Paper forming roll construction

Details Paper forming roll construction Paper forming roll construction

1979-05-17

1980-12-23

Chin, Peter

Paper making and fiber liberation

Apparatus

Apparatus repair, cleaning or conditioning

162276, 162357, D21F 160

Patent

active

042408717

ABSTRACT:
Paper forming roll comprising: a stationary pressure box; a rotatable foraminous shell extending around the box; paper making wire; spacing members extending between the box and shell, the spacing members being secured to the box; a plurality of circumferentially extending zones defined by the box, the shell, and the spacing members; wherein a first one zone is a forming zone, a second zone is a primary holding zone, a third zone is a transfer zone, and at least a fourth zone is a secondary holding zone; the box including a plurality of external and internal walls defining a plurality of pressure chambers, a first one of the external walls including ports providing communication between the forming zone and a first one of the pressure chambers from which vacuum for forming purposes may be achieved, a second one of the external walls extending generally vertically from one end of the first one of the external walls to partially define the primary holding zone, the generally vertical wall also including ports providing communication between the primary holding zone and a second one of the pressure chambers; and a drip element extending generally parallel to the generally vertical wall from a circumferential extension of the first one of the external walls adjacent the upper end of the generally vertical wall whereby water containing fibers finding its way into the primary holding zone past the spacing members dividing the forming zone and the primary holding zone will readily fall with fibers entrained therein to the lower inner surface of the shell without impinging upon or adhering to the pressure box.

REFERENCES:
patent: 2509296 (1950-05-01), Goldsmith
patent: 2680996 (1954-06-01), Brown
patent: 2772606 (1956-12-01), Kelly
patent: 3111454 (1963-11-01), Tucker et al.
patent: 3265559 (1966-08-01), Means
patent: 4058435 (1977-11-01), Williams
patent: 4139412 (1979-02-01), Printz

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