Method for producing a multi-ply web of flexible material, such as paper and nonwoven, and multi-ply material produced by the method

[0029]FIG. 1 shows a device for producing a three-ply material, e.g. paper, especially tissue paper. A first paper web 1 is fed over a roll 2 towards a glue application station. This comprises a glue chamber 3 from which glue is applied on a glue roll 4. The glue roll 4 is in contact with a first patterned glue transfer roll 5, which along its periphery is provided with a pattern of protuberances 6. The glue roll 4 is only contacting the tops of the protuberances 6, so that glue is only applied thereon. The paper web 1 is passed into a press nip between the first glue transfer roll 5 and a centrally placed impression roll 11. Glue will thus be applied to the first paper web 1 in a first glue pattern corresponding to the configuration of the tops of the protuberances 6. The pressure in the press nip between the pattern roll 5 and the impression roll 11 is only sufficiently high to accomplish a transfer of glue to the paper web 1. However there should preferably be no deformation of the