Effect of Geometrical Parameters of the Yarn Channel in an Intermingling Jet on Nip Structure and Stability of Textured Yarn
Siavash
Afrashteh
Department of Textile Engineering, Qaemshaher Branch, Islamic Azad University, Qaemshahr, Iran
author
Safdar
Eskandarnejad
Department of Textile Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
author
text
article
2013
per
Intermingling of wound yarns is an important method of producing cohesiveness between the individual filament yarns. Many researchers have studied the effects of various parameters on yarn production. This paper attempts to investigate the effect of length and cross-sectional area of the yarn channel on yarn properties. A total of nine jets with yarn channel lengths of 20, 30 and 40 mm, and square cross section of 1.5, 2.25 and 3.0 mm were tested. The tests were carried out on the yarns to examine nip stability and microscopic observation of the nip points. It was concluded that, a short and narrow yarn channel may produce a short nip length with maximum nip density and stability. While, a long and wide yarn channel produces a long nip length with lowest nip density and stability. The width of the yarn channel had an effect on loose nips, while in the longest channel (40 mm), there was no difference on loose nips. The last class was two or more parallel structures, which decreased as the width of the yarn channel decreased. Loose nips varied in different channel lengths, though it did not show a specific trend.
Journal of Textile Science and Technology
Today Textile Institute
2151-7162
2
v.
4
no.
2013
195
200
https://www.jtst.ir/article_2842_d36fa868a36d9c0c7bbc3d7d1ed7e191.pdf
Starch Fibers Production by Wet Spinning in Rotational Coagulation Bath
Seyedeh Samaneh
Sarbaha
Department of Textile Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
author
Ramin
Khajavi
Department of Textile Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
author
Amir Hosein
Berendjchi
Department of Textile Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
author
Sepehr
Pourariyan
Department of Textile Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
author
text
article
2013
per
Due to polymer chains spatial and complexities arising in spinning dope preparations there has not been much effort made on production of starch fibers. In this study, a new procedure based on wet spinning is introduced for dope spinning in a rotational coagulation bath by choosing a suitable solvent. Wheat starch solubility was tested in different solvents including water, water/alkaline, water/DMSO and DMSO. Then, suitable spinning dopes were injected into a rotating coagulation bath containing water/alcohol and ready staple fibers were collected by filtration. As-spun fibers were evaluated by scanning electron microscope, Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) and tensile mechanical tests. The results showed that among all solvents, DMSO was the most suitable solvent. Staple fibers of fine (3-5 μm) and amorphous morphology were obtained by using wet spinning method in a rotational coagulation bath, which have potential application in paper and medical industries considering thelengths and small diameters of the fibers obtained.
Journal of Textile Science and Technology
Today Textile Institute
2151-7162
2
v.
4
no.
2013
201
207
https://www.jtst.ir/article_2843_ff02fffab5723935c6ca06a26af547a8.pdf
Extracting and Clustering Stone-Wash Design in Jeans Images Using K-means Algorithm
Zeinab
Mazdak
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
Pedram
Payvandy
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
ALi Asghar
Alamdar Yazdi
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
text
article
2013
per
Jeans have increasingly become popular among young people worldwide, just the same as in global markets, and therefore their quality needs to be controlled carefully. This paper deals with the classification of the stone-wash jeans by using k-means clustering algorithm. A total of 306 ready jeans were prepared and the stoned zones of their front and back were imaged under light projection. The K-means clustering algorithm was used to extract jean stone-wash designs. Finally clustering schemes were applied by K-means clustering in order to achieve the optimized condition by running the program one hundred times on the front and the back of the trousers. The clustering validity method was based on Davies-Bouldin Index as the best method. Finally, the result of the above method was compared with the optical method. The results showed that k-means clustering method, applied on stone-wash design, was comparable with the unaided eye observation by 60%.
Journal of Textile Science and Technology
Today Textile Institute
2151-7162
2
v.
4
no.
