Study for Prevention of Photo Yellowing Occurring at TMP

Ji-Young Lee; Sol Kwon; Min-Seok Lee; Jeong-Min Seo; Jeong-Suk Lee; Chul-Hwan Kim

doi:10.7584/JKTAPPI.2016.08.48.4.24

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Study for Prevention of Photo Yellowing Occurring at TMP 열기계 펄프의 황변 현상 방지 연구

30 August 2016. pp. 24-31

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Abstract

Light-induced yellowing of mechanical pulps proceeds through photooxidative discoloration of lignin in fibers. Lignin absorbs near UV light, which creates short-lived, high-energy excited molecules generating free radicals. Free radicals reacts in the presence of oxygen to form yellow chromophores. Several different strategies have been applied to inhibit photoyellowing of thermomechanical pulps (TMP). Even though the initial brightness of TMP bleached by sodium borohydride was lower than that of TMP done by hydrogen peroxide, sodium borohydride decreased the rate of photoyellowing more than did hydrogen peroxide. UV-light absorbers treated on BTMP adsorbed UV radiation more strongly than untreated pulp. Hardwood bleached kraft pulp (Hw-BKP) mixed with BTMP contributed to the decrease in the rate of photoyellowing. When oxidized starch adding UV absorbers coated paper containing BTMP, the UV absorbers had a meaningful effect on the inhibition of photoyellowing.

Keywords

Thermomechanical pulp

discoloration

TMP

photoyellowing

UV absorber

References

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 48
No :4
Pages :24-31
Received Date : 2016-07-25
Revised Date : 2016-08-04
Accepted Date : 2016-08-06
DOI :https://doi.org/10.7584/JKTAPPI.2016.08.48.4.24

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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Literature Cited