Method for producing coreless rolls of paper
AssigneePaper Converting Machine Company
InventorMichael E. Techlin
Life of this patent
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Abstract
A method of forming a roll of convolutely wound web material. The method includes winding web material around an elongated mandrel to form a roll of convolutely wound web material. The mandrel is substantially axially elastic and formed of material having a tensile yield strength divided by elastic modulus greater than 2.0%, and more preferably 2.5%. The mandrel is preferably radially complaint. The method further includes removing the mandrel from the roll. A further method includes winding web material around an elongated mandrel to form a roll of convolutely wound web material, the mandrel being comprised of material having a tensile yield strength divided by elastic modulus greater than 2.0%, and then longitudinally elongating the mandrel.
Claims48
A method of forming a roll of convolutely wound web material comprising the steps of:
- a) winding a web material around an elongated mandrel to form a roll of convolutely wound web material, the mandrel being substantially axially elastic and comprised of material having a tensile yield strength divided by elastic modulus greater than 2.0%;
- and
- b) removing the mandrel from the roll.
A method of forming a roll of convolutely wound web material comprising the steps of:
- a) winding a web material around an elongated mandrel to form a roll of convolutely wound web material, the mandrel being comprised of material having a tensile yield strength divided by elastic modulus greater than 2.0%;
- b) longitudinally elongating the mandrel;
- and
- c) removing the mandrel from the roll.
Dependencies are inferred from the claim text.