METHOD AND APPARATUS FOR CLOSED LOOP BLOW MOLDING

摘要

A method and apparatus for blow molding containers is disclosed, the method including the steps of; a) heating a preform to a desired temperature in an oven having a plurality of heating units in a stack; b) blow molding a container from the heated preform; c) measuring a wall thickness at a desired location along a longitudinal axis of the container; d) generating a signal representing the wall thickness; e) comparing the signal representing the wall thickness to a standard range of wall thickness measurements; and f) adjusting the energy output of the plurality of heating units of the oven to affect the production of subsequent containers if the signal is not within the standard range, wherein the energy output of at least one heating unit is increased and the energy output of at least another heating unit is decreased by an amount equal to the increase.