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What are the forming processes of FRP?

Oct 11, 2019

According to the material characteristics of FRP, the main manufacturing processes are winding molding, drawing molding, hand paste molding.
The winding forming is carried out under the mutual cooperation of the rotating mandrel, the support roller and the steel belt, and the size of the actual produced pipe is set according to the requirement of the pipe diameter. First, a layer of adhesive tape is wound on the rotating mandrel. Secondly, with the addition of glass fiber filament, resin and outer winding yarn, the yarn is evenly distributed in the appropriate position of the rotating mandrel. In the process, the excess resin is scraped off, then wrapped in a layer of polyester surface felt, and the product is removed from the mold after winding. Finally, it is cured at a certain temperature.

Razor forming is the installation of fiberglass filament on the yarn frame, fiberglass filament through the guide roller traction, into the resin slot, so that each fiberglass filament is impregnated with resin.
The fiber filament dyed with the resin passes through the preforming die, which is a guiding device configured according to the cross-section shape required by the product. The excess resin and bubbles are discharged from the preforming die and then entered into the molding die. Glass fiber filament and resin are cured at high temperature. It is then pulled out by the traction device and cut to the desired length by the cutting device.
Molding is to mix a certain amount of fiberglass fabric with resin, pour it into the metal grinding tool, apply a greater force with the hydraulic press, gradually solidify it under pressure and temperature, and take out the product from the mold.
Hand paste molding is to brush the mold with a resin mixture containing curing agent, then lay a layer of cut fiber fabric, use a brush to evenly spread the fiber on the mold, and pile up the fiber fabric several times until the desired thickness is reached. It is then heated and solidified under pressure.