Fully Automatic 3-Layer Co-extrusion Blow Moulding Machine for 4000L HDPE Water Storage Tanks

Huayu 4000L 3-Layer Co-extrusion Blow Moulding Machine is a heavy-duty large hollow blow moulding equipment independently developed and manufactured for producing high-capacity plastic storage tanks. This machine is engineered to fabricate 4000-liter multi-layer hollow containers with outstanding barrier performance, widely applied in chemical liquid storage, water conservation, environmental protection, aquaculture and industrial fluid transportation sectors.

The 3-layer co-extrusion structure is the core highlight of this model. Three groups of extrusion systems work synchronously to melt and convey different plastic raw materials respectively. Different functional materials can be matched for inner, middle and outer layers according to customer requirements. The outer layer adopts high-rigidity HDPE material to guarantee excellent weather resistance, scratch resistance and anti-ageing performance, which enables finished tanks to withstand long-term outdoor exposure under ultraviolet radiation and temperature fluctuations. The middle layer can be equipped with barrier resin to greatly reduce the penetration of chemical solvents, volatile gas and moisture, effectively improving the storage safety of corrosive chemicals. The inner layer uses food-grade or anti-corrosion raw materials optionally, catering to the demands of drinking water storage and chemical medium holding. Compared with single-layer containers, three-layer products achieve better comprehensive performance without excessive increase of material cost, bringing higher economic benefits for end users.

This blow moulding machine adopts fully automatic operation logic covering raw material feeding, plasticizing, parison extrusion, wall thickness control, mould clamping, blow forming, cooling, mould opening and product ejection. The whole production cycle runs continuously with minimal manual intervention. It is equipped with an advanced parison wall thickness control system. Multiple axial and radial measuring points dynamically adjust the die gap in real time during parison extrusion, so that the wall thickness of the whole tank maintains uniform distribution. It avoids local thin spots or material waste, stabilizes product quality and lowers raw material consumption. The hydraulic clamping unit provides strong and stable clamping force to fit large-size moulds for 4000L tanks. The clamping structure is optimized with high rigidity frame and wear-resistant guide components, ensuring stable locking action under heavy load, reducing vibration during long-time continuous operation and extending the service life of moulds and mechanical parts.

The plasticizing units are precisely designed for large-volume co-extrusion. Each extruder features high-efficiency screw and barrel structure, which realizes stable plasticization, uniform melt temperature and low shear heat generation. Raw materials can be fully melted and homogenized without material degradation. The die head is specially customized for three-layer co-extrusion, adopting a streamlined runner design to ensure smooth material flow of three layers, stable layer combination and no interlayer mixing. The interface of each layer keeps neat and consistent, securing stable barrier effect of finished containers.

Human-machine interaction is realized through a touch screen control system. Operators can set production parameters, monitor running status, check historical production data and view alarm information on the interface. The system supports parameter storage for different tank specifications. Once the mould is replaced, users can quickly recall saved formulas to shorten mould change and commissioning time. Multiple safety protection mechanisms are built in, including pressure overload protection, position limit interlock, emergency stop button and safety door lock. The equipment will trigger alarm or stop automatically under abnormal working conditions to protect operators and machine components.

This machine supports flexible customization. Customers can choose different configurations for extrusion capacity, mould size, cooling system and raw material feeding mode. The closed-loop cooling system accelerates product cooling and shaping, shortens cycle time and improves daily output. The machine frame undergoes stress relief treatment after welding to prevent deformation after long-term heavy-load operation. All key hydraulic and electrical components adopt reliable brands with stable supply and convenient after-sales maintenance.

Huayu has rich experience in large blow moulding equipment manufacturing. Every unit goes through strict assembly, debugging and test running before delivery. We conduct no-load test and trial production test with moulds to verify all functions and product forming quality. Our technical team provides on-site installation guidance, operator training and long-term technical support. Users can get systematic training covering machine operation, daily maintenance, common fault judgment and parameter adjustment.

The finished 4000L three-layer tanks produced by this machine have advantages such as high impact resistance, good sealing property, low leakage risk and long service life. They can replace metal containers in many scenarios, cutting down maintenance and anti-rust cost. This 4000L 3-layer blow moulding machine is an ideal investment for enterprises that need mass production of large multi-layer plastic tanks. It balances high production capacity, stable product quality and controllable operating cost, helping customers expand their product lines and gain stronger competitiveness in the global large plastic container market.