System for keeping calender rolls of a paper machine clean

Details System for keeping calender rolls of a paper machine clean System for keeping calender rolls of a paper machine clean

2006-12-12

2006-12-12

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

C162S199000, C162S263000, C162S272000, C162S252000, C034S117000, C034S444000, C034S445000, C034S446000, C427S316000

Reexamination Certificate

active

07147754

ABSTRACT:
A system for maintaining calender rolls of a paper machine clean when producing high-gloss paper or coated paper, such as LWC or MWC. To prevent a coating agent, such as coating dye, from adhering onto and soiling a smooth surface of a calender roll, with an overheating phenomenon, the system has a second measurement station (10) provided with measuring and indicator means for producing an output indicating soiledness of the web (W) or a humidity profile. When the output of the second measurement station (10) indicates excessive soiledness or an uneven humidity profile, the system performs at least one of: cleaning the surface of the smooth-surfaced calender roll; changing the nip load in the calender (5); making a correction adjustment of the CD-directional humidity profile of the web (W); cutting the web (W) and conducting it into the pulper; and/or changing the running speed of the web (W).

REFERENCES:
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Search Report issued in Finnish Priority Application No. 20000430.
International Search Report issued in International Patent Application No. PCT/FI01/00175, Aug. 2002.

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