US20140234592A1 - Flame Protective Fabric Structure - Google Patents
Flame Protective Fabric Structure Download PDFInfo
- Publication number
- US20140234592A1 US20140234592A1 US14/182,545 US201414182545A US2014234592A1 US 20140234592 A1 US20140234592 A1 US 20140234592A1 US 201414182545 A US201414182545 A US 201414182545A US 2014234592 A1 US2014234592 A1 US 2014234592A1
- Authority
- US
- United States
- Prior art keywords
- flame
- fabric
- fiber
- fibers
- fabric structure
- 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
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- D03D15/12—
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- D03D15/513—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 properties of the yarns or threads heat-resistant or fireproof
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- A—HUMAN NECESSITIES
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- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
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Definitions
- the invention relates to a flame protective fabric structure comprising a fabric being formed with yarns, the yarns made of a fiber blend of at least a first fiber component and a second fiber component, the first fiber component comprising flame resistant viscose fibers and the second fiber component comprising meltable fibers.
- the invention also relates to a clothing article comprising such flame protective fabric structure.
- Fabrics particularly for clothing, with flame protective properties are desired. They are typically used in so-called Personal Protective Equipment (PPE) for protection in working environment like for firefighting. It is often essential that work clothing fulfill a protective function, such as flame resistance, in order to protect the wearer of the work clothing from dangerous environmental conditions, such as fire and heat.
- PPE Personal Protective Equipment
- material structures for heat- and flame-resistant clothing produced from specific fibers or yarns, such as aramide, which are particularly suited for fire-protective clothing often provide reduced wearing comfort and often can only be dyed with considerable difficulty or not at all with common dying methods.
- there is a strong need for environmental preferable fibers e.g. with preferable LCA (life cycle analysis).
- FR full flame retardant
- inert FR fiber blends e.g. aramides, Polybenzimidazol (PBI), Modacryl and FR Viscose
- Nomex III Defender M (Lenzing (viscose FR) 65%, para aramide 25%, Nylon 10%), aramide/viscose blends
- post FR treated cellulosic fiber blends with low percentage of meltable fibers examples: Westex INDURA (R) Ultra Soft (R).
- a thermal protective knit fabric In WO 2009/012266 there is disclosed a thermal protective knit fabric. It has been discovered therein that a knit fabric exhibiting effective thermal protective characteristics, including the absence of melting or dripping, may be achieved when the fabric is comprised of an intimate blend of cellulosic and nylon staple fibers. Such a fabric may be used to particular advantage to offer protection against severe thermal events to the wearer of a garment made from that fabric.
- the fabric may comprise blended cellulosic and nylon staple yarn characterized by a weight ratio of cellulosic to nylon within said yarn ranging from about 55:45 to about 85:15.
- One embodiment of the fabric may contain yarn having a ratio of cellulose to nylon within the yarn of from about 60:40 to about 70:30.
- Certain yarns made from intimate blends of nylon and cellulosic staple fibers can be knit to provide fabrics particularly suitable for the manufacture of garments.
- Cellulosic fibers are derived from linear long-chain polymer polysaccharide consisting of linked, beta glucose units.
- Cellulosic fibers include naturally occurring fibers, such as cotton, flax, hemp, jute, ramie and synthetically manufactured fibers, such as rayon (regenerated cellulose), FR (fire resistant) rayon, acetate (cellulose acetate), triacetate (cellulose triacetate), etc.
- the weight percentage of the cellulosic fiber exceeds the weight percentage of nylon fiber.
- Fabric structures with full flame retardant (FR) protection (Index III according to ISO 15015) used in PPE are known.
- FR flame retardant
- Such fabric structures are made of fiber or fiber blends comprising aramides, PBI, or modacrylics which are difficult to dye and expensive.
- Especially the dying of such fibers/fiber blends involves a more complex process to ensure that all fiber components are covered with dyestuff and that the dyestuff is durably and permanently bonded to the fibers.
