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Among the non-wood plant fibers, bamboo has a high cellulose content, a slender fiber, and a large length ratio, which is a better raw material after wood. However, due to the density of bamboo, the material is harder, and the outer layer of bamboo green is waxy, which has adverse effects on the internal bonding strength of pulp and products. Therefore, attention should be paid to the softening treatment before pulping. The gramineous straw raw materials in non-wood plants have lower chemical content of cellulose and lignin than wood, hemicellulose and various solution extracts are high, and the fibers are shorter and the content of hybrid cells is higher. Therefore, it will affect the pulp fiber yield, the water filtration of the slurry and the exhaust and drainage of the fiber slab. The strength of the product is low and the water absorption rate is high. Therefore, measures should be taken for the selection and dosage of the adhesive.
A series of problems in the collection, storage and transportation of raw materials, so the choice of raw materials must be adapted to local conditions, and the production scale and technological route should be determined according to the source of raw materials and the conditions for establishing the plant. In addition to considering the quality of raw materials, attention should be paid to the availability and cost of raw materials when selecting raw materials. In addition to considering the storage method and storage capacity of raw materials, we must also pay attention to transportation and other issues. Especially for non-wood plant fiber raw materials, we must pay attention to the acquisition, storage and storage of raw materials.
The scientific use of raw materials is important in the case of mixed plant species and different textures. The reasonable combination of raw materials is one of the important measures to improve the quality of products, and it is also an effective way to expand the source of raw materials. The mix of raw materials includes wood and non-wood raw materials (organic and inorganic fiber raw materials), as well as needles and hardwoods of different tree species. When using low-quality raw materials, a suitable combination of high-quality raw materials can improve the product grade.
The bark accounts for 6% to 20% of the trees, with an average of about 10%. The bark in the wood sheet accounts for more than 10%, and the bark of the small diameter material and the branch material accounts for 13% to 28%, with an average of more than 20%. Shrubs are also an important forest resource. Although there is no obvious trunk, the diameter is generally less than 20mm, but the content of stem bark is relatively high.
The fiber content in the bark is extremely low, but the content of the solution and the ash content are very high. If the bark fragments float on the surface of the slab, it will affect the appearance quality of the plate surface; if it is sandwiched inside the slab, it will reduce the mechanics of the product. performance. Non-timber plant fiber straw raw materials, the outer skin of straw has a thick layer of skin (such as cotton stalk, bean straw, sunflower stalk), while most stems have a smooth epidermal tissue. The smooth epidermal tissue is an ester wax formed by a fatty compound (such as bamboo, hemp, bagasse, etc.), which affects the formation of effective adsorption adhesives and hydrogen bonds, and reduces the bonding strength of the product.
In short, due to the large variety of raw materials for manufacturing fiberboard, in order to ensure the quality of fiberboard products and stable production efficiency, the selection and rational matching of raw materials is extremely important. At the same time, according to the characteristics of raw materials, the corresponding reasonable production technology and technical equipment should be adopted.
Raw materials are the material guarantee for fiberboard production and the basis for determining product quality, performance and efficiency. The raw materials used for the manufacture of fiberboard are extremely extensive, and the quality of the fiberboard directly affects the quality of the product. The quality of raw materials should be comprehensively evaluated and selected from the aspects of fiber content, morphology, chemical composition and processing properties. In terms of quality, wood is the best raw material. The wood has a high content of tracheids and slender fibers, and its quality is higher than that of hardwood. In addition, the trunk is better than the branch and the tip, the sapwood is better than the heartwood, and the early material is better than the late material. The material of the tree section is hard, the fiber is short, and the fiber material should not be too much.