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RF Dryer

RF Dryer

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RF Dryer

  1. 1. RF Dryers in Textiles
  2. 2. Prepared By MD. Golam Kibria Lecturer(Wet Processing) Northern University Bangladesh B.Sc, M.Sc (Textile Engineering, BUTEX) Email:
  3. 3. Content • Introduction • RF Heating • RF Technology • Main Features • Heating/Evaporation process • Advantages • Graphical Comparison • Technical Specification • Main Optional Devices • Applications of RF Dryers • Conclusion
  4. 4. Introduction RF system has capability to accelerate the drying process and shorten production time. RF drying offers High Volume, High speed and High quality drying which is what exactly needed in textile industries. As wet garments of Acrylic, Cotton, Nylon and Polyester blends pass through the drying chamber , the radio waves vibrates the contained water molecules million times per second, vaporizing them. Ventilator Fans are used to remove damp air from the Drying Chamber. The dryer system comprises the 125kW industrial high frequency generator in conjunction with a drying chamber incorporating an electrode applicator and air extraction system. Many types of fibre can be dried. The machine incorporates a modular polypropylene conveyor band and conveyor system. RF drying has a leveling effect that practically eliminates any problems of uneven shrinkage and over drying. The RF drying times depend on the type of fabric, the percentage of moisture in the fabric going in to the dryer, and the degree of dryness desired.
  5. 5. RF Heating A wet product submitted to a radio frequency field, absorbs the electromagnetic energy, so that its internal temperature increases. If a sufficient amount of energy is supplied, the water is converted into steam, which leaves the product; that is to say, the wet product is dried.
  6. 6. Polarization of molecules
  7. 7. RF Heating Equipment
  8. 8. RF Technology This technology is based on the peculiar characteristics of dielectric (insulating) materials such as water. Water molecules are subjected to polarization when put into an electric field, this polarization corresponds to a deformation and re-orientation of the molecules in accordance to the field itself. In an alternated (oscillating) electric field water molecules invert their own polarization at each single inversion of the field. Furthermore, water molecules invert their polarization at the same frequency of that of the field they’re subjected to, dissipating energy due to their inter molecular friction. This energy is said dielectric loss. Inter molecular friction generates heat which increases water’s temperature, discharging steam in the environment. The more frequent are the oscillations, the higher will be the energy absorbed by the material; this is the reason why we use radio frequencies able to allow at least 27 millions inversions per second.
  9. 9. Main Features RF GENERATORS RF generators have been designed and manufactured in order to meet the specific requirements of the textile industries and their humid and dusty environments. The high quality factor (Q) of RF generators (higher than that of traditional generators with concentrated components) ensures higher efficiency, frequency stability (within norm limits) and decreases the level of electromagnetic interference. RF generators are water cooled or air cooled, depending on both their applications and the climatic conditions of the working environment. The available RF power range is set between 05 and 200kW per unit.
  10. 10. Main Features ELECTRODES SYSTEMS it consists on a series of parallel aluminium bars and/or perforated flat plates which receive the radio frequency from the oscillator and transfer it to the load. The electrode is mobile compared to the traditional systems with fixed electrode, which allows more drying flexibility and a higher efficiency in transferring the optimal power to the product to be dried. The regulation of the power is obtained by varying the distance between the two electrodes. For specific applications, such as those where the product to be dried presents fixed dimensional characteristics (for example stripes or fabric), fixed electrode is used.
  11. 11. Main Features SMARTOUCH PANEL Through the use of a PLC combined with SmarTouch panel, one’ll be able to manage the dryer automatically. The device shall automatically set up the optimal power, the speed of the conveyor belt and the distance between the electrodes, ensuring the best control on the final humidity, for a perfectly dried product.
  12. 12. Main Features POWER DENSITY The power density (RF power/electrode area) is an important factor on RF dryers. It is important to set the best power density for each product, in order to deliver the best possible final result and quality. The range of power density (PD) of RF dryers for the textile industry is divided in 3 categories: Very low PD: PD<6kW/m2 Typical applications: acrylic yarns. Low PD: 6kW/m2<PD<10kW/m2 Typical applications: wool yarn cops, most synthetic fibers. Medium PD: 10kW/m2<PD<15kW/m2 Typical applications: viscose and cotton yarns.
  13. 13. Heating/Evaporation process The heating/evaporation process carried out by means of a radio frequency field is: Endogenous: The thermal energy is not supplied to the wet product by an external heat source, but rather it is generated directly throughout its mass. Selective: The electromagnetic energy is absorbed mainly by the moisture and not by the product itself. Controlled: The heating/evaporation rate is directly proportional to the amount of electromagnetic energy supplied, and this energy can be controlled precisely.
  14. 14. Advantages (over conventional dryer) *Faster Drying *Faster Production *Increased Labor Production *Less work in progress *Energy Saving *Less Down Time *Lower Maintenance *Space savings
  15. 15. Graphical Comparison
  16. 16. Technical Specification
  17. 17. Main Optional Devices • SmarTouch panel for fully automatic function • Outlet cooling device • Stabilizer for the triode’s filament or for the complete equipment • PP rigid belt • Lateral teflon protection for the loose fibres • Built-in camera for video inspection • Additional heating device by means of resistors or steam battery
  18. 18. Applications of RF Dryers
  19. 19. Bobbins and Yarn packages RKB RKB has been designed with a precise goal: duplicate the production of a traditional equipment reducing consumption. The technology combines perfectly the radio frequency and the hot air offering a 135% production increase and the best drying for the bobbins. Furthermore, it reduces the processing times considerably, ensures even moisture. • SmarTouch panel • No overheating • Improvement in fixing of the colour • Possibility of using larger bobbins with a high winding density