- US 2012/0270456 A1 discloses a flame retardant fabric for use in personal protective clothing which provides a high level of protection from flames or other sources of heat characterized in that it is made from a mixture of a primary yarn which is a blend of FR cellulosic fibers with high temperature resistant polymer fibers and a secondary yarn which is a twisted yarn containing a continuous synthetic filament yarn.
- the high temperature resistant polymer fibers are chosen from para-aramide, meta-aramide, PBI and blends of these fibers which are difficult to dye and expensive.
- the fabric is constructed so that the secondary yarn occurs in the warp and the weft at a predetermined frequency, resulting in a rough mesh structure formed by the secondary yarn.
- a carrier For dyeing of Aramide blends, a carrier is unavoidable.
- Another way of designing easy to dye fabrics is double face technology, whereby an easy to dye fiber component is mainly on the surface of the fabric and the reinforcement and FR components are in a second layer, e.g. “full option” Kermel blend.
- full option Kermel blend
- One object of the invention is to provide a flame protective fabric structure with improved protection properties such to achieve an improved non-melt performance and preferably good dye ability and color quality.
- the present invention provides a flame protective fabric structure according to claim 1 and a clothing article comprising such flame protective fabric structure according to claim 16 .
- the dependent claims refer to embodiments of said fabric structure and clothing article.
- a flame protective fabric structure comprising a fabric being formed with multiple yarns, wherein each of the yarns is made of a fiber blend of at least a first fiber component and a second fiber component, the first fiber component comprising flame resistant (FR) viscose fibers in an amount of at least 50% of the fiber blend weight and the second fiber component comprising meltable fibers in an amount of at least 10% of the fiber blend weight.
- the fabric is formed as a woven fabric with a total fractional cover factor of greater than 60% having a capability to withstand a horizontal flame exposure of 10 seconds without hole formation according to ISO 15025/14116_Index III.
- the invention provides the advantage that a woven fabric structure based on a fiber blend of FR viscose fibers and meltable fibers can withstand high temperatures, thus providing flame protection.
- the melting component particularly the melting polymer component reinforces the fiber structure of the viscose fibers, thus strengthening the fabric structure itself until the flame and heat exposure stops.
- the woven fabric structure with a total fractional cover factor of greater than 60% ensures the required tightness and density of the fabric structure to hinder a break open in the flame exposure. Therefore, it provides, as a result of the particular combination of its constitutional and constructional features, a capability to withstand a horizontal flame exposure of 10 seconds without hole formation according to ISO 15025/14116-Index III.
- a woven fabric refers to a fabric formed by weaving. Weaving is a process of fabric forming by the interlacement of warp and weft yarns. Both warp and weft yarns run essentially straight and parallel to each other, either lengthwise (warp) or crosswise (weft). Woven fabric only stretches diagonally on the bias directions (between the warp and weft directions), unless the threads are elastic.
- the total fractional cover factor is ⁇ 60%, preferably greater than 65%. It has been found that such cover factor results in obtaining a reproduceable flame resistancy over a high number of fabrics.
- the fabric with such blend of fiber components in the yarns does not show the typical melting behaviour, since the molten component of the yarn is taken up by the viscose fibers of the yarn, and does not show dripping and a sticky behaviour after cooling.
- the FR viscose fiber component of the fiber blend is able in case of heat exposure to hold/store the molten fiber component within its fiber structure.
- the flame protection by the FR component in the FR viscose fiber is sufficient to stop the afterflame and afterglow.
- the FR viscose fibers and the meltable fibers are homogeneously distributed within the blend of the yarns of the fabric.
- meltable fibers like polyamide has the advantage of providing sufficient reinforcement of the viscose fibers, good dyeability and color quality. Especially when the meltable fibers melt upon flame exposure, they contribute to stabilizing the viscose fibers so that these may maintain their flame protection properties upon flame exposure over a longer time.
