Cleaning sheet and laminates therefor

Abstract

A multi-ply cleaning sheet. The cleaning sheet has a preferred basis weight/cumulative volume combination. This combination decouples wet cleaning performance from the cost of the sheet associated with the basis weight of the constituent plies. The cleaning sheet may be pre-wetted.

What is claimed is: 
     
         1 . A cleaning sheet suitable for being pre-wetted, said cleaning sheet comprising a first ply and a second ply joined together in a face-to-face relationship to form a laminate, said first ply comprising a floor contacting layer having a basis weight of about 35 gsm to about 50 gsm, a cumulative volume at 204 mm H 2 O of about 2 to about 2.7 cubic millimeters per mg of nonwoven material and said second ply comprising a core layer for holding and releasing a cleaning liquid, said second ply comprising a synthetic nonwoven and/or cellulosic material. 
     
     
         2 . The cleaning sheet of  claim 1 , wherein said second ply has a first face and a second face opposed thereto, and wherein said floor contacting layer is disposed on said first face of said second ply, and wherein said sheet further comprises a third ply backing layer disposed on said second face of said second ply to form a three ply laminate. 
     
     
         3 . The cleaning sheet of  claim 2 , wherein said floor contacting layer comprises a spunbond nonwoven. 
     
     
         4 . The cleaning sheet of  claim 3 , wherein said floor contacting layer comprises a hydroentangled spunbond nonwoven. 
     
     
         5 . The cleaning sheet of  claim 4  wherein said basis weight of said floor contacting layer is about 38 gsm to about 45 gsm. 
     
     
         6 . The cleaning sheet of  claim 4  wherein cumulative volume of said floor contacting layer at 204 mm H 2 O is about 2.3 to about 2.5 cubic millimeters per mg of nonwoven material. 
     
     
         7 . The cleaning sheet of  claim 5  wherein cumulative volume of said floor contacting layer at 204 mm H 2 O is about 2.3 to about 2.5 cubic millimeters per mg of nonwoven material. 
     
     
         8 . The cleaning sheet of  claim 7  wherein said second ply has a basis weight of about 110 gsm to about 160 gsm. 
     
     
         9 . The cleaning sheet of  claim 8  wherein said floor contacting layer and said backing layer comprise substantially identical nonwoven materials. 
     
     
         10 . A cleaning sheet according to  claim 9  which is pre-wetted. 
     
     
         11 . A pre-wetted cleaning sheet comprising:
 a first ply having a basis weight of about 35 gsm to about 50 gsm, a cumulative volume at 204 mm H 2 O of about 2 to about 2.7 cubic millimeters per mg of nonwoven material;   a second ply for holding and releasing a cleaning liquid, said second ply comprising a synthetic nonwoven and/or cellulosic material, said first ply and said second ply being joined together to form a laminate; and   a cleaning solution impregnated in said laminate, said sheet having 6 to 8 grams of cleaning solution per gram of laminate.   
     
     
         12 . The cleaning sheet of  claim 11  further comprising a third ply joined to said second ply, whereby said second ply is disposed between said first ply and third ply, said third ply comprising a synthetic nonwoven. 
     
     
         13 . The cleaning sheet of  claim 12  wherein said second ply comprises at least 50 weight percent cellulose. 
     
     
         14 . The cleaning sheet of  claim 13  wherein cumulative volume of said first ply at 204 mm H 2 O is about 2.3 to about 2.5 cubic millimeters per mg of nonwoven material. 
     
     
         15 . The cleaning sheet of  claim 14  wherein said basis weight of said first ply is about 38 gsm to about 45 gsm. 
     
     
         16 . A pre-wetted cleaning sheet comprising:
 a first ply having a basis weight of about 35 gsm to about 45 gsm, a cumulative volume at 204 mm H 2 O of about 2.3 to about 2.7 cubic millimeters per mg of nonwoven material;   a second ply for holding and releasing a cleaning liquid, said second ply comprising a synthetic nonwoven and/or cellulosic material, said first ply and said second ply being joined together to form a laminate;   a third ply joined to said second ply, whereby said second ply is disposed between said first ply and third ply, said third ply comprising a synthetic nonwoven; and   a cleaning solution impregnated in said laminate.   
     
     
         17 . The cleaning sheet of  claim 16  wherein said first ply and said third ply comprise substantially identical nonwoven materials. 
     
     
         18 . The cleaning sheet of  claim 16  wherein said first ply has a cumulative volume at 204 mm H 2 O of about 2.5 to about 2.7 cubic millimeters per mg of nonwoven material. 
     
     
         19 . The cleaning sheet of  claim 18  wherein said second ply has a basis weight of about 110 gsm to about 160 gsm, and said sheet comprises not more than 10 grams of cleaning solution per gram of laminate. 
     
     
         20 . The cleaning sheet of  claim 19  wherein said first ply comprises a hydroentangled spunbond nonwoven.