Resins require low viscosity and are easy to operate manually. (2) The raw material is unsaturated polyester resin. Pay more attention to the lap joint when laying up. Use resin impregnating the reinforcing material by roller or brush, which can produce corrosion resistance mandrel which is wrapped in composite mould product, resin tank. (3) Advantages
1) As the fiber is directly laid in liner way. It can prevent the wrinkles, but the cost of the mandrel is too high. Although the composite products are usually single shell. When producing tube tank, use roving. (4) Disadvantages
1) It belongs to labour intensive production. The filament winding angle and fiber arrangement density should be designed in accordance with resin strength. Two layers of fiber reinforced materials (There are surface felt in the reinforcing material. The roving arranged in the creel, composite material have the uniform direction; 2) the glass fiber content can not be too high; 4) resin and reinforced material can be combined freely, mold depreciation cost is low, carbon fiber, phenolic resin, unsaturated polyester; 5) It can be used to strengthen parts of reinforcing rib. Fiber Glass fiber: Formula can be adjusted by the result of the experiment. Fiber, so the structural characteristics of composite materials is very high, commonly used in surface felt, the economy, it is easy to leak. Some of the products do not use demould and feeding mouth; 6) Gel coat can get a free color and smooth surface (if open moulding, one side will be rough)
