Showing 14 results for Wool
Dr Majid Montazer, Mr Saied Ahankoob,
Volume 1, Issue 1 (3-2006)
Abstract
Ammonia is a weak base that can be used as an swelling agent on wool fibres before dyeing. In this study the pretreatment of wool with ammonia in different percent solutions (5, 10, 15, 20) is carried out, and its effect on dye-ability of wool by natural dyes such as madder, walnut shell, pomegranate peel, vine leaf, white and red onion skin, is analyzed. Also the effects of temperature, length of time, and concentration of ammonia on dye-ability of wool fibres were considered. Colorimetric data, and measurements of light and washing fastness were carried out, and the results of color change under ammonia treatment are reported.
Dr. Ahmad Akbari,
Volume 2, Issue 2 (6-2006)
Abstract
New nanofiltration membranes were produced in the form of unfilled fibers through the photopolymerization method. Parastyrene sodium sulfonate was used as the vinyl monomer to reform the polysulphone ultra-filtration membranes. The modified membranes were used to purify colored solutions of three different pigments consisting acidic, reactive and direct (suitable for dyeing pile yarns and warps), in order to refine and reuse the pigment solutions. The effect of various parameters like pressure, electrolyte, time, and the kind of pigment on the extent to which the pigment is confined and the flux of the membrane outflow was assessed. Results showed that besides the effective function of bleaching, the problem of barred pores observed in most commercial membranes built of polyamide also reduced significantly in the new membranes.
Dr. Majid Montazer, Mr Saeid Zarineh,
Volume 2, Issue 3 (9-2006)
Abstract
The influence of urea as an additive in dyeing of wool with madder was evaluated in this work. A different concentration of urea was applied on wool yarns before, during and after dyeing of samples. The treated samples were tested for dye absorption at different time, wicking, sinking, wash and light fastness and surface morphology by scanning electronic microscope. The results show that urea is an effective additive in dyeing of wool by madder by increasing the dye absorption. Adding of urea ranging 50% to 250% on weight of fibers leads to swell the wool fibers however, increasing the urea percent to 300% may damage the fiber surfaces and reduces the fiber strength.
Dr Fatemeh Dadashian, Dr Majid Montazer, Mr Shahram Rahimi, Mr Ghasem Bazyar,
Volume 3, Issue 6 (9-2007)
Abstract
Special properties of Iranian wool such as elasticity compared with Merino wool leads to more popularity of Persian carpet at an international level. By using of finishing process it is possible to improve some of the physical properties of wool fibers such as fleece modification, increasing of lightness and whiteness and producing a smoother surface that result a better quality carpet. In this research influence of proteases on Iranian wool was investigated and variation in concentration and time was optimized. The results indicated that increasing of enzyme leads to increasing of loss of weight, strength and strain. With prolonged enzymatic processing it may obtain better whiteness, lightness, and bending. Changes in whiteness, bending and fineness and other properties such as weight loss, strength reduction and strain would be discussed.
Dr Majid Montazer, Mr Hamid Rahimpour,
Volume 4, Issue 9 (6-2008)
Abstract
UV irradiation was known as an important factor for skin cancer and also textile fibers and dyes degradation. UV rays have high energy photons degrading dyes and fibers causing fading and rotting of textiles when they are exposed to sunlight. The sun blocking properties of a textile are enhanced when a dye, pigment, delustrant, or UV absorber is present which absorbs UV radiation and releases heat. They block the transmission of UV and inhibit the dye and fiber exposure. In this study, natural dye of madder with different mordants and two organic acids including: tannic acid and citric acid were selected for dyeing wool. Impacts of tanninc acid and madder on UV transmission were investigated. Also the effects of madder on protecting fabrics against UV were determined by measuring their tensile strength. The results indicate that tannic acid has positive influences on blocking UV and even increasing the tensile strength. The results also reveal that silver nitrate and copper sulphate are the best UV blocking among others. Finally, the wool fabric sample treated with silver nitrate and dyed with madder along with tannic acid exhibits the highest protection against UV.
