STUDY OF BRIGHTNESS REVERSION OF CMP PULPS OF HORN BEAM AND BEECH BY THERMAL AGING

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VAYSI R.; MIRSHOKRAEI SEYED AHMAD; KHADEMI ESLAM H.A.; HEMASI A.H.

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Journal: Year:2006 | Volume:11 | Issue:4 Page(s): 201-211

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Title

STUDY OF BRIGHTNESS REVERSION OF CMP PULPS OF HORN BEAM AND BEECH BY THERMAL AGING

Author(s)

VAYSI R. | MIRSHOKRAEI SEYED AHMAD | KHADEMI ESLAM H.A. | HEMASI A.H. | Issue Writer Certificate

Keywords

COLOR CHANGEQ2

OPTICAL PROPERTIESQ3

CMP PULPQ4

THERMAL AGINGQ4

BLEACHINGQ4

DTPA SPRAYQ4

HORN BEAMQ3

BEECHQ3

Abstract

In this study, chips from HORN BEAM and BEECH chips pile from Mazandaran Wood and Paper Industries were randomly chosen. Standard chips were separated and washed manually and CMP PULP from two species with 8S% yield was prepared. CMP PULPs were bleached separately with DTPA and without DTPA and with hydrogen peroxide. Some of the pulps were bleached with sodium ditionite and hand sheets with 60 gr/m2 gramage were prepared. Then DTPA (0.5%) was sprayed on the hand sheets and hand sheet OPTICAL PROPERTIES were measured by TAPPI standard methods. All the prepared papers went through THERMAL AGING, separately at 0, 10, 20, 30 and 40 hours at 105˚C in oven, and their OPTICAL PROPERTIES, including, their brightness, yellowness, K/S ratio, PC number and their a* factor before and after THERMAL AGING were measured and compared. The results of this study showed that, from 0 to 40 hours, the OPTICAL PROPERTIES of paper except brightness and greenness increased. This increase is more significant up to IS hours. Also, between different treatments, the DTPA treatment in long-term THERMAL AGING and the use of sodium ditionite and hydrogen peroxide in the short-term aging, have important influences on brightness durability and decrease in color reversion. As a result, there is an increase in paper durability against thermal deterioration. The HORN BEAM species is more appropriate than the BEECH species.

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APA: Copy

VAYSI, R., MIRSHOKRAEI, SEYED AHMAD, KHADEMI ESLAM, H.A., & HEMASI, A.H.. (2006). STUDY OF BRIGHTNESS REVERSION OF CMP PULPS OF HORN BEAM AND BEECH BY THERMAL AGING. JOURNAL OF AGRICULTURAL SCIENCES, 11(4), 201-211. SID. https://sid.ir/paper/408323/en

Vancouver: Copy

VAYSI R., MIRSHOKRAEI SEYED AHMAD, KHADEMI ESLAM H.A., HEMASI A.H.. STUDY OF BRIGHTNESS REVERSION OF CMP PULPS OF HORN BEAM AND BEECH BY THERMAL AGING. JOURNAL OF AGRICULTURAL SCIENCES[Internet]. 2006;11(4):201-211. Available from: https://sid.ir/paper/408323/en

IEEE: Copy

R. VAYSI, SEYED AHMAD MIRSHOKRAEI, H.A. KHADEMI ESLAM, and A.H. HEMASI, “STUDY OF BRIGHTNESS REVERSION OF CMP PULPS OF HORN BEAM AND BEECH BY THERMAL AGING,” JOURNAL OF AGRICULTURAL SCIENCES, vol. 11, no. 4, pp. 201–211, 2006, [Online]. Available: https://sid.ir/paper/408323/en

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