Advanced Weaving Technologies For Innovative Products

Stäubli offers cutting-edge machinery for the most sophisticated technical textiles

TW Special Report

Technological development in the production of textile surfaces has enabled the manufacture of a growing number of automobile components based on technical textiles. These components include body parts as well as interior trim parts such as floor mats, seat covers, ceiling panels and dashboards. In aircraft construction, it is now standard practice that fuselages — or nearly entire aircraft bodies — are built with the aid of industrial textiles. Highly versatile fabrics for such applications have been created through the application of significant know-how by weavers and their machinery suppliers — both of whom invest heavily in technical advancements.

Research and development continues to be intensified in the textile manufacturing industry throughout the entire production chain and supported by manufacturers and specific training programs offered by textile universities. Today, the list of potential applications for textile products can be almost infinitely extended.

Regarding composite materials, a significant step toward serial production was shown by multiple exhibitors at this year’s JEC trade shows in Europe and the United States. But in terms of more complex composites such as 3-D multilayer weaves and spacer fabrics, product engineers in all industries — including automotive, building construction, leisure, nautical and aeronautic — are striving to identify precise areas of application in order to merge the advanced weaving possibilities with their needs in terms of technical requirements and woven components. Thus, product designers must understand the possibilities and special advantages offered by latest weaving machines, such as those in the product range of Switzerland-based Stäubli International AG. These machines offer a wide range of capabilities, such as freedom in design and format, fail-safe operation, drapability, precise definition of the elasticity of the fabric, weaves with reinforcement in certain areas over the weaving width, supporting the integration of the fabric in any component, and precise and gentle yarn treatment — the basis for perfect quality in the final product. Furthermore, advanced weaving technologies can shorten workflows, making for more economical production of the fabric and the final product.

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Airbag fabrics may be woven in one piece with a woven seam.

3-D Textiles In A Wide Range Of Formats

In recent years, a new type of technical multilayer fabric — so-called 3D textiles — has appeared on the market. Finished products incorporating these textiles are used in applications with increasingly stringent mechanical requirements. One specific example is the aerospace industry, where traceability and reproducibility are central aspects of product specifications. Critical in the production of such industrial textiles is the ability to precisely control the arrangement of the warp threads within the shed of the various layers. This precise control is perfectly supported by Stäubli’s UNIVAL 100 — a unique servo-driven single-end control jacquard machine. The warp-thread control supported by servo-driven individual actuators, allows the production of a great variety of technical textiles and 3-D multilayer fabrics. Depending on the configuration desired, the unit can be fitted with anywhere from 512 to 15,360 actuators in various designs.

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Stäubli’s LXL Jacquard machine is suitable for weaving very high-load fabrics such as airbags.

Modern Airbag Manufacturing Methods

The latest jacquard weaving technology has made it possible to manufacture complex airbag structures with woven seams. These one-piece woven (OPW) airbags give designers great flexibility in creating patterns and designs. They also reduce the number of production steps, thereby reducing production time. Side-curtain airbags, activated by a lateral collision, are shaped according to the interior contour of the particular car they are fitted in. Their shape and structure are created at the weaving stage. As a result, no subsequent sewing operation is required. To effectively protect passengers in a rollover, OPW side-curtain airbags must remain inflated for several seconds. This is best accomplished by using a sealed cushion with woven seams. OPW airbags are woven on modern high-speed jacquard weaving machines. The warp material, the variety of fabric patterns, and the importance of precisely shaped airbags require the use of a robust and reliable jacquard machine. For maximum flexibility in the creation and design of airbags, weavers require a high number of hooks, which makes control of each individual warp end possible. The extra-reinforced drive elements and the rigid structure of Stäubli’s LXL jacquard machine — available in formats from 6,144 hooks to 18,432 hooks — are ideal for weaving very high-load fabrics such as airbags. The machine’s lifting mechanism ensures accurate shed geometry and vibration-free operation even at high speeds.

