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This study aimed to ex situ colorize laccase-entrapped bacterial cellulose (BC) with natural phenolic dyes, namely,madder, turmeric, and cochineal, and to determine the effect of laccase entrapment on the dyeability of BC using color strength (K/S) analysis. Results showed that laccase entrapment improved the dyeability of BC and that pre-entrapment was the most effective method, compared with meta-entrapment and post-entrapment methods. In addition, surface characterizations confirmed the successful entrapment of laccase inside the BC nanostructure and retention of the cellulosic and crystalline structures of BC. The washing durability test confirmed that the K/S value of BC had improved after laccase entrapment. Furthermore, laccase-entrapped BC colorized with cochineal dye had the highest washing durability due to the high molecular weight of cochineal dyerelative to the other dyes. This study suggests a novel method for enhancing the dyeability and washing durability of BC colorized ex situ with natural phenolic dyes by laccase entrapment.

The present paper illustrates an unconventional but green exhaust dyeing process of cotton, in which the conventional reduction step of the indigo dyeing process is eliminated following the substitution of the insoluble indigo by the soluble indigo carmine. Indigo carmine can meet ecological requirements in terms of chemical consumption reduction, cleaner releases, and biodegradability. However, this dye produces unsatisfactory dyeing quality compared to indigo. In order to enhance dyeing quality, cotton samples were treated with Sera Fast GMX (a cationic agent) before they were dyed with indigo carmine. The influence of dyeing parameters (i.e., indigo carmine concentration, dyeing temperature, dyeing duration, and sodium carbonate concentration) on the evolution of the color strength (K/S) was studied. A response surface design was employed to optimize this unconventional dyeing process. The addition of salt to the dye bath appeared to improve both color strength and fastness properties. Finally, the effect of treating cationized cotton samples with microwave radiations was investigated. The results showed that exposure to microwave radiation for 5 min resulted in improvements in dyeing quality.

This study investigated different dyeing conditions for a cross bobbin acrylic cotton blend yarn, with the aim of identifying, through the bleaching of cotton fiber. Interference from the addition ...

Nowadays, using sustainable dyeing process has become a necessity, but does not meet performance requirements. Application of biomordants was recommended to enhance the quality of dyeing. Tannin-based biomordants appeared advantageous in green dyeing; meanwhile, unconditional affinity towards fibers of different types has attracted the attention of researchers. We introduce the idea of using combination of natural mordant as a new technique for sustainable dyeing of wool and a model natural fiber. In this study, Iranian madder was used as green dye and Yellow Myrobalan (YM) and Black Myrobalan (BM) employed as biomordant. FTIR-ATR spectra of the washed, mordanted, and mordanted-dyed wool fibers confirmed appropriate bonding among wool fibers, green mordant, and dye molecules. The superior color strength of wool fibers dyed with 4 %YM+6 %BM and 40 % madder was featured by K/S value of 35.77 and was obviously higher than that of madder by sumac, 9.5. Fastness properties (light, wash, and rub fastness) of wool dyed with combination of YM and BM were good.

In this study, the dyeing performance and antibacterial properties of pomegranate (Punica granatum) peel extracts were investigated, when applied to hemp fabric. A tannin-rich natural dye was extracted using water at 100°C. As the antibacterial agent was sensitive to temperature, it was extracted using Soxhlet apparatus with methanol at 55°C. The color strength (K/S) values were investigated and found to increase in line with the dye concentration, dyeing time, and temperature. Optimal dyeing of the hemp fabric was achieved when applying 6% w/v of extract at 80°C for 60 min. This produced a yellowish-brown appearance. The dyed fabrics were rated as good to excellent for color fastness against washing, water, sea water, and perspiration. The dyed fabrics were next finished with the antibacterial agent extracted from the peel and tested for activity against Staphylococcus aureus (Gram positive) and Klebsiella pneumoniae (Gram negative), using the AATCC-100 (percentage reduction) test. The fabric was demonstrated to be 99.99% effective against Staphylococcus aureus, and this was conserved across 20 wash cycles.

Nowadays, polyester fibers/filaments are undergoing innovations to keep their first place in the textile markets. This paper is devoted to study the physical and chemical properties of polyesters filaments with different geometries and their influence on dyeing performances. Four kinds of filaments were studied and compared: PET monofilaments with two different geometries, (A) circular and (B) cross-sectional shapes, (C) PTT monofilaments with tetra-channel shapes, and (D) bicomponent PET/PTT filaments. Different tools have been used to characterize studied filaments by determination their morphological behaviors, structures as well as their thermal and mechanical properties. Dyeing process of these polyester filaments was also investigated using a C.I Disperse Yellow 211 dye. The effects of dyeing parameters (temperature, time and carrier concentration) on dyeing performances (color strength and CIELab coordinates) were then studied and optimized used Box–Behnken experimental design. The comparing results showed that the filaments (D) give an excellent dyestuff affinity. Finally, samples dyed under optimum conditions showed that those knitted using filaments (D) present the highest strength color (25.3), followed by filaments (B) (21.4), filaments (C) (19.9) and filaments (A) (19.4).

In this research work, an attempt has been made to investigate the possibility of wool dyeing with natural dye extracted from the Cinnamomum camphora middle aged/mature leaves. Visually, a range of...

