Online monitoring method for detecting coating wear of screen cylinders

Aino Helle

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

Abstract

Screen cylinders are used to separate unacceptable fibres and sand, grit, pins, glass and other contaminants from pulp. In order to improve wear resistance, the feed surfaces of the screen cylinder wires are hard chrome plated. Coating failure results in rapid wear of the substrate and the cylinder needs to be replaced. If the wear of the chrome plating could be monitored and the coating failure detected early enough to prevent wear of the substrate material, recoating of the cylinder would be possible. Experimental research was carried out to study the possibilities of various methods such as electrochemical measurements, resistance measurements and fibre optical sensors for monitoring the wear of chrome coating. A method was developed for embedding a conductive wire for resistance measurements or the optical fibre underneath the chrome plating. It was demonstrated that both methods could be used to detect the coating failure, whereas the electrochemical measurements were not found suitable in this application. Further development work is required to adapt the methods into industrially applicable form. The methods could be utilised also in other applications than the screen cylinder. The benefits will be highest in applications where coating failure results in rapid failure or quality loss and where recoating, instead of component replacement, would give significant cost savings. In the case of screen cylinders, the costs can be reduced even to one third of the cost of replacement by recoating.
Original languageEnglish
Title of host publicationPrognostics for industrial machinery availability
Subtitle of host publicationFinal seminar
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages155-168
ISBN (Electronic)951-38-6310-7
ISBN (Print)951-38-6309-3
Publication statusPublished - 2006
MoE publication typeB3 Non-refereed article in conference proceedings
EventPrognostics for Industrial Machinery Availabitity - Final Seminar - Espoo, Finland
Duration: 12 Dec 200612 Dec 2006

Publication series

NameVTT Symposium
PublisherVTT
Number243
ISSN (Print)0357-9387
ISSN (Electronic)1455-0873

Conference

ConferencePrognostics for Industrial Machinery Availabitity - Final Seminar
CountryFinland
CityEspoo
Period12/12/0612/12/06

Fingerprint

Wear of materials
Coatings
Monitoring
Plating
Wire
Costs
Fiber optic sensors
Substrates
Pulp
Wear resistance
Optical fibers
Sand
Impurities
Glass
Fibers

Cite this

Helle, A. (2006). Online monitoring method for detecting coating wear of screen cylinders. In Prognostics for industrial machinery availability: Final seminar (pp. 155-168). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 243
Helle, Aino. / Online monitoring method for detecting coating wear of screen cylinders. Prognostics for industrial machinery availability: Final seminar. Espoo : VTT Technical Research Centre of Finland, 2006. pp. 155-168 (VTT Symposium; No. 243).
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Helle, A 2006, Online monitoring method for detecting coating wear of screen cylinders. in Prognostics for industrial machinery availability: Final seminar. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 243, pp. 155-168, Prognostics for Industrial Machinery Availabitity - Final Seminar, Espoo, Finland, 12/12/06.

Online monitoring method for detecting coating wear of screen cylinders. / Helle, Aino.

Prognostics for industrial machinery availability: Final seminar. Espoo : VTT Technical Research Centre of Finland, 2006. p. 155-168 (VTT Symposium; No. 243).

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

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AB - Screen cylinders are used to separate unacceptable fibres and sand, grit, pins, glass and other contaminants from pulp. In order to improve wear resistance, the feed surfaces of the screen cylinder wires are hard chrome plated. Coating failure results in rapid wear of the substrate and the cylinder needs to be replaced. If the wear of the chrome plating could be monitored and the coating failure detected early enough to prevent wear of the substrate material, recoating of the cylinder would be possible. Experimental research was carried out to study the possibilities of various methods such as electrochemical measurements, resistance measurements and fibre optical sensors for monitoring the wear of chrome coating. A method was developed for embedding a conductive wire for resistance measurements or the optical fibre underneath the chrome plating. It was demonstrated that both methods could be used to detect the coating failure, whereas the electrochemical measurements were not found suitable in this application. Further development work is required to adapt the methods into industrially applicable form. The methods could be utilised also in other applications than the screen cylinder. The benefits will be highest in applications where coating failure results in rapid failure or quality loss and where recoating, instead of component replacement, would give significant cost savings. In the case of screen cylinders, the costs can be reduced even to one third of the cost of replacement by recoating.

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Helle A. Online monitoring method for detecting coating wear of screen cylinders. In Prognostics for industrial machinery availability: Final seminar. Espoo: VTT Technical Research Centre of Finland. 2006. p. 155-168. (VTT Symposium; No. 243).