In mass production of PET preforms, manufacturers are constantly confronted with prominent challenges: rising electricity charges lifting production costs, unstable preform weight in multi-cavity production, difficult control of acetaldehyde (AA) value, insufficient machine stability during long-term continuous operation, and frequent mould damage caused by rapid mould opening and closing. When selecting PET injection equipment, buyers no longer only focus on maximum injection speed or theoretical cavity quantity. Energy consumption cost, production consistency, long-term operational stability and maintenance expense have become decisive factors for investment decisions. Centered on real demands from end customers, Lisong dedicated PET high-speed injection molding machine integrates independent twin-screw injection system, direct-pressure clamping unit, 5E all-electric drive and infrared nano heating technology. While achieving ultra-high productivity, outstanding energy saving performance is realized, delivering economical molding solutions for domestic and overseas preform manufacturers.

      Energy cost constitutes a heavy long-term expenditure for PET factories. PET processing requires continuous high-temperature plasticization, and machines run 24/7. Cumulative ineffective power consumption constantly erodes profit margins. Conventional hydraulic machines keep motors running continuously. Large energy loss exists inside hydraulic circuits due to throttling, and power is wasted even during standby phases. Lisong PET series adopts servo on-demand driving architecture. On all-electric versions, five core movements (electric plasticizing recovery, electric mould opening/closing, electric mould clamping brake, electric injection and electric screw) are directly driven by servo motors. Power is consumed only during active movements, while power demand drops significantly during cooling waiting stage. Compared with traditional hydraulic injection machines, energy saving ratio reaches 20%–40%. Cooperated with infrared nano heating coils, thermal radiation loss of barrel is reduced and power consumption of heating zones is further optimized. Electric plasticizing recovery eliminates energy loss of hydraulic recovery, delivers faster plasticizing response and shorter cycle time, bringing dual benefits of power saving and productivity improvement. For factories with ten-thousand-ton annual preform output, electricity savings over years are considerable and shorten return on investment cycle effectively.

      Apart from energy efficiency, production consistency ranks high on customer priority list. In multi-cavity mould production, fluctuation of melt pressure and temperature leads to inconsistent preform weight among cavities, resulting in uneven wall thickness, whitening, bubbles and massive defective products. Lisong adopts proprietary independent twin-screw injection system. The plasticizing screw is responsible for melting and homogenization, while injection screw handles metering and high-speed filling. Two sets of mechanisms work independently, enabling simultaneous injection-holding and plasticizing recovery to eliminate process waiting time. Servo precise regulation on screws guarantees uniform melt plasticization. Low-temperature melting suppresses PET degradation and stabilizes AA value, satisfying strict requirements of drinking water bottles and food packaging preforms. Millisecond closed-loop control on pressure and position ensures consistent melt filling for every shot. Weight deviation of preforms is kept within narrow range under multi-cavity operation, raising yield rate and cutting raw material waste.

      Performance of clamping system directly determines mould service life and production stability. Many PET machines on market adopt toggle clamping structure. Deformation easily occurs after long-term high-speed reciprocating movement, uneven clamping force distribution brings flash risk in high-cavity production. Lisong applies patented direct-pressure clamping technology. Clamping force acts evenly on mould parting surface and template deformation is minimized. Equipped with highly sensitive low-pressure mould protection function, machine stops immediately once foreign matter is detected inside cavity. Expensive multi-cavity hot runner moulds are well protected and mould maintenance cost is lowered. Smooth and fast mould open/close movement realizes stable short cycle around 8–12 seconds, meanwhile mechanical impact is reduced, abrasion of mechanical components is relieved, extending machine service life and lowering later maintenance investment for factories.

      Long-term continuous operational reliability is highly valued by overseas clients and large-scale mass production factories. Most production lines run all year round, and any unexpected shutdown leads to output loss. Lisong PET machines are optimized on mechanical structure, electrical heat dissipation and hydraulic / electric system for non-stop 24-hour operation. Hybrid hydraulic-electric models are equipped with high-efficiency accumulators to meet ultra-high injection speed demand. Premium all-electric 5E versions eliminate hydraulic oil leakage risk, maintain clean production environment complying with food-grade production standards, and operate with lower noise to improve workshop working condition. Open data interface supports collection of production energy consumption, cycle time and reject rate data, facilitating digital factory management. Whether small and medium domestic preform plants or overseas projects in Southeast Asia, Middle East and Americas, machines can adapt to different voltage, cooling water quality and workshop conditions to maintain steady output.

      Ultimately, competitiveness of PET preform equipment lies in comprehensive production cost per preform. Lower energy consumption cuts electricity bills, higher yield saves PET raw material, shorter molding cycle raises hourly output, reliable performance minimizes downtime loss, and sufficient mould protection reduces maintenance expenditure. Instead of pursuing exaggerated single parameter, Lisong dedicated PET injection molding machine keeps optimizing around three core concerns: cost, quality and stability. It delivers performance comparable to world-renowned high-end brands with competitive purchasing and after-sales cost. As global energy-saving policies are promoted and prices of raw materials and energy fluctuate, selecting a PET injection machine balancing high-speed productivity and excellent energy efficiency will become a key advantage for preform manufacturers to build long-term market competitiveness.