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Fiberglass mat: It is a sheet-like product made of continuous strands or chopped strands that are not oriented by chemical binders or mechanical action.

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Usage requirements:

Hand lay-up: Hand lay-up is the main method of FRP production in my country. Glass fiber chopped strand mats, continuous mats and stitched mats 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 operations. However, because the stitchbonded felt contains more chemical fiber stitchbonding threads, the bubbles are not easy to drive away, and the FRP products have many needle-shaped bubbles, and the surface feels rough and not smooth. In addition, the stitched felt is a heavy fabric, and the mold coverage is shorter than that of the cut felt and the continuous felt. When making products with complex shapes, it is easy to form voids at the bend. The hand lay-up process requires the mat to have the characteristics of fast resin infiltration rate, easy elimination of air bubbles and good mold coverage.

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Pultrusion: The pultrusion process is one of the main uses for continuous and stitchbonded 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 products and prevent the products from cracking. The pultrusion process requires the mat to have uniform fiber distribution, high tensile strength, fast resin infiltration rate, good flexibility and mold filling, and the mat should have a certain continuous length.

RTM: Resin Transfer Molding (RTM) is a closed mold molding process. It is composed of two half-moulds, a female mold and a male mold, a pressurizing pump and an injection gun, without a press. The RTM process typically uses continuous and stitch-bonded mats rather than chopped strand mats. It is required that the felt sheet should be easy to be saturated with resin, good air permeability, good resistance to resin scouring and good overmoldability.

Winding process: chopped strand mats and continuous mats are generally used for winding and forming resin-rich layers mainly used as products, including inner lining layers and outer surface layers. The requirements for the glass fiber mat in the winding process are basically similar to those in the hand lay-up method.

Centrifugal casting molding: 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 dense. The drill piece is required to have the characteristics of easy penetration and good air permeability.

The unique production process of glass fiber surface mat determines that it has the advantages of flat surface, uniform distribution of fibers, soft hand feel, good air permeability, and fast resin infiltration speed. The specifications range from 15g/m² to 100g/m². Parts and shells are necessary supplies for FRP pipes and FRP products.

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Post time: Jun-17-2022