Studies on the Process of Ultrasonic Bonding of Nonwovens: Part 1 — Theoretical Analysis

Abstract

A model has been developed to predict the bonding behavior of nonwovens during the ultrasonic bonding process. The model includes the following subprocesses: mechanics and vibrations of the web and horn, viscoelastic behavior of webs and heat generation, and heat transfer. Each subprocess was modeled first and then combined together with the boundary conditions to develop an overall process model. The compressional behavior and thermal conductivity of webs will be discussed and their appropriate equations have been chosen for model. A Finite Element Method (FEM) was used to solve the above coupled model. Subsequently, the heat generation rate and the temperature change during the bonding process were calculated.