Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1988-11-09
1990-01-23
Chin, Peter
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
162DIG4, 162 72, D21F 132
Patent
active
048956228
ABSTRACT:
This invention relates to an improved press felt conditioning treatment which controls the deposition of polymerically flocculated particulate substances in a press felt. The treatment comprises applying to the felt an effective inhibiting amount of a conditioner comprising a relatively low molecular weight organic, anionic polymer and at least one hydrophilic, nonionic or anionic surfactant. The polymer preferrably has an acrylic acid or methacrylic acid functionality and is preferrably selected from the group consisting of homopolymers of acrylic acid, a methacrylic acid/polyethylene glycol allyl ether copolymer, a homopolymer of methacrylic acid, an acrylic acid/polyethylene glycol allyl ether copolymer, and an acrylic acid/1-allyloxy-2-hydroxypropane sulfonic acid copolymer. The surfactant is preferrably selected from the group consisting of octyl phenol ethoxylate, nonyl phenol ethoxylate, dodecyl phenol ethoxylate, secondary alcohol ethoxylate, ethoxylated polyoxypropylene glycol, dialkyl phenol ethoxylate, alkyl polyglycoside, dodecylbenzene sulfonic acid and polyoxyethyelene sorbitan monoester. The use of a relatively low molecular weight polymer having an acrylic acid or methacrylic acid functionality in combination with at least one hydrophilic, nonionic or anionic surfactant is especially effective at preventing the deposition of polymerically flocculated particulate substances in a press felt and papermaking machine.
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Casey, Pulp and Paper-Chemistry and Chemical Technology, 3rd Edition, vol. II; 1980; pp 1084-1087.
Barnett Daniel J.
Keen Patricia R.
Khan Abdul Q.
Betz Laboratories Inc.
Boyd Steven D.
Chin Peter
Dang Thi
Ricci Alexander D.
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