The different layers of a thermal paper

Our thermal papers consists of a base paper coated with four different chemical layers (three on the front and one on the back side)  that confer them their thermal (heat sensitive) and protection properties.

First an under layer (insulating coating) then the thermal layer (heat-sensitive coating). After that two protective layers are added on each side (top and back protection).

 

TOP COAT

This layer prevents any image fading against different types of aggressions such as alcohol, oil, water, etc.
It also ensures a good matching with the printer and preserves the TPH lifetime.

 Thermal paper over coat

THERMAL COAT

This layer induces the following criteria:
- sensitivity
- image density
- image preservation
- background density                                                                                                                            

                               

 Thermal paper thermal coat

UNDER COAT

This layer enables the heat generated by the thermal head to be concentrated in the thermal layer. Thereby, the thermal reaction is optimised as well as the following properties:
- sensitivity
- brightness
- image

Thermal paper under coat

BASIS SUPPORT

The basis support is composed of paper or film of different thicknesses. It gives to the thermal paper / film the following properties:

- Characterizes the thickness and the weight of the support.

- Gives mechanical properties to the thermal paper / film (tensile and tear strength).

- Determines the uniformity of the thermal image.

 Basis support


BACK COAT

This layer ensures an excellent protection level against the effects of different substances such as alcohol, oil, plasticisers, etc.

It prevents also the paper from curling and enables the use of solvents, inks and adhesives.

 Thermal paper back coat