Absorbent article process and apparatus for intermittently deactivating elastics in elastic laminates
The present disclosure relates to methods and apparatuses for assembling absorbent articles, and more particularly, methods and apparatuses for severing elastic in an advancing elastic laminate. A continuous elastic laminate may be formed by bonding elastic strands between a first continuous substrate layer and a second continuous substrate layer. As discussed in more detail below, the continuous elastic laminate may advance through a cutting apparatus that intermittently deactivates or severs the elastic strands of the elastic laminate along the machine direction.
1. An apparatus for severing elastic strands in an elastic laminate, the apparatus comprising:
an anvil roll including an outer circumferential surface;
a cutting roll adjacent the anvil roll to define a nip between the anvil roll and the cutting roll, the cutting roll adapted to rotate about a first axis of rotation, wherein the outer circumferential surface and first axis of rotation are separated by a minimum distance D 1 ;
a blade connected with the cutting roll, the blade having a distal edge, and wherein the distal edge and the first axis of rotation are separated by a distance D 2 , wherein D 2 is greater than D 1 and defining an interference distance equal to the difference between D 2 and D 1 ; and
wherein the distal edge of the blade is adapted to deflect the interference distance when moving through the nip and wherein the blade bends when the distal edge deflects by the interference distance.
2. The apparatus of claim 1 , wherein the cutting roll comprises an outer circumferential surface; and
wherein the nip is defined by a minimum distance, D, between the outer circumferential surface of the cutting roll and the outer circumferential surface of the anvil roll.
3. The apparatus of claim 2 , wherein the blade extends radially outward from the outer circumferential surface of the cutting roll to define an angle of 90 degrees between the blade and a tangential plane intersecting the proximal end portion on the outer circumferential surface.
4. The apparatus of claim 2 , wherein the blade extends radially outward from the outer circumferential surface of the cutting roll to define an angle of less than 90 degrees between the blade and a tangential plane intersecting the proximal end portion on the outer circumferential surface.
5. The apparatus of claim 2 , wherein the blade comprises a proximal end portion extending axially for a length, L, along the outer circumferential surface of the cutting roll; and wherein the blade defines a distance, H 1 , extending from the proximal end portion to the distal edge.
6. The apparatus of claim 5 , wherein the blade extends radially outward from the outer circumferential surface of the cutting roll to the distal edge by a distance, H, and wherein H 1 is equal to H.
7. The apparatus of claim 6 , wherein H is greater than D.
8. The apparatus of claim 5 , wherein the blade extends radially outward from the outer circumferential surface of the cutting roll to the distal edge by a distance, H, and wherein H 1 is greater than H.
9. The apparatus of claim 8 , wherein H is greater than D.
10. The apparatus of claim 5 , wherein the blade comprises a first surface and an opposing second surface separated by a thickness, t, wherein the thickness is smaller than the distance, H 1 .
11. The apparatus of claim 5 , wherein the distal edge of the blade is curved.
12. The apparatus of claim 11 , wherein the curved distal edge is defined by a radius of about 50 μm to about 4000 μm.
13. The apparatus of claim 5 , wherein the distal edge of the blade is flat.
14. The apparatus of claim 1 , wherein the blade is connected with a support member.
15. The apparatus of claim 14 , wherein the support member is connected with a spring, and the spring is connected with the cutting roll.
16. The apparatus of claim 14 , wherein the support member bends when the distal edge deflects by the interference distance.
17. The apparatus of claim 14 , wherein the spring is compressed radially inward toward the first axis of rotation when the when the distal edge deflects by the interference distance.
18. The apparatus of claim 17 , wherein the spring bends when the when the distal edge deflects by the interference distance.
19. The apparatus of claim 14 , wherein the blade is releasably connected with the support member.
20. The apparatus of claim 1 , wherein the interference distance is at least 5 μm.