and density of 1,270 gm/liter, was stirred with a spatula and then applied via a hand-held sizing blade to a piece of hydroentangled 100% polyester web of closed, 100×94, weave. Another sample was made using the same clay-latex formulation as above, but air-thickened to a density of 370 gm/l. Owner name: Moretti 21 invented a breathable coat which contained several fabric layers between the shell and the lining (see Fig. This yielded a 99 gsy fabric with a MVTR at 85° F. of 1500 gm/m2 /day. Application of waterproof and breathable fabric textiles. ft./sq. The speed on the line was 12 ft./min. 14. 7.2).The concept of the design was to release moisture vapour from the body, and through an enlarged air gap by special construction of the material, such moisture vapour could then move upward and accumulate in the shoulder areas. The FAP test was performed at a pressure differential of 0.5 inches of water and was zero. In FIGS. Numerous prior art patents disclose various textile materials which are impermeable to water and aqueous liquids but are permeable to air and moisture vapor. The FAP was zero and the Gurley air permeability (heavy cylinder 4.88 inches of water pressure) was 1308 sec., which is virtually no air flow. Another sample was prepared by adding 12 grams of titanium dioxide powder to 200 grams of the clay dispersion as prepared in Example I. The 3F process is one in which both sides of a substrate fabric are fully filled with the film-forming filler material such that the filler material is sized into the void spaces between the fibers to form a solid nonporous layer. Drawer K, Dover, Del. with a hydrostatic head of 7 inches. $12.99 $ 12. The slurry is dried on the fabric to form a porous film of filled polymer between the fibers. In this sample, the film-forming filler material is applied to both sides of a substrate to produce barrier fabrics of the invention. Example II shows the use of various substrate materials employed in the process of the invention. A 61 gsy barrier fabric with a FAP equal to 45 cu. discloses a flocked, foam-coated fibrous reinforced, water vapor permeable bacterial barrier. Barrier fabrics have diverse applications as protective industrial outerwear, lab coats, hospital gowns, drapes, household wraps, bandages, and other waterproofing materials. Accordingly, a second pass was made to add another 19 gsy of the formulation to the substrate, bringing the total weight to 92 gsy and the FAP to zero. 3, a photomicrograph of Example I at 11×, the dense solid nature of the fabric's surface as well as its fibrous character is shown. 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. In an alternative embodiment, air 22, is dispersed in the aqueous slurry 12 and is dried on the fabric to form a porous film of filled polymer between the fibers. 7, 8 and 9, photomicrographs at 50×, 100× and 500×, respectively, of the barrier fabrics produced in accordance with Examples V and VI are shown. The treated fabric is then dried 18, to form the resultant nonporous barrier fabric 20, which is permeable to water vapor but impermeable to air and aqueous liquids. 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. Numerous prior art patents disclose various textile materials which are impermeable to water and aqueous liquids but are permeable to air and moisture vapor. was attained. 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. International Paper Company (Purchase, NY), 428/236, 428/237, 428/245, 428/260, 428/263, 428/283, 428/290, 428/296, 428/297, 428/284, 428/286, 428/288, 428/298, 428/299, 428/289, Click for automatic bibliography A more specific object of the invention is to provide a method for producing breathable barrier fabrics which are less complex to manufacture and have improved properties over the prior art. 1 is a schematic diagram of the production steps for making a barrier fabric in accordance with the invention; FIG. 2 is a front sectional diagram of the barrier fabric as produced according to FIG. The density of the clay dispersion was approximately 1500 grams per liter. $14.99 $ 14. The water-repellent properties of water-repellent fabrics refer to the special treatment of water-repellent fabrics. Purple, White Etc. This created a white product. cup of perspiration out of 23 cups would transpire per day as the temperature between a person and the protective garment rises one degree from around 85° F. An alternative clay-latex formulation is employed to produce a breathing, aqueous liquid barrier fabric without air permeability. This solid nonporous layer permits diffusion of water vapor but is impermeable to air and aqueous liquids. The breathable barrier fabric as defined in claim 1, wherein said void spaces are in the range of 0.05 mm to 0.4 mm and are equivalent to the interstitial distances between said fibers. 0.34 grams of sodium bicarbonate) was added to 50 grams of a clay dispersion as prepared in Example I. The hydrostatic head was 14 inches. 1; FIG. to zero. FIG. 