(57) A headbox (10) for delivering stock (11) to a forming surface in a papermaking machine
with the headbox (10) having a slice chamber and a slice opening (16) and having trailing
elements (18,19) positioned in the slice chamber extending transversely of the headbox
with means anchoring the elements (18,19) only at their upstream ends with the donwstream
portion unattached and constructed to be selfpositionable so as to be solely responsive
to forces exerted thereon by the stock flowing toward the slice with the elements
(18,19) having greater structural stiffness in the cross-machine direction so that
the elements (18,19) offer resistance to deflection in a cross-machine direction by
transient pressure variations and offer minimal resistance to deformation of the fluid
flow stream for balancing forces on opposite sides of the elements (18,19) with the
elements (18,19) in one form being laminated with a plurality of anisotropic layers.
|
|
