جستجوی مقالات مرتبط با کلیدواژه "خمیرکاغذ بازیافتی" در نشریات گروه "صنایع چوب و کاغذ"

The strength properties of medium corrugated board which is made using recycled pulp are always important. The aim of this study was to investigate the effect of bulking agent’s addition and acetylated starch on the strength properties of corrugated board from neutral sulfite semi-chemical and old corrugated container pulp. For this purpose, the pulp was treated with two materials separately including tri (propylene glycol) butyl ether and di (propylene glycol) butyl ether bulking agents in the 0.9% dry weight of the pulp level. In addition, each of these bulking agents was added with acetylated starch (at the level of 4% of dry weight of the pulp) to the pulp suspension. The strengths properties of corrugated board were measured. The results showed that the corrugated board treated by tri (propylene glycol) butyl ether and di (propylene glycol) butyl ether bulking agents had the highest bulk and thickness in comparison to other samples. Also, the strength properties of samples decreased by adding bulking agents. Acetylated starch was used to improve the strengths of samples. Addition of acetylated starch with bulking agents improved the strengths of samples. Corrugated board with tri (propylene glycol) butyl ether and acetylated starch showed highest tensile, burst, tear strengths, stiffness, CMT and RCT. Results showed that the effect of different treatments is statistically significant in all trials.

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.