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Abstract

The experiment of papermaking from bleached ramie fiber has been conducted on a laboratory scale, with a variation of the composition of mixture 10–30% of ramie pulp and 90%-70 % LBKP, with the addition of 15 - 20% filler, 0,6% sizing agent and 1% dry strength. Hand sheet of 80 g/m 2 grammage were made and the optical and physical properties including brigthness, opacity, tensile strength, tear strength, bursting strength, roughness and water absorption tested. The result showed that as ramie fiber content increased in the sheet, the opacity, roughness, strength and water absorption also increased, meanwhile the brightness and porocity decreased. As filler content were increased, brigthness, opacity, porosity and water absorption of hand sheet also increased, meanwihle paper strength decreased.

Key words : ramie, pulp, kraft, paper.

INTISARI

Penelitian pembuatan kertas dari pulp rami putih telah dilakukan pada skala laboratorium, dengan variasi komposisi campuran pulp rami 10 % - 30% dan pulp LBKP 90% - 70%, dengan penambahan bahan pengisi 15% - 20%, zat darih 0,6% serta penguat kering 1%. Stok dibentuk menjadi lembaran dengan gramatur 80 g/m 2 dan diuji sifat optik dan sifat fisik yang meliputi derajat putih, opasitas, ketahanan tarik, ketahanan sobek, ketahanan retak, kekasaran, porositas, dan daya serap air. Hasil percobaan menunjukkan bahwa semakin tinggi kandungan serat rami pada lembaran maka nilai opasitas, kekasaran, kekuatan dan daya serap air semakin tinggi, sedangkan nilai derajat putih dan porositas menurun. Semakin tinggi bahan pengisi, maka semakin tinggi nilai derajat putih, opasitas, porositas dan daya serap air lembaran, sedangkan nilai kekuatan kertas menurun.

Kata kunci : rami, pulp, kraft, kertas.