All top-felted single-tier drying section with post drying secti

Details All top-felted single-tier drying section with post drying secti All top-felted single-tier drying section with post drying secti

1995-09-08

1997-05-27

Sollecito, John M.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34117, F26B 300

Patent

active

056321015

ABSTRACT:
A drying section for a paper making machine. The drying section includes a plurality of single-tier dryer groups, optionally followed by one or more double-tier groups. To control curl in the final paper product, a moistening device extending over the width of the drying section is provided near the end of the single-tier dryer groups. The moistening device can be divided into various zones to control the profile of the paper. Alternatively, or in addition to the moistening device, a contact-less dryer such as a infrared dryer can be provided after the dryer section, upstream of a calender section of the paper making machine. The moistening device can be provided to moisten the bottom or, optionally, the top side of the paper web. Where a double-tier dryer group is provided, to control curl the upper drying cylinders and the lower cylinders can be provided with different steam pressures to control curl. Alternatively, each of the cylinders can be individually controlled. In accordance with a further embodiment, control of web curl is not accomplished in the main dryer section, but rather in an after dryer section which follows a device such as a coater, size press or the like which rewets the paper web.

REFERENCES:
patent: 3658642 (1972-04-01), Keyes, IV et al.
patent: 4282656 (1981-08-01), Schiel
patent: 5311672 (1994-05-01), Kotitschke et al.
patent: 5416980 (1995-05-01), Iivespaa
patent: 5557860 (1996-09-01), Kotitschke et al.

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