Enhancing cross-directional stretch and tensile energy absorptio

Details Enhancing cross-directional stretch and tensile energy absorptio Enhancing cross-directional stretch and tensile energy absorptio

1997-01-06

1997-12-09

Bennett, Henry A.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34447, 34445, 34117, 34120, F26B 300

Patent

active

056947020

ABSTRACT:
An unrestrained drying capability is added to an existing series of rotating drying cylinders in a cost- and space-efficient manner to enhance cross-directional (CD) stretch and tensile energy absorption (TEA) in a paper web such as for sack kraft grade paper. High-intensity air glide drying devices are adapted for use in a variety of configurations to provide different levels of unrestrained drying capacity for a pre-existing series of rotating drying rollers. The air glide drying devices carry the paper web on a cushion of air which is heated preferably to 500.degree.-850.degree. F. The sheet moisture content of the paper web during heating in the unrestrained drying section decreases by at least approximately 5%, with an evaporation rate of approximately 15-30 lbm/hr/ft.sup.2. A preferred temperature range of the paper web upon entry to the air glide drying device is 160.degree.-210.degree. F. A pre-heater such as a convection or infrared heater may optionally be employed. A variety of configurations are disclosed to allow a gradual increase in the unrestrained drying capability without requiring extensive retrofitting of existing equipment.

REFERENCES:
patent: 2144919 (1939-01-01), Gautreau
patent: 3171873 (1965-03-01), Fikentscher et al.
patent: 4345385 (1982-08-01), Sando et al.
patent: 5377428 (1995-01-01), Clark
patent: 5505006 (1996-04-01), Wulz et al.

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