The influence of the hottest new wood materials on

2022-08-18
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The influence of new wood materials on the development of woodworking machinery

new wood materials are an important component and technical leader of modern wood industry, which makes the selection of experimental force more flexible;. With the change of natural resources and the progress of science and technology, the development of wood industry has gradually developed from the utilization of raw logs to the utilization of sawn timber, veneer, shaving, fiber, non wood and chemical components, forming new materials and products, such as laminated veneer, integrated timber, heavy-duty wood, oriented particleboard and other wood engineering materials and products, wood/plastic composites, wood/bamboo composites Wood composite materials and products such as wood conductive materials and wood ceramics. The development of new materials and new wood product structures has promoted the technological progress of wood processing machinery and equipment

1. Development status of new wood materials

1.1 wood engineering materials and products

wood engineering materials process wood into wood, wood strips, veneers, shavings or fibers, and then use modern technology to reorganize wood components into new wood materials and products. They have the geometric properties, identity, uniformity and surface formability that the original wood does not have. Such as laminated timber, laminated veneer lumber, laminated veneer lumber, long planed laminated timber, reconstituted wood, directional particleboard, etc

gluedlaminatedtimber (Glulam for short) is a kind of wood material made of sawn boards or square timber and glued along its length, width or thickness with adhesive in the direction parallel to the fiber. It is a new type of material whose wood properties are closest to and better than solid wood. The laminated materials can be processed into straight and curved shapes, or cross-section gradual change structures along the length direction, and can also be processed into I-shaped and hollow square cross-sections. According to the purpose, it can be divided into structural laminated timber and non structural laminated timber. Structural laminated timber is mainly used for the wood structural beams of gymnasiums, concert halls, workshops, warehouses and other buildings. As the bearing material of three hinged arch beams, it has good physical properties, economy and beautiful shape. It can also be used for the bearing beams of bridges and carriages. Non structural laminated timber is mainly used for furniture and interior decoration

Europe, Canada, the United States, Japan and other countries have conducted in-depth research on wood engineering materials and products, developed many new wood materials, structural components and connecting components, and gradually formed a professional, large-scale and standardized system for the production of wood engineering materials and products

the total annual output of Glulam in European and American countries is up to 1million m3. Nearly 200 manufacturers in Japan produce laminated materials. The development of domestic laminated timber began in the 1980s, mainly in the production of non structural laminated timber. At present, there are more than 500 Glulam manufacturers, and the actual production capacity can reach 3million m3. The production, process and market are mature in China

laminatedveneerlumber (LVL) is a veneer that uses rotary cutting or planing, and laminated and glued wood materials along the fiber direction of wood. Laminated veneer lumber has the characteristics of uniform mechanical properties, high strength and flexible specifications, which is superior to solid wood. It can be used for sawing, planing, gouging, tenoning and other processing, as well as subsequent processing such as riveting, mitering and hinge joint. It is especially suitable for large-span wood structures. According to the purpose, it can be divided into structural laminated veneer lumber and non structural laminated veneer lumber. Structural laminated veneer lumber is mainly used in building load-bearing walls, partitions, frames, bridges, sleepers and other fields, especially suitable for long-span beams and some fields that cannot be simply replaced by solid wood, plywood and steel. Non structural laminated veneer lumber is mainly used for furniture, door and window frames and other decorative materials

in North America, the total output of laminated veneer lumber reached more than 1.6 million m3, accounting for 3% of wood consumption. At the same time, Finland, New Zealand, Australia and other countries are also actively developing ultra long components that meet the length and strength requirements of building materials. Non structural laminated veneer lumber is the most representative in the Japanese market, with the largest market ownership and import volume. The research on laminated veneer lumber in China began in the late 1980s, mainly because the fine standard is more than 1million yuan and less than 2million yuan, and the small-size non structural laminated veneer lumber is produced by plywood equipment. There are dozens of manufacturers, and the large-size structural laminated veneer lumber has not yet started production

1.2 wood composites and products

wood composites are new materials with special microstructure and properties, which are composed of wood (its various forms, including fibers, veneers, shavings, etc.) as matrix materials and other materials. By using the composite effect of wood and other materials, we can overcome the defects of the main physical and mechanical properties of wood and endow wood with new functions, so as to improve the use value and utilization rate of wood. Such as wood/plastic composites, wood/bamboo composites, etc

wood/plastic composite material refers to the composite material filled with modified thermoplastic reinforced by wood fiber or plant fiber, which combines the cost and performance of wood and plastic, and replaces wood and plastic by extruding, pressing or injection molding plates or other products. Wood/plastic composites can solve the problems of easy decay, moth eaten, cracking, biodegradation and poor dimensional stability of traditional wood products. Their products are mainly used as various outdoor structural and non structural plates and profiles, environmental safety furniture materials and composite floor cores with high dimensional stability

