Gear Pump Specifically For Slot-Die Coating Processes

The gear metering pump designed for slot-die coating is a high-precision, low-pulsation positive-displacement pump, developed specifically for roll-to-roll continuous slot-die coating processes.

Its primary objectives are to ensure highly stable flow rates, minimize pressure pulsations, and achieve uniform film thickness-effectively eliminating coating defects such as transverse streaks, longitudinal streaks, and variations in thickness.

Serving as the critical fluid-supply unit for slot-die coating-widely used in the production of optical films, lithium-battery separator films, and flexible substrates-the pump operates via a closed-loop servo system synchronized with the web speed, allowing for precise, stable control over the wet film thickness.

Material of gear pumps

1. Gears: 440C hardened gears (optional DLC/diamond-like carbon coating available); feature high wear resistance and excellent dimensional stability.
2. Pump Body / Pump Cover: 440C.
3. Bearings: Tungsten carbide, 440 stainless steel bushings, graphite, or silicon carbide.
4. Seals: PTFE, FFKM.
5. Drive System: Servo motor or variable-frequency drive (VFD) motor; supports communication-based integration with coating-line PLCs. A magnetically coupled, leak-free configuration is also available.
6. Construction: Jacket-style thermal insulation or electric heating.

Technical Specifications

- Displacement per revolution: 0.3 – 100 cc/rev (micro-displacement models for laboratory-scale trials; high-displacement models for large-scale production)
- Flow rate range: 0.036 – 10 L/min
- Maximum pressure: 70 bar
- Fluid viscosity: 0.5 – 300000 cP (suitable for UV adhesives, photoresists, PVDF solutions, binders, and coatings)
- Fluid temperature: -20 – 180°C (via jacketed temperature control)
- Metering repeatability: ±0.2% to ±0.5% (with servo drive)

Typical Applications

1. Optical Films: Slot-die coating of PET/PI optical films, OCA (optically clear adhesive) films, quantum dot films, anti-glare films, AR (anti-reflective) films, and UV-curable adhesives.
2. Lithium-ion Battery Films: PVDF coating for ceramic separators, solid-state electrolyte coatings, and functional coatings for pouch-cell batteries.
3. Semiconductors / PCBs: Slot-die coating of photoresists and solder mask inks.
4. Flexible Materials: Coatings for hydrogels, functional layers, perovskite materials, and MEA (membrane electrode assembly) components for fuel cells.
5. Adhesives Industry: Precision slot-die coating of two-component adhesives, polyurethane adhesives, and pressure-sensitive adhesives (PSAs).

FAQ:

Q1: What is the key advantage for slot die coating?

A: Multi-tooth gear design for ultra-low pulsation, servo synchronous control with coating line speed. It eliminates coating stripes and ensures uniform film thickness.

Q2: What wetted material options?

A: 440C with DLC coating, 316L stainless steel or PEEK for different coating liquid. Seal: PTFE / FFKM.

Q3: What is the metering repeat accuracy?

A: Servo version repeat accuracy ±0.2~±0.5%, low flow fluctuation for precise wet film thickness control.

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