Watcharin green Krai (2551) studied the design and development of devices that enter the hay balers, semi automatic. Compressed straw Donnell Hunt by the principle of uniform valuation of the newly developed cost around 100,000 baht, not including the price of engine power. Work rate of 28 bales / hour scheduled work hours, 8 hours / day, 90 days / year worker three people for balers traditional cost about 50,000 baht at work 29 bales / hour work 8 hours / day. and 90 days / year worker was found that four people. Break of compressed straw and traditional developed at 866 and 438 bales / year, respectively, for the period of payback found. Both machines can be compressed straw bales, more than 20 000 / year.
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