US20220120032A1 - Denim fabric and its use - Google Patents
Denim fabric and its use Download PDFInfo
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- US20220120032A1 US20220120032A1 US17/428,182 US202017428182A US2022120032A1 US 20220120032 A1 US20220120032 A1 US 20220120032A1 US 202017428182 A US202017428182 A US 202017428182A US 2022120032 A1 US2022120032 A1 US 2022120032A1
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- fabric
- yarn
- denim
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- 239000004744 fabric Substances 0.000 title claims abstract description 84
- 125000002091 cationic group Chemical group 0.000 claims abstract description 21
- 239000003607 modifier Substances 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 18
- 238000004043 dyeing Methods 0.000 claims description 17
- 229920000433 Lyocell Polymers 0.000 claims description 14
- 239000000975 dye Substances 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 229920002334 Spandex Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002759 woven fabric Substances 0.000 claims description 4
- 206010003402 Arthropod sting Diseases 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 15
- 229940097275 indigo Drugs 0.000 description 15
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 15
- 238000009940 knitting Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 229920000742 Cotton Polymers 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 238000009970 yarn dyeing Methods 0.000 description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 102000004190 Enzymes Human genes 0.000 description 3
- 108090000790 Enzymes Proteins 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- QTWZICCBKBYHDM-UHFFFAOYSA-N leucomethylene blue Chemical compound C1=C(N(C)C)C=C2SC3=CC(N(C)C)=CC=C3NC2=C1 QTWZICCBKBYHDM-UHFFFAOYSA-N 0.000 description 2
- 238000009974 package dyeing Methods 0.000 description 2
- 238000009971 piece dyeing Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- -1 cationic triazin compounds Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000009972 garment dyeing Methods 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000985 reactive dye Substances 0.000 description 1
- 238000004045 reactive dyeing Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000004759 spandex Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical class CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 1
- 239000000984 vat dye Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
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- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/52—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment combined with mechanical treatment
- D06M13/53—Cooling; Steaming or heating, e.g. in fluidised beds; with molten metals
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- 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
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- D03D15/217—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 natural from plants, e.g. cotton
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- 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
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- D03D15/54—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 coloured
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- D03D15/56—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 elastic
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- D04B1/24—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel
- D04B1/243—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel upper parts of panties; pants
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- D04B1/24—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel
- D04B1/246—Upper torso garments, e.g. sweaters, shirts, leotards
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- D06M16/00—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
- D06M16/003—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic with enzymes or microorganisms
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
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- D06P3/66—Natural or regenerated cellulose using reactive dyes
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- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
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- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
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- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
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- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
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- D06P5/137—Fugitive dyeing or stripping dyes with other compounds
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- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
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- D06P5/2072—Thermic treatments of textile materials before dyeing
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- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
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- D06P5/225—Aminalization of cellulose; introducing aminogroups into cellulose
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- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
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- D06M2101/06—Vegetal fibres cellulosic
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- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
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Definitions
- This invention relates to a fabric consisting of at least a first yarn containing cellulosic fibers modified by a cationic modifier and a second yarn containing cellulosic fibers not modified by a cationic modifier, and to the use of this fabric in order to obtain a denim appearance.
- Denim is a kind of comfortable, fashionable, durable, casual textile fabric and popular in all age groups and all countries. Due to its typical, unique appearance—in particular the wash-out effect and its reputation as a durable fabric—garments made of denim have a cult item status.
- the traditional denim is woven-made by interlacings of warp and weft yarns feature to create fabric construction with color fading feature and it is normally a stiff, heavy weight and high-density fabric.
- the fabric construction usually is 3/1 or 2/1 twill and 1/1 chambray construction.
- FIG. 1 shows a typical fabric construction.
- a coloured yarn and a white yarn have to be used for the weaving.
- the coloured yarn is used as the warp yarn while the white yarn is used as the weft yarn.
- the weaver has to keep at least two kinds of yarn in stock. If various coloured fabrics are needed, further yarns already dyed to the target fabric colour have to be kept in stock. Yarn dyeing generally is performed in specific dyeing equipment and therefore more costly than e.g. fabric dyeing or piece dyeing. Furthermore, only a very limited number of colours suitable for denim-look dyeing is available.
- indigo dyestuff is commonly used for denim dyeing.
