[Pinned] Hi tech textile is more and more popular!
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2011/01/05 09:12 | by admin ]
2011/01/05 09:12 | by admin ]
1.hi tech textile Introduction
Friction (DREF) spinning system is an Open-end and or Core sheath type of spinning system. Along with the frictional forces in the spinning zone the yarn formation takes place. The DREF spinning system is used to produce yarns with high delivery rate(about 300mpm). Still it has to gain its importance with the growth along with hi tech textile technical textiles in India. Amongst the spinning systems, DREF provides a good platform for production of core spun yarns due its spinning principle.It offers less spinning tension to the core and core will be positioned exactly at the centre of the yarn.
Development of DREF core-spun yarns unveils a path for new products including high performance textiles, sewing threads and in the apparels due to its exceptional strength, outstanding abrasion resistance, consistence performance in sewing operation, adequate elasticity for the stretch requirements, excellent resistance to perspiration, ideal wash and wear performance and permanent press. hi tech textile
2.0 Principle of Friction (DREF) spinning hi tech textile Systems
The friction spinning system consists of opening & individualization of fibres from slivers, reassembling of individualized fibres, twisting and winding of yarn. The figure 1 describes the DREF spinning principle where the opened fibres made roll with an aid of a mechanical roller for reassembling and twisting. Due to separate yarn winding and method of twist insertion, it has hi tech textile capability to go for high production rate.
2.1. DREF-1
DREF-1 friction spinning system was developed in 1973 by Dr.Fehrer.A.G. of Austria.The schematic diagram of DREF 1 spinner is shown in the figure 2.The fibres were opened with an opening roller and allowed to fall on a single perforated cylindrical drum slot ,which has negative pressure for fibre collection.The hi tech textile rotation of the drum impart twist to fibre assembly [1].
The ratio of perforated drum to yarn surface is very large, hence the drum speed can be kept relatively low, even if one takes the unavoidable slippage into account [2]. Due to the absence of positive control over the fibres assembly, slippage occurred between the fibre assembly and perforated roller, which reduced twist efficiency of hi tech textile . Hence this development could not be commercialized.
2.2. DREF-2
This is the development with earlier machine. DREF-2 was exhibited in the year 1975 at ITMA exhibition. The feasibility of using two perforated rotating cylinders, (as fibre collecting means), while at the same time the spinning-in of fibres into yarn occurred [3]. It operates on the basis of mechanical/aerodynamic spinning system with an internal suction and same direction of drums rotation [4]. The schematic diagram of the DREF-2 friction spinner is shown in the figure3. Drafted slivers are opened into individual fibres by a rotating carding drum covered with saw tooth type wire clothing. The individualized fibres are stripped off from the carding drum by centrifugal force supported by an air stream from the blower and transported into the nip of two perforated friction drums where they are held by suction. The fibres are sub-sequentially twisted by mechanical friction on the surface of the drums. Suction through the perforations of the drums assists this process besides helping in the removal of dust and dirt, thereby contributing to production of cleaner yarn [5]. The hi tech textile low yarn strength and the requirement of more number of fibres in yarn cross-section(minimum 80-100 fibres) were restricted the DREF-2 spinning with coarser counts (0.3-6s Ne).
2.3. DREF-3
The DREF-3 machine is the next version of DREF 2 for improving the yarn quality came to the market in the year 1981.Yarns up to 18s Ne. can be spun thro this hi tech textile system.
This is a core-sheath type spinning arrangement. The sheath fibres are attached to the core fibres by the false twist generated by the rotating action of drums. Two drafting units are used in this system, one for the core fibres and other for the sheath fibres. This system produces a variety of core-sheath type structures and multi-component yarns, through selective combination and placement of different materials in core and sheath. Delivery rate is about 300 m/min. DREF 3 schematic diagram is shown in the hi tech textile figure 4.