Endeavour has been made in this research work using experimental data for constructing a fuzzy inference model based on the Mamdani approach to prognosticate the shrinkage and mass per unit area of a single jersey cotton knitted fabric. To control the dimensional stability of the cotton knitted fabric in advance, an artifi cial intelligent system is required in the knitting industry which simulates all product and process variables and is able to give human-like decisions in advance. The most important controlling parameters of knitted fabric properties such as stitch length, yarn count and overfeed percentage in stenter were considered as input variables, and mass per unit area, lengthwise shrinkage and widthwise shrinkage as output variables. Overall, 35 experiments were conducted to construct the model, varying different parameters. The applicability of the model was validated by comparing the results from 15 newly conducted experiments. The coeffi cient of determination of predicted and actual data for mass per unit area, lengthwise shrinkage and widthwise shrinkage were 0.97, 0.99 and 0.99, respectively which validates the model relatively effectively for an industrial application. The proposed model can assist a fabric manufacturer by taking a decision in selecting knitting and fi nishing parameters prior to producing the fabric. Moreover, it can reduce the time and energy required, and waste produced in the process by skipping the sample development step before bulk production.

A large amount of salt has been used in reactive dyeing of cotton. In this study, the reduction in the amount of salt used in reactive dyeing of cotton fabric after the sericin application by different methods was investigated in detailed. The effects of different cross-links (citric acid and butane tetracarboxylic acid) for the bonding of the sericin to the cotton fabric were also investigated. The results were evaluated in terms of color coordinates and color strength, washing and rubbing fastness, and crease recovery angle. Presence of the sericin onto cotton fabric after the application was evidenced with FT-IR spectra. The application of sericin and subsequent dyeing resulted in similar color depths to the conventional dyeing even with half the salt used in conventional reactive dyeing. The presence of cross-links in the pre-treatment baths did not reveal significant differences in color strengths compared to used only sericin. The fastness values of reactive dyed fabrics after sericin application had similar fastness values with traditional dyed ones. Crease recovery angles showed an increase after sericin pre-treatment. Sericin application before reactive dyeing could be one of the best alternative ways to reduce salt usage in reactive dyeing.

Scouring is necessary for the loom state jute fabrics in order to make them suitable for dyeing and finishing by improving their wettability by removing non-cellulosic matters from the fiber. Scouring is carried out at the boil with a cocktail of caustic soda, detergent, and wetting agent, and the process is energy-intensive. In this work, bio-scouring of jute fabrics was carried out using four kinds of enzymes, Esperase 4.0T (protease), xylanase, and Alcalase 2.5 L (alkaline protease) in a combination with cellulase. The performance of scouring of jute fabrics scoured with various enzymes was evaluated by measuring their whiteness index, hydrophilicity, wettability, and dyeability, and was compared with jute fabrics scoured by the traditional alkali scouring method. The effect of bio-scouring on the weight loss and tensile strength loss was assessed. Of the enzymes investigated, the combined treatment with 50/50 mixture of Alcalase and cellulase provided the best performance in terms of improvement in whiteness index, hydrophilicity, wettability, and dyeability, but also caused the highest loss in tensile strength. The conventional alkali scouring caused higher weight and tensile strength loss compared to enzymatic scouring treatments investigated, but produced poor whiteness index and also poor color strength when the treated jute fabrics were dyed with a direct dye and two reactive dyes. The developed treatment could be used in industry as an ecofriendly bio-scouring process.

A fuzzy prediction model has been built based on hydrogen peroxide concentration, bleaching temperature, and time of bleaching as the input variables and knitted cotton fabric bursting strength as the output variable. Fuzzy expert systems can map efficiently in nonlinear domains with minimal experimental data. The model developed in the present study has been validated by new experimental data. The root mean square, mean absolute error percentage, and coefficient of determination ( R 2 ) between the predicted and experimental values were found to be 4.89, 0.707, and 0.965 respectively. The results confirm that the model can be applied successfully for the prediction of fabric bursting strength in textile dye houses.

Jackfruit latex gum was applied to pigment printing of cotton fabrics as a binder and their printing properties were compared with those of conventional pigment printing. The printing performances were influenced by the content of Jackfruit latex gum in the binder and the curing conditions. Based on a series of experiments, the pigment printing paste recipe and the process were optimized, considering color fastness, color strength, and fabric handle properties compared with those of the synthetic binder. The use of combined binder containing Jackfruit latex gum for pigment printing showed reasonable printing performances and offers an option for replacing synthetic binders, which cause adverse effect on human health and environments.

Cotton fabrics were pre-treated with 4-vinylpyridine before dyeing to increase dye uptake. Various treatments for the application of monomers to fabrics were tried in different combinations and after dyeing the best result was obtained with alkali impregnation and monomer exhaustion. After decisions had been made on the processes to be applied before dyeing, different amounts of monomer, dyestuff and salt were used in reactive dyeing baths at different pHs. The results were evaluated in terms of color coordinates, color strength, FT-IR and fastness to washing, rubbing and perspiration. The best results were obtained with 3 ml of 4-vinylpyridine dissolved in 10 ml of alcohol, in the presence of 25 g L−1 of salt and in neutral medium at 5% dyestuff concentration. Color strength from this dyeing process was higher than from the conventional dyeing at the same dyestuff concentration. FT-IR analysis demonstrated the presence of monomer on the surface of the fabric. Fastness values showed that this method could be used as an alternative to the conventional method.

