Amid the rapid evolution of technologies in precise detection, intelligent monitoring, and personalized medicine, chemical sensors—core devices for obtaining information on material composition and concentration—are advancing toward miniaturization, flexibility, array integration, and low-cost manufacturing. Leveraging its unique advantages of non-contact precision deposition, digital pattern control, and high material utilization, inkjet printing technology has overcome the limitations of traditional sensor fabrication methods that rely on masks, complex processes, and high costs. It has thus emerged as an innovative technological pathway for constructing high-performance chemical sensors. From flexible wearable biomarker detection to industrial environmental pollutant monitoring, inkjet-printed chemical sensors are demonstrating tremendous research value and application potential. I. Core Adaptation Logic Between Inkjet Printing Technology and Chemical Sensors The performance of chemical sensors fundamentally depends on the selectivity, response speed, and stability of sensitive materials, while device miniaturization and integration directly determine the expansion of application scenarios. Through precise regulation and deposition of functional inks, inkjet printing technology enables a high degree of matching among “material–structure–performance” in sensor design. Its adaptability is mainly reflected in three aspects: (1) Precise Loading and Structural Regulation of Sensitive Materials Inkjet printing enables precise deposition of inks containing nanoscale sensitive materials (such as MXene, polyaniline, and molecularly imprinted polymers) in droplets ranging from picoliters to nanoliters, with droplet volume deviation less than 5%. This allows quantitative control over the thickness (100 nm–10 μm) and microstructure of the sensitive layer. For example, in humidity sensor fabrication, by controlling the number of printed layers of MXene/sodium alginate composite

I. Comparison of Ricoh G5 and G6 Printhead Parameters   Ricoh Gen 5 and Gen 6: Parameter Comparison General Properties GEN 6 GEN 5 Print Width 54.1 mm (2.1″) 54.1 mm (2.1″) Number of Nozzles 1,280 (4 × 320 channels) 1,280 (4 × 320 channels) DPI 600 600 Compatible Ink UV, Solvent, Aqueous UV, Solvent Max. Number of Colors 4 4 Max. Jetting Frequency 50 kHz 30 kHz Drop Volume 5–15 pL 7–21 pL Viscosity Range 10–12 mPa·s 10–12 mPa·s Cable Type Detachable cable Integrated cable 1. Printhead Structure There are structural differences between the Ricoh Gen 5 and Gen 6 printheads. The G5 adopts an integrated structure in which the printhead and data cable are connected together and cannot be separated. The G6 adopts a modular structure in which the printhead and data cable can be separated. Generally speaking, the maintenance cost of the G6 is significantly lower. 2. Printing Resolution The printing resolution of the Ricoh Gen 6 is higher than that of the Gen 5. The G6 features smaller droplet sizes, enabling higher resolution and finer patterns, making it suitable for more demanding printing applications. 3. Inkjet Control The G6 achieves more precise droplet control, upgrading from 7 pL to 5 pL. This allows better control over droplet landing position and diameter, resulting in more accurate printing results. 4. Printing Speed The G6 offers higher printing speed. The firing frequency has increased from 30 kHz to 50 kHz, enabling faster printing speeds. This is highly beneficial for

Technical Characteristics of Pigment Inks   Technical Characteristics and Challenges of Pigment Inks 1. Performance Comparison Between Pigments and Dyes Lightfastness and Water Resistance: Pigments (such as TiO₂ and carbon black) form a dense film by bonding with resins on the particle surface, resulting in significantly better lightfastness (Blue Wool rating 4–6) and water resistance compared to dyes (such as Cyanine 3). However, pigment particles (typically 50–200 nm) have relatively low chemical activity, leading to 10%–20% lower color saturation (ΔE) compared to dyes. Particle Size and Nozzle Compatibility: Pigment particles must be significantly smaller than the nozzle orifice diameter (e.g., 20–50 μm for piezo printheads). However, nanoscale particles (e.g., TiO₂ at 20 nm) are prone to agglomeration due to van der Waals forces, requiring dispersants (such as polyacrylates) to maintain stability. 2. Key Issues in Inkjet Applications Dispersion Stability: Pigments must undergo high-shear dispersion (e.g., via ball milling) to reduce oil absorption (e.g., TiO₂ oil absorption ≤ 20 g/100 g). Dispersants (such as BYK-110) are added to prevent sedimentation. Drop Formation and Nozzle Maintenance: High-viscosity pigment inks (e.g., 100–200 mPa·s) require optimized surface tension (e.g., adding 0.1% silicone additives) to improve drop break-off performance. However, long-term use still tends to cause nozzle clogging, with a failure rate approximately 30% higher than that of dye-based inks. Drying Speed and Film Strength: Pigment inks rely on resin crosslinking (such as polyurethane acrylates) for curing. Their drying speed is slower than that of dyes (e.g., UV curing requires 1–2 seconds), but after film

