Method and apparatus for preparing a liner for a composite pressure container

A method of blow molding a container, the method comprising:

• a) extruding a tube shaped, hollow, elongated parison from an extrusion head, wherein the parison comprises one free end;
• b) closing a molding equipment around the parison,
• wherein the molding equipment comprises a molding cavity and at least one aperture having a pinch surface at an entrance thereof,
• wherein the at least one aperture provides an opening into the molding cavity from outside the closed molding equipment, wherein an excess section of the parison is arranged inside the at least one aperture, and
• wherein the one free end of the parison is kept in place in the molding equipment opposite the at least one aperture;
• c) holding the excess section of the parison in place within the at least one aperture by applying a holding force on an outside of the excess section of the parison;
• d) cutting the parison outside the closed molding equipment, thereby providing the parison with an open end adjacent to the at least one aperture;
• e) arranging a blow pin within the open end of the parison such that the open end of the parison is closed by the blow pin;
• and
• f) blowing pressurized gas from the blow pin into the parison, thereby forming a blow molded container within the molding cavity.