HIGH TEMPERATURE DRYING PROPERTIES AND BASIC DRYING SCHEDULE OF 5 LESSER-KNOWN SPECIES FROM RIAU
Abstrak: Drying process is a
crucial stage in the utilization of any wood for construction and furniture
purposes. The study aimed to: (i) investigate the sensitivity of severallesser-known
wood species from natural forest in Riau to drying process at hightemperature;
and (ii) develop basic drying schedule for each wood. Five lesser-knownspecies
from Riau were investigated, namely punak (Tetramerista glabra), mempisang(Diospyros
korthalsiana), pasak linggo (Aglaia argentea), meranti bunga (Shorea teysmanniana)
and suntai (Palaquiumburckii). Modified Terazawa’s (1965) methodwas used for
the experiment. The result shows that deformation was found for allspecies. The
most severe deformation level was observed for both punak (score value of 4-6)
and mempisang (score value of 4-5). On the other hand, pasaklinggo experienced
the most severe initial end/surface check/split (score value of 6) andhoneycombing
(score value of 5). The result also showed that punak and pasaklinggo can be
dried with the same drying schedule at the temperature range of 40-65° C and the
humidity range of 38-88%. The proposed temperature and humidity ranges (or drying
schedules) are 50-80° C and 28-80% for suntai, 50-70° C and 25-80% for mempisang,
and 50-70° C and 40-84% for meranti bunga. Mempisang and suntai can use the
same drying condition until fiber saturation point, then different drying condition
applies.
Keywords: Lesser known species,
Drying defect, Deformation, Drying schedule
Penulis: Karnita Yuniarti dan Efrida Basri
Kode Jurnal: jpkehutanandd170185
