Gas injection molding is a technology that injects high-pressure inert gas (usually nitrogen) into molten resin during the injection molding process to form hollow sections within the product. This effectively prevents sink marks and warpage in thick-walled parts, leading to lighter products, shorter molding cycles, and reduced material costs. Furthermore, the hollow structure maintains product rigidity while improving the moldability of complex shapes and parts with significant wall thickness variations. Its main applications are widespread in parts requiring high design quality and functionality, such as automotive components (door handles, instrument panels), home appliances, and casings for office automation equipment. Typical processing methods include the short shot method and the full shot method.