Application of Kyocera White Line Compensation Technology in Micolorprint Printers:A Print Quality Recovery Solution for Inkjet Printing

I. Technical Background: Causes and Impact of White Line Defects

“White lines” are common quality defects in inkjet printing, mainly arising from two scenarios:

1. Hardware-related issues: When printhead nozzles become clogged, misaligned, or weakened, ink ejection is interrupted, resulting in linear blank gaps.
2. Mechanical feeding deviations: When paper exits the feed roller due to overfeeding, blank gaps may appear in the printed area.

Such issues directly affect print consistency, especially in high-precision applications such as coated paper printing, potentially increasing printhead cleaning frequency and consumable waste.

II. Core Technical Solution: Dual Strategy of Hardware Optimization and Intelligent Compensation

Kyocera addresses white line issues through a dual-layer strategy of “Prevention + Correction.” The key technical approaches include:

(1) Hardware Foundation: Enhanced Stability of Printhead and Ink Supply System

1. High-Precision Printhead Design

Kyocera’s 80K series printheads reduce color deviation and white line formation at the source by improving jetting accuracy. The piezoelectric ejection structure precisely controls droplet placement. When combined with technologies such as Founder’s “Hybrid Dot” screening, it reduces blank gaps in halftone areas.

2. Ink Supply System Integration

When paired with the sixth-generation circulating ink supply system, continuous ink circulation reduces nozzle clogging probability, minimizing the root causes of white line formation at the hardware level.

(2) Intelligent Compensation: Dynamic Control and Defect Repair Algorithms

1. Mechanical Feed Speed Adjustment (Patent CN1496849A)

To address white lines caused by paper feeding deviations, the system compensates through three modules:

• Position Detection: A file position sensor detects when paper reaches the reference position.
• Data Prediction: The memory unit stores white line-prone positions for different paper sizes.
• Dynamic Speed Regulation: When a white line is about to occur, the system temporarily reduces feed roller speed or pauses briefly to correct overfeeding.

For example, during A4 printing, the system predicts when the trailing edge leaves the roller and decelerates in advance to prevent blank gaps.

2. Ink Coalescence Compensation for Defective Nozzles (Patent CN111196088B)

For white lines caused by nozzle defects, Kyocera adopts a strategy of “Adjacent Nozzle Collaboration + Defective Nozzle Utilization.”

• Do not fully disable weakened nozzles: Slightly misaligned or weakened nozzles are controlled to continue ejecting small amounts of ink.
• Droplet Volume Adjustment: Adjacent nozzles increase droplet volume, while the next adjacent nozzle reduces droplet size. The ink coalescence effect forms an “ink bridge” to fill the blank gap.
• Dynamic Adaptation: Compensation frequency is adjusted based on ink type and substrate (e.g., compensating 1 dot per 10 pixels), preventing overcompensation that may result in dark lines.

(3) System-Level Closed Loop: Integrated Software and Hardware Quality Control

Kyocera achieves full-process optimization through the combination of printhead + ink + inspection system:

• By using a matched solution such as Jetcolor ink + Kyocera printhead, ink adhesion and spread performance on coated paper and other media are enhanced.
• Integrated online inspection systems detect white lines in real time and trigger automatic compensation, reducing printhead cleaning frequency to 2–3 times per shift in coated paper applications.

III. Application Practice and Technical Advantages

1. Core Application Scenarios

This technology is primarily applied in digital printing, particularly in mixed production environments using coated paper and offset paper. Equipment manufacturers such as Founder have integrated Kyocera technology to achieve a balance between high resolution and low material loss, suitable for book publishing, commercial posters, and other high-precision printing applications.

2. Key Advantages Comparison

IV. Technical Limitations

The current technology still has certain limitations. For example:

• Completely failed nozzles cannot be compensated through ink coalescence.
• Ink types must be compatible with coalescence characteristics for optimal performance.