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U radu su istražene mogućnosti upotrebe stabljike biljaka Isatis tinctoria i Isatis buschiana kao sirovine za proizvodnju celuloze i papira. Određeni su kemijski sastav i morfološka svojstva stabljike. Sadržaj lignina u stabljici I. tinctoria bio je 23,9 %, a u stabljici I. buschiana 19,9 %. U stabljici I. tinctoria utvrđen je udjel alfa-celuloze od 48,5 %, a u stabljici I. buschiana taj je postotak iznosio 32,9 %. Izmjereni su duljina i promjer vlakanaca, promjer pore i debljina stanične stijenke, a dobiveni su podaci iskorišteni za izračunavanje brzine fi lcanja, koefi cijenta elastičnosti, koefi cijenta krutosti, Runkelova indeksa i F-faktora. Od stabljika biljaka Isatis tinctoria i Isatis buschiana proizvedeni su listovi papira kojima su zatim određena fizikalna i optička svojstva. Utvrđeno je da je veće vrijednosti duljine lomljenja, indeksa cijepanja i indeksa pucanja imao papir od mljevene celuloze nego papir od nemljevene celuloze, dok je papir od nemljevene celuloze imao veće vrijednosti sjajnosti i bjeline.
Isatis tinctoria and Isatis buschiana were evaluated as raw materials for pulp and paper production. Chemical composition and morphological aspects of Isatis stalks were determined. Lignin contents of I. tinctoria and I. buschiana were 23.9 % and 19.9 %, respectively. alfa-cellulose ratio was found to be 48.5 % in I. tinctoria and 32.9 % in I. buschiana. Fiber length, fiber diameter, lumen diameter and cell wall thickness were measured and the obtained data was used to calculate felting rate, elasticity coeffi cient, rigidity coefficient, runkel index and F factor. Handsheets were produced from Isatis stalks, and physical and optical properties were determined. Breaking length, tear index and burst index values were higher for the beaten pulp than for unbeaten pulp, while brightness and whiteness values were higher in unbeaten pulp.
I. tinctoria, paper, Forestry, SD1-669.5, pulp, celuloza, chemical composition, papir, I. buschiana, kemijski sastav
I. tinctoria, paper, Forestry, SD1-669.5, pulp, celuloza, chemical composition, papir, I. buschiana, kemijski sastav
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