Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)
- Volume 31 Issue 5
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- Pages.18-23
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- 1999
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- 0253-3200(pISSN)
The Effects of Multiple Recycling on Deinkability, Optical and Physical Properties of Recycled Paper
- Shin, Jun-Seop (Dept. of Paper Technology , Yong-In Songdam College) ;
- Min, Choon-Ki (Dept. of Paper Technology , Yong-In Songdam College)
- Published : 1999.12.01
Abstract
This study examined the effects of multiple recycling on deinkability and properties of recycled paper from laser computer printout(LCPO). First, alkaline paper with a 20% printed area was disintegrated by TAPPI standard disintegrator. After dewatering , the pulp was followed by flotation, handsheet making, and drying at room temperature, in order. A sequence of printing , disintegrating, flotating , handsheet making and drying was one recycling cycle and this cyclic treatment was repeateed from zero to five times. The residual ink content in recycled handsheets by SEM-EDXA and Py-GC analyseswas increased slightly as recycling number increase. After five cycles of recycling the ISO brightness of recycled handsheets dropped to about 90% of the original brightness. However, it had a gain of 10% in opacity. The most of physical properties of recycled handsheets were decreased as recycling numbers increase except of for tear strength.
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