Technical Paper
Two Component Room Temperature or Induction Curable Structural Adhesives for Automotive Applications
1995-02-01
950129
Two-component epoxy adhesives that cure at room temperature but are responsive to induction heating offer tremendous processing flexibility in the manufacture of hemmed closure panels. Using a two-component, hemmed closure panels can be induction heated to quickly cure the adhesive. Since two-components are generally very reactive, lower induction temperatures can be used and panel handling strength will still develop within minutes. Also, if panel deformation due to induction heat is a concern, or if spot induction coils are being used, two-component epoxy adhesives build strength with time at ambient temperatures, allowing parts to be handled within 3-4 hours after hemming. Experiments described here will illustrate the differences between single-side coils and L-coil induction heating systems. Other induction experiments will show the sometimes large differential between metal skin temperature and the temperature actually seen by the adhesive in the bondline.