China's wood-based panel industry strives to practice the concept of clean production and green development, accelerate industrial upgrading, constantly improve the level of process technology and equipment technology, improve the supply capacity of high-quality wood-based panel products, and achieve sustainable and healthy development of the industry.
01 Wood-based panel production technology development
The level of automation and continuity of plywood has been further improved, the application of automatic veneer production line has been expanded, and the whole sheet of veneer has progressed rapidly, such as horizontal veneer and longitudinal veneer, the proportion of natural drying of veneer has gradually decreased, and the demand for drying machines has continued to rise. Automated billet technology, single-side gluing, atomizing gluing technology has received attention, and the research and development of continuous flat pressing production technology of plywood has continued to advance, and the concentration and labor productivity of the plywood industry are gradually improving.
China's fiberboard, particleboard production technology in keeping with the world's equipment technology level synchronization and integration at the same time, continuous innovation and breakthrough. Slab steam preheating technology and equipment have been widely used in the continuous flat pressing production line, and the continuous flat pressing ultra-thin fiberboard production line is in the world's leading level.
The technology and equipment of disc long wood planing and rotary cutting are further applied in the production of directional particleboard, and the preparation technology and equipment of large particleboard are applied in the production of high-strength particleboard. Environmental protection technologies such as thermal energy centers, flue gas drying, efficient dust removal, and sewage treatment are also constantly improved and upgraded, further improving production efficiency and product quality.
People pay more attention to the environmental health of the living room, and the demand for aldehyde-free wood-based panel products is highlighted. The wood-based panel industry conforms to the requirements of The Times, the pace of green upgrading has accelerated, and the aldehyde-free adhesives have been rapidly developed.
At present, the aldehyde-free adhesives used in the wood-based board industry mainly include polyurethane adhesives (mainly isocyanate adhesives MDI and water-based polymer-isocyanate adhesives EPI), bean based protein adhesives, starch based adhesives, lignin adhesives, thermoplastic resin adhesives, tannin adhesives, etc. The development of aldehyde-free adhesive technology focuses on improving the process, reducing the cost and improving the performance.
02 Wood-based panel production equipment
In the face of changes in consumption upgrading demand, the continuous improvement of environmental protection requirements, China's wood-based panel industry transformation development mode to adapt to changes in market demand, wood-based panel enterprises transformation and upgrading efforts to innovate production process and technology, increase investment in new product research and development, increase effective supply.
As of the end of the "13th Five-Year Plan" in 2020, China has 136 continuous flat-pressed fiberboard production lines, with a total annual production capacity of 2 695m3, accounting for about 52.0% of the total production capacity of fiberboard in the country; There are 73 continuous flat-pressed particleboard production lines, with a total annual production capacity of 17.63 million m3, accounting for 47.8% of the total production capacity of particleboard in China.
02-1 Single line production capacity continues to improve
During the "13th Five-Year Plan" period, the average annual production capacity of fiberboard in China increased from 76,300 m3 to 114,000 m3, an increase of 49.4%, and the backward equipment of fiberboard production lines with an annual production scale below 50,000 m3 were basically eliminated. The average single-line annual production capacity of particleboard increased from 58,400 m3 to 106,000 m3, an increase of 81.5%, and the gap with the average single-line production scale in developed countries has further narrowed. The increase in the average single line production size of fiberboard and particleboard shows that the level of equipment is constantly improving.
02-2 Progress in key equipment
At the end of the 13th Five-Year Plan period, there are more than 100 wood-based panel machinery and equipment manufacturing enterprises above designated scale in China, with annual sales of about 4.5 billion yuan, which can provide 39 categories and more than 800 kinds of wood-based panel machinery products, and has the world's most comprehensive and complete wood-based panel machinery industrial structure and product categories.
The application of plywood automatic veneer production line continues to expand, and the improved non-stuck veneer rotary cutting machine can process scraps of veneer into large thin shavings before spinning, and its speed can reach 300 m/min.
Ultra-thin fiberboard equipment is the world's leading, 0.8mm thick ultra-thin fiberboard production equipment research and development breakthroughs. The production capacity and technical level of domestic long wood planer have been further improved; The fire protection system of continuous flat press has been applied on a large scale. The on-line detection equipment for panel defects has been successfully developed and applied.
The running speed of fiberboard and particleboard sand saw line has achieved a breakthrough, reaching 150 m/min, the automatic sorting and packaging production line has begun to be applied on a scale, and the wax saving device has been successfully developed and promoted in the production of fiberboard and particleboard.
The overall development of China's wood-based panel machinery manufacturing industry presents the development of products from low and middle to high-end, and the equipment technology level is from artificial, semi-mechanized, semi-automated to mechanization, automation, numerical control and intelligent development.
03 at the end
Wood-based panel industry has two major functions of carbon storage and emission reduction. As an extension of forest resource utilization, wood-based panel products are a part of the carbon cycle of forest ecosystem and an important carrier of carbon storage flow, and have positive significance for the carbon balance between forest ecosystem and atmosphere and the adjustment of carbon turnover rate and turnover amount in atmosphere.
At the same time, carbon emissions in the production process of wood-based panels are much lower than other basic materials such as steel and cement, and comprehensively promote the utilization of wood-based panels as building materials and green low-carbon circular development, which is not only an inevitable requirement for the high-quality development of the industry, but also an important measure to promote the positive contribution of the industry to carbon peak carbon neutrality.
