| 摘要 |
<p>The Specification describes a process for the production of hollow moulded articles from thermoplastic synthetic resin which comprises introducing molten thermoplastic synthetic resin into a mould, introducing an inert gas into the mould in a manner and under a pressure serving to mould the molten synthetic resin according to the internal shape or configuration of the mould whereby a hollow moulded article is formed, hermetically sealing the hollow moulded article, cooling the sealed article to a temperature below the softening point of the resin and piercing the wall of the sealed article to equalise the pressure of the gas in the sealed article and that of the ambient atmosphere. The inert gas and the molten thermoplastic synthetic resin are preferably introduced into the mould through the same inlet. The hermetic sealing of the mould is advantageously effected by the introduction of a further amount of molten thermoplastic resin into the mould, e.g. by the inlet through which the gas and first mentioned molten synthetic resin are introduced into the mould.</p> |