At the heart of the LXL are MX modules, serving as the link between the lifting mechanism and the harness. For each weft insertion, each hook of the modules can be positioned either up or down, corresponding to the individual pattern required for each type of airbag and adapting to the complexity of the design. Each hook is driven independently, thanks to the operator-friendly JC7 controller in which all weaving data are stored and then transmitted to the jacquard modules, pick by pick. All data can easily be transferred to and from the jacquard controller via USB stick or network.

Delicate Automated Weaving Preparation

Filtration fabrics are among the technical textiles upon which users place the highest demands. Filter fabrics are used in process filtration, silk screening, as filter components, in medical applications and also in architecture. Ultrafine fabrics increasingly are used in the high-tech field of smart textiles.

One thing is common to all these application areas: Precision fabrics are required — and this calls for customer-specific solutions. Highly specialized weaving mills possess the necessary know-how. These mills are not just weavers, but can respond to the individual needs of the application technology and can ensure on-time delivery of a specified end product made using the finest yarns.

But before the yarn can be woven, the warp must be drawn into the weaving harness. Warps can measure up to 400 centimeters in width, comprising tens of thousands of threads — sometimes in numbers approaching 100,000 threads.

To streamline the drawing-in process, Stäubli offers automatic drawing-in machines that can handle up to 200 ends per minute. Here, the extreme yarn count of sometimes less than 7 denier, or 32 microns, places extremely high demands on the drop wires, heddle, reed, and every other element that comes into contact with the threads.

State-of-the-art image processing makes it possible to flawlessly separate individual threads from a dense sheet of warp threads featuring up to 200 threads per centimeter. Programmable repeat control ensures correct reed dent and drawing in to harness frames, thereby ensuring the specified fabric properties. Stäubli’s automatic drawing-in machines not only handle the finest threads very carefully, but also can handle different types of threads in the same warp layer. Even abrasive yarns such as Kevlar® or fiberglass can be processed, thanks to specially coated thread-handling elements. The SAFIR S80 can even work from two stacked warp beams — up to four different thread layers and materials including S- and Z-twisted yarns.

As the technical and quality requirements for technical textiles and composites grow, machinery manufacturers will continue to support the industry with ever-increasingly sophisticated machinery and technologies.

September/October 2016

Technology Meets Tradition In Scotland

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The Johnstons of Elgin knitwear mill in Hawick, Scotland, houses an original William Lee Stocking Frame.

Centuries-old Johnstons of Elgin keeps the cashmere flag flying high in Hawick.

Dr. Andre West, Technical Editor

William Lee was an English clergyman and inventor who devised the first stocking frame in 1589. The fundamental principle of knitting on this machine remains the same to this day, and his design was not improved upon for some two hundred years. Lee’s first machine produced a coarse wool stocking — unfortunately not the finery of silk that could be knitted by hand. Legend has it that Queen Elizabeth I refused Lee a patent on the basis that the machine would kill industry, and said: “Thou aimest high, Master Lee. Consider thou what the invention could do to my poor subjects. It would assuredly bring to them ruin by depriving them of employment, thus making them beggars.”

Hawick: A Traditional Textile Town

Hawick — pronounced Hoyk by the locals — is a town in the Scottish Borders is known for its centuries-long traditions, one of which is knitting. James Hardie introduced the stocking-frame to Hawick in 1771. In 1791, there were 12 frames in Hawick that employed 14 men and 51 women. The introduction of this new technology into mills was not without its consequences. In 1779, Ned Ludd destroyed two stocking frames in England. His name — and the word Luddite — has become synonymous with any movement opposed to increasing industrialization, or new technology resulting in a reduced labor force while increasing production. In reaction, Parliament introduced “The Destruction of Stocking Frames Act of 1812” making the destruction of mechanized stocking frames a capital felony punishable by death. With this new law in place, by 1844 there were 2,605 knitting frames in Scotland, the majority found in Hawick.

