초록 ▼

This relates to a heating system and process for reheating preforms prior to delivering the preforms to a blow molder. The heating system utilizes different types of heating units, one of which will heat the preform wall more highly at the interior surface and the other of which will heat the prefor

This relates to a heating system and process for reheating preforms prior to delivering the preforms to a blow molder. The heating system utilizes different types of heating units, one of which will heat the preform wall more highly at the interior surface and the other of which will heat the preform wall at the exterior surface. By effectively controlling the heat input to a preform from each heating unit and by controlling the outputs of the different heating units in combination, the desired temperature profile through the preform wall may be obtained substantially without any time in the oven being provided for heat equilibration and at the same time a maximum heating effort may be effected to produce the necessary heating of a preform within a minimal time and more uniformly than heretofore possible.

대표청구항 ▼

A hybrid heating system for reheating polymer tubular preforms, said heating system comprising at least one first type heating means for heating preforms in a manner wherein an interior surface of a wall of each preform is heated to a higher temperature than an exterior surface of that wall, and at

A hybrid heating system for reheating polymer tubular preforms, said heating system comprising at least one first type heating means for heating preforms in a manner wherein an interior surface of a wall of each preform is heated to a higher temperature than an exterior surface of that wall, and at least one second type of heating means for heating preforms in a manner wherein an exterior surface of a wall of each preform is heated to a higher temperature than an interior surface of that wall, whereby a desired temperature profile through a preform may be obtained, all of said heating means being disposed completely externally of a preform to be heated.