MANUAL for KG30 - KG50 SUpreMe
DRY ICE BLASTING EQUIPMENT FROM ICETECH | PAGE 2
“ Dry ice pellets sublimates immediately
on striking the object. ”
This change from a solid to a gaseous form, the
accompanying tremendous expansion in volume,
the high kinetic energy and the low temperatures
are the most important factors which result in the
loosening of impurities.
Method
The dry ice blasting machine contains a dry ice pellet
tank and a dosing unit, which doses the dry ice pellets
into the jet of compressed air. By means of the com-
pressed air, the dry ice is transported through a special
blasting hose to the blasting gun and nozzle.
In the blasting gun, the air stream is accelerated, and
the dry ice pellets leave the nozzle of the blasting gun
at very high velocity.
Cleaning Effect
The cleaning effect of dry ice blasting is based on
three principles:
• Thermal Effect:
The dry ice pellets have a temperature of
-79°C/-110°F, and impurities are therefore
cooled down drastically; the impurities shrink
and loosen due to different thermal expansion
coefcients.
• Kinetic Effect:
When the dry ice pellets leave the blasting gun
nozzle they have high kinetic energy and strike
the impurities at a speed almost equivalent to
the velocity of sound.
• Sublimation Effect / Volume Expansion:
The dry ice pellets are being pressed into the
brittle impurities and sublimate immediately on
contact. The resulting volume increase by a
factor of approx. 700 contributes to tearing
away deposited dirt.
In some cases the thermal effect will be the most
signicantfactor,inothercasesthekineticeffect
willbethemostsignicantfactor.
GENERAL INFORMATION
The dry ice blasting machine and its accessories
have been developed with the aim of supplying
cleaning equipment which minimizes consequential
cleaning costs and combines the best characteristics
of sand blasting and steam cleaning.
Dry AND Thermal Cleaning Process
Dry ice blasting provides a dry cleaning process
(familiar in sand blasting), AND a thermal cleaning
process (familiar in steam cleaning).
The blasting media itself (dry ice pellets) subli-
mates; this means that in most cases the process
can be used for cleaning components, machinery
and plant equipment without dismantling and often
without having to cover adjacent plant equipment.
No Residual Blasting Media
Dry ice blasting provides a dry and gentle, but
extremelyefcient,cleaningprocessthatleavesno
residual blasting media to be disposed of, and no
undesired substances that might penetrate into or
be deposited on machines and plant components.
This means that cleaning by dry ice blasting
becomes an excellent alternative to cleaning with
traditional methods.
DRY ICE BLASTING – How It Operates
Dry Ice Pellets
The dry ice blasting machine uses small CO
2
”par-
ticles” as the blasting medium, called dry ice pellets
(CO
2
– the chemical symbol for carbon dioxide).
In a machine commonly known as a pelletizer, liquid
CO
2
is used to produce hard and uniform dry ice pellets.
The pellets are approx. 3 mm (0.1 inch) in diameter
and approx. 10 mm (0.4 inch) in length – or rice-sized.
These dry ice pellets have a temperature of -79°C/
-110°F. When used for dry ice blasting, the pellets
are blasted onto the object to be cleaned at a very
high velocity. On contact with the surface of the
object, they immediately change from a solid to a
gaseous form as they heat up on impact.
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