  We study in this paper mechanisms of hadron melting based on the spectral
representation of hadronic quantum channels, and examine the hadron width
dependence of the pressure. The findings are applied to a statistical hadron
model of QCD thermodynamics, where hadron masses are distributed by the
Hagedorn model and a uniform mechanism for producing hadron widths is assumed.
According to this model the hadron - quark gluon plasma transition occurs at
$T\approx 200$-250 MeV, the numerically observable $T_c=156$ MeV crossover
temperature is relevant for the onset of the hadron melting process.
