Due to the differences in the structure, shape, material properties and wood of bamboo, some processes and equipment still differ, taking the production of bamboo mat plywood as an example:
The production process of bamboo mat plywood is: bamboo mat preparation → drying → coating → blanking → aging → hot pressing → sawing → inspection → ordinary bamboo plywood. It can be seen that the process after the sawing is the same as that of the general plate, and the production process of each process before the hot pressing is different.
1. Preparation of bamboo mats: The bamboo weaving of bamboo plywood has two kinds of latitude and longitude seats and curtain hanging. The latitude and longitude mat is a bamboo mat woven from 1 to 1.5 mm thick bamboo. The curtain hangs are made of bamboo inner springs and are suspended as curtains in the form of curtains.
Second, the bamboo mat is dry: the drying method can be dried naturally or mesh belt dryer. The suitable moisture content of bamboo mat is 8-20%. If it is too low, the plate will be brittle, the fluidity of the resin will also be deteriorated, affecting the quality of the glue. If the temperature is too high, the hot pressing time will increase. It must be exhausted several times. The process is difficult to master. The color of the surface becomes black, which affects the physical and mechanical properties and appearance quality of the product.
3. Gluing: There are two kinds of gluing methods: manual gluing and gluing machine. The rubber used is phenolic and urea-formaldehyde. Practice has proved that the use of phenolic glue is better than urea-formaldehyde, but the cost is higher.
4. Chenhua: In order to make the glue fully infiltrate the bamboo mat and improve the quality of the glue, after the glue is applied, the bamboo mat should be placed for a period of time and then placed or assembled for a period of time and then hot pressed.
5. Billet: When producing bamboo plywood, the blank can be odd or even layer structure (wood plywood can only be an odd structure), and the warp and weft mixed bamboo plywood needs to be staggered.
6. Hot pressing: The suitable temperature, pressure and time for hot pressing vary according to the type of rubber and the number of layers. The temperature of the urea-formaldehyde glue is 120-125 ° C, the temperature of the phenolic glue is 130-140 ° C, the pressure of both is 2.5-4 MPa, the time is lengthened with the increase of the number of layers, and the time of the phenolic glue is longer.
Zinc coating is a type of protective coating that is commonly used on metal surfaces to extend their durability and prevent them from corroding or rusting. It involves the application of a thin layer of zinc onto the surface of metal parts through a number of processes, the most common of which is hot-dip galvanizing.
The benefits of zinc coating are many. It offers excellent corrosion resistance, making it ideal for outdoor applications where metal parts are exposed to harsh weather conditions. Zinc coating also provides a smooth and uniform finish, which enhances the appearance of the metal and makes it more visually appealing. In addition to this, zinc coating improves the overall performance of the metal part by increasing its resistance to wear and tear.
Zinc coating is used in a variety of industries and applications, including construction, automotive, and manufacturing. In the construction industry, it is used to protect steel structures such as bridges, buildings, and pipelines from corrosion. In the automotive industry, it is used to protect metal components such as car frames, exhaust systems, and suspension parts. In the manufacturing industry, it can be used to protect machinery and equipment parts from rust and corrosion.
In conclusion, zinc coating is a highly effective and versatile technology for protecting metal parts from corrosion and rust. Whether for outdoor or indoor applications, it offers numerous benefits in terms of performance and durability. As such, it is an essential process for enhancing the longevity and reliability of metal parts across a range of industries and applications.
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