1h and MOR. The quality improvement of Maesopsis eminii Engl wood was indicated by increasing of wood density from 0.39 g/cm·' to 0.43 g/cm3 , MOE from 56,387._,72 kg/cm2 to 57,084.00 kg/cm2 and MOR from 462.57 kg/cm2 to 495.00 kg/cm????. "> 1h and MOR. The quality improvement of Maesopsis eminii Engl wood was indicated by increasing of wood density from 0.39 g/cm·' to 0.43 g/cm3 , MOE from 56,387._,72 kg/cm2 to 57,084.00 kg/cm2 and MOR from 462.57 kg/cm2 to 495.00 kg/cm????. ">
PENINGKATAN KUALITAS KAYU Maesopsis eminii Engl MELALUI TEKNOLOGI PEREKATAN BERUPA KOMBINASI PERLAKliAN NISBAH MOL KOMPONEN PEREKAT BERBAHAN DASAR LIGNIN DAN WAKTU KEMPA DALAM PEMBUATAN KAYU LAMINA
Bagus Novianto, Prof.Dr.Ir. T.A. Prayitno, MF
2001 | Tesis | S2 Ilmu KehutananTeknologi perekatan kayu nerupakan salah satu teknolog, yang berperan dalarn peningkatan sifat pennukaan kayu dan perbaikan sifat fisik dan mekanik kayu. '1eberapa factor yang berpengaruh dalam teknologi perekatan kayu adalah jenis perekat, nisbal1 mol dan waktu kempa. Penelitian ini bertujuan untuk mengetahui pengarnh nisbah rnol komponen perekat berbahan dasar lignin dan waktu kempa dalarn pernbuatan kayu lwnina Maesopsis eminii Engl. Perekat berbahan dasar lignin dibuat dari lignin, resorsinol dan fonnaldehida. Perekat tersebqt diteliti secara kuantitatif yang meliputi kandungan lignin, kadar abu, keasaman lignin , kadar metoksil berdasarkan metode ASTM ( 1970), penetapan bobot ekuivalen dengan metode Beckman ( 1990), dan kadar lignin murni dengan metode Browning ( 1967). Untuk kualitas kayu, yang diteliti meliputi kadar air, kerapatan, keteguhan geser (kondisi kering dan basah), M0E dan MOR kayu lamina. Hasil penelitian menunjukkan bahwa penambahan nisbah mol resorsinol ke dalam komponen perekat berbahan dasar lignin berpengaruh positif terhadap karakteristik lignin yaitu menyebabkan reaksi kondensasi antara lignin, resorsinol dan fonnaldehjda berlangsung semakin sempuma sehingga tercipta ketegu11an rekat yang lebih baik. Rata- rata kadar padatan tertinggi sebesar 52,78%, pH 9 ,85 dan viskositas 1,2 poise diperoleh pada penambahan resorsinol sebesar 0,9 mol. lnteraksi amara nisbah mol dan waktu kempa diperoleh hanya pada kadar aii dan MOR. Kadar air terendah diperoleh pada nisbah mo! resorsinol sebesar 0,5 dan waktu kempa 6 jam, sedangkan MOR tertinggi dipero1eh pada nisbah mol resorsino1 0,9 dan waktu kempa 12 jam. Faktor ttmggal nisbah mol berpengaruh nyata terhadap kadar air, kerapatan, keteguhan geser kering dan basah, MOE dan MOR kayu lamina. FaLtor tunggal waktu kempa berpengaruh nyata terhadap kadar air, keteguhan geser kering dan MOR. Peningkatan kualitas kayu Maesopsis eminii Engl dapat dilihat dari meningkatnya kerapatan kayu lamina dari 0,39 g/cm3 ke 0,43 g/cm3, MOE dari 56.387,72 kg/cm" ke 57.084 kg/cm2 dan MOR dari 462,57 kg/cm2 ke 495 ,42 kg/cm2.
The wood adhesion tel hnology is one of technology which has an important role in increasing the quality of wood surface and improving physic:-il and mechanical wood. Some factors atfectmg the a 1hesion technology are adhesive type, mole ratio and pressing time. For that reason the objective of this research is to study the effect of mole ratio and pressing time of the lignin based adhesive quality on Maesopsis eminii Engl wood. Lignin based adhesive wa; made of lignin, resorsinol, and fon11aldehyde. It was quantitatively analyzed on lignin contents, methoxyl contents, hgnin acidity, and ash contents according to ASTM method ( 1970), equivalent weight by Beckman method (1990), and pure lignin contents by Browning ( 1967).The wood adhesion quality of laminated timber was tested in tenn of moisture contents (MC), density, dry and wet shear strength, MOE and MOR. The result showed that the addition of resorcinol produced a better condensation products.The average of solid contents of 52.70%, pH 9.85 and viscosity 1.2 poise was obtained by 0,9 mole resorcinol addition. The interaction was detected only on MC and MOR. The lowest MC was produced by combination of 0.5 mole resorcinol and 6 hours pressing time, the highest MOR was produced by 0.9 mole resorcinol and 12 hours pressing time. The single factor of mo1e ratio effect was significantly on MC, density, dry and wet shear strength, MOE and MOR. The pressing time factor affected significantly on MC, dry shear stren1:,>1h and MOR. The quality improvement of Maesopsis eminii Engl wood was indicated by increasing of wood density from 0.39 g/cm·' to 0.43 g/cm3 , MOE from 56,387._,72 kg/cm2 to 57,084.00 kg/cm2 and MOR from 462.57 kg/cm2 to 495.00 kg/cm????.
Kata Kunci : Kayu,Perekatan,Nisbah Mol dan Waktu Kempa