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_________ were introduced in the 1950s for headbox approach systems and were enclosed, pressurized screens of high capacity.

_________ were introduced in the 1950s for headbox approach systems and were enclosed, pressurized screens of high capacity. Correct Answer Pressure screens

Pressure screens were introduced in the 1950s for headbox approach systems and were enclosed, pressurized screens of high capacity which demonstrates the principle of operation as do Plates 30 to 32. One crucial modification was that the reduction in the screen slot width from 0.50 mm (0.020 in.) prior to 1970, which is still utilized for corrugating medium.

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