how to avoid abrasions of printhead?

Factors that cause premature damage to the print head Scratching-Long-term movement of the label tape through the print head will wear away the protective layer of the ceramic coating, causing the print head pins (dots) to be exposed and eventually damaged.
Clean the print head frequently and use a high-quality, smooth, back-coated thermal transfer ribbon to reduce friction.

Minimize print head pressure and print temperature.

Make sure the ribbon width is wider than the label to prevent the exposed print head from being scratched by the label.