Accumulator Head Blow Molding: Precision Engineering for Large and Thick-Walled Products

What is Accumulator Head Blow Molding?

Accumulator head blow molding is a specialized process where molten plastic is stored in an accumulator before being extruded as a parison. This method is ideal for producing large, heavy-walled products like industrial containers, automotive parts, and playground equipment.

Types of Accumulator Head Machines

1. Single-Layer Accumulators
   • For standard products requiring uniform material distribution (e.g., trash bins).
2. Multi-Layer Accumulators
   • Combine different materials (e.g., HDPE/EVOH) for chemical resistance or insulation.
3. Vertical Accumulators
   • Designed for ultra-large parts like 200L drums or septic tanks.

Key Advantages

• High Material Capacity: Handles large parisons (up to 50 kg) without interruptions.
• Wall Thickness Control: Programmable accumulator pistons ensure consistent material flow.
• Durability: Produces thick-walled products resistant to impact and stress cracking.

Applications

• Industrial Packaging: Chemical drums, IBC totes.
• Automotive: Fuel tanks, battery casings.
• Infrastructure: Stormwater drainage pipes, septic systems.

Operation Workflow

1. Plastic Melting: Resin is melted and fed into the accumulator.
2. Parison Extrusion: The accumulator releases a controlled volume of molten plastic.
3. Mold Inflation: Compressed air shapes the parison into the mold cavity.
4. Cooling & Demolding: Parts cool for 1–5 minutes before ejection.

Technical Innovations

• Hydraulic Proportional Valves: Enable precise parison thickness adjustments.
• Multi-Cavity Molds: Produce multiple parts per cycle for cost efficiency.