Since 2025, there have been several Salmonella epidemics in the UK, with nearly 500 people infected and two people died. The UK Health and Safety Agency (UKHSA) and the Food Standards Agency (FSA) are jointly investigating three gene-related Salmonella enteritidis epidemics. This incident not only sounded the alarm for the global food supply chain, but also highlighted the centrality of hygiene control and equipment design in the food processing process. For food machinery buyers, understanding and implementing higher standards of hygiene design has become a compulsory course to avoid risks and protect brand reputation.
Root of epidemic: risk of cross-contamination in processing
Salmonella is usually transmitted through contaminated raw materials or processing environments. In meat, poultry eggs and ready-to-eat food production lines, if the equipment has clean dead spots, rough welds or poor sealing, it is easy to form biofilms, providing shelter for pathogens. In the UK epidemic, the genetic correlations of multiple independent clusters suggest that there may be common sources of contamination, such as sharing equipment or raw material batches. The hygienic design of food machinery directly determines the efficiency of cleaning and disinfection - components in traditional equipment that are difficult to disassemble, and the accumulation of residual liquid in horizontal pipes can become breeding grounds for bacteria.
International standards such as EHEDG (European Hygienic Engineering Design Group) guidelines clearly require that the equipment should be designed without dead ends, have a surface roughness Ra ≤ 0.8μm, and support in-situ cleaning (CIP). When evaluating equipment, purchasers should prioritize models that meet 3A or EHEDG certification to reduce the probability of cross-contamination at the source.
Technical Highlights: Upgrading Hygienic Design from Materials to Structures
Modern food machinery has shifted from passive cleaning to active defense in response to microbial risks. Key elements include:
- Material selection: Components in contact with food must be made of 304 or 316L stainless steel, which is corrosion-resistant and easy to polish; non-metallic seals must comply with FDA or EU 1935/2004 regulations.
- Structural optimization: The equipment frame should avoid horizontal beams accumulating dust, and the internal pipes should have a slope of ≥3° for easy emptying; all welding points must be continuous and smooth, with no overlapping welds allowed.
- Intelligent monitoring: Integrate temperature, pressure, and cleaning solution concentration sensors to provide real-time feedback on the CIP (Cleaning in Place) effect, ensuring that the sterilization temperature is ≥72℃ and maintained for more than 15 seconds (the standard for pasteurization).
For example, in continuous frying or steaming equipment, adopting a double-helix conveying structure can reduce material retention areas, combined with automatic drainage valves, significantly reducing the risk of microbial growth. These designs not only enhance safety but also reduce manual cleaning time and water consumption.
Application scenarios: Differentiated hygiene strategies for different categories
For different food categories, mechanical hygiene requirements need to be tailored:
- Poultry processing lines: The focus is on carcass washing and cooling, with a recommendation to equip with sodium hypochlorite or ozone water spray systems, with an exposure time of more than 30 seconds, and using air impact drying to reduce surface water activity.
- Ready-to-eat salad production lines: Cutting knives need to be replaced and disinfected every 2 hours, with modular plastic chain plates used for the conveyor belts to support quick disassembly and soaking; the packaging area maintains a positive pressure environment and installs UV sterilization lamps.
- Dryer towers for milk powder:The drying section of the fluidized bed should be equipped with a high-efficiency air filter (H13 grade), and a metal detection and foreign body removal device should be installed at the discharge port to ensure that the microbial index of the final product is lower than 100 CFU/g.
The purchaser shall request the "Hygienic Design Conformity Declaration" from the equipment supplier according to its own product characteristics, and verify the CIP coverage effect on site.
Selection Suggestions: Build a Full Chain Food Safety Defense Line
In the face of increasingly stringent regulations and consumer safety demands, procurement decisions need to go beyond the initial price and focus on full life cycle cost (TCO). The recommendations are as follows:
- Audit and certification:Require suppliers to provide CE, 3A or EHEDG certificates and conduct on-site inspections to ensure that their production facilities comply with GMP standards.
- Verify cleaning efficiency:Perform ATP bioluminescence testing during equipment acceptance to ensure that the RLU value after cleaning is less than or equal to 30 (surface cleanliness standard); at the same time, obtain CIP flow and temperature curve records.
- Reserved extension interface:Select modular equipment for future installation of online microbial testing or steam sterilization modules to adapt to product line upgrades.
For example, our company'sAutomatic continuous sterilizerIt adopts double tank alternating operation, supports multi-stage temperature control at 70-95 ° C, and cooperates with an automatic recording system to meet the traceability requirements of the HACCP system. In addition,Periodically published industry hygiene white papersIt can provide reference for equipment maintenance.
The UK epidemic has once again proved that food safety knows no borders. By investing in machinery with high hygiene standards and strengthening staff training, companies can not only reduce the risk of recalls, but also build a differentiated trust advantage in the market.
summary
From the Salmonella outbreak in the UK to the global supply chain, the hygienic design of food machinery has become the bottom line for the survival of enterprises. Purchasers need to use international standards such as EHEDG as a mirror, combine product characteristics to select verifiable and traceable equipment solutions, and establish a normal microbial monitoring mechanism. Only in this way can we find a balance between efficiency and safety, protect consumers' health and the future of the brand.
