PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 2, Number 2, 2016
Initial wet web strength of paper
Jürgen Belle & Jürgen Odermatt Despite much research into and development within the complex area of the initial wet web strength of paper, no complete model has yet been developed to describe this property. This type of paper strength is the most important property to ensure an effective paper machine run. Furthermore, the process of strength development in the sheet forming and pressing portion of the process is the basis of the final paper strength. Recent investigations have focused on the surface interactions of fibres on the molecular level. There have also been several innovative findings about fibre swelling and the impact of swelling on the mechanical characteristics of fibres in wet conditions. Overall, progress obtained using new methodologies enables a deeper understanding of the mechanism of strength development. This review discusses these important areas by examining the literature and the authors’ own work to obtain a better understanding of the strength development in wet paper webs. This paper highlights that the fibre morphology and the dryness of the wet web have the greatest impact on the strength of the wet web. As fibre sources and machinery are fixed, the fibre water gel is one of the easiest factors to adjust via the process water quality and the use of chemical additives.
This article is published with open access at Springerlink.com
The Paper Industry Technical Association (PITA) is an independent organisation which operates for the general benefit of its members – both individual and corporate – dedicated to promoting and improving the technical and scientific knowledge of those working in the UK pulp and paper industry. Formed in 1960, it serves the Industry, both manufacturers and suppliers, by providing a forum for members to meet and network; it organises visits, conferences and training seminars that cover all aspects of papermaking science. It also publishes the prestigious journal Paper Technology and the PITA Annual Review , both sent free to members, and a range of other technical publications which include conference proceedings and the acclaimed Essential Guide to Aqueous Coating .
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Article 1 – Papermaking & Wet Web Strength
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