Foaming (chemical foaming, physical foaming)
Craftsmanship introduction
Chemical foam injection molding is an advanced microcellular foaming technology. It introduces gas into the plastic melt to create a unique structure with a porous interior and a dense outer skin, thereby achieving product lightweighting and performance optimization.
In this process, precision-measured chemical foaming agents are uniformly mixed with plastic pellets and fed into the injection machine barrel. During heating and plasticization in the barrel, the foaming agent decomposes and releases gas.Under high pressure, this gas dissolves into the plastic melt,forming a single-phase mixture.When the melt is injected into the mold cavity, the sudden pressure drop causes the dissolved gas to rapidly expand, forming uniformly distributed, fine, closed-cell pores within the plastic.The entire process occurs under the tight constraints of the mold, ultimately producing a specialized component with an internal porous structure and a solid, smooth skin formed by rapid cooling upon contact with the cold mold surface.
Technical advantage
Chemical Foam Molding is an ideal process for manufacturing automotive components, including underbody panels and interior parts like door trims, as it simultaneously achieves lightweighting, performance enhancement, and cost efficiency. Here are the most significant Key Advantages:
■ Significant Weight Reduction with Structural Integrity
The internal microcellular structure reduces part weight while maintaining mechanical strength. Weight savings can reach 20%-30% for Class-A surface parts and 40%-50% for structural components.
■ Superior Overall Performance
Low Internal Stress & High Dimensional Stability: The foaming process counteracts material shrinkage, minimizing warpage and distortion.
Excellent Thermal & Acoustic Insulation: The closed-cell structure efectively blocks heat transfer and sound transmission, enhancing cabin comfort.
■ Notable Cost & Efficiency Benefits
Reduced Production Threshold: Lower required clamping force enables the use of smaller injection molding machines.
Improved Production Efficiency: Shorter cycle times increase production output.
Material Cost Savings: Direct reduction in raw material consumption lowers per-part cost.