This production line is specifically designed for the continuous slot-die coating of CCM anode catalyst layers for proton exchange membrane fuel cells (PEMFCs). It integrates the entire automated process, from substrate unwinding to finished-product rewinding.
Engineered with a strong focus on coating uniformity, process repeatability, and production stability, the line features a modular architecture and intelligent control system to support high-consistency, high-yield, and scalable catalyst-layer manufacturing.
It is well suited for membrane electrode assembly (MEA) manufacturers, research institutes, and pilot-scale production platforms, enabling efficient mass production while supporting continuous process development and optimization.
PRODUCT DESCRIPTION
1. Precision Coating Control
Equipped with a high-precision slot-die head featuring ±0.001 mm flatness and lip straightness, combined with a servo-driven lifting mechanism for 1 μm-level GAP adjustment. This ensures excellent catalyst-layer thickness uniformity and stable areal density across the coating width.
2. Closed-Loop Tension & Web Guiding Control
Servo-driven closed-loop constant-tension control is applied throughout the unwinding, coating, and rewinding processes. A high-precision EPC edge-position control system minimizes film stretching, wrinkling, edge wandering, and web misalignment, ensuring stable and accurate material transport.
3. Intelligent Slurry Feeding System
The slurry supply unit integrates pressure stabilization, constant-flow delivery, filtration, degassing, and circulation mixing. By minimizing pressure fluctuations and air bubbles within the delivery system, it helps prevent coating defects such as interruptions, streaks, and uneven coating.
4. In-Line Inspection & Traceability
The line can be integrated with X-ray areal-density measurement, machine-vision surface inspection for defects such as pinholes, missing coating, and scratches, as well as web-guiding monitoring. Critical process data is recorded in real time, with MES/OPC connectivity available for full-process traceability.
5. Recipe & User Access Management
The PLC + HMI control system supports rapid recipe changeover, multi-level user access control, alarm history, and process trend analysis. It enables flexible adaptation to different slurry formulations and product specifications.
| Item | Technical Specification | Remarks |
| Application | Continuous coating of CCM anode catalyst layers | Membrane substrate and catalyst system to be confirmed by customer |
| Effective Coating Width | 50–600 mm | Customizable upon request |
| Coating Speed | 1.5–3.0 m/min | Coordinated with wet-film thickness and drying capacity |
| Registration Accuracy | ≤ 0.5 mm | Referenced to substrate edge or registration mark |
| Coating Method | Slot-die coating | Single-side continuous coating; alternative coating methods optional |
| Die Flatness | ±0.001 mm | — |
| Die Lip Straightness | ±0.001 mm | — |
| GAP Adjustment Accuracy | 1 μm | Servo-controlled adjustment |
| Tension Control Accuracy | 3 N, adjustable | Final configuration based on substrate specifications |
| Control System | PLC + HMI | Supports recipes, alarms, trend monitoring, data export, and reserved MES/OPC interfaces |
1. Unwinding Unit
Features servo-driven closed-loop constant-tension control, EPC web guiding, web-break detection, and material buffering to provide stable and accurately aligned substrate feeding.
2. Slurry Feeding Unit
Provides pressure-stabilized, constant-flow slurry delivery with integrated filtration, circulation mixing, degassing, and return-line bubble removal, ensuring stable and consistent slurry supply.
3. Slot-Die Coating Unit
Uses a precision slot-die head for uniform slurry distribution, combined with a vacuum adsorption roller for stable substrate positioning and servo-controlled GAP adjustment. The system helps minimize defects such as edge wandering, blistering, and orange-peel surface texture.
4. Drying & Cooling Unit
Features multi-zone hot-air drying and controlled cooling matched to the coating speed, ensuring sufficient coating drying and stabilization while minimizing adhesion, cracking, and other defects.
5. In-Line Inspection Unit
Integrates machine-vision surface inspection for pinholes, missing coating, streaks, and scratches, together with X-ray areal-density measurement and web-guiding feedback, enabling real-time quality and process monitoring.
6. Rewinding Unit
Uses closed-loop constant-tension rewinding, EPC web guiding, and pneumatic expanding shafts to ensure uniform roll formation, neat roll edges, and minimal risk of coating damage.
7. Electrical & Digital Control System
Built around an industrial PLC + HMI platform, providing recipe management, multi-level access control, alarm history, process trend visualization, and batch data export. Communication with host computers and MES systems is also supported.
1. Coating width, line speed, tension range, and other key parameters can be customized according to the customer’s product specifications and process requirements.
2. Supports pneumatic expanding shafts or mechanical shafts, as well as different roll diameters and widths, to accommodate a wide range of incoming materials.
3. The system is designed with reserved expansion and communication interfaces, enabling convenient integration into smart manufacturing and factory digitalization systems.
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