Temperature Control in Small Appliance Injection Molding

Mastering the complete technology of injection molding in small appliance molds is crucial. The core of this engineering process lies in transforming plastic into products that retain their original properties. During injection molding, process parameters such as temperature, pressure, and timing significantly affect the plasticizing flow and cooling. The analysis can be primarily focused on the following three aspects:

1. Barrel Temperature: The required barrel temperature varies depending on different processing conditions. It mainly influences the plasticizing and flow of the material. Different types of plastics have specific flow temperatures, and even within the same type, variations in flow and decomposition temperatures can occur due to differences in source or grade. This is primarily due to differences in average molecular weight and molecular weight distribution. Additionally, different types of injection molding machines exhibit different behaviors during plasticization, making the selection of the appropriate barrel temperature essential.
2. Nozzle Temperature: Typically, the nozzle temperature is slightly lower than the highest barrel temperature to prevent drooling. When molten material passes through a direct-flow nozzle, the nozzle temperature should not be too low; otherwise, the material may solidify prematurely, leading to nozzle blockage or the injection of solidified material into the mold cavity, which can adversely affect the product’s performance. Therefore, an appropriate nozzle temperature is critical to ensuring product quality.

3. Mold Temperature: Mold temperature has a significant impact on the internal properties and surface quality of the product. It is arguably one of the most critical factors in the injection molding process. The mold temperature determines the crystallinity of the plastic, as well as the dimensions, structure, and performance requirements of the product. It is also influenced by other process conditions, such as melt temperature, injection speed, injection pressure, and molding cycle. Therefore, controlling the mold temperature appropriately is crucial for successful molding.

DAYIN Plastic Products Co., Ltd. specializes in the manufacturing of appliance molds and provides OEM/ODM services. As a comprehensive manufacturing solution provider, Daxin integrates R&D and manufacturing services. Our proprietary products include robotic vacuum cleaners, plastic tableware, and electronic dartboards. With 30 years of mold development experience, over 50 R&D personnel, and more than 100 injection molding machines, we are dedicated to delivering high-quality manufacturing services and creating value for our customers.