Study On Drying And Protecting Technology Of Bamboo Tubes

With the increasingly tight supply of natural forest wood, and the people's the increased demand for natural materials. The use form of bamboo have been developed in different levels. however, Bamboo characteristics of crack and mold easily became a serious impact on the use of bamboo and aesthetic needs in the environment, limiting the use of bamboo. In recent years, there have been about report of drying process research of various structural units of the large volume of wood and bamboo at home and abroad. variety of preservatives are constantly introduced, new anti sepsis process is also continuously adjusted and improved according to the size of different materials and features. This article is based on many domestic and international research, using the bamboos tubes as the basic structural units, make some drying and protection technology in comparison study in different research methods. Analysis the bamboo tubes in the natural drying process weight, diameter, wall thickness changes, under the conditions of drying process in the same kiln drying, build a relationship between the moisture content and length of bamboo equation. Research the length of the bamboo, wall thickness, treatment of bamboo cracking. According to the pharmacy weight gain, prevention effect and the results of scanning electron microscope, evaluate the pharmacy concentration, pressure time, pressure, temperature factors on the results of protection; use the mold test to observe 30 days of each mold process changes, The main conclusions are as follows:(1) The air drying properties of two bamboos indoor were studied and compared on condition that temperature was 25℃-38℃, and relative humidity was 34%-81%. The drying speed of Chi bamboo was far outweighs Mao bamboo In the beginning of drying. but the drying speed of Chi bamboo was very slow in the process of follow-up drying, however the drying speed of Mao bamboo exceed far that of Chi bamboo. Chi bamboo evaporate very centralizely and severely, but Mao bamboo evenly. The diameter change of Chi bamboo present more decentralized, but Mao bamboo was more balance. The diameter changes of both occurred all in beginning of drying. The thickness change of Chi bamboo wall had very large difference, Mao bamboo had less difference and more balance. In the process of follow-up drying the wall thickness of Chi bamboo did not change on the whole, but that of Mao bamboo still changed slowly.(2) Study on effect of various factors to the bamboo tubes splitting in the process of drying Phyllostachys pubescens tubes. Selecting the length, cell thickness and notch and non-notch as the research factors. The result showed that the longer the tubes length is, splitting degree is less, speed of drying is slower, and the time is longer. The thicker the wall thickness is, the tubes are uneasy to split. The notch is more splitting than the non-notch, the drying speed of notch is quicker. Analysis the reason of different shape of bamboo tubes after the drying.(3) In the protection of bamboo, from ratio of weight gain, the order of effect of the technological factors:pressure time> pressure> temperature> ACQ-B concentration. The pressure time and pressure of the process parameter showed a large increase, but also further study, the temperature and ACQ-B concentrations had no significant effect on weight gain. The optimal parameters for this test is ACQ-B concentrations 1.0%, pressure time 15h, temperature 65℃, pressure of 0.24MPa.(4) In the mold test, the order of effect of the technological factors on prevention effect:pressure> pressure time> ACQ-B concentration> temperature. The pressure and pressure time of the process parameter showed a large increase, but be different from weight gain ratio, the pressure has more effect on result than pressure time. More bigger the pressure, the better the prevention effect, the 0.24MPa is best. The longer the pressure time, the better the prevention effect, the 15h is best. The optimal parameters for this test is ACQ-B concentrations 1.0%, pressure time 15h, temperature 25℃, pressure of 0.24MPa.(5) The results show that the observed mold results and evaluation results of prevention effect are consistent. The SEM provides a powerful evidence for the prevention effect.