Traditional Chinese Papers, their Properties and permanence
| Main Authors: | , , |
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/res_3_03_135_144.doc |
| Abstract: | SUMARRIES. Seven kinds of traditional Chinese paper made recently, i.e. three types of xuan paper, daqian writing paper, fuyangxuan paper and wenzhou bast paper, were selected to investigate their strength and durability after accelerated ageing. The effect of jiaofanshui (animal glue with alum) as an acidic sizing agent was also studied. Xuan paper and daqian writing paper have higher pH values, and a relatively high ash content, which consisted of mainly Ca and Si. The deterioration rate of their strength was lower. Xuan paper that is made using some of the traditional methods showed high buffering capacity towards the acidic sizing agent. Fuyangxuan paper and wenzhou bast paper, which were cooked and bleached using chemical agents in the same way as chemical wood pulp, had a higher cellulose content, but their DP decreased very fast during ageing. Therefore the deterioration rate of their strength was high. Fuyangxuan paper also had a relatively high degree of oxidation. CONCLUSION. By measuring the physical strength of paper samples and calculating their deterioration during accelerated ageing it became clear that the xuan paper and daqian writing paper had better permanence than the fuyangxuan paper and wenzhou bast paper. Fuyangxuan paper and wenzhou bast paper, which are submitted to nearly the same pulping and bleaching processes as modern paper made from chemical pulp, have similar properties: low pH, low ash content and high cellulose content but have more susceptibility to depolymerization after ageing. On the other hand, xuan paper and daqian writing paper, which are produced still using some of the original cooking and bleaching methods, have a higher ash content, higher pH and buffering capacity towards an acidic sizing agent. Considering the papermaking materials, mulberry bark usually results in better paper permanence than rice straw. However, the main conclusion we can draw from our tests is that, to obtain permanent durable paper, the production method is as important as the raw materials. |
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| ISSN: | ISSN 0034-5806 |
