Headbox with flexible trailing elements

In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising:

• a flexible element positioned in the slice chamber for stock flow induced movement and extending in the direction of stock flow,
• said element extending transversely of the slice chamber, and
• means supporting said element in the slice chamber with its downstream edge unattached, whereby a fine scale turbulence is produced in the stock without large scale eddies.

In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising:

• a plurality of flexible elements positioned in the slice chamber for stock flow induced movement and extending in the direction of stock flow, and
• means supporting said elements in the slice chamber with their downstream portions unattached, whereby a fine scale turbulence is produced in the stock without large scale eddies.

In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising:

• a plurality of flexible elements positioned in the slice chamber for stock flow induced movement,
• said elements extending transversely of said slice chamber, and
• means supporting said elements in the slice chamber with their downstream edges unattached, whereby a fine scale turbulence is produced in the stock without large scale eddies.

In a headbox for delivering a stream of stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising:

• a plurality of flexible elements positioned in the slice chamber for stock flow induced movement at locations extending transversely of the height of the stock stream, and
• means anchoring said elements at their upstream ends with their downstream portions unattached, whereby a fine scale turbulence is produced in the stock without large scale eddies.

In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising:

• a plurality of trailing elements positioned in the slice chamber for stock flow induced movement,
• each of said elements extending transversely of said headbox, and
• means anchoring said elements only at their upstream ends at locations spaced generally perpendicular to the stock-flow stream with their downstream portions unattached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing towards the slice, whereby a fine scale turbulence is produced in the stock without large scale eddies.

In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising:

• a trailing element positioned in the slice chamber for stock flow induced movement,
• said element extending transversely of said headbox, and means anchoring said element only at its upstream end with its downstream portion unattached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing towards the slice, whereby a fine scale turbulence is produced in the stock without large scale eddies.