Method for producing coreless rolls of paper
A method of forming a roll of convolutely wound web material. The method includes applying adhesive to an elongated mandrel, winding web material around the mandrel to form a roll of convolutely wound web material, rotating the mandrel relative to the roll to smear the adhesive, and removing the mandrel from the roll. The smearing can be in a circumferential direction. The adhesive can be applied longitudinally along the mandrel. The adhesive preferably has a viscosity within the range of 3000 to 18,000 cps. Preferably, the method includes pulling the mandrel longitudinally before the step of removing the mandrel from the roll. The pulling can reduce the mandrel diameter and/or can increase its length. The rotating can be conducted before the pulling, during the pulling or during the winding. The rotating can be conducted before or during the removing. The web material can be bathroom tissue or kitchen towel.
1. A method of forming a roll of convolutely wound web material comprising the steps of:
a) applying an adhesive to an elongated mandrel;
b) winding a web material around said mandrel to form a roll of convolutely wound web material,
c) rotating the mandrel relative to the roll to smear the adhesive; and
d) removing the mandrel from the roll.
2. The method of claim 1 including the step of pulling the mandrel longitudinally before the step of removing the mandrel from the roll.
3. The method of claim 2 in which the step of rotating the mandrel relative to the roll is performed before the step of pulling the mandrel longitudinally.
4. The method of claim 2 in which the step of rotating the mandrel relative to the roll is performed during the step of pulling the mandrel longitudinally.
5. The method of claim 2 in which the step of rotating the mandrel relative to the roll is performed during the step of winding the web around the mandrel.
6. The method of claim 2 in which the step of pulling the mandrel longitudinally reduces the diameter of the mandrel.
7. The method of claim 2 in which the step of pulling the mandrel longitudinally increases the length of the mandrel.
8. The method of claim 1 in which the step of rotating the mandrel relative to the roll is performed before the step of removing the mandrel from the roll.
9. The method of claim 1 in which the step of rotating the mandrel relative to the roll is performed during the step of removing the mandrel from the roll.
10. The method of claim 1 in which the step of rotating the mandrel relative to the roll is performed during the step of winding the web around the mandrel.
11. The method of claim 1 in which the step of rotating the mandrel relative to the roll smears the adhesive in a circumferential direction around the mandrel.
12. The method of claim 1 in which the adhesive is applied longitudinally along the mandrel.
13. The method of claim 1 in which the adhesive has a viscosity within the range of 3000 to 18,000 cps.
14. The method of claim 1 in which the web is bathroom tissue.
15. The method of claim 1 in which the web is kitchen towel.
16. The method of claim 1 in which the mandrel is comprised of material having tensile yield strength divided by elastic modulus greater than 2.0%.
17. The method of claim 1 including the step of recirculating the mandrel after the mandrel is removed from the roll and using the mandrel to repeat steps a), b), c), and d).
18. The method of claim 1 in which the mandrel is comprised of flexible and elastic material.
19. The method of claim 1 in which the mandrel is comprised of axially elastic material.
20. The method of claim 1 in which the mandrel is comprised of radially elastic material.
21. The method of claim 1 in which the mandrel is comprised of thermoplastic.
22. The method of claim 1 in which the mandrel is comprised of HDPE.
23. The method of claim 1 in which the material of the mandrel has a Poisson's ratio of greater than 0.35.
24. The method of claim 1 in which the material of the mandrel has a Poisson's ratio of greater than 0.40.
25. The method of claim 1 further comprising initiating winding of the web material around the elongated mandrel with the adhesive applied to the mandrel.