Injection Blow Molding

What is the injection blow molding process?

1. Thermoplastic is heated to a molten state.The molten thermoplastic is injection molded into a cavity that encircles the core pin (or blow stem). The resulting injected plastic is called a preform parisonand resembles a test tube with a threaded neck.
2. The injection mold is removed and the preform parison is carried to the next station on the core pin and inserted within the blow mold cavity.
3. Pressurized air is blown through the core pin (usually between 60 to 150 PSI) pressing the plastic preform against the mold cavity similar to the extrusion blow molding process.
   
4. The thermoplastic solidifies to the shape of the mold (with a hollow center).
   
5. The mold opens and the finished product is ejected.