An important economic plants as longan and Northern retaining old longan, but shorter and easier. By the way good seafood factories which lampoon s enterprises processing agricultural crops by production of dried longan has a limited number of oven cause the longan came together a lot. To plant fresh longan longan could wait before going to sweet water with baking process flows. When dried, and then make a lower price in the sale. This research project aims to find ways to extend the life of fresh longan, longan and so industrial processing dried longan and life after by an acceptable quality. That means extend the life of fresh longan is made by soaking in a solution of longan shell. This research has been applied to design, try the full factorial-2k to find the most suitable conditions for fresh longan life processes by studying 3 factors: temperature, dissolved substances and longan ratio per bag. Do all the experiments repeated 4 to find the most appropriate response including longan color values should have minimal value. The quantity of a soluble solid (sweet) should be the most acid and alkaline is greater than 5 mm up to. The results found that the factors that influence the response of longan significantly include AB joint interaction factor is the temperature ratio longan per solution and factors that affect yield, quantity of soluble solid (sweet): A factor is temperature, is the C factor bags and joint interaction factor is a BC ratio longan per solution and bags. By creating an equation to calculate the relationships to find optimal conditions for the last model. From processing by the program MNITAB as follows: return the color of a longan yield and quantity of 4.5425 solid soluble (sweet) is equal to 19.7450, which is the appropriate level of oBrix each factor is the temperature of 5° c. Compression ratio: 1: 1 solution, longan and coated glove (Al/PE) When the trial results confirm by repeating the experiment, and the results are averages and compare with the values from the original research of fresh longan. I found that the average performance confirmation experiment offers the value closest to value equation to predict results. Therefore, this result can extend the life of fresh longan has 7 goals and make there life processes after the longan quality acceptable. Then in the section of Economics engineering If you apply this method to extend the life of fresh longan requires more expense, but they are also 1080 baht 825.45 income increase in 1355, 230.55 baht due to be sold at a price of 38 baht per kilogram, therefore, concluded that all of the money as an investment.
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