Poplar ASGW pulp new process

The present invention discloses an Italian poplar ASGW pulping process. It is characterized by that said process includes the following several steps: (1), sawing log and debarking; (2), coarse grinding by utilizing grindstone grinder and adding alkali; (3), fine grinding by using disc refiner and adding alkali and hydrogen peroxide; and (4), screening, purifying and bleaching. Besides, said invention also provides main technical parameters of said pulping process.

Pulping technology for deinked waste paper pulp used for making high-grade culture printing paper

The invention discloses pulping technology for a deinked waste paper pulp used for making high-grade culture printing paper. The pulping technology comprises the following processes of: (1) waste paper sorting and matching, (2) repulping, (3) screening and purification, (4) floatation and deinking, (5) heat dispersion, (6) bleaching, (7) loop water treatment, and (8) glue treatment. The deinked waste paper pulp used for making the high-grade culture printing paper has the characteristics of whiteness gain (percent ISO) of more than or equal to 20, glue removal rate of more than or equal to 98 percent, dust removal rate of more than or equal to 99.5 percent, totally combined ink content (ERIC) removal rate of more than or equal to 77 percent, cationic charge quantity demand PCD (ueq/l) of less than or equal to 300, and fiber yield of more than or equal to 70 percent, wherein important indicators such as the whiteness gain, the pulp dust removal rate, the glue removal rate, the PCD and the ...

Pulping technology for deinked waste paper pulp used for making high-grade culture printing paper

The invention discloses pulping technology for a deinked waste paper pulp used for making high-grade culture printing paper. The pulping technology comprises the following processes of: (1) waste paper sorting and matching, (2) repulping, (3) screening and purification, (4) floatation and deinking, (5) heat dispersion, (6) bleaching, (7) loop water treatment, and (8) glue treatment. The deinked waste paper pulp used for making the high-grade culture printing paper has the characteristics of whiteness gain (percent ISO) of more than or equal to 20, glue removal rate of more than or equal to 98percent, dust removal rate of more than or equal to 99.5 percent, totally combined ink content (ERIC) removal rate of more than or equal to 77 percent, cationic charge quantity demand PCD (ueq/l) of less than or equal to 300, and fiber yield of more than or equal to 70 percent, wherein important indicators such as the whiteness gain, the pulp dust removal rate, the glue removal rate, the PCD and the ...

Poplar ASGW pulping process