2.4. DREF-5
It was developed by Schalafhorst, Suessen and Fehrer Inc. The range of count to be spun from this system is from 16�s to 40�s Ne.Production speed is up to 200m/min.The schematic diagram of the DREF 5 is shown in the figure 5. The individualized fibres from a single sliver are fed through a fibre duct into the spinning nip at an angle to the yarn axis, so that they are stretched as far as possible, when fed into the nip[7]. This hi tech textile spinning system was not commercialized due to some reasons.
Friction (DREF) spinning system is an Open-end and or Core sheath type of spinning system. Along with the frictional forces in the spinning zone the yarn formation takes place. The DREF spinning system is used to produce yarns with high delivery rate(about 300mpm). Still it has to gain its importance with the growth along with hi tech textile technical textiles in India. Amongst the spinning systems, DREF provides a good platform for production of core spun yarns due its spinning principle.It offers less spinning tension to the core and core will be positioned exactly at the centre of the yarn.
Development of DREF core-spun yarns unveils a path for new products including high performance textiles, sewing threads and in the apparels due to its exceptional strength, outstanding abrasion resistance, consistence performance in sewing operation, adequate elasticity for the stretch requirements, excellent resistance to perspiration, ideal wash and wear performance and permanent press. hi tech textile
2.0 Principle of Friction (DREF) spinning hi tech textile Systems
The friction spinning system consists of opening & individualization of fibres from slivers, reassembling of individualized fibres, twisting and winding of yarn. The figure 1 describes the DREF spinning principle where the opened fibres made roll with an aid of a mechanical roller for reassembling and twisting. Due to separate yarn winding and method of twist insertion, it has hi tech textile capability to go for high production rate.
2.1. DREF-1
DREF-1 friction spinning system was developed in 1973 by Dr.Fehrer.A.G. of Austria.The schematic diagram of DREF 1 spinner is shown in the figure 2.The fibres were opened with an opening roller and allowed to fall on a single perforated cylindrical drum slot ,which has negative pressure for fibre collection.The hi tech textile rotation of the drum impart twist to fibre assembly [1].
The ratio of perforated drum to yarn surface is very large, hence the drum speed can be kept relatively low, even if one takes the unavoidable slippage into account [2]. Due to the absence of positive control over the fibres assembly, slippage occurred between the fibre assembly and perforated roller, which reduced twist efficiency of hi tech textile . Hence this development could not be commercialized.
2.2. DREF-2
This is the development with earlier machine. DREF-2 was exhibited in the year 1975 at ITMA exhibition. The feasibility of using two perforated rotating cylinders, (as fibre collecting means), while at the same time the spinning-in of fibres into yarn occurred [3]. It operates on the basis of mechanical/aerodynamic spinning system with an internal suction and same direction of drums rotation [4]. The schematic diagram of the DREF-2 friction spinner is shown in the figure3. Drafted slivers are opened into individual fibres by a rotating carding drum covered with saw tooth type wire clothing. The individualized fibres are stripped off from the carding drum by centrifugal force supported by an air stream from the blower and transported into the nip of two perforated friction drums where they are held by suction. The fibres are sub-sequentially twisted by mechanical friction on the surface of the drums. Suction through the perforations of the drums assists this process besides helping in the removal of dust and dirt, thereby contributing to production of cleaner yarn [5]. The hi tech textile low yarn strength and the requirement of more number of fibres in yarn cross-section(minimum 80-100 fibres) were restricted the DREF-2 spinning with coarser counts (0.3-6s Ne).
2.3. DREF-3
The DREF-3 machine is the next version of DREF 2 for improving the yarn quality came to the market in the year 1981.Yarns up to 18s Ne. can be spun thro this hi tech textile system.
This is a core-sheath type spinning arrangement. The sheath fibres are attached to the core fibres by the false twist generated by the rotating action of drums. Two drafting units are used in this system, one for the core fibres and other for the sheath fibres. This system produces a variety of core-sheath type structures and multi-component yarns, through selective combination and placement of different materials in core and sheath. Delivery rate is about 300 m/min. DREF 3 schematic diagram is shown in the hi tech textile figure 4.