Against the backdrop of rapid iteration in new energy technologies, thin-film lithium-ion batteries have been widely applied in flexible electronics, wearable devices, micro-sensors, and other fields due to their advantages of small size, light weight, high energy density, and long cycle life. Innovation in fabrication processes is the key to achieving performance breakthroughs and cost reduction for thin-film lithium-ion batteries. As a non-contact, digital precision manufacturing technology, inkjet printing—by virtue of its unique advantages—is gradually becoming a research hotspot in the field of thin-film lithium-ion battery fabrication. I. Compatibility Between Inkjet Printing Technology and Thin-Film Lithium-Ion Batteries The core structure of thin-film lithium-ion batteries includes the cathode, anode, electrolyte, and current collector. The thickness of each layer typically ranges from nanometers to micrometers, and extremely high requirements are placed on structural uniformity and interfacial compatibility. Inkjet printing technology precisely deposits functional inks onto substrate surfaces in the form of micro-droplets, forming the required functional layers through post-processing steps such as drying and sintering. Its compatibility is mainly reflected in the following three aspects: 1. High Precision and Controllability The droplet volume in inkjet printing can be precisely controlled at the picoliter to nanoliter level, enabling fine fabrication of electrode patterns with minimum line widths below 10 micrometers. This meets the design requirements for miniaturization and integration of thin-film lithium-ion batteries, especially for the fabrication of micro-battery arrays connected in series/parallel. 2. High Material Utilization Traditional fabrication processes (such as blade coating and vapor deposition) suffer from severe material waste. In

I. Environmental Preconditioning: Winter Temperature, Humidity, and Ink Condition Control 1. Closed-Loop Temperature Management   ◦ The working environment temperature must be stabilized at 15–25°C (activate the printhead heating function if below 15°C), and temperature fluctuations must not exceed ±5°C (every 5°C fluctuation can cause a 20 μm positional deviation of the printhead, intensifying waveform distortion). ◦ Ink must be preheated in the working environment at least 2 hours in advance to prevent viscosity surge caused by low temperatures (original factory reference viscosity: 3.5 cP; when winter temperatures drop below 10°C, viscosity may rise above 8 cP). ◦ Enable the equipment’s built-in dual heating system (printhead heating + ink path insulation) to maintain the printhead surface temperature at 28–30°C, ensuring proper ink fluidity. 2. Humidity and Electrostatic Protection   ◦ Control ambient humidity within 40–60%. In dry winter conditions, use a humidifier to prevent ink from drying too quickly and clogging nozzles, while also reducing electrostatic interference with droplet trajectory. ◦ Ensure equipment grounding resistance ≤4Ω. Printing media should be de-staticized in advance (e.g., using an anti-static bar) to prevent electrostatic discharge from damaging piezo elements or causing droplet scattering. II. Core Parameter Adjustment: Winter-Specific Limits and Compensation Logic (1) Adjustment Principles Only adjust the two core parameters: Main Pulse Voltage and Pulse Width. Keep damping negative voltage at -15V or slightly adjust to -12V (to prevent insufficient negative pressure leading to droplet tailing). Single adjustment amplitude: voltage ≤±5V, pulse width ≤±10%. For pigment inks, reserve an additional +1V safety

