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Reduction of wet-end rewetting using super absorbents
2010 (Engelska)Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

In previous studies it has been corroborated that rewetting occurs after suction boxes and couch rolls. A certain amount of water is left in the forming fabric after the suction zone, resulting in external rewetting which decreases the dry content of the web with 3-5 % - units. In the present work different super absorbents with high absorption capacity were used with the intension to absorb the water left in the forming fabric after a suction pulse before it flowed back into the web. First the possibility of reducing rewetting was investigated in laboratory scale. A super absorbent was placed underneath the forming fabric and the web in a laboratory suction box during a suction pulse. A number of different absorbents were tested and several of them did significantly reduce the rewetting of the web. In some trials the reached dry content did not decrease at all after the suction pulse. Second the idea was verified in pilot scale. The rewetting was unfortunately not reduced in the same extent in the pilot trials as in the laboratory trials. But with the proposed justifications of the method it could be proved to work in also pilot scale.

Ort, förlag, år, upplaga, sidor
2010.
Nyckelord [en]
Physics Chemistry Maths, Reweting
Nyckelord [sv]
Fysik, Kemi, Matematik
Identifikatorer
URN: urn:nbn:se:ltu:diva-43056ISRN: LTU-EX--10/127--SELokalt ID: 0f90a74d-7672-4bbe-a0c1-dd49727dda56OAI: oai:DiVA.org:ltu-43056DiVA, id: diva2:1016284
Ämne / kurs
Examensarbete, minst 30 hp
Utbildningsprogram
Civilingenjör, Kemiteknik
Examinatorer
Anmärkning
Validerat; 20101217 (root)Tillgänglig från: 2016-10-04 Skapad: 2016-10-04Bibliografiskt granskad

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