Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
  • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
  • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
  • D03D15/208—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads cellulose-based
  • D03D15/225—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads cellulose-based artificial, e.g. viscose
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
  • D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
  • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
  • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
  • D06C15/00—Calendering, pressing, ironing, glossing or glazing textile fabrics
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
  • D06M15/568—Reaction products of isocyanates with polyethers
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
  • D06M15/572—Reaction products of isocyanates with polyesters or polyesteramides
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
  • D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
  • D10B2201/20—Cellulose-derived artificial fibres
  • D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
  • D10B2201/24—Viscose
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/06—Load-responsive characteristics
  • D10B2401/062—Load-responsive characteristics stiff, shape retention
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/10—Physical properties porous
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/22—Physical properties protective against sunlight or UV radiation
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2507/00—Sport; Military
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2507/00—Sport; Military
  • D10B2507/04—Sails

Definitions

• Lightweight coated fabric especially for flying veil
• the present invention relates to a light fabric formed of warp yarns and continuous weft yarns, this fabric being coated on one and / or both sides with a polyurethane.
• This lightweight fabric finds its application particularly in the field of flight sails.
• the invention also relates to a method of manufacturing this fabric.
• the porosity is dependent on the density of the fabric, that is to say the number of warp and weft son per unit area.
• the porosity is also dependent on the presence of a coating intended to close more or less the pores of the fabric.
• the coating is in fact essential and is a significant part of the weight of the coated fabric and therefore the flying wing.
• the coating is an essential element to confer the porosity required, it must be durable.
• the concept of durability can cover various criteria, for example UV stability and stability to hydrolysis and therefore more generally to atmospheric conditions and water. Hydrolysis stability should be considered as the preponderant factor in the long-term preservation of porosity properties.
• Coating is also important for imparting good stiffness properties in the bias.
• flying sails such as paragliders use a polyurethane (PU) polyester base as a coating material.
• PU polyurethane
• These coatings have a relatively good resistance to UVs, they are however of limited durability with respect to stability to hydrolysis.
• the weight of the lightest coated fabrics thus produced is of the order of 45 g / m 2 .
• FR 2,840,625 discloses a stabilized fabric diagonally formed of a rip-stop weave comprising warp yarns and weft yarns which are interwoven so as to have bands and stabilizing zones. This weave is coated with an aqueous mixture of polyurethane and silicone. The physicochemical characteristics of the polyurethane are not specified and the weight of the fabric is 45 g / m 2 .
• EP 0 305 888 discloses a textile material formed of a substrate impregnated with a water-repellent agent and coated with a polyurethane resin layer modified with a polysiloxane.
• This modified resin is prepared by reaction between the siloxane polymer and the basic components of polyurethane, isocyanate and diol (polytetramethylene glycol, polyether diol, open ring lactone diols, polycarbonate diol).
• the weight of the fabrics is greater than 40 g / m 2 .
• EP 2 184 399 discloses a textile material for paragliding, comprising a polyester fiber-based fabric coated with a urethane-silicone copolymer resin layer. This material is said to have a weight of between 21 and 100 g / m 2 . The examples describe a weight equal to or greater than 45 g / m 2 .
• EP 0 552 374 describes a textile material that can be used for the manufacture of boat sails, paragliders or parachutes.
• This material comprises a polyester fabric which may optionally be coated with a resin which may be selected from polyurethane, silicone resin and polyvinyl chloride resin, without further specification of the nature of these resins or preferably. It is explicitly stated that this treatment is optional, the textile material does not need to be treated with a resin.
• the weight of the uncoated or coated fabric may be between 20 and 100, preferably between 30 and 50 g / m 2 .
• the examples describe a polyethylene terephthalate fabric coated with a polyurethane resin for a weight of 25, 48 or 85 g / m 2 .
• JP 2000234272 discloses a fabric for paragliding sail based on polyamide warp and weft threads that can be coated with a synthetic resin which can be an acrylic resin, a polyurethane resin, a silicone resin, a polyamide resin, a polyester resin, a polyimide resin, without further details on the physicochemical characteristics of the resin.
• a synthetic resin which can be an acrylic resin, a polyurethane resin, a silicone resin, a polyamide resin, a polyester resin, a polyimide resin, without further details on the physicochemical characteristics of the resin.