Application of naturally dyed fabrics is increasing due to the biological protection, pollution control, ecology and improved quality of life of human beings. Antimicrobial textiles can be the best choice to avoid fabric related infection. Many plants have been regarded as suitable for extraction of natural dyes that can also show good antibacterial activity. However, in this work, natural dye from pomegranate peel was extracted by ultrasonic method and then lyocell fabrics were treated with different mordanting agents. Afterwards, mordanted fabric samples were dyed by exhaust dyeing. Dyed samples were analyzed with rubbing, washing, perspiration and light exposure tests for color fastness. The results revealed that different types of mordants have dissimilar effects on color efficiency and color range values of dyed lyocell fabrics. The dyed fabric with different mordants showed excellent color strength (K/S) values (6.4) and color fastness properties of washing (4–5), light (5–6), rubbing (4–5) and perspiration (4–5). Furthermore, FTIR confirmed that no structural change occurred in the lyocell fabric before and after the dyeing process. Additionally, antimicrobial properties of un-dyed and dyed with pomegranate peel were assessed against Staphylococcus aureus (ATCC® 25923™) by the agar diffusion test method. The obtained antimicrobial activities of the samples dyed with pomegranate peel were compared with that of the un-dyed samples. The un-dyed samples displayed slight antibacterial properties while fabrics dyed with pomegranate peel exhibited suitable antibacterial properties. Thus, lyocell fabrics dyed with pomegranate peel are useful for biomedical applications.

The current approach focuses on studying the leverage of nanosilver (AgNPs) incorporation on the dyeing process of viscose fibers by blue reactive dye. Nanosilver was straightway incorporated into viscose fibers using sodium citrate as nanogenerator. Owing to AgNPs incorporation, color of fibers was turned to greenish-blue and darker greenish color was observed with low Ag content (

The paper describes the photochemical stability of a commercial triphenodioxazine dye (Reactive Blue_204) linked onto a cotton fabric. Preliminary studies have shown that as a result of irradiation, the dye and its photodegradation products can pass directly onto the skin under conditions that mimic human perspiration and cause side-effects. The cotton dyed fabric was photo irradiated at different time intervals. Standard methods were employed to evaluate the color strength at various levels of pH, temperature, dyeing contact time, and salt concentration. The influence of UV radiation at different doses (λ &gt, 300 nm) on the structural and color modifications of the dyed cotton fabrics was studied. Structural modifications before and after irradiation were compared by applying FTIR, UV–Vis, and near infrared chemical imaging (NIR–CI) techniques. Color modifications were investigated with the CIELAB system. Color differences significantly increased with the irradiation dose. High irradiation doses caused changes in the dye structure.

A novel low add-on dyeing process of cotton fabric with C.I. Reactive Black 5 has been implemented successfully with the assistance of dye-jet ejector units to produce precise wet pick-up ranging from 20% to 50%. The steaming process of the low add-on technology was investigated through evaluating the effects of relative humidity, steaming temperature, steaming time and water ratio on the surface temperature of the wet fabric and their influence on the dye properties, as well as the effect of the wet pick-up on dye properties. The optimal dyeing process was also conducted, including build-up properties and the concentrations of the alkaline agent and the electrolyte via the evaluation of the color strength ( K/ S value) and dye fixation rate. A comparison was made between the novel low add-on dyeing process and conventional dyeing process by assessing the dye properties, color shade and color levelness. The results indicated that the fabric dyed with the low add-on process had excellent washing fastness, rubbing fastness, a similar color shade and superior levelness in comparison with conventional one-bath pad-steam dyeing.

Cotton fabric was modified with β-cyclodextrin (β-CD) forming inclusion complex to yield color strength, pattern sharpness, and color fastness for ink-jet printing. The modified cotton fabric was confirmed with the presence of new strong absorption peaks around 1713 cm-1 and 1243 cm-1 in FT-IR. β-CD had been covalently grafted on cotton fabric via the esterification reaction of citric acid (CTR) with cellulose and β-CD. The results indicated that printing performances of the ink-jet printed fabric were enhanced through β-CD modification. The K/S value was enhanced from 4.21 to 6.72, the width of printed line was decreased from 1.48 mm to 1.25 mm, and the color fastness was improved to 3-4 level. These improvements were due to the truncated cone structure of β-CD, which can form inclusions with water-based pigment. Meanwhile, the crease recovery performance was also improved with the aid of CTR. A comparison between the unmodified and modified cotton fabric suggested that the crease recovery angle of β-CD modified cotton fabric was increased by 25.0 % in the warp direction. Therefore, printing performance and crease recovery performance of β-CD modified and water-based pigment printed cotton fabric were enhanced remarkably.

