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Permanence of wood-free paper I: Paper-making additives in naturally degraded wood-free papers

Abstract

Effects of pH, sizing agent, and starch on the natural deterioration of 45 printed wood-free papers stored 1–32 years was investigated in terms of MIT folding endurance, brightness, and L*a*b* values. The neutral and alkaline papers retained their folding endurances well and significantly lost their yellow color (b*) during storage. The folding endurance of the acidic papers stored more than 15 years showed a declining trend with increased storage time. The sizing agent content in the papers stored more than 10 years increased and the amount of starch decreased with increasing storage years. A larger amount of the sizing agents correlated with less folding endurance and more yellow color of the papers. The relation between the starch content and the degree of yellow color of the papers was unclear, and the endurance of the papers increased with the increase in starch content.

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Correspondence to Zonghua Wu.

Additional information

Part of this paper was presented at the 47th Annual Meeting of the Japan Wood Research Society in Kochi, April 1997

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Wu, Z., Tanaka, H. Permanence of wood-free paper I: Paper-making additives in naturally degraded wood-free papers. J Wood Sci 44, 111–115 (1998). https://doi.org/10.1007/BF00526255

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Key words

  • Wood-free papers
  • Permanence
  • MIT folding endurance
  • Sizing agents
  • Paper additives