What is blow molding? What is the principle of blow molding?
Blow molding, also known as hollow blow molding, children's car safety seat is a rapidly developing plastic processing. Blow molding process During World War II, blow molding wheels were initially used to produce low density polyethylene vials. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology has been widely used. The volume of hollow containers can reach thousands of liters, and some production has been controlled by computers. The plastics suitable for blow molding are polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the resulting empty containers are widely used as industrial packaging containers.
According to the manufacturing method of billet, blow molding can be divided into extrusion blow molding and injection blow molding, and the newly developed multi-layer blow molding and tensile blow molding. The tubular plastic billet obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot (or heated to soften), and compressed air is passed into the billet immediately after the mold is closed, so that the plastic billet is blown and close to the inner wall of the mold, and various hollow products are obtained after cooling and demoulding. The manufacturing process of blow molded film is very similar to that of hollow products in principle, but it does not use molds. From the perspective of plastic processing technology classification, the molding process of blow molded film is generally included in extrusion. The blow molding process was initially used to produce low density polyethylene vials during World War II. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology has been widely used. The volume of hollow containers can reach thousands of liters, and some production has been controlled by computers. The plastics suitable for blow molding are polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the resulting empty containers are widely used as industrial packaging containers.
