The mechanical and chemical effect on the pulping properties of the old newsprint was studied using a FORMAX Micro-Maelstrom Laboratory Pulper, and the flotation conditions such as velocity of air flow, air pressure a...The mechanical and chemical effect on the pulping properties of the old newsprint was studied using a FORMAX Micro-Maelstrom Laboratory Pulper, and the flotation conditions such as velocity of air flow, air pressure and flotation time were also discussed with a FORMAX Deink Cell. The results show that sodium hydroxide, sodium silicate, hydrogen peroxide and deinking agent are the key factors in the chemical effect, and pulping consistency is more important than pulping time and rotation speed in the mechanical effect during the high consistency pulping of the ONP. In general, the chemical effect has a greater influence on the deinked pulp properties than the mechanical effect.展开更多
Three kinds of cellulases with different components were applied to the deinking of mixed office waste paper, MOW. In the process of enzymatic deinking of MOW, not only improvement of toner particle removal was achiev...Three kinds of cellulases with different components were applied to the deinking of mixed office waste paper, MOW. In the process of enzymatic deinking of MOW, not only improvement of toner particle removal was achieved with the addition of enzymes but other properties of the deinked pulps were influenced. Drainage properties of the deinked pulp were improved after treated with enzymes. Higher enzyme dosage was needed compared with that only for deinking purpose if obvious drainage improvement of the deinked pulp were to be achieved. The enzymatic hydrolysis of fibers did not lead to distinct fiber length decrease, but declined the zero tensile strength of the pulp declined with addition of enzymes, which indicating the decrease of individual fiber strength. In addition, enzyme treatment resulted in the enhancement of specific surface area of fibers.展开更多
文摘The mechanical and chemical effect on the pulping properties of the old newsprint was studied using a FORMAX Micro-Maelstrom Laboratory Pulper, and the flotation conditions such as velocity of air flow, air pressure and flotation time were also discussed with a FORMAX Deink Cell. The results show that sodium hydroxide, sodium silicate, hydrogen peroxide and deinking agent are the key factors in the chemical effect, and pulping consistency is more important than pulping time and rotation speed in the mechanical effect during the high consistency pulping of the ONP. In general, the chemical effect has a greater influence on the deinked pulp properties than the mechanical effect.
文摘Three kinds of cellulases with different components were applied to the deinking of mixed office waste paper, MOW. In the process of enzymatic deinking of MOW, not only improvement of toner particle removal was achieved with the addition of enzymes but other properties of the deinked pulps were influenced. Drainage properties of the deinked pulp were improved after treated with enzymes. Higher enzyme dosage was needed compared with that only for deinking purpose if obvious drainage improvement of the deinked pulp were to be achieved. The enzymatic hydrolysis of fibers did not lead to distinct fiber length decrease, but declined the zero tensile strength of the pulp declined with addition of enzymes, which indicating the decrease of individual fiber strength. In addition, enzyme treatment resulted in the enhancement of specific surface area of fibers.
