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Processing technology of bamboo floor

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日期: 2013-12-11
浏览次数: 10

Conventional production process of bamboo floor (366 bamboo floor finishing)

Bamboo → cutting → flattening the outer bamboo section → cutting → removing the inner section → planing both sides of the bamboo section (removing the bamboo green and yellow) → cooking (anti insect and anti mildew treatment) or carbonization and coloring treatment → drying → fine planing of the bamboo section → sorting of the bamboo section → gluing → blank assembly → hot pressing and gluing → sanding → cutting at a fixed length → planing all sides (fixed width and back groove) → double end milling (transverse and longitudinal tenoning) → spraying edge sealing paint → element Plate sanding → sorting → dust removal → waterborne primer → hot air drying → putty application → UV curing → primer → UV curing → sanding → primer → UV curing → sanding → finish → UV curing → scratch resistant finish → UV curing → inspection → packaging


Production process


1. Bamboo inspection

Generally, bamboo is used as raw material for bamboo floor, but the mechanical properties of bamboo are closely related to the bamboo age and the position where the bamboo is taken. When the bamboo age is less than 4 years, the degree of lignification of the internal components of the bamboo is not enough, the strength is not stable, and the rate of dry shrinkage and wet expansion is large. The bamboo with more than 5 years should be selected. Bamboo is generally thick at the root and thin at the tip. Therefore, the fresh bamboo with diameter at breast height more than 10cm and wall thickness more than 7mm is generally selected as the raw material.


2. Broken material

Phyllostachys pubescens has thick roots and thin tops. The bamboo tube is divided according to the wall thickness and cut into the specified length.


3. Film making

Turn the original bamboo into regular bamboo strips


4 preliminary planing

The dried bamboo strips need to be planed on four sides for fine planing, to remove the residual bamboo green, bamboo yellow and knife marks left by rough planing, etc. only after such treatment can the bamboo strips and bamboo strips be glued firmly, without cracks, cracks and stratification. After finishing planing, the bamboo strips shall be sorted, and the bamboo strips with processing size not meeting the requirements and with large color difference shall be removed from the production line.


The surface of bamboo strips was treated preliminarily. The surface is planed to be green and yellow, that is, the bamboo skin and the bamboo flesh are removed, and only the middle coarse fiber layer is retained. The traditional bamboo products are made by bending the whole tubular bamboo into a specified shape without planing and yellowing. The surface bamboo green, that is to say, the density of the part of the bamboo skin is different from that of the coarse fiber, and the shrinkage deformation rate is different under the same dry humidity condition, so it is easy to cause cracking. And the bamboo yellow is the bamboo flesh part of the inner wall of the bamboo tube. It contains high sugar and other nutrients, and it is easy to grow insects and mildew if not removed.




In terms of thickness, because the bending strength of bamboo is higher than that of wood, the 15mm thick bamboo floor has enough bending, compressive and impact strength, and has a good foot feel. Some manufacturers in order to cater to the mentality of consumers, the thicker the better, do not go green, do not go yellow, bamboo plywood, although the thickness of the bamboo floor can reach 17mm, 18mm, but the bonding strength is not good, on the contrary, it is easy to crack. After the bamboo green and yellow on both sides of the bamboo are roughly planed off, the bamboo floor with high quality should be planed precisely to make the bamboo slab glued tightly. The tolerance of thickness and width should be controlled within 0.1mm. The adhesive used for gluing the bamboo slab will also solidify rapidly under the action of high temperature, and the degree of gluing is very strong. 5. Cooking, bleaching or carbonization


The chemical composition of bamboo is basically the same as that of wood, mainly cellulose, hemicellulose, lignin and extract. However, bamboo contains more protein, sugar, starch, fat and wax than wood. When the temperature and humidity are appropriate, it is easy to be eroded by insects and fungi. Therefore, after rough planing, bamboo strips need cooking treatment (natural color) or high temperature and high humidity carbonization treatment (coffee color), to remove some sugar, starch and other extracts, and to add insect repellents and preservatives to eliminate insects , the growth of fungi.


When the natural color floor is bleached with hydrogen peroxide at 90 ℃, the bleaching time of the root with different wall thickness is different. 4-5mm3.5h, 6-8mm4h.


The carbon color floor is processed by twice carbonization procedure under high temperature and high pressure.


The secondary carbonization technology can carbonize the eggs, fat, sugar, protein and other nutrients in the bamboo to make the material light, the bamboo fiber is arranged in the shape of 'hollow brick', and the tensile and compressive strength and waterproof performance are greatly improved.


6. Drying

After cooking, the moisture content of bamboo slices is more than 80%, reaching the saturation state. The moisture content of bamboo directly affects the stability of the size and shape of the finished products after processing. In order to ensure the quality of bamboo floor products, the bamboo raw materials for processing need to be fully dried before gluing. Bamboo drying is to use drying kiln or track type drying kiln for drying treatment.


The moisture content of bamboo should be controlled according to the local climate and using environment. For example, the water content controlled in North China is different from that in South China. The water content requirements of products used in North China are very low, which should be controlled at 5-9% under normal conditions.


The moisture content of each unit of the bamboo floor, that is, the bamboo strip, is required to be uniform. For example, the moisture content of bamboo strips in the surface layer, middle layer and bottom layer is required to be uniform, so that it is not easy to deform and bend after the production of bamboo flooring.


This is also an important part to prevent the floor from cracking. The water content is uneven or too high. When encountering the change of temperature, dry humidity and other environmental factors, the floor may be deformed or cracked. The moisture content can be set according to the air humidity in different areas. The floor made in this way can ensure to adapt to the corresponding climate environment.


When drying the floor with good quality, it is tested by six points and many sides to ensure that the moisture content of each piece of bamboo strip, the head and tail of the bamboo strip, and the inside and outside of the bamboo strip are uniform, so as to ensure that the floor cracks and deforms due to the different humidity environment. It is difficult for consumers to simply determine the moisture content. The more safe way to solve this problem is to choose a regular bamboo floor manufacturer that can produce blank boards and has credibility.



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