Paper360 - March/April 2016 - (Page 48)

techlink | INSIDE W W W. TA P P I . JOURNAL ORG G INDUSTRI ES' TECHNICA THE PAPER AND PACKAGIN L RESOURC E VOL. 15 NO. 1 J A N U A R Y 2016 | Progress in Paper Recycling 9 PRE-WETTING Press wetting as an enhanced wetting method for baled OCC material 90°C Veikko Heikki Upola, Ari Ämmälä, Illikainen Kankaanpää, and Mirja 19 INK DISPERSION Factors influencing polymeric granule-assisted dispersion of ultraviolet ink 75°C Preeti Tyagi, Thomas Schrinner,Ray, Kumar Steffen Richter, Amiya and Harald Grossmann 33 DRUM PULPING Falling impact as an isolated in drum disintegration mechanism pulping for packaging board 60°C Veikko Heikki Upola, Ari Ämmälä, Illikainen Kankaanpää, and Mirja 41 MINERAL OIL REMOVAL Removal of mineral oil during recovered paper processing Christian Ewald, Antje and Samuel Schabel 45°C Kersten, DEINKING 49 Study on neutral chemical deinking of laser printed papers Yujie Gao, Xiaojiao Yuan, and Jing Li Limin Gao, 30°C The adsorption deinking process. TJ SUMMARIES The papers summarized here are from the January 2016 issue of TAPPI JOURNAL featuring special recycling content. TAPPI JOURNAL is an online publication of relevant and timely peer-reviewed research delivered via email and free to all TAPPI members. To receive TAPPI JOURNAL, join TAPPI at Press transition and force graph with experimental arrangement of press bales used in the press wetting study. PREWETTING Press wetting as an enhanced wetting method for baled OCC material Heikki Upola, Ari Ämmälä, Veikko Kankaanpää, and Mirja Illikainen A procedure to mechanically force water into the bale structures of old corrugated container (OCC) material was studied and evaluated in low-consistency pulping. The study used two mechanical methods: (1) roll pressing of sheets and (2) press wetting of bales. Mechanical pressing was first used in simple roll tests to evaluate nip pressure as an enhanced effect on wetting. Researchers found that repeated press wetting treatments increased water penetration into the sheets and appeared to lower wet strengths. The researchers also found that when a bale was pressed under water, multiple pressings were needed to get efficient press wetting. 48 Paper360º MARCH/APRIL 2016 Increased temperature was found to increase water penetration inside the porous structure of linerboard. They also discovered that there must be a delay between relaxation and pressing to allow water to travel within a board and to wet all surfaces. The wetting procedure also evaluated the weight of water inside the bale. Results showed that the amount of water could be used as an indicator of the pulping kinetics and energy consumption needed to disintegrate OCC. The enhanced method (i.e., hydraulic pressing) could provide efficient wetting on an industrial scale. With this method, a 30 percent savings in the energy consumption required in pulping unit operation is possible. Mills can use this information to evaluate use of prewetting before pulping to increase low-consistency pulping capacity. INK DISPERSION Factors influencing polymeric granuleassisted dispersion of ultraviolet ink Preeti Tyagi, Thomas Schrinner, Steffen Richter, Amiya Kumar Ray, and Harald Grossman The objective of this research was to identify and evaluate the factors influencing polymeric granule-assisted dispersion of ultraviolet (UV) ink particles. First time, granule-assisted alternative dispersion was observed during adsorption deinking. By optimizing and combining this alternative dispersion process with pulping, the researchers aim to minimize the energy consumption in the dispersion process and thus reduce the environmental impact of the paper recycling process on carbon footprint. For experimental confirmation, a combination of printed paper and polymeric granules was selected such that ink detached from the fibers would not be adsorbed onto the surface of polymeric granules. Results showed that at 15 percent consistency, temperature 45°C, and mass ratio of oven dry pulp and granules of 1:1.5 (200 g pulp and 300 g granules), the granule-assisted dispersion process gives optimum results for reduction of specks size. These optimized parameters are similar to the optimized parameters of adsorption deinking, which give a further option to combine both steps (adsorption deinking and granule-assisted dispersion.) The researchers also demonstrated that the polymeric granule-assisted dispersion method is a viable replacement for the conventional dispersion process by assuring no alteration in fiber length, water retention value of pulp and strength properties of the handsheets. This research introduces an alternative method of dispersion for paper recycling that http://WWW.TAPPI.ORG

Table of Contents for the Digital Edition of Paper360 - March/April 2016

Over the Wire
Engineering: A Continuing Evolution
RISI’s European CEO of the Year
Sappi Europe: Serious About the Future of Paper
Reliability and Maintenance Beliefs – Part IV
Discovering Hidden Causes of Converting Problems
Barrier Technologies: The New Revolution in Food Packaging
Standard Bleaching Sequences Including an Ozone Stage – Part I
TAPPI Journal Summaries
Consolidation Watch
SWM Gets Faster ERP Financial Data
Battling Rejection Burnout
Association News
Index of Advertisers

Paper360 - March/April 2016