Extrusion Blow Molding
What is the extrusion blow molding process?
- Thermoplastic is heated to a molten state.The molten thermoplastic is extruded vertically downwards through a die head to form a hollow tube. This hollow, molten plastic tube is called a parison.
- Two halves of a mold closes around the parison sealing off one end while leaving the other open.
- Pressurized air is blown into the parison from the open end. This forces the molten thermoplastic parison against the water-cooled mold.
- The thermoplastic solidifies to the shape of the mold (with a hollow center).
- The mold opens and the finished product is ejected.