Dry-laid web with hollow synthetic fibers

Abstract

The present invention relates to a dry-laid composition comprising: hollow synthetic fiber, absorbent and a binder system. The hollow fiber comprises from about 10 to about 50 percent by weight of said composition. The hollow synthetic fiber has a denier of between about 2 to about 18. The hollow synthetic fiber is selected from the class of polyolefins, polyesters, polyamides, acrylics, as well as mixtures and copolymers thereof. The absorbent comprises from about 40% to about 80% of the weight of said composition. The absorbent is a natural absorbent, or a synthetic absorbent, or a mixture of these. The natural absorbent is selected from the class of wood pulp fluff, cotton, cotton linters, and regenerated cellulose fibers, or a mixture of these. The synthetic absorbent is selected from the class of agar, pectin, guar gum, and synthetic hydrogel polymers. The binder fiber comprises from about 3 to about 15 percent by weight of said composition.

What is claimed is:  
     
         1 . A dry-laid composition comprising: hollow synthetic fiber, absorbent and a binder system.  
     
     
         2 . The composition of  claim 1 , wherein said hollow fiber comprises from about 10 to about 50 percent by weight of said composition.  
     
     
         3 . The composition of  claim 1 , wherein said hollow synthetic fiber has a denier of between about 2 to about 18.  
     
     
         4 . The composition of  claim 1 , wherein said hollow synthetic fiber is selected from the class of polyolefins, polyesters, polyamides, acrylics, as well as mixtures and copolymers thereof.  
     
     
         5 . The composition of  claim 4 , wherein said polyester is polyethylene terephthalate.  
     
     
         6 . The composition of  claim 1 , wherein said binder system is selected from the class of mechanical, chemical, or binder fiber, or a mixture of these.  
     
     
         7 . The composition of  claim 6 , wherein said mechanical bonding is by needle punching or hydroentangling.  
     
     
         8 . The composition of  claim 6 , wherein said chemical bonding is by latex resins or hot melt adhesives.  
     
     
         9 . The composition of  claim 6 , wherein said binder fiber employs low melt polymer fibers or bicomponent fibers  
     
     
         10 . The composition of  claim 9 , wherein said binder fiber comprises from about 3 to about 15 percent by weight of said composition.  
     
     
         11 . The composition of  claim 9 , wherein suitable bicomponent fibers are selected from the class of polyethylene/polypropylene; polyethylene/polyester; polypropylene/polyester; copolyester/polyethylene terephthalate; nylon 6/nylon 6,6; and nylon 6/polyethylene terephthalate.  
     
     
         12 . The composition of  claim 11 , wherein said polyethylene/polyester is a grafted polyethylene/polyethylene terephthalate.  
     
     
         13 . The composition of  claim 1 , wherein said absorbent comprises from about 40% to about 80% of the weight of said composition.  
     
     
         14 . The composition of  claim 1 , wherein said absorbent is a natural absorbent, or a synthetic absorbent, or a mixture of these.  
     
     
         15 . The composition of  claim 14 , wherein said natural absorbent is selected from the class of wood pulp fluff, cotton, cotton linters, and regenerated cellulose fibers, or a mixture of these.  
     
     
         16 . The composition of  claim 14 , wherein said synthetic absorbent is selected from the class of agar, pectin, guar gum, and synthetic hydrogel polymers.  
     
     
         17 . The composition of  claim 16 , wherein said synthetic hydrogel polymers are selected from the class of carboxymethyl cellulose, alkali metal salts of polyacrylic acid, polyacrylamides, polyvinyl alcohol, ethylene maleic anhydride copolymers, polyvinyl ethers, hydroxypropyl cellulose, polyvinyl morpholinone, polymers and copolymers of vinyl sulfonic acid, polyacrylates, polyacrylamides, polyvinyl pyridine, and mixtures of these.  
     
     
         18 . A process of making a dry-laid web comprising: 
 mixing hollow fibers, absorbent, and binder fibers;    depositing said mixture onto a moving conveyor belt;    heating said deposited mixture to a temperature sufficient to melt said binder fibers; and    cooling said web thereby forming a structurally rigid web.    
     
     
         19 . The process of  claim 18 , wherein said hollow fiber comprises from about 10 to about 50 percent by weight of said web.  
     
     
         20 . The process of  claim 18 , wherein said binder fibers are bicomponent fibers.  
     
     
         21 . The process of  claim 18 , wherein said binder fibers comprise from about 3 to about 15 percent by weight of said web.  
     
     
         22 . The process of  claim 18 , wherein said absorbent comprises from about 40 percent to about 80 percent of the weight of said web.  
     
     
         23 . A process of making a rigid dry-laid web comprising: 
 mixing hollow fibers and absorbent fibers;    depositing said mixture onto a surface thereby creating a loose web;    bonding said loose web thereby creating a rigid unitary web.    
     
     
         24 . The process of  claim 23 , wherein said hollow fibers comprise from about 10 to about 50 percent by weight of said web.