Stable Fiber Laminate, and Method and Device for the Production Thereof

Abstract

The invention relates to a fiber laminate comprising two supporting fleeces and an absorptive fiber material which is disposed between the two supporting fleeces and is strengthened by means of a hydroentanglement process. Also disclosed are a method and a device for producing such a fiber laminate. The inventive fiber laminate is provided with sufficient stability against delamination and great absorptive capacity. Zones with absorptive fiber material and zones in which the two supporting fleeces are in direct contact with each other are provided between the two supporting fleeces across the area of the fiber laminate such that zones are created in which the two supporting fleeces forming the outer layers are directly connected to each other

1 . Fiber laminate which comprises two carrier webs ( 1 ,  3 ) and absorptive fiber material ( 2 )
 inserted between the two carrier webs ( 1 ,  3 ) and is bonded by hydroentanglement, characterized in that, seen over the surface of the fiber laminate, there are areas ( 12 ) with absorptive fiber material ( 2 ) between the two carrier webs ( 1 ,  3 ) and areas ( 13 ) where the two carrier webs ( 1 ,  3 ) come into direct contact.   
     
     
         2 . Fiber laminate according to  claim 1 , characterized in that the carrier webs ( 1 ,  3 ) independently of each other are formed either as a layer of spunbond web or a staple fiber layer. 
     
     
         3 . Fiber laminate according to  claim 1  or  2 , characterized in that the absorptive fiber material ( 2 ) consists of a pulp layer or a super-absorbent layer. 
     
     
         4 . Fiber laminate according to one of the preceding claims, characterized in that the carrier webs ( 1 ,  3 ) are pre-bonded in dry condition. 
     
     
         5 . Fiber laminate according to one of the preceding claims, characterized in that the areal weight of the carrier webs ( 1 ,  3 ) lies between 3 and 18 g/cm2, and in particular between 6 and 10 g/cm2. 
     
     
         6 . Fiber laminate according to one of the preceding claims, characterized in that the average areal weight of the absorptive fiber material ( 2 ) lies between 8 and 100 g/cm2, and in particular between 20 and 50 g/cm2. 
     
     
         7 . Fiber laminate according to one of the preceding claims, characterized in that the areas ( 12 ) with absorptive fiber material ( 2 ) between the two carrier webs ( 1 ,  3 ) provide the fiber laminate with a knobbed structure. 
     
     
         8 . Method for production of a fiber laminate comprising two carrier webs ( 1 ,  3 ) and absorptive fiber material ( 2 ) inserted between the two carrier webs ( 1 , 3 ), wherein the fiber laminate is bonded by hydroentanglement over a structuring perforated template ( 4 ), characterized in that the absorptive fiber material ( 2 ) is washed away from the sides of the webs ( 7 ) by the water jet treatment in the direction of the openings ( 6 ) of the template ( 4 ). 
     
     
         9 . Apparatus for production of a fiber laminate comprising two carrier webs ( 1 ,  3 ) and absorptive fiber material ( 2 ) inserted between the two carrier webs ( 1 , 3 ), including a device bonding the fiber material ( 2 ) by hydroentanglement, characterized in that the device comprises a structuring perforated template ( 4 ) with openings ( 6 ) having diameters between 0.5 and 20 mm. 
     
     
         10 . Apparatus according to  claim 9 , characterized in that the perforated template ( 4 ) is designed as structuring drum shell. 
     
     
         11 . Apparatus according to  claim 9 , characterized in that the perforated template ( 4 ) is designed as structuring endless belt.