WO2020254931A1 - Fibres ultra courtes bouclées pour tissu non tissé et leur procédé de préparation - Google Patents

Fibres ultra courtes bouclées pour tissu non tissé et leur procédé de préparation Download PDF

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Publication number
WO2020254931A1
WO2020254931A1 PCT/IB2020/055554 IB2020055554W WO2020254931A1 WO 2020254931 A1 WO2020254931 A1 WO 2020254931A1 IB 2020055554 W IB2020055554 W IB 2020055554W WO 2020254931 A1 WO2020254931 A1 WO 2020254931A1
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Prior art keywords
fibres
shortcut
curled
range
length
Prior art date
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Ceased
Application number
PCT/IB2020/055554
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English (en)
Inventor
Saurabh Singh
Dhrubajyoti KALITA
Vinaya Bhagwat Ghodake
Manish Bhupatray JOSHI
Ravi PATIDAR
Akhila SHETTIGAR
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Grasim Industries Ltd
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Grasim Industries Ltd
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Publication of WO2020254931A1 publication Critical patent/WO2020254931A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/26—Formation of staple fibres
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4391—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece characterised by the shape of the fibres
    • D04H1/43918—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece characterised by the shape of the fibres nonlinear fibres, e.g. crimped or coiled fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/013—Regenerated cellulose series