Persimmon dye is a natural dye potentially used to promote sustainable textile industry. In this article, cotton and wool fabrics were dyed with persimmon dye. The performance of the dye was characterized using color strength and appearance analysis (ColorQuest), American Association of Textile Chemists and Colorists colorfastness tests, and Fourier transform infrared spectroscopy (FTIR). The results showed color strength of dyed cotton and wool fabrics was enhanced with increasing dye concentration and dyeing times. The comparison between cotton and wool suggested persimmon dye exhibits better dyeing performance (higher color strength and higher colorfastness ratings) on wool fabrics than on cotton fabrics. The FTIR analysis indicated no significant chemical reactions or changes in persimmon dye occurred to dyed fabrics, suggesting negligible impact on chemical and physical properties of the dyed fabrics. The reported results are valuable in exploring the opportunity of using persimmon dye as a useful natural dye for a sustainable textile dyeing industry, especially in the case of dyeing natural fibers.

Two derivatives of 3-amino-4-arylazo-1-phenylpyrazol-5-one have been used for dyeing un-irradiated and irradiated polyester and nylon fabrics using different absorbed doses of Co-60 gamma irradiation to study the effect of radiation treatment on the color strength of dyed fabrics. The data color report is used for the evaluation of un-irradiated and irradiated dyed polyester and nylon using GretagMacbeth spectrophotometer (CE 7000a) in CIE Lab system. The color strength K/S of the dyed polyester and nylon fabrics was increased by increasing the absorbed dose to 80 kGy. It is found that gamma irradiation has a potential to improve the fastness properties such as light, rubbing, perspiration, and washing.

The current research is intended to investigate the effect of gamma radiation on the cotton fabric and compare the dyeability of gamma irradiated fabric with that of chemically mercerized fabric using reactive dye, Reactive Violet H3R. The gray cotton fabric samples were desized and bleached, before being mercerized or irradiated, followed by dyeing with reactive dye. The cotton fabric was exposed to variable absorbed doses of 2–10 kGy. The color strength values at various levels of temperature, pH, dyeing time, and salt concentration were evaluated using optimal conditions of mercerization and gamma-ray treatment. The comparison of color strength values for the mercerized and the gamma irradiated cotton fabric showed that the irradiated fabric had high color strength at 60 °C using dye bath of pH10 in the presence of 6 g/L of exhausting agent while dyeing for 40 min. Both mercerization and irradiation increased the surface area of fibers that substantially elevated the dyeing performance and fast...

In this study, the cationic Poly[Styrene-Butyl acrylate-(P-vinylbenzyl trimethyl ammonium chloride)] P(St-BA-VBT) nanospheres with N+(CH3)3 functional groups were successfully synthesized by soap-free emulsion polymerization and applied to different fabrics by pad-cure process. After the pad-cure process, the nanospheres were deposited on the surface of the modified cotton fibers successfully without forming a continuous film structure. The X-ray Photoelectron Spectroscopy (XPS) and the Fourier transform infrared (FTIR) results demonstrated that P(St-BA-VBT) nanospheres were adsorbed on the surface of cotton fibers successfully. The excellent color strength value and outline sharpness of the plain, twill, and honeycomb fabrics can be achieved when the nanosphere concentration, sodium bicarbonate, and steaming time were 1 g/L, 10 g/L, and 6 min, respectively. The plain fabrics exhibited the smallest color strength (K/S) values and the best outline sharpness, followed by twill and honeycomb fabrics, which displayed the largest K/S values and the worst outline sharpness after the same treatment. Besides, all the three fabrics showed excellent rubbing fastness and washing fastness. The cationic P(St-BA-VBT) nanospheres modification of the cotton fabrics provides a novel potential approach to obtain good printing efficiency without affecting the tensile breaking strength of cotton fabrics significantly.

A series of disazo pyrazole disperse dyes were synthesized and reported at our previous work. These 8 synthesized disazo pyrazole disperse dyes (3a-3h) were applied to poly(lactic acid) (PLA), poly(ethylene terephthalate) (PET), and polyamide 6.6 fibers. Their colorimetric and color fastness properties were investigated. All studied fibers dyed with these synthesized dyes exhibited yellow-red shades. 3c (p-Cl), 3e (m-Cl), and 3h (o-Cl) disazo disperse dyes, having auxochrome -Cl, led to the lowest color yield values for all three studied fibers. The same dyes resulted in higher color strength with darker shades on the PET and PLA fabrics in comparison PA 6.6 fabrics. 3a (p-NO2), 3b (p-OCH3), 3d (m-NO2), 3f (o-NO2), and 3g (o-OCH3) disazo disperse dyes can be recommended for PLA and PET dyeing from the color point of view leading to medium to heavy depth of shades. The wash, alkaline and acidic perspiration, dry and wet rub, water and sea water fastness levels of PLA, PET, and PA 6.6 samples dyed with 3a-3h dyes were generally quite high and in the commercially acceptable range with few exceptions. Dyed PLA fabrics displayed better sublimation fastness levels than dyed PET and PA 6.6 fabrics. Synthesized disperse dyes resulted in high light fastness performance on especially PET and PLA fibers. Light fastness level was better for dyed PET samples by comparison with dyed PLA and PA 6.6 fabrics. © 2018, The Korean Fiber Society and Springer Science+Business Media B.V., part of Springer Nature. Firat University Scientific Research Projects Management Unit: 2012FBE035 This study is sponsored and supported by Pamukkale University Scientific Research Project Coordination Unit PAUBAP by the project number of 2012FBE035.

