NANJING EFG CO., LTD., expert of wateproof frame materials
Hand lay-up: Hand lay-up is the main method of FRP production in my country. Fiberglass chopped strand mat, continuous mat and stitched mat can all be used in hand lay-up. The use of stitch-bonded felt can reduce the number of layers and improve the efficiency of hand lay-up. However, because the stitched felt contains more chemical fiber stitched threads, the bubbles are not easy to drive away, and the fiberglass products have more needle-like bubbles, and the surface feels rough and not smooth. In addition, stitched felt is a heavy fabric, and its covering ability is worse than that of chopped strand felt and continuous felt. When making products with complex shapes, it is easy to form voids at the bends. The hand lay-up process requires the mat to have the characteristics of fast resin penetration rate, easy elimination of air bubbles and good moldability.
Pultrusion: The pultrusion process is one of the main uses of continuous and stitched mats. Generally, it is used in combination with untwisted roving. Using continuous felt and stitched felt as pultruded products can significantly improve the hoop and transverse strength of the product and prevent the product from cracking. The pultrusion molding process requires that the mat has the characteristics of uniform fiber distribution, high tensile strength, fast resin penetration rate, good softness and mold filling, and the mat should have a certain continuous length.
RTM: Resin Transfer Molding (RTM) is a closed molding process. It is composed of two halves of a female mold and a male mold, a booster pump and an injection gun without a press. The RTM process usually uses continuous mats and stitched mats instead of chopped strand mats. The mat is required to have the characteristics that the mat should be easily saturated by resin, have good air permeability, good resistance to resin erosion and good mold covering.
Winding process: Chopped strand mat and continuous mat are generally used for winding molding and are mainly used as the resin-rich layer of the product, including the inner lining layer and the outer surface layer. The requirements of the winding molding process for the Fiberglass mat are basically similar to those of the hand lay-up method.
Centrifugal casting: Chopped strand mat is usually used as raw material. The chopped strand mat is pre-laid in the mold, and then the resin is added into the rotating open mold cavity, and the air bubbles are discharged by centrifugation to make the product compact. The mat is required to have the characteristics of easy soaking and good air permeability.
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