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 Introduction
1. Performance Overview
The MT-DZ-XL-S2-01 is a fully automated functional testing system designed for high-speed production environments, with a maximum inspection capacity of 300 packs per minute. It adopts a contact-based online testing method that directly and precisely measures the internal pressure characteristics of packaged products, delivering stable and reliable data. Compared with similar systems both domestically and internationally, it offers higher testing accuracy.
At the heart of the system is its belt-squeeze detection technology, developed and refined over more than ten years of research and application. During conveying, a flexible belt mechanism applies controlled pressure to the product. A side-mounted sensor then detects the internal pressure response, which is converted into a digital signal by the controller and processed to evaluate the product’s internal pressure and sealing quality.
2. Applicable Products
Cartons or pouches containing liquid nitrogen
Plastic packaging bags containing gas or vapor
Liquid aluminum foil stand-up pouches
3. Inspection Functions
Identification of leakage caused by defective seals
Detection of low pressure or excessive bulging in packaging
4. Key Features & Specifications
Automatic tracking of production line speed; the system halts when the line stops to avoid product bursting or jams.
Inspection throughput exceeding 300 packs per minute.
Compatible with high- and low-pressure product testing.
Pressure measurement accuracy up to ±0.02 MPa.
High-speed testing capability.
User-friendly HMI (Human-Machine Interface).
Real-time dynamic display of multiple rejection data sets.
Visual alarm system for abnormal impacts.
Full Chinese-language interface.
Proprietary Maotong DSP-based digital signal processing algorithm.
24/7 remote technical support.
Automatic continuous rejection shutdown function.
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
We integrate a front-end guiding mechanism that pre-compresses the product to maintain a stable pressure before inspection. If leakage is present, the system allows maximum pressure release and measures the residual pressure at the discharge end. For intact products, the pressure variation remains minimal, while defective or poorly sealed products exhibit significant deviation from the normal pressure range. This approach ensures highly reliable detection of leaks and sealing defects.
7. Detection Principle
As each product moves along the conveyor, it is first detected by a positioning sensor, which records its unique ID and the real-time encoder signal through the control unit. The sensor then activates the force sensor, which captures the instantaneous pressure applied by the product against the belt. This pressure data is transmitted via the network to the Maotong signal processing board, where it is analyzed and processed. The results are simultaneously displayed on the human-machine interface (HMI) and sent to the control unit. If a rejection condition is confirmed, the control unit instructs the rejector to remove the product with the corresponding ID that fails to meet the pressure criteria.
II. Equipment Installation
1. Loading, Unloading, and Storage
During transportation, the equipment must be securely packaged and fastened, with particular attention to protecting the sensor from external force or tension. The machine should be wrapped in moisture-proof, impact-resistant material to prevent scratches, dents, or water ingress, and it must be firmly fixed to the transport vehicle to avoid movement damage.
When unloading, use specialized handling equipment and ensure the machine is properly secured to prevent slipping. During both storage and use, the environment must comply with specified conditions: relative humidity 10%–80% and temperature 0°C–50°C.
2. Installation Requirements
2.1 Ensure the machine is placed horizontally, with the clamping conveyor belt aligned parallel to the bottom conveyor belt.
2.2 Before powering on, inspect all cable connections and confirm the rack control box is properly grounded.
2.3 Power supply: single-phase AC 220V, 50Hz; total power 250W.
2.4 Compressed air: 4–8 bar; quality must comply with industry standards.
2.5 For best testing performance, it is recommended to inspect products after cooling, with the system installed on a 1.5–2 m straight conveyor section.
3. Structure and Specifications
Dimensions: As illustrated above
Frame: Constructed from 304 stainless steel, integrated with conveyor
Weight: Approx. 100 kg
III. Safety Guidelines
Before operation, observe the following precautions:
3.1 Operation is permitted only by trained personnel.
3.2 Maintenance may only be performed by professionally trained staff.
3.3 Ensure all safety warnings and protective devices are in place before starting the system.
3.4 Do not operate with the cover open; only open after disconnecting power and compressed air.
3.5 Keep hands away from the reject cylinder connecting rod assembly while running.
3.6 Do not obstruct or touch the photoelectric sensor during operation to avoid false triggering or injury.
3.7 Do not disconnect any electrical connections while powered on to prevent component damage.
3.8 Use warning tags when servicing to avoid accidental injury.
3.9 Ensure both the system and external devices are powered off before making connections; restore power only after secure connection.
3.10 As internal electronics are sensitive to static electricity, ensure proper grounding of the machine frame and control cabinet.
