Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1990-10-05
1992-06-16
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
100 38, 100 93RP, 100 73, 162206, 162252, 162263, 162DIG10, D21G 100
Patent
active
051222329
ABSTRACT:
The invention provides multiple steam applicators which are used to distribute steam against a web during calendering. The invention includes a primary steam applicator located adjacent a side of the web to which steam is applied. The primary steam applicator has a manifold, a primary inlet valve, and a plurality of steam valves spaced along the primary manifold. Each steam valve regulates a steam flow distributed to a cross-directional section of the web. A secondary steam applicator is located adjacent the side of the web to which steam is applied. The secondary steam applicator has a manifold, a secondary inlet valve, and a plurality of steam valves spaced along the secondary manifold, each steam valve regulating a steam flow distributed to a cross-directional section of the web. A gloss sensor measures the gloss finish of the web. A computer means, responsive to the gloss sensor, computes a cross-directional gloss error by comparing the gloss measurement at each cross-directional section against a predetermined gloss value for the cross-directional section. The computer means also computes a machine-directional gloss error by comparing the average of the gloss measurements against a predetermined average gloss value. A valve control means, responsive to the computer means, adjusts the primary and secondary steam applicator steam valves to minimize the cross-directional gloss error. Finally, a steam pressure controller means, responsive to the computer means, adjusts the primary and secondary inlet valves to minimize the machine-directional gloss error.
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Tappi Journal/Feb., 1986, "Process Control and Automation of Supercalenders" by Hannu Malkie.
Lyman Robert A.
Taylor Bruce F.
Hastings Karen M.
Measurex Corporation
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