Apparatus for maintaining the edges of a web in conformity with

Details Apparatus for maintaining the edges of a web in conformity with Apparatus for maintaining the edges of a web in conformity with

1987-11-30

1989-02-28

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34123, F26B 1308

Patent

active

048073717

ABSTRACT:
An apparatus is described for maintaining a first and second lateral edge of web in close conformity with a dryer felt of a papermaking machine. The apparatus includes a first dryer drum which is rotatable about an axis which is parallel to the cross-machine direction of the web. A second dryer drum is rotatable about an axis which is spaced and parallel relative to the axis of the first dryer drum. An intermediate transfer roll has an axis of rotation disposed in a plane parallel to, and between, the axes of the first and second drums such that the web and the felt extend contiguously around the first dryer drum and then around the transfer roll and subsequently around the second drum in a serpentine configuration so that the transfer roll and the felt define therebetween a pocket. A first and second box are disposed within the pocket and adjacent to, respectively, the first and second lateral edges of the web for maintaining a partial vacuum within the pocket adjacent to the respective lateral edges such that the edges are drawn into close conformity with the felt which is disposed between the web and the boxes thereby inhibiting detachment of the respective lateral edges from the felt and subsequent wrinkling of the dried web.

REFERENCES:
patent: 3868780 (1975-03-01), Soininen et al.
patent: 4510698 (1985-04-01), Ely

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