Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber
Patent
1987-01-28
1989-12-05
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With chemical or physical modification of liberated fiber
1621573, D21D 500
Patent
active
048850578
ABSTRACT:
A method for treating synthetic pulp particles, which includes treating a slurry of synthetic pulp particles having a Schopper-Riegler freeness of more than 30.degree.SR by a concentration provided with a rotary filter bed to lower the freeness not more than 30.degree.SR, water-washing the synthetic pulp particles in the state where the freeness is not more than 30.degree.SR, and dispersing the synthetic pulp particles in water to restore the freeness to more than 30.degree.SR.
REFERENCES:
patent: 2999788 (1961-09-01), Morgan
patent: 4013751 (1977-03-01), Davis et al.
patent: 4049492 (1977-09-01), Lare
patent: 4519873 (1985-05-01), Amano et al.
patent: 4724046 (1988-02-01), Yamamoto et al.
European Search Report Appln. No. EP 87 10 0777, with Documents of Interest Attached (4 patents).
Ishimaru Kenji
Kiriyama Tsutomu
Sakamoto Yoshitaka
Sasaki Noriaki
Yamamoto Michio
Chin Peter
Dang Thi
Teijin Limited
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