Patent ID: 7879192
Filing Date: 2011-02-01
Classification: D21F

Abstract:
1. A multiply former apparatus for forming a base, top and intermediate ply, said apparatus comprising: a fourdrinier wire for receiving thereon the base ply; a first twin wire former for forming the intermediate ply, said first former cooperating with said fourdrinier wire; said first former including: a first looped wire cooperating with a second looped wire for defining therebetween a first forming section for forming the intermediate ply, said first forming section having a first and a second end; a vacuum device for urging the intermediate ply to follow said first wire when said first and second wire extend away from each other adjacent to said second end of said first forming section, said first wire being disposed between said first forming section and said vacuum device; a combining roll for guiding said first wire from said second end of said first forming section, said first wire being disposed between said combining roll and said first forming section, said combining roll urging the intermediate ply against the base ply supported by the fourdrinier wire; a second twin wire former for forming the top ply, said second former cooperating with said fourdrinier wire; said second former including: a third looped wire cooperating with a fourth looped wire for defining therebetween a second forming section for forming the top ply, said second forming section having a first and a second extremity; a further vacuum device for urging the top ply to follow said third wire when said third and fourth wire extend away from each other adjacent to said second extremity of said second forming section, said third wire being disposed between said second forming section and said further vacuum device; a further combining roll for guiding said third wire from said second extremity of said second forming section, said third wire being disposed between said further combining roll and said second forming section, said further combining roll urging the top ply against the intermediate ply supported by the fourdrinier wire such that the intermediate ply is disposed between said base and top plies; a vacuum box disposed upstream relative to said further vacuum device such that said fourth wire is disposed between said vacuum box and said third wire, said vacuum box assisting in removing water from said second forming section for increasing a capacity of the apparatus; a primary headbox disposed adjacent to said fourdrinier wire and upstream from said combining roll, said primary headbox ejecting stock onto said fourdrinier wire such that the base ply is formed on said fourdrinier wire upstream relative to said combining roll; a secondary headbox disposed upstream relative to said first end of said first forming section, said secondary headbox ejecting stock onto said second wire such that the stock forms the intermediate ply during formation thereof along said first forming section; and said second wire defining a preforming section upstream relative to said first end of said first forming section.