Compression molding, also known as compression molding, compression molding, etc., is the powder or loose granular solid plastic directly added to the mold, through the heating, pressurization method to make them gradually soften and melt, and then according to the shape of the mold cavity molding, cured into plastic parts, mainly used for molding thermoset plastics, can also be used for thermoplastics. Compared with injection molding, the advantage is that ordinary hydraulic presses can be used and the compression die structure is simple (no pouring system).