Process: An extruded tube is pinched at one end and expanded with hot air to fill the cavity of a two part metal mould. Once cooled the piece is removed from the mould and the pinch point is trimmed.
Introduced: 1881 for use with cellulose nitrate.
Plastics: Commonly high density polyethylene and polyethylene terephthalate.
Marks: A pinch line.
Tooling cost: Relatively high.
Production volume: High.
Uses: Hollow articles, usually with openings of smaller diameter than the body, such as bottles or containers.