• the prior art has not identified the essential criteria for optimizing both the weight of the coated fabric and its porosity, as well as its mechanical properties, to obtain fabrics for the manufacture of advanced flight sails.
• the prior art has not identified the coverage rate TC as being an essential criterion. He also did not identified the importance of the choice of physico-chemical characteristics of the coating resin.
• the prior art has not known how to combine these criteria to obtain fabrics having a coating weight of low value, especially less than or equal to 40 g / m 2 .
• the prior art has also not been able to combine these different criteria to obtain optimum levels of air permeability for such a reduced weight.
• Yet another object of the present invention is to provide a method for obtaining such tissues.
• the subject of the invention is in particular a light fabric formed of continuous warp and weft yarns and coated on one and / or both sides by a polyether or polycarbonate base polyurethane having a modulus at 100% lower elongation or equal to 5 MPa (measured according to DIN 53504), the fabric having a weight, including coating, ranging from 25 to 40 g / m 2 , preferably between 31 and 36 g / m 2 and a coverage ratio TC between 1, 8 and 4, preferably between 2.6 and 3.2.
• the polyurethane has a modulus at 100% elongation less than or equal to 4 MPa, preferably less than or equal to 3 MPa. This module can thus be between 1 and 5, 4 or 3 MPa.
• the TC is that of the fabric resulting from the weaving operation, and before any calendering operation or the like.
• the TC is calculated as follows:
• the TC values selected for the invention correspond to values conferring on the fabric a sufficiently closed configuration, then accentuated by calendering, making it possible, on the one hand, to limit the wear rate of the coating material in order to obtain 'a bass guitar porosity adapted to the field of use of the fabric, and consequently, on the other hand, to limit the final weight of the coated fabric.
• the dry weight ratio of the coating material is greater than or equal to 10% by weight, in particular between 10 and 30%, preferably between 12 and 30% by weight, better still between 15 and 25%.
• the dry weight ratio is the ratio by weight of coating (in particular PU and crosslinker) dry on the coated fabric, it is representative of the weight of dried / crosslinked coating present on the final fabric.
• the fabric of the present invention is characterized by bias in the bias. Chain bias is the 45 ° direction to the warp threads.
• the weft direction bias is the direction at 45 ° with respect to the weft threads.
• the elongation in% is measured under a force of 3 pounds (Lbs, ie 1.36 kg) applied in the bias.
• This elongation characterizes the stiffness of the fabric in the bias.
• the standard used is NF EN ISO 13934-1: specimens of width 50 mm and length 300 mm are produced. The edges of the dynamometer are 200 mm apart and the measurement is made at a speed of 100 mm / min.
• the fabric according to the invention has an elongation in the warp and weft direction under 3 Lbs less than or equal to 10%.
• This elongation can thus be between 1 and 10%, preferably between 3 and 10%, better still between 5 and 10%.
• the light fabric has an air permeability less than or equal to 20 L / m 2 / min at a pressure of 2000 Pa, as measured according to the standard NFG 071 1 1 (measuring surface of 100 cm 2 ).
• the light fabric comprises warp and / or weft yarns which have a dtex of between 11 and 44 dtex and a DPF (decitex per filament) of between 1 and 4.
• the naked fabric has a weight of between 20 and 33 g / m 2 , preferably between 24 and 28 g / m 2 .
• the coated fabric has a weight of between 25 and 40 g / m 2 , preferably between 31 and 36 g / m 2 .
• the fabric comprises from 30 to 50 warp threads per cm and from 30 to 50 weft threads per cm.
• the fabric comprises yarns having filaments on a DPF (decitex per filament) of 1 to 3.
• the lightweight fabric of the present invention is obtained by coating an aqueous dispersion. polyurethane. The coating may have any of the features mentioned below.
• the subject of the invention is also a process for producing a light coated fabric, in which:
• the polyurethane has a modulus at 100% elongation less than or equal to 4 MPa, preferably less than or equal to 3 MPa.
• This module can thus be between 1 and 5, 4 or 3 MPa.
• the fabric comprises warp and / or weft threads having a dtex between 11 and 44 dtex and a DPF (decitex per filament) of between 1 and 4,
• the fabric before coating in step (b), the fabric is calendered.
• the calendering crushes the fabric and spreads the yarns and the constituent filaments, which helps to close the pores of the fabric and reduce the porosity.
• one calender s between a tool, cylinder or calender roll and a counter-platinum.
• the face of the fabric that has undergone the passage of the calendering tool, called the calender face, is smoothed with respect to the other face.
• the coating is produced on this calender face.
• the adhesion of the polymer can be improved by first applying a treatment to this smooth surface.
• primer can be a physical treatment or a chemical treatment. This is for example a chemical treatment providing functional groups capable of reacting with groups of the polymer to form chemical bonds.
• the coating is made on the other side, unsmoothed. It is understood that the rate of carriage varies according to the face concerned, this rate being higher on the unsmoothed face, which allows the skilled person to play on the amount and weight of the coating.
