Bonding technologies for plastics and metals

Multimaterials having properties of both plastics and metals accelerate lightweighting



Examples of bonded plastics and metal (Taisei Plas)

As electrification and autonomous driving advances in automobiles, the need to equip a vehicle with new components grows, driving further increases in vehicle weight, which requires lightweighting of vehicles now more than ever. One solution for lightweighting, is the increased use of plastics with low specific weight and light metals. That said, to ensure structural rigidity, the adoption of ultra-high-strength steel is also being aggressively pursued. In light of these trends, lightweighting by the multimaterialization of bonded plastics and metals has been receiving increased attention recently.

One feature of bonding plastics and metals, involves using the required properties of plastics (such as lightweight, insulation, shaping flexibility, and productivity) and properties of metals (such as strength, electrical conductivity, and thermal conductivity), making it possible to manufacture parts possessing the combined properties of both materials.


This report presents some of the recent trends in the automotive field focusing on the bonding technologies of metals and plastics, in cooperation with Mr. Takeo Yasuda, director of Yasuda Polymer Research Institute. Various bonding methods for plastics exist such as welding (supersonic welding, vibration welding, hot plate welding, high frequency welding, hot gas welding, laser welding, contact welding, friction welding, multicolor molding), adhesion (adhesive glue, hot melt, solvent, adhesive tape), and mechanical fastening (tapping screw, nuts and bolts, rivet, insert, snap fit).

In the previous report on plastics for automotive applications, the general trends in technology and materials development were introduced, as well as examples of the adoption of plastic materials and components for powertrain and interiors that included photo images.


Related reports:
Plastic components and materials accelerating lightweighting in automobiles (Nov. 2018)