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Optimizing the benefit of retention chemicals
RISE, Innventia.
RISE, Innventia.
RISE, Innventia.
RISE, Innventia.
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Pre-flocculation of filler has been tested as a concept for improving the retention of filler and the strength properties of the sheet. The impact of the size of the filler floes on the mechanical retentionin a fibre network was investigated using a modified laboratory hand sheet former. The mechanical retention was found to increase linearly with both particle size and grammage of the fibre web. These results were confirmed in a full scale production trial on the FEX pilot paper machine at Innventia. Here different filler floe sizes were created through different chemical pre-flocculation strategies. The particle size in the flow to the headbox was measured with FBRM, and a linear relation between particle size and filler retention was found. Corresponding linear relation was seen in a pilot trial when adding filler and retention aid conventionally. This implies that mechanical retention constitute an important part of the filler retention not only upon pre-flocculation but also with conventional addition of filler and retention aid. Thus, the particle size before the headbox can be a good indicator of the retention level. For the conventional application of a two component retention aid system, the increased filler retention correlated to impaired formation and decreased sheet strength. On the contrary, pre-flocculation led to an increase in both sheet strength and filler retention, demonstrating the advantage of pre-flocculating filler.

Place, publisher, year, edition, pages
2014. , p. 11p. 463-476
National Category
Organic Chemistry Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-9553Scopus ID: 2-s2.0-84939557231OAI: oai:DiVA.org:ri-9553DiVA, id: diva2:968299
Conference
PaperCon 2014, Nashville, Tennessee, USA, 27-30 Apr. 2014
Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2019-08-12Bibliographically approved

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