Methods to Solve Unclear Printing by Inkjet Printers

22 Sep,2025

There are usually multiple reasons for unclear printing by inkjet printers. You can troubleshoot and solve the problem step-by-step as follows:

1. Check Ink and Solvent

Ink concentration: Too thin or too thick will affect results; adjust according to the manual's ratio.
Expired ink: Replace with new ink.
Solvent ratio: Ensure it matches the ink and avoid mixing different brands.

2. Nozzle and Print Head Maintenance

Nozzle blockage: Clean with special cleaning fluid or an ultrasonic cleaner.
Print head contamination: Gently wipe with a lint-free cloth dipped in cleaning fluid.
Print head height: Adjust to the appropriate distance (usually 2-5mm).

3. Adjust Printing Parameters

Printing speed: Too fast may cause broken characters; reduce appropriately.
Font size and resolution: Low resolution causes blurriness; increase as needed.
Voltage and waveform: Fine-tune the printing voltage according to the manual.

4. Surface of the Object Being Printed

Surface cleaning: Remove dust, oil, and moisture.
Surface treatment: For smooth or low surface energy materials (such as PE, PP), perform corona or flame treatment.

5. Environmental Factors

Temperature: Maintain within the equipment's operating range (usually 5-40℃).
Humidity: Too high causes ink spreading; too low easily generates static electricity.
Static interference: Install a grounding wire.

6. Mechanical Parts of the Equipment

Stable conveyor speed: Avoid vibration.
Proper synchronizer operation: Ensure printing is synchronized with object movement.

If none of the above methods work, the print head may be worn out or internal components may be damaged. In such cases, contact the manufacturer or professional maintenance personnel.

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