High-frequency welding of glass-fiber-reinforced polypropylene with a thermoplastic adhesive layer including SiC

In this study, high-frequency (HF) welding of glass-fiber-reinforced polypropylene (GF/PP) was investigated with thermoplastic adhesive layers including SiC, which is able to heat by HF irradiation. The influences of SiC particle size and content on the dielectric properties of an adhesive layer were investigated experimentally. The influence of temperature on the tan δ/ε′ value was also investigated. HF welding process of GF/PP bonded with the thermoplastic adhesive layer, the effects of SiC content and particle size on the welding properties were examined. The GF/PP was completely welded in a short time when SiC with small particle size and high content was included in the adhesive and a good bond strength was also achieved. Thus, short time and high bond strength for the welding were achieved with the method using a thermoplastic adhesive layer with high tan δ/ε′ value.