Multi-ply paper products having a first stratified base sheet and a second stratified base sheet

A multi-ply paper product comprising:

• a first ply including a first stratified base sheet, the first stratified base sheet having at least two layers, one of the at least two layers being an inner layer, and another of the at least two layers being an outer layer comprising papermaking fibers, less than about twenty percent of the papermaking fibers in the outer layer being hardwood fibers and the remainder being northern softwood fibers, the outer layer including a wet strength resin and the inner layer being substantially free of the wet strength resin;
• and
• a second ply including a second stratified base sheet, the second stratified base sheet having at least two layers, one of the at least two layers being an inner layer, and another of the at least two layers being an outer layer comprising papermaking fibers, less than about twenty percent of the papermaking fibers in the outer layer being hardwood fibers and the remainder being northern softwood fibers, the outer layer including a wet strength resin and the inner layer being substantially free of the wet strength resin,
• wherein the first ply and the second ply are arranged such that the inner layer of the first ply is adjacent to the inner layer of the second ply and the inner layer of the first ply is attached to the inner layer of the second ply.

A method of making a multi-ply fibrous sheet, the method comprising:

• providing, from a first furnish including a primary pulp having papermaking fibers, a first ply including a first stratified base sheet, the first stratified base sheet having at least two layers, one of the at least two layers being an inner layer, and another of the at least two layers being an outer layer comprising papermaking fibers, at least about eighty percent of the papermaking fibers in the outer layer being softwood fibers, the softwood fibers of the outer layer having (i) a weight-weighted average fiber length between about two and seven tenths millimeters and about three millimeters and (ii) a coarseness of about sixteen milligrams per one hundred meters or lower, the outer layer including a wet strength resin and the inner layer being substantially free of the wet strength resin;
• providing, from a second furnish including a pulp having papermaking fibers, a second ply including a second stratified base sheet, the second stratified base sheet having at least two layers, one of the at least two layers being an inner layer, and another of the at least two layers being an outer layer comprising papermaking fibers, at least about eighty percent of the papermaking fibers in the outer layer being softwood fibers, the softwood fibers of the outer layer having (i) a weight-weighted average fiber length between about two and seven tenths millimeters and about three millimeters and (ii) a coarseness of about sixteen milligrams per one hundred meters or lower, the outer layer including a wet strength resin and the inner layer being substantially free of the wet strength resin;
• forming a nascent web having at least two layers by arranging the first ply and the second ply such that the inner layer of the first ply is adjacent to the inner layer of the second ply and the inner layer of the first ply is attached to the inner layer of the second ply;
• dewatering the nascent web to form a dewatered web;
• and
• drying the dewatered web to form the multi-ply fibrous sheet.

A method of making a multi-ply fibrous sheet, the method comprising:

• providing, from a first furnish including a primary pulp having papermaking fibers, a first ply including a first stratified base sheet, the first stratified base sheet having at least two layers, one of the at least two layers being an inner layer, and another of the at least two layers being an outer layer comprising papermaking fibers, less than about twenty percent of the papermaking fibers in the outer layer being hardwood fibers and the remainder being northern softwood fibers, the outer layer including a wet strength resin and the inner layer being substantially free of the wet strength resin;
• providing, from a second furnish including a pulp having papermaking fibers, a second ply including a second stratified base sheet, the second stratified base sheet having at least two layers, one of the at least two layers being an inner layer, and another of the at least two layers being an outer layer comprising papermaking fibers, less than about twenty percent of the papermaking fibers in the outer layer being hardwood fibers and the remainder being northern softwood fibers, the outer layer including a wet strength resin and the inner layer being substantially free of the wet strength resin;
• forming a nascent web having at least two layers by arranging the first ply and the second ply such that the inner layer of the first ply is adjacent to the inner layer of the second ply and the inner layer of the first ply is attached to the inner layer of the second ply;
• dewatering the nascent web to form a dewatered web;
• and
• drying the dewatered web to form the multi-ply fibrous sheet.