Rheology and Slot Die Coating Technology
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Transcript of Rheology and Slot Die Coating Technology
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
.
.
CASSON
.
BINGHOLD
.
ITHERS
.
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