By the mid-19th century, Hawick companies had moved beyond stockings to producing all types of knitted undergarments. In the late 19th century, finer raw materials, such as cashmere, was imported, which established Hawick as the cashmere capital of the world for almost 200 years. Companies including Hawick Cashmere, Hawick Knitwear, Johnstons of Elgin, Lyle & Scott, Peter Scott Pringle of Scotland, Scott and Charters, and George Woodcock & Sons all have had, and in some cases still have, manufacturing plants in Hawick, producing some of the most luxurious cashmere and merino wool knitwear known in the world today.

kabookspineJohnstons Of Elgin

While industrial knitting was establishing itself in the Scottish Borders, 225 miles north of Hawick in a town called Elgin, a woollen mill was opened in 1797 by two families — the Johnstons and the Harrisons — called Johnstons of Elgin. They established a plant that still is in production today.

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A Johnstons sample book from the 1884-85 spring season

Originally, Johnstons produced linen, flax, oatmeal and tobacco. After the introduction of textiles, the non-textile products were phased out. Johnston pioneered the use of tweed for camouflage, and the style became known as Scottish estate tweeds. Wool was first referred to in the Johnstons of Elgin records in 1801 and has continued to be a key raw material for the company. Johnstons is the only manufacturer that goes from raw material through every stage of the manufacturing process — including spinning, dyeing, and weaving or knitting — to finished products on one site, thus making it the only vertical mill in Scotland.

Over the years as its business has expanded, Johnstons has endeavored to build a community, one that it professes is the company’s greatest asset. Johnstons has been one of the largest independent employers in the Elgin area since the mid-1800s. Currently, the company employs just over 1,000 people.

Its more than 200 years of expertise in textile manufacturing and sourcing only the finest raw fibers available allows Johnstons to lead the world in luxury cashmere and woolens supplying the world’s top fashion luxury brands. Cashmere is one of the finest, most luxurious natural fibers in the world renowned for its extreme softness, warmth and lustrous quality. The dramatic fluctuation in temperature throughout the year — rising to above 40°C in summer and dropping to below 40°C in winter — helps the goats to grow their beautiful, downy under-fleece. The natural crimp of cashmere fibers helps them to interlock during manufacturing and allows the fibers to be spun into very fine, lightweight fabrics. This is where Johnstons’ cashmere sets itself apart said David Hamilton, operations director. “There are in the region of 30 different processes involved in transforming raw fiber into luxurious products,” Hamilton said. Each evening, the tail of the day’s finished fabric is laid out for Hamilton to inspect as he is leaving. He strokes each fabric and gives his seal of approval by flipping the end back into the barrel as if he has just blended the perfect whiskey.

“The contemporary Johnstons of Elgin mill uses cashmere blended from fibers carefully selected from Mongolia, China and Afghanistan; and lambswool from Australia,” Hamilton said. “Combining the different qualities of these fibers to optimize the performance of the fabrics, allows Johnstons to provide the best combination of durability, hand and feel of any given product.”

Most of the cashmere the company uses is gathered from approximately 1 million goats, which are herded in the traditional ways used for hundreds of years. This unique lifestyle helps to preserve these fragile communities. Although working directly with herders and farmers is difficult, Johnstons collaborates as a founding member of the Sustainable Fiber Alliance to develop sustainability programs to improve the situation for both goats and herder communities.

Fully Fashioned Garments

In the 1970s, the company expanded its knitwear operation to Hawick as the town had grown to be historically known for cashmere knitwear and skilled craftsmen. Some of Johnstons’ knitwear is fully fashioned — meaning that each garment is knit to shape to give the best fit — on older Bentley-Cotton full fashioned frame machines. The ribbed trimmings, cuffs, collars, welts, pockets and straps first are knitted on separate machines. These are then transferred onto the frames that knit the fronts, backs and sleeves to complete the garment. The garments are carefully washed and milled, before the final step where collars are linked to the garment, and buttons, buttonholes and trims are added — many by hand.

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In recent years, Johnstons of Elgin has invested in machines from Japan-based Shima Seiki including SWG041mini and Shima Seiki Mach 2XS machines.

In recent years, Johnstons has invested in the most advanced WholeGarment equipment from Japan-based Shima Seiki Mfg. Ltd. The latest Shima machines installed at Johnstons allow the machine to take much of this very labor intensive assembly process away by knitting the majority, if not all of the garment, on the machine to the exact size thereby eliminating the need to sew the garment.

