Extrusion Blow Moulding (EBM) is a converting technique for the mass production of hollow products like bottles, jerrycans, watering cans, and intermediate bulk containers (IBC) among others. Sizes can range from only 30 ml up to 1000 liter and in exceptional cases even 10,000 liters.
Polymer is extruded downwards in a tube (called a parison) of molten polymer which is being inflated in a cooled mold. Depending on the size of the article different grades are being used. the bigger the blow-molded article, the lower the Melt Flow Rate (MFR) needed, which is a measure of the viscosity of the molten polymer.
High-Density Polyethylene (HDPE) is the most widely used resin for Extrusion Blow Moulding but also Low-Density Polyethylene (LDPE) and Polypropylene (PP) are being used for specific products if more flexibility or transparency is required.