FIELD: process engineering.
SUBSTANCE: invention covers forming ply of forming tape for forming fibrous web by compaction of said web at paper making machine press part. Nonwoven forming ply has side bearing the web with surface comprises recesses or ledges for processing fibrous web to create surface 3D structure. Said ledges or recesses are distributed over web bearing side to make 20-80% of said surface. Every recess or ledge features size of 0.25-2.5 mm in first direction of the surface upper area plane or surface lower area and size of 0.25-2.0 mm in second direction at surface upper area plane or surface lower area. Note here that said directions extend at right angle to each other. Note also that every recess or ledge feature mean depth or mean height of d 0.05-0.6 mm when forming layer is compacted. Also it features area a equal to 0.3-4.0 mm2 at measurement made at surface upper area plane or surface lower area. Note also that forming ply is water-permeable while recess and ledges are made at said ply.
EFFECT: production of plump hygienic paper, power savings.
37 cl, 18 dwg
