The production of the closure parts (doors, engine hood, trunk, fenders) is a separate process step within the body in white production line. One of the most demanding joining process in body in white manufacturing is the hem flange process.
A standard bead is a preferred solution to gain outstanding strength and stiffness with epoxy-based adhesives.
Adhesive between inner and outer sheet not only fulfills a structural function, it also prevents corrosion, which is especially important in the production of all closure parts.
In hem flange bonding In body in white the swirl technology gets more and more attention, due to its ability to offer an excellence material distribution and a more reliable process window.
Especially in closures the handeling of a bead application can become quite difficult when it comes to a complex part geometry. Thats why the swirl technology and its flexibility is becoming more and more popular within the automotive industry.
A regular bead application is still the most established application type in hem flange bonding.