Method of making wet pressed tissue paper
AssigneeThe Procter & Gamble Company
InventorsRobert Stanley Ampulski, Ward William Ostendorf, Osman Polat
Life of this patent
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Abstract
The present invention provides method for making a wet pressed paper web. An embryonic web of papermaking fibers is formed on a foraminous forming member, and transferred to an imprinting member to deflect a portion of the papermaking fibers in the embryonic web into deflection conduits in the imprinting member. The web and the imprinting member are then pressed between first and second dewatering felts in a compression nip to further deflect the papermaking fibers into the deflection conduits in the imprinting member and to remove water from both sides of the web. The compression nip has an extended length, and can comprise convex and concave opposed compression surfaces.
Claims23
A method of forming a paper web comprising the steps of:
- providing an aqueous dispersion of papermaking fibers;
- providing a foraminous forming member;
- providing a first dewatering felt layer;
- providing a second watering felt layer;
- providing a compression nip having a machine direction length of at least about 3.0 inches, wherein the compression nip comprises convex and concave opposed compression surfaces;
- providing an imprinting member having a web contacting face comprising a web imprinting surface and a deflection conduit portion;
- forming an embryonic web of the papermaking fibers on the foraminous forming member, the embryonic web having a first face and a second face;
- transferring the embryonic web from the foraminous forming member to the imprinting member to position the second face of the embryonic web adjacent the web contacting face of the foraminous imprinting member;
- deflecting a portion of the papermaking fibers in the embryonic web into the deflection conduit portion and removing water from the embryonic web through the deflection conduit portion to form an uncompacted, non-monoplanar intermediate web of the papermaking fibers;
- positioning the web intermediate the first and second felt layers in the compression nip, wherein the first felt layer is positioned adjacent the first face of the intermediate web, wherein the web imprinting surface is positioned adjacent the second face of the intermediate web, and wherein the deflection conduit portion is in flow communication with the second felt layer;
- and
- pressing the intermediate web in the compression nip to form a molded web.
A method of molding a paper web comprising the steps of:
- providing a wet web of papermaking fibers, the paper web having a first face and a second face;
- providing a first dewatering felt layer;
- providing a compression nip having a machine direction length of at least about 3.0 inches, wherein the compression nip comprises convex and concave opposed compression surfaces;
- providing an imprinting member having a first web contacting face and a second face, the web contacting face comprising a macroscopically monoplanar, patterned, continuous network web imprinting surface defining within the foraminous imprinting member a plurality of discrete, isolated, non connecting deflection conduits;
- supporting the second face of the paper web on the web contacting face of the foraminous imprinting member;
- positioning the first dewatering felt layer adjacent the first face of the paper web;
- pressing the paper web, the foraminous imprinting member, and the first dewatering felt layer in the compression nip to form a molded web having a patterned continuous network region having a relatively high density, and a plurality of discrete domes having a relatively low density, the domes being dispersed throughout and isolated one from another by the relatively high density network.
Dependencies are inferred from the claim text.