Double the Efficiency of Drawstring Bag Production with JUNCAUTO PLC!
Release Time：
2025-03-19 10:11
Application
Drawstring bag making machines are widely used in the food, chemical, pharmaceutical, and daily chemical industries to produce plastic bags in various sizes, such as garbage bags, rice bags, flour bags, animal feed bags, fertilizer bags, and more.
JUNCAUTO Application
Click the video below to see how the Drawstring Bag Making Machine works with the JUNCAUTO automation solution.
Key Processes
Automatic Feeding
The system precisely controls the feeding speed according to the cutting frequency, ensuring consistent material length and stable feeding.
Heat Sealing & Cutting
Based on the preset inverter parameters, the system controls continuous heat sealing and cutting for fast and accurate bag production.
Rope Threading
The system drives the threading mechanism to accurately insert the rope into the bag opening, ensuring consistent positioning and secure threading.
Punching
The punching cylinder is controlled according to the bag specifications, creating accurately positioned holes for a neat and clean bag opening.
Winding
The system coordinates the different mechanisms to neatly wind the finished bags for easier packaging and handling.
JUNCAUTO Solution
Main Control Architecture
The system uses a virtual axis as the master axis and applies a customized CAM profile to plan the motion curve of the traction axis.
The traction axis also serves as the master axis for both the unwinding and rewinding axes. The FOLLOW command is used to achieve synchronized unwinding and rewinding.
Key Challenges & Solutions
1. Floating-Roller Tension Control
The two axes on the left and right sides of the floating roller control the material pulling and feeding respectively.
A sensor beneath the floating roller detects the material position and helps determine the current tension.
So, how do we maintain constant material tension during continuous operation?
JUNCAUTO uses its proprietary FOLLOW command to keep the feeding axis continuously synchronized with the pulling axis.
It provides fast response, precise coupling, and real-time synchronization with the master axis. The gear ratio between the two axes can also be adjusted in real time while the command is running.
2. Solving Material Rebound
When the pulling speed increases and then suddenly stops, inertia can cause excess material to accumulate at the feeding end, making it difficult to keep the material properly tensioned.
To address this issue, JUNCAUTO uses a customized CAM command to create the desired motion profile.
The pulling axis acts as the master axis. During rapid pulling, the system gradually reduces the speed and maintains a short idle-speed section, allowing the servo to keep the material tension stable and consistent.
3. Registration Mark Tracking
The virtual axis drives the traction axis using a customized CAM profile, making it easier to optimize the slave-axis speed curve.
In fixed-length mode, the CAM table is configured according to the required feeding length to control the material feeding distance.
In registration mark tracking mode, the system detects the mark position, writes the measured length into the CAM table, and plans the deceleration/idle distance.
This helps improve mark-stopping stability at high speeds and ensures more accurate positioning during continuous production.
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