Patent ID: 6113740
Filing Date: 2000-09-05
Classification: D21F,D21H,Y10T

Abstract:
A process for the manufacture of a soft bathroom tissue product having a serpentine configuration and low sidedness, which process comprises:providing a moving foraminous support;providing a stratified headbox adjacent said moving foraminous support adapted to form a nascent web by depositing furnish upon said moving foraminous support, said stratified headbox having at least two plena;providing wet pressing means operatively connected to said moving foraminous support to receive said nascent web and for dewatering of said nascent web by overall compaction thereof;providing a Yankee dryer operatively connected to said moving foraminous support and said moving foraminous support and said wet pressing means and adapted to receive and dry the dewatered nascent web;one plenum of said headbox being adapted to deposit a Yankee-side stratum of furnish on said moving foraminous support such that, during drying of said nascent web, said Yankee-side stratum will engage said Yankee;another plenum of said headbox being adapted to deposit a distal stratum of furnish on said moving foraminous support such that, during drying of said nascent web, said distal stratum will be spaced from said Yankee;supplying a furnish to said one plenum to form said Yankee-side stratum comprising cellulosic papermaking fiber chosen from the group consisting of hardwood, softwood, and recycled fibers and mixtures thereof, and a strength enhancing agent;supplying another furnish to said other plenum to form said distal stratum comprising;cellulosic papermaking fiber chosen from the group consisting of hardwood, softwood, and recycled fibers, and mixtures thereof, and optionally, a strength enhancing agent;the overall concentration of stength enhancing starch in said single-ply bathroom tissue product being from at least about 1 to about 6 lbs/ton;the concentration of strength enhancing agent in said distal stratum being no more than the greater of about 0.5 lbs/ton or 20% of the concentration of strength enhancing agent in the Yankee-side stratum, forming a nascent web by depositing said one furnish sand said other furnish on said foraminous support;wet pressing said nascent web;transferring said nascent web to said Yankee dryer, adhering said web to said Yankee, and creping said web from said Yankee;recovering a creped, dried bathroom tissue product;forming a roll of single-ply tissue;wherein said tissue comprising at least two differentiated strata which do not delaminate from each other and controlling the relative amounts of softwood fibers, recycle fibers, harwood fibers, and strength enhancing starch in each of said strata being selected such that said tissue exhibits;a sidedness parameter of less than 0.3, a tensile modulus of no more than 32 grans/percent strain, a GM MMD friction of no more than about 0.225, and a cross direction dry tensile strength of at least 200 grams per 3 inches.