Patents Assigned to Ahlstrom Cores Oy
  • Paperboard core with an improved chuck strength, for the paper industry, and a method of fabricating such
    Patent number: 6540174
    Abstract: A method of fabricating paperboard cores, and the paperboard cores so fabricated, have improved chuck strength and can be used with chucks rotating at a speed of at least 200 mm/min., even with paper rolls having a weight of over 8.5 tons. A plurality of paperboard plies (e.g. made by press drying) are wound spirally around a mandrel into a tube to produce a paperboard core having a cylindrical surface and inside diameter and a wall thickness of 10 mm or more.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: April 1, 2003
    Assignee: Ahlstrom Cores Oy
    Inventor: Markku Jarvinen