Substituting bleached CTMP (BCTMP) for chemical pulps, such as bleached hardwood kraft pulp in many paper grades is in rising demand for reducing cost and improving product performance. In this paper we investigated t...Substituting bleached CTMP (BCTMP) for chemical pulps, such as bleached hardwood kraft pulp in many paper grades is in rising demand for reducing cost and improving product performance. In this paper we investigated the effect of substituting aspen BCTMP for hardwood kraft pulp (varying from 10% to 30%) on product performance of light weight coated paper. The results show that the tensile index increases and other strength properties are essentially unchanged as the substitution level increases. With the increased BCTMP substitution level, the surface roughness of base sheets increases slightly, while coating coverage of base sheets is not affected significantly. The increased BCTMP substitution results in an increase in porosity of the base sheets, but does not change the average pore diameter. Increasing BCTMP substitution level leads to a slight decrease in gloss and an increase in surface roughness of the coated paper, however the latter can be compensated by a higher nip load calendering.展开更多
In this investigation, two different grades of birch chemical mechanical (P-RC APMP) pulps and aspen market bleached kraft pulp were compared by low consistency refining of the pulps separately and in different combin...In this investigation, two different grades of birch chemical mechanical (P-RC APMP) pulps and aspen market bleached kraft pulp were compared by low consistency refining of the pulps separately and in different combinations. In addition, the separately refined pulps were also combined to compare with the pulps from the co-refined pulp blend. The results showed that in both cases there were synergistic effects between the two types of pulps: adding the birch P-RC APMP pulp to the aspen kraft pulp improved pulp properties, and the resultant pulp blends had a higher fiber bonding strength (tensile and tensile energy absorption) than the sum of weighted contributions from the individual components. Understanding this synergistic effect between chemical mechanical (P-RC APMP) and kraft pulps can help to improve their applications and performances in various papermaking processes.The results also showed that introducing, at least up to certain percentage of, the birch P-RC APMP pulp into the aspen bleached kraft pulp not only improves optical and bulk properties, but also maintains or improves tensile strength, even though the P-RC APMP pulp used has lower tensile than the kraft pulp.展开更多
文摘Substituting bleached CTMP (BCTMP) for chemical pulps, such as bleached hardwood kraft pulp in many paper grades is in rising demand for reducing cost and improving product performance. In this paper we investigated the effect of substituting aspen BCTMP for hardwood kraft pulp (varying from 10% to 30%) on product performance of light weight coated paper. The results show that the tensile index increases and other strength properties are essentially unchanged as the substitution level increases. With the increased BCTMP substitution level, the surface roughness of base sheets increases slightly, while coating coverage of base sheets is not affected significantly. The increased BCTMP substitution results in an increase in porosity of the base sheets, but does not change the average pore diameter. Increasing BCTMP substitution level leads to a slight decrease in gloss and an increase in surface roughness of the coated paper, however the latter can be compensated by a higher nip load calendering.
文摘In this investigation, two different grades of birch chemical mechanical (P-RC APMP) pulps and aspen market bleached kraft pulp were compared by low consistency refining of the pulps separately and in different combinations. In addition, the separately refined pulps were also combined to compare with the pulps from the co-refined pulp blend. The results showed that in both cases there were synergistic effects between the two types of pulps: adding the birch P-RC APMP pulp to the aspen kraft pulp improved pulp properties, and the resultant pulp blends had a higher fiber bonding strength (tensile and tensile energy absorption) than the sum of weighted contributions from the individual components. Understanding this synergistic effect between chemical mechanical (P-RC APMP) and kraft pulps can help to improve their applications and performances in various papermaking processes.The results also showed that introducing, at least up to certain percentage of, the birch P-RC APMP pulp into the aspen bleached kraft pulp not only improves optical and bulk properties, but also maintains or improves tensile strength, even though the P-RC APMP pulp used has lower tensile than the kraft pulp.