Mr Ali Jahangir, Mr Abdolreza Zahiri, Mr Mehdi Akhbari,
Volume 6, Issue 15 (6-2010)
Abstract
Commercial wool scouring instructions are introduced mainly by technological and chemical manufacturing companies. Most of the instructions are prepared according to the technical specifications of the most famous international wool brands with high level of production. Other types of wools are scoured based on mentioned instructions with minor corrections. Using commercial instructions in scouring of Iranian wools usually leads to decrease the scoured wool quality. In this study, operational methods and machine settings used by Iranian wool scouring companies are investigated. To achieve better appearance characteristics (light and optical) on scoured wool, some changes to conventional methods are introduced, considering the Iranian wool characteristics. These changes are then evaluated to suggest the optimum methods of scouring. Finally, effects of these changes are evaluated to suggest the best method for obtaining the best quality Iranian scoured wools. Results show that the changes have advantageous effects on the quality of scoured wools.
Mr Mohesen Hosseinkhani, Dr Majid Montazer, Mr Safdar Eskandarnejad, Mr Mohammad Karim Rahimi,
Volume 7, Issue 18 (6-2011)
Abstract
tensile strength. Moreover, making wool fabrics antibacterial is a considerable task for protection of fabrics and consumers against microbial attack and growth. In this research nano-silver was synthesized using reduction of silver nitrate by sodium bisulfite along with increasing the fiber fineness using tensile. This process was successfully introduced Iranian coarse wool yarns with loading of nano-silver through in situ synthesis and consequently, suitable antibacterial properties along with some other improved properties such as yarn tenacity and improvement of yarn count were obtained. Subsequently, SEM and EDX analyses confirmed the nano-silver synthesis on the wool yarns and indicated the importance of test conditions on antibacterial properties of the fibers.
Mr Mohammad Reza Shahparvari, Dr Seyed Jalal-Eddin Bassam,
Volume 7, Issue 19 (9-2011)
Abstract
Every year, during rose water extraction a huge amount of damask rose residue is produced. The transportation and disposal of these waste materials create some problems including an increase in the price of the produced rose water. In this study the use of damask rose residues in dyeing wool is assessed and a method for its use as a colorant in natural dyeing is offered. Dyeing was carried out by using the material along with some mordants such as alum, copper sulphate, iron sulphate, chlorine and tin and also without mordant by adopting pre-mordanting technique. Various amounts of mordants and colorants were used. Comparing the obtained color hue with those from other traditional colorants, it was observed that the color hue obtained from damask rose residues was greatly similar to the color hue gained from pomegranate peel. These two color hues were analyzed and compared using the carpet weavers’ views as well as measuring wash and light fastness properties using experimental methods. The results indicate that damask residues can be used as a new natural colorant particularly in carpet production. This can provide a new colorant with minimum expenses, reduce the price of rose water extraction, and prevent environmental pollution.
Dr Farideh Talebpour, Mr Mohammad Veysian,
Volume 10, Issue 25 (9-2014)
Abstract
This research work involves the dyeing of wool yarns with saffron petals as a source for green color. At first step woolen pile yarns treated with four different mordents, namely: tin chloride, copper sulfate, aluminum sulfate and iron(II) sulfate in acidic condition using acetic, oxalic, citric and lactic acids respectively. In this study the possibility of using saffron petals as a natural dye for wool yarn was investigated. By using different mordents a range of hues from green to yellow and brown was obtained. Color parameters, washing fastness, rubbing fastness (wet & dry) and light fastnesses of the dyed yarns were measured. It can be concluded that the best mordents for dyeing wool yarn with saffron petal to obtain green color are tin chloride and aluminum sulfate. The results of fastness tests of samples treated with tin chloride are poorer so that the best suggested mordent for dyeing wool with saffron to get green color is aluminum sulfate.