Today nanofibers are used widely in a variety of applications. Among many investigations of nanofiber characteristics, their color features have been studied scarcely. In this study, nanofiber yarns were colored using two different methods: exhaustion dyeing and colored solution electrospinning or dope dyeing. In the first method, nylon66 nanofiber yarns were produced and then dyeing process was followed at different dye concentrations. In the second method, colored nanofiber yarns were produced directly using the yarn electrospinning setup. Through the spectrophotometric measurements, it was illustrated that the color saturation increases by increasing the dye content in the dyeing bath and electrospinning colored solution. At the end, the nanofiber yarns with equal dye content were produced using two mentioned methods. It was observed that the color strength of dope-dyed samples was lower than the dyeing process samples, but their levelness was better than the samples of dyeing process. Chromatic values...

The influence of coloration on ultraviolet (UV) protection of cotton knitted fabrics with different knit structures incorporated with the three major stitch types, namely knit, tuck and miss stitches, are studied in four approaches. The effects of color depth and knit structures on the ultraviolet protection factor (UPF) of fabrics are investigated. The influences of hue and color depth on the UPF of fabrics are also compared. Since UV protection offered by dyes mainly depends on their chemical structures, the UPF and color strength of fabrics colored by reactive dyes that varied in reactive groups, such as mono-functional and bi-functional reactive dyes, are examined. The correlations between UPF and the CIELAB color coordinates, color strength ( K/ Ssum), are analyzed. The results show that light-colored fabrics with compact structures achieve similar or even better UV protection than the dark-colored fabrics with loose structures. This implies that color property might not be a reliable indicator for UV protection of knitted fabrics and the effect of coloration on UV protection is affected by fabric construction. The results also denote that the chemical structure of reactive dyes affects the UV protection of fabrics in a qualitative approach that depends on the unique ultraviolet radiation blocking ability of the chemical constituents. Among the color coordinates investigated, only lightness ( L*) and K/ Ssum are found to be correlated with the UPF of the fabrics, but the strength of correlations is not very strong. This is because the fabric characteristics that have significant impacts of UV protection are mostly not involved in the measurement of color properties.

This study lays bare two main objectives. The first is to determine the amount of anthocyanins in the leaves of Vitis vinifera L. by the spectrophotometric method and the second is to dye cationized and non-cationized cotton fabrics with the V. vinifera L. leaves aqueous extract. We have thoroughly investigated the effects of dye bath pH and temperature on the dyeing proprieties of the aforementioned fabrics. The color strength (K/S value) of dyed cationized cotton fabrics (K/S = 12) has been better than the non-cationized ones (K/S = 4). Experimental results show that the fastness properties of dyed cationized cotton fabrics range from average to good. We find that the cationization of cotton fabrics has largely improved the dyeability and fastness properties of cotton fabrics dyed with V. vinifera L. leaves aqueous extract.

The azo and styryl disperse dyes were synthesized by using 2-hydroxy-1,4-naphthoquinone (Lawsone) 1 and different substituted aromatic anilines and/or aldehydes. The structures of the dyes were confirmed using FT-IR, 1H-NMR, MS, and HRMS spectral analysis. The dyes displayed a broad absorption maximum in the visible region between 426 and 490 nm. The present paper deals with the application of azo and styryl disperse dyes on polyester and nylon fiber, color characteristics, and fastness properties. The color strength (K/S value) has been found to be very good in all dyed polyester samples. The color fastness with respect to light exposure, washing, and rubbing was quite satisfactory for all dyed polyester compared to the nylon samples.

The aim of this study was to investigate the effect of cotton fiber and yarn characteristics on the color variation of woven fabrics dyed with vat dyes. A fabric length of 31 m was woven so that each meter of the fabric comprised weft yarns of slightly different cotton fiber or yarn characteristics as compared to the other. The woven fabric was pretreated and dyed with vat dyes using industrial-scale, pad-dry-chemical-pad-steam process. After dyeing it was found that the fabric containing weft yarns made from cotton with higher reflectance (Rd) values gave poor color strength as compared to that of lower Rd values. Fabric comprising combed weft yarns showed better color depth (K/S) values as compared to that comprising carded weft yarns made from the same raw cotton. Furthermore, the fabric comprising finer- or lower-twist weft yarns gave higher color depth as compared to that with coarser or higher-twist weft yarns. It was concluded that slight variations in the cotton or yarn characteristics in the weft...

The chemical structure of a new gemini dicationic imidazolium ionic liquid, 3,3′-[1,2-ethanediylbis (oxy-2,1-ethanediyl)]-bis[1-methyl-imidazolium]-dibromide (PEG150-DIL) was established by 1H-NMR and elemental analyses. Then, PEG150-DIL was applied to pretreat ramie fiber. PEG150-DIL treated ramie fiber was characterized by FT-IR, XRD, DSC-TG and FE-SEM. Finally, the mechanical and dyeing properties of PEG150-DIL pretreated ramie fibers were studied. The optimum condition of PEG150-DIL modification was carried out at 100 °C for 30 min. The color strength increased obviously with the duration time and temperature of the PEG150-DIL. The tensile strength and strength retention of PEG150-DIL -treated ramie fibers decreased with the increase of pretreating time and temperature. The tensile strength retention was 86.20 % under optimal PEG150-DIL pretreating condition (100 °C, 30 min).