- Using an amount of at least 50% FR viscose fibers has the advantage of providing sufficient amount to take up the molten component, a good flame protection and the use of the moisture management capabilities of viscose fibers.
- textile structures based on FR viscose can withstand high temperatures until the meltable fibers, such as PA polymer, start decomposition, wherein the melting polymer is used to reinforce the grid structure of the FR viscose fibers and strengthening the package until the flame and heat exposure stops.
- meltable fibers such as PA polymer, start decomposition
- the meltable fiber component or fibers can be provided with flame retardant additives for increasing the flame resistance. However, it is not required to add flame retardant additives into the meltable fiber component, but it is possible to do so.
- Meltable fibers are fiber materials that are meltable when tested according to the Melting and Thermal Stability test. According to an embodiment, in accordance with the Melting and Thermal Stability Test such meltable fibers have a melting temperature of less than 268° C.
- the meltable fibers are made of polyamide (optionally including inert FR additive), preferably of polyamide 6.6, Alternatively PP (polypropylen), and/or PE (polyethylen) may be used.
- Polyamide 6.6 has a melting temperature in the range of 255-260° C.
- polyamide 6 has a melting temperature in the range of 215-220° C.
- polypropylen has a melting temperature in the range of 160-175° C.
- polyethylen has a melting temperature in the range of 105-135° C.
- Polyamide fibers are popular in fabrics applications because they are easy to dye, have a high abrasion resistance, are easy to manufacture and cheap in comparison to other fibers.
- polyamide fibers are not used in flame protective applications as the LOI of polyamide is with 22 too low for flame retardant performance on its own and the fibers show melting, dripping; afterglow; afterburn and hole formation in flame tests.
- There is a broad range of other known additional or continuative textile manufacturing processes which are easy to adopt e.g. sanfor, brushing, calendring, etc.).
- the inventive fabric structure comprises at least on barrier layer adjacent to one side of the fabric. It was found that a combination of the fabric structure and at least one barrier layer can deliver a multilayer arrangement which protects against open flame according to ISO 15025 A for 10 seconds (Full FR Protection).
- the fiber blend comprises the flame resistant viscose fibers and the meltable fibers in a weight ratio of 80:20.
- the above advantages are particularly well observable with a fabric having blended fibers containing 80% viscose FR fibers and 20% polyamide fibers.
- the fabric is formed as a woven fabric or textile with a total fractional cover factor of greater than 60%. It provides, as a result of the particular combination of its constitutional and constructional features, a capability to withstand a horizontal flame exposure of 10 seconds without hole formation according to ISO 15025/14116_Index III.
- the fabric structure performs as full FR protective layer and remains its non melt performance, and shows no visible molten droplets after FR exposure or convective heat exposure.
- the inventive fabric structure achieves an LOT of greater than 25, in the combination with a microporous PTFE containing membrane the LOI can be increased far more than 27 (>>27), most likely greater than 30, depending on the weight of the PFTE component.
- At least one third fiber component or more additional fiber components can be used in the fiber blend in combination (e.g., antistatic fibers) in an amount of not more than 3% of the fiber blend weight.
- Additional fiber components may include carbon fiber, steel fiber, anti micro bacterial fibers (like silver fibers or metal ion containing fibers), PTFE fibers.
- the yarns of the fabric according to the invention do not include fibers or fiber blends comprising Aramides, PBI, or Modacryl, particularly do not include aramides, paraaramid, meta-aramid, PBI, Modacryl or blends thereof.
- the flame resistant (FR) viscose fibers are man-made cellulosic fibers comprising flame resistant additives which have been incorporated in the viscose matrix during fiber production.
- the fabric according to the invention has a weight in the range of 50 g/m 2 to 550 g/m 2 , preferably 90 g/m 2 -300 g/m 2 , more preferably 140 g/m 2 +/ ⁇ 10 g/m 2 .
- the fabric structure comprises at least one barrier layer adjacent to one side of the fabric.
