Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1995-01-19
1997-09-09
Czaja, Donald E.
Paper making and fiber liberation
Processes and products
Non-fiber additive
162 9, 162183, 162158, 1621811, D21H 1764
Patent
active
056652054
ABSTRACT:
A high level of calcium carbonate filler is added to secondary fiber pulp by in situ attachment to the secondary fibers. The secondary fiber pulp is mixed with an alkaline salt such as calcium oxide or calcium hydroxide and contacted with a reaction gas such as carbon dioxide in a gas-liquid contactor apparatus through efficient mixing in order to precipitate filler material such as calcium carbonate crystal complexes on the secondary fibers. The resulting pulp products have comparable or, in some cases, better brightness, cleanliness, and other sheet properties as compared to filler addition by conventional methods.
REFERENCES:
patent: 1595416 (1926-08-01), Rafsky
patent: 5096539 (1992-03-01), Allan
patent: 5122230 (1992-06-01), Nakajima
patent: 5156719 (1992-10-01), Passaretti
patent: 5215734 (1993-06-01), Kunesh et al.
patent: 5219660 (1993-06-01), Wason et al.
patent: 5223090 (1993-06-01), Klungness et al.
patent: 5275699 (1994-01-01), Allan et al.
Fairchild, George H., "Increased Filler Levels in Alkaline Paper Using PCC Technology", Alkaline Papermaking, A TAPPI PRESS Anthology of Published Papers, pp. 180-185, Atlanta, Georgia (1992).
Amidon Thomas E.
Hart Paul
Patnaik Sanjay
Renard Jean J.
Srivatsa Narendra R.
Czaja Donald E.
Fortuna Jos'e A.
International Paper Company
LandOfFree
Method for improving brightness and cleanliness of secondary fib does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for improving brightness and cleanliness of secondary fib, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for improving brightness and cleanliness of secondary fib will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-66687