INJECTION MOULDING METHOD AND APPARATUS FOR MANUFACTURING A HELMET SHELL

摘要

A method and apparatus for moulding a helmet shell (20) having a return curve or undercut comprises providing a mould cavity between a substantially non-deformable male mould component (22) and a female mould component (24). Mould material is introduced into the cavity and cured therein. After a predetermined time period, the female mould component (24) is released and the shell (20) removed from the male mould component by expanding the shell, preferably by pressuring it internally.