What Is an Automatic Big Bag Packing Machine? Structure and Working Principle

An automatic big bag packing machine is a highly integrated system designed for filling, weighing, sealing, and handling large flexible intermediate bulk containers (FIBC). It enables fully automated operation from empty bag handling to final palletizing, making it a key piece of equipment in modern bulk material processing lines.

Main Components
The Henll automatic big bag packing machine consists of multiple functional modules covering the entire packaging process:

• Pallet Destacking Module: Separates and feeds empty pallets for downstream operations 
• Automatic Bag Feeding Unit: Picks and opens individual big bags 
• Vision-Guided Bagging Robot: Uses vision systems to locate the bag inlet and perform automatic bag placing 
• Gross Weighing Filling System: Ensures accurate filling with real-time weight measurement 
• Vacuum & Sealing Unit: Performs de-aeration and sealing (heat sealing or tying) 
• Bag Shaping Unit: Compresses and reshapes filled bags for a uniform structure 
• Pallet Handling & Wrapping System: Completes palletizing, pallet circulation, and stretch wrapping 
• Central Control System: Integrates PLC and HMI for full-process control 

Working Principle
The operation process is fully automated and follows a sequential workflow:
First, the pallet destacking module separates empty pallets and transfers them to the working station. The automatic bag feeding unit then picks and opens each big bag. Using an AI-based vision system, the machine identifies the bag inlet position and guides the robotic arm to perform precise bag placement.
Once the bag is in position, the gross weighing filling system starts feeding material according to the preset target weight. During filling, a dynamic compensation and check-weighing system continuously monitors weight changes to ensure high accuracy.
After filling is completed, the sealing unit automatically performs inner sealing and outer tying or heat sealing. The filled bag is then transferred to the shaping unit, where pressure is applied to the top and sides to achieve a stable and uniform shape. Finally, the bag is palletized and wrapped for secure storage and transportation.
The entire process is controlled by a centralized control system. Operators only need to set parameters via the touchscreen interface, enabling a fully automated, unmanned packaging operation from start to finish.