  20. 20. Bobbins and Yarn packages TDA/TDWA The completely automatic machine for bobbins and yarn packages. Automatically sets the needed power, the speed of the conveyor belt, height of electrode and ensures the best moisture control possible for an excellent output product. And through a SmarTouch panel manage everything in the most simple way. All this with costs reduced up to 50%. • Xdry Technology • Low risk of ignition • No overheating • Improvement in fixing of colour • Possibility of using larger bobbins with a high winding density • Possibility to repeat drying level • Different power potential available
  21. 21. Bobbins and Yarn packages TD/TDW Reduces time processing, cuts costs up to 50%, it ensures even drying and precise, direct control of the final moisture of the product. By means of an excellent design it guarantees a non-stop production with 20% increased output, compared to other machines on the market. • Xdry Technology • Low risk of ignition • No overheating • Improvement in fixing of colour • Possibility of using larger bobbins with a high winding density • Control panel easy to use • Possibility to repeat drying level • Different power potential available
  22. 22. Tops TDWV Designed in order to give the best with each Top. With a low power density, a controlled temperature inside the tunnel and even moisture, it guarantees the best quality for the output product. And with the final conditioning it ensures absence of superficial condensation and matchless drying of the yarn. • Xdry Technology • Low risk of ignition • Better handling • Control panel easy to use • Different power potential available
  23. 23. Smooth Tops TDST Created by combination of radio frequency and hot air it allows the best drying for this type of tops. And with an outlet cooling system and an additional steam battery heating it guarantees a perfect drying. • Xdry Technology • Low risk of ignition • Better handling • Control panel easy to use • Different power potential available
  24. 24. Loose fibres TDLT A must for the drying of fibres. By means of a forced ventilation system with resistors or steam battery, low temperature inside the tunnel and additional outlet cooling system it gives an excellent quality of the fibres. And through the optional additional air aspiration system one can convoy them where necessary. • Xdry Technology • Low risk of ignition • Control panel easy to use • Different power potential available
  25. 25. Hanks TDMNC Especially designed for the best result for Hanks. With a low temperature inside tunnel, an additional air heating system and an outlet cooling system, it ensures the best quality for Hanks after centrifuge or squeezing. And with an optional robotized system one can manage the whole process automatically. Further cut down of production costs. • Xdry Technology • Reduced dimensions • Low risk of ignition • Control panel easy to use • Different power potential available
  26. 26. Fabric - Terry and Carpeting TDF A further step for drying of fabric. With hanging conveyor system and reduced dimensions it ensures a perfect drying of the fabric after hydro extraction. And through a perfect combination between hot air and radio frequency guarantees the best fixing of colour and considerable energy saving. • Xdry Technology • Reduced dimensions • Low risk of ignition
  27. 27. Carpets and Moquette TDC The widest radio frequency dryer in the world. With a width of 4500 mm and an outlet cooling system it supplies the best technology for the drying of moquette and carpets after printing or washing. And with the Xdry technology it guarantees an even moisture and the best final quality. • Xdry Technology • Low risk of ignition • Control panel easy to use
  28. 28. Stockings EBT A new dimension in the drying of stockings after dyeing. With low power density, soft drying, low temperature in the tunnel and an outlet cooling system it guarantees soft, perfectly dried stockings. • Xdry Technology • Optional SmarTouch panel • Low risk of ignition • Different power potential available
  29. 29. Latex TD LAT The drying and the vulcanization of latex at its top level. With an additional air heating system, an outlet cooling system and a width of 2.5 m it guarantees a perfectly dried or vulcanized latex. With the optional double module and the SmarTouch panel it allows to furtherly increase the production and manage the drying automatically. • Xdry Technology • Low risk of ignition
  30. 30. Yarn and stripes TD FIL Pure speed. Used by the best companies of yarns and stripes in the world with a speed till 200 m/minute it allows you the maximum production possible. By means of an exclusive design of electrode it allows to obtain a perfectly dried yarn or stripe. • Xdry Technology • Improvement in fixing of colour • Control panel easy to use
  31. 31. Non Woven TDNW The best technology for non woven. Exclusively designed for non woven it guarantees a perfect drying without yellowing. With 340 kW power, outlet cooling and an unbelievable speed up to 50 m/minute it gives everything for the maximum production. • Xdry Technology • Four radio frequency generators • Low risk of ignition • Product with thickness up to 50 mm
  32. 32. Leather and Skins TDL With 6 power generators, a soft drying and a particularly elaborated drying process it allows to obtain a perfect leather, with the right moisture degree and an incomparable softness. By means of the exclusive double belt system it allows to maintain the exact thickness of the hide. • Xdry Technology • Possibility to repeat drying level • Soft drying • Low power density
  33. 33. Laboratory Dryers TD LAB The high technology in a small size. Developed for working in reduced spaces it allows to have the same quality as bigger equipment but with typical production of a laboratory. With the possibility to choose continues or batch production . • Control panel easy to use • Different power potential available • Can be rent
  34. 34. Conclusion Conventional mode of drying Textiles after they have been dyed is a slow process. Textile industries can increase throughput and fill orders more prominently using Radio Frequency (RF) Dryers. It is used to dry different types of textile form such as bobbins and yarn packages, tops, loose fibres, leather and skins, nonwovens, yarn and stripes, fabrics, carpets, stockings etc. Soft and uniform drying can be achieved by using RF dryers. It ensures better quality, faster drying, energy saving and more production.
  35. 35. Thank You
  36. 36. Any Question ?

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