- the indigo pigment is a kind of water-insoluble vat dye. It has no affinity for the cellulosic fiber.
- a lot of chemicals like sodium hydroxide and sodium hydrosulfite are required to convert the indigo into a water-soluble form which is a kind of fiber-affinitive leuco form.
- the work-flow of the typical indigo yarn dyeing process is as follows: Prewetting—rinsing—scouring—rinsing—yarn indigo dyeing (rope dyeing)—rinsing/softening—rebeaming.
- Indigo dyeing even nowadays is done in dye houses with waste water treatment plant and causes high cost for water treatment. Furthermore, the fabrics show low wet rubbing fastness.
- a typical indigo yarn dyeing factory where 10 tons indigo yarn per day are dyed with a recipe as follows: Indigo pigment: 4 g/l; Sodium hydrosulfite 3.2 g/l; sodium hydroxide 2.68 g/l; pick-up 70%, 10 dips, the consumption is 280 kg indigo, 224 kg sodium hydrosulfite and 188 kg sodium hydroxide per day, most of it need to treat before going into the water streams.
- the work-flow of the typical denim fabric knitting process is as follows: Introduce indigo-dyed yarn and non-indigo-dyed yarn on the knitting machine—knitting—fabric scouring—enzyme treatment—softening—Stenter dressing.
- Knit denim requires use of a special indigo knit yarn but the availability of such yarn is one of the key hurdles to develop this market, besides the cost.
- the use of the indigo knit yarn will induce contamination with coloured fiber dust at the guiding roller and feeders due to the poor rub fastness of the indigo-dyed fiber and yarn surfaces.
- the machine downtimes needed for cleaning are significantly reducing the production efficiency. If the resulting contamination is not completely removed before the next production phase, the resulting yarns will cause significant downgrading of the fabrics made therewith.
- a second yarn containing cellulosic fibers not modified by a cationic modifier is not modified by a cationic modifier.
- the yarn containing cellulosic fibers modified by a cationic modifier can be manufactured by treating it in a package dyeing machine using a substantially colorless cationic crosslinking modifying agent in an aqueous system.
- substantially colorless means in the context of this invention that it has no colour visible by the human eye.
- a suitable colorless cationic crosslinking modifier has at least two, but no more than six functional groups reactive with cellulose.
- the colorless cationic crosslinking modifier is one out of the group containing trimethylammonium compounds and cationic triazin compounds.
- a suitable cationic crosslinking modifier is commercially available under the trade name “EcofastTM CR-2000” from The Dow Chemical Company. The liquid ratio is 1:4 ⁇ 1:10.
- the dosage of the cationic modifier (calculated on dry substance) is 1% ⁇ 10% on weight of fabric (“o.w.f”) with 2-4 g/L of sodium hydroxide.
- the treatment temperature is 40-80° C. for 20-40 minutes.
- the construction of the fabric is such that on the first surface of the fabric mainly the first yarn is visible and on the second surface mainly the second yarn is visible. This is typical for the optical appearance of a denim fabric.
- the fabric may contain a third yarn, in particular an elastane yarn.
- a typical yarn may be a yarn containing 100% RoicaTM elastane fiber with yarn count 20 denier.
- the fabric according to the invention is either a knit fabric or a woven fabric, preferably a knit fabric.
- the fabric is a knit fabric of the tuck and miss stich construction type knitted according to the tuck and miss cam technology; this is crucial to achieve the inventive denim effect by a knit technology.
- a typical knitting machine and machine specification may be a Terrot Single jersey jacquard machine, model SHS-90, with Cylinder Diameter: 26′′, Needle gauge: 28 G, number of feeder: 42, rotation: Anticlockwise.
- machine types and specifications may work as well, if the features according to the invention are realized.
- the first yarn may have a lyocell content of between 30 and 80%. Below 30% lyocell the wanted “fading” or “wash down” effect is not visible; above 80% lyocell the fabric or garment looks dirty upon fibrillation.
- a typical composition may be 50% of Lyocell fibers and 50% of cotton fiber. However variations within the range outlined above are possible and effective, as well.
- the type of yarn is very much depending on the type of the final fabric to be achieved and the skilled in the art will know which yarn to choose.
