In the fast-moving consumer goods packaging sector, the production of thin-wall small buckets (such as ice cream tubs, paint buckets, sauce buckets, etc.) places extremely stringent demands on injection molding equipment. These products typically have wall thicknesses of only 0.3mm to 1.2mm, and the melt cools extremely rapidly within the mold cavity. If the injection molding machine's response speed is even slightly slow, defects such as short shots and cold marks will result. Targeting this pain point, Lisong thin-wall packaging dedicated injection molding machines provide a professional solution for high-speed precision molding of thin-wall small buckets through the coordinated design of an ultra-high-speed injection system and a high-rigidity clamping structure.

 

 

Ultra-High-Speed Injection System Overcomes Thin-Wall Filling Challenges

 

      The core challenge in thin-wall small bucket molding is that the melt must complete cavity filling within milliseconds; otherwise, the melt will prematurely solidify in the runner, causing short shots or uneven wall thickness. Lisong thin-wall dedicated injection molding machines are equipped with a high-speed injection system with a maximum injection speed of up to 500mm/s. Combined with optimized oil circuit and valve group design, the screw achieves faster injection speeds at the same energy consumption. This injection speed level ensures that commonly used materials such as PP can fill narrow, long thin-wall cavities in an extremely short time, fundamentally eliminating material shortage at bucket wall edges and corners.

 

 High-Rigidity Clamping Structure Ensures Product Consistency

 

      Thin-wall small buckets are typically produced using multi-cavity molds to increase capacity, which places higher demands on clamping system stability. Lisong thin-wall machines adopt a thickened high-rigidity frame and an optimized mechanical direct-pressure clamping architecture. The tie bars undergo precision heat treatment, and template parallelism is strictly controlled, ensuring uniform and stable clamping force transmission. Under high-pressure injection conditions, template deformation is negligible, and each cavity of the multi-cavity mold receives consistent force, effectively improving common defects such as uneven bucket wall thickness and edge flash. The large mold capacity design is compatible with high-efficiency multi-cavity molds such as 8-cavity and 12-cavity configurations, helping packaging manufacturers increase per-machine capacity through multi-cavity molds.

 

Servo Energy-Saving System Reduces Overall Operating Costs

 

      Thin-wall small buckets belong to the category of high-volume continuous production, and energy costs account for a relatively high proportion of total production costs. Lisong thin-wall dedicated injection molding machines are equipped with a fully closed-loop servo hydraulic system. Unlike traditional fixed-displacement pumps that supply oil at full load throughout the process, the servo system outputs power on demand and automatically reduces speed during idle periods, reducing energy consumption by 25% to 35% compared to traditional hydraulic models. Taking a thin-wall small bucket production line with an annual output of one million units as an example, a single machine can save tens of thousands of yuan in electricity costs per year, and the energy-saving benefits are considerable over long-term mass production.

Precision Temperature Control Ensures Bucket Molding Quality

      Thin-wall small buckets have extremely high requirements for the stability of the raw material's molten state. Temperature fluctuations will directly cause bucket yellowing, brittleness, or poor mold filling. Lisong adopts infrared nano energy-saving heating coils combined with independent temperature control for each barrel zone, achieving temperature control accuracy of ±1°C, precisely locking each zone at the optimal melting range for the raw material. The nozzle's independent temperature control and anti-cold-plug design effectively eliminate defects such as gate stringing and cold slug points. Verified by customers, after using Lisong equipment, the defect rate of thin-wall products can be reduced to within 1.5%, significantly improving raw material utilization.

V. Dedicated Solutions Adapt to Diverse Needs of Bucket Products

      Lisong has launched a dedicated injection molding machine series for the bucket injection molding field, with clamping forces ranging from 220 tons to 1000 tons, meeting the diverse production needs from small and medium-sized sauce buckets to large industrial buckets. The equipment supports multi-cavity mold configurations and, combined with automated take-out and stacking systems, can achieve 24-hour continuous unmanned production. For application scenarios such as thin-wall small buckets that require both efficiency and quality, Lisong can provide full-process technical support from machine selection to production solutions, helping customers reduce costs and increase efficiency while ensuring delivery schedules.