Method for producing an extensible paper having a three-dimensional pattern

Abstract

Method of producing a paper having a three dimensional pattern which has been given the paper web in connection with drying the paper web, at which the wet paper web ( 10 ) is passed through at least one press nip ( 12 ) comprising a rotatable roll ( 13 ) which is heated and that the paper web during the passage through the press nip is given said three dimensional pattern either by means of a pattern provided on the heated roll ( 13 ), alternatively on a member surrounding the roll or by means of a patterned wire, band or belt and where said pattern is pressed into the paper web against a counter means ( 11,14 ). After said press nip ( 12 ) the paper web ( 10 ) is taken off from the heated roll ( 13 ) by means of a detaching roll ( 16 ) and is creped against said detaching roll.

1 . Method of producing a paper having a three dimensional pattern of alternating raised and recessed portions, which has been provided in connection with drying of the paper web, at which the wet paper web ( 10 ) is passed through at least one press nip ( 12 ) comprising a rotatable roll ( 13 ) which is heated and that the paper web during the passage through the press nip is given said three dimensional pattern either by means of a pattern provided on the heated roll ( 13 ), alternatively on a member surrounding the roll or by a patterned wire, band or belt and where said pattern is pressed into the paper web against a counter means ( 11 , 14 ),  
       characterized in 
 that the paper web ( 10 ) after said press nip ( 12 ) is taken off from the heated roll ( 13 ) by means of a detaching roll ( 16 ) and that the paper web is creped against said detaching roll.  
 
     
     
         2 . Method as claimed in  claim 1 ,  
       characterized in 
 that the paper web ( 10 ) between the press nip ( 12 ) and the detaching roll ( 16 ) is led around a part of the periphery of the heated roll ( 13 ) in order to provide an after-drying of the paper web while this is still in contact with the three-dimensional pattern of the roll( 13 ).  
 
     
     
         3 . Method as claimed in  claim 1  or  2 ,  
       characterized in 
 that the detaching roll ( 16 ) is heated and that final drying of the paper web takes place on the detaching roll.  
 
     
     
         4 . Method as claimed in any of the preceding claims,  
       characterized in 
 that the counter means ( 11 ,  14 ) is provided with a non-rigid surface so that the paper web is given a three dimensional structure having a total thickness greater than the thickness of the unpressed paper web.  
 
     
     
         5 . Method as claimed in  claim 4 ,  
       characterized in 
 that the paper web is supported by a compressible press felt ( 11 ) through the press nip ( 12 ), said press felt makes said non-rigid counter means.  
 
     
     
         6 . Method as claimed in  claim 5 ,  
       characterized in 
 that the press felt ( 11 ) is pressed against a resilient surface ( 14 ) in the press nip ( 12 ).