Degreasing and decarticulation of machined and turned parts

Qarboon technology is the best alternative to traditional processes that are hazardous to people and the environment for degreasing parts produced by machining, bar turning and additive manufacturing.

Decontaminate, degrease and de-crosslink your machined and turned parts, whether metal or plastic, with a single environmentally-friendly process

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Dry and without water

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Compatible with all metals

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Low electricity consumption

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Compatible with complex parts

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Guaranteed free of cleaning solvent residues for improved surface tension

Dense Fluid Degreasing's supercriticalCO2 cleaning process replaces traditional organic solvent-based treatments, A3 hydrocarbon or modified alcohol-based solvents and washing processes by ensuring the total absence of solvent residues.

Unlike other cleaning processes, the gaseous nature ofCO2 at atmospheric pressure ensures that there are no traces left on the parts being cleaned.

Using carbon dioxide to degrease machined parts also eliminates any risk of solvent retention inside complex parts.

With this process, no drying step is necessary, and once the degreasing cycle is complete, the parts are at room temperature and ready for use.

Cleaning complex parts with an ultra-clean objective

Supercritical CO2 penetrates all the blind holes and cavities in a complex part to degrease both the inside and outside of the part.

It offers a cleaning quality that achieves an ultra-clean level.

It is just as suitable for cleaning medical devices that are difficult to clean using traditional processes, such as injection or suture needles, as it is for machined parts intended for the automotive or aerospace industries, such as valves and hydraulic cylinders.

Ultra-sound and agitation ensure perfect de-crosslinking both inside and outside the parts.

- Work at low temperature
- No drying required
- No risk of material corrosion

Supercritical CO2 is suitable for all types of mechanical and polymer parts

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CO2 is compatible with all types of materials, including aluminium and most polymers.
Its neutrality in relation to materials means that it does not oxidise or attack them during cleaning, degreasing or decarticulation.
Suitable for all types of parts, even those that are particularly difficult to clean, such as complex parts with blind holes or tubes.
Cleaning quality complies with the standards defined in ISO 15001, ISO 13485, etc.

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Choose to improve quality and stability

Adopt an effective solution for degreasing and de-crosslinking your machined parts.

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Dewaxing of parts produced by additive manufacturing using supercritical CO2.      

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Once the parts have been manufactured, whether using metal powder or polymer powder, a cleaning or "de-powdering" operation is compulsory.

‍Inthe case of additive manufacturing of metal parts, the first stage of the part cleaning process will consist of dropping by gravity the majority of the powder that has not been fused.
Carbon dioxide plays a decisive role in the second stage of the de-powdering process. It will be able to penetrate all the cavities and parts of the part to extract and carry away the metal particles that were not fused during manufacture.

Thanks to the properties of supercritical CO2, there is no possibility of carbon dioxide retention or residual traces.

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The range of machines for degreasing departiculating parts

Our machines are designed and built to meet industrial needs. This means that our equipment is optimised in terms of :

1- Ergonomic loading:
Our cleaning chambers are horizontal to facilitate loading and unloading of heavy loads.

2- High production rates:
Our machines are sized to meet your production rates and not the other way around.

3- Production availability:
Our machines require little maintenance (a few hours a month at most) and no recurrent machine stoppages for oil changes, for example, are to be expected.

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Your questions?
Our answers!
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How does supercritical CO2 de-crosslinking work?
In the case of mechanical parts, resulting from bar turning and machining operations, the particles that remain stuck to the surface of the parts are due to residual cutting or machining oils.
Mechanical parts are usually packaged in baskets to facilitate handling. Parts can be placed in bulk or positioned and held according to their degree of fragility.

Once in the autoclave, the baskets of parts undergo an initial degreasing phase. This first stage eliminates the particles from clinging to them and, by gravity, they fall to the bottom of the autoclave.
Coupled with this degreasing action are the complete rotation or oscillation of the baskets and ultrasound. The latter has the effect of setting the particles in motion, including those trapped in the cavities and holes of the parts, so that with the movement, they are evacuated and fall to the bottom of the autoclave.

Supercritical CO2 does not have a high carrying capacity, but depending on the density of the particles extracted, they may be carried to the filter at the autoclave outlet. It is therefore important to adapt the size of the filter to the size of the particles.
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What happens to the materials extracted after degreasing with supercritical CO2?
The CO2 used in our supercritical CO2 degreasing and de-crosslinking machines is originally a fatal waste product generated in many industrial processes. This CO2 is captured, purified and recycled by gas manufacturers such as Air Liquide, Messer, Linde Gaz etc.

‍Duringa degreasing - departiculation cycle for mechanical parts, these are brought into contact with supercritical CO2. This acts as a solvent, solubilising contaminants such as cutting oils and machining oils.
On leaving the autoclave, the supercritical CO2, loaded with pollutants, goes through an initial filtration stage to block the micro-particles transported by the supercritical CO2 flow, before going on to a separation stage. At this stage, consisting of an initial rapid depressurisation phase, the CO2 reverts to a gaseous state and is no longer able to solubilise the pollutants.
The CO2 in its gaseous state is then liquefied and stored in the machine's internal reservoir, ready to circulate again.
The pollutants are collected at the outlet of a gravity or cyclone separator. The extracted materials are chemically pure , with no residual traces of solvents.
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Can supercritical CO2 be reused for subsequent cycles?
The extracted materials and the supercritical CO2 are separated as the supercritical CO2 drops in pressure via an expansion valve. Once the pressure is broken, the supercritical CO2 becomes gaseous and is no longer capable of solubilising anything. In this case, the pollutants pass through a gravity separator and can then be collected.
The supercritical CO2, which is completely free of previously solubilised materials, is recovered, liquefied and stored in the machine's internal tank until it can be circulated again or until the next cycle.
At the end of the cleaning cycle, almost 90% of the CO2 used is collected, liquefied and stored.
As CO2 consumption is optimised, supercritical CO2 technology offers 50% lower operating costs than conventional processes used in the mechanical industry.
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Which pollutants are compatible with supercritical CO2?
Supercritical CO2 degreasing and decrosslinking technology is compatible with most pollutants commonly encountered in the mechanical industry. Supercritical CO2 is compatible with the majority of cutting and machining oils, whether whole or soluble, silicone oils, certain Epoxy-type resins, etc.
‍Assupercritical CO2 is a complex technology, it is important to carry out solubility validation tests on the contaminants to be extracted to confirm their chemical compatibility with supercritical carbon dioxide.

Depending on the type of contaminant, the pressure or temperature parameters are adapted.
Also, to respond to the plurality of pollutants, a virtually infinite number of recipes can be stored in a Dense Fluid Degreasing machine to meet all needs.
Some very specific pollutants may require the use of a co-solvent such as hydrogen peroxide or ethanol.
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