The Hawick facility knits sweaters, cashmere hats, scarves, accessories and gloves on a modern Shima Seiki SWG041mini. The company also recently invested in Shima’s flagship machine — the 4 Bed Mach 2XS WholeGarment machines.

However, what has not changed at Johnstons over the years is the professional devoted craftspeople — some of whom have been honing their skills for almost 50 years. The experience and tradition rooted in their history have been passed down through generations to ensure they are preserved and represented in the timeless pieces made today. Central to supporting and developing its legacy is Johnstons’ own training center in Hawick that offers apprenticeships to locals concerned with the preservation of traditional crafts. The company is doing its utmost to ensure the conservation of these increasingly rare skills.

It would be a crime not to use each and every ounce of cashmere into a crafted piece of fabric. This has become difficult with today’s fashion trends and colors turning quicker than the local salmon in the global industry. Johnstons devised a plan to process the batch ends of fibers, yarns and cut-offs, which are reused and redyed to produce scarves and other products. Each piece features materials available at the time of making so every product is unique and makes a beautiful gift worth countless hours of effort and care.

Traditions Run Deep

When touring the plant, one gets a sense the employees feel blessed to carry the traditions of their ancestors forward. They have no choice but to produce the perfect garment every time. The mill does not close for any unofficial holidays except one — the yearly Hawick Common-Riding festival. The event commemorates horse riding of the boundaries of the Border towns’ common land, victory over the English army in 1514 and — most importantly — capturing the flag. The event, sponsored in part by Johnstons, starts with the election of that year’s principal man — known as the Cornet — in the spring, who is chosen from among the community’s young established men. The flag is then given to the Cornet, who is reminded that the flag is “the embodiment of all the traditions that are our glorious heritage.” The Cornet is charged to ride the marches of the community of Hawick and return the flag “unsullied and unstained.” Rides today involve hundreds of horses culminating in the town’s center where hundreds of locals, many of them Johnstons employees, crowd the sidewalks to cheer the riders as they pass through.

It is well-known in the 21st century that technology and progress cannot be stopped like Queen Elizabeth I and Ludd may have wished. Manufacturing traditions run deep in Scotland. However, these traditions do not stop investment in technology that keeps Johnstons at the forefront of fashion even after all these years in business. The company has embraced manufacturing challenges just as the established youth of its town are asked to do each year at the Common-Riding festival.

September/October 2016

Zhejiang Transfar To Acquire Tanatex Chemicals

China-based Zhejiang Transfar Co. Ltd. has signed an agreement to acquire 100-percent of the shares of the Netherlands-based Tanatex Chemicals from TPC Holding BV. Once the acquisition is complete, Tanatex will operate as an independent entity under the existing Tanatex brand within the Transfar Group.

“Together we will be in a better position to support our globally active client base and their growth,” said Marco de Koning, CEO, Tanatex Chemicals. “Transfar Chemical’s strong Asian market position offers a great opportunity to further develop Tanatex Chemical’s position in Asia, a key focus area, especially after opening our state-of-the-art facility in Rayong, Thailand, in 2014. Moreover, Transfar will benefit from our market coverage outside of Asia Pacific.”

September/October 2016

Huntsman Awards Jihua Group Super Black License

The Singapore-based Textile Effects Division of Huntsman Corp. has awarded a sole license to China-based Jihua Group so the company may manufacture, market and sell Huntsman’s patented reactive Super Black dyes in China. Both Huntsman and Jihua will sell the Super Black products under their respective tradenames. In addition, Huntsman granted Jihua the right to sub-license its Super Black dyes in China.

“This partnership will allow Jihua to complement our strengths in manufacturing and backward integration with Huntsman’s extensive global reach and technological innovation,” said Shao Bojin, chairman, Jihua Group.

September/October 2016

DyStar To Open Global Innovation Center In China

Singapore-based DyStar has announced plans to open a Global Innovation Center at its China-based DyStar Nanjing Colours Co. Ltd. by the end of March 2017. The 3,000-square-meter center will comprise state-of-the-art laboratories for research and development and process technology development as well as labs for dye and chemical synthesis and a scale-up unit for small production. The company reports the facility will aim to improve dyeing processes in terms of water and energy consumption and lower wastewater and pollution. DyStar will focus on textiles, but will look to grow new markets for its products.