2.4. DREF-5
It was developed by Schalafhorst, Suessen and Fehrer Inc. The range of count to be spun from this system is from 16�s to 40�s Ne.Production speed is up to 200m/min.The schematic diagram of the DREF 5 is shown in the figure 5. The individualized fibres from a single sliver are fed through a fibre duct into the spinning nip at an angle to the yarn axis, so that they are stretched as far as possible, when fed into the nip[7]. This hi tech textile spinning system was not commercialized due to some reasons.
High-Tech Textiles Pave The Way For Glowing Garments
[ 2010/10/20 12:29 | by admin ]
2010/10/20 12:29 | by admin ]
The yarns have been developed by The William Lee Innovation Centre (WLIC), based in the University's School of Materials -- and have the potential to be incorporated into clothing worn by cyclists, joggers and pedestrians.
Current high visibility products -- such as those used by emergency services, cyclists and highway maintenance workers -- depend on external light sources to make them visible.
They can be ineffective in low light situations and require a light source from something like vehicle headlights to make them visible. This can lead to the wearer being seen too late.
hi tech textileThe latest WLIC development, made from electroluminescent (EL) yarns, allows the wearer to be permanently visible and therefore improves personal safety.
EL yarn is a novel technology, which emits light when powered by a battery. Its development has been based on thin film electroluminescent technology.
The yarn consists of an inner conductive core yarn, coated with electroluminescent ink -- which means it emits light when an electric current is passed through it -- and a protective transparent encapsulation, with an outer conductive yarn wrapped around it.
hi tech textileWhen the EL yarn is powered with an inverter the resultant electrical field between the inner and outer conductor causes the electroluminescent coating to emit light. The emission of light occurs between the contact points between the outer yarn and the inner yarn.
Other potential applications for the yarn include flexible woven or knitted road safety signs that communicate written instructions.
Dr Tilak Dias, Head of the WLIC, said: "At the moment the EL yarn we have developed is less flexible than conventional yarns. But it is more flexible than current optical fibres that are incorporated within fabrics to provide illumination.
"EL yarn can be easily incorporated into a knitted or woven fabric and the resultant active illuminating fabric provides illumination when it is powered hi tech textile.
"The luminance of a single strand of the EL yarn is greater than that of photoluminescent glow yarns, which are currently used in some high visibility applications.
"Weaving or knitting the yarn in a particular manner, so that more yarn per unit area is achieved, improves the luminance of the EL yarn."
Current high visibility products -- such as those used by emergency services, cyclists and highway maintenance workers -- depend on external light sources to make them visible.
They can be ineffective in low light situations and require a light source from something like vehicle headlights to make them visible. This can lead to the wearer being seen too late.
hi tech textileThe latest WLIC development, made from electroluminescent (EL) yarns, allows the wearer to be permanently visible and therefore improves personal safety.
EL yarn is a novel technology, which emits light when powered by a battery. Its development has been based on thin film electroluminescent technology.
The yarn consists of an inner conductive core yarn, coated with electroluminescent ink -- which means it emits light when an electric current is passed through it -- and a protective transparent encapsulation, with an outer conductive yarn wrapped around it.
hi tech textileWhen the EL yarn is powered with an inverter the resultant electrical field between the inner and outer conductor causes the electroluminescent coating to emit light. The emission of light occurs between the contact points between the outer yarn and the inner yarn.
Other potential applications for the yarn include flexible woven or knitted road safety signs that communicate written instructions.
Dr Tilak Dias, Head of the WLIC, said: "At the moment the EL yarn we have developed is less flexible than conventional yarns. But it is more flexible than current optical fibres that are incorporated within fabrics to provide illumination.
"EL yarn can be easily incorporated into a knitted or woven fabric and the resultant active illuminating fabric provides illumination when it is powered hi tech textile.
"The luminance of a single strand of the EL yarn is greater than that of photoluminescent glow yarns, which are currently used in some high visibility applications.
