An ultrasonic washing system and its applicability in cleaning of returnable plastic crates

Irma Klemetti, Mari Arpiainen, Satu Salo, Gun Wirtanen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

The hygiene of equipment surfaces plays an important role in dairy manufacture. Especially the environment in which products are packed can easily get contaminated. Returnable transport packages or crates can be one source of contamination. The cleaning of these packages is often incomplete and pathogens and spoilage organisms attached to surfaces can easily survive through the washing process. Hygiene of returnable plastic crates cleaned in washing tunnel was determined in Valio Ltd. Herajoki plant. The cleaning parameters and the microbiological quality of washing liquid were monitored. Using artificially soiled crate pieces were performed the pilot-scale studies with ultrasonic washing system. Design of Experiment (DOE, Taguchi method) was used to optimise the cleaning procedure. According to the results the bottom parts of the crates were the dirtiest parts with the worst cleaning results. Temperature, duration of washing and washing liquid quality varied much in the washing tunnel. Pilot tests showed that the sodium hydroxide (NaOH) containing EDTA was the most efficient detergent in the ultrasonic washing system. The cleaning time of 100 s and the 5 % concentration of washing liquid gave the best cleaning effects. The ultrasonic cleaning method is applicable for cleaning of returnable plastic crates and it stands comparison with the washing tunnel method.
Original languageEnglish
Title of host publication34th R3-Nordic Contamination Control Symposium
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages37-43
ISBN (Electronic)951-38-6285-2
ISBN (Print)951-38-6284-4
Publication statusPublished - 2003
MoE publication typeB3 Non-refereed article in conference proceedings
Event34th R3-Nordic Contamination Control Symposium - Turku, Finland
Duration: 2 Jun 20034 Jun 2003

Publication series

NameVTT Symposium
PublisherVTT
Number229
ISSN (Print)0357-9387
ISSN (Electronic)1455-0873

Conference

Conference34th R3-Nordic Contamination Control Symposium
CountryFinland
CityTurku
Period2/06/034/06/03

Fingerprint

crates
cleaning
washing
ultrasonics
plastics
hygiene
liquids
sodium hydroxide
microbiological quality
spoilage
detergents
dairies
manufacturing
experimental design

Cite this

Klemetti, I., Arpiainen, M., Salo, S., & Wirtanen, G. (2003). An ultrasonic washing system and its applicability in cleaning of returnable plastic crates. In 34th R3-Nordic Contamination Control Symposium (pp. 37-43). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 229
Klemetti, Irma ; Arpiainen, Mari ; Salo, Satu ; Wirtanen, Gun. / An ultrasonic washing system and its applicability in cleaning of returnable plastic crates. 34th R3-Nordic Contamination Control Symposium. Espoo : VTT Technical Research Centre of Finland, 2003. pp. 37-43 (VTT Symposium; No. 229).
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abstract = "The hygiene of equipment surfaces plays an important role in dairy manufacture. Especially the environment in which products are packed can easily get contaminated. Returnable transport packages or crates can be one source of contamination. The cleaning of these packages is often incomplete and pathogens and spoilage organisms attached to surfaces can easily survive through the washing process. Hygiene of returnable plastic crates cleaned in washing tunnel was determined in Valio Ltd. Herajoki plant. The cleaning parameters and the microbiological quality of washing liquid were monitored. Using artificially soiled crate pieces were performed the pilot-scale studies with ultrasonic washing system. Design of Experiment (DOE, Taguchi method) was used to optimise the cleaning procedure. According to the results the bottom parts of the crates were the dirtiest parts with the worst cleaning results. Temperature, duration of washing and washing liquid quality varied much in the washing tunnel. Pilot tests showed that the sodium hydroxide (NaOH) containing EDTA was the most efficient detergent in the ultrasonic washing system. The cleaning time of 100 s and the 5 {\%} concentration of washing liquid gave the best cleaning effects. The ultrasonic cleaning method is applicable for cleaning of returnable plastic crates and it stands comparison with the washing tunnel method.",
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Klemetti, I, Arpiainen, M, Salo, S & Wirtanen, G 2003, An ultrasonic washing system and its applicability in cleaning of returnable plastic crates. in 34th R3-Nordic Contamination Control Symposium. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 229, pp. 37-43, 34th R3-Nordic Contamination Control Symposium, Turku, Finland, 2/06/03.

An ultrasonic washing system and its applicability in cleaning of returnable plastic crates. / Klemetti, Irma; Arpiainen, Mari; Salo, Satu; Wirtanen, Gun.

34th R3-Nordic Contamination Control Symposium. Espoo : VTT Technical Research Centre of Finland, 2003. p. 37-43 (VTT Symposium; No. 229).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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T1 - An ultrasonic washing system and its applicability in cleaning of returnable plastic crates

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N2 - The hygiene of equipment surfaces plays an important role in dairy manufacture. Especially the environment in which products are packed can easily get contaminated. Returnable transport packages or crates can be one source of contamination. The cleaning of these packages is often incomplete and pathogens and spoilage organisms attached to surfaces can easily survive through the washing process. Hygiene of returnable plastic crates cleaned in washing tunnel was determined in Valio Ltd. Herajoki plant. The cleaning parameters and the microbiological quality of washing liquid were monitored. Using artificially soiled crate pieces were performed the pilot-scale studies with ultrasonic washing system. Design of Experiment (DOE, Taguchi method) was used to optimise the cleaning procedure. According to the results the bottom parts of the crates were the dirtiest parts with the worst cleaning results. Temperature, duration of washing and washing liquid quality varied much in the washing tunnel. Pilot tests showed that the sodium hydroxide (NaOH) containing EDTA was the most efficient detergent in the ultrasonic washing system. The cleaning time of 100 s and the 5 % concentration of washing liquid gave the best cleaning effects. The ultrasonic cleaning method is applicable for cleaning of returnable plastic crates and it stands comparison with the washing tunnel method.

AB - The hygiene of equipment surfaces plays an important role in dairy manufacture. Especially the environment in which products are packed can easily get contaminated. Returnable transport packages or crates can be one source of contamination. The cleaning of these packages is often incomplete and pathogens and spoilage organisms attached to surfaces can easily survive through the washing process. Hygiene of returnable plastic crates cleaned in washing tunnel was determined in Valio Ltd. Herajoki plant. The cleaning parameters and the microbiological quality of washing liquid were monitored. Using artificially soiled crate pieces were performed the pilot-scale studies with ultrasonic washing system. Design of Experiment (DOE, Taguchi method) was used to optimise the cleaning procedure. According to the results the bottom parts of the crates were the dirtiest parts with the worst cleaning results. Temperature, duration of washing and washing liquid quality varied much in the washing tunnel. Pilot tests showed that the sodium hydroxide (NaOH) containing EDTA was the most efficient detergent in the ultrasonic washing system. The cleaning time of 100 s and the 5 % concentration of washing liquid gave the best cleaning effects. The ultrasonic cleaning method is applicable for cleaning of returnable plastic crates and it stands comparison with the washing tunnel method.

M3 - Conference article in proceedings

SN - 951-38-6284-4

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Klemetti I, Arpiainen M, Salo S, Wirtanen G. An ultrasonic washing system and its applicability in cleaning of returnable plastic crates. In 34th R3-Nordic Contamination Control Symposium. Espoo: VTT Technical Research Centre of Finland. 2003. p. 37-43. (VTT Symposium; No. 229).