Food bag leak detection machine
1.Using extrusion method and advanced force analysis algorithm, the fastest output can reach 400 bags / min.
2.It is suitable for nitrogen flled and other inflatable bagged food products
I. Product Overview
1. Performance Description
The MT-DZ-XL-S2-01 is a fully automatic functional testing system designed to achieve inspection speeds of up to 300 packs per minute. It employs a contact-based, online detection method that directly measures and accurately reflects the internal pressure characteristics of product containers, ensuring stable and reliable sampling data. Compared with similar equipment on the domestic and international market, it delivers higher testing precision.
The system is built on belt-squeeze detection technology, perfected through over a decade of research and industrial application. As products move along the conveyor, a flexible belt mechanism applies uniform pressure. A side-mounted sensor records the internal pressure response, which is then converted into digital data by the controller. This data is analyzed to determine the product’s internal pressure stability and sealing integrity.
2. Applicable Products
Cartons or pouches containing liquid nitrogen
Plastic bags filled with gas or steam
Liquid aluminum foil stand-up pouches
3. Inspection Functions
Detection of leakage due to defective seals
Identification of abnormal bag pressure, including underpressure and excessive bulging
4. Main Features and Technical Parameters
Automatic speed synchronization with production line; system stops when the line halts to prevent bursting or jamming.
Inspection capacity of >300 bags per minute.
Suitable for both high-pressure and low-pressure product inspection.
Pressure detection accuracy: ±0.02 MPa.
Reliable high-speed testing capability.
Intuitive HMI (human-machine interface) for simplified operation.
Real-time display of multiple rejection records.
Visual alarm system for abnormal impacts.
Full Chinese-language menu and operation interface.
Exclusive Maotong DSP-based digital signal processing technology.
24/7 remote technical support.
Automatic continuous rejection and shutdown protection.
serial number
| Test contents | Test Description | Rejection rate
| False rejection rate
|
1 | Bag leakage | Improper sealing or leakage caused by material jamming | ≥99.98% | ≤0.05% |
2 | Bag pressure | Bagging pressure after sealing is too low or too high, deviating from the normal value by ±0.02 MPa | ≥99.93% |
6. Schematic diagram of equipment extrusion
Front-End Guide Mechanism
A front-end guiding system is incorporated to pre-compress the product, ensuring it maintains a stable internal pressure before inspection. In the case of leakage, pressure is released as much as possible and the remaining pressure is measured at the discharge end. For well-sealed products, the pressure variation remains within a normal range, whereas products with leaks show significant deviations from the standard pressure profile. This approach provides a reliable method for identifying leaks and seal integrity issues.
7. Detection Principle
As each product moves along the conveyor belt, it is first detected by a positioning sensor. The sensor records the product’s ID and the current encoder signal via the control unit. It then triggers the force sensor, which measures the instantaneous pressure exerted by the product against the conveyor belt. The collected pressure data is transmitted through the network to the Maotong signal processing board, where it is analyzed. Results are simultaneously displayed on the HMI (Human-Machine Interface) for real-time monitoring and forwarded to the control unit. Once a defective product is identified, the control unit signals the reject mechanism to remove the specific product corresponding to the recorded ID.
II. Equipment Installation
1. Transportation, Handling, and Storage
During transport, the equipment must be securely fastened and packaged.
Special care should be taken to prevent external pressure or stress on the sensors.
The unit should be wrapped in moisture-proof and impact-resistant material to prevent scratches, dents, or water damage.
Secure the machine to the transport vehicle to avoid shifting or vibration damage.
When unloading, use appropriate handling equipment and ensure stability during transfer.
Storage and operating environment requirements: Relative humidity: 10–80%; Temperature: 0–50°C.
2. Installation Requirements
2.1. Position the machine horizontally, ensuring the clamping conveyor belt is parallel to the product’s base conveyor.
2.2. Before powering on, check all cable connections and confirm the rack control box is properly grounded.
2.3. Power connection: Single-phase AC 220V, 50Hz; total power 250W.
2.4. Air supply: 4–8 bar, meeting industry-standard quality requirements.
2.5. For best accuracy, test products after cooling. Install the equipment on a straight conveyor section of 1.5–2 meters.
3. Structure and Specifications
3.1. Overall dimensions: As shown in reference diagram.
3.2. Frame: 304 stainless steel, mounted on a conveyor system.
3.3. Weight: Approx. 100 kg.
III. Safety Guidelines
Before use, observe the following precautions:
3.1. Only trained operators may use the equipment.
3.2. Maintenance must be carried out by qualified personnel.
3.3. Confirm all protective devices and warning labels are in place before starting.
3.4. Do not operate with the cover open; disconnect power and compressed air first.
3.5. Keep hands away from the reject cylinder’s connecting rod while in operation.
3.6. Do not block or touch the photoelectric trigger switch during operation to avoid false rejection and injury.
3.7. Do not unplug electrical connections when powered on to prevent component damage.
3.8. Place visible warning tags during servicing to prevent accidents.
3.9. Ensure both the machine and external devices are powered off before connection; restore power only after secure connections are made.
3.10. As the electronics are sensitive to static electricity, ensure proper grounding of the frame and control cabinet.
