58mm ESC POS 90mm second POS 58 printer

thermal driver hotel bill receipt printer

Early formulations of the thermo-sensitive coating used in thermal paper were sensitive to incidental heat, abrasion, friction (which can cause heat, thus darkening the paper), light (which can fade printed images), and water. Later thermal coating formulations are far more stable; in practice, thermally printed text should remain legible at least 50 days.[citation needed]

Hospitals commonly record fetal ultrasound scan images on thermal paper[why?]. This can cause problems if the parents wish to preserve the image by laminating it, as the heat of most laminators will darken the entire page—this can be tested for beforehand on an unimportant thermal print. An option is to make and laminate a permanent ink duplicate of the image.