Multi-ply planar absorbent product and process for manufacturing such a product

Abstract

Adhesive (a 1 , a 2 ) as a pattern of deposits is applied on both sides of a hydrophilic spunbond non-woven inner ply (B) of low grammage and no or low adhesion ability. Together with this inner ply (B) a three ply planar absorbent product is made with tissue outer plies (A,C) by exerting pressure on the adhesive such that the adhesive penetrates through the inner ply (B) for achieving ply bonding between the inner ply (B) and the opposite outer ply (C). The different adhesive patterns do not disturb each other because they do not coincide.

1 . Multi-ply planar absorbent product, which comprises at least a first (A) and a second (C) outer tissue ply and at least one inner non-woven ply (B) bonded together, with an adhesive, wherein 
 the inner ply (B) is a material of no or low adhesion ability;    a first adhesive is present on one side of the inner ply (B) in a first pattern of discrete adhesive deposits (al);    a second adhesive is present on the other side of the inner ply in a second pattern of discrete adhesive deposits (a 2 ), wherein said second pattern at least partly does not coincide with the first pattern; and    each of said first and second adhesive penetrates through the inner ply (B) thereby bonding together the inner ply (B) and at least the outer ply (A;C) on the side opposite to the side where the adhesive is applied.    
   
   
       2 . Multi-ply planar absorbent product according to  claim 1 , wherein at least one of the plies is embossed either separately or in unison.  
   
   
       3 . Multi-ply planar absorbent product according to  claim 1 , wherein both of the outer plies (A,C) are embossed.  
   
   
       4 . Multi-ply planar absorbent product according to  claim 3 , wherein the embossment is such that sandwiching the inner ply (B), the outer plies (A,C) are in “foot-to-foot” contact, and the adhesive is present at least in some of the “foot-to-foot” areas.  
   
   
       5 . Multi-ply planar absorbent product according to  claim 3 , wherein the embossment is such that sandwiching the inner ply (B), the outer plies (A,C) are in “nested” contact, and the adhesive is present in at least some of the “nested” areas.  
   
   
       6 . Multi-ply planar absorbent product according to  claim 1 , wherein the adhesive mechanically surrounds fibers of the inner ply (B) according to an interlocking grip.  
   
   
       7 . Multi-ply planar absorbent product according to  claim 1 , wherein the material of the non-woven inner ply (B) is a hydrophilic material.  
   
   
       8 . Multi-ply planar absorbent product according to  claim 7 , wherein the material is a hydrophilic spunbond of low grammage.  
   
   
       9 . Multi-ply planar absorbent product according to  claim 1 , wherein the tissue of the outer plies (A,C) is a through-air-dried (TAD) paper of substantially 18 g/m 2 , and the material of the inner ply (B) is a hydrophilic spunbond non-woven of low grammage of substantially 9 gsm.  
   
   
       10 . Process for manufacturing a multi-ply planar absorbent product, which comprises at least a first and a second outer tissue ply and at least one inner non-woven ply made of a material of low adhesion ability bonded together with an adhesive, said process comprising the steps of: 
 applying adhesive on one side of the inner ply in a first pattern of a discrete adhesive deposits;    applying adhesive on the other side of the inner ply in a second pattern of discrete adhesive; deposits, wherein said second pattern at least partly does not coincide with the first pattern;    placing the first and second tissue plies on those sides of the inner ply carrying the first and second pattern of adhesive respectively; and    pressing together the plies at least in those areas carrying the discrete adhesive deposits to cause them to penetrate through the inner ply, thereby bonding together at least the inner ply and the ply lying opposite to the application side of the respective adhesive deposit.