How to Manufacture 5 Gallon PC Barrel

2025-11-22

What is PC Barrel?

PC barrels are made of polycarbonate plastic, a material known for its high strength, good transparency, high temperature resistance (capable of withstanding temperatures exceeding 100°C), and durability.

How to Manufacture 5 Gallon PC Barrel-Kingplas Machinery Co., Ltd

The most common and efficient method for producing hollow, transparent containers like PC barrels is Extrusion Blow Molding Machine (EBM). This process involves extruding a molten tube of plastic (called a “parison”) and then inflating it inside a mold.

Blow Molding Process for 5 Gallon PC Barrel:

1. Drying: PC pellets are loaded into the desiccant dryer and dried according to strict parameters.

2. Plasticizing: Dried pellets are fed into the extruder, where they are melted, mixed, and de-gassed (if a vented extruder is used).

How to Manufacture 5 Gallon PC Barrel-Kingplas Machinery Co., Ltd

3. Accumulation: The melt is collected in the accumulator head.

4. Parison Dropping: The accumulator ram pushes the melt out through the die, forming a parison. A parison programmer controls the wall thickness.

5. Mold Closing: The mold closes around the parison, pinching it at the top and bottom.

6. Blowing: The blow pin enters the neck and injects high-pressure air, inflating the parison to the shape of the mold.

7. Cooling: The part is held in the cooled mold until it solidifies. Internal air can be exhausted and re-pressurized for better cooling.

How to Manufacture 5 Gallon PC Barrel-Kingplas Machinery Co., Ltd

8. Mold Opening & Ejection: The mold opens, and the finished barrel is ejected.

9. Finishing: The flash (excess material at the pinch-offs) is trimmed, often in a secondary operation.

Advantages of Using Extrusion Blow Molding for PC Barrels:

1. Seamless & Strong: Produces a one-piece, seamless container with excellent hoop strength.

2. Handle Integration: The mold can be designed to include an integral handle, a critical feature for water barrels.

3. Material Efficiency: Parison programming minimizes material usage while optimizing strength.

4. High Production Rates: Extrusion blow molding machine is suitable for mass production.

Why Choose Kingplas Machinery?

Has 30 years blow molding experience. Our blow molding machine portfolio is designed to handle a wide range of thermoplastic materials, including HDPE, PP, PE, PVC, PC, and PETG, for containers ranging from 10ml to 1250L.

Automatic Extrusion Blow Molding Machines: High-speed continuous extrusion systems (Single/Double Station) for cosmetics, lubricants, and household chemicals.
Accumulator Head Blow Molding Machine: Robust solutions for large-scale industrial parts, such as 200L drums, IBC tanks, and automotive components.
Multi-Layer Co-Extrusion Technology: Advanced 2-to-6 layer systems that provide superior barrier properties for agrochemical and fuel tank applications.
Turnkey Solutions: Integrated production lines including precision mold design and auxiliary equipment.