- a ring spin yarn may be a good choice and for example a yarn count of the first yarn may be Ne 30/2.
- the first yarn may be treated with a cationic modifier.
- concentration of the cationic modifier may be between 0.5 and 5% (w/w) in aqueous solution, preferably between 1.0 and 3.5% (w/w), most preferably between 1.5 and 2,5% (w/w).
- the second yarn is composed of 100% Lyocell fibers. Blends with other cellulosic fibers like cotton, modal etc. are also possible, depending on the touch which should be obtained.
- the yarn count may be Ne 10, spun according to the MVS spinning method.
- the second yarn yarn is not able to absorb reactive dyestuff without using sodium sulphate, sodium carbonate and other dyeing auxiliary.
- FIG. 2 shows a preferred embodiment of the invention:
- a circular single jersey weft knitting machine using the knit, tuck and miss cam is used to construct a even twilling pattern on the fabric and produces a dual-plied denim including a back side and a face side of the fabric.
- the back side is loosely knitted with variable tension/tensile force and a different stitch length than that of face side by adjusting the circular weft-knitting machine.
- Cam arrangements are set for creating terry twill effect and only twill effect on the fabric.
- the face side is compactly constructed with high tension/tensile force by adjusting the machine to a high-density program.
- FIG. 2 shows (from the left to the right):
- a knitting machine program to control the movement action of the knitting needles.
- the fabric is a woven fabric of the denim type.
- the first yarn is the warp yarn and the second yarn is the weft yarn.
- this fabric is a greige, i.e. an essentially colorless or undyed fabric.
- this fabric is dyed to a denim appearance. Therefore a preferred embodiment of the invention is a fabric of essentially blue color, preferably a shade of blue comparable to indigo-dyed cotton fabric. However also other colors (like red, black, green, etc.) are accepted as having a kind of denim appearance. An important aspect of denim appearance in general is the wash-out effect.
- the first yarn contains between 30 and 80% (w/w) of lyocell fibers, the remainder being preferably cotton.
- the second yarn consists of cellulosic fibers, more particularly Lyocell fibers. Blends with other cellulosic fibers like cotton, modal etc. are also possible, depending on the touch which should be obtained.
- the second yarn consists of 100% lyocell fibers.
- the fabric according to the invention contains a third yarn, in particular made of elastane fibers.
- the dye bath consists essentially only of water (with only natural mineral content like tab water)
- the reactive dyestuff or mixture of reactive dyestuffs Depending on the water source it may be necessary to adjust the pH of the water to the range mentioned above first before using it in the process according to the invention.
- the reactive dyestuff may be either a single reactive dyestuff or a composition consisting of a mixture of several reactive dyestuffs blended in a way suitable to obtain the requested color on the fabric.
- the use according to the invention is in particular piece dyeing of the tailored garment containing the fabric according to the invention.
- the first yarn was composed of 50% of Lyocell fibers (from Lenzing Aktiengesellschaft, Austria, under the trade name TENCELTM Lyocell) and 50% of cotton fiber.
- the yarn count was Ne 30/2 with ring spun method.
- the first yarn is treated in a package dyeing machine.
- the cationic crosslinking modifier is commercially available under the trade name “EcofastTM CR-2000” from The Dow Chemical Company.
- the concentration of the cationic modifier is 3% o.w.f (i.e. “on weight of fabric”) of yarn with 2 g/L of sodium hydroxide in the treatment liquid.
- the liquid ratio is 1:6.
- the treatment temperature is 80° C. for 30 min.
- the first yarn was the yarn of Example 1.
- the second yarn was composed of 100% Lyocell fibers (from Lenzing Aktiengesellschaft, Austria, under the trade name TENCELTM Lyocell).
- the yarn count is Ne 10 with MVS spinning method.
- the third yarn was 100% Roica spandex, yarn count 20 denier.
- the knitting machine specification was as follows: Terrot Single jersey jacquard machine, model SHS-90, with Cylinder Diameter: 26′′, Needle gauge: 28 G, number of feeder: 42, rotation: Anticlockwise.
- the knitting program and the structure of the fabric thus obtained were as in FIG. 2 .
- the greige fabric will be heat set at a stenter at 190° C. for 2 minutes before the dyeing process.
