Extrusion blow molding (EBM) is used to produce hollow containers, articles, and component parts. Typically, the resins are thermoplastic resins such as copolyester, polyethylene, polyvinyl chloride, polycarbonate, and so forth. The molding process consists of melting the resin in the extruder, forming the parison through a head and die assembly, then blowing the hollow parison, and quenching the sidewalls inside a mold to the desired shape.

Typical Medical Applications: Medical and Pharmaceutical Packaging, Medical Tubing, Labware, IV Solution Bottles

Extrusion blow molding should be used when the contents of the molded containers are packaged at ambient or very low pressure. Because of low capital investment for new molds, extrusion blow molding lends itself to low and medium volume production runs. EBM products can have complex shapes and a wide range of sizes. Wall thickness is easily varied, even in the individual articles.

Typical Processing Conditions for Extrusion Blow Molding
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Polymers Mold Size Die Type (designed for PVC) Bushing ID, mm(in) Mandrel OD, mm(in) Thread Finish, mm Drying Target Pellet Moisture Eastar™ MN210 10 oz. RVP 17.8 14.2 24 160° for 6 hours less than 0.02 Eastar™ 6763 38 oz. dual BKD 51/140 23.1 (0.91) 18.2 (0.72) 28 160° for 6 hours less than 0.02 Eastar™ MB002 64 oz. S1-110 70 (2.76) 68 (2.68) 68 (2.68) 160° for 6 hours less than 0.02 Eastar™ MB002 4 liter S1-110 70 (2.76) 38 38 160° for 6 hours less than 0.02 Extrusion Set Temperatures, °C (°F) Polymers Mold Size Barrel Zones Adapter Head Die Bushing Zone 1 Zone 2 Zone 3 Zone 4 Eastar™ MN210 10 oz. 195 (385) 210 (410) 195 (385) 195 (385) 195 (385) 195 (385) 205 (400) Eastar™ 6763 38 oz. 205 (400) 230 (450) 170 (340) 165 (325) 170 (340) 175 (350) 210 (410) Eastar™ MB002 64 oz. 196 (385) 210 (410) 193 (380) 193 (380) 193 (380) 193 (380) 193 (380) Eastar™ MB002 4 liter 200 (392) 210 (410) 210 (410) 210 (410) 210 (410) 210 (410) 210 (410)   Polymers Mold Size Melt Temperature (probe) Screw Speed, rpm Bottle weight, g Mold Coolant Temp., °C (°F) Overall Cycle, s Data Sheet MSDS Eastar™ MN210 10 oz. 205 (400) 6 25 10 (50) 8.3 Eastar™ 6763 38 oz. 220 (420) 25 65 10 (50) 7.25 Eastar™ MB002 64 oz. 235 (455) 28 75 24 (75) 15 Eastar™ MB002 4 liter 241 (455) 28 150 24 (75) 16