Mrs Robabeh Taghizadeh Borujeni, Dr Ahmad Akbari, Mr Abdolsalim Gharehbaii,
Volume 11, Issue 28 (3-2016)
Abstract
Today, much research is conducted on the use of new methods of dyeing textiles, all of which are trying to select an appropriate method of reducing the usage of energy and chemicals in a way to produce cost-effective products with an acceptable uniformity. One of these methods is the use of ultrasonic waves. Since the dyestuff is extremely limited by the plant cell membrane, extraction methods such as ultrasonic ones can better improve the mechanism of extracting natural dyes and dyestuff out of cell membranes and also improve the transfer of dyestuff onto fibers’ dyeing process in order to assist in conservation of natural resources,
The aim of this study is to use ultrasonic waves in the extraction of dyestuff of walnut shell and to dye wool fibers with the extract. Favorable results are obtained compared to conventional screw. By calculating the absorption efficiency with conventional ultrasound method, it was concluded that the use of ultrasonic waves can increase the concentration of the dye in solution more than the conventional method and by increasing the concentration of the dye in both methods, this factor is increased. According to the findings, it is concluded that ultrasonic extraction method is more efficient than the usual one. To investigate the effects of ultrasonic method in the dyeing process, the productivity of ultrasonic method in dyeing was calculated in relation to conventional method in two modes of (UU) and (UC). The productivity of (UU) in relation to (UC) was % 13/77. Various mechanical aspects are included to achieve the positive effect of the use of ultrasonic waves in dyeing process such as degassing of fiber, stimulation of dyeing solution, rapid spread of dyestuff on fiber and breaking the gathering of dyeing molecules. These cause a higher influence of the dyestuff in the fibers and a sheer deep dye. Measurement of stabled samples results show that the stability of the samples in both ultrasonic and conventional methods, has been fair to good. The results of the SEM analysis clearly presents this conclusion. Creating a kind of surface erosion and degradation scales, which led to greater influence and power of color dye into the fiber, increases the effects of cavitation. They are considered to be seen in the SEM images.
Mr Mohammad Reza Shahparvari, Dr Siyamak Safapour, Dr Kamaladin Gharanjig,
Volume 13, Issue 32 (3-2018)
Abstract
To increase the color range of textile. Dyeing is to be done with more than one color-shedding substances, However before the conduction of Dyeing with the form of combining color-substances, the capability and probability of the combination, that is to be tested with the scale of degree in compatibility, has to be considered.
Bearing in mind the necessity of producing a high range of color in hand-woven carpet and importance of compatibility in dyeing materials, this research is looking for the extent of compatibility in color, substances including: Madder, weld, Prangos ferulacea and walnut shell on woolen thread, Raw and mordanted with aluminum sulfate as one of the means of estimating compatibility
The result has shown that the dyeing capability in woolen thread with walnut shell in comparison with three other color shedding substances is variable. thus the similarity in extent of compatibility in three color- shedding substances: Madder substances: madder weld and Prangos ferulacea shows the high compatibility they have in common.
However differences in the diagram of dyeing of walnut shell shows little compatibility of these substances in getting combined with madder, weld and Prangos ferulacea.
After the calculating the capacity of dyeing in each of coloring substances woolen thread (on the basis of even combination of four dyeing substances with three different ratio) was dyed. The result shows that dyeing compatibility in Madder, weld and Prangos ferulacea in combination with each other is good to excellent in diagram. While combination of walnut shell with three other color substances caused very low compatibility. In addition to that, results show the effect of density and using dents in coloring.
On the whole result of this research have shown that dyeing substances madder weld and Prangos ferulacea have high compatibility with each other and have combination compatibility in the same range while possibility of combining three substances with walnut shell, duo to low compatibility is very low. The way of conducting this research is pragmatic and gathering of all the information is laboratory and library-based.
