Infrared Paper Coating & Drying Machine
processes have proved its importance in today's time where the paper
industry has undergone tremendous change and conventional drying method is
replaced by high intensity electrical infrared drying and coating. Here, in
this working situation, high intensity infrared drying allows evaporation of
eight to ten times more water than conventional drying method per square
meter which provides for improved quality, fast immobilization, space saving
as well as simplified sheet runs. Functioning as highly penetrating energy
that has much higher drying rate in comparison to convection or conduction
systems, some of the advantages of using this technology in paper coating
and drying applications include providing quality surface coating from quick
coating immobilization, allowing negative reduction of scale on initial
dryers, allowing simplified sheet movement because of compact infrared
dryer, providing for improved porosity, allowing for lower coat weight and
more synthetic on the surface coating as well as bringing decrease in
restoration time from sheet breaks or stops.
What is Infrared?
Infrared as a technology has gained high importance in the current
day functioning of appliances especially in the field of paper industry
involving application of paper coating and drying. Here, the high intensity
infrared drying allows evaporation that is eight to ten times more than
conventional drying method which provides for fast immobilization, space
saving and simplified sheet run. In terms of working, infrared functions as
electromagnetic energy which falls between ultraviolet as well as microwave
energy in spectrum where the heating effectiveness is governed through
emitter emissivity, paper emissivity, emitter temperature and emitter
surface area. As highly penetrating energy, it has much higher drying rates
in comparison to convection (Hot air dryer) or conduction (Steam cylinders)
systems.
Advantages of Infrared drying
Advantages of Infrared drying allows better heating effectiveness
which is governed by emitter emissivity, emitter temperature, paper
emissivity and emitter surface area. Here, the highly penetrating energy
provides advantage of much higher drying rates in comparison to convection
(Hot air dryer) or conduction (Steam cylinders) systems. Further, the other
advantages include providing quality surface coating from quick coating
immobilization, allowing negative reduction of scale on initial dryers,
allowing simplified sheet movement because of compact infrared dryer,
providing for improved porosity, allowing better coverage or less fiber
swelling and show through. Some other benefits include allowing for lower
coat weight and more synthetic on surface coating, decreasing restoration
time from sheet breaks or stops, allowing more control over process due to
fine tuning ability and limiting possibility of web damages during emergency
stop due to instant cooling down ability.
Dynamics of Drying
Dynamics of Drying is based on high-intensity IR systems that are
built on working mechanism of HI -IR Drying system which on the coated sheet
is different from conventional energy source like Hot Air Dryers or Steam
Cylinders. Further, the intense penetrating capability that results from
high intensity as well as short wave length also helps in removing negative
temperature gradient in sheet as high percentage of infrared passes through
it. Further, the infrared energy penetrates sheet along with radiant heat
transfer where the energy on hitting sheet is either absorbed or gets
reflected back on interaction with each particle of coating/sheet. This
uniform heating is highly important from point of view of quality and
process efficiency where IR drying leads to rapid drying of coating color to
immobilization point, thus resulting in predictably uniform coating surface
with typically excellent printing characteristics.
IR dryer
IR dryer offered come with salient features involving approval by
various prestigious installations throughout India with indigenously
designed finish so as to meet world standards. Here, world class, reputed
quality infrared emitters are used that feature steel construction with high
intensity of IR radiation up to 600 KW / m2. These also feature gold or
white coated reflectors with quartz built sheet cover that is transparent to
infrared radiation, thus protecting emitters from splashes as well as making
it easily cleanable. The air cooling also helps in enhancing life of the
component with presence of air impingement and exhaust of vapors providing
for increased process efficiency. The dryer also comes with immediate 'on'
and 'off' switching of emitters or Thyristorised (SCR) power regulator so as
to provide for step less power variation with provision of automatic safety
interlocks against breakage in web, machine stoppage, blower failure. The
dryer system is also backed with readily available spares so as to provide
uninterrupted functioning at customer’s end.
Specifications :
- Mechanism : HI - IR Drying system
