Process technology and main classification of bamboo rubber sheet products
After years of research, bamboo rubber sheets have been formed into more than 20 major categories, which are widely used in high-rise buildings, overpass viaducts, and tunnel culvert formwork. They are also used in mobile homes, train car floors, container floors, and home decoration panels. The main templates are now introduced.
==Bamboo plywood ==
It is made by bonding the thick bamboo pieces with grooves to form the unit. The bamboo pieces are prepared by the flat planing method. The "high temperature softening of the bamboo material" is the technical feature of the product. Bamboo plywood can be used as a common structural board or as a car floor by sheet length and surface treatment.
Process characteristics:
1. Preparation of thick bamboo with grooves, etc. The large-diameter bamboo is cross-sectioned into bamboo segments. After milling the outer section, it is longitudinally divided into 2-4 pieces, and then milled to the inner section for cooking and softening, and then in the upper pressing type. The layer flat press is heated and pressurized to expand the curved bamboo into a flat surface. Finally, it is processed into a thick bamboo piece without bamboo green or bamboo yellow by double-sided planing.
2. Stereotype drying In order to prevent the bamboo sheet from being curled and deformed under the lateral elastic restoring force during the drying process, it is necessary to use the pressure drying method and equipment to make the wet bamboo sheet heated under pressure. Exclude moisture and free shrinkage when under pressure.
3, bamboo sizing color using a four-roller coating machine on the bamboo roll coated with water-soluble phenolic resin, the amount of glue is 300-350g /? (double-sided). 1% to 3% of flour, soy flour, etc. may be added to the adhesive as a filler. The filler can easily form a film on the surface after the glue is applied, and it is not easy to produce a glue phenomenon when hot pressed, and the brittleness of the glue layer can be improved after curing.
4. The blank is made of manual blank, and the blank is strictly in accordance with the principle of symmetry, the principle of odd layer and the principle that the texture of adjacent layers of bamboo is perpendicular to each other. The panel is required to be made of a good-quality bamboo piece, and the material of the second piece is used as a backing plate. The bamboo green of the surface and the back plate faces outward, and the bamboo yellow faces inward; when the core plate is assembled, the orientation of the adjacent bamboo pieces is required to be alternately arranged according to the bamboo green surface and the bamboo yellow surface.
5, pre-compression and hot pressing (1) pre-compression In order to prevent the slab from being displaced into the hot press machine, the core, the seam and other defects caused by the displacement, before the hot pressing of the blank, the slab is Pre-pressing at room temperature allows it to bond into a unitary material.
(2) The hot pressing adopts a hot-hot bonding process, the hot pressing temperature is about 140oC, the unit pressure is 2.5-3.0MPa, and the hot pressing time is calculated according to the thickness of the finished product, generally 1.1min/mm.
In order to prevent the "bubbling" phenomenon, a three-stage depressurization process is usually employed in the late stage of hot pressing. The first section is reduced from the working pressure to the "balanced pressure", the second section is reduced to "zero" by the "balanced pressure", and the third section is completed from zero to the hot platen.
6. Plate length and surface treatment Bamboo plywood is mainly used as the floor of the car. Therefore, the length of the plate is required to be consistent with the length of the car, and the pressed plate is shorter, so it needs to be lengthened.
The length and surface treatment of the sheet includes end milling bevel, bevel coating and lap joint, thermocompression length, longitudinal trimming, panel coating and overlay screen, and hot pressing to cure the panel Press out the process such as mesh marks.
==竹篾层æ==
Bamboo slabs are structural materials with a particularly high longitudinal strength and good rigidity. The product has significant directionality and its structure is similar to that of recombinant bamboo or recombinant wood. It is mainly used as the floor of the car and is a good substitute for wood.
Process characteristics:
1. The bamboo raft requires a bamboo raft thickness of 0.8-1.2? and a width of 10-20?, and the length of the bamboo raft depends on the length of the product. By drying in a natural drying or drying kiln, the moisture content of the bamboo raft is below 15%.
2, dipping and drying bamboo rafts should be tied into small bundles before dipping, bamboo simmer dipping in two ways: periodic and continuous. In the periodic dipping, the bundled bamboo rafts are placed in the dipping frame, and the dipping frame is placed in the dipping tank by a single beam hoist, and the water-soluble phenolic resin glue is impregnated. Continuous dipping is to hang a bundle of bamboo rafts on a special transport machine. As the conveyor moves, the bamboo rafts are passed through the dipping tank to complete the dipping and dispensing process.
3. Slab paving In order to control the uniformity of the density and thickness of the sheet, the weight of the bamboo slab required for the slab is first calculated. After weighing, the bundled bamboo rafts are placed in parallel in the forming frame of the slab and laid evenly. The slab is then bundled with a packing tape and the frame is removed. The uniformity of the pavement has a great influence on the quality of the board and must be handled carefully.
4, hot pressing hot pressing usually uses a cold-hot-cold process.
The bamboo slabs are made of bamboo stalks and the slabs are made of bamboo stalks. As a unit of bamboo rafts, there is no need for precise and cumbersome machining, and there is no need for woven curtains, so there are fewer production processes and high utilization of bamboo. The advantages of equipment investment province. And the product has high longitudinal strength, impact resistance, wear resistance, corrosion resistance and weather resistance, but it also has the following problems and deficiencies.
(1) There is no lateral bamboo raft in the structure of bamboo slabs. Only when the density of the slab is about 1.1g/cm3 and the thickness is more than 25mm, it can be used as a structural material. If the production density is low, the thinner sheet will be unusable because the lateral strength is too low. Moreover, the sheet is also prone to warp deformation in the width direction. For this purpose, a wide sheet of material is longitudinally cut into narrow strips to reduce the amount of deformation. Therefore, the application range is small, and it is mainly used as a car floor.
(2) The length of the product depends on the length of the bamboo pole. If it is used as a special component such as the floor of the car, it must pass through multiple long processing steps, which not only increases equipment investment and processing cost, but also the strength of the joint is only the body. About 70% of the strength. In addition, the slender bamboo rafts are inconvenient for production operations, transportation and storage due to their poor rigidity and unevenness, and it is impossible to mechanize and continue the production process.
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