Hygienic conveyor belt design for food processing

Food processing plants need to balance rigorous hygiene requirements alongside the demand for improve productivity, leaving many plant managers unsure of the best investments regarding conveyor systems. 

Conveyor belts in food processing are key focus areas for cleaning as they are often in direct contact with food products. The biggest challenge they face is cross contamination – either physical contamination or microbiological contamination, caused by biofilm build-up on the line. 

Biofilms typically consist of water, lipids, proteins, polysaccharides, and microorganisms and are particularly challenging for food processing sanitation operators to remove. Essentially, biofilm structures create bacterial colonies and single-cell groups that adhere to surfaces. These are preserved by a protective dome of polysaccharide meshing, making them difficult to remove and clean. Therefore, hygienic design features that prevent biofilm build-up from occurring in the first place are crucial for ongoing hygiene in food processing plants.

A critical area for modular belting is the hinges, where, if not properly cleaned, product debris might accumulate and biofilm grows. Therefore, belt design for use in hygienic applications needs to limit the surface area of hinges and provide easy access to belting from all sides, allowing sanitation workers to inspect, clean, and validate belts quickly and effectively. Belts must also facilitate the flow of water and cleaning agents to even the most hidden parts and the rods connecting the belts, so they cannot become breeding grounds for harmful bacteria. 

Overcoming this challenge led to the development of a plastic modular belting range designed to improve cleaning efficiency and food safety. The belt has a completely flat surface, including on the running side, where the hinge and rod area have been minimised. The hinges have been placed on the outer sides of the belt, resulting in a flat bottom surface, which significantly reduces any areas at risk of debris collection and biofilm accumulation. Furthermore, the dynamic open hinge allows water flow to reach the hinges and the rods, facilitating debris removal. 

Independent third-party testing and industrial trials of the belt in the most hygienically demanding applications in poultry, fish, and red meat processing concluded that cleaning operation time and water usage can both be reduced by over 50% because they trap less debris. Further testing, using UV-tracers, found that, after only five rinsing cycles, there was up to 4.1 times less soil residue on the new belt, compared to other commonly used hygienic plastic modular belts. Furthermore, microbiological swab tests and CFU testing showed the belts developed 20 times fewer bacterial colonies compared to commonly used hygienic modular belts.

The next way hygiene of food processing conveyors can be improved is by using modern cleaning in place (CIP) units ? spray cleaning bars fitted to conveyor frames to increase cleaning effectiveness. The functional use of CIPs is clear, they improve cleanability and reduce the time required for cleaning, therefore improving productivity. However, most food conveyor systems are not equipped with CIP units and it is often overly complicated to install them as aftermarket.

This perception is changing thanks to new plug-and-play hygienic CIP units that can be easily installed on any conveyor system. This allows industry to retrofit CIP units onto any system without requiring costly and disruptive engineering work, improving plant-wide cleanability and reducing the cleaning window, improving plant productivity.

Another way to improve hygiene in food processing is by installing components that allow removal of belts from conveyor frames without using tools, such as Saniclip. This facilitates easy cleaning of conveyor frames without requiring specialist engineers, drastically cutting the time required for cleaning and improving productivity.