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Abstract: In this work, the treatment of paper machine whitewater obtained from paper production by using loose and tight Nanofiltration (NF) membranes in a lab-scale plant with a plate and frame module was investigated. The NF membranes were evaluated for fouling, flux decline due to concentration polarization and their suitability for removing of components present in wastewater. The loose NF membrane was used for the first step under different transmembrane pressure (8 to 32bars) and pH (3, 5.6 and 10) values. The best filtration performances were provided under a pressure of 32bar and a pH of 5.6. The fouling mechanism at different transmembrane pressures and pH values was investigated by “Hermia''s model”. Also, fouling on pores and on the surface of NF membranes was characterized by Scanning electron microscopy (SEM) and contact angle measurements, respectively. For the advanced treatment of permeate obtained from the loose NF membrane that provided the lowest fouling and flux decline, a tight NF membrane was used in the second step. Even better retentions were achieved from experiments with this NF membrane. Results obtained in this study showed that the combination loose and tight NF membranes achieved reuse of paper machine white water for use as shower water of paper machine. [Copyright &y& Elsevier]

The article presents research concerning the nature of web seams, their characteristics, bibliographic significance, and application to the analysis of books printed with machine-made paper made during the early nineteenth century. The collection of observations are meant to contribute further to comments presented in a paper by Catherine M. Rodriguez titled "The Use of Web Seam Evidence to Determine Format." The basic terms used in the making of paper by machine, such as wire, seam and web, are defined. Suggested systems for recording the incidence of seam marks and the possible application of seam marks to bibliographical analysis are discussed.

Presents a state variable model for the drying section of a paper-making machine. Linearization and design of the model; What the solution for the model yielded; Specification of boundary conditions; Comparison of the obtained results with dynamic model results; What the study concluded.

The article presents a roundtable discussion which explores how paper mills can work with machinery and fabric suppliers to manage machine clothing changes during rebuilds. One of the participants discusses some levels of involvement that a mill can pursue to ensure that fabrics are correctly selected for a rebuild. Another participant explores some factors to consider regarding the rebuild of the forming section and clothing application. They also explain the effect of paper machines conversions to higher value grades on forming machinery and fabrics.

Explores the trends in the manufacture of paper machinery in the U.S. Emphasis of larger suppliers towards twin-forming technology; developments in cylinder forming; Trends in forming fabrics.

The article reports on developments in Helsinki, Finland-based Metso Paper Inc. The company has agreed to buy the entire share capital of Shanghai-Chenming Paper Machinery Co. Ltd. in Jiading, China. It has also concluded the sale of certain assets of its water management business to GL&V in Montreal, Quebec. Meanwhile, two Metso Paper-supplied paper machines at two separate UPM paper mills set new world speed records.

The article reports that Krefeld, Germany-based Küsters Paper showcased its developments in the fields of calendars, shoe presses and rolls at the EXFOR exhibit in Montreal, Quebec. The exhibition's focus was on the small shoe press which the company offers under the brand name X-NIP C. The shoe press can be used for material widths up to 5000 mm and a line force of up to 500 N/mm.

The article reports on developments in Voith Paper Inc., a supplier of paper making machinery, in Europe. Voith Paper Automation has equipped Stora Enso Publication Papers Oy Ltd.'s Kabel Mill with a quality control system for Offline Coating Machine Number SM5. Kiev Cardboard & has chosen Voith Paper to upgrade the stock preparation of its Number 1 Board Machine. Voith Paper is reporting the successful test run of the Number 2 Paper Machine at UPM Shotton's paper mill in Great Britain.

Reports that Maintal, Germany-based papermaking machinery industry VIB Systems GmbH received an order through Metso Paper Inc. for its AirtTechplus 6 and GlossTech systems for both paper machine and calender.

Reports that Acton, Massachusetts-based papermaking machinery manufacturer Kadant Inc. has received an order for stock-preparation equipment from China-based linerboard producer Zhejiang Ji'an Paper Packet Co. Ltd.

Presents the TAPPI Process and Product Quality Division Technical Award and Richard S. Hunter Prize to Roland J. Trepanier, the president of OpTest Equipment Inc. in Ontario. Contribution of Trepanier to the paper industry technology; Educational background of the executive; Expertise in fiber and paper physics research with emphasis to the manufacturing process and final product quality.

Reports that the Bolton, England-based Sandusky Walmsley has ten Yankee dryers on order from customers around the world. Increase in production capacity for various tissue grades.

Presents updates on the projects of Metso Paper in Helsinki, Finland as of July 2004. Supply of automation solutions to Stora Enso's Kvarnsveden mill in Sweden; Rebuild of forming section of Norske Skog Bruck Mill; Provision of valves to Veracel Celulose SA.

Highlights papermaking-related products available as of April 2004. Windsocks for detecting wind direction from American Windsock; Chemineer's maxflo wse impeller; Coade's updated Codecalc pressure vessel software; Weavexx huyperm press felt technology; Multitherm IG-1 heat transfer fluid; Others.