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Using pH & conductivity measurement for stock prep and wet end control: as paper mills have begun closing their water systems, the need for conductivity monitoring has increased. Careful sensor selection and placement are critical to accurate control.(Practical Solutions)
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Solutions - for People, Processes and Paper
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March 1, 2002
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Copyright informationCOPYRIGHT 2002 Paper Industry Management Association. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Wet end chemistry is complicated and delicate. The complex fiber and chemical additive mixture in the furnish makes chemical monitoring a must for most paper mills.
Most chemical additives only work in a narrow range. Solution pH also affects the surface charge of the fiber, and bonding is dependent on this charge. Fibers and fines have a slight negative charge and attract positively changed particles or chemicals. As the pH drops, this negative charge increases. In stock preparation, pH will generally not be constant throughout the different stages. Often the optimal pH at one stage is different from another.
Fiber solubility, drainage optimization on the machine ...
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