METHOD AND MACHINE FOR MANUFACTURING PLASTIC CONTAINERS

摘要

A method for manufacturing plastic containers in which, for each container, a plastic preform containing air is supplied; the preform is heated at a preform temperature over the glass temperature of the preform material, the preform is inserted in a mold having a mold cavity; and the preform is expanded to a container having the shape of a mold cavity by a forming liquid. The method also includes, between steps (b) and (d), the injecting of a gaseous product into the preform containing air, wherein the gaseous product is absorbable by the forming liquid. The injection conditions of the gaseous product are selected such that the injected gaseous product expels the air out of the preform.

主权项

1. A method for manufacturing plastic containers, the method comprising, for each container:
(a) a preform supply step in which a plastic preform containing air is supplied; (b) a thermal conditioning step in which the preform is heated at a preform temperature over the glass temperature of the preform material, (c) an inserting step in which the preform is inserted in a mold having a mold cavity; and (d) a forming step in which the preform is expanded to a container having the shape of the mold cavity by means of a forming liquid ; wherein the method comprises a gaseous product injection step (g) between steps (b) and (d), and during said gaseous product injection step, a gaseous product is injected into the preform containing air, said gaseous product being absorbable by said forming liquid, the injection conditions of the gaseous product being determined such that the injected gaseous product expels said air out of the preform.