Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1994-05-13
1996-11-26
Czaja, Donald E.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162112, 162301, 162209, 162355, D21F 902, D21F 136
Patent
active
055781705
ABSTRACT:
A tissue web (W), which has improved formation and improved tensile properties but no appreciable deterioration of retention and layer purity, if applicable, in comparison with tissue webs produced in conventional twin wire tissue formers, may be formed in a roll type twin wire former by draining 90-99%, preferably 98-99%, of all drainable water from the slurry while on the forming roll (1), preferably a suction forming roll, the remaining 1-10%, preferably 1-2%, of the drainable water being sufficient to have a substantial amount of the papermaking fibers free in the slurry during an initial phase of a subsequent step, and, downstream of said forming roll (1), draining said remaining 1-10%, preferably 1-2%, from the slurry while vibrating the slurry sufficiently to create a micro-turbulence causing a small scale agitation of the fibers to prevent them from forming any appreciable fibrous web (W) on the two forming fabrics (3; 4) until the water remaining in the slurry is insufficient for allowing the fibers to substantially change their position relative to one another. The vibration frequency is at least 100 Hz, and the vibrations may be provided by a multiblade hydrofoil (7).
REFERENCES:
patent: 4100018 (1978-07-01), Wahren et al.
patent: 4306934 (1981-12-01), Seppanen
patent: 4420370 (1983-12-01), Saad
patent: 4443298 (1984-04-01), Thorp
patent: 4561938 (1985-12-01), Kallmes
patent: 4648943 (1987-03-01), Malashenko et al.
patent: 4687549 (1987-08-01), Kallmes
patent: 4790909 (1988-12-01), Harwood
patent: 4960492 (1990-10-01), Weitzel et al.
patent: 5225043 (1993-07-01), Braun et al.
patent: 5259929 (1993-11-01), Bubik et al.
Evans, John C. W., New twin-wire former designed for maximum fines, solids retention, Pulp & Paper, Dec. 1982, p. 58.
Brochure #S-C 88, Valmet Sym-Concept, front cover, pp. 8-9 and back cover.
Leaflet, Valmet Speed-Former HHS, Gap Former For Rebuilds.
Brochure AMBERTEC Beta Formation Tester.
Erikson Jan A.
Klerelid Ingvar B. E.
Larsson Jan L.
Czaja Donald E.
Fortuna Jos'e A.
Valmet-Karlstad AB
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