- the barrier layer comprises a porous membrane layer made of expanded polytetrafluoroethylene (ePTFE).
- the first fiber component and the second fiber component are homogenously distributed in the yarns.
- At least one surface of the fabric is dyed such that it has a color fastness of greater than 4.
- at least one surface of the fabric is dyed with a carrier-free dye and such that it has a color fastness of greater than 4.
- the carrier-free dye is directly integrated into the fabric on at least one surface of the fabric having a color fastness of greater than 4.
- the fabric is printed with a dye having a color fastness of greater than 4, particularly for camouflage applications.
- FIG. 1 shows a schematic cross-sectional view of a yarn of a fabric structure according to an embodiment of the invention
- FIG. 2 shows a schematic top view of a part of a flame protective fabric structure according to an embodiment of the invention
- FIG. 3 shows a schematic cross-sectional view of a flame protective fabric structure which comprises a laminate of a flame protective fabric and a barrier layer according to an embodiment of the invention
- FIG. 4 shows an exemplary clothing article with comprises a flame protective fabric structure according to the invention
- FIG. 5 shows a schematic sectional view of a woven fabric structure for illustrating the fractional cover as used herein
- FIG. 6 shows a schematic view of a unit cell of plain fabric for illustrating the total fractional cover factor as used herein.
- FIG. 2 shows a schematic top view of a part of a woven flame protective fabric 10 in a flame protective fabric structure 1
- FIG. 1 shows a schematic cross-sectional view of a yarn 20 of the fabric 10 according to an embodiment of the invention.
- the fabric 10 is formed as a woven fabric with warp and weft yarns 20 each made of a fiber blend of at least a first fiber component and a second fiber component, as shown in FIG. 1 .
- the first fiber component comprises flame resistant viscose fibers 22 and the second fiber component comprises meltable fibers 24 .
- the flame resistant viscose fibers 22 are provided in an amount of at least 50% of the fiber blend weight and the meltable fibers 24 are provided in an amount of at least 10% of the fiber blend weight. Said ratio ensures the required flame protection due to a sufficient high amount of flame resistant fibers and the required stability due to a defined range of a minimum amount of meltable fibers.
- the fabric 10 is a woven textile construction, especially formed in a plain weave construction, as shown schematically in FIG. 2 .
- the fiber blend comprises the flame resistant viscose fibers 22 and the meltable fibers 24 in a weight ratio of 80:20.
- the meltable fibers 24 are made of polyamide (PA), preferably of polyamide 6.6.
- PA polyamide
- the second fiber component, i.e. the meltable fibers 24 are homogenously distributed in the yarns 20 .
- the fabric 10 is formed as a woven fabric or textile with a total fractional cover factor of greater than 60%.
- a dense and tight fabric structure is necessary for a flame resistant fabric in order to prevent the formation of holes in case of flame exposure.
- highly dense and tight fabric structures can be provided which stabilize each other within the fabric structure.
- the cover factor quantifies the grade of density and tightness of the woven fabric structure with regard to ratio, yarn fineness, woven fabric and density. In general the cover factor indicates the extent to which the area of a fabric is covered by one set of threads.
- FIG. 6 shows a principle aspect of the total cover factor, a top view of a woven fabric with the combination of fractional cover factor warp and weft.
- the inventive fabric structure provides, as a result of the particular combination of its constitutional and constructional features, a capability to withstand a horizontal flame exposure of 10 seconds without hole formation according to ISO 15025/14116_index III.
- the fabric 10 has a weight in the range of 50 g/m 2 to 550 g/m 2 , preferably 140 g/m 2 ⁇ 10%.
- the flame protective fabric structure 1 further comprises an additional barrier layer 30 adjacent to one side of the fabric 10 , for example, laminated to the fabric 10 by adhesive 40 discontinuously distributed over one surface of the fabric 10 so as to not compromise breathability of the fabric structure 1 .
- the barrier layer 30 is formed from a membrane layer and may be waterproof and/or windproof, and it may be breathable, i.e. permeable to water vapor.
