Studios on the Improvement of Stationary Onion Topper

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Other Title
  • タマネギ用定置式タッパの改良試験
  • タマネギヨウ テイチシキ タッパ ノ カイリョウ シケン

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Experiments on onion topper were conducted for different types of retarder to determine the effects on topping performance. The results obtained are summerized as follows;<br>1. Fixed type rertader<br>Two types of retarder, net covered and tined type, were used (Fig. 2). The net covered type retarder did not give satisfactory topping performance. The tined type retarder was a little mare effective than net covered type and miss-topped bulbs were reduced to 7.4% when the harvesting rate of bulbs was less than 2.6ton/hr.<br>2. Rotary retarder<br>Higher revolving speed of retarder resulted in higher topping performance. However, greater harvesting rate of bulbs resulted in more miss-topped bulbs. On the other hand the topping performance at different angle of screen slope was not evident. When the harvesting rate of bulbs was less than 5ton/hr and topper was set at 35-50rpm revolving speed of retarder and at the angle of screen slope of 1.5-3.0 degrees, miss topped bulbs were able to be reduced to 1.5%.<br>The topping performance at different harvesting term was investigated. In these experiments topping was done at the rate of 5ton/hr and topper was set at 48.7rpm revolving speed of retarder and at the angle of screen slope of 3 degrees. In the case of early harvesting term (September 12), the stripped and damaged bulbs were only 0.7%. However, miss-topped bulbs reached about 24% under non-curing tops condition (a moisture content of tops was 69.1% and a green tops ratio was 59.4%). In the case of latest harvesting term (October 2), miss-topped bulbs were decreased 4.0% and the stripped and damaged bulbs were 1.3% (a moisture content of tops was 28.6% and a green tops ratio was 0.0%).<br>Through these experiments it was found that this topper could be used in practice between mid-September and early-October.

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