Extrusion Blow Molding Machine: Versatile Solutions for Hollow Plastic Product Manufacturing
What is an Extrusion Blow Molding Machine?
An extrusion blow molding machine is a manufacturing system that produces hollow plastic products by extruding a molten plastic tube (parison) into a mold and inflating it with compressed air. This process is widely used to create bottles, containers, and industrial packaging with uniform wall thickness and complex geometries.
Types of Extrusion Blow Molding Machines
- Continuous Extrusion Blow Molding
- Produces high volumes of small to medium-sized products (e.g., shampoo bottles).
- The parison is continuously extruded while molds rotate to capture and inflate it.
- Intermittent Extrusion Blow Molding
- Ideal for large or heavy-duty items (e.g., drums, automotive fuel tanks).
- The parison is extruded in segments, allowing precise control over material distribution.
- Coextrusion Blow Molding
- Combines multiple polymer layers for enhanced barrier properties (e.g., juice bottles with oxygen barriers).
Key Functions and Advantages
- Design Flexibility: Accommodates complex shapes, handles, and undercuts.
- Cost Efficiency: Low tooling costs compared to injection molding.
- Material Savings: Minimal scrap due to precise parison control.
- Scalability: Suitable for both small batches and mass production.
Applications
- Packaging: Detergent bottles, pharmaceutical containers.
- Automotive: Fluid reservoirs, air ducts.
- Industrial: Chemical storage drums, large-capacity tanks.
Operation Steps
- Material Feeding: Plastic pellets are melted in an extruder.
- Parison Formation: The molten plastic is extruded vertically into a tube.
- Mold Clamping: Two mold halves close around the parison.
- Blowing: Compressed air inflates the parison to conform to the mold.
- Cooling & Ejection: The product solidifies and is removed for trimming.
Innovations
- Servo-Driven Extrusion: Reduces energy consumption by 25%.
- 3D Parison Programming: Adjusts wall thickness dynamically for complex designs.
