ALAT PENGERING ZAT WARNA ALAMI (Spray Dryer) TIPE KONTINYU BERLAWANAN ARAH DENGAN MENGGUNAKAN UDARA PANAS

The use of natural coloring essence has been replaced by sintetic coloring. Since the result of the natural coloring is in the liqud form that makes it difficult to be applied and it is less practice. This liquid coloring is dryed into powder with a spray dryer. The aim of this final asigment is to design and to make a coloring spray dryer and to know how this tool works. Spray dryer uses continous system, in which the materials are mixed with nozzle to make them into small particles. These small particles are directly contacted to the hot air to make powder. Spray dryer contains of two main equipments, they are nozzle and dryer tank. Nozzle is made of brass with 0,5 mm in diameter used to mix the coloring essence to make them into small particles. The dryer tank is made of galvanic plat with 40 cm in diameter, 220 cm in height, maximal volume 600 liter, and effective 500 liter. The other equipment supports are compressor, blower and belt conveyor. The extract of teak have color is gained by boiling it. 500 ml coloring essence is driyed in 778 seconds produces 86,15 grams dry powder. In one day, it takes 18,5 liters color essence to produce 3187,55 grams powder with 8 hours operation time. The operation of spray dryer uses continous system that can run well and produce 93,99% heat efficiency. This color essence powder has been tested in textile and produces the average colors in whole fabrics