• one calendering between two tools, cylinders or calendering rollers Both sides of the fabric are smoothed. One or both sides are then coated, with or without hanging treatment as described above.
• the calendering is preferably carried out at a temperature of between 150 and 250 ⁇ , preferably between 180 and 210 ⁇ .
• the calendering is preferably carried out with a pressure of from 150 to 250 kg, preferably from 180 to 230 kg.
• the speed of rotation of the calender can be between 1 and 30 m / min, preferably between 10 and 20 m / min.
• the fabric used in step (a) has a weight of between 20 and 33 g / m 2 , preferably between 24 and 28 g / m 2 .
• the fabric resulting from step (c) has a weight of between 25 and 40 g / m 2 , preferably between 31 and 36 g / m 2 .
• the fabric used comprises from 30 to 50 warp threads per cm and from 30 to 50 weft threads per cm.
• the fabric used comprises threads whose filaments have a DPF (decitex per filament) of between 1 and 3.
• the lightweight fabric of the present invention is obtained by coating an aqueous polyurethane dispersion.
• the lightweight fabric of the present invention is obtained by coating a solvent-phase polyurethane dispersion.
• a polyurethane has a steep portion (isocyanate) and a flexible portion (polyol). The ratio between these two components makes it possible to obtain a more or less stiff polymer.
• a polyol type polyether or polycarbonate is stable to hydrolysis and therefore durable.
• the coating composition comprises a crosslinking agent, in particular an isocyanate or a melamine, or a mixture of both.
• isocyanate is meant both an isocyanate and a polyisocyanate, alone or in admixture with one or more other isocyanates and / or polyisocyanates.
• isocyanate should be understood herein to include the terms “isocyanate” and “polyisocyanate”.
• the proportion of dry crosslinker relative to the dry polyurethane is 5% or more than 5%, especially between 10 and 30%, by weight.
• the polyurethane is based on polyether.
• the polyether polyether base is linear or branched and comprises a polyol polyether portion and an isocyanate portion.
• the isocyanate portion is preferably aliphatic, in fact the aromatic isocyanates have the disadvantage of yellowing over time.
• the polyurethane is based on polycarbonate.
• the polycarbonate base polycarbonate is linear or branched and has a polycarbonate polyol portion and an isocyanate portion.
• the isocyanate portion is preferably aliphatic, in fact the aromatic isocyanates have the disadvantage of yellowing over time.
• the isocyanate crosslinking agent used is blocked (in particular masked isocyanate functional groups) in order to have a product having a longer pot life (“pot-life"), as is known per se. .
• pot life a product having a longer pot life
• one skilled in the art is well acquainted with the field of polyurethanes and is able to propose coating compositions in accordance with the invention and in particular for producing a coating having the appropriate elongation modulus.
• the coating step is carried out by the techniques conventionally used in the coating of textiles such as direct coating.
• direct coating is understood to mean a coating by direct application using a doctor blade or a cylinder or by an air knife, coating by a scarf, at the Meyer bar (or Champion process).
• the method comprises after step c) one or more post-treatment stage (s) giving the fabric antifouling and / or water-repellent properties.
• anti-soiling treatment treatment with anti-static and / or anti-tack products.
• water-repellent treatment means treatment with fluorinated resins with or without isocyanate extender. The water-repellent treatment is followed by a drying / crosslinking step.
• the post-treatment is applied by any method known to those skilled in the art and in particular by padding, coating, spraying or plasma treatment.
• the polyurethane used is flexible and is therefore durable with mechanical stresses. It meets the following specifications: 1 to 5 MPa according to DIN 53504
• the polymer is finely dispersed in water in the form of micrometer beads. This dispersion is stable thanks to the addition of surfactants.
• the coating deposited on the fabric dries under the action of the heat of the furnaces (evaporation of the water) and the balls collect (coalescence). We then have a microporous film. As the temperature rises in the furnaces, the balls melt and form a continuous film.
• the aqueous phase polyurethane has the intrinsic characteristics of the polymer and physicochemical characteristics related to its shaping.
• the aqueous phase polyurethane is characterized by a modulus at 100% elongation less than 5 MPa.
• the aqueous phase polyurethane can also be characterized by a concentration of the dispersion of between 30 and 60%.
• the aqueous phase polyurethane of the present invention can be characterized by a viscosity of less than 10,000 Pa.s at 23 (DIN EN ISO / A3).
• the solvent phase embodiment the polymer is dissolved in the medium and the coalescence phase is avoided. The film naturally forms during the evaporation of the solvent.
• the solvent is selected from the group consisting of aromatic solvents, alcohols, ketones, esters, dimethylformamide and n-methylpyrrolidone.
• the solvent is selected from the group consisting of toluene, xylene, isopropanol, butanol, 1-methoxypropan-2-ol, methyl ethyl ketone, acetone, butanone, and the like. ethyl acetate, dimethylformamide and n-methylpyrrolidone.
• the polyurethane solvent phase may be characterized by its concentration of between 20 and 50%.
