Patent ID: 7877242

Claim:
A method of simulation, comprising: creating a computer based model of a portion of a continuous web of diaper materials, wherein the portion of the continuous web of diaper materials includes: a sheet-like series of partially formed, connected diapers, wherein each of the diapers includes a chassis and an absorbent core; and a leading edge with a rigid middle portion, a rigid trailing edge, and a flexible middle portion held in tension between the leading edge and the rigid trailing edge; creating a computer based model of at least a portion of a diaper converting machine, wherein the diaper converting machine is configured to convert a continuous web of diaper materials into individual diapers, and wherein the portion of the diaper converting machine is configured to physically interact with the portion of the continuous web of diaper materials; creating a computer based model of air, including: a first volume of air completely surrounding the portion of the continuous web of diaper materials and at least part of the portion of the diaper converting machine, wherein the first volume of air is configured to allow pressure variations and to allow air exchanges with a second volume; and the second volume of air substantially surrounding the first volume of air, wherein the second volume of air is configured at a particular constant pressure that is about equal to an atmospheric pressure; and simulating a physical behavior of the model of the portion of the continuous web of diaper materials interacting with the model of the portion of the diaper converting machine and moving through the model of the air, during a particular period of time.