ITMA Technology: Weaving & Weaving Preparation
Abdel-Fattah M. Seyam, Ph.D., Technical Editor
Oerlikon Schlafhorst, Germany, exhibited the Autoconer X5, a new variation of the Autoconer 5 automatic package winders shown at the previous ITMA, with new features introduced. The winder is equipped with a separate motor for feeding the supply packages to the active position. A feeding motor operates only if a bobbin is depleted and a new bobbin is required, which saves energy compared to the previous bobbin feeding system that used a continuously running centralized motor and belt to drive the feeding positions.
The Autoconer X5 produces cone or cylindrical packages. The doffer detects the empty cylinder or cone package shape and rejects the package if it is not the shape that is programmed to process at the specific spindle. Further, if a magazine of a position does not have empty packages, the doffer takes a correct package from a neighboring magazine to avoid loss of production.
With previous Autoconer models, when a new lot starts, the operator has to manually wind the reserve of the first package for all positions. The Autoconer X5 forms the reserve on each package of the new lot automatically. The recognized advantages of this new feature are an increase in productivity; and consistency in position, winding tension and the amount of the reserve yarn, which results in avoiding problems for the next processes including packages for warping and weft packages for weaving.
Savio Macchine Tessili S.p.A., Italy, continued to show its Polar package winders that were exhibited at ITMA 2007. Two Polar package winders were shown at this ITMA: Polar E and Polar I/DLS (Direct Link System). The previous version of Polar E was equipped with automatic bobbin loading and manual doffing. Polar E now is offered with automatic bobbin loading and automatic doffing.
Polar I/DLS is similar to Polar I shown at ITMA 2007. However, the link to the spinning frame in Polar I/DLS is designed to work with ring-spinning machines that have a much higher number of bobbins.
Karl Mayer Textilmaschinenfabrik GmbH, Germany, continued to show its impressive innovations in warp preparation for sample and short orders. The company showed its new Multi-Matic® sample warper with creel capacity of 128 yarns or colors, which is a significant increase compared to the capacity of the Gir-O-Matic (GOM) 24 sample warper that was shown at the previous ITMA. This feature increases the capability of producing more intricate striped warps. Other features of the Multi-Matic sample warper include: warp length range of 35 to 1,500 meters; working width up to 2.25 meters; maximum warping speed of 800 meters per minute (m/min); and maximum color change speed of 800 m/min. The warper is equipped with a user-friendly interface to preprogram the leasing pattern and color selection. After the preprogramming and setting of the packages on the creel, the rest of the warping process is automatic, including the leasing for drawing-in and size rod separation, and there is virtually no need for operator intervention. The beaming process requires the operator to transfer the warp from the pattern drum to the warp beam. The beaming speed is 150 m/min. With such features and capabilities, the Multi-Matic sample warper can be used for extremely short samples, as short as 35 meters, or for short orders of 1,500-meter increments, which sets this warper to compete with sectional warpers.
Karl Mayer Multi-Matic® sample warper
CCI Tech's Lutan sample warper with super creel (right)
Drawing-in And Tying-in
Stäubli Group, Switzerland, introduced its Magma tying-in machine — which is capable of handling spun, multifilament and monofilament as well as polypropylene ribbons — for the first time at ITMA 2007. At the 2011 show, Magma T12 was exhibited. The new version is equipped with new optoelectronic patented system for detecting double yarns and separates them from the lease. The system does not need thread-specific separation needles or settings.
Stäubli introduced the Safir automatic drawing-in machine at ITMA 2007, and exhibited the new-generation Safir S80 drawing-in machine at this ITMA. Like the previous version, the S80 integrates the Delta drawing-in and the Opal leasing technologies. In the S80 model, a new thread separation unit detects double yarn using an imaging technique with a camera. The separation unit checks for yarn color and its correct sequence in the color pattern repeat. In case of the color not being in sequence, the system picks up the correct color without operator intervention. S80 is equipped with a user-friendly interface via intricate display to allow easy programming of drawing-in including color sequence. The system is network-compatible, which makes it possible to transfer drawing-in data created by computer-aided design, and thus repetition is avoided and errors are eliminated. Stäubli reported that the Safir S80 has been installed in many plants since its launch.
The competition in shed forming systems that started at ITMA 1999 with the introduction of the Grosse UniShed and Stäubli Unival 100 Jacquard systems continued. In fact, the competition expanded to include more shedding systems by other machine producers.
Stäubli commercialized Unival 100 in 2003. In 2007, the Unival concept was expanded in Unival 200 to individually control warp yarns using actuators in label machines. In Unival 200, the actuation is not limited to controlling only the shedding motion, but also main motions of the machine. The actuators are used to control: weft tension with individual control for each weft yarn that can be preprogrammed digitally; weft feed rate; warp tension; cloth take-up rate; latch needle for securing the filling yarn; and filling selection of up to eight colors. The concept was also expanded in Unival 500 to individually control harnesses in dobby shedding systems. Unival 500 uses more powerful actuators to control harness movement in a dobby shedding system. Each harness is controlled by an actuator that controls links connected to the harness. Clockwise and counterclockwise rotation of the actuators is decided based on which harnesses need to be raised/lowered to form the shed according to the weave design.
