Document Type : Research Paper


1 Master science, Faculty of Forestry and Wood Technology, Agricultural and Resources University of Gorgan

2 Pulp and Paper Department, Faculty of Wood & Paper Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

3 Tarbiat Modares University

4 Master science, Faculty of Forestry and Wood Technology, Agricultural and Resources University of Tarbiat Modares , Noor.


This study has been performed in order to determination of optimum refining of paper made of recovered Kraft liner. Recovered Kraft liner has been prepared from anzali city. After shredding into 5 centimeter pieces, the papers were soaked in distillated water in pail. After 7 days fibers was separated of each other by disintegrator and freeness for each pulp before and after refining were measured. They were refined in revolutions of 3000, 6000, 9000, 12000 by PFI mill. Hand sheets were made from each revolution in order to TAPPI standard T 205om-95 number, and then were compared with control sample. Analysis of variance of waste papers were conducted using completely randomized design, then mean values were compared, using Duncan’s test, and finally the normalization equations were used to determine the best sample.  Results showed that increasing of refining revolution increased strength of burst, tensile and brightness but decrease freeness, thickness and tear strength at product. Normalization equations showed that the best papers made from refining revolution of 9000.


Main Subjects

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