SILPAKORN UNIVERSITY JOURNAL OF SOCIAL SCIENCES, HUMANITIES, AND ARTS, Vol. 3 (Number 1-2) 2003

Vibration-Assisted Tight-Filling Machine for Tangerine

Bundit Jarimopas, Preecha Thairat, Pictiaw Chen








Abstract


This research was to test and evaluate the vibration-assisted
tight-filling machine (VATFM). Both engineering and economical
aspects were considered. The machine comprised three parts, i.e.,
feeder and weighter (550 mm wide by 750 mm long by 350 mm
high), controller and vibrator (410 mm wide by 580 mm long by
315 mm high).

Tests were conducted with constant amplitude (6 mm) and
constant duration of 5 seconds of vibration. Control factors of
vibration included 4 frequencies and 5 fruit packing methods. Two
sizes of tangerine (no.2 and 00) and 2 replications were used for
each combination of the control factors. Two vibrational
properties, i.e., settling index (Hm) and damage percentage were
investigated.

Results showed vibration with constant 8.7 Hz frequency and
vertical pressure of 478.7 N/m2 was suitable for the tested
tangerines. Corresponding packing error and fruit damage were less
than 0.5 and 0.9%, respectively. Packing rates for tangerine no. 2
and 00 were 463.8 and 538.8 kg/hr.

After vibration there was some space available at the top of
package due to fruit settling. The packages of tangerine no.2 and
00 could be filled up with additional fruits of 3.49 and 2.55 kg/
package, respectively. Economic analysis indicated that the VATFM
had the break even point at 13,040 packages and pay back period
of 77 days.

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