20L large plastic pails require a large single injection volume of HDPE material, with a long melt flow path from barrel to pail bottom, imposing extremely strict standards on machine plasticizing capacity, instantaneous injection speed and multi-movement coordination. Conventional general injection molding machines feature low plasticizing efficiency with sequential mold opening/closing, plasticizing and ejection movements, resulting in massive idle waiting time. The standard molding cycle of 20L pails in the industry generally exceeds 22 seconds, creating severe capacity bottlenecks for bulk orders. Factories have to purchase extra machines and expand workshops, which greatly raises fixed asset investment. LISONG GT series pail machines are equipped with dedicated high-speed injection units customized for 20L large pail molding material characteristics, integrating simultaneous plasticizing, high-speed filling and automation expansion to effectively shorten cycle time and greatly boost daily output per line. Fewer machines are required to fulfill identical order volumes, cutting workshop rent and frontline labor management costs simultaneously.

      LISONG GT is fitted with industry-specialized 24:1 large L/D ratio screw optimized for HDPE packaging materials, delivering stable high-flow plasticization. The maximum single-shot volume fully covers all material consumption of one 20L pail without segmented multiple injection, eliminating weld lines and enhancing overall impact and drop resistance to fully meet hazardous goods transportation safety testing standards. The screw adopts low-speed smooth melting technology with gentle and controllable shearing force to prevent high-temperature plastic decomposition and carbonization. Molded 20L pails are free of silver streaks, air marks and black spot impurities, enabling stable mass production of food-grade, medical-grade and chemical-grade packaging pails without extra manual defective sorting procedures.

      The whole machine is equipped with multiple independent servo power modules, and high-speed servo proportional valves are configured for mold opening/closing, injection, plasticizing and ejection to support parallel multi-movement operation, completely eliminating sequential waiting drawbacks of traditional machines. During product cooling, the machine simultaneously completes screw plasticizing, ejection mechanism reset and sprue separation to remove all idle waiting time. The molding cycle of standard 20L chemical pails can be steadily reduced to 16–18 seconds, lifting single-line output by over 20% compared with ordinary hydraulic toggle machines, adding thousands of pieces to daily output per machine and greatly improving order delivery efficiency.

      Standard reserved mounting holes for robots and sprue pickers are pre-set on the fixed platen at factory, enabling direct matching with large 3-axis automatic take-out robots without extra platen cutting or grinding modification. Pail demolding, conveying and stacking are completed synchronously upon mold opening with zero manual intervention, eliminating waiting time for manual picking and sorting. It adapts to fully automated dark factory production lines, drastically cutting frontline operator numbers and labor management costs. For popular lightweight thin-wall 20L pails and IML in-mold labeled colored pails, an optional nitrogen accumulator auxiliary injection module can be installed to deliver instant ultra-high injection speed, quickly filling the distant pail bottom and effectively solving defects such as short shot, surface sink marks and unclear patterns, helping enterprises explore high-end customized packaging markets and raise product premium.

      Meanwhile, GT series covers full clamping force range from 2200kN to 10000kN with sufficient mold accommodation capacity. One machine can flexibly switch molds for 10L, 20L, 33L chemical pails and matching sealing lids, satisfying multi-category production and boosting overall machine utilization. Standard tie-bar through holes and platen dimensions allow mainstream commercial single-cavity 20L pail molds to run directly without mold modification or tie-bar spacing adjustment, greatly shortening mold change downtime and perfectly suiting flexible multi-batch production demands of small and medium pail manufacturers. The universal 55mm standard tie-bar through holes eliminate secondary processing for common commercial 20L molds, improving commissioning efficiency and further reducing production line idle loss. The complete injection unit supports quick disassembly and assembly of screw components. It only takes half an hour to adjust when switching materials for pails of different weights, with little residual material during color and material change, greatly reducing material cleaning loss and offering better adaptability for small-batch and multi-specification orders. In summary, relying on clean hydraulic circuit, servo energy saving, low maintenance and intelligent control, LISONG GT pail machines lower comprehensive production costs for 20L pail manufacturers in long run, expand profit margins amid industrial competition and deliver a stable, efficient, green integrated molding solution for 20L plastic pails, Compatible with all domestic & eco-friendly plastic materials.