- the dyeing process is done by garment dyeing method with the conditions as follows:
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Abstract
This invention relates to a fabric consisting of at least a first yarn containing cellulosic fibers modified by a cationic modifier and a second yarn containing cellulosic fibers not modified by a cationic modifier, and to the use of this fabric in order to obtain a denim appearance.
Description
- This invention relates to a fabric consisting of at least a first yarn containing cellulosic fibers modified by a cationic modifier and a second yarn containing cellulosic fibers not modified by a cationic modifier, and to the use of this fabric in order to obtain a denim appearance.
- Denim is a kind of comfortable, fashionable, durable, casual textile fabric and popular in all age groups and all countries. Due to its typical, unique appearance—in particular the wash-out effect and its reputation as a durable fabric—garments made of denim have a cult item status.
- Essential for this is the dyeing with indigo and the fabric construction, where the outer surface of the fabric in the garment typically is blue and on the inner surface white colour is dominating.
- The traditional denim is woven-made by interlacings of warp and weft yarns feature to create fabric construction with color fading feature and it is normally a stiff, heavy weight and high-density fabric. The fabric construction usually is 3/1 or 2/1 twill and 1/1 chambray construction.
FIG. 1 shows a typical fabric construction. - To obtain the typical denim appearance with a dominantly coloured outside and a dominantly white inside of the garment, a coloured yarn and a white yarn have to be used for the weaving. Usually the coloured yarn is used as the warp yarn while the white yarn is used as the weft yarn. When denim is woven, it is done in such a way that 60% of the material's coloured warp is on the outside of the garment and 40% of the white weft is on the inside. This means, among others, that the weaver has to keep at least two kinds of yarn in stock. If various coloured fabrics are needed, further yarns already dyed to the target fabric colour have to be kept in stock. Yarn dyeing generally is performed in specific dyeing equipment and therefore more costly than e.g. fabric dyeing or piece dyeing. Furthermore, only a very limited number of colours suitable for denim-look dyeing is available.
- Traditionally, indigo dyestuff is commonly used for denim dyeing. The indigo pigment is a kind of water-insoluble vat dye. It has no affinity for the cellulosic fiber. A lot of chemicals like sodium hydroxide and sodium hydrosulfite are required to convert the indigo into a water-soluble form which is a kind of fiber-affinitive leuco form. To convert 1 kg of indigo granules into the leuco form, 0.8 kg of sodium hydrosulfite and 0.67 kg of sodium hydroxide for the reduction process are needed. The work-flow of the typical indigo yarn dyeing process is as follows: Prewetting—rinsing—scouring—rinsing—yarn indigo dyeing (rope dyeing)—rinsing/softening—rebeaming.
- Indigo dyeing even nowadays is done in dye houses with waste water treatment plant and causes high cost for water treatment. Furthermore, the fabrics show low wet rubbing fastness. In a typical indigo yarn dyeing factory where 10 tons indigo yarn per day are dyed with a recipe as follows: Indigo pigment: 4 g/l; Sodium hydrosulfite 3.2 g/l; sodium hydroxide 2.68 g/l; pick-up 70%, 10 dips, the consumption is 280 kg indigo, 224 kg sodium hydrosulfite and 188 kg sodium hydroxide per day, most of it need to treat before going into the water streams. There are over thousand indigo yarn dyeing factories in the world.
- Due to the stiff handfeel of the woven denim, its application is limited in fashion design, especially for the tight-fit garment or seamless garment sector. However, nowadays customers like to have not only a denim look, but also request softness, comfortability while wearing, and lightness. A knit denim can offer such properties much better than a woven denim.
- The work-flow of the typical denim fabric knitting process is as follows: Introduce indigo-dyed yarn and non-indigo-dyed yarn on the knitting machine—knitting—fabric scouring—enzyme treatment—softening—Stenter dressing.
- Knit denim requires use of a special indigo knit yarn but the availability of such yarn is one of the key hurdles to develop this market, besides the cost. Secondly, during the knitting step the use of the indigo knit yarn will induce contamination with coloured fiber dust at the guiding roller and feeders due to the poor rub fastness of the indigo-dyed fiber and yarn surfaces. The machine downtimes needed for cleaning are significantly reducing the production efficiency. If the resulting contamination is not completely removed before the next production phase, the resulting yarns will cause significant downgrading of the fabrics made therewith.
