Can bottom code inspection machine
1.Multi module, no dead angle detection
2.A self-developed detection software system, stable detection, fast processing, maximum detection speed of up to 1200 cans/ min
3.Independent research and development of image processing algorithm can accurately identify code, high precisio n identification
I. Equipment Overview
1. Application
This system is designed for inline inspection of inkjet printing on can bottoms in high-speed can production lines. It automatically identifies and rejects cans with defective or missing bottom codes.
2. Key Features
Non-contact, online inspection technology that ensures no damage to cans.
High-speed performance with inspection capability of up to 72,000 cans per hour.
Advanced recognition functions supporting date codes (year, month, day), fixed data (e.g., factory codes TN, HB, GM, HG, “Qualified,” anti-counterfeiting codes), and error correction. The system can auto-adjust date codes without manual intervention.
Intuitive HMI (Human-Machine Interface) with multi-level access control.
Fast and efficient training for new code patterns.
Encoder-based synchronous counting system ensures precise rejection even if the line speed fluctuates or stops.
Built-in industrial-grade air-conditioning maintains stability during extended operation in high-temperature environments.
Functions can be customized according to customer production needs.
Automatic defect photo storage, organized daily with adjustable retention periods.
Latest-generation Maotong inspection software effectively filters interference from can-bottom logos or scratches, minimizing false rejects.
Continuous rejection and auto-stop function for quality assurance.
24/7 remote access for monitoring and control.
Full 360° coding inspection with no blind spots.
Zero-delay detection, avoiding false rejects caused by cans rubbing, jamming, blocking, or manual placement on the line.
II. Detection Capabilities
Code presence verification – including detection of missing prints, cover prints, or inverted cans.
Blurred code detection – identifies characters that are smeared or unreadable to the human eye.
Error detection – identifies incorrect date codes, factory codes, and anti-counterfeiting codes.
Missing character detection – accurate recognition of missing elements greater than 20%.
Character recognition – reads and interprets inkjet printing information.
Position deviation detection – flags codes outside preset positional tolerances.
Duplicate code detection – identifies multiple identical codes.
Note: The system offers a unique advantage in detecting inkjet printing errors and individual character faults. For verification, a simple test involves re-running cans produced on a previous day through the line; the inspection system will accurately reject those with incorrect date codes.
3. Installation location
4. Detection principle
A Gigabit Ethernet digital camera takes photos from above, digitally analyzes the captured images, and rejects unqualified cans.
Cans pass a positioning sensor, which detects their arrival. The control unit records the can's identification number and the current encoder signal. The positioning sensor triggers the digital camera to capture the image of the can's current coding and transmits it to the image processor via the network. The image processor processes and analyzes the received image and transmits the results to both the human-machine interface for dynamic display and the control unit. Upon receiving the unqualified signal, the control unit notifies the rejector to remove unqualified cans with the corresponding identification number online.
V. Equipment Configuration and Inspection Accuracy
(I) Equipment Specifications
A. Technical Parameters
Equipment Name: Inkjet Printing Inspection System
Model: MT-YLG-OCR-03
Maximum Production Speed: 72,000 bottles/hour (servo-controlled rejection when exceeding 72,000 BPH)
Inspection Scope: Inkjet print quality
Rejection Method: High-precision online rejection of defective cans identified by the inspection unit
Safety Rating: IP65
B. Primary Applications
This system is widely applied in beverage can production lines for the inspection of inkjet codes on cans, ensuring defective products are identified and automatically rejected.
C. Key Technical Advantages
Labor optimization – reduces reliance on manual inspection, lowering workforce requirements and production costs.
Efficiency gains – enhances production throughput while maintaining high quality standards.
Standards compliance – inspection accuracy fully meets the manufacturer’s technical specifications and quality benchmarks.
D.Detection accuracy:
serial number
| Inspection Items | Testing conditions and accuracy
| Rejection rate
| False kick rate
|
1 | Inkjet Printing Inspection | -- | -- | < = 0.03% |
1.1 | No inkjet printing (printed on the cover, missing inkjet printing, can inverted) | -- | >99.99% | |
1.2 | Missing inkjet printing | Single character > 20%
| >99.8% | |
1.3 | Fuzzy inkjet printing | The human eye cannot recognize the inkjet characters
| >99.93% | |
1.4 | Incorrect inkjet printing | Wrong production date, wrong factory code, wrong security code, deformation (elongation or shortening)
| >99.99% | |
1.5 | Position offset | Beyond the expansion zone
| >99.99% | |
1.6 | Duplicate inkjet printing | Multiple code printing in the code area
| >99.99% |
Note: The rejection rate for the "No Coding" test item in the table indicates that for every 10,000 cans tested, there may be one that is not rejected. This is theoretical experimental data, and the same applies to other test items. The above test items are tested on a real-time basis for each can, not just during shift handovers.