- the harrier layer 30 is formed from a porous membrane made of expanded polytetrafluoroethylene (ePTFE).
- ePTFE expanded polytetrafluoroethylene
- Appropriate materials for a waterproof, water-vapor-permeable barrier layer are especially polyurethane, polypropylene, and polyester, including polyether ester and laminates thereof, as described in the documents U.S. Pat. No. 4,725,418 and U.S. Pat. No. 4,493,870.
- expanded microporous polytetrafluoroethylene (ePTFE) is particularly preferred, as described, for example, in documents U.S. Pat. No. 3,953,566, as well as U.S. Pat. No. 4,187,390, and expanded polytetrafluoroethylene provided with hydrophilic impregnation agents and/or hydrophilic layers; see, for example, document U.S. Pat. No. 4,194,041.
- Microporous functional layer or “microporous barrier layer” is understood to mean a functional layer whose average pore size is between about 0.2 ⁇ m and about 0.3 ⁇ m. The pore size can be measured with a Coulter PorometerTM, produced by Coulter Electronics, Inc., Hialeah, Fla., USA.
- a functional or barrier layer and the respective laminates are considered “waterproof” optionally including the seams provided on the barrier layer, if it guarantees a water-entry pressure of at least 1 ⁇ 10 4 Pa.
- the barrier layer material preferably guarantees a water-entry pressure of more than 1 ⁇ 10 5 Pa.
- the water-entry pressure is then measured according to a test method in which distilled water, at 20 ⁇ 2° C., is applied to a sample of 100 cm 2 of the barrier layer with increasing pressure. The pressure increase of the water is 60 ⁇ 3 cm H 2 O per minute. The water-entry pressure then corresponds to the pressure at which water first appears on the other side of the sample. Details of the procedure are stipulated in ISO standard 0811 from the year 1981.
- a functional or barrier layer is then considered “water-vapor-permeable” if it has a water-vapor transmission resistance Ret of less than 150 m 2 Pa/W.
- Water vapor permeability may be expressed by water vapor transmission resistance (RET)
- the water vapor transmission resistance (RET) is a specific material property of sheet-like structures or composites which determines the latent evaporation heat flux through a given area of the sheet-like structure or composite, under a constant partial pressure gradient.
- the RET is measured by the Hohenstein skin model, of the Be reliesphysio striges Institut (Apparel Physiology Institute] e.V. Hohenstein.
- the Hohenstein skin model is described in ISO 11092:1993.
- the barrier layer 30 is waterproof in that it bears a water pressure of at least 8 kPa (according to ISO 811-1981). It may have a water vapor transmission resistance Ret ⁇ 20 m 2 Pa/W (ISO 11092).
- the barrier layer may be air impermeable according to an air permeability of ⁇ 1 l/m 2 /s (ISO 9237-1995; 100 cm 2 , 2.5 kPa).
- the barrier layer may be windproof according to an air permeability of ⁇ 50 l/m 2 /s (ISO 9237-1995; 100 cm 2 , 2.5 kPa).
- the barrier layer has an air permeability of not more than 6 l/m 2 /s (according to ISO 9237).
- the fabric 10 is formed in a plain weave construction. It was found that, advantageously, a blend of 20% polyamide (PA) (particularly, PA 6.6 high tenacity) and 80% Lenzing FR fiber is a fiber blend with a good combination of advantageous properties as outlined herein, particularly for a plain weave fabric, such as having a weight of 140 g/m 2 . In other weight categories the ratio can be adjusted but should maintain a minimum percentage of 50% viscose FR fibers.
- PA polyamide
- Lenzing FR fiber is a fiber blend with a good combination of advantageous properties as outlined herein, particularly for a plain weave fabric, such as having a weight of 140 g/m 2 . In other weight categories the ratio can be adjusted but should maintain a minimum percentage of 50% viscose FR fibers.
