Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. Blow molding process was used to produce low density polyethylene vials during the Second World War.

In the late 1950s, with the birth of high density polyethylene and the development of blow molding machine, blow molding technology was widely used. The volume of the hollow container can reach thousands of liters, and some production has been controlled by computer. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The obtained hollow containers are widely used as industrial packaging containers. According to the manufacturing method of parison, blow molding can be divided into extrusion blow molding and injection blow molding, and the newly developed ones are multilayer blow molding and stretch blow molding.