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RECYClED linERBoARD CHEMisTRY world pulppaper46 The recent worldwide economic recovery and globalisation of the market has brought about a rallying demand for containerboard. Faster machine speeds increased operating rates and the ongoing demand for fibre to fulfill production needs has been a challenge across the industry. This demand has caused fibre prices to fluctuate especially recycled fibre such as OCC from recovery processes. Many producers target fibre reduction as it has a direct link with manufacturing cost and selling prices. This issue is discussed daily in plants across the globe. Having a well-managed chemical programme and well-run mechanical operation is an effective way to sustain the process of fibre reduction without compromising ECT or compression strength. Lighter basis weights strength and energy costs are key drivers in the board and packaging market. However achieving the desired end-product performance to satisfy demand while maintaining and improving production efficiency can be a difficult task. Often chemical dry strength additives are used as a tool to balance the negative impacts that can come from attempts to lower total operating cost. THE liGHT-WEiGHTinG oF ConTAinERBoARD The shift to lighter basis weights for containerboard has been a compelling industry trend for the last 25 years. Since the adoption of Alternate Rule 41 in 1990 many users have opted for box compression standards as the preferred method for specifying their boxes. By Brad Benz Senior Industry Technical Consultant and Brian Duffy Director of Marketing Nalco An Ecolab Company Strength and productivity achieved in high performance recycled linerboard Many producers target fibre reduction as it has a direct link with manufacturing cost and selling prices Several factors have influenced this shift including advances in manufacturing technology shifts in fibre supply supply chain considerations and sustainability awareness. Over time basis weights have been steadily declining for key linerboard grades as illustrated in Table 1. Achieving strength and basis weight targets can be a challenge for any papermaker especially when lower quality fibres are part of the furnish mix. Nalcos patented METRIX technology programme allows paperboard manufacturers to increase strength lower basis weight enhance production and improve sheet quality. Variability in both quality and supply of raw materials presents additional challenges. Increasing refining to achieve strength often leads to reduced drainage lower retention and higher energy costs. Increasing starch dosages may be ineffective as fibres become saturated and additional starch cannot be retained. Overuse of other cationic additives such as alum and coagulants may also cause the furnish to become cationically dispersed affecting retention sizing system foam and finished product quality. Nalco developed the multi- functional METRIX technology to allow board manufacturers to simultaneously optimise basis weight strength caliper and sheet smoothness. Nalco METRIX technology gives papermakers the flexibility to increase strength while at the same time reducing basis weight increasing machine speed improving sheet properties and lowering fibre and energy costs. nAlCo innoVATion DEliVERs VAluE Nalcos commitment to developing new technologies products and technical expertise underpins their continuing advancement as an innovation leader. This commitment is also key to expanding their customer relationships. For more than 90 successful years Nalco has designed solutions to align Table 1. Basis weights for key linerboard grades have been steadily declining