At this ITMA, Toyota Industries, Japan, joined the competition for individual harness control of dobby shedding systems with the E-shed Electronic Shedding Motion.
Mageba Textilmaschinen GmbH & Co. KG, Germany, exhibited its narrow shuttle weaving machine SL-MT 1/180 combined with a Mageba dobby shedding system in which a separate motor drives each harness. Each harness can be raised or lowered at different levels to form multisheds and allow for multi-weft insertion.
At this ITMA, Stäubli expanded the Unival 100 applications. A small-size Unival 100 combined with a narrow fabric shuttle weaving machine was shown at Mageba's booth to form multi-weft insertion for the production of medical and technical products. A very small-size Unival 100 termed Univalette, which is intended for working with a dobby shedding system, was shown at Stäubli's booth for weaving selvage labels.
GITEC Grosse Internationale Technologie GmbH, Germany, commercialized the improved UniShed 2 about two years ago. At ITMA, the unit was shown at Japan-based Tsudakoma Corp.'s booth on the ZW8100 water-jet weaving machine. It should be pointed out that this is the first time water-jet weft insertion has been combined with a Jacquard shedding system at ITMA.
Advantages Of Individual Yarn And Harness Control
The advantages of individual control of warp yarns and harnesses in Jacquard and dobby weaving allowed the separation of the Jacquard/dobby drive from the main weaving machine drive, leading to elimination of the complexity associated with coupling the weaving machine main drive with the shedding system; increased weaving speed; elimination of stop/start marks owing to reduction of load on the main motor; and formation of multisheds, enabling the formation of 3-D woven structures for medical, shaped preforms for composites. These systems set the stage for the development of multiphase weaving with intricate designs using the advances of the new dobby/Jacquard shedding systems.
Integration Of Weaving And Embroidery By Dornier
A highlight of the show was Germany-based Lindauer Dornier GmbH's air-jet weaving machine AWS 6/S 12 OC integrated with an embroidery mechanism that controls a set of yarns. The embroidery yarns are guided by needles and are raised up to move out of the reed dents — the reed is open-top. While they are out of the reed, these yarns are moved laterally depending on the embroidery design, and then are lowered and entered into the reed dents. The embroidery yarns form sheds to interlace with the weft yarns according to the design. The sequence is repeated until a design repeat is formed. Besides the competition with embroidery machinery, the system could replace the weaving technique known as extra warp figuring that requires dedicated Jacquard hooks. The system also competes with the embroidery effect produced by yarn lay-in in warp knitting. While intricate design could be obtained by the system, the degree of intricacy is limited compared to that of traditional embroidery because of the limitation of the lateral movement of embroidery needles or yarns. Another limitation of the system is that the embroidery yarn size is limited to the reed dent width.
Dornier Air Jet Type AWS 6/S 12 OC with Embroidery Unit weaving embroidered curtain
Speed And Versatility
Weaving speeds and filling insertion rates reached their maximum at previous ITMA shows. The machine manufacturers competed mainly by showing different machines weaving a broad range of fabrics for different markets, emphasizing diversity that includes weaving articles for home textiles; apparel textiles; and technical textiles such as filters, preforms for composites, medical and ropes. Examples of diversity offered by various machine manufacturers include:
- Dornier: embroidered curtain fabric - A1 air-jet, Jacquard African damask for shirting - air-jet, womenswear - rapier, filter fabric - rapier;
- ITEMA Weaving, Switzerland, including Sultex, Vamatex and Somet: coating - rapier, shirting - rapier. fancy apparel - rapier, fancy denim - air-jet, sheeting - air-jet, geotextiles - projectile, home textiles - rapier, terry towel - rapier;
- Panther Textiles Co. Ltd., Hong Kong: labels - rapier, technical - rapier, shirting - rapier, fancy womenswear - rapier;
- Picanol NV, Belgium: stretch denim - rapier, para-aramid - rapier, worsted fabric - rapier, coating - rapier, upholstery - rapier, lining - air-jet, parachute fabric - air-jet, automotive - air-jet, sheeting - air-jet, terry - air-jet, apparel - air-jet, womenswear - rapier;
- Toyota: gingham shirting - air-jet, wool suiting - air-jet; fancy voile curtains - air-jet, denim fabric - air-jet, terry towel - air-jet;
- Tsudakoma: pongee - air-jet, Jacquard terry towel - air-jet, heavyweight Jacquard fabric - water-jet, womenswear - air-jet.
- Mageba shuttle weaving: medical, net shape for composites - T-beam, I-beam, tubular and such, ropes with sheath/core layers;
- Jäger of Schlatter Industries AG, Switzerland: technical fabrics - SK560 rapier weaving machine equipped with high tension let-off and beat-up;
- Vúts Liberec, Czech Republic: leno fabrics for the production of glass fiber preforms for fiber reinforced composites - Cam El and Combine air-jet; and
- Jürgens Maschinenbau GmbH & Co. KG, Germany: technical textiles including multi-axial fabrics - JP-4000 projectile 6-10-meter wide weaving machine equipped with ITEMA projectile and Stäubli Unival 500 dobby.
