Lisong PET Preform Injection Unit: The Core Power Driving High-Speed and Precision Production

      In the era of rapid development of the global packaging industry, the production of PET preforms is moving towards higher speed, higher precision and higher efficiency. As the core execution unit of the injection molding machine, the injection unit directly determines the production efficiency, product quality and production stability of PET preforms. Lisong, as a leader in the field of high-speed PET preform injection systems, has built a high-performance PET-dedicated injection unit with cutting-edge technology and innovative design, breaking the bottlenecks of traditional production, and becoming the core power for manufacturers to achieve high-quality and large-scale preform production.

 

PET-Dedicated Twin-Screw Design: Integrating Multiple Processes for Efficient Plasticizing

      The core of Lisong's PET preform injection unit is the PET-dedicated twin-screw injection system, a tailor-made core component for the characteristics of PET materials—thermosensitivity, high crystallinity and narrow processing window. Different from the traditional single-screw structure, this twin-screw system innovatively integrates plasticizing, injection and holding pressure into a smooth and continuous process, fundamentally solving the problems of uneven plasticizing, long cycle time and poor product consistency caused by discontinuous processes.

      The low-speed and high-speed operation design of the twin-screw not only ensures the full melting and uniform mixing of PET raw materials, but also precisely inhibits the generation of acetaldehyde during the processing, effectively ensuring the purity of the preform and meeting the strict quality requirements of food-grade and medical-grade preform production. At the same time, the integrated process eliminates the waiting time of traditional storage and feeding, greatly shortens the single molding cycle of the preform, and significantly improves the overall production efficiency of the equipment.

High-Precision Drive Configuration: Balancing Extreme Precision and Energy Saving

      Lisong adheres to the design concept of "precision first, energy saving as standard", and provides two high-precision drive solutions for the injection unit to meet the diversified production needs of customers.

      The standard hydraulic drive system is equipped with a high-efficiency accumulator and advanced servo valve control technology, which can provide stable and powerful injection power, ensure high-speed injection up to 800mm/s, and realize precise control of injection pressure and speed. The repeat positioning accuracy of the system is extremely high, which can control the weight deviation of the preform within an ultra-small range, and ensure the consistent appearance and size of each cavity product even in the high-cavity production of 144 cavities.

      For high-end preform production scenarios with extremely strict requirements on weight consistency, appearance finish and energy consumption, Lisong provides an optional electric screw drive solution. This all-electric drive structure abandons the traditional hydraulic oil circuit transmission, realizes direct drive of the injection screw, and further improves the control precision of the injection process. At the same time, the electric screw drive can reduce the unit energy consumption of the equipment by more than 35% compared with the traditional hydraulic injection machine, making the production process more energy-saving and environmentally friendly, and helping manufacturers significantly reduce production costs while pursuing high precision.

Multi-Dimensional Optimization Design: Adapting to High-Speed Mass Production

      Lisong's PET preform injection unit is not only excellent in core structure, but also has a number of humanized and professional optimization designs in supporting components and process control, creating a solid foundation for continuous high-speed mass production.

1. Multi-zone temperature precise control

      A number of independent temperature control zones are set up on the material barrel of the injection unit, and the temperature of each zone is accurately controlled with a deviation of ≤3℃. Combined with the infrared energy-saving heating device, it not only ensures the stable plasticizing temperature of PET materials, avoids material decomposition and yellowing caused by local overheating, but also greatly reduces heat loss and improves the energy utilization efficiency of the whole machine.

2. Closed material barrel and anti-contamination design

      Adopting a fully enclosed material barrel structure, it effectively prevents the PET raw materials from being polluted by dust and impurities during the plasticizing and injection process, and the clean level reaches Class 1000, which fully meets the production standards of food packaging and medical consumables preforms. The oil-free design of the whole unit is perfectly matched with Lisong's advanced clamping system, completely avoiding oil contamination in the production process and ensuring the hygiene and safety of the preform.

3. High-adaptability structural design

      The injection unit is designed with a modular structure, which can be flexibly matched with Lisong's full range of PET preform injection molding machines with clamping forces from 1,000 kN to 6,000 kN, adapting to preform production from 24-cavity small layout to 144-cavity large layout. Whether it is small water bottle preforms, cosmetic container preforms or large oil and beverage bottle preforms, it can provide matching injection power and process parameters to achieve customized production.

Intelligent Linkage: Empowering Industry 4.0 Production

      As an important part of Lisong's high-speed PET preform injection system, the injection unit is deeply integrated with the equipment's intelligent control system, realizing real-time data collection, monitoring and remote management of the injection process. The operating parameters such as injection speed, pressure, plasticizing time and holding pressure of the unit can be adjusted and optimized in real time through the central control system. Combined with AI algorithm, the system can automatically optimize the injection process parameters according to the production situation, further shorten the molding cycle and improve product yield.

      At the same time, the injection unit supports seamless connection with automated peripheral equipment such as mold post-cooling manipulators and high-efficiency raw material drying systems. It can form a fully automated production line from raw material feeding to preform output, realizing unmanned operation of the whole process, greatly reducing labor costs, and making preform production more intelligent and efficient.

Backed by Professional R&D: Global Technical Support

      The excellent performance of Lisong's PET preform injection unit comes from the strong technical strength of Lisong's R&D team. The team is led by experts from China's National Thousand Talents Program, and has gathered technical backbones with rich experience from top international enterprises such as Husky. It has more than 40 patented technologies in the field of high-speed injection systems, and continuously iterates and optimizes the design of injection units based on the actual production needs and industry development trends of global customers.

      Lisong's modern manufacturing base in Ningbo and a perfect global service network provide all-round technical support for the injection unit. From the initial process matching, equipment debugging to the later daily maintenance, spare parts supply and process optimization, the professional technical service team can provide quick response within 24 hours, ensuring that the injection unit is always in the best operating state, and escorting the continuous and stable production of customers around the world.

Conclusion

      The injection unit is the "heart" of the PET preform injection molding machine, and it is the key to determining the production efficiency and product quality of preforms. Lisong's PET preform injection unit, with its PET-dedicated twin-screw design, high-precision drive configuration, multi-dimensional optimization design and intelligent linkage capability, perfectly interprets the core advantages of "high speed, high precision, high efficiency and energy saving". It not only solves the pain points of traditional preform production such as low efficiency, poor consistency and high energy consumption, but also provides a reliable core component support for manufacturers to adapt to the high-speed development of the packaging industry.

      In the global market where the demand for PET preforms is growing rapidly, Lisong always adheres to the concept of "better performance meets lower costs". With the injection unit as the core, it builds a complete high-speed PET preform injection system, helping global manufacturers break through production limits, improve market competitiveness, and jointly drive the future development of the global PET preform production industry.