In this study, 5, 10, and 15 % secondary fines of recycled pulp were added to unbeaten and beaten (28 ºSR) samples of recycled pulp, Turkish Calabrian pine (Pinus brutia Ten.) kraft pulp, and European aspen (Populus tremula L.) kraft pulp. The effects of the addition of fiber fines on hand sheets properties were evaluated. The addition of fiber fines to the unbeaten pulps improved the strength properties of hand sheets. The roughness of hand sheets was also decreased with the addition of fines. When fiber fines were added to the beaten pulps, the type of pulp strongly affected the paper strength properties. The strength properties of beaten pulps of Turkish Calabrian pine and European aspen were decreased with the addition of fiber fines, while the strength properties of beaten pulps of recycled pulp were increased. On the other hand, the air permeance of unbeaten and beaten samples was decreased with the addition of fiber fines. Consequently, the addition of fines to unbeaten and beaten pulps had a more pronounced effect on European aspen kraft pulp and recycled pulp than on Turkish Calabrian pine kraft pulp. Also, the strength of paper made of unbeaten recycled pulp with the addition of 15 % fines was higher than that of fines-free beaten recycled pulp.; U radu je opisano istraživanje u kojemu je mljevenoj i nemljevenoj (28 °SR) recikliranoj celulozi, kraft celulozi od brucijskog bora (Pinus brutia Ten.) i kraf celulozi od jasike (Populus tremula L.) dodano 5, 10 i 15 % sekundarnih finih vlakana reciklirane celuloze. Utvrđeni su učinci dodavanja finih vlakana na svojstva ručno izrađenih papira. Dodatak vlakana nemljevenoj celulozi pridonio je povećanju čvrstoće i smanjenju hrapavosti ručno izrađenih papira. Pri dodavanju vlakana mljevenoj celulozi velik je utjecaj na čvrstoću papira imala vrsta celuloze. Čvrstoća mljevene celuloze od brucijskog bora i jasike dodatkom vlakana se smanjila, dok se čvrstoća mljevene reciklirane celuloze povećala. Usto, dodatkom vlakana smanjena je propusnost zraka mljevenih i nemljevenih uzoraka. Posljedično, učinak dodavanja vlakana mljevenoj i nemljevenoj celulozi bio je veći za kraft celulozu od jasike i recikliranu celulozu nego za kraft celulozu od brucijskog bora. Također, čvrstoća papira od mljevene reciklirane celuloze s dodatkom 15 % vlakana bila je veća od čvrstoće papira od mljevene celuloze bez dodatka vlakana.