The absence of the Sultex M8300 multiphase weaving system from the show for the second consecutive time is a disappointment. The author addressed the reasons behind the limitations of the M8300 in previous ITMA reviews. Its greatest disadvantages are the limited weave design capability and warp yarn densities. However, with the new development in shedding systems addressed above, it is believed that opportunities are emerging to develop multiphase weaving using dobby/Jacquard shedding systems with individual harness/yarn control.
Mageba Shuttle Weaving
The comeback of shuttle weaving as seen at ITMA 2007 continued at this ITMA. Mageba showed its narrow shuttle weaving machine SL-MV 140 1/315 combined with Stäubli 's Unival 100 Jacquard shedding system. The combination of the weaving machine and Unival 100 permitted the formation of multisheds and multi-weft insertions to form shaped and 3-D articles for medical and technical applications such as bifurcated and trifurcated grafts; tubular structures for fire and garden hoses; and T-, I- and C-shaped preforms for fiber-reinforced composites. While these products have been produced using traditional technologies, the use of Unival 100 with shuttle weaving provides an ultimate electronic system that allows switching from weaving a shaped article to weaving another with ease and speed that have never before been seen.
Application examples of woven fabrics formed using Mageba shuttle loom
Mageba also exhibited its narrow shuttle weaving machine SL-MT 1/180 combined with its dobby shedding system, in which each harness is driven by a separate motor. Thus, each harness can be raised or lowered at different levels to form multisheds and allow for multi-weft insertion.
ITMA 2007 witnessed serious developments in air-jet weaving to reduce energy consumption to offset the increase in energy costs. Further developments were exhibited at this show. Dornier showed its TandemPlus system, consisting of a movable tandem nozzle attached to the reed bar for variable-width weaving and a third fixed-position nozzle for weaving slick or subtle filling yarns. On wide machines, the Dornier TRIM system features the movable tandem nozzle and movable third nozzle. Both systems reduce the air pressure and power consumption.
Picanol exhibited four Omni plus Summum air-jet weaving machines equipped with a patent-pending AirMaster software system that monitors air consumption and detects leakage and clogging. AirMaster also could be used to carry testing procedures to check all air elements. Identifying leaks and clogs, and managing air lead to reduced air consumption.
Wireless Smart Label
TexTrace AG, a subsidiary of Jakob Müller Holding AG, Switzerland, demonstrated a new wireless smart label for article identification using radio frequency (RF) technology. The label can be read from a distance of up to 7 meters using a RFID reader. The smart label consists of two parts: a woven antenna comprising textile yarns and electrically conductive yarns; and a chip with integrated circuit. The integration of the antenna and the chip is achieved with precise placement using a new automated process that applies pressure and heat to connect the chip to the antenna using thermoplastic adhesive. The system has a range of applications that include the detection of numerous articles simultaneously, sales tracking, checkout, counterfeit detection, theft protection, inventory, order tracking and more. TexTrace reports repeated laundering does not affect label performance. An additional feature of the system is its ability to connect to mobile phones, thus allowing remote tracking of data. While the cost of the smart label is expected to be much higher than the traditional label cost, the time and labor savings in conducting the above tasks would translate to higher profit.
Developments introduced at previous ITMAs — such as automatic pattern change, direct drive, quick style change, variable pick density, variable speed, automatic stop/start mark prevention, on-loom woven fabric inspection and adaptive control system for air-jet weft insertion — are well-established and are becoming the standard owing to the demand for versatility and high-quality fabrics.
It is strongly believed that the new dobby and Jacquard shedding systems will revolutionize weaving technology and help weavers find new uses for these technologies in intricate textiles as well as functional smart, industrial, and technical fabrics. Given the establishment and the spread of the individual harness/yarn control of dobby/Jacquard shedding systems, multiphase weaving with no limitation in design capability or thread density is expected to be developed soon. Such development will take the weaving speed to new levels while producing intricate as well as technical textile products. Another route for increasing the weaving speed is twofold: continue the increase of electronic controls and thus reduce heavy mechanical parts; and replace heavy metal parts with much lighter fiber-reinforced composites.
The new developments in weaving and weaving preparation equipment provide a range of opportunities for woven fabric manufacturers and allow the production of much smaller orders than ever before with minimal waste.
The shuttle comeback for two successive ITMA shows is a welcomed event owing to its success in producing specialty industrial and medical products. Shuttle weaving is a viable technology for the formation of net-shaped products for medical and technical textiles including preforms for fiber-reinforced composites.
Manufacturers have responded to the need to reduce environmental impact through reduction in energy consumption and raw material waste including reduced selvage waste. Future ITMAs are expected to reveal more advances in this direction due to the mounting pressure resulting from increases in the costs of energy, raw material and waste disposal.
TW's ITMA technology coverage will continue in the March/April 2012 issue with reviews of the flat knitting and quality control/textile testing sectors; with further coverage in subsequent issues.