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Advances in slot die coating technology for hot melt adhesives

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Slot die coating technology is often used in hot melt coating for adhesive industries. Get technical information in this presentation.

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Advances in slot die coating technology for hot melt adhesives

  1. 1. ADVANCES IN SLOT DIE COATING TECHNOLOGY FOR HOT MELT ADHESIVES
  2. 2. INTRODUCTION • Hot melt adhesive coating • Extrusion coating • Liquid coating
  3. 3. INTRODUCTION • Internal similarities • External variations • Hot Melt o Versus Extrusion o Versus Liquid
  4. 4. Distribution chamber Feed port Slot gap Lip land INTRODUCTION • Internal similarities • Hot Melt o Versus Extrusion o Versus Liquid
  5. 5. INTRODUCTION • External variations o Coating technique • Hot Melt o Versus Extrusion o Versus Liquid
  6. 6. INTRODUCTION • External variations o Heat effect • Hot Melt o Versus Extrusion o Versus Liquid
  7. 7. ADHESIVE RHEOLOGY (VISCOSITY & ELASTICITY) • Viscosity (shear rate versus viscosity) • Elasticity (stress and velocity interaction)
  8. 8. ADHESIVE RHEOLOGY (VISCOSITY & ELASTICITY) • Defects o Wrinkle o Curl o Voids o Die Swell o Edge Beads
  9. 9. ADHESIVE RHEOLOGY (VISCOSITY & ELASTICITY) • Solutions o Wrinkle/Curl = reduce stress at coating or during curing o Voids = limit of process o Die Swell = reduce internal stress o Edge bead = slot to substrate gap
  10. 10. EQUIPMENT DESIGN • 3D FEA
  11. 11. EQUIPMENT DESIGN • System influence o Slot die o Positioner o Roll o Fluid delivery  Adhesive formualtion o Substrate  Web handling/tension
  12. 12. OPERATION • Variables o Lip gap o Lip offset o Lip geometry o Attack angle o Die to substrate gap
  13. 13. OPERATION • Limitations o Line speed  3280 feet/min (1000 meters/min) o Coat weight  1 mil (25.4 microns)*
  14. 14. OPERATION • Slot die design o Flex lip  >3 mils (76.2 microns) o Rotary rod lip  1-3 mils (25.4-76.2 microns)
  15. 15. OPERATION • Slot die design o Flex lip  >3 mils (76.2 microns)
  16. 16. OPERATION • Slot die design o Rotary rod lip  1-3 mils (25.4-76.2 microns)
  17. 17. OPERATION • Roll interaction o TIR < 0.0005 in (12.7 micron) o Concentricity < 0.0005 in (12.7 micron) o Cylindricity < 0.001 in (25 micron) o Ra < 4 micro-in (0.1 micro-m) o Durometer (90 Shore A) o Rotary rod lip  1-3 mils (25.4-76.2 microns)
  18. 18. CONCLUSION • Hot melt coating = crossroads of technology • Viscoelasticity • Temperature effects • System influence

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