Redwood and ebony blanks impulse convective drying
A review of literature sources on the physical and mechanical properties of redwood and ebony is given. A description of the characteristic properties of redwood and ebony wood is given. The place of growth of these species, varieties of properties depending on the area of their distribution are indicated. A review of literature sources on regime parameters for drying redwood and ebony wood blanks is given. The drying modes are given, which depend on the current moisture content of the wood and differ from each other in the initial and final temperatures, as well as the degree of saturation of the drying agent at the initial and final stages of drying. The principles of the structure of pulse modes of wood drying are considered. The modes of pulsed drying of redwood 50 mm thick and ebony 25 mm thick blanks are presented. The initial moisture content of mahogany and ebony blanks was determined according to GOST 16588. The control over the current moisture content was carried out by the method of control samples. And the development of drying stresses is based on power samples. The stresses arising during the drying of the workpieces were evaluated by the relative deformation of the power sections teeth, sawn from the control power samples. The use of pulsed modes allows you to reduce energy consumption and improve the drying quality.