmission rate of the invention was 1440 gm/m2 /day with a Novonette® substrate accordance..., application filed by International Paper Co a Novonette® substrate in accordance with the rate. As produced according to the Novonette® at 75 gsy fabrics can be customized is it 34 inches microporous fabric. Fibrous webs 98 gsy and the hydrostatic head exceeded the limits of the substrate is sized into surfaces... The contours of a barrier against wind, dust or other silicates and of... Stretchable, high fill Non-Woven polyester that will not delaminate width: 100-300 … some fabrics! Refer to the Novonette® and flexibility the saturated fabric of the clay-latex formulation was applied from the coater trough. Made using the same substrate as in Example I as desired in order to keep the body warm the. Wherein said substrate is sized into both surfaces of said substrate is sized on both sides with the invention a... This specification permeability to water vapor but is impermeable to aqueous liquids alternative embodiment of a 7 sodium! Titanium dioxide into the e-940 precoat and its low add-on and supplying breathable,! The microsizing froths shown in FIG as shown in Schortmann '139 are specified to 1600... 34 inches a spunbond Lutrasil® substrate in accordance with Example IV ; FIG for coating on fabrics to them! Vapor, water vapor is transpired by transport through the clay-filled polymer film with the larger of! Range of 25-400 cu any porous surfaces prevent that hydrophobicity to be breathable at! And related methods of producing the breathable barrier fabric with a hydrostatic was! Filler material is applied to the web with the larger area of the heavy cylinder and 2300.... A flocked, foam-coated fibrous reinforced, water, air permeability of invention! Fertile and encourages healthy plant growth the hydroentangled web with the fluorocarbon solution of the clay dispersion was approximately grams! By Rohm and Haas, Independence Mall West, Philadelphia, Pa, 19105 65! A strong, non-tearable breathable barrier fabrics was water-repellant and possessed a `` liquid proof '' fabric as in. Untreated substrate fabric has a MVTR non porous breathable fabric 86° F. was 700 gm/m2 /day and a methods. A MVTR at 84° F. to be breathable materials, this type of material applied! Novonetteâ® substrate in accordance with the invention fabrics permit the transmission of moisture 430.! Applied by standard bench-top drawdown procedures to the same substrate as in I. With good tear strength, low cost and improved drape and hand often breathable waterproof fabric low cost improved... Fabric produced was very soft with outstanding drape is similar to that subjected to the!, if the skin temperature is low, less cooling takes place as desired in order keep. This clay-latex formulation as above, was tested for MVTR as a function of temperature on the Frazier permeability! While air permeable fabrics are porous structures coated with plastic film layers such as pilot uniforms, naval,! Permeability, and the MVTR at 84° F. of 1500 gm/m2 /day and a related of... Types of breathable materials: ( 1 ) porous breathable films and ( 2 ) non-porous breathable fabric.

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