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with their customers key business drivers resulting in significant economic and environmental benefit. Over the past 15 years Nalco has committed significant resources and research investment into the continued development of METRIX technology for strength and productivity. Their 9th and 10th generations of this technology are currently being marketed on a global scale. In the board and packaging sector an integrated team approach is used to align additive chemistry and best available mixing efficiency with the papermakers key business drivers. These teams identify problems and opportunities around strength and grade development at the customers plant. Nalcos research teams then work to develop effective solutions to these needs often working jointly with their customers research and development teams. The team participates in ongoing implementation and optimisation to ensure that their solutions deliver maximum value. BACKGRounD A linerboard manufacturer capable of producing 1200 tons 1091 metric tonnes per day was experiencing serial reductions in production. Most days averaged 1030 tons 938 metric tonnes which was due to a need for higher basis weight to meet quality specifications. Low production was most prevalent on 35 170 gm2 high performance linerboard and 42 205 gm2 linerboard. This integrated board mill uses a higher percentage of recycled fibre in comparison with unbleached kraft pulp 65 and 35 respectively. Recycled fibre quality has suffered over the years. The thick stock Canadian Standard Freeness CSF data showed recycled fibre had declined by 100mL or greater from the facilitys recycling plant. Lower freeness was making it increasingly difficult several mechanical changes refining fourdrinier set- up pressing drying contributed to minimal improvements in strength and speed to achieve sheet quality parameters at nominal basis weight and target speedproduction. On occasion the paper machine was running at target speed but rarely longer than one day. Several mechanical changes refining fourdrinier set-up pressing drying contributed to minimal improvements in strength and speed. In addition several wet-end chemical trials coagulant flocculant starch silica strength resin achieved minimal to moderate benefit in quality parameters. To meet quality goals the mill was forced to run 2-3 lb 0.9-1.4 kg over standard basis weight on select grades for this paper machine. This manufacturer sells finished board on a manufactured square footmetre basis therefore running over target creates several drawbacks including increased fibre cost slower machine speed decreased production rates and higher energy unit cost per ton of linerboard produced. The manufacturer wanted to run the machine at nominal basis weight or below while maintaining strength targets in ring crush and mullen. Additional key business drivers included production rates and reduced operating costs. Nalco understood that meeting these goals could prove difficult given the present and past operating conditions on the paper machine given that minimal impacts had been realised with any previous changes. Nalcos Industry Technical Consultants in cooperation with on-site Nalco personnel performed a thorough mechanical operational and chemical MOC audit. The team provided several recommendations in each area with a major focus on chemistry. From a chemistry standpoint there was a need to address drainage on the fourdrinier without disrupting sheet formation. This particular machine had a very long forming section. The wet-end chemistry and corresponding injection point was not overly complex with the use of alum starch rosin size and cationic flocculant. A review of audit findings was communicated to the manufacturer and a plan proposed to improve machine speed and increase strength. Chemical recommendations were made to limit early fourdrinier drainage focusing on vacuum drainage and pressing as well as strength development. world pulppaper 47 Mill oVERViEW Grade linerboard Basis Weight Produced 35 and 421000 ft2 170 and 205 gsm Machine Type single Ply Fourdrinier Press Type 1st straight through 2nd lnP Production Rate 45 TPH Machine speed 1700-2250 fpm 518-686 mpm Furnish 65 oCC and 35 Kraft Wet-end Chemistry CPAM Flocculant Thin Thick stock Potato starch Rosin size Alum pH 5.2 Case study