FRP pipes can be divided into three layers: liner layer, structural layer and outer anti-aging layer. The liner layer featuring excellent corrosion resistance, can effectively prevent seepage; while, the structural layer can reinforce the FRP pipe by improving its rigidity and strength. And the outer anti-aging layer is characterized by excellent resistance to aging, corrosion as well as UV.
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Filament winding, as the most extensively method, is generally used to manufacture FRP pipes such as pressure pipes, drainage pipe and chimney pipes. Here is a simple introduction of FRP pipe manufacturing process.
Mandrel preparation.
Clean and polish the mandrel to ensure a smooth surface without any potholes, dust, debris or other fixtures affecting the quality of FRP pipes. Then wrap a thin mylar parting film around the mandrel to make the pipe extraction much easier.
Machine & material preparation.
Check up on the equipment and make sure it is operating properly, especially resin and curing agent are in correct composition and the dual pump performs well without any clogging. All of this is to ensure high precision and stable operation of your equipment.
Liner production.
Liner curing.
The liner layers are cured through far infrared depth curing process to enhance solidification degree and improve anti-corrosion properties.
Liner inspection.
Check the pipe again to ensure liner layers in manufactured without bubbles, impurity, white patch, part curing phenomena. Most all, ensure the liner layer is qualified with reasonable resin ratio.
Filament winding.
The filament is automatically impregnated in the resin tank, and then reciprocating winded around the rotating mandrel at a specific angle. Normally, different helical angles impart different strength in the hoop or axial direction as required.
Pipe curing.
After the filament winding process, FRP pipes are far infrared cured about 1 hour to 2 hours based on weather condition. Meanwhile, the mandrel rotates at an even speed to ensure the pipe is cured evenly.
Trimming & extraction.
When the Barcol hardness of the FRP pipe is more than 30, then trim the pipe and separate it from the mandrel.
Pipe testing.
Test the pipe through following aspects:
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Three different processes are commonly used to fabricate fiber reinforced plastic pipe: centrifugal casting, filament winding, and hand lay-up. Filament winding and centrifugal casting are used to make pipe up to approximately 12 inches in diameter, with filament winding being the most common. Hand lay-up is generally used for larger diameter pipes, and for asymmetric shapes.
The centrifugal casting process involves layering glass cloth on the inside walls of a tubular mold which is rotated at high speed. Catalyzed liquid resin is then injected into the rotating mold. Centrifugal force ensures that the reinforcing fibers are thoroughly saturated with resin and serves to drive out air bubbles that might compromise the physical properties of the pipe. The mold continues to rotate while the resin cures.
In filament winding, continuous fiberglass filaments, called rovings, are saturated with catalyzed liquid resin and helically wound around polished steel mandrels. Typically, the fibers are fed through a mechanical device that moves up and down the length of the rotating mandrels. The resin is then cured at elevated temperatures and the finished pipe is removed from the mandrel.
Filament winding results in the highest fiber-to-resin ratio of the three fabrication methods and consequently offers the highest strength-to-weight ratio. This is the method used by Waco Boom.
As the name suggests, hand lay-up is a manual fabrication process. It involves building up layers of chopped glass or woven glass mat impregnated with catalyzed resin around a suitable mold. Special metal rollers are used to improve glass wet-out and force out trapped air bubbles. Hand lay-up is generally used only for custom shapes or for large-diameter pipe where filament winding or centrifugal casting is not practical.
Our Yongchang glass fiber reinforced plastic / FRP pipes are designed and manufactured according to customer requirements, with various sizes and configurations. We can manufacture pipelines of any specification and pressure and can be made into composite pipelines such as PVC/FRP, PP/FRP, PVDF/FRP, etc., according to the conditions of use. If you are interested in our products, please contact us for more information.
Contact us to discuss your requirements of frp pipe manufacturer. Our experienced sales team can help you identify the options that best suit your needs.