Method and device for reducing disturbances during paper web formation

Claim 3

The method of claim 1 including creating microturbulence in said fiber suspension during the initial portion of said formation of said paper web within said space between said flexible lip and said travelling paper web-forming surface, said flexible lip extending well beyond the location at which said microturbulence is created in said fiber suspension.

Claim 4

The method of claim 1 including injecting a plurality of streams of said fiber suspension onto said upper surface of said travelling paper web-forming surface, and maintaining a plurality of said flexible lips proximate to said upper surface of said travelling paper web-forming surface, each of said plurality of flexible lips corresponding to one of said plurality of streams of fiber suspension and corresponding to increasing portions of said portion of said predetermined distance corresponding to said space between said flexible lip and said travelling paper web-forming suspension, thereby forming a paper web comprising several layers.

Claim 5

Apparatus for forming a paper web from a fiber suspension comprising a travelling paper web-forming surface including an upper surface and a lower surface, said travelling paper web-forming surface being free of supports for a predetermined distance therealong, said predetermined distance including a first portion and a second portion; head box means including a slice opening located substantially adjacent to said predetermined distance for injecting a stream of said fiber suspension onto said upper surface of said travelling paper web-forming surface at a point upstream of said predetermined distance; flexible lip means projecting from said slice opening and proximate to only said first portion of said predetermined distance of said travelling paper web-forming surface, thereby creating a paper web-forming surface therebetween; and suction box means providing suction to said lower surface of said travelling paper web-forming surface throughout said first and second portions of said predetermined distance, thereby substantially entirely forming said paper web and substantially dewatering said fiber suspension within said paper web-forming space, further dewatering said fiber suspension in the portion of said suction box means corresponding to said second portion of said travelling web-forming surface, and substantially reducing disturbances during the formation of said paper web and throughout said predetermined distance.

Claim 6

Apparatus for forming a paper web from a fiber suspension comprising a travelling paper web-forming surface including an upper surface and a lower surface, said travelling paper web-forming surface being free of supports for a predetermined distance therealong, said predetermined distance including a first portion and a second portion; head box means including a slice opening located substantially adjacent to said predetermined distance for injecting a stream of said fiber suspension onto said upper surface of said travelling paper web-forming surface at a point upstream of said predetermined distance; flexible lip means projecting from said slice opening and proximate to only said first portion of said predetermined distance of said travelling paper web-forming surface, thereby creating a paper web-forming surface therebetween; and suction box means providing suction to said lower surface of said travelling paper web-forming surface throughout said first and second portions of said predetermined distance, thereby substantially entirely forming said paper web and substantially dewatering said fiber suspension within said paper web-forming space, further dewatering said fiber suspension in the portion of said suction box means corresponding to said second portion of said travelling web-forming surface, and substantially reducing disturbances during the formation of said paper web and throughout said predetermined distance.

Claim 7

The apparatus of claim 4 wherein said paper web-forming space comprises a first section of said predetermined distance of said travelling paper web-forming surface, and the remaining portion of said predetermined distance downstream from said flexible lip means comprises a second section of said predetermined distance, and wherein said second section of said predetermined distance comprises a distance of at least 10% of said first section of said predetermined distance.

Claim 8

The apparatus of claim 4 wherein said flexible lip means includes a smooth lower surface in contact with said paper web-forming space.

Claim 9

The apparatus of claim 4 wherein said flexible lip means includes microturbulence forming means on the lower surface thereof in contact with an initial portion of said paper web-forming space, said flexible lip means extending well beyond the location of said microturbulence forming means.

Claim 10

The apparatus of claim 4 including dewatering strips in contact with said lower surface of said travelling paper web-forming surface at the initial portion of said paper web-forming surface and immediately prior to said predetermined distance.

Claim 11

The apparatus of claim 4 including a plurality of said slice openings for injecting a plurality of streams of said fiber suspension onto said upper surface of said travelling paper web-forming surface, and a plurality of said flexible lip means projecting from corresponding ones of said plurality of slice openings and proximate to increasing portions of said portion of said predetermined distance of said travelling paper web-forming surface, thereby forming a paper web comprising several layers.