FIELD: technological processes.
SUBSTANCE: present group of inventions relates to a method for ensuring the dimensional stability of pouring-out openings in or on a plastic container (30) and a plastic container produced in an extrusion blow moulding process, in particular for calibrating said openings. This involves placing into a cavity (4) of a blow mould (1) a portion (20) of a parison extruded with one or more layers through an extrusion die and inflating it as provided by the enclosed cavity by means of a calibrating blow pin (11). All of the pouring-out openings (33, 35) of the plastic container (30) are calibrated at the same time by the double calibrating blow pin inserted axially into the portion (20) of the parison once a head plate (5) of the blow mould (1) has been closed, but before the blow mould (1) has reached its fully closed position. A description is also given of a plastic container with pouring-out openings calibrated by the method according to the invention.
EFFECT: to providing accurate calibration of pouring-out openings in a plastic container, produced in an extrusion blow moulding process.
18 cl, 11 dwg
