DEVELOPMENT OF RICE STRAW PROBUCT BY USING MECHANICAL PULPING

Abstract

The supply of timber has been unable to fulfil the requirements of global demands so it is more necessary to switch toward other alternative raw materials. The agro based residue biomass served the above requirements. In this study rice straw choose as raw material to convert into a suitable product. The rice straw is one kind of crop residue, which is used as feed for animals, fuel, and fibre. Due to low apparent density and moderate calorific value and high silica content, rice straw left in the field after harvest and open field burning which cause global warming problem. The rice straw having cellulose and hemicellulose, which make the straw products contain acceptable strength properties to make product and replace product made of wood. The product made by mechanical pulping. The board contain no chemical adhesives, so recovery of chemicals is eliminated which is more difficult due to high silica content in rice straw and does not causes any pollution. According to result of testing, the rice straw board was made successfully by mechanical pulping. The second objective to enhance the strength of rice straw by blending SW and HW separately without adding any chemicals and these blended, duplex boards are converted into moulded bowl. In this project also work on the comparative study of effect of two pulping variables soaking temperature and disc gap of refiner on the strength index’s and % yield