Roll product comprising a core, and a method and an apparatus for its manufacture
OwnerPeter Von Paleskeinventor
Life of this patent
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Abstract
A roll product consists of a band-shaped web of material having a first end, a second end and a hollow cylindrical core onto which the band-shaped web of material is wound. The hollow cylindrical core has a longitudinal direction and a radial direction. The hollow cylindrical core comprises an inner surface, an outer surface, and at least one protuberance protruding outwardly from the outer surface, principally in the radial direction of the hollow cylindrical core, for mechanically and releasably engaging and holding the first end of the band-shaped web of material. The protuberance is an integral part of the hollow cylindrical core and comprises the inner surface and the outer surface of the hollow cylindrical core.
Claims22
A roll product comprising a band-shaped web of material having a first end and a second end and a hollow cylindrical core onto which the band-shaped web of material is wound, the hollow cylindrical core having a longitudinal direction and a radial direction, the hollow cylindrical core comprising an inner surface, an outer surface, and at least one protuberance protruding outwardly from the outer surface of the hollow cylindrical core, principally in the radial direction of the hollow cylindrical core, for mechanically and releasably engaging and holding the first end of the band-shaped web of material, the protuberance being an integral part of the hollow cylindrical core and comprising the inner surface and the outer surface of the hollow cylindrical core.
A method for the manufacture of a roll product which comprises:
- sliding a hollow cylindrical core onto a perforated mandrel penetrating means for penetrating the hollow cylindrical core in a direction from the inner surface of the hollow cylindrical core;
- the mandrel further comprising an inner expanding core which is made to expand and at which the penetrating means are pressed against the inner surface of the hollow cylindrical core;
- whereby protuberances are formed protruding outwardly from the outer surface of the hollow cylindrical core, principally in the radial direction of the hollow cylindrical core;
- advancing a band-shaped web of material having a first end and a second end into contact with the hollow cylindrical core;
- bringing the first end into mechanical and releasable engagement with protuberances protruding outwardly from an outer surface of the hollow cylindrical core,
- winding the band-shaped web of material onto the hollow cylindrical core.
An apparatus for the manufacture of a hollow cylindrical core for mechanically and releasably engaging and holding a first end of a band-shaped web of material in an initial winding of the band-shaped web of material, the apparatus comprising a mandrel having an outer perforated cylinder, an inner hollow cylinder with penetrating means arranged on the outer surface of the inner hollow cylinder and an expanding core having a first non-expanded state and a second expanded state, said penetrating means protruding out through the perforations in the outer perforated cylinder when the expanding core is in the expanded state.
Dependencies are inferred from the claim text.