VOLUME CONTROLLED BLOWING-AIR FEED

摘要

A method for controlling a blow-molding machine for producing a thermoplastic container, wherein a blowing gas for blow-molding the container is introduced into a thermally conditioned preform, while the preform is held in a blow mold of the blow-molding machine. The blowing gas is introduced during a preblowing phase into the preform so that the temperature-conditioned material of the preform approaches the walls of the blow mold. The blowing gas is introduced during a following finish-blowing phase into the preform so that the temperature-conditioned material of the preform is pressed into the contours of the blow mold walls. The volumetric flow rate of the blowing gas is determined at least during the preblowing phase by an adjustable flow-control valve that can be controlled by a control unit that generates a control signal for adjusting the flow-control valve. The flow-control valve is adjusted as a function of the control signal.

主权项

1. A method for controlling a blow-molding machine for producing a container of thermoplastic material, the method comprising the steps of:
introducing a blowing gas for blow-molding the container into a thermally conditioned preform, while the preform is held in a blow mold of the blow-molding machine, including introducing the blowing gas during a preblowing phase into the preform so that the thermally-conditioned material of preform approaches walls of the blow mold; introducing the blowing gas during a following finish-blowing phase into the preform so that the thermally-conditioned material of the preform is pressed into contours of the walls of the blow mold; determining a volumetric flow rate of the blowing gas at least during the preblowing phase by an adjustable flow-control valve controllable by a control unit that generates a control signal for setting the flow-control valve; and adjusting the flow-control valve as a function of the control signal.