Steam shower for adjusting paper moisture profile

Details Steam shower for adjusting paper moisture profile Steam shower for adjusting paper moisture profile

1978-11-29

1981-02-10

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

34 34, 34 54, 34155, 162207, 162252, 162DIG6, D21F 180, D21F 514, D21F 518

Patent

active

042499925

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: 4124941 (1978-11-01), Birke et al.
Chari et al., "Profile Analysis for Evaluation of a Compartmentized Steam Box" Tappi Annual Meeting Preprint, N.Y., Mar. 15-17, 1976.

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