Extrusion blow molding, also known as blow molding, is a plastics processing method for the production of hollow bodies made of thermoplastics. The melted polymer is pressed through the nozzle via a screw conveyor, resulting in a tubular preform (extrusion). This is transferred to a blow mold and adjusted to the inner contours of the mold using internal pressure (blow moulding). Hollow bodies manufactured in this way are used both as primary packaging such as canisters or barrels and as technical components such as fuel tanks or ventilation ducts.
There are almost no limits to the geometry and contour.