Forming fabric for use in producing a high bulk paper web

In a papermaking machine for the manufacture of a paper web having a basis weight of between about 5 and about 45 lb./3000 ft.sup.2 from a pulp of cellulosic fibers suspended in a flowable medium, employing a forming fabric onto one surface of which said pulp is deposited and liquid is withdrawn from said pulp through the thickness of said forming fabric to cause said fibers to be captured as a web on said forming fabric, said web exhibiting a plurality of nubs projecting from one surface thereof and having enhanced bulk, the improvement comprising a forming fabric disposed on said papermaking machine for receipt of said pulp thereon, said forming fabric including a first plurality of warp yarns woven with a first plurality of shute yarns to define a first layer of said woven yarns having a mesh size which is sufficiently small as to prevent the passage of a material quantity of said cellulosic fibers through the thickness thereof in the coarse of the withdrawal of said liquid medium from said pulp on said forming fabric, and a second plurality of warp yarns woven with a second plurality of shute yarns to define a second layer of said woven yarns that is disposed in overlying relationship to said first layer and which receives said pulp thereon, said first and second layers being united by means of one or more yarns being common to said first and second layers, said second warp and shute yarns being of materially larger individual diameters than said first warp and shute yarns, said second warp and shute yarns being of materially larger individual diameters than said first warp and shute yarns, said second warp and shute yarns defining the perimetral dimensions of a plurality of pockets within said second layer, the bottoms of said pockets being defined by said first layer, each of said pockets being of a depth and of a lateral dimension that are each less than the average length of said cellulosic fibers of said pulp whereby when said pulp is deposited on said forming fabric and at least substantial portions of said liquid in said pulp has been withdrawn from said pulp through the thickness of said forming fabric less than a majority of individual ones of said fibers are disposed in each of said pockets having a portion of the length of individual said fibers which is not disposed in each of said pockets overlaying a yarn which defines the perimetral dimension of each of said pockets, and insufficient numbers of or portions of said fibers are entangled with said yarns of said forming fabric to cause said web to be nonreleasable from said forming fabric at a web consistency of about 20%.