Injection Blow Molding
What is the injection blow molding process?
- 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.
- 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.
- 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.
- The thermoplastic solidifies to the shape of the mold (with a hollow center).
- The mold opens and the finished product is ejected.