RHEOLOGY & SLOT DIE COATING TECHNOLOGY

SLOT DIE COATING TECHNOLOGY

• Background

• System• Technique• Process

• Summary

BACKGROUND

• Slot die basics

• Closed system• Distribute fluid uniformly• Define coat width• Maintain temperature

BACKGROUND• Slot die applications

• Viscosity versus shear rate• % Solids• Coating thickness• Particle size• Coating width• Line speed• Operating temperature

BACKGROUND

• Slot die design

• Rheology • Manifold• Body sections• Fluid flow control

BACKGROUND

RHEOLOGY• Viscosity• Shear Rate (Stress)

BACKGROUND

RHEOLOGY• Newtonian

• Polymerico Shear thinningo Shear thickening

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CASSON

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BINGHOLD

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ITHERS

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THIXOTROPIC

BACKGROUND

RHEOLOGY• Process Knowledge

o G’ (storage)o G” (loss)o tan

SYSTEM

• Slot Die• Positioner• Backing roll• Fluid delivery system• Substrate

SYSTEM

• Slot Dieo Manifold designo Manufacturing toleranceso Lip offset o Lip geometry

SYSTEM

• Slot Dieo Fixed lipo Flex lipo Rotary rod

SYSTEM

• Positionero Attack angleo Position to rollo Repeatability

SYSTEM

• Backing rollo Diametero TIRo Cocentricityo Cylindricity

SYSTEM

• Fluid Delivery Systemo Positive displacemento Rheology of fluido Densityo Particle sizeo Shear sensitivity

SYSTEM

• Substrateo Variation (RTY)o Surface energyo Surface treatmento Vacuum boxo Tension control

TECHNIQUE

TECHNIQUE

• Direct coating

TECHNIQUE

• Tensioned web

TECHNIQUE

• Curtain coating

PROCESS

• Full width coating• Lane coating• Intermittent coating• Multi-layer coating• Dual-sided coating

SUMMARY

• System• Technique• Process