- Conventional reactive dyeing of cotton does not solve these problems: Reactive dyes on cotton do not allow for a wash-out effect and the general problems caused by yarn dyeing are also not vanishing.
- In view of this prior art the problem to be solved was to provide a method to produce fabrics with the typical denim appearance in an economic way without pollution of the environment.
- It is an object of the present invention to provide a fabric consisting of at least
- a. A first yarn containing cellulosic fibers modified by a cationic modifier,
- b. A second yarn containing cellulosic fibers not modified by a cationic modifier.
- The yarn containing cellulosic fibers modified by a cationic modifier can be manufactured by treating it in a package dyeing machine using a substantially colorless cationic crosslinking modifying agent in an aqueous system. “Substantially colorless” means in the context of this invention that it has no colour visible by the human eye.
- A suitable colorless cationic crosslinking modifier has at least two, but no more than six functional groups reactive with cellulose. Preferably the colorless cationic crosslinking modifier is one out of the group containing trimethylammonium compounds and cationic triazin compounds. A suitable cationic crosslinking modifier is commercially available under the trade name “Ecofast™ CR-2000” from The Dow Chemical Company. The liquid ratio is 1:4˜1:10. The dosage of the cationic modifier (calculated on dry substance) is 1%˜10% on weight of fabric (“o.w.f”) with 2-4 g/L of sodium hydroxide. The treatment temperature is 40-80° C. for 20-40 minutes.
- Preferably the construction of the fabric is such that on the first surface of the fabric mainly the first yarn is visible and on the second surface mainly the second yarn is visible. This is typical for the optical appearance of a denim fabric.
- The fabric may contain a third yarn, in particular an elastane yarn. A typical yarn may be a yarn containing 100% Roica™ elastane fiber with yarn count 20 denier.
- The fabric according to the invention is either a knit fabric or a woven fabric, preferably a knit fabric.
- In a preferred embodiment of the present invention the fabric is a knit fabric of the tuck and miss stich construction type knitted according to the tuck and miss cam technology; this is crucial to achieve the inventive denim effect by a knit technology.
- For this embodiment of the present invention the general process route would be as follows:
- Preparation of the yarns (first yarn being modified by a cationic modifier, second yarn not being modified by a cationic modifier)->circular knitting of the first and second yarn by tuck and miss cam technology->fabric dyeing->enzyme treatment->softening->Stenter dressing.
- A typical knitting machine and machine specification may be a Terrot Single jersey jacquard machine, model SHS-90, with Cylinder Diameter: 26″, Needle gauge: 28 G, number of feeder: 42, rotation: Anticlockwise. However machine types and specifications may work as well, if the features according to the invention are realized.
- In a preferred embodiment the first yarn may have a lyocell content of between 30 and 80%. Below 30% lyocell the wanted “fading” or “wash down” effect is not visible; above 80% lyocell the fabric or garment looks dirty upon fibrillation. A typical composition may be 50% of Lyocell fibers and 50% of cotton fiber. However variations within the range outlined above are possible and effective, as well.
- The type of yarn (spinning method, yarn count etc.) is very much depending on the type of the final fabric to be achieved and the skilled in the art will know which yarn to choose. For knit denim a ring spin yarn may be a good choice and for example a yarn count of the first yarn may be Ne 30/2.
- The first yarn may be treated with a cationic modifier. The concentration of the cationic modifier may be between 0.5 and 5% (w/w) in aqueous solution, preferably between 1.0 and 3.5% (w/w), most preferably between 1.5 and 2,5% (w/w). By this treatment the first yarn is able to absorb reactive dyestuff without using sodium sulphate, sodium carbonate and other dyeing auxiliaries.
- In a preferred embodiment the second yarn is composed of 100% Lyocell fibers. Blends with other cellulosic fibers like cotton, modal etc. are also possible, depending on the touch which should be obtained. The yarn count may be Ne 10, spun according to the MVS spinning method. The second yarn yarn is not able to absorb reactive dyestuff without using sodium sulphate, sodium carbonate and other dyeing auxiliary.
