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Thermal Printing Outline

Nip Mechanics - Roller Transport

  • How Fast Do Rollers Transport Sheets?
  • Roller Materials
  • Effects of Tension and/or Friction
  • Pressure and Friction Forces in Nip
  • Edge Effects and Axial Variation
  • Conical Rollers for Edge Registration

Nip Mechanics - Pressure

  • Pressure in the Nip
  • Difference Between Head Load and Head Pressure
  • What Design Parameters Govern Peek Pressure and Pressure Uniformity
  • Platen Stiffness, Receiver Stocks, Head Load, Axial Effects
  • Bead Alignment - Why Does it Change?

Mechanical Wrinkling

  • The Common Causes Of Mechanical Wrinkling
  • Characteristic Wrinkling Patterns
  • Wrinkling Control Through Tension Optimization

Thermal Wrinkling

  • Basic ribbon Mechanical Properties
  • The Deformation of ribbon Under Temperature And Tension
  • Choosing Tension To Reduce Thermal Wrinkling
  • RHTF - Rapid Heat Test Fixture
  • Comparison Of Various PET's Under Thermo-Mechanical Testing
  • Comparison of Experimental Properties to Actual Wrinkle Performance in a Printer

Peeling

  • Effects Of Peel Angle, Peel Rate, Peel Temperature
  • What Is Your Peel Angle Effects Of Pulse Modulation Schemes

Winding (Optional)

  • Common Winding Defects
  • Computing Pressures And Tensions In A Wound Roll
  • Effects Of Tension Profile And Tension Levels
  • Predicting Core Pressures And Deflections

Temperature and Dye Flow

  • What Is The Print Bead Temperature – temperature flow
  • Thermal Transfer (Wax or Resin Transfer), Direct Thermal, Dye Sublimation – How do they differ?
  • Effects of Pulse Modulation Schemes
  • History Control

Media Motion in Channels (Optional)