Unit_6_-_Paper_and_Paperboard (3)

Unit_6_-_Paper_and_Paperboard (3) - out in a horizontal...

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6.7 The Fourdrinier Process The Fourdrinier process is used to manufacture paper and some forms of paperboard. A Fourdrinier machine is a huge array of equipment organized into sections to perform various functions. A paper machine can be up to 20 ft high, 30 ft wide and 300 ft long. Before the pulp goes into the papermaking machine, additional water is added to make a slurry that is approximately 99% water and 1% cellulose. This mix is fed into a device called a headbox. The headbox is a large rectangular tank with a slot at the bottom. The slurry flows
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Unformatted text preview: out in a horizontal direction, landing on the forming fabric, or “wire”. Originally, the wire was formed from wires, made of copper, brass, bronze, or stainless steel; however, in most modern paper machines the forming fabric is made of plastic mesh. The wire functions like a screen and allows the water to drain through it, leaving the fibers behind to form the mat that will become the finished paper. Suction is usually applied to help with water removal. 6. 8...
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