Abstract 1. In a headbox construction for delivering stock to a forming surface, the combination comprising: a slice chamber for receiving stock from a headbox chamber and being tapered in a downstream direction; a slice opening leading from the chamber for discharging stock flowing through the chamber onto a traveling forming surface; a plurality of flexible trailing sheet form elements each extending in a cross-machine direction and being separated to form flow passages therebetween; a plate member having stock flow openings therethrough located at the upstream end of the slice chamber and supporting the upstream ends of the trailing elements, the upstream ends of the trailing elements being anchored to said plate member and the downstream ends being unattached and self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing toward the slice; and a plurality of projections on the surface of said trailing elements substantially uniformly space thereon projecting int the flow steam which flows fast the trailing elements increasing the surface area of the trailing elements exposed to the stock flow stream.
Inventors
👤 R Betley
👤 R Beck
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 06:58
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
In a headbox construction for delivering stock to a forming surface, the combination comprising: a slice chamber for receiving stock from a headbox chamber and being tapered in a downstream direction; a slice opening leading from the chamber for discharging stock flowing through the chamber onto a traveling forming surface; a plurality of flexible trailing sheet form elements each extending in a cross-machine direction and being separated to form flow passages therebetween; a plate member having stock flow openings therethrough located at the upstream end of the slice chamber and supporting the upstream ends of the trailing elements, the upstream ends of the trailing elements being anchored to said plate member and the downstream ends being unattached and self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing toward the slice; and a plurality of projections on the surface of said trailing elements substantially uniformly space thereon projecting int the flow steam which flows fast the trailing elements increasing the surface area of the trailing elements exposed to the stock flow stream.
Claim 2
Dependent Claim
177 words
In a headbox construction for delivering stock to a forming surface, the combination comprising: a slice chamber for receiving stock from a headbox chamber and being tapered in a downstream direction; a slice opening leading from the chamber for discharging stock flowing through the chamber onto a traveling forming surface; a plurality of flexible trailing sheet form elements each extending in a cross-machine direction and being separated to form flow passages therebetween; a plate member having stock flow openings therethrough located at the upstream end of the slice chamber and supporting the upstream ends of the trailing elements, the upstream ends of the trailing elements being anchored to said plate member and the downstream ends being unattached and self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing toward the slice; and a plurality of projections on the surface of said trailing elements substantially uniformly space thereon projecting int the flow steam which flows fast the trailing elements increasing the surface area of the trailing elements exposed to the stock flow stream.