The compression molding process can be divided into the following types according to the reinforcement material state and the molding material variety:
(1) Fiber compression molding method: The pre-mixed or pre-impregnated fibrous molding material is put into a metal mold to form a composite material product under a certain temperature and pressure.
(2) Compression molding method of crushed fabric: cut the scraps of glass fiber fabric or other fabrics impregnated with resin glue, such as linen, organic fiber fabric, asbestos fabric or cotton fabric, etc., and then heat and press shape Composite products. This method is suitable for forming products with simple shapes and general performance requirements.
(3) Fabric compression molding method: Two-dimensional or three-dimensional fabrics woven into a desired shape in advance are impregnated with resin glue, and then placed in a metal mold to form a composite material product under heat and pressure.
(4) Lamination compression molding method: Cut the glass fiber cloth or other fabric pre-impregnated with resin glue into the desired shape, and then form the composite material product by heating or pressurizing in the metal mold.
(5) Winding compression molding method: continuous fibers or cloth (belt) pre-impregnated with resin glue are provided with a certain tension and temperature by a special winding machine, wrapped around the core mold, and then placed in the mold for heating and pressure Molded composite products.
(6) Sheet plastic (SMC) compression molding method: Cut the SMC sheet according to the product size, shape, thickness and other requirements, and then stack the multilayer sheets into a metal mold to heat and press the molded product.
(8) Directional auxiliary compression molding: Orient and lay the unidirectional prepreg products in the main stress direction, and then press molding.
(9) Molding powder compression molding method: The molding powder is mainly composed of resin, filler, curing agent, colorant and mold release agent. The resins are mainly thermosetting resins (such as phenolic resins, epoxy resins, amino resins, etc.). Thermoplastic resins with high molecular weight, poor fluidity, and high melting temperature that are difficult to inject and extrude can also be made into molding powder.
(10) Adsorption preform compression molding method: Adsorption method (air adsorption or wet slurry adsorption) is used to pre-form glass fiber into a preform similar to the structure of the molded product, and then place it in the mold and on it Pour in resin paste and mold under a certain temperature and pressure. The material cost of this method is lower, longer chopped fibers can be used, which is suitable for forming products with more complicated shapes, which can be automated, but the equipment cost is higher.
(11) Bump molding compound compression molding method: Bump molding compound (BMC) is a fiber-reinforced thermosetting plastic, and is usually composed of unsaturated polyester resin, chopped fiber, filler and various additives. A lump prepreg after thorough mixing. Low shrinkage additives are added to BMC, which greatly improves the appearance performance of the product BMC.
(12) Felt compression molding method: This method uses resin (mostly phenolic resin) to impregnate the glass fiber felt, then dry it into prepreg, cut it into the desired shape and place it in the mold, heat and pressure to form product. This method is suitable for forming thin-walled large-scale products with simple shapes and little change in single thickness.
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