Abstract: The foreign historical and latest domestic development as well as some achievements achieved by domestic researchers on basic theory of micro-injection molding machines were reviewed. The existing micro-injection molding techniques were compared systematically. Meanwhile, a newly developed technology of differential injection molding based on the melt pump technology was introduced. Furthermore, a method of effectively manufacturing micro products via regular injection molding machines was proposed.

Key words: micro-injection molding, injection molding machine, differential injection