Study On The Co-refining Properties Of Bleached Wheat Straw Pulp And Aspen P-RC APMP

In order to reduce energy consumption, and make full use of fiber material, wheat straw pulp (WS) was co-refined with two kinds of P-RC APMP pulps separately, and their infulenc on optical and physical strength in different furnish and beating degree were studied, and meanwhile effects of co-refining on sizing, drainage and retention properties were also discussed preliminarily, the main results are described as follows:1. Co-refining of HB and WS can improve energy efficiency, and yield higher bulk and optical properties, and physical strength is also close to or even higher than WS at about 40oSR and 20% addition of HB pulp. What'more, obvious synergistic effects were found on improving bulk, tear and brittleness properties.2. P-RC APMP has better drainage and retention property than WS in the same condition, and the CSD could be decreased througth co-refining, especially HB pulp blends, and both the two kinds of P-RC APMP pulp blends can increase drainage property, and gain higer retention of fines than the corresponding P-RC APMP, and within 50% addition of P-RC APMP, the higher of its content, the better of the improvement, and HB pulp blends are more effective in this aspect than that of MB.3. P-RC APMP has higher sizing degree than WS in the same condition, and the two kinds of pulp blends also show lower Cobb value than WS, and the improvement is corresponding with the P-RC APMP content in the pulp blends, and the optimum dosage of AKD for the pulp blends is around 0.3%, and 0.04% for CPAM, 0.2% for bentonite, and pH value should controlled around 8.4. After the addition of wet end chemicals, HB pulp blends still show higher optical and bulk properties than MB pulp blends, and meanwhile the tensile, surface strength, tear, burst and retention of filler are also close to MB pulp blends at about 40oSR and 20% addition of P-RC APMP.