| 发明名称 |
METHOD FOR IMPROVING QUALITY OF DEINKED HIGH GRADE WASTE PAPER |
| 摘要 |
<p>Quality of deinked/bleached high grade waste paper is improved by bleaching the deinked pulp with thiourea dioxide, said deinked pulp having been obtained by subjecting high grade waste paper to a digesting and aging step with a sulfite, alkali or alkaline peroxide, a disaggregation step, a deinking step and a dust removing step. - 1 7</p> |
| 申请公布号 |
CA2098144(A1) |
申请公布日期 |
1993.12.16 |
| 申请号 |
CA19932098144 |
申请日期 |
1993.06.10 |
| 申请人 |
TOKAI DENKA KOGYO KABUSHIKI KAISHA |
发明人 |
ITANI, KATSUTOSHI;FUKASAWA, TSUNEO;HARAGA, HIROYUKI |
| 分类号 |
D21C5/02;D21C9/10;(IPC1-7):D21C9/10 |
主分类号 |
D21C5/02 |
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