Comparison of rotary cut veneer and sliced veneer
Veneer processing is an important process for the production of artificial boards such as plywood and veneer lumber (LVL). At present, the two main methods of veneer processing at home and abroad are rotary cutting and planing, and the corresponding processing of the veneer is called rotary cutting. Veneer and sliced veneer.
The thickness of the rotary cut veneer and the sliced veneer depends on the process specifications of the respective machine. The thickness of the rotary-cut veneer in China is about 0.25-5.5mm. The thickness of the rotary-cut veneer of foreign special-purpose rotary cutting machine can be up to 12mm; the thickness of sliced veneer varies widely, which is 0.2. ~lOmm.
At present, the thickness of the veneers manufactured by the rotary cutting machine is mostly above lmm and below 3 mm. The thickness uniformity of the veneers in this range is good, and the process of sizing in the process of producing plywood is convenient and difficult to penetrate. The rotary cut veneer has a large format and a beautiful chord pattern.
Nowadays, with the improvement of people's living standards, people's requirements for quality of life are getting higher and higher. In order to make full use of high-quality wood, the veneer (also known as thin wood) is currently used in a planing process. The sliced veneer is beautiful and realistic, and is suitable for parquet patterns, plywood and veneering of furniture and construction parts.
Planed thin wood (single board) has the following advantages and is favored: 1 sliced veneer not only has the chord-like texture of the rotary-cut veneer, but also the beautiful and natural wood that is not available in the rotary-cut veneer. And the radial texture and radius-to-texture with the smallest shrinkage. 2 Because the longitudinal cutting is along the length direction of the wood fiber, the veneer crack caused by the transverse cutting is avoided, and the transverse tensile strength of the sliced veneer is higher than that of the rotary veneer, and there is almost no back crack and plate crack. Not only the thickness is uniform, but also the smoothness is very good. It can directly decorate the veneer without sanding, thus improving the strength and surface quality of the veneer. 3 Compared with sawing and rotary cutting veneers, the thickness of sliced veneers is more than 0.2mm, which is convenient for the development of micro-thin wood. It can more effectively utilize precious and rare wood and expand the use area of precious high-quality wood.
Rotary cut veneers are generally used to produce plywood and veneer lumber; while planed veneers are generally thin and can be applied to the surface of board, medium density fiberboard and plywood, and are high-end furniture, musical instruments and buildings. The main material of the decoration is also the main material for the surface of the secondary processing of the wood-based panel. Both the rotary cut veneer and the sliced veneer can be used as decorative materials. Generally, there are two types of cut wood grain and string cut wood grain, but the cut wood grain is more acceptable than the string cut wood grain. With the maturity of veneer lumber production technology, it has been widely used in construction, furniture and vehicle and ship manufacturing industries. The use of thick veneers for the manufacture of veneer lumber is advantageous for the production process and cost reduction. Due to the increase in the thickness of the veneer, such as the production of LvL with the same thick solidity, the number of veneers can be reduced, thereby reducing the amount of veneer coating and reducing environmental pollution. Glue is harmful to the human body). In addition, the time for pre-compression, hot pressing, and blanking is greatly reduced, and productivity is improved.
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