The exhaust system of injection mold plays a vital role in the injection molding process.
First, the exhaust system helps to remove the air in the cavity. During the injection molding process, the molten plastic is injected into the mold cavity. If there is air in the cavity, air resistance will be formed during the flow of the plastic. These air resistances will hinder the normal filling of the plastic, resulting in defects such as lack of material, bubbles, and weld marks in the injection molded products. Through the exhaust system, the air in the cavity can be discharged in time to ensure that the plastic can smoothly fill the entire cavity, thereby improving the quality of the injection molded products. For example, when producing some thin-walled injection molded products, a good exhaust system can avoid product deformation and strength reduction caused by residual air.
Secondly, the exhaust system can reduce the injection pressure. When the air in the cavity is discharged, the resistance of the plastic during the filling process is reduced, and the injection pressure is also reduced accordingly. This can not only reduce the requirements for the injection molding machine and reduce the equipment cost, but also reduce the wear of the mold and extend the service life of the mold. At the same time, lower injection pressure can also reduce the shear force of the plastic during the flow process and reduce the molecular orientation of the plastic, thereby improving the mechanical properties of the injection molded product.
Furthermore, the exhaust system helps to improve production efficiency. A good exhaust system can make the plastic fill the cavity quickly and evenly, reduce the filling time and holding time, and thus improve production efficiency. In addition, the exhaust system can also reduce the scrap rate caused by poor exhaust and reduce production costs. For example, in large-scale production, an efficient exhaust system can significantly improve production speed and product quality, bringing greater economic benefits to the enterprise.
In addition, the exhaust system can also prevent the gas produced by the decomposition of plastics at high temperatures from affecting the injection molded products. Some plastics will decompose and produce gas due to high temperature during the injection molding process. If these gases cannot be discharged in time, defects such as black spots and silver wires will be formed in the injection molded products, affecting the appearance and performance of the products. Through the exhaust system, these harmful gases can be discharged from the mold to ensure the quality of the injection molded products.
For example, in an automobile parts manufacturer, the exhaust system of the injection mold has been carefully designed and optimized, which effectively improves the quality and production efficiency of the products. During the production process, technicians successfully solved problems such as product bubbles and weld marks by adjusting the size and position of the exhaust groove and adopting appropriate exhaust methods, providing a strong guarantee for the development of the enterprise.
In summary, the exhaust system of injection mold plays an important role in removing air from the cavity, reducing injection pressure, improving production efficiency and ensuring product quality. In the design and manufacturing process of injection mold, full attention must be paid to the design of the exhaust system to ensure the smooth progress of the injection molding process.
