Blade coating with free jet applicator: Modeling and experiments

H. Pajari, J. Mansikka-Aho, J. Ketoja, D. W. Bousfield

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

3 Citations (Scopus)

Abstract

This work had three main objectives. The first one was to make a sufficiently accurate macroscopic model for blade coating with the free jet applicator unit. The model takes into account viscous forces with lubrication approximation. Inertial forces before the blade are calculated from the momentum balance. Filter cake growth and inertial forces affecting this growth are included in the model. Compression of the web and roll cover can be taken into account by using a spring model. The second objective was to measure as many model parameters as possible to reduce the number of adjustable parameters. All input parameters for the model except the elastic moduli were experimentally evaluated. The third objective was to verify the model by comparing calculated and measured blade pressures at the pilot coater. This required that the tube force transfer curve was determined. The model predicted experimental blade pressures fairly well especially at higher speeds (2000 m/min). However, contrary to our presumptions and the model predictions the influence of the mass flow from the jet i.e. the influence of impulse force on coat weight was insignificant.

Original languageEnglish
Title of host publicationProceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium
PublisherTAPPI Press
Pages65-82
Number of pages18
ISBN (Print)1-9306-5704-8
Publication statusPublished - 3 Nov 2003
MoE publication typeNot Eligible
EventProceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium - Chicago, IL, United States
Duration: 8 May 200310 May 2003

Conference

ConferenceProceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium
CountryUnited States
CityChicago, IL
Period8/05/0310/05/03

Fingerprint

Applicators
Coatings
Experiments
Lubrication
Momentum
Compaction
Elastic moduli

Cite this

Pajari, H., Mansikka-Aho, J., Ketoja, J., & Bousfield, D. W. (2003). Blade coating with free jet applicator: Modeling and experiments. In Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium (pp. 65-82). TAPPI Press.
Pajari, H. ; Mansikka-Aho, J. ; Ketoja, J. ; Bousfield, D. W. / Blade coating with free jet applicator : Modeling and experiments. Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium. TAPPI Press, 2003. pp. 65-82
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Pajari, H, Mansikka-Aho, J, Ketoja, J & Bousfield, DW 2003, Blade coating with free jet applicator: Modeling and experiments. in Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium. TAPPI Press, pp. 65-82, Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium, Chicago, IL, United States, 8/05/03.

Blade coating with free jet applicator : Modeling and experiments. / Pajari, H.; Mansikka-Aho, J.; Ketoja, J.; Bousfield, D. W.

Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium. TAPPI Press, 2003. p. 65-82.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - This work had three main objectives. The first one was to make a sufficiently accurate macroscopic model for blade coating with the free jet applicator unit. The model takes into account viscous forces with lubrication approximation. Inertial forces before the blade are calculated from the momentum balance. Filter cake growth and inertial forces affecting this growth are included in the model. Compression of the web and roll cover can be taken into account by using a spring model. The second objective was to measure as many model parameters as possible to reduce the number of adjustable parameters. All input parameters for the model except the elastic moduli were experimentally evaluated. The third objective was to verify the model by comparing calculated and measured blade pressures at the pilot coater. This required that the tube force transfer curve was determined. The model predicted experimental blade pressures fairly well especially at higher speeds (2000 m/min). However, contrary to our presumptions and the model predictions the influence of the mass flow from the jet i.e. the influence of impulse force on coat weight was insignificant.

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Pajari H, Mansikka-Aho J, Ketoja J, Bousfield DW. Blade coating with free jet applicator: Modeling and experiments. In Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium. TAPPI Press. 2003. p. 65-82