γ-射線照射對文化用紙光學性質的影響

Effects of Gamma Ray Irradiation on Optical Properties of Printing and Writing Paper

蘇裕昌(Yu-Chang Su) ； 趙國評(Kuo-Ping Chao) ； 陳鴻財(Horng-Tsai Chen) ； 陳家傑(Chia-Chieh Chen)

《台灣林業科學》 14卷1期 (1999/03) Pp. 37-44

https://doi.org/10.7075/TJFS.199903.0037

摘要

Effects of Gamma Ray Irradiation on Optical Properties of Printing and Writing Paper γ-Rays used as a sterilization method for paper always cause degradation of main components such as cellulose and hemicellulose. This report elucidates the effects of γ-ray irradiation on optical properties (brightness, color difference, etc.) and examines the feasibility of γ-ray irradiation for sterilization at different dosages. The results obtained can be used for establishing a proper sterilization method for paper. FT-IR spectrum analyses were also conducted and the results used for understanding color degradation of paper. Gamma-ray irradiation at dosages above 2.5 Mrad gave 100% sterilization, and 2.5 Mrad seems to be a proper dosage for sterilization of paper. No significant resultant changes in optical properties of the paper were shown at low (＜1 Mrad) and medium (1.0-2.5 Mrad) dosages of γ-ray irradiation. At high dosages (＞2.5 Mrad) of irradiation, the resulting paper showed significant decreases in brightness, increases in yellowness, and greater color differences. Conditions excluding light and air during irradiation influenced the optical properties of the resulting paper. The presence of air affects the properties more than that of light. FT-IR spectrum analyses showed that a new adsorption band was formed near 1720cm^(-1). This reveals the formation of functional groups in irradiated paper, and they are assumed to be carboxyl, aldehyde, or ketone groups. Formation of functional groups is responsible for the discoloration of the irradiated paper. The higher the dosage of irradiation, the higher the amounts of functional groups formed.

關鍵字

γ-射線照射 ； FT-IR圖譜 ； 紙張性質 ； 光學性質

並列摘要

Effects of Gamma Ray Irradiation on Optical Properties of Printing and Writing Paper γ-Rays used as a sterilization method for paper always cause degradation of main components such as cellulose and hemicellulose. This report elucidates the effects of γ-ray irradiation on optical properties (brightness, color difference, etc.) and examines the feasibility of γ-ray irradiation for sterilization at different dosages. The results obtained can be used for establishing a proper sterilization method for paper. FT-IR spectrum analyses were also conducted and the results used for understanding color degradation of paper. Gamma-ray irradiation at dosages above 2.5 Mrad gave 100% sterilization, and 2.5 Mrad seems to be a proper dosage for sterilization of paper. No significant resultant changes in optical properties of the paper were shown at low (＜1 Mrad) and medium (1.0-2.5 Mrad) dosages of γ-ray irradiation. At high dosages (＞2.5 Mrad) of irradiation, the resulting paper showed significant decreases in brightness, increases in yellowness, and greater color differences. Conditions excluding light and air during irradiation influenced the optical properties of the resulting paper. The presence of air affects the properties more than that of light. FT-IR spectrum analyses showed that a new adsorption band was formed near 1720cm^(-1). This reveals the formation of functional groups in irradiated paper, and they are assumed to be carboxyl, aldehyde, or ketone groups. Formation of functional groups is responsible for the discoloration of the irradiated paper. The higher the dosage of irradiation, the higher the amounts of functional groups formed.

並列關鍵字

γ-ray irradiation ； FT-IR spectrum ； paper properties ； optical properties