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Advantages of lean duplex stainless steels in the pulp and paper industry, TAPPI Journal April 2023
ABSTRACT: The performance of lean duplex stainless steels has been utilized by the pulp and paper industry since their introduction to the market almost 20 years ago. Experience has shown that this group of stainless steels has exceptional performance in, for example, alkaline environments towards typical deterioration mechanisms, i.e., uniform corrosion and stress corrosion cracking. The chemistry of the “lean” duplex steels is designed so that the content of volatile and expensive elements like nickel and molybdenum can be reduced to an absolute minimum without sacrificing the technical performance. This reduces the raw material cost and most importantly provides predictability of the steel price, which is often challenging with conventional austenitic and duplex stainless steels.Thanks to a dual phase microstructure and high nitrogen content, lean duplex steels have at least two times higher strength compared to standard austenitic stainless steels. This is often a preferred feature in pulp and paper construction, as it enables lighter structures and less material to be utilized. Today, lean duplex steels are widely available in various dimensions, from thin cold rolled sheets up to thick hot rolled plates. Lean duplex steels are also fully recyclable after the decommissioning stage of the equipment, thereby contributing to the circular economy.
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Magazine articles
Editorial: PEERS and IBBC: TAPPI fall conferences address current and evolving challenges, TAPPI Journal August 2023
ABSTRACT: On November 5-8, TAPPI will host its 2023 Pulping, Engineering, Environmental, Recycling and Sustainability (PEERS) Conference. This year’s conference will be held in Atlanta and is co-located with TAPPI’s International Bioenergy & Bioproducts Conference (IBBC). Below are some highlights about what is in store for attendees.
Journal articles
Magazine articles
Energy saving potential of interstage screen fractionation for production of board grade BCTMP, TAPPI Journal August 2023
ABSTRACT: Over the last few decades, the continuing decline in mechanical pulp-based grades has led pulp producers to modify operations and implement measures to reduce production costs in order to stay competitive. In spite of a considerable effort to reduce energy consumption, the latter is still a major portion of production costs in the process of making bleached chemithermomechanical pulp (BCTMP). In this study, we evaluated the impact of interstage screening fractionation (ISSF) and secondary refining strategy for producing BCTMP with the objective of reducing refining energy consumption while maintaining or improving bulk and strength properties. In the first step and to establish a baseline for a mill’s existing configuration, the collected primary refined pulp and reject streams from the ISSF were refined in a high consistency (HC) refiner to target freeness levels. The accepts and refined rejects streams were recombined, and their properties were compared to those of the refined primary pulp. The results showed that, at a given freeness of 400 mL and compared to the control case (without fractionation), the ISSF using an 0.070 in. basket followed by rejects refining could lead to about 25% energy saving in the second stage HC refining. Handsheet properties showed that utilization of ISSF could produce BCTMP with higher bulk and similar average fiber length and tear index. However, a slight reduction in tensile strength was observed. In the second set of trials, the primary refined pulp and the rejects from the ISSF using the 0.070 in. basket were refined by a low-consistency (LC) refiner. The results showed that, at the same freeness of 400 mL and compared to refined primary pulp, the ISSF saved about 26% in net LC refining energy. At a specific edge load (SEL) of 0.4 J/m, the produced pulp had similar bulk and strength properties compared to those of the control sample. A higher SEL of 0.6 J/m in LC refining could further decrease net refining energy consumption; however, it also led to reduction in fiber length, bulk, and strength properties.
Journal articles
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A three-dimensional model of fine particle retention during
A three-dimensional model of fine particle retention during percolation through a fiber mat, TAPPI JOURNAL August 2015
Journal articles
Magazine articles
A novel approach to white liquor control in a continuous digester using the Box-Jenkins methodology to predict chip bulk density, TAPPI JOURNAL June 2015
A novel approach to white liquor control in a continuous digester using the Box-Jenkins methodology to predict chip bulk density, TAPPI JOURNAL June 2015
Journal articles
Magazine articles
Identifying microbially influenced corrosion on surfaces con
Identifying microbially influenced corrosion on surfaces contacted by mill waters, TAPPI JOURNAL November 2015
Magazine articles
Editorial: Gerry Ring: The potential in paper processing, TAPPI JOURNAL October 2015
Editorial: Gerry Ring: The potential in paper processing, TAPPI JOURNAL October 2015
Magazine articles
A waste management program for paper mill sludge high in ash, TAPPI JOURNAL, April 1990, Vol. 73(4)
A waste management program for paper mill sludge high in ash, TAPPI JOURNAL, April 1990, Vol. 73(4)
Magazine articles
The valmet tail shooter and tail blower improve safety and boost productivity, TAPPI JOURNAL, April 1990, Vol. 73(4)
The valmet tail shooter and tail blower improve safety and boost productivity, TAPPI JOURNAL, April 1990, Vol. 73(4)
Magazine articles
EuCePa conference and spci exhibit in stockholm draw from 21 countries in the papermaking world, TAPPI JOURNAL, August 1990, Vol. 73(8)
EuCePa conference and spci exhibit in stockholm draw from 21 countries in the papermaking world, TAPPI JOURNAL, August 1990, Vol. 73(8)