Electric power resistance and pulse resistance.
Power resistance and pulse resistance refer to the durability of the heat emitter under the condition of power pulse driving the print head. The criterion for judging this is SST (Step Stress Test).

What is SST? ...

Set the pulse period and pulse width to the same conditions, drive with a certain power for 10,000 pulses, and then check whether the current impedance value changes compared with the original resistance value. 10,000 pulses are a step, and the power is slowly increased at each step for observation, which is used to evaluate durability.

In order to improve pulse durability, Kyocera began to develop new impedance materials, so that users can use stable products with little change in upper impedance value.

Resistance to physical wear.
The thermal print head is in direct contact with thermal paper and carbon tape, and friction will occur during paper feeding. Especially, barcode printers used in industry need to print at high speed, and consumables also need to use materials with strong oil resistance and low friction. Physical wear resistance is an important performance that influences the life of printers. Kyocera rationally develops protective film varieties according to various customer demands, and DLC (Diamond Carbon Fiber) high-durability protective films for film formation are also possible.

Environmental resistance
In recent years, the devices that use thermal print heads around us have gradually increased. For example, the card issuing machine in the parking lot, the outdoor parking lot will be exposed to the wind and rain, which is a very bad environment for printers. As a key material, thermal print heads are increasingly required to improve their environmental resistance. Through the improvement of protective film materials and processing conditions, we are gradually improving the environmental resistance.