Method for calibration of a pour opening of a plastic container produced in an extrusion-blow-molding method

Method for providing dimensional accuracy of a pour opening in or on a plastic container produced by extrusion-blow-molding, comprising:

• inserting a section of a plastic hose, extruded in one or more layers through an extrusion nozzle, into a mold cavity of a blow mold tool;
• and
• inflating the plastic hose by a calibrating blow pin according to a shape of the mold cavity, whereby at least one pour opening of the plastic container is determined with respect to its inside diameter and its inside contour to form a completed inflated plastic container, and wherein the calibrating blow pin is axially inserted into the plastic hose section after a head plate of the blow mold tool has been closed, and before the blow mold tool has reached its completely closed position, an axial displacement of the plastic hose being avoided when the calibrating blow pin is axially inserted, and wherein when the blow mold tool is completely closed, the plastic hose is radially squeezed in an area of calibrating surfaces of the calibrating blow pin.