This project is a study of dried noodles rank infrared and hot air. And to study changes in the color of dried noodles. Drying start drying, infrared radiation, wind speed 1.0 m / s and are from 200-600 W infrared distance between the radiation source and the sample 200 mm as a break in the second stage. The first step to take samples from room temperature until the samples have stayed in the ambient air temperature. And finally dried with hot air at wind speeds of 1.0 m / s and the air temperature from 40-60 ° C down to a moisture content of about 15% db. The study infrared radiation in the infrared one at 200. 400 and 600 W for a long time, 105, 60 and 30 minutes respectively, which can reduce the moisture content of approximately 300 ± 10% db. to 197.44 ± 8.38, 156.98 ± 4.09 and 137.32 ± 14.57% db., respectively, if the drying to. IR radiation to provide a product that looks tarnished burns. The drying rate is. 0.0099 ± 0.0010,0.0227 ± 0.0010 And 0.0558 ± 0.0034 gwater / min • gdry matter, respectively, and can raise the temperature a pile of noodles 26.67, 43.20 and 51.03 ° C by the drying rate increased when infrared rise. Given the right conditions, the infrared drying should be dried at 400 W for 60 minutes in the second stage as a break is found that when the temperature break for 15 minutes Materials Division to room temperature. By drying in this period has resulted in the drying. Then bake in hot air. By starting the drying with infrared radiation, followed by a break. Then, the samples were dried with hot air at 40.50 and 60 ° C until dry noodles found that the drying rate is 0.0050, 0.0076 and 0.0096. gwater / min • gdry matter the drying time is 270, 180 and 150 minutes, and the drying effect throughout the process. The average drying rate in the range 0.0078 to 0.0127 gwater / min • gdry matter and drying time average 225 to 345 minutes of drying behavior. Found that infrared drying. And drying with hot air. Will be displayed only during the drying rate decreases. As a result of the break, so the drying will consider only the infrared rays, followed by drying with hot air. The study of the drying kinetics constants in the equation of Newton, Page, Modified Page and Henderson and Pebis by the constant drying. The constants of the equations of Newton are 9.9217x10-3 to 1.4898x10-2 min-1, k and n the constants of the equation Page 3.3167x10-3 to 1.4468x10-2 min-1 and 92.8739. x10-2 to 11.5911x10-2 min-1, k and n the constants of the equation are the Modified Page 9.9608x10-2 to 10.5190x10-2 min-1 and 9.9608x10-2 to 10.5190x10-2 min-1. , and a constant k of the equation Henderson and Pebis the 99.5024x10-2 to 103.0109x10-2 min-1 and 7.4893x10-3 to 1.5282x10-2 min-1, respectively, by the constant k 4. The rising trend When infrared and hot air temperature increases
, the study of changes in color caused by the drying stage. By measuring the brightness (L *) The red (a *) and yellowness (b *) as standard CIE Lab Scale showed that the drying time was increased, the L * values decrease. and when added in step one infrared and hot air temperature in Step 3 to make the L * a downward trend, while the a * and b * values increase. When drying time increases The increase in air temperature, infrared and a * and b * values are likely to decline. The analysis showed that changes color. The difference in color (ΔE) value increases with time. Infrared and hot air temperatures are on the rise. The study constant kinetics of color changes include A, B, k, k0 found that the A ranges -6.72x10-6 5.84x10-4 min-1 to B value ranges -4.27x10-. 3 to 1.29x10-2 min-1 k values ranges -9.07x10-3 to 13.0x10-2 min-1 value k0 ranges -19.2x10-2 to -11.1x10-2 min-1.
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