Anvil roll system and method
The disclosure concerns a rotary cutting apparatus including a frame and a die roll defining a first longitudinal axis and comprising a cutting member. The die roll is rotatably connected with the frame and configured to rotate about the first longitudinal axis. The rotary cutting apparatus further includes a bearer ring connected with the die roll and an anvil roll defining a second longitudinal axis and having an outer radial surface. The anvil roll is rotatably connected with the frame and is configured to rotate about the second longitudinal axis. The bearer ring of the die roll is in contact with the outer radial surface. The anvil roll may be supported by at least one cam follower. The anvil roll may be axially removable from the frame via lateral translation along the second longitudinal axis.
1. A method of cutting a web of material, comprising the steps of:
advancing a web of material in a machine direction directly from a first conveyer into a nip between a die roll and an anvil roll, the die roll comprising an outer circumferential portion comprising a cutting member, wherein the outer circumferential portion has a maximum outer diameter, wherein the die roll is rotatably connected with a frame to rotate about a first longitudinal axis, the anvil roll comprising an outer circumferential surface, wherein the anvil roll is rotatably connected with the frame to rotate about a second longitudinal axis, the anvil roll positioned relative to the die roll such that the first longitudinal axis is substantially parallel with the second longitudinal axis, wherein the anvil roll has a maximum outer diameter, where in the maximum outer diameter of the outer circumferential portion is at least twice the maximum diameter of the anvil roll;
supporting the anvil roll with a rotatable cam follower, the rotatable cam follower in frictional contact with the anvil roll;
rotating the die roll about the first longitudinal axis;
rotating the anvil roll about the second longitudinal axis while supporting the anvil roll with the rotatable cam follower;
cutting at least a portion of the web of material with the cutting member; and
advancing the web of material in a machine direction directly from the nip to a second conveyor; and
removing the anvil roll from the frame by laterally translating the anvil roll along the second longitudinal axis and through an opening in the frame while supporting the anvil roll with the rotatable cam follower.
2. The method of cutting a web of material of claim 1 , further comprising the steps of:
rotating an outer surface of the die roll at a first rotational speed about the first longitudinal axis; and
rotating an outer surface of the anvil roll at a second rotational speed about the second longitudinal axis, wherein the second rotational speed is at least twice the first rotational speed.
3. The method of cutting a web of material of claim 1 , wherein the anvil roll has a maximum axial length, wherein the maximum axial length is at least four times the maximum diameter of the anvil roll.
4. The method of cutting a web of material of claim 1 , further comprising the step of: inserting a replacement anvil roll through the opening in the frame by laterally translating the replacement anvil roll along the second longitudinal axis.
5. The method of cutting a web of material of claim 1 , further comprising the step of: adjusting an amount of cutting force by moving the anvil roll toward the die roll.