The types of creel available
The Opt-O-Matic can be supplied with yarns from a carriage, magazine, swivel-frame or standard creel when processing technical filament and spun yarns.The textile and clothing industry is continuing to pin all its hopes on technical textiles, especially in the highly developed world. According to the Industrieverband Veredlung, Garne, Gewebe, #
The standard creel has one or two rows, and operates without reserve loading. It is therefore suitable for packages having long running lengths. In comparison, the swivel-frame creel includes a loading device for the reserve packages. TThe frame-like structure can be moved in order to bring the new yarn into position. The magazine creel has two bobbin positions for every take-off position. This arrangement, which is used in conjunction with knotting-on of the yarn reserve, allows the yarn to run continuously whilst the packages are being changed. The carriage creel uses a bobbin carriage for supplying the yarns efficiently, and these can be moved into or out of the swivel-frame creel one after the other. By selecting the most suitable accessories, the creels can be adapted to suit the specific conditions in which they are used.
Examples of effective auxiliary components include vertical and horizontal balloon limiters, foam rubber covers on the bobbin plates, covers on the yarn tensioner or a special draw-off holder, which replaces the KFD yarn tension controller – if the yarn is too heavy for overhead take-off. If required, the swivel-frame creel can also have five or six levels for use in technical applications. Another modification relates to the use of a solid steel frame construction with extendable brake walls for holding the yarn guides and yarn tensioners when processing packages having a diameter of up to 320 mm.
However, the most important step in customising the creels to suit the specific end-use is to use the most suitable yarn tensioning system in each case.
The MULTITENS yarn tensioner
The KFD-AIR compensating yarn tensioner and the AccuTense computer-controlled induction yarn tensioner, which uses the principles of eddy-current braking, are generally used in technical applications. However, the MULTITENS are also recommended for this particular application.
This flexible and efficient piece of creel equipment allows conventional as well as special technical yarns to be processed at take-off speeds of up to 1,200 m/min, so that a yarn tension range of 3 cN to 250 cN can be catered for. The MULTITENS system guarantees uniform yarn tension levels under every condition, regardless of the count, the characteristics of the yarn, the friction values, the package diameters, the warping speeds or the creel parameters, such as the length and draw-off angle. This is an important prerequisite for weaving textiles with uniform and consistent characteristics. When producing technical woven fabrics in particular, the system offers specific cost advantages, since different package diameters can be processed, without reducing the quality of the fabric because of yarn striping.
The uniform yarn tension is the result of efficient control at every individual tensioner position. To do this, the yarn tension sensor determines the actual value, the computer compares it with the target value that has previously been input, and the yarn tensioner corrects any variations. Despite this individual position control facility, the entire system communicates via a bus system and can be set up simply by connecting a few cables.
MULTITENS is also extremely efficient as far as data management is concerned. An integrated database enables the article-specific parameters to be stored, and these can be called-up easily and securely if required. This enables the creel preparation times to be reduced considerably.
The production data, such as the yarn tension for each position, can be configured across the entire warp. This targeted process recording technique is particularly important in technical applications for providing the required certification, such as when producing certified woven textiles for airbags and medical textiles.
Another important advantage of MULTITENS is that it handles the yarns gently. To guarantee smooth yarn running, the tension control system operates with slip-free yarn feed and just a few deflection points.
/1/ Eric Heymann, Textil-/Bekleidungsindustrie: Innovationen und Internationalisierung als Erfolgsfaktoren (Textile/Clothing Industry: Innovation and Internationalisation as Success Factors), Deutsche Bank Research, 5.07.2011
KARL MAYER
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