- the woven fabric comprises a total fractional cover factor of greater than 66%. Particularly, it comprises a fractional cover factor weft of greater than 33%, and/or a fractional cover factor warp of greater than 50%, preferably adding up to a total fractional cover factor of greater than 66%.
- blended fiber components in small quantities e.g. for antistatic properties, can be added as long as they do not change the performance as considered in the concept.
- the blend of meltable, e.g. polyamide, and viscose FR fibers can be processed in conventional staple fiber spinning processes, e.g. ring spinning, open end, and/or compact spinning.
- staple fiber spinning processes e.g. ring spinning, open end, and/or compact spinning.
- the flame resistant viscose fibers and meltable fibers are made by staple fiber spinning and twisting.
- the coloring process may be very flexible for the fiber blend or the fabric structure, the choice of the fiber components allows the dying of the fiber blend or the fabric structure with reactive dye stuff. As well, high quality printing is possible delivering a clear, high-contrast print with high color fastness with reactive dye stuff, which may be required for multiple uniform applications.
- the inventive fabric structure itself shows a Limited Oxigen Index (LOI) of greater than 25, together with a microporous ePTFE containing membrane the level can be increased above 30.
- LOI Limited Oxigen Index
- the invention provides the advantage that all fibers in the blend may be chosen such that they are dyeable in high quality.
- the components of the blend are easy to process, therefore providing good repeatability. Thermosetting is possible, therefore providing a durable easycare performance, and all components together deliver high thermal stability and a very high LOI.
- flame resistant viscose fibers can be used.
- examples of various embodiments of appropriate flame resistant viscose fibers are described:
- the FR Viscose fiber is a man-made cellulosic fiber which is flame retardant by incorporating “phosphorous” in the viscose matrix.
- the phosphorous flame retardant (or any other appropriate flame retardant) is incorporated at the fiber spinning stage.
- FR Viscose has been extensively used in fabric blends where it provides increased moisture absorption and comfort without compromising protection.
- the dyeability of the FR Viscose fiber is possible in a wide range of colors; however, color fastness to laundering is variable and similar to normal viscose fiber.
- FR Viscose is stable when exposed to a wide variety of acids and alkalis.
- FR Viscose is stable when exposed to a wide variety of bleaching agents and organic solvents. It has typically a LOI of 29.
- flame resistant viscose fibers as may be used herein are cellulosic man-made fibers containing viscose.
- An overview of methods used to render cellulosic textiles flame-retardant (or flame-resistant) and the mechanisms used for this is supplied by the publication: Horrocks, A. R.; Kandola, B. K. “Flame Retardant Cellulosic Textiles” Spec. Publ.-Royal Society of Chemistry, volume 224, year 1998, pages 343-362.
- the methods described differ in the element responsible for the flame-retardation (mainly phosphorus, however, nitrogen, boron and sulphur as well), the place of the application (surface treatment mainly with cotton, additive in fiber production with man-made fibers) and the permanency (degree of resistance of flame-retardant properties after laundering treatments).
- Tris(2,3-bromopropyl)phosphate is suggested as the flame-retardant agent.
- a fiber of this kind was produced for some time on an industrial scale.
- a class of substances used as a flame-retardant agent is that of substituted phosphazenes, A flame-retardant viscose fiber was produced at industrial level on the basis of these substances (U.S. Pat. No. 3,455,713).
- the flame-retardant agent is however in liquid form and can only be spun into viscose fibers with a lower yield (approx. 75 weight percent) and it tends to migrate out of the fiber thus giving the fiber an undesirable stickiness.
- Tris(2,3-bromopropyl)phosphate Apart from the above named Tris(2,3-bromopropyl)phosphate, a series of other organo-phosphates respectively phosphonic acid amides and esters were described as flame-retardant agents for viscose fibers (DE 2,451,802; DE 2,622,569; U.S. Pat. No. 4,193,805; U.S. Pat. No. 4,242,138; JP 51-136914; DE 4,128,638).
