Tetra Pak Printing Inspection
1.Self developed testing software, processing speed is fast,the fastest up to 36000 packets / hour
2.Replace labor, cost saving, high cost performance
3.Unique lighting design,not affected by th e paper package shading
I. Equipment Overview
1. Purpose
This system is designed for online inspection of inkjet printing and straw quality on paper-packaged products in the Linying Jiayin production line. Any defective items are automatically identified and removed from the line.
2. Key Features
Non-contact, real-time inspection that does not damage the product.
High-speed detection capability, handling up to 24,000 packages per hour.
User-friendly human-machine interface with multi-level access control.
Accurate rejection ensured by an encoder installed on the conveyor’s synchronous motor—unaffected by line stoppages or speed variations.
Built-in industrial-grade refrigeration and air-conditioning to prevent crashes or system errors during prolonged summer operation.
Customizable functions tailored to actual customer production requirements.
Automatic storage of daily defective product images with adjustable retention time.
Continuous rejection and line shutdown capability.
24-hour remote monitoring and support.
360° inkjet code inspection, minimizing blind spots.
Zero-delay inspection to avoid false rejections caused by scraping, jamming, or manual bag placement.
II. Detection Capabilities
Code presence (missing code, inverted package)
Blurred or unreadable code (garbled text, indistinct characters)
Incorrect code information
Missing characters
Character recognition (decoding and verifying code data)
Code position deviation (outside preset range)
Duplicate code detection (multiple identical codes)
Straw presence check (detects missing straws)
III. Installation Location
The system is installed on the conveyor 0.5–1.0 m downstream from the tube applicator, where both the inkjet print and straw can be inspected.
IV. Detection Principle
A Gigabit Ethernet digital camera captures top-down images of each package. The images are analyzed in real time, and defective items are flagged and rejected automatically.
When a package passes the positioning sensor, the system records its ID number and the corresponding encoder signal. The sensor then triggers the camera to capture an image of the package’s inkjet code and straw, transmitting it to the image processor via the network. The processor analyzes the data and sends results to both the HMI (for dynamic real-time display) and the control unit. If a defect is detected, the control unit instructs the rejector to remove the corresponding package.
Algorithm Principle:
The detection process leverages deep learning algorithms, minimizing the need for manual intervention. For on-site product model changes, approximately 300 sample images are sufficient for training. Our company builds the data model, and once all product variations are included, the system achieves truly foolproof detection. Example screenshots of the software interface are provided below.
V. Equipment Configuration and Inspection Accuracy
(I) Detailed Equipment Description
A. Technical Specifications
Equipment Name: Inkjet Printing Inspection Machine
Model: MT-LL-PM-C1-01X
Maximum Production Speed: 24,000 bags/hour
Inspection Scope: Inkjet printing and straw quality
Rejection Method: Precisely eliminates defective bags identified by the inspection module
Protection Rating: IP65
B. Primary Applications
The system is widely applied in paper-packaged beverage production lines, where it inspects inkjet codes and automatically rejects defective products to ensure quality consistency.
C. Key Advantages
Minimizes manpower needs and reduces overall production costs.
Enhances production efficiency while ensuring stable product quality.
Delivers inspection results that fully comply with the manufacturer’s technical standards.
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 (missing code, reversed package) | -- | >99.99% | |
1.2 | Missing inkjet printing Blurred inkjet printing | Overall code missing >50% | ≥99.99% | |
Overall code missing >30% | ≥99.96% | |||
1.3 | Incorrect inkjet printing | Code characters unreadable to the human eye | >99.93% | |
1.4 | Position offset | Incorrect production date, incorrect factory code, incorrect security code, deformation (elongation or shortening) | >99.99% | |
1.5 | Duplicate code | Exceeding the expansion zone | >99.99% | |
1.6 | Straw inspection | Multiple codes printed within the code area | >99.99% | |
2 | Inspection Items | No straw | >99.99% | <= 0.01% |
Note: The rejection rate for the "No Coding" test item in the table indicates that for every 10,000 uncoded packages tested by the equipment, one package might not be rejected. This is theoretical experimental data only, and the same applies to other test items. The above test items are tested in real time for each paper package, not just during shift changes to determine coding errors.
