Correlation between Extractive Content and Colour Properties in Teak Heartwood
| Main Author: | Lukmandaru, Ganis |
|---|---|
| Other Authors: | Forest Product Research and Development Center, Pusat Penelitian dan Pengembangan Hasil Hutan |
| Format: | Article info application/pdf eJournal |
| Bahasa: | ind |
| Terbitan: |
Pusat Penelitian dan Pengembangan Hasil Hutan
, 2016
|
| Subjects: | |
| Online Access: |
http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/2292 http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/2292/1813 |
Daftar Isi:
- Beside for its high natural durability and resistancy of weather properties, teak (Tectona grandis) wood is also valued for its beautiful grain and colour. Theoretically, wood colour is highly affected by extractive content, particularly in the heartwood. Identification of correlation between wood colour and extractive content was determined through wood colour and extractive measurements on the outer part of heartwood zone. The wood samples were collected from two locations of Perum Perhutani forest plantations, i.e. KPH Randublatung (35 trees, age class III-IV) and KPH Purwakarta (32 trees, age class VI). Samples were cut from bottom part of the trees and then ground into powder measuring of 40-60 mesh. The wood colour properties(CIE-L*a*b, CIE-L*C*h, CIE-X*Y*Z, Munsell Colour Chart and ISO Brightness) were then measured. Solubility of the teak wood extractives were determined by extracting the powder in ethanol-benzene and hot water respectively. Results showed that the range of colour properties were L*= 40-62; a* = 3-11; b* = 19-31; C* = 20-31; h0= 70-82; X= 10-25; Y= 8-23; Z=4-13; H=5-8; V =3-8; C =3-6; and W (ISO Brightness) = 4-12. Different sample location resulted in different trends of correlation between colour properties and extractive contents. No significant correlation was found between extractive solubles in hot water and colour parameters. In general, the best correlations were encountered between brightness parameters from CIE-L*a*b* or ISO with ethanol- benzene extractive contents (r=- 0.54 or 0.50, respectively).
- Kayu jati (Tectona grandis) selain dikenal dengan keawetan alami dan ketahanan terhadap cuaca yang tinggi juga dihargai karena gambaran serat dan warna kayu yang bagus. Secara teoritis, warna kayu banyak dipengaruhi oleh kadar ekstraktif khususnya di bagian kayu terasnya. Dalam penelitian ini untuk memantapkan korelasi antara warna kayu dan kadar ekstraktif, penentuan dengan berbagai metode pengukuran warna dilakukan pada bagian teras terluar. Sampel kayu diambil dari bagian pangkal pohon dari dua lokasi hutan tanaman Perum Perhutani, yaitu KPH Randublatung (35 pohon, kelas umur III-IV) dan KPH Purwakarta (32 pohon, kelas umur VI). Dengan serbuk ukuran 40-60 mesh, kemudian diukur sifat warna (CIE-L*a*b, CIE-L*C*h, CIE-X*Y*Z, Munsell Color Chart, dan kecerahan ISO) dan kadar ekstraktifnya (etanol-benzena, air panas, dan total). Nilai rerata kadar ekstraktif etanol benzena (10,80 %) dan total (12,62 %) serta koefisien variasi (26,3 %) pada jati dari Purwakarta lebih tinggi dibandingkan jati dari Randublatung. Kisaran sifat warna yang diperoleh adalah L* = 40-62 a* =; 3-11; b* = 19-31; C* = 20-31; h0 = 70-82; X = 10-25; = Y 8-23; Z = 4-13; H = 5-8; V = 3-8; C = 3-6; dan W (ISO brightness) = 4-12. Lokasi yang berbeda memberikan kecenderungan yang berbeda pada korelasi sifat warna dan kadar ekstraktifnya. Tidak ada korelasi nyata antara kelarutan dalam air panas dengan parameter warna. Secara keseluruhan, parameter kecerahan (L*) dari CIE-L*a*b* dan dari ISO (W) memberikan korelasi terbaik dengan kadar ekstraktif etanol-benzena (r = -0,54 dan 0,50 secara berturutan).