Double-Ring Drum Blow Molding Machine Popular Science

The double-ring drum blow molding machine is a large-scale forming equipment specially designed for producing double-ring plastic drums. These drums are named for the two annular reinforcing ribs in the middle of the drum body and are widely used in chemical, coating, ink, adhesive and other industries to hold various liquid chemical raw materials. The double-ring structure not only enhances the impact resistance and pressure resistance of the drum body but also facilitates handling and stacking, making it play an important role in industrial logistics. The double-ring drum blow molding machine is the core equipment for realizing efficient mass production of this special structure.
 
In terms of working principle, the double-ring drum blow molding machine follows the basic process of hollow blow molding but has been specially optimized for the complexity of the double-ring structure. Its production process mainly includes raw material pretreatment, melt extrusion, parison control, mold clamping, blow molding, cooling and setting, and demolding. Firstly, raw materials such as polyethylene (PE) enter the extrusion system after drying and mixing. Through the synergistic effect of the rotating shear of the screw and the heating device, the raw materials are melted into a uniform melt. Then, the melt is pushed to the die head and extruded to form a tubular parison. At this time, the equipment's wall thickness control system will accurately adjust the thickness of the parison at the double-ring parts to ensure the strength of the reinforcing ribs. Next, the mold with prefabricated double-ring grooves quickly closes, enclosing the parison. High-pressure air is injected into the parison through a blow pin, making the melt adhere to the inner wall of the mold, completely replicating the double-ring structure and details such as the threaded mouth and handle of the drum body. Finally, after rapid cooling and setting by the circulating water cooling system, the mold opens, and the formed double-ring drum is taken out. After trimming, leak detection and other post-processing procedures, it becomes a qualified product.
 
The technical highlight of the double-ring drum blow molding machine lies in the precise control of complex structures. Since the forming of the double-ring parts requires higher pressure and more uniform melt distribution, modern double-ring drum blow molding machines are generally equipped with servo-driven die heads and clamping systems, with a clamping force of up to several thousand kilonewtons, ensuring the stability when the mold is closed and avoiding flash or structural deformation caused by insufficient pressure. At the same time, the advanced electronic wall thickness control system can real-time monitor the thickness change of the parison at the double-ring parts. By dynamically adjusting the die gap, the wall thickness of the reinforcing rib parts is 10%-20% thicker than other areas, ensuring strength while avoiding raw material waste. In addition, the equipment has a high degree of automation, and unmanned operation can be realized from raw material feeding to finished product inspection. A single device can produce dozens of double-ring drums per hour, meeting the needs of large-scale production.
 
With the improvement of industry requirements for packaging safety and environmental protection, double-ring drum blow molding machines are also upgrading towards greenization and intelligence. New equipment adopts energy-saving heating systems, reducing energy consumption through infrared heating and thermal insulation design. At the same time, equipped with industrial sensors and intelligent control systems, it can real-time monitor parameters such as melt temperature, mold pressure, and blowing flow. Once an abnormality occurs, it will immediately alarm and adjust automatically, greatly improving the product qualification rate. In addition, for double-ring drums of different capacities (usually 20L-200L), the equipment can realize flexible production by quickly changing molds, adapting to the needs of multi-specification orders. It can be said that the technological progress of double-ring drum blow molding machines provides a solid guarantee for safe packaging and efficient logistics in the chemical industry.