- Lenzing FR Viskose fibers may be used.
- Possible meltable fibers are PA (polyamide), PP (polypropylen), and/or PE (polyethylen), which may be used herein.
- Polyamide Fiber Particularly Polyamide Staple Fiber:
- PA polyamide
- PA Fiber up to now is typically not used in FR applications as the LOI is with 22 too low for FR performance on its own and the fibers show melting and hole formation in flame tests. In blends it has been used only with cotton with additional FR post treatment (probanisation).
- Possible polyamide fibers are made of polyamide (PA), such as PA 6, PA 6.4, PA 6.12, and/or PA 6.6.
- PA polyamide
- Dying as used herein shall be understood as relating to a process of adding color to the textile component.
- it may comprise processes like color printing, transfer film printing and all known dye bath processes.
- a fabric structure according to the invention comprises in a homogeneous distribution of fibers a fiber blend of 20% Cordura® (PA 6.6) commercially available by the company Invista and 80% Lenzing FR® viscose fibers, commercially available by the company Lenzing made by ring spinning and twisting, the fabric formed as a woven fabric (plain weave) with a total cover factor of 66.6% and a weight of 140 g/m 2 ⁇ 10%, which passes the horizontal flame test.
- the fabric can be provided with a flour carbon finish.
- FIG. 4 shows an example of a clothing article 70 in the form of an outer covering, for example, a firefighting protective jacket, constructed with a fabric structure 1 according to the invention, as explained above.
- the fabric 10 is arranged to form an outer material 71 of the clothing article 70 and the barrier layer 30 may be part of a two or three layer laminate attached to the inner side of the fabric 10 , as shown in FIG. 3 , the laminate forming an inner material 72 of the clothing 70 .
- a very high LOI>27 can be obtained.
- the inventive fabric structure shows a lower textile weight than a fabric structure made with, e.g. Modacryl/Cotton blends or Viscose Modacryl blends.
- a sample of a fabric structure according to the invention having a weight of 140 g/m 2 can pass the ISO 15025 requirement as set out above.
- a Modacryl/Cotton blend requires a minimum fabric weight of 230 g/m 2 to pass said ISO 15025 test.
- Plain colors can be obtained with high color fastness as compared to Aramide fiber blends (achievable color fastness>4 for ISO105-B02, -X12).
- flame retardant or “flame resistant”, in the context of this invention, means that the fabric structure has limited flame propagation and works as flame barrier against break open under flame exposure.
- European standard EN 533 (1997) establishes performance requirements for limited flame propagation of materials, based on the results of tests according to EN 532 (corresponds to EN ISO 15025 (2003)/14116).
- the test was used to determine the thermal stability of textile materials. This test is based on thermal stability test as described in section 8.3 of NFPA 1975, 2004 Edition.
- the test oven was a hot air circulating oven as specified in ISO 17493.
- the test was conducted according to ASTM D 751 , Standard Test Methods for Coated Fabrics , using the Procedures for Blocking Resistance at Elevated Temperatures (Sections 89 to 93), with the following modifications:
- the specimens were allowed to cool a minimum of 1 hour after removal of the glass plates from the oven.
- meltable Any sample side sticking to glass plate, sticking to itself when unfolded, or showing evidence of melting or dripping was considered as meltable. Any sample side lacking evidence of meltable side was considered as thermally stable.
- a textile made of meltable fibers according to an embodiment of the invention has been manufactured and tested based on the test description above.
- Measurement of flame retardant was carried out in accordance with International Standard ISO 15025 (2003) for 10 sec flame to surface. Outer textile face of the sample was exposed to the flame for 10 sec. After flame time was recorded. Samples with an after flame time of greater than 10 sec were considered as flammable. Samples with an after flame of 2 sec or less were considered as non-flammable. Preferred samples have an after glow of 2 sec or less. Most preferred samples have no after flame, no after glow and no hole formation.