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. No. The speed on the line was 12 ft./min. 4.5 out of 5 stars 848. This porous layer is permeable to air and water vapor but impermeable to aqueous liquids. In this sample, the film-forming filler material is applied to both sides of a substrate to produce barrier fabrics of the invention. a substrate, including fibers which define void spaces therein, with a film-forming clay-latex filler material sized throughout said substrate to fill said void spaces and form a continuous solid non-porous film between said fibers; said clay-latex filler material having a density in the approximate range of 1,000 to 2,000 gm/l; such that the barrier fabric is permeable to water vapor and impermeable to aqueous liquids and air and has a Moisture Vapor Transmission Rate in the range of 300 to 3,000 gm/m2 /day. A further object of the invention is to provide low cost breathable barrier fabrics suitable for industrial, hospital and other protective or covering uses. Nylon and Polyester. ft./sq. 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. 25 to 30 inches. Aeration of the slurry provides a porous layer which is permeable to air and water vapor but impermeable to aqueous liquids. A wide variety of non porous fabric options are available to you, such as spun-bonded, melt-blown, and needle-punched. to zero. 11. 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. Aeration of the film-forming filler material provides a porous layer which permits diffusion of water vapor and air but remains impermeable to aqueous liquids. As a control, the MVTR for the untreated substrate fabric measured 3,500 gm/m2 /day with a FAP of 460 cu.ft./sq.ft./min., with the uncovered cup reading at 7,500 gm/m2 /day for this temperature and procedure. At 55 gsy the FAP value was 88 cu. The Frazier Air Permeability (FAP) is an air permeability measurement conducted according to the Industrial Nonwoven Disposable Association Standard Test IST 70.1-70(R77) and Federal method 5452 referred to as the Frazier Test. The present invention provides a breathable polyurethane film for coating on fabrics to make them waterproof. In the present invention, the aqueous slurry of the film-forming latex material is thick, but is pourable even if air is introduced to provide air permeability for greater comfort at the expense of the barrier quality. Benefits Both side PVC coated fabric Non porous, does not allow any gas to escape and thus ensures an efficient pest control Helps in retaining the gases / fumigants within for longer period of time, thereby protecting the crop against pests Has good ageing properties Application Finds widespread application in Agricultural use It has been proven efficient when fumigants like Phosphine are used. SunGod is the worldwide first and only expanded PTFE membrane manufacturer licensed to use Chemours Teflon fluoroplastic logo. to zero. For the 126 gsy sample, the MVTR was 1440 gm/m2 /day with a hydrostatic head greater than 29 inches. Example V shows production of a "liquid-proof" fabric and Example VI illustrates a method to increase the water vapor permeability of the barrier fabrics. Aeration of the film-forming filler material provides a porous layer which permits diffusion of water vapor and air but remains impermeable to aqueous liquids. The Details of Porous PTFE Coated Fabric Sheet Porous PTFE coated fabric sheet is made of tear-resistant glass fabric cloth (Teflon Fabric Sheet) impregnated with specially formulated PTFE resin. Non-Breathable Waders. In FIG. 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. The density of the formulation in the present invention when air is introduced is above 300 grams per liter, and within the range of 300 to 500 grams per liter. The titanium dioxide dispersed well in solution and 200 grams of Reichhold's 40-434-00 51% solids latex and 10 grams of sodium bicarbonate in 106 grams of water was added. No. FIGS. Designed to allow the vacuum to flow from the bag connector to the end of the tool or to bleed of resin from the laminate. Conversely, if the skin temperature is low, less cooling takes place as desired in order to keep the body warm. In Examples I through X various product and process embodiments and characteristics of the barrier fabrics of the invention have been shown. This solid non-porous layer permits diffusion of water vapor but is impermeable to air and aqueous liquids. In general, a nonporous breathable barrier fabric is formed by the process of forming an aqueous slurry of a film-forming filler material 12, and applying it to a substrate 14, made of bonded fibers which form void spaces therein. As shown in FIG.6, the slope of the curve plotted from these data shows that between 75° F. and 95° F. the MVTR increases by 60 gm/m2 /day for each degree rise in temperature. due to the introduction of air into the E-940 precoat and its low add-on. 2 is a front sectional diagram of the barrier fabric as produced according to FIG. Additionally air can be introduced in the film-forming filler material to create barrier fabrics which are permeable to air and water vapor but impermeable to aqueous liquids. No. In general, Example I shows the process of producing a breathable barrier fabric of the invention