1200DPI Book And Magazine Inkjet Advanced Guide② | How Does The Hongbo Kirin 660CHD Keep High-Definition CMYK Double-Sided Printing Stable?

Kirin 660CHDEnsure precise, stable four-color registration

Easily handle all kinds of color printing orders

In the book and publication printing industry, broken text lines and inaccurate four-color registration are key rejection points in quality checks by high-end publishers, and they are common pain points in most rotary inkjet book printing. Especially for black-blue or black-red two-color printing orders, as well as printing scenarios with a lot of overlapping text, misregistration and missing lines occur frequently. For publishers with strict quality requirements, once such defects occur, the orders are directly judged as substandard or unqualified.

The Hongbo Kirin 660CHD addresses these industry pain points, offering an advanced inkjet printing solution for books and publications that meets expectations.

Wider Color Gamut and Smaller Ink Droplets

Restoring True Colors, Beyond Expectations

The Kirin 660CHD uses a 1200DPI industrial-grade piezo ceramic cycle printhead. With our in-house core printhead drive technology and years of mature application experience, it delivers more precise and stable ink performance. The printhead has 5,116 tightly arranged nozzles, ensuring wide coverage and even printing; smaller ink droplets allow for 2-level grayscale 24pl printing. This means the device can accurately reproduce designs, whether it's subtle gradients, sharp contrasts, or tiny text and line details, meeting the high-quality demands of publishers.

The printhead also comes with a full-board water cooling system to maintain optimal working temperature; it has nozzle compensation, so if a nozzle fails, software compensation can fix any white line issues; nozzle-level ink circulation prevents clogs and local overheating, ensuring consistent performance when printing at high speed on book rolls.

Solid equipment with strict control of processing precision

Comprehensive assurance of registration accuracy and durability

The Hongbo R&D team believes that the main causes of four-color registration deviations and color misalignment mostly come down to four key weaknesses: unstable mechanical structure, insufficient machining precision, inadequate control of motion tension accuracy, and lack of signal control logic for the raster board. In response, Hongbo Intelligent insists on using high-spec hardware configurations and strictly controls every step of processing and assembly, providing customers with more solid and reliable machinery.

The Kirin 660CHD machine has a paper guide roller with a runout of ≤0.015mm, and after assembly, the runout is ≤0.02mm. Thanks to rigorous mechanical structure design and precision control, registration deviations or color inconsistencies caused by unstable mechanical structures, insufficient machining accuracy, or poor motion tension control during high-speed paper movement are eliminated at the source.

"All Hongbo Kirin series book printing machines use a frame-type reinforced rack, which is highly recognized by our customers as a solid frame. The frame beams are arranged reasonably, so precision won't drop even under long-term heavy loads. For automation control, we use PLCs, which are more expensive but much more stable. Almost all motors, drives, and PLC controllers are from well-known international brands. The whole machine is built with solid, reliable materials, and from both structural design and hardware selection, we ensure registration accuracy and long-term stability."

Independent and Flexible Color-Module Print Bar Design

The perfect mix of precise alignment and flexible efficiency

The Kirin 660CHD uses an independent color-module print bar design. Unlike traditional setups where all the nozzles are fixed on the same beam, each color has its own module. It's like a buffet: you use whatever color you need. Combined with Hongbo's mature Single Pass technology and precise mechanical control system, it ensures higher four-color alignment accuracy, flexibility, and efficiency.

"If you're printing single-color documents, the color nozzle modules can just stay idle and automatically go into a moisture-preserving mode. This prevents them from drying out or clogging, and it doesn't affect the black nozzle module working at full speed. When you need to print two-color or multi-color orders, the nozzles can switch freely. Compared to shared print bar setups, this independent design makes maintenance much easier; you can clean or replace a color nozzle without stopping the machine. This makes handling different orders much more flexible."

Kirin 660CHD

Heavy Ink Offset Printing Without Wrinkles

Three-Stage Drying System Works Seamlessly

"Even in high-ink modes, the Kirin 660CHD can print offset paper in batches without any wrinkling from ink saturation. This is mainly thanks to Hongbo's innovative three-stage efficient drying system." First, the freshly printed paper goes through an instant drying system, which effectively reduces ink spread and improves color vibrancy. Then, the paper passes through a drum drying system with a semi-enclosed drum design, which not only lengthens the drying path for more uniform and thorough heating, but also dries the ink layer fully to prevent wrinkles caused by uneven heat. Finally, the paper goes through a hot air drying system that removes surface moisture, keeping the paper dry and flat while preventing sticking when stacked.

Additionally, Hongbo has optimized a special ink formula for the characteristics of offset paper. It dries quickly while minimizing moisture penetration, so even with heavy ink coverage, the ink is absorbed quickly, reducing buildup. Their self-developed high-concentration, low-moisture pigment inks have richer color saturation, achieving the same color effect with less ink.