This research was study the production of essential oil from tobacco leaves for insect repellents. To increase value and development of new products form tobacco leaves. This product is environmental friendly. In this research is divided into two parts: Laboratory scale and get a knowledge to the municipal in Nhongkhai province. Nicotine is an insecticide that effect to insects. This product evaporated pass through natural packaging. A natural packaging can be easily degradation in the environment. Moreover this product also helped to reduce the hazardous chemicals or pesticides usage and not residues for long time.

This research work was to study the effect of surface treatment of natural fiber and the effects of type and content of natural fiber on the development of acoustic material from natural rubber foam /natural fiber composites. The surface treatment used for this research work was sodium hydroxide (NaOH) treatment. NaOH Concentrations and treatment times were varied from 0 to 15 %wt. and 0 to 30 min respectively. Natural fibers used for this work were bagasse fiber (BF) and oil palm fiber (OPF). The suitable condition for surface treatment was estimated by fiber length and diameter (L/D) ratio and morphology of natural fiber. The result suggested that L/D ratios tended to increase when NaOH concentrations and/or treatment times increased except for NaOH concentration of 15 %wt. L/D ratios of OPF after surface treatment were changed more than those of BF. The suitable conditions of NaOH treatment for BF and OPF were NaOH concentration of 10 %wt. and surface treatment times of 30 and 10 min respectively. The effects of fiber type and content on sound absorption properties of natural rubber foam /natural fiber composites were investigated by cell characteristics sound absorption coefficient DMA analysis and bulk density. Both treated BF and OPF with suitable treatment condition were varied from content of 0.0 to 10.0 %wt. The result showed that the cell size of composites tended to decrease with addition of natural fiber whereas number of foam cell per unit volume increased. After adding natural fiber more than 2.5 %wt. cell size of composite foam and number of foam cell per unit volume tended to change the inverse direction. Natural fiber in composites enhanced the sound absorption efficiency. Sound absorption coefficient of composites adding BF was more than that of composite adding OPF. The addition of natural fiber enhanced the elasticity of composites and that increased sound absorption efficiency. NaOH treatment led to creation of strong interfacial bonding between natural fiber and natural rubber and enhanced the sound absorption efficiency. Density of NR composite foam increased with increasing natural fiber content.

A study of the watermelon rind the right to produce the best recipe Watermelon Cake. The ratio of the total amount of chicken. The third level is 28:17 watermelon rind that has an average overall score 7.03 7.00 7.00 6.73 6.70 and 7.13 respectively which are significantly different statistically (P ≤ 0.05) and bring. Education shelf life of the product mix cakes frozen watermelon rind. Physical chemical and microbiological By the cake mix frozen watermelon rind packed into plastic boxes sealed and stored at -21 ° C for 4 months the product remains safe for consumers since total microorganisms. Tub Tim Krob with watermelon rind The best include Ruby dissolves the calcium chloride 0.5 percent in the conditions of frozen watermelon rind. Because of its hardness and adhesion of the powder of ruby. Ratio of water to sugar syrup soaked watermelon pomegranate peel 3 46:11 there was swelling of ruby little different to that ratio. Water and sugar at 44:13 to the physical quality. By measuring the diameter of the shade water activity (aw) chemical properties of soluble solids content of 24.5 oBrix Then Tub Tim Krob. The color is a reddish color sai l * 22.27 26.46 and b * 3.06. Watermelon rind Loy Kaewlittle panelists found that the scores of recipes that use fresh pandan leaves into the water. The total soluble solids (% TSS) 19 0Brix because when it is refrigerated and eaten immediately do not add ice. Then compare the products on the market float. The watermelon rind is colored green and red titratable acidity - alkalinity (pH) were similar in the range of 4.00 to 5.00 due to the taste by crystallized. Add sour citric acid is used. Keep up the cause of the damage is difficult. Could be stored for at least 2 weeks product is safe for consumption. Consumer satisfaction with the products have moderate inclination. Dehydrated Watermelom Rind Reasonable temperature and drying time is 55:17 hrs. Most dried watermelon rind preserves the color brightness (L *) 25.22 the redness (a *) 5.64 and yellowness (b *) 10.45. and water activity 0.53 which is the standard set. Moisture 13:17 shelf dehydrated watermelon rind. Stored in plastic bags Sealed with a separate piece of heat stored at room temperature for 2 weeks it is safe to consume. The Resort complying and a community standard dry fruits study found that consumer acceptance. Consumers who have found a dehydrated watermelon rind like moderately satisfied.

The optimal pretreatment condition of coconut husk by physicochemical methods for biogas production was investigated. The coconut husk was dried and ground into powder (~0.1 nm) and was then determined for chemical contents such as cellulose hemi-cellulose and lignin respectively. The chemical contents of cellulose hemi-cellulose and lignin were 35.67±2.02 7.41±0.69 and 40.82±0.62 w/w respectively. After pretreatment with 4 different methods the results showed that the pretreatment of sodium hydroxide 30 % (w/w) gave the highest chemical contents of cellulose hemi-cellulose and lignin with 43.30±0.03 33.69±7.48 and 27.36±0.03 w/w respectively. As for the biogas production the result showed that the ratio of coconut husk to cow dung of 1:4 with C:N ratio of 23:1 gave the highest cumulative biogas of 442.6 ml for 30 days. Methane and carbon dioxide contents were 46.1 and 23.1 %. Moreover the removal percentages of the total solids (TS) volatile solid (VS) suspended solids (SS) and COD were 69.3 32.5 50.0 and 58.4 % respectively. The coconut husk could be used as an alternative material for the application of biogas production with cow dung in the near future.

At present a problem found in the soft candy producing process in the food producing department of Company Case Study is time-consuming roller washing process due to an ineffective washing process. A roller is washed one by one from a total of 10 roller (a set) in one machine. As a result the operation rates of other producing processes have been forced to delay. The objective of this research is to resolve the problem found in the process of roller washing by designing a machine for washing a set of roller per time. The research begins from examining design concepts of roller washing machine from patents and the current quantity of water and stream used for washing before conducting design of a new soft candy type roller washer machine. And eventually the efficiency of new roller washer machine is compared with current one. The findings indicate that the newly developed design can reduce washing period from 24.48 minutes/set to 5.56 minutes/set and increase operation time by 18.92 minutes or accounting for 77.28 percent. Meanwhile water quantity used in the process is reduced from 124.82 liters/set to 28.35 liters/set and stream quantity used in the process is also contracted from 0.83 kilogram/hour/set to 0.18 kilogram/hour/set. This reduction can save expenses equal to 28795 baht/year. As the budget for making new roller washer machine is 53000 baht and payback period is only 1.84 year.