Cryogenics takes place in a well thought out policy for ecofriendly and better efficiency cleaning and surface preparation solutions
Cryogenics has a long experience in the field of surface activities for general industry, foundries, food-industry, automotive, petrochemical, aerospace…
Cleaning process is produced with dry ice blasting technology which is proven to be unbelievably faster and more effective than traditional industrial blasting methods, when combined with our hydrophobic coating.
How it works:
Dry ice is produced from liquid carbon dioxide (CO2). Inside a dry ice pelletizer, the liquid carbon dioxide is expanded under controlled conditions to form dry ice snow. This snow is then pressed through an extruder plate into round, hard pellets (elongated grains with a diameter of 3 mm or 1.7 mm according to the used extruder plate) for dry ice blasting purposes or into larger pellets/dry ice slices/blocks for cooling purposes. Dry ice has a temperature of approx. -79 °C.
The Dry Ice Blasting machine accelerates with compressed air the dry ice pellets to a speed of approx. 300 m/s.
The pellets hit the object to be cleaned. The surface is shock-frozen in a fraction of a second. Due to the sudden thermo-shock generated on the surface to be cleaned, the coating or the dirt contracts, becomes brittle and cracks.
Due to the cracking of the surface, the pellets can reach under the dirt and remove it.
The additional kinetic energy removes the coating/dirt from the surface. Immediately after impact, the pellet sublimates and goes back to atmosphere as a pure gas (CO2) without leaving any moisture behind.
On impact the pellets vaporize to carbon dioxide gas and increase in volume by a factor of 700. Due to this expansion the contaminant is lifted and separated from the base material
The only thing left is the coating/dirt removed from the surface and no blasting media has to be disposed of.
Since the hardness of the pellets is only approx. 2 on the Mohs scale, the cleaning is virtually non-abrasive, and the surface quality is maintained.
First step: The thermo-shock
As a result of the sudden and intense temperature shock on the surface, the coating or impurity contracts.
Second step: The cracking
As a result of the contraction the coating cracks and the material becomes brittle due to the cold.
Third step: The cleaning
The dry ice pellets hit the surface and remove the detached coating and clean the surface material.
In these interfaces conditions between coated metallic substrate and layers of overspray of paint, Dry ice blasting basically provide easy and incredibly fast remove of all type of paint (powder, liquid, cataphoretic) which reacts strongly to differences in temperature and with the hydrophobic surface of the Jig.
Paint, varnish, adhesive, oil, wax, residues in bakeries, bitumen, synthetic residues and foams etc. are removed easily and quickly without altering the substrate.
This technology is also especially highly recommended for gentle and effective cleaning of molds of any type and material in all industries (e.g. ingot molds, core boxes, injection molds, high pressure die casting molds, molds for PU-products, waffle irons and more).
KEY ADVANTAGES OF DRY ICE BLASTING
- Ecologically friendly and gentle thanks to a dry cleaning method which leaves no residual blasting media behind because the dry ice pellets sublimate immediately after impact on the surface
- No needs of dismantling jigs, molds, equipments… can easily be applied regularly and integrated in the daily working process, thus supporting the Lean philosophy and process reliability.
- Eligibility to automation and integration in the global in “In-Line” process