Effect of Ca2+-Pectates on Drainage and Paper Properties of Mechanical Pulp

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Saarimaa V, Sundberg A, Holmbom B
Publisher: PULP & PAPER TECHNICAL ASSOC CANADA
Publication year: 2008
Journal: Journal of Pulp and Paper Science
Journal acronym: J PULP PAP SCI
Volume number: 34
Issue number: 2
Start page: 85
End page: 90
Number of pages: 6
ISSN: 0826-6220


Abstract

The effect of Ca2+ and model pectic acids of different molar mass on drainage, sheet properties and heat-induced yellowing of TMP was studied. The aggregation of pectic acids by Ca2+ was strongly dependent on the molar mass of pectic acids. Ca2+-concentrations over 0.3 mmol/L induced strong retention of pectic acids with molar mass > 7.8 kDa. The retained Ca2+-pectates resulted in impaired drainage rate. The formed paper sheets were thicker and the grammage was slightly higher. Also brightness was decreased. Pectic acids are slightly coloured compounds, the yellowish colour becoming stronger at lower molar mass, and they showed some contribution to heat-induced brightness reversion.


Keywords

CALCIUM, DRAINAGE, MECHANICAL PULP, PECTIC ACIDS, SHEET PROPERTIES

Last updated on 2019-17-10 at 01:33