• the polyurethane solvent phase may be characterized by a viscosity of less than 100,000 Pa.s at 23 (DIN EN ISO / A3 standard).
• the coating composition of the fabric of the present invention, an aqueous polymer dispersion, may further comprise additives.
• Said additives may be any additive commonly used in fabric coating compositions. They are especially chosen from the group consisting of viscosity modifiers, UV stabilizers, dyes, dispersants and surfactants.
• the coating comprises an anti-UV agent.
• the fabric of the present invention may be any tissue known to those skilled in the art requiring coating.
• the fabric of the present invention consists of son of synthetic or artificial material. It may be in particular polyamide, polyester or viscose.
• the invention has the advantage of using fine son and having a high number of constituent filaments. In addition to providing lightness to the fabric, this allows, at the time of coating, and especially if the latter is preceded by a step of spreading the fibers by calendering, substantially reduce the porosity of the fabric before coating, this which makes it possible to reduce the polymer load and therefore the relative weight of the coating, and in the end it also makes it possible to reduce the final weight of the fabric, while having good properties in terms of porosity and durability.
• the fabric is made of warp yarns and weft yarns having different mechanical characteristics.
• the invention also relates to a lightweight fabric that can be obtained by implementing the method according to the invention.
• This type of fabric can be advantageously used as a flying veil, especially paragliding, which requires mechanical strengths, resistance to weather conditions and significant resistance over time.
• the fabric of the invention advantageously has a high durability, especially a high water stability. This stability can be assessed by different accelerated aging methods, described in the examples section:
• porosity after mechanical stress it must remain preferably less than 40, preferably 20 L / m 2 / min under 2000 Pa;
• the fabrics according to the invention can find application in all applications where the weight gain, durability, especially water stability, and porosity has an advantage.
• the invention thus relates to an article such as a paraglider sail, comprising or fabricated from a fabric according to the invention.
• Chain yarn 22 dtex with a DPF of 1, 7
• Material of the yarns polyamide, polyester or viscose
• Coverage rate 2.8 The calendering is carried out at a temperature of between 180 and 210, at a pressure of between 180 and 230 kg, and at a speed of between 10 and 20 m / min.
• the coating is performed by squeegee, and is followed by a drying step (at a temperature between 90 and 120), then a crosslinking step (temperature between 140 and 210).
• the speed is between 10 and 30 m / min.
• This post treatment is applied by padding, then drying (temperature between 90 and 120), followed by crosslinking (temperature between 140-210), speed between 10 and 30 m / min.
• Chain yarn 22 dtex with a DPF of 1, 7
• the calendering is carried out at a temperature of between 180 and 210 ° C., at a pressure of between 180 and 230 kg, and at a speed of between 10 and 20 m / min.
• the coating is performed by squeegee and then a drying step (temperature between 90 and 120 ° C) / crosslinking (temperature between 140-210 ° C) is performed.
• the speed is between 10 and 30 m / min.
• the fabric then undergoes a water repellent treatment (0.5 g / m 2 ):
• This post treatment is applied by padding, followed by drying (temperature between 90 and 120 ° C) / crosslinking (temperature between 140-210 ° C), speed between 10 and 30 m / min.
• the fabric obtained at a weight of 34 g / m 2 weight of the fabric before coating 27.7 g / m 2 , the contribution of the water-repellent treatment to the final weight of the fabric is approximately 0.5 g / m 2 )
• the elongation in% is measured under a force of 3 pounds (Lbs) applied in the bias. This elongation characterizes the stiffness of the fabric in the bias.
• the standard used is NF EN ISO 13934-1. Specimens of width 50 mm and length 300 mm are produced. The edges of the dynamometer are 200 mm apart and the measurement is made at a speed of 100 mm / min. Elongation in the skew direction under 3 Lbs 6.0%
• the aging of the fabric is also measured by different methods.
• the porosity of the fabric is measured after 4 cycles of 1 hour of washing with water at 30 ⁇ . Ideally the porosity after treatment should be less than 70 L / m 2 / min.
• the porosity is also measured after mechanical stressing. To carry out this measurement, the fabric fixed on a mill-type assembly is floated at high speed (4-blade assembly, the fabric being fixed at the end of one of the blades). Ideally the porosity after 1 h 30 of treatment should be less than 40 L / m 2 / min, preferably less than 20 L / m 2 / min.
• the porosity of the fabric after hydrolysis is also measured. To do this we place the fabric for 4 hours in a pressure cooker pressure cooker with water at temperature and operating pressure. 1 hour of float treatment is then applied as determined above and the porosity of the final fabric is measured. Ideally the porosity after treatment should be less than 70 L / m 2 / min. Results: Porosity at nine 1 L / m 2 / min under 2000 Pa.
• Porosity after hydrolysis plus float 9 L / m 2 / min under 2000 Pa.
• Porosity after 90 min of floats between 10 and 14 L / m 2 / min under 2000 Pa.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Woven Fabrics (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42124425

