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The effect of beating, sizing, wet pressing and calendering on edge wicking studied by pressurised and atmospheric edge wicking techniques
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The board web is disinfected in a bath of hydrogen peroxide before the package is filled in a Tetra Brik filling machine. The depth of the bath induces an external pressure on the board, which increases the edge wicking. Edge wicking is traditionally measured at atmospheric pressure in hot hydrogen peroxide to predict the edge absorption of the product into the board edges. A new method of measuring edge wicking has been developed with the possibility to apply an external pressure corresponding to the pressure in the hydrogen peroxide bath in the filling machine. The objective with this thesis was to study the impact of wet pressing, beating, sizing and calendering on the edge wicking and to make a comparison between the pressurised (P.E.W.) and the atmospheric (A.E.W.) methods of measuring edge wicking. The study was performed with hand made and machine made sheets. The hand made sheets were made in a Finnish sheet former from pulp beaten to three different levels and with four different dosage levels of sizing agents. The sheets were then wet pressed and calendered at three different levels. Wet pressing, beating and sizing decreased the P.E.W. and A.E.W. The effect of calendering was different between the two techniques. P.E.W. clearly decreased and A.E.W. increased or was unaffected by calendering. The reason why A.E.W. increased for calendered samples might be that the sizing efficiency decreased due to changes in the paper structure. The fibre matrix with sizing molecules that have spread in a favourable way during the drying and curing process is disturbed by the calendering.

Place, publisher, year, edition, pages
Keyword [en]
Technology, edge wicking, hydrogen peroxide, board, beating, sizing, wet, pressing, calendering
Keyword [sv]
URN: urn:nbn:se:ltu:diva-43775ISRN: LTU-EX--01/295--SELocal ID: 19bf9a33-27b4-45cb-8594-a1b6bb385d3bOAI: diva2:1017016
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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