2013
209
215
https://www.jtst.ir/article_2844_7cd7c997f71018f5f9b56df2a159e5e4.pdf
Microwave and UV-Assisted Surface Modification of Polypropylene Fibers
Elham Sadat
Jamadi
Textile Engineering Department, Isfahan University of Technology, Isfahan, Iran
author
Akbar
Khoddami
Textile Engineering Department, Isfahan University of Technology, Isfahan, Iran
author
Zahra
Sadrearhami
Textile Engineering Department, Isfahan University of Technology, Isfahan, Iran
author
text
article
2013
per
Polypropylene due to its non-polar nature has some limitations in certain special applications which are vulnerable by the surface properties of the fibers. Nowadays, research on surface modification of polypropylene (PP) textile fibers has also focused on improvement of their main drawbacks such as low moisture absorption and anti-static properties. This paper deals with novel low water using methods to modify the surface of polypropylene fibers by “ultraviolet radiation-hydrogen peroxide” and “microwave radiation”. Therefore, the samples were treated in different conditions and the surface properties were studied by measurement of moisture absorption, anti-static properties, tensile tests and FTIR-ATR spectroscopy. The results showed an increase in moisture absorption combined with improvement in anti-static properties, while the applied methods did not show any significant adverse effects on the tensile strength of the fibers. In addition, the analysis of the ATR spectra revealed some chemical changes and formation of functional groups such as carbonyl and vinyl groups on the surface of modified fibers. Overall, the results showed that the above methods can be applied for surface modification of PP fibers with considerable time and energy savings and low oxidant concentration which are textile industries priorities to minimize environmental pollution.
Journal of Textile Science and Technology
Today Textile Institute
2151-7162
2
v.
4
no.
2013
217
222
https://www.jtst.ir/article_2847_52228af175d36c8c92306e9aca9685c6.pdf
Monitoring the Most Critical Error-based Failures in Carpet Production by Failure - Mode - and - Effects Analysis
Mohammad
Hatamvand
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
Seyyed Abbas
Mirjalili
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
Mohsen
Hadizadeh
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
text
article
2013
per
There is always a probability of recurring failures in a manufacturing system. These failures disturb the output of a system quantitatively and qualitatively, and on the whole they are menace to the system's productivity. This paper introduces a technique called "failure-mode-and-effects analysis (FMEA)" to recognize or monitor and reduce harmful effects of the most critical errors in a carpet manufacturing system. This method requires a team of inspecting members to discuss the type of failures and their potential risk by classifying each failure under a grade called "risk priority number (RPN)". The failures with highest RPN are the most critical type of failures for which corrective actions must be preferentially taken to increase the quality of the production. In this research work, FMEA technique is adopted in a carpet manufacturing system to evaluate and monitor the type and quality of the failures, while presenting solutions to eliminate them most effectively.
Journal of Textile Science and Technology
Today Textile Institute
2151-7162
2
v.
4
no.
2013
223
227
https://www.jtst.ir/article_2845_5df7839a211ba7e736dbb8269c68f8e0.pdf
Spinnability and Tensile Properties of Poly(ethylene terephthalate) Fibers Blended with Polymeric Ionic Liquids in Melt Spinning Process
Nasrin
Haghighat
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
Mohammad Ali
Tavanaie
Department of Textile Engineering, Faculty of Engineering, Yazd University, Yazd, Iran
author
Mahdi
Safi
Department of Color Physics, Institute for Color Science and Technology, Tehran, Iran
author
Farhood
Najafi
Department of Inorganic Pigments and Glaze; Institute for Color Science and Technology, Tehran, Iran
author
text
article
2013
per
Ionic liquids (ILs) with unique properties such as low melting point, high thermal stability, electrical conductivity, good solubility etc. are widely used as the environment-friendly solvents. Studies show that the use of ionic liquids is a new effort in textile industry and basic research, as these are applied as green solvents in solution spinning of the viscous fibers in industrial scale. In this study, blending of some polymeric ionic liquids (PIL) with poly(ethylene terephthalate) (PET) was examined by melt spinning process to produce PET/PIL fibers. Also the mechanical properties of the melt spun fibers were evaluated. The results showed that addition of polymeric ionic liquids to PET during the melt spinning process would cause complications due to high moisture absorption and hydrolysis of PILs. The melt viscosity of PET/PILs in melt process dropped significantly. The viscosity reduction of the blends was prevented using a polymeric chain extender. Also the cationic laurylurethane trimethylene was considered an appropriate polymeric ionic liquid which showed the lowest adverse effect on the mechanical properties of PET/PILs fibers in an optimized composition.
Journal of Textile Science and Technology
Today Textile Institute
2151-7162
2
v.
4
no.
2013
229
235
https://www.jtst.ir/article_2846_81d878c1c9c65feb315c8de0293dccd8.pdf