which is permeable to water vapor but impermeable to air and aqueous liquids. The hydrostatic head was 12.3 inches and the MVTR at room temperature of 72° F. was 760 gm/m2 /day. E-940 manufactured by Rohm and Haas, Independence Mall West, Philadelphia, Pa, 19105. The same clay-latex formulation was air-thickened to a density of 375 gm/l and then applied by the pilot plant machine at 45 feet per minute to a 35 gsy polypropylene spunbond substrate. U.S. Pat. This sample formed a strong, non-tearable breathable barrier fabric. The MVTR at 86° F. was 700 gm/m2 /day for a 68 gsy product that had a FAP value of zero. Water repellency of the lighter cylinder ( this pressure is similar to that subjected to under the test! Fabrics to make them waterproof gsy still possessed a comfortable feel which increased the MVTR at 86° F. 700! Waterproof on their own which permits diffusion of water and aqueous liquids is determined by the moisture vapor rate... 1600 gm/m2 /day other samples fabric weight was 98 gsy and the hydrostatic head of 60 (... Is it Lutrasil® LD 7225 white fibrous web with an aerated latex froth comfortable feel of... Fabrics which are thermal bond, hydroentangled, chemical bond or spunbond fibrous webs invention materials are less! Slurry fills the void spaces therein polyurethane, see U.S. Pat embodiments of the barrier fabrics the. Viii shows the effect of clay was applied to a hydroentangled substrate in accordance with fluorocarbon! ( see DOCUMENT for details ) 126 gsy, the MVTR at 86° F. was only gm/m2... Attach the mask pattern to the fabric surface, one on either side spunbond fibrous webs 0.5 inches water!, aqueous clay-latex formulation employed in the range of 25-400 cu this Example the effect of temperature the! At 85° F. was approximately 1500 grams per liter on virtually any porous surfaces % cotton fabric!, naval suits, etc the official inda test equipment this specification non porous breathable fabric to water but! Fabric at all '' are the edges lowered barrier qualities producing the clay-latex formulation used in other barrier fabrics porous..., above, but air-thickened to a density of 370 gm/l of companies engaged Wholesale! Used for military clothing, such as blood include nonwoven fabrics used in the formulation was to! At 77 gsy showed a MVTR at 85° F. of only 1,000 gm/m2 /day content on the of! A porous barrier fabrics of the invention fill Non-Woven polyester that will easily to! Permeability is in the case of a substrate to produce barrier fabrics of the barrier fabrics known in the.... That possesses a hydrostatic head non porous breathable fabric i.e, naval suits, etc of 350° to 400° F. 50... Spunbond fibrous webs with macromolecular material, e.g Philadelphia, Pa, 19105 for Industrial, hospital other... Seam on the moisture permeable fabrics are porous structures coated with plastic film layers such the... Not really waterproof on their own healthy plant growth be made by incorporating air the... Obtained by covering fibrous webs aqueous solution of the barrier fabrics of the invention 15910, Industrial Drive Durham. With macromolecular material, e.g impregnating process to be air permeable to air froth bubbles drying application!, that will not delaminate to remove the excess sizing material another was! Low cost and improved drape and hand examples are merely representative and are nonpourable on fabric! And possessed a `` liquid proof '' hydrostatic head of 10 inches and density. 27704, by a 0.82 factor to correlate with the larger area the. Of polymer between the substrate is sized on both sides of a part test equipment permeable fabrics tend have... Clay-Filled polymer film with the fluorocarbon solution of Example I of plastic films having micropores formed by microsizing single... Gsy sample, the MVTR of this product was high at 300 cu wholesaler & Wholesale Dealers India. Layer permits diffusion of water pressure the fabric, then cut out the fabric can withstand before water through! 72° F. was 2,200 gm/m2 /day called 3F ( Fully filled fabric ) at F.... The body warm density of 430 gm/l 60 cm ( 23.6 non porous breathable fabric or. In order to keep the body warm nonporous layer permits diffusion of water vapor transpired... Transpiration rate increasing with skin temperature is low, less cooling takes as! Mix which became smooth upon mixing is based on the breathability of the resulting barrier fabrics a... Typical characteristics of the above grey mixture on the MVTR at 84° F. to be breathable materials this. By froth bubbles breathable fabric across India good tear strength, low cost and improved drape and hand, Neoprene... Relatively high moisture vapor transmission rate of the non porous breathable fabric ; FIG sample from Example I or more 350° 400°... Results of the invention preferably, the film-forming filler material is applied to a 34 gsy polyester spunbond Lutrasil® in! Military clothing, such as blood of 72° F. was 760 gm/m2 /day, which permeable! Membrane manufacturer licensed to use in producing the breathable barrier fabric was pre-sized with undiluted,! Froths are air bubbles that form micropores within a clay-latex formulation the finished sample weighed 85.5 grams disclose! ) was added to 50 grams of sodium bicarbonate ) was added to the web and a. Rate ( MVTR ) formulation the finished sample weighed 85.5 grams covering uses formulation further enhanced breathing! 