Family Applications (1)

Country Status (12)

Cited By (4)

Families Citing this family (1)

Citations (5)

• 2009
  • 2009-10-05 FR FR0956929A patent/FR2950903B1/fr not_active Expired - Fee Related
• 2010
  • 2010-10-05 ES ES10777052.1T patent/ES2651917T3/es active Active
  • 2010-10-05 EP EP10777052.1A patent/EP2486185B1/fr active Active
  • 2010-10-05 HU HUE10777052A patent/HUE037278T2/hu unknown
  • 2010-10-05 WO PCT/FR2010/052094 patent/WO2011042653A1/fr active Application Filing
  • 2010-10-05 PT PT107770521T patent/PT2486185T/pt unknown
  • 2010-10-05 PL PL10777052T patent/PL2486185T3/pl unknown
  • 2010-10-05 KR KR1020127011627A patent/KR101765730B1/ko active IP Right Grant
  • 2010-10-05 BR BR112012007776-7A patent/BR112012007776B1/pt active IP Right Grant
• 2012
  • 2012-04-17 IN IN3306DEN2012 patent/IN2012DN03306A/en unknown
  • 2012-04-17 ZA ZA2012/02811A patent/ZA201202811B/en unknown
• 2017
  • 2017-11-14 HR HRP20171757TT patent/HRP20171757T1/hr unknown

Patent Citations (6)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events