บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Tomato packing lines studies with an instrumented sphere in brazil.

Ferreira M.K., Ferraz A.C.O., Franco A.T.O.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004 Page 20

2004

บทคัดย่อ

Tomato packing lines studies with an instrumented sphere in brazil.    Tomatoes for fresh market in Brazil were mainly classified and sorted by hand in field conditions.In the past five years many growers started to do those operations in packinghouses using machines.The goal of this research was to determine the levels a frequency of occurrence of impacts in commercial tomato packing lines in Brazil.

This research analyzed eight packing lines in Sao Paulo state, using the instrumented sphere (IS) Techmark, Inc., Lansing, 70 mm in diameter.The IS can measure and impact intensities at each of the transfer points. Impacts are measured as maximum acceleration (MA) in G (Gravity=9.81 ms-2) and velocity change (VC) in m s-1.To analyse those packinghouses, the IS was placed o­n the top of plastic boxes.Subsequent transfer points o­n the packing line were sequentially measured until packing was finished.The IS was carried with the fruit over o­ne or more transfer points while the elapsed time was recorded at each point using a stopwatch.Each transfer point was replicated 8 times, then the IS was removed from the packing line and the data was transferred to a portable computer.The threshold o­n the IS was set to record impacts from 15 to 500G.Means of the 8 maximum levels were determined for each transfer point (MA and VC) since these parameters most accurately describe impact intensities.Scatter plots of MA versus VC were made for all impacts recorded for each handling operation.

For the all the packing lines the highest G were found in the initial operations, when the operators dropped the boxes in the packing line, and in some cases get above 300 G.Most of the packing lines showed to have impacts in some transfer points above 100 G.Transfer points with greatest potential for causing damage were those with high drop heights.