Disposable diapers

Abstract

Disposable absorbent diapers are provided with improved comfort, fit and liquid transportation. The absorbent core of the disposable absorbent diapers includes at least one absorbent structure having a substrate layer and an absorbent layer with channels.

What is claimed is: 
     
         1 . An absorbent article having a backsheet, a topsheet and an absorbent core disposed therebetween, wherein the absorbent core comprising an absorbent material and at least one longitudinally-extending channel substantially free of absorbent material and wherein the absorbent material comprises superabsorbent polymers; the article further comprising:
 a waistband disposed in a back waist region, and   a fastening system having a fastening tab joined to a back waist region and a landing zone,   wherein the landing zone forms a part of a front waist region, wherein the fastening tab can be releasably engaged with the landing zone.   
     
     
         2 . The absorbent article of  claim 1 , wherein the backsheet comprises a liquid impermeable film. 
     
     
         3 . The absorbent article of  claim 1 , further comprising an acquisition system between the topsheet and the absorbent core. 
     
     
         4 . The absorbent article of  claim 1 , wherein the absorbent material defines an absorbent material deposition area in the plane formed by the transversal axis and the longitudinal axis, wherein the absorbent material deposition area comprises a front edge, a back edge and two longitudinal side edges and is further shaped so that its width in the transversal direction varies along the position on the longitudinal axis. 
     
     
         5 . The absorbent article of  claim 4 , wherein the width of the absorbent material area is maximum at the front edge and/or at the back edge of the absorbent material area, and is minimum at a longitudinal position between the front edge and the back edge of the absorbent material area. 
     
     
         6 . The absorbent article of  claim 1 , wherein the absorbent core comprises a pair of channels disposed symmetrically relative to the longitudinal axis. 
     
     
         7 . The absorbent article of  claim 6 , wherein these channels are straight and parallel to the longitudinal axis. 
     
     
         8 . The absorbent article of  claim 6 , wherein these channels are inwardly curved towards the longitudinal axis so that the channels have a closest distance and a farthest distance measured in the transversal direction, wherein the closest distance is disposed in a crotch region. 
     
     
         9 . The absorbent article of  claim 1 , wherein the at least one channel has at least partially a width of from about 3 mm to about 18 mm. 
     
     
         10 . The absorbent article of  claim 1 , wherein the absorbent core comprises a first substrate layer and a second substrate layer and wherein the first substrate layer is bonded to the second substrate layer through the at least one channel. 
     
     
         11 . The absorbent article of  claim 10 , wherein the first substrate layer and second substrate layers are adhesively bonded. 
     
     
         12 . The absorbent article of  claim 1 , wherein the absorbent material comprises cellulose. 
     
     
         13 . A method for making an absorbent structure for use in a disposable absorbent article, the method comprising the steps of:
 a. providing a moving endless surface comprising an absorbent layer-forming reservoirs having one or more substantially longitudinally extending raised strips;   b. providing a supply of absorbent material comprising superabsorbent polymer particulate material and cellulosic material;   c. depositing a portion of the supply of absorbent material into the reservoir;   d. removing absorbent material residing directly above the one or more raised strips;   e. associating the portion of the supply of absorbent material with a first substrate layer and a second substrate layer to define an absorbent structure comprising a channel therein corresponding to the one or more raised strips; and   f. bonding the first substrate layer to the second substrate layer through the channel, wherein the channel is substantially free of the absorbent material.   
     
     
         14 . The method of  claim 13 , wherein the first substrate layer is bonded to the second substrate layer via glue. 
     
     
         15 . The method of  claim 13 , wherein the first substrate layer is bonded to the second substrate layer via ultrasonic bonding. 
     
     
         16 . The method of  claim 13 , wherein the first substrate layer is bonded to the second substrate layer via heat bonding. 
     
     
         17 . The method of  claim 13 , wherein the first substrate layer is continuously bonded to the second substrate layer in the channel. 
     
     
         18 . The method of  claim 13 , wherein the first substrate layer is intermittently bonded to the second substrate layer in the channel. 
     
     
         19 . The method of  claim 13 , wherein the bonding of the first substrate layer to the second substrate layer in the channel is permanent. 
     
     
         20 . The method of  claim 13 , wherein the one or more raised strips comprise an average width W of at least 4% of an average width of the reservoir, and an average length L of 5% to 30% of an average longitudinal dimension of the reservoir.