A new series of anthraquinoid red dyes were synthesized with 1-amino-2-bromo-4-hydroxyanthraquinone and nalkylphenols to dye UHMWPE fibers with high light fastness. Their dyeability was examined depending on the length of alkyl chains. As the length of alkyl substituents increases, the dyeability toward UHMWPE fibers improves rapidly from methyl to ethyl substituents and maintains almost same level of color strength, and then decreases from heptyl to octyl groups. The color strength of dyeings increased dramatically with the increase of dyeing temperature from 100 °C to 130 °C. The maximum build-up was shown at around 5 % owf dye amount. From the dyeing rate, equilibrium dyeing was achieved at around 5 h at 130 °C. All kinds of fastnesses were good enough showing higher than ratings 4-5 to washing and rubbing for the longer alkyl substituents. Especially, much improvement was achieved in light fastness showing ratings 4, which was higher than ratings 2 of the previous study.

This study optimizes a suitable dyeing method for polylactic acid (PLA) fabrics using disperse dyes. Forthis, disperse red 60 (DR 60), disperse blue 56 (DB 56), and disperse yellow 54 (DY 54) were used anddyed on PLA fabrics dependent of dyeing temperature and time. The fastness of PLA fabrics dyed withthree disperse dyes were evaluated; in addition, dye exhaustion, color strength (K/S value), and colorimetricproperties of PLA fabrics were compared with PET fabrics. The experiments indicated optimum dyeabilityof PLA fabrics with disperse dyes. The dyeing temperature was 90 o C for every dye and the dyeing timewere 20 min, 60 min, and 40 min for DR 60, DB 56, DY 54, respectively. PLA fabrics had good color fast-ness to washing, dry cleaning fastness, hot pressing fastness, rub fastness, and perspiration fastness by DR60, DB 56, and DY 54. The dye exhaustion of PLA fabrics were lower than PET fabrics; however, K/Svalues were higher than PET fabrics.Key words: PLA (Polylactic acid), Dyeing properties, Disperse dye, Fastness; 폴리유산 섬유, 염색특성,분산염료, 염색견뢰도

A convenient method for in situ synthesis of silver nanoparticles was developed to realize the multifunction of cotton. The silver nanoparticles were obtained through reduction of silver ions by cotton under basic condition at room temperature. The as-synthesized silver nanoparticles achieved the coloration of cotton fibers. Heating increased the color strength of cotton fibers with silver nanoparticles. Mercerization treatment as a common finishing process enhanced the properties of cotton fibers modified by silver nanoparticles. The mercerized cotton exhibited brighter color and had very good colorfastness to washing. The cotton fibers treated with in situ synthesized silver nanoparticles possess strong antibacterial activity with excellent washing durability.

Hyperbranched polymers (HBPs) are highly branched, three-dimensional and polydisperse macromolecules and have been employed for modification of poly(ethylene terephthalate) (PET) fabrics. The PET fabrics treatment process parameters, like HBP concentration, temperature and time, play a major role in treatment yield and dyeability of treated PET fabrics by acid dyes. Two different quantitative models, comprising response surface methodology (RSM) and artificial neural networks (ANN), were developed for predicting color strength (K/S value) of treated fabrics. The experiments were conducted based on central composite design (CCD) and a mathematical model was developed. A comparison of the predicted color strength using RSM and ANN was studied. The results obtained indicated that both RSM and ANN models show a very good relationship between the experimental and predicted response values. However, the ANN model shows more accurate results than the RSM model.

Treatment of polyacrylonitrile (PAN) onto m-aramid fabric was carried out by pad-dry-cure method using dimethylformamide (DMF) dissolved acrylic fiber solution. The obtained PAN treated m-aramid fabric was dyed using exhaustion method with basic dyes. The effect of PAN treatment on fabric stiffness property was acceptable with acrylic fiber solutions ranging from 1 wt% to 4 wt%. Whilst, more than 4 wt% PAN treated fabrics exhibited undesirable stiffness. The dyeing results showed that PAN treated m-aramid fabrics exhibited a significant increase in color strength when compared to untreated fabric, arising from an increase in anionic dye sites (styrene SO3− group). Wash fastness was comparable to that of untreated fabric, indicating the strong interaction between dye molecules and the PAN. Rubbing fastness of treated fabrics was not affected by treatments with PAN concentrations lower than 4 wt%. Further increase in PAN concentration led to poorer rubbing fastness property due to the problem of surface dyeing. For light fastness, the PAN treatment failed to improve the light fastness property which is the main disadvantage of basic dyeing of aramid fabric. Finally, in case of PAN treatments with the range of 1 wt% to 4 wt%, the flame retardancy property of PAN treated m-aramid fabrics was found not affected by the percent add-on. However, above 4 wt% PAN treatment, the flame retardancy performance became deteriorated.