Technical Analysis of Solvent-Based Inks 1. Substrate Compatibility and Printing Technology Application on Non-Porous Substrates: Specifically designed for non-absorbent materials such as vinyl sheets, plastics, metals, and glass. High-precision printing is achieved through piezoelectric technology (e.g., EPSON PrecisionCore) or continuous inkjet systems (e.g., HP Thermal Inkjet), with droplet volumes controllable within 1–3 pl. Adhesion Optimization: Modified chlorinated polypropylene resins (peel strength ≥4.5N/15mm) or plasma pre-treatment technologies (surface tension increased to 50 dyn/cm) are used to ensure strong adhesion on low-surface-energy substrates. 2. Solvent Systems and Environmental Challenges Traditional Solvents: MEK (Methyl Ethyl Ketone), alcohols (such as isopropanol), and ethylene glycol lactate require extraction systems (VOCs removal rate ≥90%). However, they present flammability risks (flash point <23°C) and transportation/storage hazards. Eco-Solvents: Low-odor alternatives (e.g., ethyl lactate, odor threshold >1000 ppm) help reduce workplace exposure risks, but require balancing drying speed (typically extended by 20–30%) and nozzle lifespan. 3. Drying and Odor Control Drying Speed Balance: By adjusting the solvent evaporation gradient (e.g., combining fast-drying and slow-drying solvents), a balance can be achieved between surface drying (5–10 seconds) and complete curing (30–60 minutes), preventing “false drying” or “skin formation.” Odor Residue Control: Molecular sieve adsorption (VOCs residue <0.1 ppm) or high-temperature degassing processes (80°C for 30 minutes) can reduce residual odor, although complete elimination of image odor may still require several hours. 4. Safety and Regulatory Compliance Transportation and Storage: Must comply with UN 1263 hazardous material transport standards. Storage requires explosion-proof cabinets (e.g., FM-certified) and inert gas protection (nitrogen concentration >95%).

Impact on UV Ink Printing Performance Color Bleeding Multidimensional Factors Affecting UV Ink Printing Performance I. Material System: The Determining Role of Ink Formulation 1. Photoinitiator Compatibility A 395nm wavelength requires TPO/ITX-type photoinitiators, while the 365nm band is best matched with 819-type initiators. Insufficient photoinitiator content (<3%) leads to incomplete curing, whereas excessive content (>10%) results in brittleness of the ink layer. UV Ink Dot Quality 2. Resin–Monomer Synergistic Effect Epoxy acrylate provides hardness (suitable for metal/glass substrates), while polyurethane acrylate offers flexibility (for PET/PP substrates). The ratio of TPGDA to HDDA monomers affects viscosity (optimal range: 12–18 cP) and adhesion (must reach 3.8 × 10⁻² N/m). Dot Gain II. Equipment Parameters: Dynamic Balance Between Precision and Energy 1. Printhead Technical Specifications A minimum droplet size of 3 pL combined with 1200 dpi resolution can achieve 5 μm line accuracy. Printhead height deviation >0.2 mm causes droplet trajectory offset (ideal value: 1.5 ± 0.1 mm). 2. Curing System Configuration Multi-band LED combinations (395nm + 365nm) improve curing efficiency by 40% compared to single-band systems. Energy density must be ≥800 mJ/cm². If power is insufficient, printing speed should be reduced to <30 m/min. UV Curing Image Formation Process III. Process Control: Precise Management of Environment and Operation 1. Substrate Compatibility Material Type Pre-treatment Requirement Typical Problem-Solving Method Non-absorbent substrates Plasma treatment (>50 dyne/cm) Add 3% adhesion promoter Porous materials Dedicated primer (pore filling rate >90%) Pre-coat with UV primer (film thickness 5–8 μm) 2. Environmental Stability Control Temperature fluctuations >±3°C cause

1) Dedicated Ink Supply System Maintenance: Adapting to Single-Path Ink Pressure and Cleanliness Control The KM800/1600 features a “single-path ink supply + passive ink return” simplified ink supply design (no active circulation pump). Ink delivery relies on gravity and ink pump negative pressure, requiring precise control over pressure stability and channel cleanliness to avoid consistency deviations during wide-format printing: 1. Precision Ink Supply Pressure Control Basic Pressure Setting Boundaries: Ink supply pressure should be stable at 0.015-0.025MPa, lower than the circulating system pressure of the KM1024a. Since the single-path ink supply lacks return pressure buffering, pressure exceeding 0.03MPa may cause ink chamber overpressure (with the aluminum alloy chamber tolerance limit at 0.04MPa), leading to ink leakage from nozzles. Pressure below 0.01MPa causes inkjet power loss, leading to missing lines. It is recommended to use a manual pressure control valve with a digital pressure gauge and record the pressure every 30 minutes. If fluctuations exceed ±0.005MPa, immediate calibration is required. Liquid Level and Pressure Linked Control: The ink bottle’s liquid level should remain within ±5cm of the printhead’s height. For every 10cm drop in liquid level, pressure should be adjusted up by 0.002MPa. Low liquid levels will cause ink supply flow rate to decrease (<0.5mL/min), leading to over 10% nozzle ink drop insufficiently. Do not refill ink when the ink bottle is nearly empty; always reserve 10% ink to prevent air from entering the system during refilling. 2. Multi-Level Cleanliness Protection for Ink Channels Filter System Configuration: Only a 1μm precision

