FRP/GRP TANK FILAMENT WINDING MACHINE
Fiberglass tanks are actually fiberglass reinforced plastic (FRP) — that is, they are plastic tanks that have been reinforced with fiberglass, similar to the way that rebar strengthens concrete.
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There are two methods for making these tanks: the chopper gun method and the filament winding method.
Chopper Gun Method
With the chopper gun method, the manufacturer uses metal molds to form the sides, top, and bottom of a tank. They do this by passing continuous strand of glass through a chopper gun, which cuts the glass into 3- to 5-inch pieces.Simultaneously,the gun mixes liquid resin and a hardener with the glass as it leaves the gun.
Filament Winding Method
A second option for making fiberglass tanks is called the filament winding method.with this method, the glass is wound around a rotating tank mold as a mat of long,continuous glass from a spool. The bottom of the tank is already attached to the sidewalls. Some companies hand apply a fiberglass mat around the seam created by the two pieces.
And instead of mixing resin and hardeners with the glass, the filament winding method only adds resin to the bottom of each layer. Rollers press the fiberglass mat in place and remove air bubbles. The number of layers of resin and glass that a finished tank has depend on its size.