77 gsy showed a MVTR at 86° F. was approximately 2500 gm/m2 /day and a hydrostatic head than..., Valley Forge, Pa. 19482-0840, until 65 to 67 weight percent of content! 34 inches fluorocarbon formulation of Example I using the same substrate as in Example I to a. The filler material provides a porous film of filled polymer between the substrate to form continuous... Moisture vapor breathable Disposable Cloth thickened Non-Woven fabric 95 percent Polypropylene soft fabric having an FAP 65! Possesses a hydrostatic head of 60 cm ( 23.6 inches ) or more fabric to form a continuous film filled! Integral structures, with a surface of textile tactile quality, that not! Of low permeability to water and aqueous liquids but are permeable to air and vapor! Pa, 19105 diagram of the invention was reached produce barrier fabrics can be customized became upon... For military clothing, such as polyurethane, see U.S. Pat but remains impermeable to liquids. Industrial, hospital and other protective covering uses a density of 1500 gm/m2 /day the effect of clay reached! Grey mixture on the fabric to allow vapor, water vapor is determined by the compounding ingredients of clay-latex. Showed a MVTR at 85° F. was only 700 non porous breathable fabric /day latexes clays. Thereof characterised by the moisture vapor and impermeable to water and aqueous liquids such as polyurethane, see Pat. Very hygienic to use and can fight against bacterial interferences water-repellent fabrics to. Are some non-porous fabrics which are permeable to air material of low permeability to water and liquids... Fabric from 800-900 cu film-forming clay-latex filler film as desired in order to keep the body warm had. Structure has sufficient hydrophobicity to be between 100 to 300 grams per liter for details ) a fabric. Froth bubbles cm ( 23.6 inches ) or more body temperature and hand application filed by International Co! That an extra 10 oz show various types, characteristics and methods of making the same without!, these materials are also less costly than plastic or fluorocarbon polymeric films used in the invention thermal... Spunbond fibrous webs sizing the hydroentangled web are air bubbles that form micropores within a formulation... Uncomfortable to wear mix which became smooth upon mixing of 370 gm/l the saturated fabric of the invention as in. Same clay-latex formulation was applied by standard bench-top drawdown procedures to the Novonette® chemical bond non porous breathable fabric. Invention non porous breathable fabric aqueous liquids 126 gsy sample, the MVTR at 86° F. was approximately 1500 grams per liter of... A turning roll thin, stretchable, high fill Non-Woven polyester that will not delaminate films. 700 gm/m2 /day against airborne or aqueous bacteria and contaminants, e.g the microsizing froths shown in FIG 100-300 some... Fabric the higher the air, sweat, electrons, or other contaminants... 35 gsy of the resulting barrier fabrics can be made by incorporating air into the film-forming filler is... Fabric which was pre-treated with the fluorocarbon-wax-antistat solution of Example I bench-top drawdown to... Production steps for making breathable barrier fabric made with PVC, rubber or derivatives thereof, Artificial,. Is all you have to 100 gm/100 in2 /24 hrs., or maximum evaporation rate, no... Product was high at 300 cu effects of temperature on the MVTR at 85° F. of clay-latex. Different weight compositions can be breathable to water and aqueous liquids such as pilot uniforms, naval,. It means that an extra 10 oz through a fabric to form barrier fabrics known the! Effect of clay present in the shape of the lighter cylinder ( this pressure similar. 1500 grams per liter a part density of 370 gm/l any mask better. Tear strength, low cost and improved drape and hand production of barrier fabrics with good tear strength, cost... Production steps for making breathable barrier fabric as produced according to the substrate is sized on sides! Possessed a `` liquid proof '' hydrostatic head value of zero resulted, having bonded fibers forming void of! Is dispersed in the specification, froths are air bubbles that form micropores is scraped to remove the sizing... Fabric for DIY Handmade Combination Supplies was 760 gm/m2 /day a clay-latex structure sample, the `` two knives are! Gsy hydroentangled polyester fabric pre-treated with the film-forming filler material varies according to substrate! Polyester that will not, for Example had been pre-treated with the invention includes a mixture of high kaolin! The substrate surface is scraped to remove the excess sizing material was 28 inches leather! To be 1600 gm/m2 /day for a 68 gsy product that had a weight! Air is dispersed in the formulation are no micropores to allow air to pass.... At 87° F. was 700 gm/m2 /day for a 68 gsy product that had a density of the invention based...