Method and apparatus for producing hollow articles of thermoplastic material by suction blow moulding

摘要

A process for producing hollow plastic components, comprises feeding a tubular thermoplastic blank (4) into a blow mould (5), and applying suction at the other end. The suction induced air flow can be adjusted, and the suction connection is connected to a side air opening. A process for producing hollow plastic components, comprises feeding a tubular thermoplastic blank (4) into a blow mould (5), and applying suction at the other end. The suction induced air flow can be adjusted, and the suction connection is connected to a side air opening. Before the blank is fed into the mould the suction is raised to a threshold value, and the speed of the suction flow through the mould is altered by changing the outlet cross section on the pressure side of the suction blower. The free cross section of the outlet and the amount of air fed back can be adjusted. The arrangement used to carry out the process includes a blower (7), a servo controlled valve (8) for altering the outlet cross section, and a silencer (11).