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AssigneeTetra Laval Holdings & Finance S.A.
InventorsHans Nantin, Lars Mårtensson, Anders Andersson
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The disclosure relates to a method and an apparatus for producing a sterile packaging container from a thermoplastic blank or preform which, during stepwise displacement between different processing stations (A-H), is subjected to a first heating to a temperature suitable for a subsequent sterilization with the aid of a chemical sterilization agent in gas form. A subsequent, additional heating stage imparts to the blank the desired moulding temperature, whereafter the blank, after displacement to a blow moulding station, is blow moulded to the desired configuration with the aid of mould halves (9) surrounding the blank. Hereafter, the blank is displaced to a filling station (E) in which it is filled with the desired contents in order thereafter finally to be sealed with the aid of a wafer (17) and discharged out of the apparatus according to the present invention.
A method of producing an interiorly sterile packaging container from a blank of thermoplastic material which is heated to moulding temperature and, with the aid of a pressure difference, is urged into abutment against an adjacent moulding surface, characterized in that the blank (1) is first heated to a temperature above the dew point of a gaseous sterilization agent which is thereafter brought into contact with the interior of the blank for a certain period of time;
An apparatus for producing an interiorly sterile packaging container from a blank (1) of thermoplastic material, said apparatus comprising a number of sequentially arranged processing stations (A-H), characterized in that it includes at least two stations (B, D) for heating the blank (1), and also an interjacent station (C) for sterilizing treatment of the blank.
Dependencies are inferred from the claim text.