Apparatus for perforating a nonlinear line of weakness
A perforating apparatus has a base having at least one counter component. The counter component has a length, L CC , and a nonlinear shape having a shape width, W. A support is operatively engaged with the base. A blade having a length, L B , is disposed on the support so as to cooperate in interacting relationship with the counter component. The blade has a plurality of teeth. A web material is perforated as it passes between the base and the support and the blade cooperates with the counter component. A driving means is associated with one of the support and the base to reciprocally shift the one of the support or the base for a distance, D, in a shifting direction. The distance, D, is at least the translational distance that one tooth travels to cover the shape width, W.
1. An apparatus for providing a nonlinear line of weakness on a web material, the apparatus comprising:
a base comprising at least one counter component having a length, L cc , wherein the counter component comprises a nonlinear shape that is periodic, has a wavelength and a shape width, W, equivalent to the wavelength;
a support operatively engaged with the base;
a blade having a length, LB, and being disposed on the support so as to cooperate in interacting relationship with the counter component, wherein the blade has a plurality of teeth, wherein a web is perforated as the web passes between the base and the support and the blade cooperates with the counter component; and
a driving means associated with one of the support and the base to reciprocally shift the one of the support or the base for a distance, D, in an axial shifting direction, wherein the distance one of the plurality of teeth shifts is equivalent to the shape width, W.
2. The apparatus of claim 1 , wherein the base comprises a cylindrical base having a base longitudinal axis, wherein the base rotates about the base longitudinal axis.
3. The apparatus of claim 1 , wherein the support is moveable with respect to the base.
4. The apparatus of claim 1 , wherein the base is moveable with respect to the support.
5. The apparatus of claim 1 , wherein the driving means is associated with the support.
6. The apparatus of claim 1 , wherein the counter component comprises an anvil.
7. The apparatus of claim 1 , wherein the driving means comprises a linear actuator.
8. The apparatus of claim 1 ,
wherein the counter component is helically mounted on the cylindrical base at an angle of from 2 degrees to 20 degrees with respect to a base longitudinal axis.
9. The apparatus of claim 8 , wherein the base comprises a cylindrical base having a base longitudinal axis, wherein the base rotates about the base longitudinal axis.
10. The apparatus of claim 8 , wherein the support is moveable with respect to the base.
11. The apparatus of claim 8 , wherein the base is moveable with respect to the support.
12. The apparatus of claim 8 , wherein the driving means is associated with the support.
13. The apparatus of claim 8 , wherein the counter component comprises an anvil.
14. The apparatus of claim 8 , wherein the driving means comprises a linear actuator.
15. The apparatus of claim 1 ,
wherein the counter component is helically mounted on the cylindrical base at an angle of from 4 degrees to 8 degrees with respect to a base longitudinal axis.
16. The apparatus of claim 15 , wherein the support comprises a cylindrical support having a support longitudinal axis, wherein the support rotates about the support longitudinal axis.
17. The apparatus of claim 15 , wherein the driving means is associated with the support.
18. The apparatus of claim 15 , wherein the driving means is associated with the base.
19. The apparatus of claim 15 , wherein the counter component comprises an anvil.
20. The apparatus of claim 15 , wherein the driving means comprises a linear actuator.