Headbox with support beam on movable duct wall

Details Headbox with support beam on movable duct wall Headbox with support beam on movable duct wall

1989-10-20

1991-07-23

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162347, 162344, D21F 102

Patent

active

050341014

ABSTRACT:
The headbox for a paper making machine includes an outlet duct extending across the machine width. The outlet duct is defined by a fixed duct wall below and by a movable duct wall above which are oriented to converge and define an outlet slot. The movable duct wall is movable by a lifting appliance to adjust the space between the duct walls and also the pressure on the stock suspension passing the outlet slot. The movable duct wall has a duct wall beam disposed on it. A support beam for the movable duct wall extends across the machine. Between the duct wall beam and the support beam is a pressure cushion which acts against the pressure in the outlet duct. The lifting appliance is pivoted on the rigid headbox housing and on the support beam. The lifting appliance meets the movable duct wall beam at its axial end to avoid bending moments on that wall. Alternatively, the lifting appliance meets the support beam axially outward of the axial ends of the movable duct wall and a flexible connection between the movable duct wall and the appliance avoids bending moments on the movable duct wall.

REFERENCES:
patent: 4406740 (1983-09-01), Brieu
patent: 4551204 (1985-11-01), Holik et al.
patent: 4770745 (1988-09-01), Hildebrand et al.
patent: 4783241 (1988-11-01), Egelhof et al.

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