Paper making and fiber liberation – Processes and products – Multi-layer waterlaid webs or sheets
Patent
1987-12-03
1989-12-26
Chin, Peter
Paper making and fiber liberation
Processes and products
Multi-layer waterlaid webs or sheets
162149, 162162, 1621811, 162183, 162189, 162190, D21F 1100
Patent
active
048895946
ABSTRACT:
The invention relates to a method and apparatus for manufacturing paper or like products which contains retention agent and inorganic filler. The retention and technical properties of the paper are enhanced by coflocculating the filler with a cellulosic material having a large specific surface area (fine pulp) prior to introducing floc suspension into the stock, and by subjecting the flocs to a floc size-controlling shearing process in a particular reaction vessel to produce flocs that have a mean particle size within the range of 2-4 mm. The particular reaction vessel used herefor incorporates a mixing zone, a flocculation zone, separator means located between the mixing zone and flocculation zone, a shearing zone and a sedimentation zone.
REFERENCES:
patent: 1880045 (1932-09-01), Richter
patent: 3873418 (1975-03-01), Brax
patent: 3884755 (1975-05-01), Frost
Britt, "Retention of Additives During Sheet Formation", Tappi, 56(3), Mar. 1973, pp. 83-86.
Arvela et al., "Effect of Polyelectrolyte Molecular Weight and Stock Agitation of Filler Retention", Tappi, 58(11), Nov. 1975, pp. 86-89.
Unbehend, "Mechanisms of Soft and Hard Floc Formation in Dynamic Retention Measurement", Tappi, 59(10), Oct. 1976, pp. 74-77.
"Coflocculation of Fines and Filler Particles," Gavelin, Gunnar, Paperi ja Puu--Papper och Tra, No. 11, Sweden, 1985, pp. 649-653.
Chin Peter
Mo och Domsjo Aktiebolag
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