"Weaving or knitting the yarn in a particular manner, so that more yarn per unit area is achieved, improves the luminance of the EL yarn."
AkzoNobel develops hi-tech textile coating – Invisulux
[ 2010/10/20 12:27 | by admin ]
2010/10/20 12:27 | by admin ]
hi tech textile A revolutionary new paint has been developed by AkzoNobel which cracks one of the biggest ever scientific challenges – invisibility.
Working with renowned nanotechnology Professor Olaf Proli, the AkzoNobel has developed a hi-tech textile coating – Invisulux – which renders people wearing the painted garments invisible. Successful trials have already been carried out by interested security and defense organizations.
Working closely with AkzoNobel’s own scientists, Professor Proli has created a special molecule which manipulates the visible portion of the electromagnetic spectrum, allowing light to pass straight through.
“We have finally converted science fiction into science fact,” said the Norwegian nanotech expert. “We’ve been able to unravel the mysteries of the ultraviolet portion of the solar spectrum to develop a coating which is transparent to visible light.”
hi tech textile Exact details are being kept under wraps, but the implications for security use are obvious, while other interested parties include entertainment organizations and movie studios.
“The science is mind-blowing, but this is a real technological breakthrough,” added AkzoNobel’s Head of Nanotech Coatings, Dr Neil Pear. “As the world’s biggest coatings company, we strive to push back boundaries and pioneer new technologies and hi tech textileInvisulux is here to stay – it certainly isn’t a now-you-see-it-now-you-don’t product.” Investigations into further applications and commercialization of the coating are ongoing.
The company has already developed camouflage coatings and paint which can influence the visibility of aircraft and ships to radar.
Working with renowned nanotechnology Professor Olaf Proli, the AkzoNobel has developed a hi-tech textile coating – Invisulux – which renders people wearing the painted garments invisible. Successful trials have already been carried out by interested security and defense organizations.
Working closely with AkzoNobel’s own scientists, Professor Proli has created a special molecule which manipulates the visible portion of the electromagnetic spectrum, allowing light to pass straight through.
“We have finally converted science fiction into science fact,” said the Norwegian nanotech expert. “We’ve been able to unravel the mysteries of the ultraviolet portion of the solar spectrum to develop a coating which is transparent to visible light.”
hi tech textile Exact details are being kept under wraps, but the implications for security use are obvious, while other interested parties include entertainment organizations and movie studios.
“The science is mind-blowing, but this is a real technological breakthrough,” added AkzoNobel’s Head of Nanotech Coatings, Dr Neil Pear. “As the world’s biggest coatings company, we strive to push back boundaries and pioneer new technologies and hi tech textileInvisulux is here to stay – it certainly isn’t a now-you-see-it-now-you-don’t product.” Investigations into further applications and commercialization of the coating are ongoing.
The company has already developed camouflage coatings and paint which can influence the visibility of aircraft and ships to radar.
With the rising level of automobile production
[ 2010/10/20 12:25 | by admin ]
2010/10/20 12:25 | by admin ]
With the rising level of automobile production and its corresponding worldwide stocks based on the rapid industrialisation in Asia, Africa and Latin America plus the rising demand in Eastern Europe, the proportion of textiles in a motor car is increasing in response to more stringent comfort and safety needs in industrialised countries like the USA, Japan and Western Europe.
Automobile hi tech textile, which are non apparel hi tech textile, are widely used in vehicles like cars, trains, buses, aircrafts and marine vehicles. Hence, the term automobile hi tech textile means all type of hi tech textile components e.g. fibers, filaments, yarns and the fabric used in automobiles.
Nearly two third of the automobile hi tech textile are for interior trim, i.e. seat cover, carpets and roof and door liners. The rest is utilized to reinforce tyres, hoses, safety belts, air bags, etc.
