ASCOJET US

ASCOJET US

Dry Ice Blasting

ASCOJET - the Dry Ice Blasting Technology

ASCOJET Dry Ice Blasting is a powerful, gentle, dry and ecologically friendly cleaning method applied in many industries. The following describes how this unique cleaning method works, what its advantages are, where it is applied and what makes the ASCOJET Dry Ice Blasting technology so special.

What is CO2?

Carbon dioxide or CO2 is an odourless, inert gas approximately 1½ times heavier than air and 0.03 % is normally present in the earth's atmosphere. It is also found in great quantities in volcanoes, earth cracks, other sources and in the metabolism of plants, animals, and human beings.

Commercially, CO2 can be recovered as a by-product from various chemical industries and is usually stored in a tank after recovery. Carbon dioxide can exist in three forms: 

- in gaseous form

(for the beverage and food industries)

- in liquid form         

(in a storage tank under pressure)

- in solid form

(called dry ice, for blasting, cooling etc.)

What is dry ice?

Dry ice pellets with a diameter of 3 mm

Dry ice is produced from liquid carbon dioxide. 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.

How does dry ice clean?

The ASCOJET 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/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. 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 Mohs, the cleaning is virtually non-abrasive, and the surface quality is maintained.

The thermo shock

As a result of the sudden and intense temperature shock on the surface, the coating or impurity contracts.

 

The cracking

As a result of the contraction the coating cracks and the material becomes brittle due to the cold.

The cleaning

The dry ice pellets hit the surface with great speed and remove the detached coating and clean the surface material.

Where can ASCOJET Dry Ice Blasting be applied?

Cleaning of core boxes

Dry ice blasting basically removes all material which reacts strongly to differences in temperature. Paint, varnish, adhesive, oil, wax, residues in bakeries, bitumen, synthetic residues and foams (e.g. PU) etc. are removed easily without damaging or altering the surface. Even delicate parts like switch boards and other electric components can be cleaned gently. As ASCOJET dry ice basting is virtually non-abrasive, this technology is especially highly recommended for gentle and effective cleaning of moulds of any type and material in all industries (e.g. ingot moulds, core boxes, injection moulds, high pressure die casting moulds, moulds for PU-products, waffle irons etc.).

 

Click here to find a list and pictures of possible applications.

Advantages over other cleaning methods

Gentle
ASCOJET Dry Ice Blasting is virtually non-abrasive. This means that in comparison to traditional blasting methods with sand or glass beads, the cleaned surfaces are not damaged or altered. So for example the edges of ingots moulds (especially in closing areas) will not be rounded out. Any arising of fins will therefore be avoided.

No dismantling
ASCOJET Dry Ice Blasting has the advantage that it can be applied directly to the moulds/plants without disassembling them. This saves you valuable time. Even hot moulds such as ingot moulds in foundries can be cleaned on-line. ASCOJET dry ice blasting has minimal effect on mould temperature allowing virtually continuous production. This way ASCOJET Dry Ice Blasting can easily be applied regularly and integrated in the daily working process, thus supporting quality assurance and process reliability.

Dry
ASCOJET Dry Ice Blasting is a dry cleaning method. Therefore even delicate parts like switch boards and other electric components can be cleaned gently. Also in other industries where moisture would lead to problems (e.g. food industry) this cleaning method is applied regularly.

No residual blasting media 
ASCOJET
Dry Ice Blasting leaves no residual blasting media behind because the dry ice pellets sublimate immediately after impact on the surface. Therefore the time and costs associated with disposal of blasting media are eliminated.

Ecologically friendly
ASCOJET Dry Ice Blasting is ecologically friendly. As mentioned, no residual blasting media has to be disposed of and no solvents or chemicals are needed.
CO2 is gained as a by-product of other production processes (for example from the production of ammonia or from combustion processes). In all industrial countries CO2 is not produced separately and the combustion of fossil fuels in order to produce CO2 only has disappeared completely.

ASCOJET: More than just a Cleaning Method

Questions?

Do you have questions regarding the ASCOJET Dry Ice Blasting Technology? Please contact us.

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