Supercritical dewatering and drying method for small water-saturated bamboo and wood articles

Abstract

The invention relates to a supercritical dewatering and drying method for small water-saturated bamboo and wood articles, belonging to the technical field of dewatering protection for cultural relics. The small water-saturated bamboo and wood articles of which the length, the width and the height are respectively at most 20cm are respectively soaked for certain time in three kinds of ethanol with different concentrations, then the supercritical drying method is adopted, and therefore the water of the water-saturated bamboo and wood articles is gradually replaced to achieve the purpose of dewatering. Compared with the prior art, the supercritical dewatering and drying method has the advantages that the purpose of dewatering of the water-saturated bamboo and wood articles can be achieved without filling chemical materials; the dewatered bamboo and wood articles have clear wood grains, and the color tends to be normal; the dewatered bamboo and wood articles have good stability under the condition of temperature and humidity fluctuation, and each shrinking percentage is within 5 percent; the complete shape of the cultural relics can be completely ensured, and the method conforms to the basic principle, namely the minimal intervention to protection of the cultural relics; the method has high research and extension values and significance.

Description

technical field [0001] The invention relates to a supercritical dehydration drying method for small water-saturated bamboo and wood wares, belonging to the technical field of dehydration protection of cultural relics. Background technique [0002] Water-saturated bamboo and wood ware are all kinds of living and production utensils made by ancient humans using bamboo wood, which are formed by long-term immersion in underground muddy water and degradation. Judging from the information we know today, water-saturated bamboo and woodware are human production tools or daily necessities that exist all over the world. [0003] When the water-saturated bamboo and wooden utensils are excavated, they usually contain a large amount of moisture, and some are quite decayed. If they are allowed to dry naturally after being unearthed, a strong spontaneous dehydration process will occur, causing the bamboo and wooden utensils to shrink seriously, deform or crack, and even collapse as a whol...

AI Technical Summary

Problems solved by technology

[0003] [0003] Bamboo and wooden utensils usually contain a lot of water when they are excavated, and some of them are quite decayed. If they are left to dry naturally after unearthed, a strong spontaneous dehydration process will occur , leading to serious shrinkage, deformation or cracking of bamboo and wood, and even overall collapse; if it is still soaked in water or buried in soil and not dehydrated in time, it will be eroded by various microorganisms or bacteria and accelerate decay, so most of them are saturated with water. After being unearthed, the bamboo and wood ware had to be soaked in water with preservatives, which was not convenient for display or scientific research.

In order to solve the problem of dehydration of saturated bamboo and wood ware, cultural preservation workers from all over the world have conducted extensive research on dehydration and shaping methods of saturated bamboo and wood ware, and achieved some results, such as PEG filling dehydration method, etc., but most of them have their own limitations The stability mainly lies in the mutual adaptability between the dehydrated filling material and the main body of the bamboo and wood ware, especially the aging resistance of the filled chemical material, so it is not conducive to the long-term preservation of the saturated bamboo and wood ware to a certain extent.

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