Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1999-04-14
2000-10-03
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162211, 162350, 162352, D21F 154, D21F 152
Patent
active
061267864
ABSTRACT:
A method and apparatus for generating turbulence in stock to deflocculate the stock in an open surface forming section of a paper making machine comprises a dewatering box providing vacuum assisted drainage and which has a set of dewatering elements that impart turbulence into relatively thick stock layers carried at machine operating speeds of equal up to about 400 m/min, for the production of paper products having a basis weight generally in excess of about 160 gsm. Each set of elements includes a lead-in element, at least one intermediate element, and a trailing element. The path of the forming fabric is deflected downwardly as it passes over the intermediate elements, which are inclined at an angle of from about 0.25.degree. to about 10.degree. from a plane defined by forming fabric supporting surfaces on the lead-in and riser elements. This vertical movement initiates turbulence and agitation in the stock, which acts both to deflocculate the stock and to diminish the possibility of sheet sealing. The apparatus is useable in combination with other known formation and drainage devices which are located either upstream or downstream to augment their performance with thicker, slower moving stock layers.
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McPherson Douglas R.
Pitt Richard E.
White James D.
Hastings Karen M.
Wilkes Robert A.
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