UHMWPE fibers were dyed with yellow and red dyes having different length of alkyl substituents on monoazo chromophores. The dyeability was investigated at various conditions and fastness of the dyeings was examined. As the length of alkyl substituents increased, the dyeability toward UHMWPE fibers tends to be improved gradually up to propyl or butyl groups and then decreased for the longer alkyl substituents. Color strength of the fabrics was increased with the increase of dyeing temperature from 100 to 130 °C. From the dyeing rate, equilibrium dyeing at 130 °C was achieved at 2∼3 h. The color fastnesses to washing, rubbing, and light of the dyeings were good showing higher than 4 ratings except for light fastness of the red dye.

UHMWPE fibers were dyed with a series of anthrquinoid blue dyes having different length of alkyl substituents at general dyeing condition. The dyeability was investigated at various conditions and fastness of the dyeings was examined. As the length of alkyl substituents increased, the dyeability toward UHMWPE fibers tends to be improved gradually. Color strength of the fabrics was increased with the increase of dyeing temperature from 100 to 130 °C. From the dyeing rate, equilibrium dyeing at 130°C was achieved at 2–3 h. The tensile strength of UHMWPE fibers after dyeing at 130 °C for 1 h was maintained at a level of 95 % of untreated fiber. However, at prolonged dyeing time at 130 °C, the tensile strength was significantly decreased to a practically unacceptable level. The color fastnesses to washing, rubbing and light of the dyeings were very good showing higher than 4 ratings.

The dyeing and color fastness properties of two reactive-disperse dyes containing a sulfatoethylsulfone group on nylon, PET and N/P mixture fabrics were examined. The rate of dyeing on nylon fabric was greatly dependent upon dye bath pH. The final dye uptakes at all pH, however, were as high as 97 %. Color strength of the dyed nylon fabric linearly increased up to 0.5 %owf and then slowed down over 1 %owf dyeing. Washing and rubbing fastness of the dyed nylon fabric were excellent, but grade of light fastness was moderate. Dyeability of the reactive-disperse dyes on PET fabric was not much affected by pH, and K/S values of PET fabric dyed at pH 5–8 were lower than those of nylon fabric at all pH examined. Buildup and color fastnesses properties on PET fabric showed the same tendency with nylon fabric. The rate of dyeing of the reactive-disperse dyes on nylon fabric was faster than on PET fabric when both fabrics were dyed simultaneously in the same dye pot, resulting in higher color strength of nylon than PET. The reactive-disperse dyes were found to be adequate to the one-bath, one-step dyeing of N/P mixture fabric when applied at pH 5 and 120 °C.

Wool/cotton union fabric was dyed with a direct dye in union shade. The dyeing was performed in a single bath in relation to four factors: leveling agent (Lyogen SMKI, 0–1.5 % oww), electrolyte (sodium sulfate, 0–10 %), dyeing temperature (85–95 °C), and dyeing time (15–60 min). The dyeing was characterized by dye bath exhaustion (%), color strength (K/S value), washing fastness, and light fastness of dyed sample. Response surface analysis showed that the exhaustion of direct dye increased with electrolyte, dyeing temperature, and dyeing time while the K/S value followed a linear shape with leveling agent and dyeing temperature. An optimized recipe was formulated based on response surface strategy and numerical optimization solution.

Wool fabrics were pretreated with calcium and sodium oxalate in acidic and alkaline pH media. The pretreated and untreated fabric samples were then dyed in the same bath with acid dyes by the exhaustion technique. The pretreated fiber sample surfaces were observed using a scanning electron microscope. The color strength and fastness properties of the fabrics were investigated. The results of the study showed that pretreatment with oxalate derivatives can be used as a means of improving the dyeability of wool fibers. As the dyed, pretreated wool fabrics had higher color strength and fastness results than the untreated wool fabrics, the mechanical properties were affected negatively. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 3440-3445, 2011, Wool fabrics were pretreated with calcium and sodium oxalate in acidic and alkaline pHmediums. The pretreated and untreated fabric samples were then dyed in the same bath withacid dyes by the exhaustion technique. The pretreated fiber samples, surfaces were observedusing a scanning electron microscope (SEM). The color strength and fastness properties of thefabrics were investigated. The results of the study showed that pretreatment with oxalatederivatives can be used as a means of improving the dyeability of wool fibers. The dyedpretreated wool fabrics had higher color strength and fastness results than the untreated woolfabrics.

Cotton samples were pre-treated with various sol solutions containing different alkoxysilanes (TEOS, GPTMS, APTES, and TESP-SA). The as-prepared cotton samples were dyed with 2 % owf Red and 4 % owf Blue. Furthermore, dyed cotton samples were after-treated with the alkoxysilanes. The alkoxysilane were also incorporated into the dyeing bath. The as- prepared cotton samples were subjected to a treatment with the non-formaldehyde durable press finishing agent BTCA in conjunction with the catalyst SHP. The textile materials were evaluated with respect to the colorimetric data (L*, a*, b*, ΔE*) and the color strength expressed in terms of K/S values. Tensile strength and dry crease recovery angles of the durable pressfinished samples were measured. The findings indicate that APTES and TESP-SA exert a significant influence on the color properties.