-
FIG. 2 shows a preferred embodiment of the invention: A circular single jersey weft knitting machine using the knit, tuck and miss cam is used to construct a even twilling pattern on the fabric and produces a dual-plied denim including a back side and a face side of the fabric. The back side is loosely knitted with variable tension/tensile force and a different stitch length than that of face side by adjusting the circular weft-knitting machine. Cam arrangements are set for creating terry twill effect and only twill effect on the fabric. The face side is compactly constructed with high tension/tensile force by adjusting the machine to a high-density program. -
FIG. 2 shows (from the left to the right): - a. photos of the face side (dark color) and the back side (bright color);
- b. a cross-section of the fabric (B=
yarn 1=first yarn; W=yarn 2=second yarn); - c./d. a knitting machine program to control the movement action of the knitting needles.
- In another preferred embodiment of the present invention the fabric is a woven fabric of the denim type. Preferably the first yarn is the warp yarn and the second yarn is the weft yarn.
- In a particularly preferred embodiment this fabric is a greige, i.e. an essentially colorless or undyed fabric.
- In another particularly preferred embodiment this fabric is dyed to a denim appearance. Therefore a preferred embodiment of the invention is a fabric of essentially blue color, preferably a shade of blue comparable to indigo-dyed cotton fabric. However also other colors (like red, black, green, etc.) are accepted as having a kind of denim appearance. An important aspect of denim appearance in general is the wash-out effect.
- Preferably the first yarn contains between 30 and 80% (w/w) of lyocell fibers, the remainder being preferably cotton.
- Preferably the second yarn consists of cellulosic fibers, more particularly Lyocell fibers. Blends with other cellulosic fibers like cotton, modal etc. are also possible, depending on the touch which should be obtained. In a particularly preferred embodiment the second yarn consists of 100% lyocell fibers.
- In a further preferred embodiment the fabric according to the invention contains a third yarn, in particular made of elastane fibers.
- It is a further object of the present invention to use the fabric described above in a process for making a fabric with denim appearance by dyeing the fabric described above with a reactive dyestuff at a pH of between 6.0 and 8.0, preferably at a pH of between 6.5 and 7.5 in the absence of salt (i.e. the dye bath consists essentially only of water (with only natural mineral content like tab water)) and the reactive dyestuff or mixture of reactive dyestuffs. Depending on the water source it may be necessary to adjust the pH of the water to the range mentioned above first before using it in the process according to the invention.
- According to the invention the reactive dyestuff may be either a single reactive dyestuff or a composition consisting of a mixture of several reactive dyestuffs blended in a way suitable to obtain the requested color on the fabric.
- In a preferred embodiment the use according to the invention is in particular piece dyeing of the tailored garment containing the fabric according to the invention.
- It is yet a further object of the present invention to provide a use of a fabric according to the invention for the manufacture of garments, in particular jeans, jackets, shirts and blouses. Those garments then will show a denim appearance.
- The invention will now be illustrated by examples. These examples are not limiting the scope of the invention in any way. The invention includes also any other embodiments which are based on the same inventive concept
- Cationic Treatment (Yarn):
- The first yarn was composed of 50% of Lyocell fibers (from Lenzing Aktiengesellschaft, Austria, under the trade name TENCEL™ Lyocell) and 50% of cotton fiber. The yarn count was Ne 30/2 with ring spun method.
- The first yarn is treated in a package dyeing machine. The cationic crosslinking modifier is commercially available under the trade name “Ecofast™ CR-2000” from The Dow Chemical Company. The concentration of the cationic modifier is 3% o.w.f (i.e. “on weight of fabric”) of yarn with 2 g/L of sodium hydroxide in the treatment liquid. The liquid ratio is 1:6. The treatment temperature is 80° C. for 30 min.
- Knitting of the Fabric:
- The first yarn was the yarn of Example 1. The second yarn was composed of 100% Lyocell fibers (from Lenzing Aktiengesellschaft, Austria, under the trade name TENCEL™ Lyocell). The yarn count is Ne 10 with MVS spinning method. The third yarn was 100% Roica spandex, yarn count 20 denier.
