Embossing device for at least two-layered planar products such as toilet paper, tissues, or similar

1. An embossing device ( 10 ) for at least two-layer planar products ( 40 ) such as toilet paper, facial tissue or the like, the embossing device comprising:

at least one first and at least one second roller couple ( 12 , 14 ), each formed from an embossing roller ( 16 , 20 ) and a squeezer ( 18 , 22 ), wherein embossing roller ( 16 ) of first couple ( 12 ) has a plurality of embossing points ( 38 ) uniformly distributed over an entire embossing surface in a number of roughly 20 to roughly 70 per cm 2 , for producing a two-dimensional micro-embossing on at least one layer web ( 24 ), and wherein embossing roller ( 20 ) of second couple ( 14 ) has an embossing surface with a decorative pattern made from a plurality of first areas ( 26 ) having a plurality of embossing points ( 38 ) extending across any given first area ( 26 ) in a number of roughly 45 to roughly 70 per cm 2 to produce a two-dimensional micro-embossing on at least one additional layer web ( 30 ) and second areas ( 28 ) that have no embossing points extending across any given second area ( 28 ), said second areas ( 28 ) being formed into one or more shapes so as to form their own decorative pattern on said embossing surface and being bounded by and located within at least one first area ( 26 ), and having no embossing points between said at least one bounded first area ( 26 ), wherein second areas ( 28 ) constitute not more than 40% of the entire embossing surface and are not interconnected,

with at least one gluing station ( 32 ), which is arranged adjacent to embossing roller ( 20 ) of second couple ( 14 ) and downstream of the corresponding squeezer ( 22 ), and by means of which glue ( 34 ) is applied to elevations on the at least one additional layer web ( 30 ) produced by the embossing points ( 38 ) of embossing roller ( 20 ),

wherein embossing rollers ( 16 , 20 ) are arranged relative to one another forming a nip ( 17 ) to bring the embossed layer webs ( 24 , 30 ) together and

wherein a joining roller ( 36 ) is arranged downstream adjacent to embossing roller ( 20 ) of second couple ( 14 ) to form a layer connection of layer webs ( 24 , 30 ).

2. The embossing device according to claim 1 , characterized in that the gluing station ( 32 ) applies colored glue and/or glue mixed with colorant.

3. The embossing device according to claim 1 , characterized in that the squeezers ( 18 , 22 ) of the first and the second couples ( 12 , 14 ) have a hardness in a range of roughly 50 to roughly 70 Shore A.

4. The embossing device according to claim 1 , characterized in that an embossing pressure of the roller couples ( 12 , 14 ) lies in a range of roughly 4.0 bar to roughly 8.2 bar.

5. The embossing device according to claim 1 , characterized in that a line pressure during embossing by the roller couples ( 12 , 14 ) lies in a range 15 N/mm to roughly 25 N/mm.

6. The embossing device according to claim 1 , characterized in that the embossing points ( 38 ) have a height in a range of roughly 0.7 mm to roughly 1.5 mm.

7. The embossing device according to claim 1 , characterized in that a diameter of the embossing surface of the embossing points ( 38 ) lies in a range of roughly 0.35 mm to roughly 1.7 mm.

8. The embossing device according to claim 1 , characterized in that the embossing points ( 38 ) are shaped in the form of a truncated cone.

9. The embossing device according to claim 8 , characterized in that a plurality of flanks ( 42 ) of the embossing points ( 38 ) are formed at an angle of roughly 8° to roughly 18° with respect to one another.

10. The embossing device according to claim 1 , characterized in that the at least one gluing station is provided with a glue-application roller, and wherein the joining roller ( 36 ) and/or the glue-application roller is formed cylindrically or in a spiral shape.