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Spray code features:

Contains important product information, production time, origin, tank number, etc;
Serious defects can give rise to customer complaints:
Spray code type: ink spray code, laser code, thermal transfer code;

Current status of testing:

Manual detection has problems such as blind area, fatigue and inability to adapt to height;
It is impossible to effectively detect each code-spraying content in online production, only random inspection or inspection.

Detection difficulties:

The background of the spray code is complicated and there are many kinds of patterns;
Spray code defect location random, high precision requirements;
Ink spray code is affected by the external environment, flower code, ink line bias, ink accumulation has a greater impact.
It is seriously affected by the product in the production line, milk stains and water drops;
The line speed is high, which needs to meet the real-time high-speed detection;

1, different brands of inkjet printer, font there are differences.
2. The change in the height of the inkjet printer nozzle from the product surface will cause the character size to change.
3. The influence of the levelness and verticality of the nozzle installation on the printed characters.
4. The influence of production line speed changes on the length and characters of inkjet printing information.


Schematic diagram of inkjet printing effect under different conditions

Suggestion: According to the printing characteristics of ink inkjet printer, it is necessary to make standard management and clear standards for on-site inkjet before supporting visual inspection. Visual inspection can be modeled and tested according to the requirements of on-site operation specifications, improving the quality of product printing from the source, improving various inspection indexes of visual inspection and reducing the rejection rate.

　

Classification Test Items Accuracy detection rate
A Single character printing error Character error 100%
B Single character print missing Missing 100% 100%
Missing 50% 99%
C Overall character defect No spray code 100%
Overall missing 30% 99.9%
Excessive position offset 99.9%
Ｄ Comparison and detection with system information Inconsistent with system information 100%