High-Precision Intermittent Scraper Coating Line for Lithium-Ion Battery – Customizable Scraping Zone Accuracy & Multi-Zone Drying
This customizable knife coating production line is a continuous or intermittent coating system that uses a precisely controlled doctor blade to apply uniform layers of liquid coatings onto flexible or rigid substrates. Available in roll-to-roll continuous production, laboratory R&D, and high-precision intermittent configurations.
The system is fully customizable in coating width, drying length, coating method (comma blade / doctor blade / rod coating), and automation level. The coating thickness is controlled by the precise gap between the blade and the substrate or backing roll, enabling wet film thicknesses from 5 µm to several hundred microns with exceptional uniformity (up to ±1-2 µm accuracy).
Working principle: The coating material is supplied to the substrate surface, and the doctor blade (comma blade or scraper) meters the excess coating to leave a precisely controlled wet film thickness. The coated substrate then passes through drying ovens where solvents are evaporated or resins are cured. This method is widely used in lithium-ion battery electrode manufacturing, adhesive tape production, and functional film coating.
Technical Parameters
| Parameter |
Roll-to-Roll Production Model |
Laboratory R&D Model |
High-Precision Intermittent Model |
| Substrate width (customizable) |
200 - 1600 mm |
Up to 300 mm |
80 - 250 mm |
| Coating width (customizable) |
150 - 1600 mm |
Up to 200 mm |
50 - 220 mm |
| Substrate types |
PET, PI, paper, non-woven, Al/Cu foil, steel pipe |
Glass plates, PET film, wafer, membrane |
Al/Cu foil for Li-ion battery |
| Coating method (customizable) |
Comma blade / Slot die / Multi-roll |
Doctor blade / Wire-wound rod |
Intermittent scraper / Transfer coating |
| Wet coating thickness range |
10 - 500 µm |
5 - 100 µm |
10 - 300 µm |
| Coating uniformity |
±2% |
±0.5 - 1% |
±1.5% (刮区精度 ±0.5mm) |
| Mechanical speed (customizable) |
0.5 - 80 m/min |
0.01 - 0.5 m/min |
0.1 - 1.0 m/min |
| Drying temperature (customizable) |
Up to 200°C |
Up to 160°C |
Up to 150°C |
| Drying method (customizable) |
Hot air / IR / UV / Gas heating |
Hot air / IR heating |
Hot air / IR heating (NMP recovery optional) |
| Oven sections (customizable) |
2 - 6 sections |
1 section |
1 - 3 sections |
| Tension control |
Closed-loop load cells |
Manual / Open-loop |
Closed-loop |
| Control system |
PLC + HMI touchscreen |
Digital controller / PLC |
PLC + HMI |
| Power supply |
380V, 50/60Hz, 3-phase |
110/220V, 50/60Hz |
220V, 50Hz |
| Typical application |
PSA tape, battery anode/cathode, optical film |
R&D sample making, sol-gel coating |
Li-ion battery electrode intermittent coating |
Applications
- Battery industry: Lithium-ion battery electrode (anode/cathode) continuous and intermittent coating
- Adhesive tape: Double-sided tape, single-sided tape, PSA (pressure-sensitive adhesive), hot-melt adhesive
- Optical films: Anti-glare film, diffusion film, hard coating, functional films
- Packaging materials: Barrier coatings, heat-seal coatings, cold-seal adhesives
- Textile & non-woven: Fabric coating, non-woven fabric treatment
- Printing & coating proofing: Laboratory sample making, R&D testing
- Solar energy: Perovskite solar cell coating
- Electronics: OLED, flexible printed circuits, conductive coatings
Customization Options
This knife coating production line is highly customizable to meet your specific production requirements:
- Coating width: Customizable from 150mm to 2000mm
- Coating method: Comma blade / Doctor blade / Slot die / Micro-gravure / Multi-roll transfer
- Coating type: Continuous coating / Intermittent coating / Stripe coating / Pattern coating
- Drying system: Hot air / IR drying / UV curing / Gas heating - single or multi-zone, customizable oven length
- Drying temperature: Customizable range from ambient to 200°C+
- Substrate types: Flexible films, foils, paper, non-woven, steel pipes - customizable material compatibility
- Tension control: Manual / Open-loop / Closed-loop with load cells
- Unwinding/rewinding: Single-station / Dual-station - customizable max roll diameter up to 1000mm
- Blade type: Comma doctor blade (steel/chrome-plated) / Polymer scraper / Wire-wound rod
- Blade gap adjustment: Manual micrometer / Servo motor automatic adjustment
- Slurry supply: Manual injection / Automatic circulation pump / Precision syringe pump
- Vacuum substrate table: For rigid substrate coating (glass plates, wafers) - customizable size
- Heated coating plate: Up to 160°C for rapid drying of coated samples
- Cleanroom compatibility: Class 1000-100000 stainless steel design
- Exhaust system: Standard exhaust / Solvent recovery (NMP, VOC treatment)
- Automation: Manual / Semi-automatic / Fully automatic with robotic loading
- Online inspection: Thickness gauge, surface defect detection - customizable integration
Key Features
- Precise thickness control: Comma blade coating with micrometer adjustment enables ±1-2 µm coating thickness accuracy
- Wide viscosity range: Compatible with low to high viscosity coatings (1-10,000+ cP)
- Intermittent coating capability: Start-stop operation for battery electrode tab areas
- Modular design: Interchangeable coating heads and drying sections for process flexibility
- High coating uniformity: Up to ±1% uniformity across full coating width
- Fast drying: Hot air / IR heating with temperature uniformity ±2°C
- Low maintenance: Sealed bearings, stainless steel construction, easy-clean surfaces
- Safety features: Emergency stop, over-temperature protection, exhaust interlocks
- Data logging: Recipe storage, real-time monitoring, USB/Ethernet export (optional)
- Versatile substrate handling: Rolls, sheets, rigid plates, and even pipes
Support and Services
- Free process consulting and material testing - send us your slurry/substrate for trial coating
- Custom layout design for your production floor
- On-site installation and commissioning (customizable support packages)
- Operator training program included
- Remote troubleshooting via video call or IoT monitoring
- 12-24 month warranty on mechanical components (wear parts excluded)
- Spare parts availability from regional warehouses
- Preventive maintenance service contracts available
- Lifetime technical support via phone, email, or chat
Packing and Shipping
Packing:
- Anti-rust film + reinforced plywood case for main body and control cabinet
- Foam padding for fragile components (blades, sensors, control panel)
- Stretch wrap for exposed metal surfaces
- Desiccant bags for electrical parts
Lead time:
- Standard models: 15-25 days after order confirmation
- Custom configurations: 30-50 days (depending on complexity)
- Large industrial lines: 60-90 days
Shipping: FOB Shanghai / CIF by sea, air, or rail
Customizable: Export crating, custom labeling, destination port documentation
Frequently Asked Questions
Q1: What is the difference between a comma coater and a doctor blade coater?
A: A comma coater uses a reverse-rotating comma-shaped blade against a backing roll, providing more precise and uniform coating for medium-to-high viscosity materials. A doctor blade coater uses a stationary blade directly against the substrate or roll, simpler in design and suitable for lower viscosity coatings. Both methods are customizable based on your material viscosity and accuracy requirements.