Sirospun yarn production is a new approach to produce two‐folded and twisted yarns. This method integrates the spinning and folding action in a single step. Therefore, it may have some important advantages such as simplicity of the process, lower production costs, lower investment, space saving, etc. The purpose of the study is to compare the color fastness and colorimetric properties of sirospun yarn, single and two‐folded ring spun yarns produced by same cotton fiber blend. Therefore, three reactive dyes were applied at 1% omf (on mass of fabric) depth of shade to the single jersey fabrics which are produced by sirospun yarn, single and two‐folded ring spun yarns at three different counts. The examination of color coordinates of undyed and dyed samples on CIELAB color space shows that undyed sirospun fabrics show slightly higher whiteness than both undyed single and two‐folded ring fabrics for all three yarn counts. Also, the color strength values of the samples are determined as slightly different for ...

The effects of low and moderate levels of degree of substitution (LDS ∼0.2 and MDS ∼0.6) on physicochemical and textile printing properties of carboxymethyl rice starches (CMRS) containing different amylose (AM) content were investigated. With a similar level of AM, MDS CMRS displayed higher cold water solubility (CWS), yield stresses, and apparent viscosities than those of LDS CMRS. Furthermore, they were superior to LDS CMRS when used as textile print paste. AM also influenced the properties of CMRS with similar DS. When AM increased, CWS of LDS CMRS increased. However, yield stresses and apparent viscosities of CMRS decreased with increased AM. MDS waxy CMRS print paste provided the least color strength among other MDS CMRS. Nonetheless, DS was shown to have a far greater effect than AM on determination of CMRS properties.

This paper focuses on the assessment of color strength and chroma values that occur in dyed polyester fabrics after different cycles of abrasion for different fabric construction parameters. We used 12 polyester fabrics with various construction parameters in two experimental sets. The fabrics differed from each other by their cover factors. The warp yarn type and count, warp density, warp yarn twist and the fabric weave were the same for all of the fabrics in each experimental set. The dyeing of the fabric samples was performed by using a commercial disperse dye (CI Disperse Red 74:1). Four different abrasion cycles (2500, 5000, 7500, 10,000) were used. The main differences in color strength and chroma values were observed between 0 and 2500 cycles of abrasion. Increasing abrasion cycles after 2500 changed the appearance of the fabrics woven from staple weft yarns considerably. It is concluded that the rubbing motion of the Martindale instrument is related to the cover factor of the fabrics and dyeing concentration applied. The main effect of abrasion on color strength and chroma values was obtained up to 2500 cycles.

The purpose of this study is to find the optimum combination of processing parameters for achieving the target required. Taguchi method has been proposed in the research. The orthogonal array is used to determine the optimum conditions and significant factors together with the analysis of variance (ANOVA). In the experiment, the color strength (K/S) of fabrics was chosen to be the target characteristic, and the confirmation experiments were performed to verify the reproducibility of the experimentation. After three confirmation experiments, the signal-to-noise ratios (SN ratios) fall within 95% confidence interval. In addition, the K/S values of dyed fabrics in optimum condition are much closer to the target values. In conclusion, the significant factors influencing the dyeing results were used to construct the prediction system of back-propagation neural network combined with Taguchi method for achieving the accurate prediction ability. The results indicate that the percentage errors are all within 3.5.

Dyeing and color fastness properties of a reactive disperse dye containing an acetoxyethylsulphone group on PET, Nylon, silk and N/P fabrics were examined. The reactive disperse dye exhibited almost the same dyeing properties on PET fabric as a conventional disperse dye except the level of dye uptake. The most appropriate pH and dyeing temperature for the dyeing of Nylon fabric were 7 and 100°C respectively. The build-up on Nylon fabric was good and various color fastnesses were good to excellent due to the formation of the covalent bond. Application of the reactive disperse dye on silk fabric at pH 9 and 80°C yielded optimum color strength. The rate of dyeing on Nylon fabric was faster than that on PET fabric when both fabrics were dyed simultaneously in a dye bath, accordingly color strength of the dyed Nylon was higher. The reactive disperse dye can be applied for one-step and one-bath dyeing of N/P mixture fabric with good color fastness.

This paper investigates improved direct dye printing of cotton by cationization. For the cationization, a 100% cotton woven fabric is pretreated with 2,3-epoxypropyltrimethyl ammonium chloride by a cold pad-batch method. All printing conditions are constant, and four different direct dyes are used to print both unmodified and cationized cotton fabrics. The effects of cationic reagent concentration, steaming time, dye concentration, color yields, colorimetric properties, fastness properties, staining of the white ground, and penetration behavior are evaluated. This research reveals that printing with direct dyes on cationic cotton is a very simple, cost effective printing method with high wet fastness properties.

Flax fabrics were dyed with natural colorants extracted from animal and plant sources. The colorants used were cochineal, red sandalwood, madder root, and osage orange. The influence of the order of mordanting on color strength of dyed fabrics was analyzed. Colorfastness tests for washing, crocking, and perspiration were performed. Results obtained were correlated with color strength analysis. Scientific analysis and interpretation of natural dyeing processes is essential to demonstrate the economic feasibility of dyeing flax and other natural fibers with environmentally benign natural colorants.