The forming process of the glass fiber tube is that the glass fiber is impregnated with resin, and then solidified in the high-speed polymerization device, which is integrated by light and electricity. Because of the different resin varieties used, it is called polyester FRP, epoxy FRP and phenolic FRP. It has the characteristics of light and hard, non conductive, high mechanical strength, anti-aging, high temperature resistance, corrosion resistance and so on.
With its unique advantages, glass fiber tube has been widely used in oil, electric power, chemical industry, papermaking, urban water supply and drainage, factory sewage treatment, seawater desalination, gas transportation and other industries. With the quickening process of urbanization in China, in the face of the balance and protection of population, resources and environment, governments at all levels have increased their investment in urban infrastructure year by year. In combination with the needs of advanced science and technology, the varieties and specifications of pipes and pipes are constantly enriched, the output is increasing, and the quality is continuously improved, especially the development of plastic pipes. Fast, become the hot spot of investment today. Glass fiber tube is one of them.
Main Features of Fiberglass Tube
1. The corrosion resistance is good.
Because the main raw materials of FRP are unsaturated polyester resin and glass fiber with high molecular composition, it can effectively resist the corrosion of acid, alkali, salt and other medium of corrosion and untreated sewage, corrosive soil, chemical wastewater and many chemical liquids. In one case, it can be kept safe for a long time. That’s ok.
2. good resistance to aging and heat resistance.
The glass fiber tube can be used for a long time at the temperature range of -40 to 70 C, and the special heat-resistant resin can also work normally at temperatures above 200 c.
3. The frost resistance is good.
Below zero 20 degrees Celsius, there will be no frost crack after freezing.
4. Light weight and high strength.
The relative density is between 1.5~2.0 and only 1/4~1/5 of carbon steel, but the tensile strength is close to, even more than that of carbon steel, and the specific strength can be compared with that of the high alloy steel. Therefore, it has achieved remarkable results in aviation, rockets, aerospace vehicles, high pressure vessels and other products that need to lighten their weight.
5. The design is good.
Various structural products can be flexibly designed to meet the requirements of use and make the products have good integrity.
6, good wear resistance.
The effect of rotating abrasion on water containing large amounts of mud and sand in pipes is tested. After 3 million rotation, the wear depth of the inner wall of the test tube is as follows: the steel tube coated with tar and enamel is 0.53mm, the steel tube with epoxy resin and tar coating is 0.52mm, and the steel tube treated by the surface hardening is 0.21mm. Therefore, the wear resistance of the glass steel is good.
7, good electric insulation.
Glass fiber reinforced plastic is a non conductor, the electrical insulation of the pipe is excellent, the insulation resistance is 1012-1015 Omega.Cm, it is the most suitable for transmission. The heat transfer coefficient of the dense area of the telecommunication line and the FRP of the multi mine area is very small, only 0.23, the 5/1000 of the steel, and the insulation performance of the pipe is excellent.
8, the friction resistance is small and the transport capacity is high.
The inner wall of FRP pipe is very smooth, roughness and friction resistance are very small. The roughness coefficient is 0.0084, while the n value of the concrete pipe is 0.014, and the cast iron pipe is 0.013.
Production process of fiber glass tube
There are mainly three types of glass fiber tube production processes: Reciprocating filament winding process, continuous filament winding process and centrifugal casting process.
The reciprocating fiber winding process (belongs to the fixed length method): in this process, the dipping groove is reciprocated with the rotating core mold, the long fiber glass wire is assisted by a certain inclined angle relative to the core mold axis, the auxiliary angle (that is the winding angle) is controlled by the ratio of the moving speed of the dipping slot and the ratio of the core mold speed. The translation movement of the soaking tank is computerized. The machine – electric control. The number of winding layers increases gradually until the wall thickness of the design is reached. After winding, the resin in the product is basically solidified. After curing, the core die is removed from the glass tube.
Continuous filament winding process (a continuous process): this process is a feeding station in which a pipe is preprepresoaked without twisting roving, short cut fiberglass fiber and resin sand mixture in motion. The pipe is made in continuous advance of the core mold.
The process of centrifugal casting (belongs to the fixed length method): in this process, the material and sand are reinforced with cut glass fiber and fed into the steel mould fixed on the bearing, and the unsaturated resin with catalyst is injected at one end of the die to impregnate the reinforced material and the resin is replaced with the air in the fiber and the filler under the action of centrifugal force. As a result of the centrifugal force, a smooth, smooth and smooth inner surface layer of the rich resin is formed, and the tube is cured at a high temperature. The tubes made by this method are also called glass fibre reinforced plastic sand pipes.
There are more manufacturers in the world using reciprocating fiber winding technology than the other two manufacturers. One of the reasons is that the fiberglass tube made from the reciprocating fiber winding process is more widely used and has better applicability.