Difference between veneer rotary cutting and planing of birch
Birch veneer refers to the wood material obtained by turning or planing the logs with a thickness of about 1mm, which is used to make plywood and other artificial boards. Rotary cutting or planing is the most important part of birch veneer production process, whose quality directly affects the final quality of wood-based panel. So what is the difference between birch veneer rotary cutting and planing?
1. Comparison between planer and rotary cutter
Rotary cutting can be divided into two types: rotary cutting with card and rotary cutting without card. Rotary cutting with card mainly processes wood with larger diameter, while rotary cutting without card is processing small-diameter logs. Rotary cutting machine is generally large in size and complex in structure. Log centering is required before machine operation. If centering is not accurate, continuous veneer belt or narrow veneer will be rotated at the beginning of rotary cutting. The more broken veneer or narrow veneer, the more edge veneer with good material loss, which is not conducive to the continuity of production.
The width of planing veneer is narrow, generally 300 RNM. It has special requirements. Compared with the electromagnetic motor, the most remarkable feature of the ultrasonic motor is that it has the characteristics of large torque output at low speed. The torque density (torque weight ratio) of the ultrasonic motor is 100 to 1000 times of the torque density of the electromagnetic motor, which is simple and flexible in structure and various in motion.
2. Comparison between veneer of rotary cutting and planing
The thickness of veneer is about 0.25-5.5mm, and the thickness of veneer can be up to 12mm in foreign special-purpose veneer cutters; the thickness of veneer planing varies widely from 0.2 to lomm. At present, the thickness of veneer made by rotary cutting machine is more than 1 mm and less than 3 mm, and the thickness uniformity of veneer in this range is good, which is convenient for glue application and other processes in the production of plywood and is not easy to penetrate.
The planing veneer has beautiful and lifelike texture, which is suitable for making parquet patterns, plywood, veneer of furniture and building parts, etc. the planing veneer not only has the tangential texture of the veneer, but also has the radial texture and radial texture with the least shrinkage, which is the most natural and natural wood reality. Because the longitudinal planing is along the length direction of the wood fiber, it can avoid There is no crack in veneer caused by transverse planing. The transverse tensile strength of planing veneer is higher than that of rotary cutting veneer, and there is almost no back crack and surface crack. It is not only uniform in thickness, but also has a good degree of smoothness. It can be directly decorated with high-grade veneer without sanding, thus improving the strength and surface quality of veneer.
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