![]() Blow molding is a fairly straightforward process that includes melting, homogenizing, extruding, molding (blowing), cooling, and ejection. This chapter discusses the general blow molding process. By the 1950s, the commercialization of blow molding was completed, and the industry grew exponentially. LDPE is more suitable for blow molding which then paved the way for further process development. Come 1939, low-density polyethylene (LDPE) was introduced by Imperial Chemical Industries from England. The process uses cellulose acetate as the raw material. The next major advancement came around the 1930s with the development of the first blow molding machine by Plax Corporation. The process was patented by Samuel Armstrong in the 1850s. The first blow molding material used other than glass was natural rubber. Glass mold-blowing was later developed as an alternative process that came about around the 1st century AD. The first injection molding process for glass, known as free-blowing, was created around the 1st century BC. Both glass and plastic in their molten state can be formed easily by introducing small amounts of air inside the molten material. Plastic blow molding originated from the ancient process of glass blowing. Typical raw materials used are polyethylene (PE), polyethylene terephthalate (PET), and polypropylene (PP). The global market share of blow molding was estimated at around $78 billion in 2019 and is expected to grow annually by 2.8% from 2020 to 2027. This is followed by building and construction, consumer products, and transportation industries. Once the blowing process is complete, the product is then cooled, ejected, trimmed, and prepared for the secondary processes.īottling and packaging are the main applications of blow molding which comprise about 49% of the global blow molding market share. Air is then supplied to expand the tube causing the walls to become thinner and conform to the shape of the mold. The parison is placed between two dies that contain the desired shape of the product. ![]() The process involves heating and inflating a plastic tube known as a parison or preform. Blow molding is a type of plastic forming process for creating hollow plastic products made from thermoplastic materials.
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