Transfer molds are also called injection molds or extrusion molds. The molding process of the mold is characterized in that the plastic raw material is added into the preheating charging chamber, and then the pressure is applied to the plastic raw material in the feeding chamber by the pressing column. The plastic is melted under high temperature and high pressure and enters the cavity through the casting system of the mold, and then Chemical cross-linking occurs and gradually solidifies. The transfer molding process is mostly used for thermosetting plastics, and it can form plastic parts with more complicated shapes.
4. Extrusion die
The extrusion die is also called the extruder head. The mold can continuously produce plastics with the same cross-sectional shape, such as plastic pipes, rods, sheets, and the like. The apparatus for heating and pressurizing the extruder is the same as that of the injection machine. The molten plastic passes through the machine head to form a continuous molded part, which is particularly efficient.
In addition to the types of plastic molds listed above, there are vacuum forming dies, compressed air dies, blow molding dies, low foaming plastic dies, and the like.