Paper making and fiber liberation – Processes and products – Plural fiber containing
Patent
1994-03-31
1996-04-09
Chin, Peter
Paper making and fiber liberation
Processes and products
Plural fiber containing
162147, 1621683, 1621811, 1621812, 162183, 162190, 162198, 162DIG11, D21H 2106
Patent
active
055058191
ABSTRACT:
A pulp furnish containing predominantly wood-containing fibers (mechanical) and natural calcium carbonate as a filler is formed into a paper in a paper forming section of a paper machine at a neutral pH in the range of 6.7 to 7.5. Bentonite plus a suitable polymer such as a polyacrylamide produces a pulp stock that has exceptionally high drainage characteristics particularly when used with chalk as the filler. The pH of the stock in the headbox is maintained at the desired level of pH 6.7-7.3 by monitoring the pH in the headbox and adjusting the flow of pH reducing and buffering agent, preferably phosphoric acid, into the pulp prior to the headbox to obtain the desired pH in the stock.
REFERENCES:
patent: 4470877 (1984-09-01), Johnstone et al.
patent: 4913775 (1990-04-01), Langley et al.
patent: 5126014 (1992-06-01), Chung
patent: 5156719 (1992-10-01), Passaretti
patent: 5234548 (1993-08-01), Hatton
patent: 5378322 (1995-01-01), Hornsey
De Witt James A.
Eadie Donald T.
Hayes Gordon R.
Monahan Robert E.
Chin Peter
MacMillan Bloedel Limited
Rowley C. A.
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