18 Blow Molding
Blow molding is a molding process in which heated plastic is blown into a mold cavity to create a hollow object. Blow molding rooted from glass blowing, where melted glass is blown through a tube to inflate the glass. In 1938, Enoch Ferngren and William Kopitke produced the first commercial blow molding machine. In 1939, the first mass production of plastic bottles started in America.
Blow molding involves heating and inflating a plastic tube known as a parison or preform. The parison is placed between two dies that contain the desired shape of the product. Air is then supplied to expand the tube, causing the walls to become thinner and conform to the shape of the mold. Once the blowing process ...
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