The design of the exhaust system of the injection mold is a key link to ensure that the plastic flows smoothly in the mold and avoids defects and bubbles. The following is a detailed explanation of the design of the injection mold exhaust system:
First of all, the design of the exhaust system needs to take into account the flow characteristics of the plastic melt in the mold cavity. During the injection molding process, molten plastic is injected into the mold cavity under high pressure, and the air and volatiles in the mold cavity are also compressed. If these gases cannot be discharged in time, it will cause defects in the plastic melt during the flow process, such as bubbles, scorching, etc.
Secondly, the exhaust system usually consists of exhaust slots, exhaust holes, exhaust rods, etc. The exhaust groove is usually set at the parting surface of the mold or at the end of the melt flow to discharge gas in time. The width, depth and length of the exhaust groove need to be designed according to the specific conditions of the mold to ensure that the gas can be discharged smoothly without overflowing the plastic melt. The exhaust holes and exhaust rods can be used as means of auxiliary exhaust to further improve the exhaust effect.
When designing the exhaust system, the structure and materials of the mold also need to be considered. For example, for complex mold structures, multiple vent grooves or vent holes may be needed to ensure the venting effect. At the same time, the material of the mold also needs to consider its thermal conductivity and heat resistance to ensure that the exhaust system can work properly during the injection molding process.
In addition, the design of the exhaust system also needs to be combined with the characteristics of the injection molding process and plastic materials. Different plastic materials have different flows and volatilities, requiring different exhaust system designs. At the same time, parameters such as injection speed, pressure and temperature in the injection molding process will also affect the exhaust effect, so comprehensive considerations need to be taken when designing the exhaust system.
Finally, the design and implementation of an exhaust system requires experienced engineers and technicians. They need to make comprehensive considerations based on the specific conditions of the mold, plastic materials and injection molding process requirements to ensure that the exhaust system can effectively improve the quality and efficiency of the injection molding process.
