Doctor Blade Continuous Coating Machine for Battery Electrode Sheets

Product Overview

This doctor blade continuous coating machine is engineered for controlled, repeatable surface coating of web substrates. It combines comma-blade metering, precision mechanical adjustment, stable substrate handling, and integrated hot-air drying in one compact process platform. The result is a dependable route to accurate electrode film formation where coating thickness, dimensional control, and drying quality directly affect downstream cell performance.

The equipment is particularly suited to positive- and negative-electrode sheet development for lithium-ion batteries, supercapacitors, nickel batteries, and other secondary batteries. It supports coating processes based on ternary materials, lithium iron phosphate, lithium cobalt oxide, lithium manganate, graphite, silicon-carbon, and other electrode systems. Research institutes, battery development teams, and pilot production groups can use the unit to transfer formulations and coating conditions from laboratory work toward production-relevant process control.

Built around rigid steel-frame support, hardened working surfaces, automatic constant-tension handling, and independently controlled oven sections, this system is designed for demanding day-to-day operation. Precision roller and blade tolerances, monitored over-temperature protection, and robust stainless-steel oven construction provide confidence when processing sensitive slurry formulations and thin metal foils.

Key Features

• Precision Comma-Blade Metering: A double-sided comma blade works with a precision lead-screw adjustment mechanism to control the coating gap accurately. This arrangement supports a coating accuracy of ±3um and provides practical repeatability for electrode development and small-scale validation.

• Stable Web Tension and Guiding: Automatic constant-tension control stabilizes foil travel through unwinding, coating, drying, and rewinding. A web-guiding system helps maintain controlled tracking, reducing the risk of lateral movement that can compromise coated width and alignment.

• Dual-Sided Hot-Air Drying: The oven directs air to both the upper and lower sides of the moving substrate. This balanced airflow promotes high-quality drying across the coated surface while the shared upper and lower air chambers use a common heating element.

• Independent Dual-Layer Oven Architecture: The oven uses independently heated upper and lower layers arranged vertically. Each section is independently controlled, enabling defined thermal conditions and allowing process teams to manage drying behavior more consistently across the web.

• Accurate Analog Heating Control: Analog-signal power control and solid-state relay heating control provide precise, long-life thermal regulation. The hot-air circulation design delivers heating accuracy of ±0.5℃, while the maximum designed oven temperature is 150℃.

• Production-Relevant Coating Window: The equipment handles coating speeds from 0 to 0.5 m/min, slurry viscosities from 2000 to 12000 (mPas), solids content from 20 to 85%, and single-sided dry coating thicknesses from 20-200μm. This useful process range supports systematic formulation and parameter studies.

• High-Precision Roller Components: The comma blade and hard-chrome-plated steel coating roller are manufactured to circular runout ≤±1.5um, Ra0.4, and straightness ≤±1.5um. These tightly controlled hardware characteristics support even metering and a stable coating interface.

• Industrial Foil Handling: The unit is configured for aluminum foil from 8～30um and copper foil from 6～30um. A 3-inch pneumatic expanding shaft secures the feed roll, while the winding system uses automatic constant tension and a single-arm collection arrangement.

• PLC and Touchscreen Operation: PLC control with touchscreen operation gives operators a direct, accessible interface for routine process management. The control approach is suitable for development environments where repeatable setup and clear operational handling are essential.

• Optional Solvent Recovery: A solvent recovery system can be specified for processes using oil-based NMP or water-based H2O/NMP solvent systems. This option allows the coating line to be configured in line with site-specific solvent-handling requirements.

Applications

Technical Specifications

Why Choose This Product

• Precision Built Into Critical Components: Tight circular-runout, straightness, and surface-roughness requirements for the blade and coating roller provide a robust mechanical basis for uniform metering and repeatable coating work.

• Controlled From Roll to Roll: Constant-tension handling, web guiding, dimensional control, and front-to-back alignment specifications help maintain sheet consistency through the complete coating and rewinding path.

• Designed for Reliable Thermal Processing: SUS304 stainless-steel oven components, independent section control, analog heating regulation, and over-temperature power cut-off protection support dependable operation under sustained drying loads.

• Configured for Real Electrode Development: The supported foil, slurry viscosity, solids-content, solvent, speed, and dry-thickness ranges make this system commercially relevant for battery R&D and small-scale process validation.

• Adaptable to Site Requirements: Optional solvent recovery and a defined electrical and compressed-air interface allow the equipment to be specified around facility conditions and process needs.

Contact us for a quote or a custom solution configured for your electrode coating workflow.

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