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Reduction of wet-end rewetting using super absorbents
2010 (engelsk)Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
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.

sted, utgiver, år, opplag, sider
2010.
Emneord [en]
Physics Chemistry Maths, Reweting
Emneord [sv]
Fysik, Kemi, Matematik
Identifikatorer
URN: urn:nbn:se:ltu:diva-43056ISRN: LTU-EX--10/127--SELokal ID: 0f90a74d-7672-4bbe-a0c1-dd49727dda56OAI: oai:DiVA.org:ltu-43056DiVA, id: diva2:1016284
Fag / kurs
Student thesis, at least 30 credits
Utdanningsprogram
Chemical Engineering, master's level
Examiner
Merknad
Validerat; 20101217 (root)Tilgjengelig fra: 2016-10-04 Laget: 2016-10-04bibliografisk kontrollert

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