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Open Access
Rewet suppression through press felt engineering, TAPPI Journal June 2022

ABSTRACT: Due to the immense energy and associated financial cost of drying paper, achieving a drier web entering the dryers is a key objective in paper manufacture. One major research thrust has been finding a way to increase press solids by mitigating or eliminating rewet in the press section. For decades, solutions to this problem have remained elusive. In this work, we develop a novel approach that significantly reduces rewet by rupturing the liquid channels between felt and web. We illustrate the effects that altering the mechanical and surface properties of the press felt matrix have on the stability of these liquid channels. In a laboratory-scale platen press, a 40% reduction in the residual water of 120 g/m2 southern bleached softwood kraft (SBSK) pulp handsheets after pressing was observed, corresponding to an increase in press solids from 48% to 61%. For reference, pressing under identical conditions with paper blotters, in which minimal rewet is presumed to occur, resulted in 64% solids. Furthermore, we observed enhanced dewatering across a range of basis weights, applied pressures, and felt types. In addition to measuring the solids content of pressed sheets, we capture and analyze video evidence of the mechanisms at play in our improved dewatering technology.

Journal articles
McDonald’s Japan Scraps Paper Straws

McDonald’s Japan has replaced its controversial paper straws with ‘strawless’ lids made from recycled PET, but consumers are still divided on the new solution’s practicality. Tim Sykes reflects on this demand for convenience, sometimes at the expense of sustainable progress, and what we can learn from getting the balance wrong. 

Journal articles
Sustainable Energy Management with the Maflex Energy Regenerative System

In today's competitive market, tissue converting plants are constantly seeking ways to increase production, manage costs, and reduce environmental impact. The Maflex Energy Regenerative System (MERS) offers a revolutionary solution that meets these needs by improving energy efficiency and sustainability.

Journal articles
Valmet to Supply a BioTrac System with Automation for OutNature's Agro-Residue Straw-Pulp Project in Germany

OutNature in Germany is taking a new innovative step in widening raw material sources for sustainable packaging production with converting agriculture residues into pulp blend based on straw fiber. Valmet has been selected to deliver pretreatment and automation systems to be an important part of the technology solution for this process.

Journal articles
Making Gravure Shine: Utilizing BOBST oneECG to Create Metallized Colors

Adding a luxury look to flexible packaging, BOBST oneECG (Extended Color Gamut) for gravure includes the ability to print a wide range of metallics colors with a standard ink set. By removing the need for expensive metallic inks, the solution simplifies production, cuts cost, increases design flexibility, and supports sustainability goals.

Journal articles
Voith Introduces New CellPress Roll Cover for Chemically Demanding Applications in Pulp Production

With CellPress, Voith brings a roll cover to the market that specifically counteracts early wear of roll covers caused by chemicals and high temperatures. The solution was developed for applications in pulp dewatering machines that operate under particularly demanding chemical and thermal conditions.

Journal articles
Norske Skog Skogn Selects ANDRITZ Technology to Start Book Paper Production

Norske Skog Skogn is preparing to enter the European book paper market supported by a comprehensive technology package developed in collaboration with international technology group ANDRITZ. This solution will enable the conversion of Paper Machine 1 (PM1) to flexibly produce both newsprint and the new NOR Book grade.

Journal articles
Voith Launches PluraMaze to Reduce Energy Consumption in Refining with Proven Customer Benefits

Voith introduces PluraMaze, a new generation of refiner fillings designed to significantly improve energy efficiency and lifetime in refining. The new solution addresses key challenges faced by paper manufacturers worldwide, including rising energy costs, increasing pressure on efficiency and changing raw material qualities.

Journal articles
Tetra Pak Extends Paper-Based Barrier Packaging to High-Speed Packaging Lines in Asia

Tetra Pak has taken another step forwards in sustainable packaging by expanding its innovative paper‑based barrier technology to high‑speed Tetra Pak® A3/Speed filling lines, with Maeil Dairies becoming the first producer globally to implement the solution for its soy milk.

Journal articles
Voith and Wuzhou Specialty Paper Successfully Start Up First DuoCentri NipcoFlex Press with Center Belt

Following the contract announced in 2025, Voith has successfully started up PM 19 at Wuzhou Specialty Paper. The paper machine is the first worldwide to operate with Voith’s DuoCentri NipcoFlex press with center belt. The solution has now moved from development to commercial operation and has already demonstrated stable production and reliable web runnability.

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