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Design and optimization of cleaning processes

In cleaning processes there are a multitude of boundary conditions and setting parameters that influence the cleaning result. The aim of the design and optimization of a cleaning process is to ensure the required cleanliness of the cleaned parts in a robust way and at the same time to achieve a high level of efficiency. Parameters such as the available cycle time, the use of resources (energy, chemicals etc.) and the achieved cleaning result are often oppositely dependent. Depending on the process, the focus is on different aspects and they are the aim of an optimization.

Fluorescence measurement

Fluorescence measurement is used to investigate the effect of different cleaning parameters on the cleanliness of parts. The handheld measuring device SITA CleanoSpector is used for the benchmark of different cleaning processes and procedures as well as for the design and optimization of process parameters of one and the same process. Frequent fields of application are the technology center of chemical and cleaning plant manufacturers; whether it is the design and optimization of an aqueous cleaning, a solvent cleaning or a selective cleaning by laser, plasma or CO2 snow blasting.

Optimization of CO2- snow jet cleaning

In the following example, the fluorescence measurement is used to set the optimum process parameters for CO2 snow jet cleaning during process design. The aim is to achieve an optimal cleaning result with minimum cycle time.

In order to investigate the influence on the cleaning effect, different parameters such as distance to the surface, travel speed and pressure of the CO2 snow jet cleaning were varied and the cleaning effect was tested by checking the cleanliness using fluorescence measurement. The use of a smaller capillary or half the pressure did not lead to an improvement of the cleaning effect compared to the standard parameters.

 

By using twice the speed, the cycle time could be reduced, but at the expense of the cleaning effect. Doubling the distance to the surface improved the result and achieved more than twice as good cleaning results as using the standard parameters with the same cleaning time. This impressively demonstrates the possibilities of fluorescence measurement for process design and optimization of cleaning processes.


Ergebnisse der Fluoreszenzmessung der ungereinigten und mit verschiedenen Parametern gereinigten Teile

The hand-held measuring device SITA CleanoSpector is highly suited for cleanliness inspection of parts to assure product quality as well as follow-up processes such as adhesive bonding, coating, welding, hardening and bonding.

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SITA CleanoSpector.


 

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