How to Ensure the Appearance Quality of Injection Molded Shells
The appearance quality of the injection molded shell directly affects the overall quality and user experience of the product. In order to ensure an excellent appearance of the injection molded housing, it needs to be tightly controlled from several stages.
1. Mold Design and Manufacturing
Cavity Polishing: Fine cavity polishing can effectively reduce the surface roughness of the mold and improve the gloss of the product surface.
Cooling system design: Reasonable cooling system design can control the shrinkage and deformation of plastic parts, and reduce defects such as warpage and shrinkage.
Exhaust system design: A good exhaust system can effectively prevent defects such as airlines and sink marks on the surface of the product.
Mold material selection: Choose mold steel with good wear resistance and strong corrosion resistance to prolong the life of the mold and ensure the long-term stable appearance quality of the product.
2. Injection molding process parameter control
Injection pressure: If the injection pressure is too low, it will cause defects such as shrinkage marks and flow marks on the surface of the product, and if it is too high, it will be easy to produce flash and burr.
Injection speed: If the injection speed is too fast, it is easy to produce bubbles, weld lines, and other defects, and if it is too slow, it will lead to a rough surface of the product.
Melting temperature: If the melting temperature is too low, it will lead to insufficient fluidity of the plastic parts, resulting in defects such as shrinkage and lack of materials, and if it is too high, it will be easy to decompose and discolor.
Holding Time and Pressure: Too short or low holding time and pressure can easily cause shrinkage and voids, while too long or high holding time and pressure can easily generate stress, leading to product deformation.
3. Material Selection
Material Fluidity: Choosing materials with good fluidity can reduce defects such as weld lines and shrinkage, and improve the surface finish of the product.
Material Shrinkage Rate: Choosing a material with stable shrinkage can reduce product deformation and improve dimensional accuracy.
Heat Resistance of Material: Choosing materials with good heat resistance can improve the service life of the product.
4. Maintenance of Injection Molding Machine
Regular maintenance: Regular maintenance of the injection molding machine to ensure stable operation of the injection molding machine, reduce the occurrence of failures, and improve product quality.
Cleaning of screws and barrels: Clean the screws and barrels regularly to prevent impurities from entering the cavity and affecting the surface quality of the product.
5. Product post-processing:
Polishing: Polishing the product surface can improve the gloss of the product.
Coating: Coating the product surface can increase the wear resistance, and corrosion resistance, and improve the appearance of the product.