Definitions

  • Hydro-entanglement is sometimes known as spun lacing, as the arrangement of jets gives a wide variety of aesthetically pleasing effects.
  • the uniform distribution of fibres has a direct bearing on the strength of the web or non-woven fabric.
  • Flushability refers to the ability of a material to disintegrate in water under gentle agitation in a relatively short period of time to avoid choking in the sewer systems.
  • Filament refers to a fibre of continuous length. All fibres that have a practically unlimited length are considered as filaments.
  • Curled shortcut fibres refer to shortcut cellulosic fibres having curled shape i.e., the shortest distance between the two ends of at least 50% of the curled shortcut fibres is less than 90% of the total length of the curled shortcut fibres.
  • Non-woven fabrics are materials that are manufactured by a non-woven process by using either staple fibres or long fibres.
  • the material used for producing non-woven fabrics such as wet wipes, needs to be biodegradable in nature as the used wipes usually end up in drains and water bodies.
  • One of the limitations of such products is their relatively inferior flushability, which leads to inefficient disintegration in the sewer systems.
  • the commonly used material for wet wipes includes cellulosic pulp or materials derived therefrom.
  • Cellulosic pulp is 100% biodegradable cellulose, which has relatively short stiff fibres with length of 2 to 3 mm, which do not easily entangle.
  • the bond type between the fibres is hydrogen bonding which is reversible in nature. Further, the structure is relatively planar, with little or no fibre entanglement. In the absence of hydrogen bonds, a slurry of short, un-entangled biodegradable cellulose fibres exists.
  • the fibres made from dispersible material such as viscose, lyocell, cotton, polyester, polypropylene (PP), polyethylene (PE), polylactic acid (PL A) and the like, are further added for improving the fabric wet strength and dry strength.
  • the addition of these fibres can also reduce flushability.
  • the conventional shortcut fibres are obtained from well aligned tows which lead to parallel aligned shortcut fibres. In order to impart good wet tensile strength, high amounts of shortcut fibres need to be added. However, this not only adds to the cost of the fabric, but also leads to difficulty in processing during the manufacture of the non-woven fabric.
  • Yet another object of the present disclosure is to provide a process for making curled shortcut fibres from wet filament tow obtained during the process of viscose, modal or lyocell.
  • Yet another object of the present disclosure is to provide a non- woven fabric that has comparatively better wet strength, higher wet strength to dry strength ratio and comparatively better flushability.
  • the present disclosure envisages curled shortcut fibres for non-wovens.
  • Each curled shortcut fibre has length in the range of 3 mm to 25 mm and denier in the range of 1.0 to 3.0.
  • the curled shortcut fibres are made from the wet filament tow obtained during the process of manufacturing viscose, modal or lyocell.
  • the shortest distance between the two ends of at least 50% of the curled shortcut fibres is in the range of 70% to 90% of the total length of the curled shortcut fibres.
  • the curled shortcut fibres have a fibre-to-fibre friction in the range of 100 Nm/s to 500 Nm/s before washing and in the range of 200 Nm/s to 400 Nm/s after washing.
  • each curled shortcut fibre has length in the range of 3 mm to 25 mm.
  • the non-woven fabric comprises a blend of cellulosic pulp fibres and curled shortcut fibres wherein,
  • the cellulosic pulp fibres are in the range of 60 wt.% to 99 wt.% of the total blend of the fabric; and ⁇ the curled shortcut fibres are in the range of 1 wt.% to 40 wt.% of the total blend of the fabric.
  • a process for preparing the curled shortcut fibres for non-woven fabric comprising the following steps: i) obtaining a wet filament tow comprising filaments having denier in the range of 1.0 to 3.0;
  • a personal care product selected from the group consisting of wipes, diapers, training pants, baby wipes, feminine care products, adult incontinence products, wound dressings, surgical caps and drapes which comprise the curled shortcut fibres described above.
  • a desulphurization agent can be avoided in case the filament tow is obtained during the process of making lyocell as it is a solvent spinning process.
  • Figure 1(A) illustrates the photographic image of conventional parallel aligned shortcut fibres
  • Figure 1(B) illustrates the photographic image of curled shortcut fibres (Sample 1), in accordance with the present disclosure.
  • Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
  • Products such as wet wipes are required to be biodegradable as they usually end up in drains and water bodies. They are prepared from cellulosic pulp or materials derived therefrom such as viscose, lyocell, cotton and the like. However, the conventionally manufactured wet wipes may have relatively inferior flushability, leading to inefficient disintegration in the sewer systems. Shortcut fibres made from bio-degradable material such as viscose, modal, lyocell or cotton, are added to the cellulosic pulp material for obtaining fabric having improved strength. Further, the conventional viscose shortcut fibres are obtained from well-aligned tows which lead to obtaining straight viscose shortcut fibres.
  • the present disclosure envisages curled shortcut fibres for non-woven fabric and a process for preparation thereof.
  • a non-woven fabric made using the curled shortcut fibres of the present disclosure, produced by staple fibre process, has comparatively better fabric strength, better softness, uniform distribution of fibres, lower level of defects and comparatively improved flushability, than conventional fabric prepared using parallel aligned fibres.
  • the present disclosure envisages curled shortcut fibres, wherein each fibre has length in the range of 3 mm to 25 mm and denier in the range of 1.0 to 3.0.
  • the curled shortcut fibres can be made from, but are not limited to, viscose.
  • the curled shortcut fibres can also be made from the wet filament tow obtained from the process of manufacturing modal or lyocell.
  • the curled shortcut fibres have a curled shape, wherein the shortest distance between two ends of at least 50% of the curled shortcut fibres is in the range of 70% to 90% of the total length of the curled shortcut fibres.
  • the curled shortcut fibres have a fibre-to-fibre friction in the range of 100 Nm/s to 500 Nm/s. In an embodiment, the curled shortcut fibres have a fibre-to-fibre friction in the range of 200 Nm/s to 400 Nm/s. After washing, the curled shortcut fibres have fibre-to- fibre friction in the range of 100 to 500 Nm/s. In an embodiment, after washing, the fibre-to-fibre friction is in the range of 200 - 400 Nm/s.
  • the friction behaviour can be tuned for better dispersibility in water with choice of specific fibre soft finish and its amount.
