METHOD OF RESTORING FIBER MATERIAL DAMAGED BY MOISTURE Russian patent published in 2005 - IPC

FIELD: drying solid materials.

SUBSTANCE: method comprises setting the object in the working chamber and performing cyclic sublimation drying. During each cycle, the chamber is evacuated and its walls are heated up to a given temperature, dry air is supplied to the chamber to rise pressure in the chamber, the object additionally undergoes microwave heating, and, then, heating and air supply stop, and the chamber is evacuated again. During the drying, the temperature is measured with the use of thermocouples, and weight is measured with a spring balance. The walls may be heated with infrared heaters up to a temperature of +25 - +30°. When a book is treated, the thermocouples are arranged over the height of the book and inside it, and heating is performed in each cycle until temperature inside reaches 0°C. The drying stops when the temperature throughout the cycle exceeds 0°.

EFFECT: improved quality of drying.

2 cl, 4 dwg