Bamboo classification
The use of bamboo has two types of raw bamboo utilization and processing. When bamboo is used Bamboo is used as building materials, transporting bamboo rafts and infusion pipes; medium and small bamboo materials for making stationery, musical instruments, farm tools, bamboo weaving, etc. Processing and utilization have a variety of uses, such as bamboo laminates can be made of mechanical wear parts; bamboo and wood composite panels have been made into the first bamboo single-wing advanced trainer; bamboo wood-based panels can be used as engineering materials. In addition, bamboo yellow can also be made into a variety of arts and crafts. Bamboo is also an important raw material for papermaking, fiberboard and acetate, and nitrocellulose. Bamboo charcoal has a higher surface hardness than charcoal and can be used in the smelting industry and in the production of activated carbon.
Bamboo raft introduction
The bamboo stalk is divided into sections, and between the two sections is the internode (see bamboo). The cross-section of the stalk wall between the joints is from the outside to the inside: the epidermis, the subcutaneous layer, the cortex, the basic parenchyma (including the vascular bundle) and the medullary ring. The vascular bundle of the section is slightly curved outward or inward, and there is also a return to the segment. The outer edge of the vascular bundle is dense, the center is sparse, and the diameter and direction are uncertain. It is divided into many fine branches, which are interwoven into a network, which is the main channel for the lateral flow of bamboo liquid. The cells of the basic parenchyma of the septum are thickened and hardened.
Bamboo performance
The density of bamboo varies depending on the bamboo age (larger density of maturity), the location (larger density of the outer edge of the tip or stalk wall), and the bamboo species, with an average of about 0.64 g/cm3. The shrinkage rate of bamboo is lower than that of wood, the string shrinkage rate is the largest, the radial direction is second, the longitudinal direction is the smallest; the water loss is fast and uneven when dry, and it is easy to crack; the air-dried bamboo has strong water absorption. The tensile strength of the grain is higher, the average is about 2 times that of the wood, the tensile strength per unit weight is about 3-4 times that of the steel, and the shear strength of the grain is lower than that of the wood. The intensity gradually increases from the base of the bamboo stalk and varies depending on the bamboo species, age and site conditions.
The chemical composition of bamboo is: 40% to 60% of cellulose, 14% to 25% or more of hemicellulose, and 16% to 34% of lignin, which tends to increase with age. Extract: cold water leaching 2.5% to 5%, hot water leaching 5% to 12.5%, alcohol-diethyl ether leaching 3.5% to 5.5%, alcohol-benzene leaching 2% to 9%, 1% sodium hydroxide leaching 21% to 31 %. In addition, the protein is 1.5% to 6%, the fat gum is 2% to 4%, the starch is 2% to 6%, the reducing sugar is about 2%, the nitrogen is 0.21% to 0.26%, and the ash is 1% to 3.5%. The total amount of phosphorus, potassium, etc. is decreasing year by year, while silicon is increased, accumulating in siliceous cells, and the bamboo green can reach 4.35% or more.
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