Hygienic Conveying

How to Convey Hygienic Sensitive Bulk materials

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When the applicable cleaning process has been defined, the necessary design can be determined with the aid of the EHEDG guidelines. The design can be officially tested by a construction appraisal or test (for automatic wet cleaning) by the testing and certification institutes of the EHEDG and its suitability confirmed with a certificate. Certificates are currently available for closed and open-circuit processes, for dry or wet cleaning in manual or automatic cleaning modes.

There are currently three conventional cleaning methods for dry food processing systems:

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  • Dry cleaning: Normally manual cleaning by vacuuming, dry brushing or wiping, sometimes also blowing off or out. Components are opened or dismantled for cleaning. During dry cleaning it is not possible to achieve completely residue–free cleaning results — slight layers of dust remain. A great advantage of dry cleaning is that the entire system is kept dry and that microbial contamination cannot occur. Obviously the exterior must also be kept dry, especially when the components are opened. As cleaning is carried out manually, it is always necessary to check the cleaning results and correct any oversights.
  • Manual wet cleaning (COP) by washing, spraying or wiping with cleaning solutions (acidic, alkaline), rinsing with water and subsequent drying. Some stages can be automated. Residue-free cleaning can be achieved without any problems with this method. Special care must also be taken to ensure that no contaminants are brought into the open components from the outside. As this is a manual cleaning method, inspection of the cleaning results is essential after cleaning and drying.
  • Automatic wet cleaning (CIP) by purging with cleaning solutions (acidic, alkaline), as well as rinsing water and subsequent drying. Components are not dismantled or opened. Clearly defined separating points (supply and discharge points) are essential. Automatic wet cleaning must be determined separately for each product and system. This cleaning procedure must then be validated. In addition to the low time and personnel requirements for automatic cleaning, the consistency of the cleaning results is ensured, as the human factor can be almost completely excluded.

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