What advantages do smooth surfaces and a dead-space-free design offer for hygiene in milk powder plants?
Smooth surfaces and a dead-space-free design are central elements of hygienic design in milk powder plants. They directly influence product safety, cleaning efficiency and the microbiological stability of the entire process.
Advantages of smooth surfaces
Minimised adhesion of product residues
Low surface roughness reduces mechanical anchoring points for milk powder particles as well as fat and protein deposits and facilitates their removal during cleaning.
Reduced biofilm formation
Polished, defect-free and continuous surfaces offer microorganisms considerably fewer points of adhesion. This lowers the risk of microbiological contamination and biofilm formation.
Increased cleaning efficiency
Smooth surfaces allow uniform wetting and defined flow profiles of the cleaning media. Mechanical, chemical and thermal cleaning effects can thereby act optimally, which reduces cleaning times, water consumption and downtime.
Improved inspectability and validatability
Deposits, incipient corrosion or surface defects are easier to detect on smooth, uniform surfaces. This facilitates the validation of cleaning and the documentation within HACCP and audit systems.
Higher corrosion resistance
High-alloy, cleanly executed and passivated stainless steels form a stable protective layer. This reduces the risk of corrosion and the associated hygiene risks.
Advantages of a dead-space-free design
Avoiding product stagnation and deposits
Dead spaces such as acute angles, deep bores, threads in the product space, valve niches or sensor connections promote product retention, powder deposits and local accumulation of moisture. A dead-space-free design with large radii and flow-optimised transitions prevents such zones of stagnation.
Microbiological safety in the dry area
Hygroscopic milk powder residues in areas that are difficult to access attract moisture, form lumps and can lead to microbiological risks. Dead-space-free designs minimise these sources of hazard.
Complete cleanability and drainability
Flow-favourable geometries ensure that cleaning media reach all product-contact surfaces well. In combination with self-draining pipework, residual moisture is avoided, which with milk powder can lead to encrustation and contamination.
Homogeneous flow conditions in CIP systems
Avoiding dead zones promotes uniform cleaning even in complex plant sections such as mixers, dryers or conveying lines.
Reduced risk of cross-contamination
Without dead spaces in which product residues remain, the risk of allergen carry-over between batches falls. At the same time, safe operating periods between cleaning cycles can be extended.
Significance for standards and food safety
The combination of smooth, well-passivated surfaces, dead-space-free geometry and consistent self-drainability forms the design basis for complying with recognised hygiene standards such as EHEDG and 3-A Sanitary Standards as well as the requirements of HACCP, FSSC 22000 and IFS. It ensures that all product-contact surfaces can be cleaned, dried and inspected reliably.
How amixon® implements dead-space-free construction and hygienic design
Freedom from dead space as a design principle
In amixon® precision mixers such as VM, HM, AM, AMT, the KoneSlid® mixer KS, SpherHelics® SH and the Gyraton® silo mixer, the mixing chamber and mixing tool are welded free of crevices and ground smooth. In the product-contact area there are no gaps, screwed joints or capillary crevices. The mixing tool is supported and driven exclusively from above, so that the lower shaft passage, classically critical for contamination, is eliminated entirely.
The standard connection with a discharge flap closes flush and free of dead space with the inner wall of the mixing chamber; dead-space-free ball segment fittings are available as an alternative. The large inspection doors are manufactured by the Clever-Cut® process and seal permanently free of dead space with the OmgaSeal® door seal – vacuum-tight or against overpressure on request.
Cleaning: wet and dry, validatable
Integrated washing lances and freely programmable target-jet cleaning nozzles allow defined, reproducible CIP and WIP cycles; this reduces the cleaning effort and markedly lowers the consumption of wash water. The SinConcave®/SinConvex® mixing helix system supports the complete drainage of product and cleaning medium. The mixers comply with the EHEDG guidelines expressly for dry and wet cleaning regimes, so that switching between dry and wet cleaning is provided for by design.
The Clever-Cut® doors provide complete, ergonomic access to all product-contact surfaces. This is the basis for visual cleaning inspection and for sampling by swab or rinse.
Certified standards
On request, amixon® mixers meet the EHEDG guidelines, the FDA hygiene guidelines, the design rules of the 3-A Sanitary Standards and GMP requirements. VM and HM can be used in FDA-compliant form as sterile mixers and reactors. With free-flowing materials, ComDisc® residual discharge can reach 99.997 % and better and minimises residues as well as cross-contamination risks during formulation changes.
In dairy and infant formula production, amixon® mixers are in use worldwide at manufacturers and contract manufacturers. Vitamins, minerals, trace elements, encapsulated omega-3 fatty acids and probiotics can be mixed in homogeneously and gently after the spray tower, without destroying agglomerates.
Manufacture in Paderborn as the quality foundation
amixon® develops and manufactures exclusively at the Paderborn works with the greatest depth of manufacture and uses components from Germany exclusively. As a certified welding company with European, Japanese, Korean and American qualifications, amixon® designs every apparatus as a one-off on the basis of the operator's URS. Quality control remains entirely in-house without gaps, and every specification is verifiable down to component level. This manufacturing autonomy also secures long-term supply: every component can still be re-manufactured reproducibly decades later.
Verification in the amixon® pilot plant
Whether the specific formulation delivers the expected results is verified by amixon® in advance at the pilot plant with 35 test units under real conditions. The trials are carried out, evaluated and documented jointly and form a robust basis for decision-making before the investment.