the manufacturing of wood composites in foreign developed countries originated in the 1980s, and gradually formed a new industry with rapid development in the mid-1990s. In recent years, high-performance wood/plastic composites have developed rapidly in the world, especially in the United States and Canada. According to the statistics of 1996, there are about 70 enterprises in the United States and Canada, which produce 450000 ~ 670000 m3 of wood/plastic composites every year, with an annual output value of 40-60 million US dollars. At present, Trex, Andersen and strandex have a relatively large market share in wood/plastic composites in the United States

in the late 1990s, China began to promote the research and development of wood composites, and made some progress in the basic theories of wood surface depolarization, wood esterification and graft copolymerization, as well as the development and research of wood/plastic composites, wood electromagnetic shielding functional materials, wood ceramics, wood/bamboo composites and so on

wood/bamboo composite material is a new type of structural material with high strength, good toughness and processability, and the dual advantages of heavy wood and heavy bamboo

2. Development status of wood processing machinery

with the progress of science and technology, the development of new materials, and the deepening of wood processing technology theory, wood processing machinery has developed rapidly in terms of variety and quantity, dynamic and static performance, precision, mechanization, automation, safety, and high-tech applications. The development of wood processing machinery shows the following characteristics:

2.1 the wide application of computer numerical control technology in wood processing machinery

with the rapid development of microelectronics and computer technology and the wide application of cybernetics, computer numerical control technology is more and more applied to wood processing machinery, which improves the accuracy, processing flexibility and production efficiency of wood processing. Representative ones include CNC machining center, CNC router, CNC plate sawing center, CNC multi row drill, CNC dining chair component machining center and CNC profiling edge grinder

2.2 the application of new technology has driven the technological progress of wood processing machinery

the continuous application of new technology of wood processing has put forward new requirements for traditional wood processing machinery and promoted the development of wood processing industry. For example, the processing technology of profiled imitation wood optimizes the preparation of wood raw materials; The finger joint technology of engineering structural timber improves the quality and strength of solid wood panels; The high-speed multi blade sawing process realizes the unification of sawing and planing processes; 3D finishing technology has broadened the application fields of artificial panels

2.3 all kinds of modern advanced technologies are applied to wood processing machinery

modern advanced technological achievements such as numerical control processing technology, robot technology, industrial automation technology, new material technology and new biology, environmental protection equipment technology, wood nondestructive testing technology, information network technology have been widely applied to wood processing machinery, which has promoted, promoted and transformed the development of wood processing machinery, First, pan xueshu said that technological content has become the key to win in market competition

2.4 wood processing machinery shows a development trend of high-speed, specialization and scale.

from raw material preparation, product processing to finished products, the feeding speed, milling speed of processing spindle and transportation speed of wood processing machinery show a high-speed development. With the increase of new materials and new products and the change of structure, new types of wood processing machinery are continuously developed, and more and more technologies and equipment for the whole production line are provided, which meets the special requirements of users and significantly enhances the competitiveness

in the field of wood processing machinery technology and equipment, Germany, Italy, Japan, the United States and other countries are the main producers of international wood processing machinery, which occupy a leading position in the supply of the international market. It takes a leading position in terms of GDP, export trade volume, technical level of products and the number of international patents. Foreign wood processing machinery is developing in the direction of expanding the application range of raw materials, improving its utilization rate and product quality, energy saving and paying attention to environmental protection

after more than half a century of development, China's wood processing machinery industry has begun to take shape and basically formed into a complete system, becoming a large country in the production of wood processing machinery. At present, there are more than 600 wood processing machinery manufacturing enterprises, including about 200 with a certain scale, and more than 1100 products in 69 categories. The products are sold to the United States, Russia, Southeast Asia and other countries and regions, with an annual total industrial output value of more than 10 billion yuan. At present, the overall technical level of domestic wood processing machinery is close to the foreign advanced technical level, including chippers, heavy-duty broadband Sanders, precision cutting machines, linear edge banding machines and many other brand products, which enjoy a high reputation in the domestic market and are the preferred equipment for domestic users

however, compared with developed countries, China's wood processing machinery still has a certain gap in the number of varieties, product functions, NC popularization rate, processing accuracy and environmental protection indicators. The ability of equipment innovative design and process research and development is not strong, especially the innovation ability of host equipment and key technology is not enough, and it has been at the level of tracking and imitation for a long time. With China's reform and opening up and the development of social economy, it provides a broad market space and development prospects for the development of wood processing machinery manufacturing industry. But at the same time, foreign advanced wood processing equipment will flood into the Chinese market, which will make China's wood processing machinery manufacturing industry face more severe competition and challenges

3. The development of wood processing machinery is the basis of the development of new materials.

wood processing machinery is an important means to realize the modernization of wood industry. In recent years, with the rapid development of the wood industry, new wood materials and products continue to emerge, and modern equipment is needed to meet the needs of industrial production of new materials and products. Wood processing machinery plays an important role in the development of the wood industry

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