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Screening equipment is the important operational system for pulp processing. After separation of the black liquor from the fiber in the washing section the pulp contains coarser fibers, foreign matter and dirt as like pieces of bark, digester brick, cement etc. Hence this unwanted and troublesome matter should be removed to produce first quality pulp. Pulp screening equipment is applied in this regards.

There are two categories screens are used in pulp mills; coarse screens and fine screens. These screening equipment works basis on vibrating, shaking, gravity centrifugal and centripetal forces.

The major types of coarse screen are two types sliver screens and knotters. The examples of sliver screens such as bull screen, rotary scraper, rotary oscillating and the knotters such as worm knotter, Johnson knotter screen, diaphragm screen etc.

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Papermaking is a highly sophisticated process involving several processing steps to turn wood into paper products. In addition to the actual papermaking process, there are also supporting areas such as waste water treatment, recovery boiler operation, steam production, and cooling towers that benefit from on-line analytical measurements.

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In the process of paper making, most of the energy saving is related to improving the energy efficiency of the drying process and the utilization of the waste heat. In general, pulp and paper energy costs accounted for about 10% to 35% of the cost of production; consumption of vacuum consumption accounted for 15% of paper electric power consumption to 18%, most of the vacuum energy is supplied to the vacuum roller, suction tank and vacuum suction tank; drying is the highest part of energy consumption in the production of paper. The key factor to reduce the energy consumption is to increase the dry degree of paper after press.

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In 1921 Hugh Baker, in The Foundation of the Paper Industry , wrote “Next to food and clothing, the number one item that we manufacture in our civilization is paper. “ Paper is a fundamental factor in civilization.”

The origins of paper manufacturing are shrouded in mystery. Beginning in China, Egypt, and other areas, the development of paper played very little part in the development of civilization but it certainly played a large part in the spread of it. The founding fathers were in America for more than 100 years before we began to manufacture paper here and having done so, the industry took off like the rockets that would be built a hundred years later.