Liquid-impervious backsheet for body fluids disposal article

Abstract

A liquid-impervious backsheet for body fluids disposal article having upper and lower surfaces made of thermoplastic synthetic resin, the sheet includes a plurality of independent concave zones depressed downward from the lower surface and a smooth zone extending around these concave zones, each of the concave zones being formed in its region except its peripheral edge with at least one micropore.

That is claimed is:  
     
         1 . A liquid-impervious backsheet for body fluids disposal article having upper and lower surface and made of thermoplastic synthetic resin, said liquid-impervious backsheet comprises: 
 said sheet comprising a plurality of independent concave zones depressed downward from said lower surface and a smooth zone extending around said concave zones, each of said concave zones being formed in a region thereof except a peripheral edge thereof with at least one micropore.    
     
     
         2 . The liquid-impervious backsheet according to  claim 1 , wherein at least the upper surface of said sheet is water repellent in said concave zones and at least the upper surface of said sheet is hydrophilic in said smooth zone.  
     
     
         3 . The liquid-impervious backsheet according to  claim 1 , wherein the number of said concave zones per 10 cm 2  of said sheet is in a range of 4˜100, a throat-area of each of said concave zones is in a range of 0.002˜2.0 cm 2 , an intercentral distance of each pair of adjacent said concave zones is in a range of 0.1˜1.5 cm and a height as measured from the lower surface of said sheet to a lower surface of a bottoms in each of said concave zones is in a range of 0.01˜0.3 cm.  
     
     
         4 . The liquid-impervious backsheet according to  claim 1 , wherein a thickness of said sheet is in a range of 10˜100 μm and an inner diameter of each of said micropores is in a range of 0.05˜1.0 mm.