Process for inhibiting white pitch deposition in papermaking fel

Details Process for inhibiting white pitch deposition in papermaking fel Process for inhibiting white pitch deposition in papermaking fel

1988-07-29

1989-08-29

Chin, Peter

Paper making and fiber liberation

Processes and products

Conditioning, preparing or repairing of apparatus

162DIG4, D21F 132

Patent

active

048614297

ABSTRACT:
This invention relates to a process for inhibiting white pitch deposition in felts of a papermaking system including adding to the felts an effective inhibiting amount of an organic, anionic polyelectrolyte. The molecular weight of the polyelectrolyte is preferably from about 1,000 to 100,000. The polyelectrolyte is selected from the group consisting of polyacrylic acid, polmethacrylic acid, acrylic acid/polyethylene glycol allyl ether copolymers, methacrylic acid/polyethylene glycol allyl ether copolymers, acrylic acid/1-allyloxy-2-hydroxypropane sulfonic acid copolymers. The use of these polyelectrolytes in combination with surfactants provides an especially effective white pitch inhibiting and total felt conditioning process when applied to the felt.

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Latimer, "Predicting `White Pitch` Problems", Tappi, vol.62, No. 5, pp. 29-31, May 1979.
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Edwards, "Wet End Chemical Control Reduces Recycled Coated Stock Problems", Pulp and Paper, pp. 52-54, Feb. 1987.

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