On-line measurement of paperboard air permeability using aerostatic bearings

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

1 Citation (Scopus)

Abstract

On-line measurement of paperboard air permeability during the manufacturing process allows process control with a shorter feedback loop than measuring off-line in the lab after the process. Measuring the permeability with airflow-based instruments has been only possible with stationary sample pieces, as the sample needs to be clamped against the instrument to create a seal between the instrument and the sample. The proposed method is based on creating a pressure difference across the paperboard and measuring the air flow rate through the web. The control volumes of the developed device are sealed against the paperboard with porous aerostatic bearings, in contrast to conventional solutions utilizing contact seals such as O-rings. Using aerostatic non-contact seals, paperboard web can travel through the measurement device at a high speed. The accurate measurement of the flow through the paperboard requires measurement of the seal leakage flowrate and the chamber inlet and exhaust flow rates. Thus, the air feeds are instrumented with flow meters, and the seal is designed so that it divides the flow to the volume and the ambient in a deterministic way. The present study focuses on stationary performance of the proposed method and does not consider the effects originating from the web traveling through the device. The device is validated in stationary conditions against a reference measurement, that uses a device based on O-rings to seal against the paperboard. Presented comparison of the studied non-contact seal to the reference contact seal allows determining the accuracy of the air permeability measurement method, including the methods to mitigate the effects of the added air flow from the aerostatic bearings.

Original languageEnglish
Title of host publicationEuropean Society for Precision Engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022
EditorsRichard K. Leach, A. Akrofi-Ayesu, C. Nisbet, Dishi Phillips
Publishereuspen
Pages187-188
Number of pages2
ISBN (Electronic)978-1-9989991-1-8
Publication statusPublished - 2022
MoE publication typeA4 Conference publication
EventInternational Conference of the European Society for Precision Engineering and Nanotechnology - Geneva, Switzerland
Duration: 30 May 20223 Jun 2022
Conference number: 22

Publication series

NameEuropean Society for Precision Engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022

Conference

ConferenceInternational Conference of the European Society for Precision Engineering and Nanotechnology
Abbreviated titleEUSPEN
Country/TerritorySwitzerland
CityGeneva
Period30/05/202203/06/2022

Keywords

  • aerostatic bearing
  • aerostatic seal
  • paperboard permeability

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