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Both Edgeworthia and Wikstroemia have been used traditionally in hand papermaking in China. As plants from the Thymelaeaceae family, these species have been mentioned periodically and have been mixed or substituted with each other. This study reviewed their papermaking background and status, and selected one of the Edgeworthia and three of the Wikstroemia raw materials that are still in use. Pulp was cooked under the same conditions in the laboratory, and handsheets of pure and mixed materials were obtained using a Rapid-Köthen sheet former. A series of physical properties, such as color, structure, and mechanical properties were tested, followed by a comparison and discussion of the raw material properties. The results show that Wikstroemia fibers are generally thinner and shorter, but there are variations between the different genera of raw materials. Thus, compared with Edgeworthia, Wikstroemia has some advantages in tensile strength, although it shows some disadvantages when it comes to tearing strength. The performance of a mixed-ingredient paper sheet falls between the performance of two pure-component papers. For cost and performance reasons, adding a small amount of Wikstroemia (e.g., <20%) to Edgeworthia is preferable.


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Comparative Study on the Physical Properties of Edgeworthia and Wikstroemia Handmade Paper

Show Author's information Ruxuan ZhaoGang Chen( )
Department of Cultural Heritage and Museology, Fudan University, Shanghai, 200433, China

Abstract

Both Edgeworthia and Wikstroemia have been used traditionally in hand papermaking in China. As plants from the Thymelaeaceae family, these species have been mentioned periodically and have been mixed or substituted with each other. This study reviewed their papermaking background and status, and selected one of the Edgeworthia and three of the Wikstroemia raw materials that are still in use. Pulp was cooked under the same conditions in the laboratory, and handsheets of pure and mixed materials were obtained using a Rapid-Köthen sheet former. A series of physical properties, such as color, structure, and mechanical properties were tested, followed by a comparison and discussion of the raw material properties. The results show that Wikstroemia fibers are generally thinner and shorter, but there are variations between the different genera of raw materials. Thus, compared with Edgeworthia, Wikstroemia has some advantages in tensile strength, although it shows some disadvantages when it comes to tearing strength. The performance of a mixed-ingredient paper sheet falls between the performance of two pure-component papers. For cost and performance reasons, adding a small amount of Wikstroemia (e.g., <20%) to Edgeworthia is preferable.

Keywords: handmade paper, paper properties, Edgeworthia, Wikstroemia, mixed-ingredient paper

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Publication history

Received: 29 May 2023
Accepted: 06 July 2023
Published: 25 July 2023
Issue date: July 2023

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© 2023 Published by Paper and Biomaterials Editorial Board.

Acknowledgements

This research is supported by the National Key R&D Program of China (2019YFC1520300).

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The articles published in this open access journal are distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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