988K views · 1.1K reactions | This is how the water tank is made through blow molding process ️ via Yankang Blow Molding Machines | Interesting Engineering | Facebook

Extrusion blow molding is a process for directly manufacturing hollow plastic bottles/containers by using the standard extruder screw and barrel assembly to plasticise the polymer. This molted mass (called parison) is a tube-like piece of plastic with a hole in one end in which compressed air can pass through. After dropping from extruder, this hollow tube is captured by closing it into a water-cooled mold as well as knife cut the parison at the top. When the molds are closed and moved sideways