Dryer section in a paper machine

Details Dryer section in a paper machine Dryer section in a paper machine

1993-12-29

1995-02-14

Gromada, Denise L.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34117, 34120, 34452, 162193, F26B 300

Patent

active

053883470

ABSTRACT:
A dryer section in a paper machine for drying a paper web, having normal dryer groups with a single-wire draw in which drying cylinders are arranged in an upper row and reversing cylinders in a lower row. The dryer section has at least one inverted dryer groups in which drying cylinders are arranged in a lower row and reversing cylinders are arranged in an upper row. In view of making the dryer section more compact, intensifying the evaporation, reducing the transverse shrinkage of the web, and/or improving the runnability of the web, the drying cylinder and/or the reversing cylinder or roll placed in connection with the transfer over the gap between the groups is/are placed so that its/their height position is displaced as compared with the other cylinders in the same group. In an inverted group, an upper reversing cylinder is arranged in connection with blower devices for drying air for the web. The blowings directed from the blower devices increase the evaporation from the web and/or control the transverse moisture profile in the web.

REFERENCES:
patent: 4202113 (1980-05-01), Kankaanpaa
patent: 4967489 (1990-11-01), Autio
patent: 4972608 (1990-11-01), Ivespaa 34116

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