- the performance is expressed by an index of limited flame propagation defined in ISO 14116, Three performance stages are established:
- Clothing with Index III fulfills the requirements of protective clothing for fire fighters and other Heat &Flame protective clothing.
- the cover factor indicates the extent to which the area of a fabric is covered by one set of threads.
- the cloth cover factor is obtained by adding the weft cover factor to the warp cover.
- tex is a standard unit of measure for the linear mass density of fibers and is defined as the mass in grams per 1000 meters.
- cover In fabrics constructed from yarns, cover may be considered as the fraction of the total fabric area that is “covered” by the component yarns.
- An over-simplification of the idea for woven fabric is shown in FIG. 5 .
- the yarn has a circular cross-section of diameter, d, and adjacent yarns are displaced by a distance s.
- the fractional cover is then d/s.
- s will be equal to 1/n, where n is the number of threads per unit length.
- the fractional cover could be expressed in terms of d and n.
- the total area covered by the fabric is ABCD.
- the shaded area in FIG. 6 is the part of the total area covered by both yarns, and, because of this, it would not be strictly accurate merely to add the warp and weft cover values together and quote them as the total cover factor.
- the fabric according to example 1 shows the following total fractional cover factor:
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EP13155646.6A EP2767180B1 (de) | 2013-02-18 | 2013-02-18 | Flammschützende Gewebestruktur |
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EP (1) | EP2767180B1 (de) |
JP (1) | JP5837633B2 (de) |
KR (1) | KR101569272B1 (de) |
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US20130174334A1 (en) * | 2010-10-20 | 2013-07-11 | Teijin Limited | Layered heat-proof protective clothing |
RU2638335C1 (ru) * | 2017-03-23 | 2017-12-13 | Акционерное общество "ФПГ ЭНЕРГОКОНТРАКТ" | Термостойкий огнестойкий материал |
US20170362758A1 (en) * | 2016-06-20 | 2017-12-21 | Dong-A Tol Co., Ltd. | Camouflage clothing woven using dyed threads and jacquard weaving machine and method of weaving the same |
WO2024038467A1 (en) * | 2022-08-18 | 2024-02-22 | Tarasafe International Pvt. Ltd. | Light weight flame resistant fabric |
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US9988758B2 (en) * | 2015-06-15 | 2018-06-05 | W. L. Gore & Associates, Inc. | Fabrics containing expanded polytetrafluoroethylene fibers |
KR20170032727A (ko) | 2015-09-15 | 2017-03-23 | 한국건설기술연구원 | 고온 파형단면 형상유지 구조를 이용한 화재보강구조 |
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US20130174334A1 (en) * | 2010-10-20 | 2013-07-11 | Teijin Limited | Layered heat-proof protective clothing |
US9415246B2 (en) * | 2010-10-20 | 2016-08-16 | Teijin Limited | Layered heat-proof protective clothing |
US20170362758A1 (en) * | 2016-06-20 | 2017-12-21 | Dong-A Tol Co., Ltd. | Camouflage clothing woven using dyed threads and jacquard weaving machine and method of weaving the same |
US9920464B2 (en) * | 2016-06-20 | 2018-03-20 | Dong-A Tol Co., Ltd. | Camouflage clothing woven using dyed threads and jacquard weaving machine and method of weaving the same |
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Also Published As
Publication number | Publication date |
---|---|
JP5837633B2 (ja) | 2015-12-24 |
KR101569272B1 (ko) | 2015-11-13 |
EP2767180B1 (de) | 2017-01-04 |
RU2570781C2 (ru) | 2015-12-10 |
CN103989275A (zh) | 2014-08-20 |
RU2014105779A (ru) | 2015-08-27 |
JP2014159666A (ja) | 2014-09-04 |
KR20140103868A (ko) | 2014-08-27 |
EP2767180A1 (de) | 2014-08-20 |
CA2841693C (en) | 2017-06-13 |
CA2841693A1 (en) | 2014-08-18 |
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