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Exploring Common Issues in UV Inkjet Technology (Part 5)
Release time:
2025-07-05 16:58
UV inkjet printing technology, with its high precision, high efficiency, and environmentally friendly characteristics, has demonstrated broad application potential across numerous fields. However, during actual printing, issues such as ghosting and double‑line artifacts frequently arise, becoming key factors that compromise print quality and visual appeal. This paper delves into the underlying causes of ghosting and double‑line problems in UV inkjet technology and proposes corresponding solutions, aiming to provide valuable guidance for professionals in related industries.
I. Description of the Double-Image and Double-Line Issues
The ghosting and double‑line issue refers to the appearance of repetitive horizontal or vertical lines in UV inkjet printing, which degrades image sharpness and compromises visual quality. These artifacts may manifest as faint shadowing or as distinct double lines, significantly undermining the overall aesthetic appeal and professional appearance of the printed design.
II. Cause Analysis
1. Grating strip contamination: The grating strip is a critical component in UV inkjet printers, responsible for positioning and motion control. When the surface of the grating strip becomes contaminated with dust, ink, or other impurities, it can interfere with the reading of the grating signal, causing the printer to fail to accurately control the printhead’s movement and resulting in ghosting or double‑line artifacts.
2. Stepper Loss: In UV inkjet printers, the print head is typically driven by a stepper motor. When the motor loses steps due to excessive load, insufficient drive voltage, or mechanical malfunctions, the actual position of the print head deviates from the intended position, resulting in double‑exposure artifacts or twin lines in the printed image.
3. Platform Leveling Deviation: The levelness of the print platform is one of the key factors affecting print quality. When the platform becomes uneven, the distance between the nozzle and the build material varies, leading to uneven ink distribution on the surface and resulting in ghosting or double‑line artifacts.
III. Solution
1. Cleaning the grating strip: Regularly use a lint-free cloth lightly dampened with an appropriate amount of alcohol to gently wipe the surface of the grating strip, ensuring that no dust, ink, or other contaminants obstruct it. When cleaning, avoid using overly abrasive cloths or harsh chemical solvents to prevent damage to the grating strip’s surface.
2. Recalibrate motion parameters: Use the UV inkjet printer’s software interface to run the step‑error correction and bidirectional calibration procedures. These routines automatically detect and adjust the motor’s motion settings, ensuring precise positioning of the print head during operation. During calibration, follow the on-screen prompts step by step to prevent misoperations that could damage the equipment.
3. Adjust the print bed: Use a spirit level to check the bed’s levelness, and adjust the bed’s support feet or leveling screws accordingly to ensure the bed is perfectly horizontal with no offset. During adjustment, maintain the bed’s stability to prevent any wobbling or tilting during printing.
4. Strengthen equipment maintenance: Perform regular maintenance and servicing on UV inkjet printers, including cleaning the print heads, inspecting the electrical circuits, and replacing worn components. Proper equipment maintenance not only extends the machine’s service life but also enhances print quality and reduces the occurrence of defects such as double imaging and ghosting.
IV. Conclusion
Ghosting and double‑line artifacts in UV inkjet printing severely limit improvements in print quality and the visual impact of the output. However, by gaining a thorough understanding of their root causes—such as grating contamination, motor step loss, and platform misalignment—and implementing practical solutions—including cleaning the grating, recalibrating motion parameters, adjusting the print bed, and enhancing equipment maintenance—we can effectively address these issues. Moving forward, in our UV inkjet printing operations, we must remain vigilant about equipment condition, continuously refine our workflows, and ensure that every print meets the desired quality standards, thereby laying a solid foundation for the broader application of UV inkjet technology across diverse fields.
Disclaimer: The above content has been compiled from publicly available sources and is provided for reference only. If any infringement occurs, please contact us, and we will address it promptly.
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| B-271 | Aliphatic polyurethane acrylate | Flexibility, low shrinkage, weather resistance, pigment wettability |
| B-39 | Aliphatic polyurethane acrylate | Low viscosity, good flexibility, and low volatility. |
| B-570 | Polyester acrylate | Low viscosity, benzene-free, low odor, suitable for LED UV |
| B-572 | Polyester acrylate | Low viscosity, low odor, excellent wettability, suitable for LED UV. |
| B-574 | Polyester acrylate | Benzene-free, low-odor, and VOC levels meet cigarette-packaging standards. |
| B-574C | Polyester acrylate | Low viscosity, low odor, excellent wettability, suitable for LED UV. |
| B-609 | Aliphatic polyurethane acrylate | Fast curing, high hardness, scratch resistance, and chemical resistance. |
| B-619W | Aliphatic polyurethane acrylate | Fast curing, high hardness, excellent toughness, wear resistance, and chemical resistance. |
| BM1211 (HPMA) | Hydroxypropyl methacrylate | HEMA-free, high strength, low irritation, and high adhesion |
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| BM2224 (EO-HDDA) | Ethoxylation of 1,6-hexanediol diacrylate | It exhibits excellent adhesion to plastics, good dilutability, and low volatility. |
| BM3231 (TMPTA) | Trimethylolpropane triacrylate | High crosslink density, high hardness, high gloss, and excellent wear resistance. |
| BM3380 (3EO-TMPTA) | Pentaerythritol triacrylate | More flexible and less irritating than TMPTA. |
| BM3384 (3PO-GPTA) | Propylene glycol triacrylate | Good flexibility, low irritation, and excellent pigment wetting. |
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