Gas-assisted injection molding process
Craftsmanship introduction
Gas-Assisted Injection Molding is an advanced forming technology that involves injecting high-pressure nitrogen during the injection process to assist plastic filling and form hollow structures. The core of the process involves partially filling the mold cavity with plastic, then injecting high-pressure gas into the center of the melt through a gas-assisted device. The gas pushes the melt to completely fill the mold cavity and maintains pressure during the holding phase, forming uniform hollow cross-sections. This technology effectively solves the common problem of sink marks in thick-walled areas such as ribs and reinforcing ribs in traditional injection molding, while significantly reducing injection pressure and clamping force requirements, achieving a synergistic improvement in lightweight and high performance.
With increasing demands for lightweight, high appearance quality, and cost control, traditional injection molding processes face many limitations when dealing with large thick-walled products. Through gas penetration and pressure maintenance, gas-assisted injection molding not only improves product surface quality and dimensional stability, but has also been widely adopted in medium and large components in automotive, home appliance, and furniture sectors, becoming an innovative solution for structural optimization and cost reduction.
Technical advantage
■ Eliminates Sink Marks and Enhances Appearance:
Effectively compensates for shrinkage in thick-walled areas through gas holding pressure, completely eliminating sink marks behind ribs and reinforcing features, achieving smooth and flat product surfaces
■ Reduces Equipment Requirements and Energy Consumption:
Significantly lowering injection pressure and clamping force, enabling the use of smaller tonnage injection molding machines and saving equipment investment and production energy consumption
■ Improves Dimensional Stability:
Uniform and gentle gas holding pressure significantly reduces internal stress in products, minimizing warpage and ensuring precise and stable product dimensions
■ Saves Material and Reduces Weight:
Hollow structures formed inside products, particularly suitable for large products with significant economic benefits