Plastic Compression Mold
It includes compression and injection moulding. They are mainly used to form thermosetting plastic molds, and the corresponding equipment is the pressure moulding machine. According to the characteristics of plastics, the mould is heated to the forming temperature (usually 103-108 degrees). Then the measured powder is put into the cavity and charging room of the mould to close the mould. Under the action of high heat and high pressure, the plastics are softened and viscous flow. After a certain period of time, the mould is solidified and shaped to become the required shape of the product. Different from compression moulding, injection moulding has a separate feeding chamber. Before moulding, the mould closes first, and the plastic preheates in the feeding chamber in a viscous flow state. Under the action of pressure, it is adjusted to squeeze into the die cavity and harden. Compression moulds are also used to form some special thermoplastics, such as thermoplastics (such as polyvinyl fluoride) blanks (cold pressing), resin lenses with high optical properties, slightly foamed cellulose nitrate steering wheel, etc. Compression mold is mainly composed of cavity, feeding cavity, guiding mechanism, pushing parts, heating system and so on. Injection moulds are widely used in packaging electrical components. The material used in the manufacture of compression moulds is basically the same as that of injection moulds.