The 1970s, the laser began to be applied to plastic welding. It is the principle of the laser beam (usually present in the infrared region of the electromagnetic spectrum of the cluster of strong radiation waves) through the reflector, lens or fiber optic optical system, focusing on the area to be welded, the formation of the thermal zone, in the thermal zone of the plastic is softened and melted, in the subsequent solidification process, has been melted material to form a joint, to be welded parts that are connected together, usually used for PMMA, PC, ABS, LDPE, HDPE, PVC, PA6, PA66, PS and other light-transmitting materials, add carbon black and other absorbents to enhance the heat-absorbing effect in the heat-activated area. Plastic laser welding has more advantages: welding speed, high precision; automation, precision CNC easy to realize; relatively low cost. Therefore, plastic laser welding technology in the automotive, medical equipment, packaging and other fields have been more widely used. Ultrasonic
In addition to welding between plastic and plastic, due to the automotive industry and other industrial lightweight structure and economic benefits of the needs of some products also need to Plastic and metal mix Connection, plastic hot riveting technology came into being. This hot riveting technology process is simple, easy to realize, safe and reliable, so that the plastic and metal parts in order to best bear the load of the combination of ways, product quality is reduced, the economy improved. In the use of riveting method, can be reserved by a whole molded plastic shaft pin (rivet pile) heated and softened and then by the cold die head stamping deformation of the components will be locked together (the formation of rivet cap, "hot pile"), and therefore more convenient, economical.