  • the material of the curled shortcut fibres can be, but is not limited to, viscose, modal and lyocell.
  • the curled shortcut fibres have a length in the range of 3 mm to 25 mm and denier in the range of 1.0 to 3.0.
  • the material of the curled shortcut fibres can be, but is not limited to, viscose, modal or lyocell.
  • curled nature of the curled shortcut fibres leads to improved properties of the non-woven fabric, such as comparatively better fabric strength, better softness, uniform distribution of fibres, lower level of defects and improved flushability, than the fabric prepared by using conventional parallel aligned shortcut fibres.
  • the curled cellulosic fibres of the present disclosure can be suitably used for making products requiring cellulose fibres that are substantially wet stable, such as disposable absorbent products including, but not limited to, personal care products, such as diapers, training pants, baby wipes, feminine care products, adult incontinence products, and medical products such as wound dressings, surgical caps or drapes. They can also be used for semi-disposable items.
  • the present disclosure also provides a process for preparing curled shortcut fibres.
  • the process comprises the following steps:
  • the step of obtaining the viscose filament tow is done by extrusion of the viscose dope through spinnerets into a spinning bath comprising 70 g/litres to 140 g/litres of sulfuric acid, 8 g/litres to 50 g/litres of zinc sulphate and 100 g/litres to 360 g/litres sodium sulphate.
  • the filaments so obtained are withdrawn from the bath, passed over stretch bath and stretch rollers to achieve a stretch of 35% to 100%, to obtain obtain the viscose filament tow.
  • the spinning speed is maintained at 30 m/min to 75 m/min.
  • the step of cutting the filaments of the wet filament tow can be done by any one equipment including, but not limited to, rotary venturi cutter and reel cutter.
  • the step of cutting the tow is done by using a rotary venturi cutter.
  • the cutter is made of a rotor having arms mounted with blades, wherein the rotating action of the cutter blades cuts the tow.
  • the tow is fed into the cutter using a venturi funnel operated with soft water, wherein the venturi helps to keep the tow straightened for achieving accurate cutting, to obtain the straight shortcut fibres.
  • the step of cutting is done by using a reel cutter, which uses a reel made of two discs mounted together and separated apart by tie pins.
  • the peripheries of the discs are mounted with blades parallel to each other with the sharp edge facing outward.
  • a pressure roller wheel is fixed in position close to the blade tips such that the wheel forces the fibre against the blade tips thus cutting the fibre to obtain the straight shortcut fibres.
  • the cut fibre passes through the opening between the blades and falls from the centre.
  • the tow is washed during the stage of stretching with hot water, using the cutter and then optionally squeezed to help washing of the acid being carried with the tow.
  • the washed tow is squeezed for reducing the acid content of the tow to less than 5 %. It is to be noted that, wet viscose fibres (tow) tend to form hard deposits which can adversely impact performance of the cutter. It is obvious for a person skilled in the art to perform various modifications in the design of the cutter to improve the performance and reliability of the cutter.
  • the predetermined temperature is at least 90 °C. In an embodiment, the predetermined temperature is 90 °C to 100 °C. In an exemplary embodiment, the predetermined temperature is 92 °C.
  • the curled fibres obtained from the high turbulent zone are received in the form of slurry.
  • the slurry is squeezed to remove some of the water and to obtain a mat.
  • the mat is washed with hot water repeatedly to remove impurities from the mat, while maintaining the temperature of the water between 85°C and 95°C.
  • the mat of the curled shortcut fibres obtained from the turbulent zone can be subjected to the step of bleaching the fibres by using a bleaching agent, followed by application of a surface modifier, prior to drying.
  • the surface modifiers are added to the fibres in the mat to give a soft finish to the fibres and prevent entanglement or static during carding or other downstream processes.
  • the surface modifier is used in an amount in the range of 0.01 wt.% to 1 wt.% of the fibres in the mat. In an embodiment, the amount of the surface modifier added is less than 0.5 wt.% of the fibres in the mat.
  • the desulphurization agent can be at least one selected from the group consisting of, but not limited to, sodium hydroxide, sodium sulphide, hot water, an organic reagent, an ion exchange resin, a coagulant, a dispersant.
  • the mat is not to be treated with a desulphurization agent, as it is a solvent spinning process and does not involve any chemical modification with carbon disulphide.
  • the step of desulphurization can be avoided.
  • the wet filament tow is subjected to multiple washings in water baths to reduce N-methylmorpholine N-oxide (NMMO) content prior to cutting of the tow.
  • NMMO N-methylmorpholine N-oxide
  • the straight cut fibres are prepared by cutting viscose filament tow in fibre lengths ranging from 3 mm to 25 mm and then subjecting the cut fibres to high turbulence zone made up of a mixture of steam, hot air or hot inert gases and water to allow curling of the shortcut fibres, washing and carbon disulphide removal, to obtain moist curled shortcut fibres. This is followed by multiple steps of washing for impurity removal, followed by bleaching and application of surface modifier in wet state and then drying to desired moisture level to obtain curled shortcut fibres having length in the range of 3 mm to 25 mm and fibre denier in the range of 1.0 to 3.0.
  • the curled shortcut fibres are used for preparing a non-woven fabric for a variety of end use applications.
  • the non-woven fabric is a wet wipe or flushable wipe.
  • the non-woven fabric prepared by using the curled shortcut fibres of the present disclosure, has the following characteristics as illustrated in Table 1 below, which is provided in comparison to a non-woven fabric made from conventionally used parallel aligned fibres.
  • curled shortcut fibres of the present disclosure exhibit improved characteristics as compared to the conventionally used parallel aligned fibres. Further, the flushability of the non-woven fabric made by using curled shortcut fibres of the present disclosure is comparatively better than the non-woven fabric made by conventionally used parallel aligned fibres, as given in Table 2 below:
  • the present disclosure provides curled shortcut fibres and a non-woven fabric prepared therefrom, which has comparatively better fabric strength, better softness, uniform distribution of fibres, lower level of defects and comparatively improved flushability, in comparison to a fabric prepared from conventionally used parallel aligned fibres.
