New PDF release: Advances in Recycling and Deinking
By Pira International Ltd
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Additional info for Advances in Recycling and Deinking
The influences of repeated drying and reslushing depended on the yield of pulps and wood species. TMP and CTMP spruce pulps showed some increase in sheet density and tensile strength. Recycling of CMP exhibited a decrease of 15% in density and 30% in tensile strength. When the raw material was aspen, CTMP already showed a declining tendency in those properties. These results indicate that the CMP suffered noticeable reduction of bonding potential in the recycling process, but mildly treated CTMP suffered hardly at all.
995 times the density of water. The high-volume reject flow from the cleaner, which carries the lightweight contaminants in very dilute form, is treated in a new through-flow cleaner. It is optimised to operate at the unusually low consistency of this stream. A stream of low-volume rejects takes the contaminants out of the system. The latest DIP lines combine kneading, soaking and flotation and typically have two process loops and three water loops (Darrin Rhodes, 1998). Some mills have installed dispersion in the second loop, with and without washing, and other mills are using the wet-lap machine to wash out ink and stickies that have been dispersed.
Compared with CTMP, the CMP process had stronger sodium sulphite liquor, higher temperature and longer treatment time; it gave yields of 85% for spruce CMP and 80% for aspen CMP. Spruce and aspen CTMP had yields of 92% and 90%, respectively. The influences of repeated drying and reslushing depended on the yield of pulps and wood species. TMP and CTMP spruce pulps showed some increase in sheet density and tensile strength. Recycling of CMP exhibited a decrease of 15% in density and 30% in tensile strength.
Advances in Recycling and Deinking by Pira International Ltd