Thermal print heads

The lack of heat in this process can allow for a greater variety of inks to be used, and, although more expensive than thermal print heads, piezoelectric print heads are currently favored for textile printing (Freire, 2006, p. 48). 

K. Bab et al., Formation of Thin Film Resistors By Use of Metallo-Organic Deposition Method and its Application for Thermal Print Head, Proc. Inti. Symp. Microelec., Seattle, pp. 381-386, 1988. 

Figure 2.35 Cross sections of thermal/bubble Jet and piezo DOD print heads.

Printing (printing heads, thermal recording media)58... 

Figure 95 Thermal transfer (i) Typical print heads (ii) Cross-section of machine...

In the case of thermal IJ print heads, where the surface of the firing resistor is briefly heated to a very high temperature, no deposition on the resistor should take place. Such a deposit is thermally insulating and usually damages the resistor irreversibly. Preventing this phenomenon adds additional requirements to the ink purity and composition. 

The ejection process of an ink drop from a thermal inkjet (TIJ) print head begins as an electrical pulse is apphed to a resistor. Within 2-5 microseconds, the resistor surface reaches a temperature of... 

Fig. 1. Ejection cycle of a thermal inkjet (TIJ) print head.

Electrical (printed circuit boards, recording media, insulations) [57] Printing (printing heads, thermal recording media) [58]... 

Thermal transfer printing is the selective heating (computer-controlled) and cooling of small elements in a print-head which can be used to impress a one-use thermal ribbon onto the substrate surface. Resolutions of up to 12 dots per mm can be achieved. 

P. Chen, W. Chen and S. H. Chang Bubble growth and ink ejection process of a thermal ink jet print head. International Journal of Mechanical Sciences, 39 (6), 683-695 (1997). 

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