Drying characteristics of pandan (Pandanus simplex Merr.) leaves using the DOST-FPRDI [Department of Science and Technology-Forest Products Research and Development Institute] furnace-type dryer
2023
Jimenez, J.P. Jr
This study investigated the drying characteristics of pandan (Pandanus simplex Merr.) leaves using the DOST-FPRDI's furnace-type dryer to provide an efficient drying solution. Two trial runs were conducted with different kiln drying settings. During the first trial run, narrow (6, 8, and 14 mm) pandan leaf strips with initial moisture content (MC) values ranging from 105145% achieved an MC below 20% within 1 h. Conversely, wider leaf strips (17 and 21 mm) required a longer drying duration of approximately 4 h to reach the desired MC level. In the second trial run, with higher temperature setting, again the narrow leaf strips with initial MC ranging from 123 to 136% attained an MC below 20% within 1 h, whereas the wider ones took just 2 h to dry below 20%. Two verification runs were conducted to validate the effectiveness of the second trial run. Leaf strips of various sizes demonstrated improved drying times, with the desired MC achieved within half an hour to 1.5 h. The absorption rate of pandan leaf samples was also examined, revealing their ability to absorb moisture from the air. Within a day, the samples absorbed more than 5% moisture, highlighting the importance of not drying the leaves below the prevailing equilibrium MC of the environment. This research provides valuable insights into the drying process of pandan leaves by reducing drying time and improving the overall quality of dried leaves.
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