The pressing process defines the quality of plywood through the interrelation of the technological properties of wood, the adhesive characteristics, and the interaction of temperature and pressure generated in the hot press. This study was carried out in order to analyze the effect of heat transfer on the polymerization of adhesives formulated with urea and phenol formaldehyde and to optimize the pressing schedules of 6, 9, 12, 15, 18 and 34 mm plywood thickness, as well as to evaluate the compaction of boards as a result of temperature and pressure during the hot pressing cycle. Veneer of Pinus herrerai Martínez, P. michoacana Martínez, and P. pseudostrobus Lindl. at a moisture content of 6 to 8 % was used as well as a press heated with steam and urea formaldehyde, to produce boards 6, 9, 12, 15 and 18 mm thick, and phenol formaldehyde for the 34 mm plywood. Pressing cycles with temperature of 115, 130 and 140 °C and pressures of 10.62 kg·cm-2 (151 psi) and 8.51 kg·cm-2 (121 psi) were analyzed for interior use, and for exterior type boards temperatures of 140, 150 and 160 °C and pressures of 12.23, 13.29 y 14.34 kg·cm-2 (174, 189 y 204 psi) were also evaluated. The temperature of the outermost glue lines increases rapidly with the closing of the press, maintaining a difference with the innermost glue line, which tends to disappear with the pressing time, becoming similar at 73 % of pressing time for each type of board. It was determined, through the evaluation of the adhesive characteristics of the interior type glue with the PS1-95 standard, that all boards fulfill the specifications for that type of application. In the 34 mm thickness boards, the temperature was raised from 140 to 160 °C, the pressure from 12.23 to 14.34 kg·cm-2 (174 a 204 psi) and the phenol formaldehyde solid content from 29.9 to 32 %, as a result, a reduction on pressing time by 28.6 % (35 to 25 min) and 1.8 % in compaction were achieved; furthermore the delamination problems of these type of boards were eliminated.