  • Viscose was spun to form filament tow by extrusion of viscose dope through spinnerets into a spinning bath comprising HOg/litres of sulfuric acid, lOg/litres of zinc sulphate and 340g/litres sodium sulphate.
  • the filaments were withdrawn from the bath, passed over stretch bath and stretch rollers to achieve a stretch of 40%, wherein the spinning speed was maintained at 49m/min, to obtain a wet viscose filament tow with 1.2dpf.
  • the filaments in the wet viscose filament tow were cut to obtain straight shortcut fibres, using reel cutter method.
  • the straight shortcut fibres were subjected to processing by treating with hot water in a high turbulence zone comprising a mixture of steam, hot air or hot inert gases and water, at 92°C for around 10 minutes, wherein the removal of carbon disulphide takes place.
  • the moist curled shortcut fibres were squeezed to remove some amount of moisture and obtain a mat of moist of curled shortcut fibres. This was followed by hot water washing while maintaining the temperature of the water between 85°C and 95 °C, and washing in the desulphurization bath, a bleach bath and an acetic acid bath for neutralization of the alkalis used in the earlier bath.
  • the fibre mat was then treated in a soft finish zone by a lubricating agent to obtain treated moist curled shortcut fibres.
  • the treated moist curled shortcut fibres were dried at 110 °C for 20 minutes, to obtain curled shortcut fibres having moisture of around 10%.
  • Cellulose dope comprising N-methylmorpholine N-oxide (NMMO) was spun to form filament tow by extrusion of viscous dope solution through spinnerets at a range of temperatures around 100°C depending on the viscosity of the solution.
  • the cellulose is regenerated after passing through an air gap into the spinning bath comprising NMMO and water mixture, which lie outside the solubility range.
  • the filaments were withdrawn from the bath, passed over stretch bath and stretch rollers to obtain a wet lyocell filament tow with 1.2dpf.
  • the filaments in the wet Lyocell filament tow were cut to obtain straight shortcut fibres, using reel cutter method.
  • the straight shortcut fibres were subjected to processing by treating with hot water in a high turbulence zone comprising a mixture of air and water, at 92 °C for around 10 minutes, wherein the removal of residual solvent (NMMO) takes place.
  • the moist curled shortcut fibres were squeezed to remove some amount of moisture and obtain a mat of moist of curled shortcut fibres. This was followed by hot water washing, followed by a bleach bath.
  • the fibre mat obtained was then treated in a soft finish zone with a surface modifier to obtain treated moist curled shortcut fibres.
  • the treated moist curled shortcut fibres were dried at 110 °C for 20 minutes, to obtain curled shortcut fibres having moisture of around 10%.
  • the curled shortcut fibres of length of 8 mm (Sample 1) and of length of 10 mm (Sample 2) from viscose filament tow and of length of 10 mm (Sample 3) from lyocell filament tow were obtained.
  • the curled shortcut fibres (Sample 1 and Sample 2) were used for manufacturing non-woven fabric at bench scale, using wet laid technique, which had fibre characteristics as shown in Table 3.
  • a reference fabric sample was also prepared by using conventional parallel aligned fibres.
  • the fabric obtained by the bench scale method by using curled shortcut fibres of the present disclosure have improved strength in wet state and higher wet/dry strength ratio, than conventional fabric made from parallel aligned fibres.
  • the fabric obtained by commercial scale method was subjected to testing of fibre characteristics as given in Table 4.
  • the fabric obtained by the commercial scale method by using curled shortcut fibres of the present disclosure had improved strength, in dry and wet state, as compared to the conventional fabric made from parallel aligned fibres.
  • the fibre-to-fibre friction was measured using sledge method for friction measurement. Fibre samples were conditioned at 25 °C and 50% relative humidity before friction measurement. Carded fibre lap was then horizontally placed on a metal plate. The sledge was placed on the far end of the plate above the lap. This sledge was then pulled with 2kg weight placed on it by means of a wire which was hooked with a load cell. When the sledge moved, the fibres slide against each other and against the metal surface, hence a frictional force was developed which was measured on the load cell.
  • the sliver width of the fibres was measured using the Roto ring test. Fibre sliver was formed which was used for measuring the cohesion width. It was observed that with increase in the value of sliver width the cohesion decreases and vice versa.
  • the fabric obtained by commercial scale method by using curled shortcut fibres of the present disclosure had improved flushability as compared to the conventional fabric made from parallel aligned fibres, especially due to the curled nature of the shortcut fibres used.
  • the present disclosure provides curled shortcut fibres and a non-woven fabric prepared therefrom, which has comparatively better fabric strength, better ratio of wet/dry strength, lower level of defects on the fabric and comparatively improved flushability, in comparison to a fabric prepared from conventionally used parallel aligned fibres.
  • TECHNICAL ADVANCEMENTS AND ECONOMICAL SIGNIFICANCE described herein above has several technical advantages including, but not limited to, the realization of curled shortcut fibres for non-woven fabric, wherein the fabric has: - comparatively better fabric strength characteristics; better softness; lower level of defects on the fabric; uniform distribution of fibres in the fabric; comparatively improved flushability; - ease of scalability and operations; and lower process costs.
  • the invention disclosed herein will contribute to the country’s economy growth by way of involvement of a new efficient and quality method of manufacturing a product.
  • the flush-ability of the final product will ensure that sewers and drains are not clogged.
  • the product in accordance with present invention will be in great demand in country and worldwide due to the novel technical features of the present invention.
  • This invention is a technical advancement in the fibres for non-woven fabric.
  • the technology in accordance with present disclosure will provide a cheaper product, saving in time of the total process of manufacture. The saving in production time will improve the productivity, and cost cutting of the product, which will directly contribute to economy of the country.
  • the product will contribute a new concept in the fibres for non-woven fabric and a process for their preparation.
  • the present disclosure will replace the whole concept of non-woven fabric being used in multitude of product types such as personal care products, incontinence products, medical products since decades.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)

