Horizontal web-forming apparatus with curved nose forming board

Claim 1

In an apparatus for forming a web from a stock jet stream, including a former for projecting the stock stream from its slice, a single, substantially horizontally arranged, looped forming wire, a breast roll and a forming board, each mounted within the looped forming wire with the forming board directly adjacent the breast roll, the improvement comprising: the forming board includes a curved shoe having a place of impingement of the stock stream, a substantially curved nose surface and a substantially planar downstream surface diverging therefrom; the breast roll is mounted with its upper peripheral surface disposed beneath a plane extending along the downstrem surface; the forming wire extends between the upper peripheral breast roll surface and the nose surface at a small angle of about 1° to about 10° relative to the plane along the downstream surface; the former slice is positioned over the breast roll to project the stock stream onto the forming wire over the forming board at a small angle of about 0° to about 2° thereto at the place of impingement.

Claim 7

An apparatus for forming a web from a stock jet stream, including a former for projecting the stock stream from its slice, a single, substantially horizontally arranged, looped forming wire, a breast roll and a forming board apparatus, both mounted within the looped forming wire with the forming board directly adjacent the breast roll, comprising in combination: the forming board apparatus includes a substantially planar trailing downstream surface and a curved shoe having a place of impingement of the stock stream and a substantially curved nose surface diverging downwardly from the trailing downstream surface in the upstream direction; the breast roll is mounted with its upper peripheral surface disposed beneath a plane extending along the downstream surface; the forming wire extends between the upper peripheral breast roll surface and the nose surface at a small angle of about 1° to about 10° relative to the plane along the downstream surface; the former slice is positioned over the breast roll to project the stock stream onto the forming wire over the curved shoe substantially tangentially at the place of impingement.

Claim 8

An apparatus for forming a web from a stock jet stream, including a former for projecting the stock stream from its slice, a single, substantially horizontally arranged, looped forming wire, a breast roll and a forming board apparatus, both mounted within the looped forming wire with the forming board directly adjacent the breast roll, comprising in combination: the forming board apparatus includes a substantially planar trailing downstream surface and a curved shoe having a place of impingement of the stock stream and a substantially curved nose surface diverging downwardly from the trailing downstream surface in the upstream direction; the breast roll is mounted with its upper peripheral surface disposed beneath a plane extending along the downstream surface; the forming wire extends between the upper peripheral breast roll surface and the nose surface at a small angle of about 1° to about 10° relative to the plane along the downstream surface; the former slice is positioned over the breast roll to project the stock stream onto the forming wire over the curved shoe substantially tangentially at the place of impingement.