Method for converting a blow molding machine and blow molding machine
AssigneeKrones AG
InventorJochen Hirdina
Life of this patent
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Abstract
A method for converting a blow molding machine with a plurality of rotatingly movable molds heated to a heat-set operating temperature, due to mold change, having at least one simulated work cycle carried out in the blow molding machine with molds left empty, and a cooling medium then simultaneously supplied to all mold cavities from the outside so as to cool the molds in comparison with the heat-set operating temperature. In a machine control the blow molding machine has a program routine for performing at least one simulated work cycle with empty molds and at a reduced rotational speed of the molds with external supply of a cooling medium into the molds.
Claims19
A method for converting a blow molding machine (B) for plastic containers (F) of preforms (P), particularly PET bottles (F), due to a mold change, the blow molding machine (B) having a plurality of molds which are rotatingly movable during a work cycle and heated to a heat-set operating temperature, comprising carrying out at least one simulated work cycle with empty molds for preparing the mold change in the blow molding machine (B), during the at least one simulated work cycle conveying a cooling medium (L, M) at least substantially at the same time through all of the mold cavities of the molds and cooling the molds by the externally supplied cooling medium (L, M) with respect to the heat-set operating temperature by heat discharge from the mold cavity surfaces.
A blow-molding machine (B), particularly stretch blow-molding machine, for blow molding plastic containers from preforms (P), particularly PET bottles (F) for hot filling, comprising heat-set molds that are rotatingly moved during a normal work cycle and exchangeably held, a programmable machine control (C), a conveying device for conveying a medium (M, L) in each mold, and the machine control (C) has a program section (D) with a program routine (R) for carrying out at least one simulated work cycle with empty molds and at a reduced rotational speed for the forced cooling of the mold cavity surfaces with external supply of a cooling medium (M, L) into the molds.
The blow-molding machine according to claim, and at least one additional conveying device which is connectable to the molds and the stretching rods, respectively, at least during the simulated work cycle for conveying a gaseous or liquid cooling medium (M, L), or separate supply paths are only provided for the forced cooling, or a combination thereof.
Dependencies are inferred from the claim text.