Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Patent
1996-09-24
1998-06-30
Bennett, Henry A.
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
34117, 34119, D21F 500
Patent
active
057716030
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 calendar 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.
REFERENCES:
patent: 3948721 (1976-04-01), Winheim
patent: 4986009 (1991-01-01), Haessner et al.
patent: 5269074 (1993-12-01), Sims et al.
patent: 5311672 (1994-05-01), Kotitschke et al.
Kotitschke Gerard
Oechsle Markus
Sollinger Hans-Peter
Straub Karlheinz
Bennett Henry A.
Gravini Stephen
Voith Sulzer Papiermashinen GmbH
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