The Effect of Using Cationic Starch and Bentonite on Physical and Mechanical Properties of Old Recycled Pulp

This study and it aim was accomplished on cationic starch and nano-clay(bentonite) on physical and mechanical properties of old recycled pulp. For this purpose, first some of old recycled pulp were randomly selected from Kaveh Industries in Saveh city as control. Then, nano-clay used in 0, 0.3 and 0.6 % levels. The cationic starch were added in 0, 1, 1.5 and 2 % levels and imported long fibers with 0 and 15 % levels to old recycled pulp suspensions. The hand sheets were prepared from above-mentioned of pulps with 140 gr/m2 basis weight and then the phesical and mechanical properties were measured and compared according to TAPPI standard test methods. The results showed that tear, tensile, burst strengths and ring crust test and corrugated medium test were increased and cobb 60 and thickness were decreased. The results showed that all physical and mechanical properties improved with 5% addition 15% imported long fiber. The results showed that using 2 cationic starch with 0.6 % nano-clay and 15% imported long fiber improved the most paper properties, too.