Huayu HYBM-500L-3 3-Layer Co-extrusion Blow Moulding Machine, Automatic HDPE Water Tank Blow Molder

This Huayu 500L three-layer accumulator blow moulding machine is specially developed for the production of large-volume hollow plastic products, such as HDPE water storage tanks, chemical liquid drums, fertilizer containers and other industrial hollow vessels with a maximum capacity of 500 litres. Adopting advanced three-layer co-extrusion technology, this equipment can form plastic products with a composite structure in one single blow, which greatly optimizes the barrier performance, mechanical strength and anti-aging property of finished barrels and tanks, meeting strict requirements for chemical packaging, water storage and outdoor long-term use.

Different from single-layer blow moulding equipment, the 3-layer co-extrusion structure allows users to configure different raw material formulas for each layer flexibly. The inner layer can use food-grade virgin HDPE resin to ensure sanitation and non-toxic contact with drinking water or liquid materials; the middle layer can add anti-ultraviolet masterbatch, anti-static additive or recycled plastic material to reduce production cost while improving rigidity and impact resistance; the outer layer can adopt high weather-resistant formula to resist sunlight radiation, rain erosion and temperature fluctuation when products are placed outdoors for years. This layered design brings obvious advantages that single-layer barrels cannot achieve, making the final products less prone to cracking, leakage, fading and permeation.

The machine is equipped with a high-precision accumulator die head matched for three-layer co-extrusion. The flow channel inside the die head is finely polished and optimally designed to guarantee uniform plastic melt flow of each layer. It effectively avoids layer deviation, uneven wall thickness and local thin spots on the parison. The parison wall thickness control system supports multi-point continuous adjustment along the vertical direction. Operators can set wall thickness curves on the human-machine touch screen according to product mould structure, so that thick reinforcement positions get enough material and unnecessary parts save raw materials, lowering material consumption and improving product qualification rate.

The host frame is welded with thick steel plates and treated by stress relief annealing. The whole structure is solid and shock-resistant, which can keep stable operation under long-time continuous heavy-load production. The hydraulic system adopts servo hydraulic drive scheme. Compared with traditional fixed pump hydraulic systems, servo hydraulic control adjusts output power according to real working demand. It cuts down idle energy consumption, reduces oil temperature rise and lowers running noise. Stable hydraulic output ensures consistent clamping force, fast mould closing and opening action, reliable blow pin movement and smooth parison feeding. The clamping unit uses heavy-duty linear guide rails for horizontal movement, with small friction, high positioning accuracy and long service life. Large clamping force can tightly lock moulds to prevent flash during high-pressure blowing.

The extrusion system is composed of three independent extruders corresponding to three material layers separately. Each extruder is fitted with a high-efficiency screw and barrel matched for HDPE processing. The screw structure is optimized for large melt output and good plasticizing effect. Raw materials can be fully melted, homogenized and plasticized steadily without overheating decomposition. Temperature zones of the barrel are controlled independently with high-sensitivity temperature sensors and heating modules. Temperature deviation can be controlled within a small range, avoiding unstable melt quality caused by overheating or insufficient plasticization. Each feeding hopper can be equipped with an optional auto-feeding device, conveying pellet materials automatically to reduce manual feeding work and keep production continuity.

The control system runs on a stable industrial touch interface. All production parameters including extrusion speed, accumulator charging time, parison length, wall thickness curve, clamping speed, blowing pressure, holding time and cooling time can be set, stored and recalled directly on screen. Multiple sets of product recipe data can be saved, so operators can switch between different moulds and products quickly without repeated debugging. The system integrates multiple safety protection functions: emergency stop button, mould opening protection, pressure overload alarm, temperature abnormal alarm and motor overload protection. Once abnormal signals are detected, the machine will trigger prompt alarms or stop actions automatically to protect operators, moulds and main components.

This 500L three-layer blow moulding machine supports matched customization according to customer demands. Optional configurations include automatic deflashing unit, product leak testing station, mould cooling water centralized control system, chiller, material mixer and residual flash crushing recycling machine. It can form an automatic production line together with auxiliary machines, greatly improving overall production efficiency and reducing manual intervention.

It is widely applicable for plastic processing factories that produce water tanks, chemical packaging barrels, liquid storage containers and agricultural plastic vessels. Finished products made by this machine can be used in drinking water storage, chemical reagent packaging, agricultural liquid storage and outdoor water supply projects. The equipment features easy maintenance, convenient spare parts replacement and clear operation logic. Our technical team provides on-site installation guidance, machine commissioning, operator training and long-term after-sales support, helping buyers master equipment operation, daily maintenance and simple fault troubleshooting rapidly.

Huayu has rich experience in designing and manufacturing large hollow blow moulding equipment. This 500L three-layer co-extrusion model balances production capacity, product quality and investment cost well. It is a cost-effective choice for manufacturers who want to upgrade from single-layer production to high-value multi-layer barrier plastic containers, helping customers produce competitive hollow plastic products and expand market share in industrial packaging and water storage fields.