Automobile hi tech textile, which are non apparel hi tech textile, are widely used in vehicles like cars, trains, buses, aircrafts and marine vehicles. Hence, the term automobile hi tech textile means all type of hi tech textile components e.g. fibers, filaments, yarns and the fabric used in automobiles.
Nearly two third of the automobile hi tech textile are for interior trim, i.e. seat cover, carpets and roof and door liners. The rest is utilized to reinforce tyres, hoses, safety belts, air bags, etc.
Nanotech Researchers Develop High-Tech 'Smart Textile'
[ 2010/10/20 12:24 | by admin ]
2010/10/20 12:24 | by admin ]
Dr. Juan Hinestroza, an assistant professor in the Department of Textile Engineering, Chemistry and Science at NC State, and researchers at the University of Puerto Rico have pioneered a method to develop chemical-resistant textiles by attaching nanolayers to natural fibers hi tech textile.
These layers are only 20 nanometers – or 20 billionths of a meter – thick and made of different polymers that can control what passes through the layer. The process is called selective transport.
“These layers are customized for different chemicals,” Hinestroza said. “We can specifically block warfare agents like mustard or nerve gas, or industrial chemicals, while still allowing air and moisture to pass through to make the fabric breathable.”
Chemicals are blocked, Hinestroza said, when they bind to the polymers of the fibers, which are made of materials that are attractive to the chemical agents hi tech textile.
These fabrics could be made into garments that offer very high levels of protection. “We can attach hundreds of nanolayers to a fiber without affecting its comfort or usability. This idea has been tried in the semiconductor industry, but hasn’t been achieved with flexible fabrics,” he said hi tech textile.
The nanolayers adhere to natural fibers by electrostatic force, similar to the way that magnets attract or repel depending on the electromagnetic charge, Hinestroza said.
There are literally dozens of potential uses of this technology involving smart textiles. “Imagine gloves coated with arthritis drugs; military uniforms coated with antibacterial layers to prevent infection in case of wound; antibacterial sheets for submarine bunks to prevent illness spread as these bunks are shared by enlisted personnel; and comfortable protective clothing against several chemical and biological warfare agents,” Hinestroza said.
Additional uses could include diapers coated with anti-itching polyelectrolytes as well as tissues coated with anti-allergy medicine, he added.
Hinestroza and his colleagues are funded by the Institute of Textile Technology and recently received a seed grant from the NC State nanotechnology steering committee.
The team’s initial work was published recently in the scientific journal Nanotechnology.
These layers are only 20 nanometers – or 20 billionths of a meter – thick and made of different polymers that can control what passes through the layer. The process is called selective transport.
“These layers are customized for different chemicals,” Hinestroza said. “We can specifically block warfare agents like mustard or nerve gas, or industrial chemicals, while still allowing air and moisture to pass through to make the fabric breathable.”
Chemicals are blocked, Hinestroza said, when they bind to the polymers of the fibers, which are made of materials that are attractive to the chemical agents hi tech textile.
These fabrics could be made into garments that offer very high levels of protection. “We can attach hundreds of nanolayers to a fiber without affecting its comfort or usability. This idea has been tried in the semiconductor industry, but hasn’t been achieved with flexible fabrics,” he said hi tech textile.
The nanolayers adhere to natural fibers by electrostatic force, similar to the way that magnets attract or repel depending on the electromagnetic charge, Hinestroza said.
There are literally dozens of potential uses of this technology involving smart textiles. “Imagine gloves coated with arthritis drugs; military uniforms coated with antibacterial layers to prevent infection in case of wound; antibacterial sheets for submarine bunks to prevent illness spread as these bunks are shared by enlisted personnel; and comfortable protective clothing against several chemical and biological warfare agents,” Hinestroza said.
Additional uses could include diapers coated with anti-itching polyelectrolytes as well as tissues coated with anti-allergy medicine, he added.
Hinestroza and his colleagues are funded by the Institute of Textile Technology and recently received a seed grant from the NC State nanotechnology steering committee.
The team’s initial work was published recently in the scientific journal Nanotechnology.
