Steam shower for improving paper moisture profile

Details Steam shower for improving paper moisture profile Steam shower for improving paper moisture profile

1980-09-08

1982-05-25

Alvo, Marc S.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

34 54, 34155, 162252, D21F 180, D21F 514, D21F 518

Patent

active

043315100

ABSTRACT:
A steam shower for reducing paper web moisture content variability in the cross machine direction is described. The local dewatering effect of the shower on the moving supported web is controlled by varying its bottom steam discharge area incrementally across the width of the web. In one embodiment the hood is divided across the width of the machine into compartments, each having at least one cross machine direction wall whose bottom edge may be adjusted relative to the rear wall of the hood. A second embodiment has a pleated curtain whose bottom edge is controlled by lever arms with respect to the hood's rear wall. Local adjustments are made based on a comparison of moisture measurements at the finished product reel with the desired level.

REFERENCES:
patent: 3089252 (1963-05-01), Daane et al.
patent: 3726757 (1973-04-01), Dupasquier
patent: 3945881 (1976-03-01), Speidel
patent: 4124941 (1978-11-01), Birke et al.
Chari et al., "Profile Analysis For Evaluation of a Compartmentized Steam box", 1976 Tappi Annual Meeting Preprint, N.Y., Mar. 15-17, 1976.

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