1 Traditional production processes and defects
1. 1 Traditional production process, round sawn timber, Cooking Pot or cooking pool, steamed, sliced, bleached, cleaned, dried, cut, stored.
1 .2 cooking defects
1 Dyeing. The coniferaldehyde group in the lignin chemical structural unit is composed of three basic chromophoric groups, and the group is heated by the cooking time in the cooking pot or the cooking pool, thereby causing the wood to develop color. In addition, tannins, resins, etc. in the leachate will produce color. Surface and end dyeing of wood during high temperature cooking. For example, when the eucalyptus wood is cooked for 48 hours, the end of the head is immersed in 60mm and the surface is dyed by 3mm. The dyeing loss of a 2m long wood square is about 6%.
2 Surface and internal cooking strength are inconsistent. Under normal circumstances, the larger the wood, the greater the difference between the appearance and the internal softening degree, the inconsistency of the strength, the natural drying and warping is serious, and the drying cost cannot be reduced.
2 Improved production process and characteristics
2. 1 Production process logwood sawdust î ‡ room temperature softening pool î ‡ planing î ‡ cooking î ‡ bleaching î ‡ cleaning tank î ‡ dry î ‡ shear î ‡ storage.
2. 2 Process characteristics
1 No pollution. Since the wood is not subjected to high temperature treatment, tannins, resins, etc. do not produce color, and there is no contamination of the wooden ends and surface phenomena.
2 Wood needs to be softened. Since the wood is not subjected to heat treatment, in order to increase its plasticity, the wood must be soaked in a normal temperature nozzle placed in the softener before cutting, and then immersed for 2 hours.
3 The angle of the knife is small, and the thickness of the thin wood is very small, generally 0 25 to 0 5 mm. To ensure that the board surface is smooth and smooth, the tool grinding should be as small as possible (preferably less than 17 degrees), and the angle after the tool is also small to reduce the crack on the back of the thin wood and maintain the strength of the thin wood.
2. 3 Thin wood cooking and cutting thin wood should be put into the cooking tank for cooking, so as to be more fully softened and easy to use.
2. 4 Bleaching such as thin wood requires bleaching. The bleaching agent can be directly bleached into the cooking tank, but the cooking temperature should be appropriately lowered, generally 70-80 degrees, and the cooking time is prolonged.
2. 5 Thin wood drying Because the wood is immersed before cutting, the thin wood has a high moisture content. When the moisture content exceeds 20%, it is easy to mold, so it must be dried to become the final product. After the improvement of the processing technology, the sliced ​​wood has a uniform degree of softening inside and outside, so it can be dried in the sun or in the shade. In the case where the water content is not less than 15%, no cracking or warping deformation occurs, thereby greatly reducing the drying cost. At present, thin wood drying basically adopts rolling steam drying, which is characterized in that the thin wood after drying is easier to be flat, the water content is easy to control, but the production cost is high. Therefore, to obtain a thin wood with a final moisture content between 12% and 15%, combining natural drying with mechanical drying is the best solution for drying thin wood.
1. 1 Traditional production process, round sawn timber, Cooking Pot or cooking pool, steamed, sliced, bleached, cleaned, dried, cut, stored.
1 .2 cooking defects
1 Dyeing. The coniferaldehyde group in the lignin chemical structural unit is composed of three basic chromophoric groups, and the group is heated by the cooking time in the cooking pot or the cooking pool, thereby causing the wood to develop color. In addition, tannins, resins, etc. in the leachate will produce color. Surface and end dyeing of wood during high temperature cooking. For example, when the eucalyptus wood is cooked for 48 hours, the end of the head is immersed in 60mm and the surface is dyed by 3mm. The dyeing loss of a 2m long wood square is about 6%.
2 Surface and internal cooking strength are inconsistent. Under normal circumstances, the larger the wood, the greater the difference between the appearance and the internal softening degree, the inconsistency of the strength, the natural drying and warping is serious, and the drying cost cannot be reduced.
2 Improved production process and characteristics
2. 1 Production process logwood sawdust î ‡ room temperature softening pool î ‡ planing î ‡ cooking î ‡ bleaching î ‡ cleaning tank î ‡ dry î ‡ shear î ‡ storage.
2. 2 Process characteristics
1 No pollution. Since the wood is not subjected to high temperature treatment, tannins, resins, etc. do not produce color, and there is no contamination of the wooden ends and surface phenomena.
2 Wood needs to be softened. Since the wood is not subjected to heat treatment, in order to increase its plasticity, the wood must be soaked in a normal temperature nozzle placed in the softener before cutting, and then immersed for 2 hours.
3 The angle of the knife is small, and the thickness of the thin wood is very small, generally 0 25 to 0 5 mm. To ensure that the board surface is smooth and smooth, the tool grinding should be as small as possible (preferably less than 17 degrees), and the angle after the tool is also small to reduce the crack on the back of the thin wood and maintain the strength of the thin wood.
2. 3 Thin wood cooking and cutting thin wood should be put into the cooking tank for cooking, so as to be more fully softened and easy to use.
2. 4 Bleaching such as thin wood requires bleaching. The bleaching agent can be directly bleached into the cooking tank, but the cooking temperature should be appropriately lowered, generally 70-80 degrees, and the cooking time is prolonged.
2. 5 Thin wood drying Because the wood is immersed before cutting, the thin wood has a high moisture content. When the moisture content exceeds 20%, it is easy to mold, so it must be dried to become the final product. After the improvement of the processing technology, the sliced ​​wood has a uniform degree of softening inside and outside, so it can be dried in the sun or in the shade. In the case where the water content is not less than 15%, no cracking or warping deformation occurs, thereby greatly reducing the drying cost. At present, thin wood drying basically adopts rolling steam drying, which is characterized in that the thin wood after drying is easier to be flat, the water content is easy to control, but the production cost is high. Therefore, to obtain a thin wood with a final moisture content between 12% and 15%, combining natural drying with mechanical drying is the best solution for drying thin wood.
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