Paper machine with twin-wire former

Paper making and fiber liberation – Apparatus – Apparatus repair – cleaning or conditioning

Patent

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Details

162301, 162306, 162307, D21F 100, D21F 900

Patent

active

041135563

ABSTRACT:
A paper machine has a pair of endless wire loops respectively having elongated portions which travel together upwardly along a common path where the wire loops form a twin-wire former. This common path has a lower receiving end for receiving pulp stock from which a web is to be formed and an upper discharge end from which a web issues from the twin-wire former while being transported by one of the endless wire loops beyond the discharging end of the common path. A lower forming roll around which the endless wire loops are lapped determines the lower receiving end of the common path as well as an initial portion of the common path along which the wire loops travel together. An upper forming roll is also lapped by the endless wire loop and determines the discharge end of the common path as well as a final portion thereof. The lower and upper forming rolls cooperate with the endless wire loops to provide at the lower and upper forming rolls dewatering which at least in part occurs in opposite directions at the lower and upper forming rolls, respectively. At least the lower forming roll has a solid shell through which fluid cannot penetrate with the lower forming roll cooperating with the endless wire loops to provide at the lower forming roll a dewatering which takes place at least to a substantial extent in a direction outwardly away from the lower forming roll.

REFERENCES:
patent: 2730933 (1956-01-01), Reynolds
patent: 2843025 (1958-07-01), Holden
patent: 3311533 (1967-03-01), De Montigny et al.
patent: 3595745 (1971-07-01), Cronin
patent: 3726758 (1973-04-01), Parker et al.
patent: 3846232 (1974-11-01), Kankaanpaa
patent: 3996098 (1976-12-01), Kankaanpaa
patent: 3997390 (1976-12-01), Kankaanpaa

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