Shandong Minghung Wood Machinery Co., Ltd. specializes in the design, development, manufacture and export of plywood equipment. The company is a high-tech enterprise integrating scientific research, production and export. The company has more than 20 invention patents for the research and development of veneer dryers. Due to different raw materials, different moisture content of veneer, different density of veneer, different output requirements, different working conditions, moisture content of veneer after drying, shrinkage of veneer, compression ratio of veneer, veneer The cracking state of the veneer, the flatness of the veneer and other factors have been studied in depth, and the factors affecting the drying of the veneer have been carefully analyzed, and the actual working conditions of the drying machine in the customer's factory have been compared and summarized. Veneer drying equipment. MINGHUNG brand veneer dryer, featuring energy saving, high efficiency, stable operation, high quality and numerical control technology.
Carefully analyze the log structure of each customer, the specific analysis is as follows:
1. Poplar, the wood heartwood content is 14.6%-34.1%, the moisture content of the raw wood is 86.2%-148.5%, and the raw wood is dried to a moisture content of 12%, the resulting dry shrinkage rate is 8.66%-11.96%, air-dry density It is 0.386g/cm³, the compressive strength along the grain is 25.6-38.5Mpa, the flexural strength is 48.7-73.0Mpa, and the flexural elastic modulus is 7551-10395Mpa.
2. Eucalyptus wood, air-dry density 0.56-0.86g/cm³. The shrinkage of eucalyptus wood during the drying process is called collapse, which is caused by the collapse of cells due to the rapid movement of water, capillary tension and drying stress when the wood is dried. Abnormal, irregular shrinkage) and cracking are the more serious drying defects, especially shrinkage. The occurrence of shrinkage not only greatly reduces the strength of wood, but also reduces the utilization rate of wood. Serious shrinkage also causes internal cracks in the wood, and even makes the wood scrapped.Combining conventional drying, vacuum drying and conventional-vacuum combined drying, the drying characteristics and drying benchmarks of Eucalyptus roundedi and Eucalyptus citri plantations were studied. The two eucalyptus woods were cracked and shrunken seriously in the early stage, and the section deformation reached 5 Grade, which is difficult to dry, especially when the moisture content is above 30%, the drying speed should not be too fast, and it needs to be treated in the early, middle and final stages. Large drying deformation, surface cracking, serious shrinkage.
3. Pine, air-dry density 0.4--0.5g/cm³ is soft pine, air-dry density 0.5-0.7g/cm³ is hardwood pine.
4. Beech wood, air-dry density 0.79g/cm³
5. European Beech Common Veneer Drying, the air-dry density is 0.67-0.72g/cm³, the dry shrinkage and deformation of beech are large, and the average weight of wet wood is 961kg/m³. Drying is relatively quick, usually a steam fumigation process prior to processing.Birch, air-dry density 0.59-0.72g/cm³.
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