Multi-layer sheet of absorbent paper
The present invention relates to a multi-ply sheet including a first ply ( 12 ) and a second ply ( 14 ) each made of tissue paper and each exhibiting a specific surface weight between 12 and 35 g/m 2 , the first ply including a first embossing pattern which is imprinted in first zones ( 16 ) and which has first protrusions ( 18 ) projecting from the inner surface of the first ply and corresponding to alveoles on the outer surface that constitute in particular first arrays, at least part of the protrusions' tops ( 19 ) being linked to the opposite inner surface of the second ply ( 14 ). This sheet is characterized in that the first ply ( 12 ) includes a second embossing pattern constituted by second protrusions ( 38 ) projecting from the first ply's inner surface and of which the height relative to the first protrusions is shallower, the density with respect to area of the second protrusions being greater and at least part of their tops being situated in the same plane as the tops of the first protrusions and at least part of the first ply's second protrusions' tops being linked to the inner surface of the second ply.
1. A multi-ply sheet comprising a first ply and a second ply, each ply being made of tissue paper and exhibiting a specific surface weight between 12 and 35 g/m 2 , the first ply comprising a first embossing pattern in first zones including first protrusions projecting from an inner surface of the first ply and having corresponding alveoles on an opposite side, said first protrusions having tops of which at least more than one is connected to an opposite inner surface of the second ply, and wherein said first ply further comprises a second embossing pattern including second protrusions projecting from the inner surface of the first ply, said second protrusions having a height (H 2 ) which is less than a height (H 1 ) of said first protrusions and a density which is greater than that of said first protrusions, and at least more than one top of said second protrusions being situated in a plane also containing tops of the first protrusions and being connected to an inside surface of the second ply.
2. Multi-ply sheet as claimed in claim 1 , wherein the first protrusions configured in the first zones have a density between 6-20 protrusions/cm 2 .
3. Multi-ply sheet as claimed in claim 1 , wherein the second protrusions are configured in second zones and have a density between 30-80 protrusions/cm 2 .
4. Sheet as claimed in claim 2 or 3 , wherein the first zones and the second zones are adjacent.
5. Sheet as claimed in claim 1 , further comprising third protrusions configured as partitions linking two adjacent first protrusions.
6. Sheet as claimed in claim 1 , wherein the second ply is made by a through-air-drying method.
7. Sheet as claimed in claim 1 , wherein the second ply is unembossed.