Tissue products and methods for manufacturing tissue products

Abstract

In the practice of the invention, a multi-ply paper product or tissue having hardwood layers on the outside and on the inside provides reduced amounts of undesirable sloughing. The multi-ply product includes at least two plies, with three layers in each ply. Hardwood layers, such as for example eucalyptus-containing fiber layers, are provided on the outside surfaces of each ply and also on the interface of one or more plies. The resulting paper product may exhibit reduced sloughing, with little or no sacrifice in softness. A product having two, three, four, or more plies is shown.

What is claimed is:  
     
         1 . A multi-ply tissue product, comprising: 
 (a) a first ply, the first ply comprising: 
 a first hardwood layer,  
 a second hardwood layer, and  
 a softwood layer positioned between the first and second hardwood layers; and  
   (b) a second ply mated to the first ply, the second ply comprising: 
 a first hardwood layer,  
 a second hardwood layer, and  
 a softwood layer positioned between the first and second hardwood layers.  
   
     
     
         2 . The product of  claim 1  in which the total percentage by weight of hardwood in the product is between about 50 and about 80 percent.  
     
     
         3 . The product of  claim 1  in which the total percentage by weight of softwood in the product is between about 20 and about 50 percent.  
     
     
         4 . The product of  claim 1  in which the slough is less than about 7.3 mg at a GMT of between about 500-800 at a softness of between about 8-9.  
     
     
         5 . The product of  claim 1  in which the slough is less than about 6 mg.  
     
     
         6 . The product of  claim 1  in which a debonding agent is applied in the product.  
     
     
         7 . The product of  claim 6  in which debonding agent is applied in at least one hardwood layer.  
     
     
         8 . The product of  claim 6  in which the debonding agent is an imidazoline-containing composition.  
     
     
         9 . The product of  claim 1  in which the softwood fiber is refined.  
     
     
         10 . The product of  claim 1  in which the total amount of hardwood fiber in the product is between about 60 and about 70 percent, and the total amount of softwood fiber in the product is between about 30 and about 40 percent.  
     
     
         11 . The product of  claim 1  in which the total amount of hardwood fiber in the product is about 65%.  
     
     
         12 . The product of  claim 1  in which the hardwood fiber comprises eucalyptus fiber.  
     
     
         13 . The product of  claim 1  in which the softwood fiber comprises northern softwood kraft fiber.  
     
     
         14 . The product of  claim 1 , further comprising: 
 (c) a third ply, the third ply comprising: 
 a first hardwood layer,  
 a second hardwood layer, and  
 a softwood layer positioned between the first and second hardwood layers.  
   
     
     
         15 . The product of  claim 14  further comprising: 
 (d) a fourth ply, the fourth ply comprising: 
 a first hardwood layer,  
 a second hardwood layer, and  
 a softwood layer positioned between the first and second hardwood layers.  
 
 
     
     
         16 . A multi-ply tissue, comprising: 
 (a) a first ply, the first ply comprising: 
 a first hardwood layer,  
 a second hardwood layer, and  
 a softwood layer positioned between the first and second hardwood layers; and  
   (b) a second ply mated to the first ply, the second ply comprising: 
 a first hardwood layer,  
 a second hardwood layer, and  
 a softwood layer positioned between the first and second hardwood layers;  
 wherein the total hardwood content of the tissue is between about 50 and about 80 percent by weight.  
   
     
     
         17 . The tissue of  claim 16  in which the total hardwood content of the tissue is between about 60 and about 70 percent.  
     
     
         18 . The tissue of  claim 17  further comprising a third ply.  
     
     
         19 . The tissue of  claim 18  further comprising a fourth ply.  
     
     
         20 . The tissue of  claim 16  in which the total softwood content of the tissue is between about 30 and about 40 percent.  
     
     
         21 . The tissue of  claim 16  in which a debonding agent is employed in the tissue.  
     
     
         22 . The tissue of  claim 21  in which the debonding agent is employed in one or more of the hardwood layers.