The appearance quality of home appliances primarily depends on exterior components. Nowadays, home appliances are subject to increasingly stringent appearance requirements, sometimes necessitating the use of complex-shaped exterior parts. To enhance product aesthetics, traditional processes require secondary spray painting after molding, which increases assembly costs. For instance, the air purifier cover adopts an integrated structural design, demanding higher stability in the mold structure. Meanwhile, to eliminate spray painting for cost reduction, a painting-free process must be employed to improve product texture, further increasing process difficulty.  

The details of the purifier plastic mold are as follows：

Steel material	S50C, 718H, etc.
Standard parts	Punch, Misumi
Mold Base	Made-to-order
Number of cavities	1X1

Injection molding machine tonnage

1800T

Mold life

300,000 times

 

1. Eliminating Surface Defects Through a Painting-Free Process  

The painting-free process effectively resolves appearance issues, avoiding flow marks and other surface defects. Based on product appearance requirements, CAE simulation analysis is continuously optimized to determine the optimal gate location while ensuring weld lines do not appear on visible surfaces. We have established a standardized gate design methodology for painting-free materials to prevent flow marks and enhance surface quality.

  2. Integrated Structural Molding for Stable Production  

The product features a one-piece structure, so the mold design must accommodate integrated molding and ensure smooth demolding. Through innovative mold structure analysis and optimization, production stability is guaranteed while meeting structural integrity requirements.