- The knitting machine specification was as follows: Terrot Single jersey jacquard machine, model SHS-90, with Cylinder Diameter: 26″, Needle gauge: 28 G, number of feeder: 42, rotation: Anticlockwise. The knitting program and the structure of the fabric thus obtained were as in
FIG. 2 . - Dyeing and Finishing Process (Fabric)
- The greige fabric will be heat set at a stenter at 190° C. for 2 minutes before the dyeing process. The dyeing process is done by garment dyeing method with the conditions as follows:
-
Liquid ratio: 1:10 Scouring process: 60° C. × 20 minutes Dyeing process: 60° C. × 30 minutes Dyeing recipe: Avitera Deep Blue SE: 2% on weight of fabric Avitera Red SE: 0.2% on weight of fabric Enzyme wash process: 50° C. × 30 minutes Enzyme wash recipe: 1 g/l Tanazyme CM 0.2 ml/l acetic acid Softening Process: 40° C. × 30 minutes Softening recipe: 1% Persoftal Nano SIL
Claims (18)
1. A fabric comprising
a. a first yarn comprising cellulosic fibers modified by a cationic modifier, and
b. a second yarn comprising cellulosic fibers not modified by a cationic modifier.
2. The fabric according to claim 1 , wherein the construction of the fabric is such that on a first surface of the fabric mainly the first yarn is visible and on a second surface mainly the second yarn is visible.
3. The fabric according to claim 1 , wherein the fabric is either a knit fabric or a woven fabric.
4. The fabric according to claim 3 , wherein the knit fabric is a tuck and miss stich construction.
5. The fabric according to claim 3 , wherein the woven fabric is denim.
6. The fabric according to claim 1 , wherein the fabric is a greige fabric.
7. The fabric according to claim 1 , wherein the fabric is dyed to a denim appearance.
8. The fabric according to claim 1 , wherein the first yarn comprises between 30 and 80% (w/w) of lyocell fibers.
9. The fabric according to claim 1 , wherein the second yarn consists of cellulosic fibers.
10. The fabric according to claim 1 , further comprising a third yarn, wherein the third yarn is an elastane yarn.
11. A method of making the fabric of claim 1 having a denim appearance, comprising dyeing the fabric with a reactive dyestuff at a pH of between 6.0 and 8.0, in the absence of salt.
12. The method according to claim 11 , wherein the reactive dyestuff is a composition comprising a mixture of several dyestuffs.
13. A tailored garment comprising the fabric according to claim 1 .
14. A garment comprising the fabric according to claim 1 .
15. The fabric according to claim 3 , wherein the fabric is a knit fabric.
16. The fabric according to claim 9 , wherein the second yarn is 100% lyocell fibers.
17. The method according to claim 11 , wherein the pH of the reactive dyestuff is between 6.5 and 7.5.
18. The garment of claim 14 , wherein the garment is a pair of jeans, a jacket, a shirt or a blouse.
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EP19155245.4A EP3486356A3 (en) | 2019-02-04 | 2019-02-04 | Denim fabric and its use |
EP19155245.4 | 2019-02-04 | ||
PCT/EP2020/052440 WO2020161016A1 (en) | 2019-02-04 | 2020-01-31 | Denim fabric and its use |
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EP (2) | EP3486356A3 (en) |
JP (1) | JP2022519847A (en) |
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CN113481740A (en) * | 2021-07-01 | 2021-10-08 | 韶关市北纺智造科技有限公司 | Dyed jean fabric and preparation method thereof |
EP4361344A1 (en) * | 2022-10-28 | 2024-05-01 | Swiss Performance Chemicals AG | Indigo-free fabric with denim visual appearance |
CN116446197A (en) * | 2023-03-30 | 2023-07-18 | 广州迅捷数码科技有限责任公司 | Active yarn-dyed fabric and production method and application thereof |
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AT413825B (en) * | 2003-03-13 | 2006-06-15 | Chemiefaser Lenzing Ag | METHOD FOR DYING A MIXTURE OF TWO OR MORE DIFFERENT FIBER TYPES |
US9689092B2 (en) * | 2013-10-14 | 2017-06-27 | Invista North America S.A R.L. | Stretch circular knit fabrics with multiple elastic yarns |
CN108611881B (en) * | 2018-04-11 | 2021-02-19 | 华南理工大学 | Preparation method of cellulose fiber white-left dyed fabric |
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WO2020161016A1 (en) | 2020-08-13 |
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TW202030390A (en) | 2020-08-16 |
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