September/October 2016

Nike, Apollo Affiliates Enter Into Partnership

Beaverton, Ore.-based Nike Inc. has entered into a partnership with funds affiliated with New York City-based Apollo Global Management LLC to bolster the apparel supply chain in the Americas by increasing regional manufacturing capabilities, enabling quicker delivery of more customized products to consumers and driving investment in sustainability. The partnership has established an apparel supply chain company, which has acquired two existing companies — apparel manufacturer New Holland; and embellishment, warehousing and logistics operator, ArtFX — through an investment from the Apollo-managed Special Situations I fund. The two companies will be updated and advanced to produce innovative, technical and customized apparel. The new supply chain company also plans acquire additional textile and apparel suppliers in the Americas to broaden its available products and create a vertically integrated apparel ecosystem.

“We are excited to be working with Apollo to rethink a new supply chain model to revolutionize apparel manufacturing in the Americas,” said Eric Sprunk, COO, Nike.

“We intend to work with management to develop a regional supplier capable of servicing the needs of a wide variety of customers, and we are particularly enthusiastic to be working with such an iconic brand as Nike,” said Josh Harris, co-founder and senior managing director, Apollo. “While Nike has not made a capital investment in the company, this strategic partnership is a testament to Nike’s commitment to increasing regional manufacturing capabilities, driving investment in innovation and creating long-term growth.”

September/October 2016

Tukatech Reports Sale To Bahir Dar University

Los Angeles-based Tukatech Inc. reports the Ethiopian Institutes of Textile and Fashion Technology at Bahir Dar University, Ethiopia, has purchased 50 licenses of the TUKAcad Learning Edition software featuring modules for pattern making, grading, marker making and digitizers.

“Historically, Bahir Dar University has been known for supplying the Ethiopian market with some of the best technicians who are now running most of the local businesses in many different sectors,” said Sonia Chhabra, director, Tukatech.

September/October 2016

Lenzing Invests In Specialty Fiber Production

Austria-based Lenzing Group reports it will expand its capacities for specialty fibers. “We will invest more than 100 million euros over the next 20 months to expand production capacities for our high-quality botanic fibers, 70 percent at the Heiligenkreuz site and 30 percent at Lenzing,” said Stefan Doboczky, CEO. The expansions at sites in Heiligenkreuz, Lenzing and Grimsby, England, will eventually result in an additional 35,000 tons of capacity. Approximately 10,000 tons of additional specialty fiber capacity will be available by the end of 2016, with most of the remaining capacity to be added during 2017.

Lenzing recently launched a sCore TEN strategy for the group, which included growing specialty fiber revenue to 50 percent by the year 2020 from their current proportion of 41.7 percent.

September/October 2016

Eastman Introduces Avra™

Kingsport, Tenn.-based Eastman Chemical Co. recently launched Avra™ Performance Fibers, which are manufactured using proprietary spinning technology to produce an ultra-thin polyester fiber. The Avra fibers are extruded with a removable binder polymer that can be washed away after the weaving or knitting process. The small, ribbon-like fibers that are left behind result in a silky fabric with soft hand and advanced moisture-management performance, according to the company.

Avra is produced in collaboration with Unifi Inc. in Yadkinville, N.C. The fiber’s development required a plant expansion that created jobs in the region. “Combining the technology and quality-driven expertise of Eastman and Unifi will help provide the industry with the next level of performance-enhancing fibers,” said Mark McNeill, vice president of technology and business development, Unifi.

September/October 2016

DAK Acquires Controlling Interest In Selenis Canada

Charlotte-based DAK Americas reports it has completed the acquisition of a controlling interest in Selenis Canada Inc. The transaction was recently completed with Portugal-based IMG Group, and was approved by the Canadian Competition Bureau. Selenis Canada operates a 144-kiloton-capacity polyethylene terephthalate resin plant in Montreal. Terms of the transaction were not disclosed.

September/October 2016

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