With the protection of tropical rain forests around the world, the decline of virgin forests and precious trees of large diameters has led to changes in the structure of raw materials for plywood. Instead, medium and small diameter plantations (referred to as diameters of 200 to 300 mm) are used. Plywood is produced from these small-sized plantations, and its production process and equipment are essentially different from traditional large-diameter materials. This article briefly introduces the differences between traditional plywood production processes and equipment.
1 wood section treatment
The method of small-diameter wood section treatment is completely different from that of large-diameter wood processing; the method of artificial stripping and chain saw cutting is generally only 1~2 pieces/min due to the production speed, which can not meet the production needs of small-diameter logs; small-diameter wood has relative volume due to its volume. If the large diameter material is much smaller, if the same number of veneers are to be cut in the same time, it is necessary to rotate the wood segments several times to meet the balance of production output. The wood section processing process is:
The production line of the small-diameter wood section is usually about 8 to 13 pieces/min, and the speed of the wood section is 0-60 m/min. The speed varies with the yield.
2 core
Manual core, mechanical core and halo core are all commonly used in the production of plywood in China, but they can not meet the production of plywood with small diameter wood as raw material. 2.1 The smaller the diameter of the laser core is, the core is required. The faster the speed, the greater the influence of the core error on the board rate; the original mechanical 3-point core and the halo core have been unable to make the production of small-diameter logs as raw materials. In order to meet the needs of small-diameter plywood cores, the XY laser centering method came into being. The principle is shown in the figure; according to the length of the wood segment and the required core speed, several laser probes are arranged in the length direction of the wood segment; currently the commonly used laser probe has a measuring speed of 1600 dots/s, and the number of laser probes is 1 ～7 unequal, the computer performs segmentation statistics on all the measurement data, and filters the accidental data (such as knots, cracks, tree pockets, etc.), and then counts the pieces of data for hundreds of thousands of measurement points. The best inner cylinder center position. The core accuracy of this method can reach ±0.05mm, the small diameter material is laser-scanned by XY core, the utilization rate of the single board can be increased by 2%~15%, and the whole board output rate can be increased by 5%~15%. The plate volume can be reduced by 20% to 50%. 3 Rotary cutting and cutting machine is the core equipment of plywood production since the birth of the 20th century, but its mechanical components and technology are constantly improving and perfecting;
3.1 Equipment quality
The weight of the rotary cutter device is important to ensure vibration and shock against static and dynamic loads during rotary cutting, but it is not necessary to make the frame and the body too bulky. After the weight of the rotary cutter reaches its rotary cutting performance requirement, excessive weight has no direct relationship with its performance. The material has a great influence on the performance of the rotary cutting machine. The rotary cutting machine base is currently used for steel, and the old rotary cutting machine is cast iron.
1 wood section treatment
The method of small-diameter wood section treatment is completely different from that of large-diameter wood processing; the method of artificial stripping and chain saw cutting is generally only 1~2 pieces/min due to the production speed, which can not meet the production needs of small-diameter logs; small-diameter wood has relative volume due to its volume. If the large diameter material is much smaller, if the same number of veneers are to be cut in the same time, it is necessary to rotate the wood segments several times to meet the balance of production output. The wood section processing process is:
The production line of the small-diameter wood section is usually about 8 to 13 pieces/min, and the speed of the wood section is 0-60 m/min. The speed varies with the yield.
2 core
Manual core, mechanical core and halo core are all commonly used in the production of plywood in China, but they can not meet the production of plywood with small diameter wood as raw material. 2.1 The smaller the diameter of the laser core is, the core is required. The faster the speed, the greater the influence of the core error on the board rate; the original mechanical 3-point core and the halo core have been unable to make the production of small-diameter logs as raw materials. In order to meet the needs of small-diameter plywood cores, the XY laser centering method came into being. The principle is shown in the figure; according to the length of the wood segment and the required core speed, several laser probes are arranged in the length direction of the wood segment; currently the commonly used laser probe has a measuring speed of 1600 dots/s, and the number of laser probes is 1 ～7 unequal, the computer performs segmentation statistics on all the measurement data, and filters the accidental data (such as knots, cracks, tree pockets, etc.), and then counts the pieces of data for hundreds of thousands of measurement points. The best inner cylinder center position. The core accuracy of this method can reach ±0.05mm, the small diameter material is laser-scanned by XY core, the utilization rate of the single board can be increased by 2%~15%, and the whole board output rate can be increased by 5%~15%. The plate volume can be reduced by 20% to 50%. 3 Rotary cutting and cutting machine is the core equipment of plywood production since the birth of the 20th century, but its mechanical components and technology are constantly improving and perfecting;
3.1 Equipment quality
The weight of the rotary cutter device is important to ensure vibration and shock against static and dynamic loads during rotary cutting, but it is not necessary to make the frame and the body too bulky. After the weight of the rotary cutter reaches its rotary cutting performance requirement, excessive weight has no direct relationship with its performance. The material has a great influence on the performance of the rotary cutting machine. The rotary cutting machine base is currently used for steel, and the old rotary cutting machine is cast iron.
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