There are three main types of FRP production process: reciprocating filament winding process, continuous filament winding process and centrifugal casting process.
Reciprocating filament winding process (belongs to fixed length method): In this process, the dipping trough moves reciprocating with the rotating mandrel, the long fiberglass filament is placed with a certain oblique angle relative to the mandrel axis, the auxiliary angle (i.e. the winding angle) is controlled by the ratio of the moving speed of the dipping trough to the rotating speed of the mandrel, and the translation motion of the dipping trough is computerized. Mechanical-electrical control. The number of winding layers increases gradually until the designed wall thickness is reached. After winding, the resin in the product is basically cured. After curing, the core die is removed from the FRP pipe.
Continuous filament winding process (belongs to continuous method): The process is that the pipe is made in the continuous progress of the core mould through a feeding station for resin prepreprepreg twistless roving, short cut fiberglass reinforced plastic fiber and resin sand mixture in motion.
Centrifugal casting process (belongs to fixed length method): In this process, cut glass fiber reinforced material and sand are fed into the steel mould fixed on the bearing, and unsaturated resin with catalyst is injected into one end of the steel mould to impregnate the reinforcing material. Under the action of centrifugal force, the resin replaces the air in the fiber and filler. The pore-free compact composite material is manufactured. Because of the centrifugal force, a smooth and smooth resin-rich inner surface layer is formed on the inner wall of the pipe, and the pipe solidifies at a higher temperature. The pipe manufactured by this method is also called FRP sandwich pipe.
There are more manufacturers using reciprocating filament winding process than the other two processes in the world. One of the reasons is that the FRP pipe manufactured by reciprocating filament winding process has a wider use and better applicability.
1 化学介质输送管 2 各类工艺馆（化学工艺，造纸工艺，污水处理工艺，海水淡化工艺，食品及饮料加工工艺，医药工艺等） 3 地面上小型水电站压力水管，发电厂循环水管 4 污水收集及输送管道 5 饮用水输送干线管及配水管 6 油田注水管及原油输送管 7 热能输送管，海水输送管 8 农机灌溉用管 9 真空管，外压管和虹吸管 1 chemical medium conveying pipe 2 all kinds of Craft Museum (chemical process, the papermaking wastewater treatment process, seawater desalination technology, food and beverage processing, pharmaceutical technology) 3 small hydropower stations on the ground pressure pipe, circulating water power plant 4 sewage collection and transportation pipeline 5 drinking water delivery main pipe and 6 oil pipes water injection and oil conveying pipe 7 heat pipe, water conveying pipe 9 vacuum tube tube 8 of agricultural irrigation, external pressure tube and rainbow Straw