A method for crimping a continuous web of paper comprising the step of feeding a continuous web of paper through a gap defined between a first and a second roller (2a, 2b), each of which is provided with a succession of circumferential protrusions and recesses alternated with each other along the axis of rotation (X, Y) of the roller (2a, 2b), where the rollers (2a, 2b) are coupled to each other so that the protrusions of one roller (2a) are at least partly inserted into the recesses of the other roller (2b) and vice versa, and the step of folding the continuous web of paper along parallel longitudinal lines during a rotation of the rollers (2a, 2b), characterized in that it further comprises a step of cleaning the rollers (2a, 2b) by removing particles of material released in the recesses by the web while it is being folded.
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