Compact quattroClean system from acp for dry, residue-free cleaning

Trends such as electromobility, lightweight engineering, miniaturisation and Industry 4.0 have given rise to new challenges in the field of industrial parts cleaning. With its quattroClean system, the advanced clean production GmbH (acp GmbH) offers a solution capable of performing a wide range of cleaning tasks reliably and costeffectively. The dry, residue-free and environmentally-neutral cleaning technology can be adapted to individual requirements. It is highly compact, easy to automate and simple to integrate into production lines, Industry 4.0 manufacturing systems and cleanrooms.

The acp GmbH stands for the development of systems with very high utility value for the chemical-free cleaning of individual components and products. As the clear market leader in Europe, a technological leader and highly innovative, acp makes available environment- friendly CO2 dry cleaning systems to industries.

Whether it is the automotive or supplier industry, precision or micro engineering, medical technology, mechatronics, electronics or other industrial sector, current trends are changing requirements concerning parts cleaning. This also include increasing number of smaller and more complex parts and components, shorter product life cycles, lower product volumes right down to the manufacture of single parts, the use of new materials and material combinations, for example for lightweight engineering applications, and new or modified production processes.

Electromobility, autonomous driving and manufacturing environments designed for Industry 4.0 are further developments which are influencing parts cleaning. There are cases where material combinations or surface structures are unsuitable for wet-chemical cleaning, or only certain areas of components need a specific degree of cleanliness, such as bonding, welding or sealing surfaces, or cleaning steps are performed on assembled components.

Cleaning with CO2 snow

This is where the reliable and cost-effective snow jet technology from acp GmbH comes into its own. The scalable cleaning system can be easily adapted to diverse component geometries to clean selective areas or whole components.

This environmentally-neutral technology uses liquid carbon dioxide as a cleaning medium which, as opposed to dry ice, is gained as a by-product from chemical processes and the generation of energy from biomass. It has an almost indefinite shelf-life and is supplied in cylinders or tanks.

Dry, residue-free cleaning

Liquid CO2 is guided through the non-wearing two-component ring nozzle of the acp system and expands on exiting to form fine CO2 crystals. These are then bundled by a circular jacketed jet of compressed air and accelerated to supersonic speed. The patented technology ensures uniform cleaning results - even on large surfaces where several nozzles are used.

The jet of snow and compressed air has a temperature of minus 78.5°C and can be focused exactly where it is needed. When it impacts on the surface to be cleaned, a combination of thermal, mechanical, sublimation and solvent effects take place. These four cleaning mechanisms enable the quattroClean system to remove filmic contamination, such as residues of cooling lubricants, process oils, polishing pastes, separating agents and silicons, as well as particulate contamination, for example chips, dust and abrasion. Since the cleaning step with the noncombustible, non-corrosive and non-toxic CO2 snow is also gentle on materials, even delicate and finely-structured surfaces can be treated.

The aerodynamic force of the jet transports the detached dirt away. This is then extracted from the cleaning cell together with the sublimated CO2 in a gaseous state. The workpieces are dry on completion of the cleaning process, enabling them to be further processed or packaged straightaway.

Suitable for many products

The quattroClean snow jet technology has proved to be effective in numerous applications in various branches of industry. For example, the cleaning system has been in use for several years now to remove ablation residues from injection-moulded interconnect devices (MIDs) produced by means of laser direct structuring. Compared with common cleaning methods, such as ultrasonic or highpressure washing processes, the quattroClean system has the advantage that the rough laser structures are smoothed at the same time, thus simplifying joining and assembly tasks. Laser residues also need to be removed when manufacturing batteries. Residues from laser processing cells, which could cause shorting, are removed selectively and reliably.

A manufacturer of sensor systems uses the snow jet technology from acp to clean off particles before sensors liable to damage are packaged. For this application, a hermetically-sealed cleaning cell was developed, which is integrated into a clean zone and fitted with a filter fan unit to supply clean air. The quattroClean system is also used in an inline application to clean engine pistons before their surfaces are optically measured.

The parts are cleaned by a robot. The system works in the production system’s one-piece flow and is capable of cleaning 11 cm2/sec. When it comes to die-cutting, an almost manual system removes production residues from strips immediately after cutting. This single-part cleaning step replaces the commonly-used wet-chemical cleaning process.

Compact, easy to control

Thanks to its modular design, the compact quattroClean system from acp is easy to adapt to specific customer requirements. This allows manual, partially-automated and even fully-automated cleaning systems to be developed and integrated into existing production, assembly and packaging lines. Cleaning tests are conducted at the acp technical centre to accurately determine all the process parameters for the application concerned, such as volume flows for compressed air and carbon dioxide, as well as the duration of the jet. Material properties and the type of contamination requiring removal are also accounted for. These parameters can be filed as cleaning programmes in the system control. Depending on the task at hand, systems for cleanroom use can be realized with their own local cleanroom system, including a specially-adapted extraction system.

Partial cleaning

The CO2 snow jet technology selectively dry-cleans specific areas of components without leaving any residue, for example before or after laser-welding processes.

Cleaning MIDs

A jet of CO2 snow removes particles in a dry and gentle process after laser direct structuring MIDs.

Removing ablation residues

Compared with common cleaning methods, such as ultrasonic or high-pressure washing processes, the quattroClean system has the advantage of smoothing rough laser structures at the same time.

The acp process principle

Liquid CO2 is fed through a nonwearing two-component nozzle and expands on exiting to form fine CO2 crystals, which are bundled by a circular jacketed jet of compressed air. This patented technology ensures uniform cleaning results.