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First off, let's talk about the production methods for FRP materials. Broadly speaking, they can be categorized into two main groups: the wet contact type and the dry pressure forming method. Depending on the specific techniques involved, you’ll find processes like hand lay-up, lamination, RTM (Resin Transfer Molding), pultrusion, compression molding, and winding molding. Hand lay-up itself encompasses various sub-methods such as hand lay-up, bag pressing, spraying, wet paste low-pressure molding, and moldless paste.
Today, there are four primary molding methods widely utilized around the globe. One is the hand lay-up method, which remains particularly popular in countries like Norway, Japan, the UK, and Denmark. Products made using this technique include FRP fans. Another method is the injection molding approach, commonly adopted in countries such as Sweden, the US, and Norway. Then there’s the compression molding method, primarily used in Germany. Lastly, the RTM method (Resin Transfer Molding) is widely employed in Europe, the US, and Japan.
In addition to these, other methods such as filament winding, pultrusion, and hot potting are also quite common. In China, over 90% of FRP products are manufactured via the hand lay-up method, while other techniques like winding, lamination, and others account for the rest. Interestingly, even in Japan, the hand lay-up method still makes up about half of their production. Globally, the hand lay-up method continues to hold a significant share, suggesting that it still has strong staying power. This method is known for its simplicity—it involves molding with a wet resin, requires minimal equipment, and is relatively inexpensive. Moreover, it allows for creating large components, some reaching lengths of 10 meters or more in one go. However, it suffers from low levels of mechanization, longer production cycles, and inconsistent quality. Recently, China has imported advanced machinery like extruders, sprayers, and winders from abroad. As the FRP industry evolves, we can expect new methods to keep emerging.
Wood Screw
Wood Screw
Hebei Qianmu Fastener Manufacturing Co., Ltd , https://www.qmjgjfasteners.com