Abstract

La présente invention concerne le domaine des fibres pour tissu non tissé, en particulier des fibres ultra courtes bouclées pour tissu non tissé, et leur procédé de préparation. Les fibres ultra courtes bouclées de la présente invention ont une longueur dans la plage de 3 mm à 25 mm et un denier dans la plage de 1,0 à 3,0. Les fibres ultra courtes bouclées ont une forme bouclée, la distance la plus courte entre les deux extrémités d'au moins 50 % des fibres ultra courtes bouclées étant dans la plage de 70 % à 90 % de la longueur totale des fibres ultra courtes bouclées. Les fibres ultra courtes bouclées ont un frottement fibre à fibre dans la plage de 100 Nm/s à 500 Nm/s. L'invention concerne également un tissu non tissé comprenant des fibres ultra courtes bouclées de la présente invention. Le tissu non tissé comprenant des fibres ultra courtes bouclées présente une résistance à l'état humide comparativement meilleure et une meilleure aptitude au rinçage.
PCT/IB2020/055554 2019-06-18 2020-06-13 Fibres ultra courtes bouclées pour tissu non tissé et leur procédé de préparation Ceased WO2020254931A1 (fr)

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IN201921024056 2019-06-18
IN201921024056 2019-06-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022126515A (ja) * 2021-02-18 2022-08-30 ニッポン高度紙工業株式会社 不織布及び非水系二次電池
EP4299809A1 (fr) * 2022-10-31 2024-01-03 Lenzing Aktiengesellschaft Substrat non tissé comprenant au moins une couche fibreuse

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EP0049710B1 (fr) * 1980-10-13 1985-08-21 Avtex Fibers Inc. Fibres de cellulose régénérée frisées, procédé pour leur fabrication, et tissus en contenant
EP0703997A1 (fr) * 1993-05-24 1996-04-03 Courtaulds Fibres (Holdings) Limited Fabrication de fibres de cellulose frisees, filees avec un solvant
WO2018160587A1 (fr) * 2017-02-28 2018-09-07 Eastman Chemical Company Fibres d'acétate de cellulose dans des tissus non-tissés

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US3720743A (en) * 1970-10-20 1973-03-13 Itt Process for producing high performance crimped rayon staple fiber
EP0049710B1 (fr) * 1980-10-13 1985-08-21 Avtex Fibers Inc. Fibres de cellulose régénérée frisées, procédé pour leur fabrication, et tissus en contenant
EP0703997A1 (fr) * 1993-05-24 1996-04-03 Courtaulds Fibres (Holdings) Limited Fabrication de fibres de cellulose frisees, filees avec un solvant
WO2018160587A1 (fr) * 2017-02-28 2018-09-07 Eastman Chemical Company Fibres d'acétate de cellulose dans des tissus non-tissés

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Publication number Priority date Publication date Assignee Title
JP2022126515A (ja) * 2021-02-18 2022-08-30 ニッポン高度紙工業株式会社 不織布及び非水系二次電池
JP7666946B2 (ja) 2021-02-18 2025-04-22 ニッポン高度紙工業株式会社 不織布及び非水系二次電池
EP4299809A1 (fr) * 2022-10-31 2024-01-03 Lenzing Aktiengesellschaft Substrat non tissé comprenant au moins une couche fibreuse

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