Filament winding process is the method adopted for manufacturing GRE pipes. In this process, supports are used for transporting glass fibres to the resin tray, in which the glass is impregnated by resin. It is then followed by the application of impregnated glass on a rotating mandrel (mould) at a specified angle. This winding process is continues till the time required wall thickness is achieved. Post the process of pipe curing with oven, a mechanically procedure (i.e. hydraulic pipe extractor) is applied for extracting the curing from mandrel. After cutting the pipe to required length, its ends are machined to create a joint configuration.
Advanced techniques like dual headed filament winding, hand layup and continuous filament winding process are used for manufacturing EPP pipes. Out of all the hi-tech procedures, advanced 2 axis and 4 axis CNC filament winding technology is implemented in GRP pipe. In this process, method for pipe fabrication involves roving of continuous glass strand which is helically wound around a rotating mandrel at an angle of 55° and pre-saturated in a resin bath.
Till the desired wall thickness is achieved, the winding process is continued in bi-directional layers. This winding angle of 55° will provide optimum 2:1, hoop to axial ratio. All the GRP pipes with filament winding is better than pipes manufactured with other methods like hand-layup, as they show better physical properties and have longer service life.
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