Method and apparatus for producing coreless rolls of paper
AssigneePaper Converting Machine Company
InventorMichael E. Techlin
Life of this patent
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Abstract
The mandrel is formed from flexible and elastic material, and after the roll is wound, the mandrel is pulled longitudinally and withdrawn from the roll of paper to form a coreless roll.
Claims45
A roll of wound web material comprising an elongated mandrel and a web convolutely wound around the mandrel, the mandrel being axially elastic and comprised of flexible and elastic material, said flexible and elastic material having a tensile yield strength divided by elastic modulus greater than 2.0%, the mandrel being removable from the wound web.
A roll of wound web material comprising an elongated mandrel and a web convolutely wound around the mandrel, the mandrel including a pair of end portions and an intermediate portion between the end portions, the intermediate portion being axially elastic and comprised of flexible and elastic material, said flexible and elastic material having a tensile yield strength divided by elastic modulus greater than 2.0%, the mandrel being removable from the wound web.
Dependencies are inferred from the claim text.