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Production process
There are three main types of FRP grating production processes: reciprocating fiber winding process, continuous fiber winding process and centrifugal casting process.
Reciprocating fiber winding process (belonging to the fixed-length method). In this process, the dipping tank reciprocates with the rotating mandrel, and the long fiber glass filaments are placed at a certain oblique angle relative to the mandrel axis. The angle (that is, the winding angle) is controlled by the ratio of the moving speed of the dipping tank and the rotation speed of the mandrel. The translational movement of the dipping tank is controlled by computerized electromechanical control. The number of winding layers is gradually increased until the designed wall thickness is reached. After winding is completed, the resin in the product is basically solidified. After curing, the mandrel is removed from the fiberglass tube.
Continuous fiber winding process (belongs to the continuous method) This process is that the pipe moves through a feeding station that supplies a mixture of resin pre-impregnated roving, chopped fiberglass fiber and resin sand. The pipe is continuously placed in the mandrel. Made by continuous progress.
Centrifugal casting process (belongs to the fixed-length method) In this process, cut glass fiber reinforced materials and sand are fed into a steel mold fixed on the bearing, and unsaturated resin with catalyst is injected into one end of the steel mold. Resin is used to impregnate the reinforcing material. Under the action of centrifugal force, the resin displaces the air in the fibers and fillers, thereby creating a dense composite material without pores. Due to the action of centrifugal force, the inner wall of the tube forms a smooth, smooth and resin-rich inner surface. layer, the pipe is cured at a higher temperature. The pipe made by this method is also called fiberglass sand-filled pipe.
There are many more manufacturers in the world that use the reciprocating fiber winding process to make pipes than the other two production processes. One of the reasons is that the fiberglass reinforced plastic pipes made by the reciprocating fiber winding process have a wider range of uses and have greater applicability. good.