I. Basic Parameter Comparison Dimension Toshiba CF3R Toshiba CF6R Core Positioning High-precision industrial basic model High-performance upgraded model (CF3R replacement) Cooling Method Water-cooled (with water cooling port) Water-cooled (similar to CF3R, slightly thicker) Size and Weight 96.7×31.3×100.7mm, 285g 96.7×31.3×100.7mm, 285g Nozzle Configuration 1278 nozzles (two rows), 600npi 1278 nozzles (two rows), 600npi Droplet Size 3-20pL (6 grayscale levels) 6-18pL (4 grayscale levels, 3-drop combination) Ejection Frequency Max 9.2kHz (5-drop mode) 12kHz (3-drop mode) Print Speed Baseline speed 1.5x faster than CF3R Ink Compatibility UV curing, oil-based, high-viscosity ink UV curing, oil-based ink Core Technology Fine-tuning single nozzle adjustment, full-channel circulation Full-channel circulation, precise droplet control II. Core Differences Analysis Core Performance: Speed and Droplet Control Generation Upgrade CF6R is an upgraded product of CF3R, with a 50% improvement in printing efficiency. This is achieved by increasing the ejection frequency from 9.2kHz to 12kHz, paired with a 1.5x faster driving algorithm, significantly improving the output capacity of a single printhead. Droplet Control Logic: CF3R supports a wide range adjustment of 3-20pL (6 grayscale levels), suitable for fine artistic printing; CF6R uses a 6pL native droplet with 3-drop combination technology (6/12/18pL), which, while reducing the grayscale levels, achieves faster speeds with high-frequency ejection, balancing both precision and efficiency. Structural Design: Compatibility and Cooling Balance Both have identical size, electronic interfaces, and pipeline layouts. The CF6R can directly replace CF3R without altering the printer structure. Cooling design is water-cooled, but CF6R has stronger heat dissipation compatibility due to high-frequency operation. It features built-in

Factors Controlling Print Quality in Digital Inkjet Printing   I. Decisive Role of the Printhead and Printer System 1. Printhead Performance Parameters Droplet Accuracy: Piezoelectric printheads can achieve dynamic droplet switching in the range of 3.5–12 pL. When droplet volume deviation is controlled within ±0.4 pL, dot placement error can be kept within ≤ 2 μm at a resolution of 9600 dpi. Jetting Stability: The number of nozzles and their arrangement density directly affect image uniformity. For example, the Epson i3200 printhead is equipped with 1600 nozzles per color, which can reduce printing banding by approximately 30%. Motion Control: High-precision linear guide rails (positioning accuracy ±5 μm) combined with a closed-loop servo system ensure registration errors of < 0.02 mm during multi-pass printing. 2. Mechanical Compensation Technology Through multiple-pass printing coverage (4–8 passes), defects from a single jetting pass can be compensated: Missing droplet areas are compensated by cross-coverage from adjacent nozzles Color density fluctuation is reduced from ±0.15 to ±0.05 OD II. Key Influence of Ink Properties   Parameter Quality Correlation Optimization Method Viscosity Affects droplet formation (ideal range: 8–12 cP) Add nano-silica to improve rheological behavior Drying Speed Determines dot gain Control UV ink curing time within 0.3–0.5 s Color Density Related to color gamut coverage Pigment-based inks can increase CMYK gamut by 18% III. Substrate Adaptation and Regulation 1. Surface Energy Matching For coated paper, surface tension should be adjusted to 32–38 mN/m, allowing a 3.5 pL droplet to maintain a stable contact angle of 55° ±