Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Fibre orientation anisotropy profile over the thickness of a headbox jet
KTH, Tidigare Institutioner, Pappers- och massateknik.
KTH, Tidigare Institutioner, Pappers- och massateknik.
2004 (engelsk)Inngår i: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 30, nr 8, s. 217-221Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The fibre orientation anisotropy at various levels of the jet from a model headbox has been investigated. Stiff nylon fibres, 3 mm long, were added at extremely low concentrations to make it possible to observe also the centre of the jet. This meant that fibre interactions, such as floc forming, could not take place. Transparent, parallel walls enclosed the jet where fibre orientation was measured. A thin laser sheet illuminated the jet from the side and a video camera captured the light reflected perpendicularly from the fibres. Using image analysis, the orientation of the fibres was evaluated. A central vane was mounted in the headbox nozzle so the effects of the vane wake could be studied. The results show that the effect a the boundary layers, at the walls of a headbox and at the surface of a vane, was to locally reduce fibre orientation anisotropy. Depending on the vane tip shape, fibre orientation anisotropy could be additionally decreased. Overall, the fibre orientation anisotropy was weakly affected by changes inflow rate and strongly dependent on the contraction ratio in the nozzle; low speed and large contractions produced more anisotropic orientations.

sted, utgiver, år, opplag, sider
2004. Vol. 30, nr 8, s. 217-221
Emneord [en]
orientation, fibers, anisotropy, profiles, head boxes, jets, nozzles, image analysis, machine design
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-41200ISI: 000224327100002Scopus ID: 2-s2.0-20344363667OAI: oai:DiVA.org:kth-41200DiVA, id: diva2:443598
Merknad

QC 20110926

Tilgjengelig fra: 2011-09-26 Laget: 2011-09-23 Sist oppdatert: 2017-12-08bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Scopus

Søk i DiVA

Av forfatter/redaktør
Asplund, GNorman, Bo
Av organisasjonen
I samme tidsskrift
Journal of Pulp and Paper Science (JPPS)

Søk utenfor DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric

urn-nbn
Totalt: 949 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf