It is formed by glass fiber after extrusion.
You can dip winding roving into resin and demould it after curing, then geogrids mould is formed.
Production technology, there are mainly three konds of glass?reinforced?plastics grating production process: Peciprocating filament winding process, continuous filament winding process and casting process. Reciprocating filament winding process(belongs to fixed-length method): In this process, the leaching glue tank with rotating mandrel reciprocate and the long glass silk with a certain angle works as auxiliary. Auxiliary angel (the winding angle) is controlled by the moving speed of leaching glue tank and the speed ratio of mandrel and translational motion of leaching glue tank is controlled by computerized electric machine. The layer number of twisting is gradually increased to meet the thickeness of design wall. After winding is completed, resin in products should be solidified and then form mandrel from glass reinforced tube. Continuous filament winding process (belongs to continuous method) The process is that pipe pass through a feeding station which is to supply resin presoak roving, chopped glass reinforced fiber, resin sand mixture. then pipe formed in the continuous progress of mandrel. Casting process (belongs to fixed-length method) In this process, chopped glass fiber reinforced materials and sand are put into the steel mould fixed in bearing, then unsaturated resin used as catalyst is added into one side of steel mould to dip reinforced materia. Under the effect of centrifugal force, the resin exchange fiber and filler in the air so as to create a nonporous compact composite material and a smooth, bright and clean pipe surface layer with rich resin. steel tubes start to curing under high temperature. Pipe produced in this way is also called glass reinforced plastic sand pipe. In the world, the number of manufacturers using reciprocating filament winding process to produce tube is more than that of the rest two production technology. One of the reasons is is that the former has a wider range of usage and its applicability is better.