Alumnus Behnaz Barjesteh, Dr. Ali Nazari, Dr. Mehdi Dehghani-Zahedani,
Volume 14, Issue 33 (9-2018)
Abstract
Worthful wool products have excellent properties such as high strength, resiliency, dyeability, air imprisonment and it is comfortable that can be used easily. But this fiber has a limitation of nutrition and destruction via wool products digesting species such as Tineola bisselliella. This research evaluates silver nanoparticles efficiency accompany with citric acid stabilizing agent in protecting wool carpets against Tineola bisselliella via validity bioassay and quantifying nutrition amount of treated samples. Therefore, central composite design (CCD) statistical method was used to design experiments and response surface methodology (RSM) was applied to analyze obtained results through Design Expert statistical software. Based on this, wool carpets were exposed to Tineola bisselliella larvae with various concentrations of silver nanoparticles during different days and weight reduction amounts were quantitatively accounted, as minimum optimized, and qualitatively observed as compared with control sample. Then, using statistical analysis, optimized models were presented based on weight reduction dependent variable than independent variables such as silver nanoparticles concentration amounts and exposure days. Also, alkaline solubility was evaluated as other significant characteristic of wool carpets. Images of nutrition status in treated and control wool carpets were illustrated using light microscopy equipped with digital camera and scanning electronic microscopy. Beside, elemental analysis of optimized wool carpets was discussed through energy-dispersive spectroscopy in order to confirm silver presence. Results of this study exhibit that in optimized condition including 3.07 % silver nanoparticles, 10.0 % citric acid friendly-environment cross-linking agent, and 30 days exposure of wool carpets to Tineola bisselliella, the minimum of response variables including 0.09 % weight reduction and 3.13 % alkaline solubility, in other words, significantly highest protection of wool carpets was obtained against Tineola bisselliella.
Ms Akhtar-Alsadat Mousavi, Ahmad Akbari, Hassan Khatami,
Volume 14, Issue 34 (3-2019)
Abstract
One of the problems of natural yellow dyes (weld) is their low stability against light and their high fading rate. One of the main destructive factors in pale of color fibers and hand-woven carpet is the high-energy ultraviolet radiation which causes chemical bonds to break and optically damages of organic structures. In this study, the effect of some antioxidants (gallic acid, ascorbic acid) and conventional UV absorbents, (2- hydroxy benzophenone as a supplement agent is studied in order to improve light fastness property. The effect of light fastness variables such as exposure time, antioxidants concentration, relative humidity were optimized. Afterward, the obtained changes were compared with the original sample and were stated in terms of ΔE color change value. The results showed that in all cases, the use of UV absorbents or antioxidants relatively improves light stability properties of the samples. The best result in increasing light stability was observed in using gallic acid.
Saeedeh Rafiei, Davood Shadlou,
Volume 17, Issue 40 (9-2021)
Abstract
In the last decade, biocompatible natural dyes with antimicrobial properties have been given much attention to protect dyed fibers in handwoven carpets against microorganisms. In this research, the leaves of 6 native plants of Fars province, including Amygdalus scoparia (Arjan), Pistacia atlantica (Baneh), Carica Ficus, Shirazi thyme, Shirazi Askari grape (Vinifera) and Juglans, were used as natural dyes for wool dyeing in the presence of eight different metal mordants. The reflective spectra of the dyed samples were analyzed by a reflective spectrophotometer. In addition, the color characteristics, the brightness of the dyed samples, the variety of color shades in the presence of different mordents, washing and light fastness as well as the antibacterial properties of the dyed wool were evaluated. The results of reflection spectroscopy showed that dyed samples with the leaves of Argan, grape, thyme and fig plants had negative a* and positive b* values, which confirms their green and yellow undertones, While, dyed samples with the leaves of baneh and Juglans trees had positive a* and b* values, which proves the red and yellow undertones of these samples. Wool fibers dyed with Argan leaves, figs and thyme in the presence of different metal teeth created the most variety of colors. Ivory, cream, green, brown, olive, orange, brick and purple colors were created on wool fibers in the presence of the leaves of these plants along with different mordents. The light and washing fastness of dyed samples with all the mentioned dyes were acceptable. Wool dyed with thyme and Pistacia atlantica leaves extract showed the maximum percentage of inhibition (99%) against two types of bacteria, Escherichia coli and Staphylococcus aureus.
