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The drying of products, understanding as such the dehydration of the same ones, it is a very old technique used for the conservation of the foods and other applications like it is the wood. This drying was carried out with the use of the solar energy and with the wind. This technique still comes using, although most of the processes require of this basic operation in a more industrial way. The certain thing is that, in spite of being an old technology, it is not highly developed and until few years ago these industrial processes were quite imperfect and they gave insatisfactorials products as a result.