2. Prepared By
MD. Golam Kibria
Lecturer(Wet Processing)
Northern University Bangladesh
B.Sc, M.Sc (Textile Engineering, BUTEX)
Email: kibria.but@gmail.com
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. 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.
6. 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.
9. 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.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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.
15. Advantages (over conventional dryer)
*Faster Drying
*Faster Production
*Increased Labor Production
*Less work in progress
*Energy Saving
*Less Down Time
*Lower Maintenance
*Space savings
18. 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
20. 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
21. 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
22. 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
23. 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
24. 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
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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
31. 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
32. 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
33. 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
34. 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
35. 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.
