The most widely used and most general method of tablet preparation is the wet-granulation method. Its popularity is due to the greater probability that the granulation will meet all the physical requirements for the compression of good tablets. Its chief disadvantages are the number of separate steps involved, as well as the time and labor necessary to carry out the procedure, especially on a large scale.
Tray Dryer is the most conventional Dryer used very widely and still being used where the moisture content is more and where the product has to be dried at low temperature for long hours.
It is fabricated out of rigid angle iron frame with double walled panels insulated with best quality compressed fibre glass and with a rigid door fitted with strong hings and best choosen locking arrangement. A control panel is fixed in front of the oven to facilitate the operation easily. The steps in the wet method are weighing, mixing, wet massing, screening the damp mass, drying, dry screening, lubrication, and compression. The equipment involved depends on the quantity or size of the batch and the percent active ingredient per total weight of the tablets.
Tray Dryer Working Principle – A dryer utilized for drying of the wet products like crude drugs, chemicals, powders or the granules, etc. is known as tray dryer. A laboratory oven is the elementary form of it which contains a cabinet with a heater at the bottom. The values of these ovens are very less because of its uncontrollable heat transfer or humidity meter.
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The material which we want to dry is dispersed on the tiers of the trays. The tray, which is used in this process must have perforated, solid or wire mesh bottoms. For the circulation of the air across the drying materials, we lined the screen trays with paper. A limited amount of heat is provided to every shelf at that time when the wind passes over it to provide the latent heat of vaporization. This kind of dryers provides proper control of humidity and temperature.