The SMC sheeting machine is primarily used for the production of unsaturated polyester glass fiber reinforced sheet molding compound. It involves impregnating glass fiber yarn on both sides of a polyester paste mixed with resin, filler, pigment, release agent, etc., with a thin film to form a "sandwich structure." This creates "sheet molding compound" in a "coiled" or "folded" form and allows for the production of sheet materials with varying strength requirements using glass mats, glass fabrics, and定向 yarns.