Printed Electronics & Energy Storage
Roll-to-Roll (R2R) Slot-Die Coating Shim & Tooling Vector Guide
Slot-die coating is the premier technology for high-speed, continuous roll-to-roll manufacturing of battery anodes/cathodes, flexible solar films, and optical displays. Learn how to engineer precision stainless steel vector shims, model coat-hanger distribution manifolds, and prevent heavy edge-bead defects.
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1. Premetered Slot-Die Coating Principles
Unlike self-metered coating processes (such as dip or blade coating) where wet film thickness depends strongly on fluid viscosity and surface tension, slot-die coating is a premetered process. A positive displacement pulse-free pump delivers slurry at an exact volumetric flow rate $Q$ across coating width $W$, directly determining wet layer thickness on a web moving at speed $U_w$:
$$h_{\text{wet}} = \frac{Q}{W \cdot U_w}$$
The dry film thickness after solvent evaporation is given by $h_{\text{dry}} = h_{\text{wet}} \cdot \text{Vol}\%_{\text{solids}}$. Precision stainless steel or titanium shims (typically 25 µm to 250 µm thick) sandwiched between die halves define the slot geometry, internal fluid distribution, and coating stripes.
2. Engineering Specifications & Tolerances
| Coating Application | Slurry Viscosity | Target Wet Thickness | Solids Vol % | Recommended Shim Thickness |
|---|---|---|---|---|
| Li-Ion Battery Cathode (NMC/LFP) | 2,000 – 6,000 cP | 80 – 250 µm | 45% – 60% | 150 – 300 µm Shim |
| Perovskite Solar Active Layer | 5 – 30 cP | 5 – 25 µm | 10% – 20% | 50 – 100 µm Shim + Vacuum Box |
| OLED / Display Polymer Layer | 10 – 150 cP | 2 – 15 µm | 5% – 15% | 25 – 75 µm Shim |
| Transparent Conductive Film (AgNW) | 1 – 15 cP | 10 – 40 µm | 2% – 8% | 50 – 100 µm Micro-Slot |
3. Vector CAD/CAM Guidelines for Slot-Die Shims
- Coat-Hanger Manifold Contour Vectors: Shape the internal distribution channel with a non-linear taper that maintains uniform pressure drop across the entire web width.
- Edge-Bead Relief Chamfers: Incorporate 15°–30° outward lead-in tapers on shim side ears to control dynamic meniscus contact line pinning and prevent thickened 'heavy edges'.
- Intermittent Stripe Coating DXF: Format multi-stripe slot shims with bridge webs (W ≥ 2.0 mm) between open coating channels to maintain structural stiffness under 10–50 bar clamping torque.
- Laser Micro-Cutting Tolerances: Laser cut 316L shim vectors using femtosecond or fiber lasers with kerf compensation of ±0.005 mm to avoid edge burrs that cause streak defects.
- Export Format: Clean 1:1 metric DXF with closed boundaries, discrete layers for Shim Outer Perimeter, Coating Aperture, and Alignment Dowel Holes.
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