AP-24 Pulp & Paper Paper machine Boil-out ©PSX2010 AP-24 01/10 Application: Paper Machine Boil-out White water is a fine particle slurry used throughout the papermaking process. Its name derives from fine fiber particles in the water that give it a milky white appearance. White water drains from the paper stock into pit below the paper machine and is used for a variety of uses in the papermaking process White water systems must periodically be cleaned to remove bacterial buildup that occurs over time. This process is known as boil-out, in which the white water is raised to near boiling temperatures (around 180- 190°F) to kill any bacteria in the system. A caustic solution is sometimes added shorten the process and increase the effectiveness. The water is held at

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