Anforderungen an Werkstoffe und Werkstoffoberflächen bezüglich Reinigbarkeit und Beständigkeit

Bobe, Ulrich; Wildbrett, G.

doi:10.1002/cite.200600095

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…The maximum roughness (Rmax) and the averaged roughness depth (RZ/DIN) include the maximum and mean peak-to-valley height within surfaces and thus can be more appropriate indicators for the cleanability performance of surfaces (Frank and Chmielewski 2001 ). In addition, these maximum roughness limits can differentiate desired roughness from unintentional surface scratches, which can also affect the cleanability rate of used equipment (Bobe and Wildbrett 2006 ). Defects and scratches, which occur inevitably during the lifetime of food contact surfaces, can change the average roughness as well as affect the cleanability and the hygienic status (Frank and Chmielewski 2001 ).…”

Section: Discussionmentioning

confidence: 99%

Microbial investigation of cleanability of different plastic and metal surfaces used by the food industry

et al. 2023

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Different conveyor belt materials used by the meat and other food industries were compared, regarding their cleanability as bacterial reduction rates in relation to their surface topography. Eleven thermoplastic polymers, four stainless steels, and five aluminized nanostructured surfaces were investigated under laboratory conditions. Cleanings were conducted with water only, and with an alkaline foam detergent. Overall, scanning electron microscopy revealed remarkable differences in the surface topography of the tested surfaces. Water cleaning results showed that nanostructured aluminized surfaces achieved significantly higher cleanability rates compared to the eight thermoplastic surfaces, as well as the glass-bead blasted rough stainless steel. Thermoplastic surfaces showed overall low cleanability rates when cleaned with alkaline detergent, while stainless steel and nanoporous aluminum showed high variations. Overall, nanoporous aluminum showed promising results as it can be used to coat conveyor belts. However, compatibility with cleaning detergent and sensitivity to scratches must be further investigated. Overall, it can be concluded that cleanability is not only influenced by surface roughness, but also by the overall surface finish, scratches, and defects.

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Section: Discussionmentioning

confidence: 99%

Microbial investigation of cleanability of different plastic and metal surfaces used by the food industry

et al. 2023

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“…A considerable amount of work has been done on characterizing the influence of different types of soil materials on the cleanability of solid surfaces, e.g., in production plants or the food service industry [51][52][53][54][55][56].…”

Section: Cleaning Versus Emptyingmentioning

confidence: 99%

The Emptying Behaviour of Highly Viscous Liquids. Part II: Development of Test Methods and Evaluation of Untreated and Coated Films

Loibl

Schmidt

Auer-Seidl

et al. 2012

Journal of Adhesion Science and Technology

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Liquid food products stick to solid surfaces. This problem occurs in all supply chain steps from production to recycling. Although the basic problem has been known for a long time, the parameters influencing the interfacial adhesion have not been clarified yet. Here, two methods (product depletion test and tack test) to evaluate the adhesion of highly viscous liquids to solid surfaces have been developed. The product depletion test allows the assessment of the residue amounts and covered surface areas during the gravity-driven flow on an inclined plane. The tack test is conducted by filling the gap between two parallelly mounted, horizontally oriented plates with a liquid product and measuring the normal force while separating the plates by pulling off the upper plate under defined conditions. The influence of the experimental parameters on the maximum normal force (F max ) could be shown. While the correlation between the pull off velocity of the upper plate and F max follows a power law, the dependency between the gap size and F max follows an exponential function. Although no significant correlation between F max or the work of adhesion (W a ) and the solid's properties could be identified, a correlation between F max and W a was observed. As shown by product depletion with ketchup, although the surface coverage is only slightly influenced by the packaging material, the opposite is the case for the covered surface area which, therefore, determines the residue amounts. For some coated samples a large residue reduction was observed.

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“…Die Maschinenrichtlinie fordert eine glatte Oberfläche [3]. Da der Ra-Wert die Oberfläche nur unzureichend charakterisiert, wurde ein Projekt gestartet, Oberflächen mit verschiedenen Topographien zu untersuchen (s. U. Bobe, G. Wildbrett [24], diese Ausgabe). Die EHEDG fordert u. a. in ihren grundlegenden Kriterien für Hygienic Design eine Oberflächenrauheit von maximal Ra = 0,8 lm.…”

Section: Neben Der Richtigenunclassified

Hygienic Design von Anlagen und deren Qualifizierungsmethoden

Hofmann

Sommer

2006

Chemie Ingenieur Technik

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Die Vermeidung von Lebensmittelkontaminationen und die Erhöhung der Produktsicherheit ist das Ziel eines jeden Lebensmittelproduzenten. Mit der reinigungsfreundlichen Gestaltung von Bauteilen und Anlagen für die Lebensmittelherstellung befasst sich das Hygienic Design. Es definiert grundlegende Anforderungen an die Auswahl von Werkstoffen und deren Oberflächenqualitäten. Wichtige Gestaltungskriterien müssen eingehalten werden, damit eine vollständige, sichere und reproduzierbare Reinigung der Anlagen ermöglicht wird. Nur so kann die Gefahr einer Produktkontamination vermieden werden. Damit stellt dieses Themengebiet ein wichtiges Glied in der Kette aller Einflussfaktoren hinsichtlich der Produktqualität dar. Dieser Beitrag soll dazu beitragen, die Grundzüge der reinigungsgerechten Konstruktion von Komponenten und Anlagen besser verstehen zu können und über verschiedene Qualifizierungsmethoden aufklären.

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Anforderungen an Werkstoffe und Werkstoffoberflächen bezüglich Reinigbarkeit und Beständigkeit

Cited by 12 publications

References 11 publications

Microbial investigation of cleanability of different plastic and metal surfaces used by the food industry

Microbial investigation of cleanability of different plastic and metal surfaces used by the food industry

The Emptying Behaviour of Highly Viscous Liquids. Part II: Development of Test Methods and Evaluation of Untreated and Coated Films

Hygienic Design von Anlagen und deren Qualifizierungsmethoden

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