A contact interface includes a first contact member including a first contact surface with a first material subsurface and a second material subsurface. The second material subsurface protrudes transversely above the first material subsurface. A second contact member includes a second contact surface to slide in contact with the first contact surface. The first material subsurface comprises a first material. The second material subsurface comprises a second material. The second material has a lower hardness than the first material.

A slitter-winder for winding of pulp webs or corresponding webs with a thickness of at least 0.5 mm, in which the winder is a two-drum winder having two winding drums on support of which at least two pulp web rolls are wound. At least one of the winding drums is a nip acceptance winding drum (NAWD), that is a winding drum with a cover having a hardness of 40-80 Shore A and a thickness of 3-50 mm. The winding drums and a steel core or a shaft of the at least two pulp web rolls have parallel rotation axes and are in a rolling contact where the at least one winding drum is driven.

A winding core with improved beam and hoop strength and diminished friability and method for manufacturing such a core are provided, the method for making the winding core comprising: providing a wood fiber core, applying an adhesive to the wood fiber core, and sliding a tube or sheath onto the wood fiber core.