1. Mahjong usually consists of the card body (including the card face and card back), magnetic accessories (some mahjong have them, which are used for identification and adsorption by the mahjong machine), etc. Common materials include plastics (such as ABS, melamine, etc.), and the characteristics of different materials affect the selection of molding and assembly processes.

2. In the production of mahjong, the ultrasonic welding process, with its advantages of high quality, high efficiency, and environmental friendliness, has become a key technology to promote the modernization of mahjong production. In the future, with the development of material technology and the intelligence of ultrasonic equipment, it is expected to further optimize the welding effect, adapt to more new mahjong materials and complex structural designs. At the same time, combined with the industrial Internet, it can achieve digital control of the entire welding process, helping the mahjong industry to move forward in a more efficient, higher - quality, and more intelligent direction. With the support of modern production processes, this traditional chess and card tool will continue to glow with vitality.