How the Extrusion Blow Molding Process Works

Extrusion blow molding is used to make hollow plastic products by inflating a heated plastic parison inside a mold. It is widely used for bottles, jerrycans, containers, automotive ducts, toys, medical containers, and industrial hollow parts.

The common processes are extrusion blow molding, injection blow molding, and stretch blow molding. Extrusion blow molding extrudes a molten tube into an open mold. Injection blow molding uses an injection molded preform. Stretch blow molding reheats and stretches a preform, usually for PET bottles.

Extrusion blow molding is practical for many hollow products because tooling is usually simpler than injection-based methods, material choices are broad, and the process can handle handles, ducts, large containers, and irregular shapes. It also supports multi-layer structures and downstream automation.

The process includes 1. Extruding the parison, 2. Closing the mold around the parison, 3. Blowing compressed air to form the product, and 4. Cooling, opening the mold, and removing or trimming the product. Machine setup, mold cooling, parison control, and material behavior all affect the result.

Common products include milk and juice bottles, detergent containers, lubricant bottles, 20L jerrycans, chemical containers, automotive ducts, fuel tanks, toys, kayaks, medical containers, and industrial parts. The final setup depends on material, size, wall thickness, output target, and automation needs.

Jonh Huah matches the machine type, clamping structure, die head, parison control, mold, leak testing, trimming, recycling, and automation to the target product. The correct setup depends on product size, resin, output target, wall thickness tolerance, and available labor.

Jonh Huah supports extrusion blow molding projects by matching the machine type, clamping structure, die head, parison control, automation, and downstream equipment to the target product. Typical applications include small bottles, food and beverage containers, 20L jerrycans, automotive ducts, and industrial parts. The correct setup depends on product size, resin, output target, wall thickness tolerance, and available labor.