Views: 0 Author: Site Editor Publish Time: 2025-04-15 Origin: Site
GAIM works by partially filling the mold cavity with molten plastic, then injecting pressurized gas (usually 30–150 bar nitrogen) to push the material into the remaining space. The gas creates hollow channels inside the part, reducing weight while maintaining structural integrity.
Partial Plastic Injection (70–95% Fill)
The mold is partially filled with molten plastic, leaving room for gas expansion.
Gas Injection (Nitrogen N₂)
High-pressure gas is introduced through a gas nozzle, penetrating the molten plastic and pushing it into unfilled areas.
The gas follows the path of least resistance (hotter, less viscous regions).
Gas Packing & Cooling
The gas maintains pressure to compensate for shrinkage, preventing sink marks.
A hollow gas channel forms inside the part, reducing material usage.
Venting & Ejection
Gas is released, and the part is ejected.
Some residual gas may remain inside the part but is harmless (nitrogen is inert).
| Benefit | Description |
|---|---|
| Reduced Sink Marks | Gas pressure prevents shrinkage voids on thick sections. |
| Material Savings | Hollow structures reduce plastic use by 10–40%. |
| Faster Cycle Times | Gas cooling speeds up solidification vs. traditional methods. |
| Lower Clamping Force | Requires smaller injection machines, saving energy. |
| Improved Strength | Optimized gas channels enhance rigidity and durability. |
Gas Nozzles – Precision valves that inject gas into the mold.
Gas Control Unit – Regulates pressure, flow rate, and injection timing.
Specialized Mold Design – Ensures proper gas channel formation.
Automotive: Intake manifolds, door handles, dashboards.
Consumer Goods: Chair arms, tool grips, appliance housings.
Industrial: Pipes, fluid connectors, structural components.
| Factor | GAIM | Traditional Molding |
|---|---|---|
| Material Use | Less (hollow cores) | More (solid parts) |
| Cycle Time | Faster (gas cooling) | Slower |
| Surface Finish | Better (no sinks) | Possible defects |
| Tooling Cost | Higher (gas system) | Lower |
Gas-Assisted Injection Molding is ideal for thick-walled, high-strength, and lightweight plastic parts. By leveraging gas pressure, manufacturers achieve better quality, lower costs, and improved efficiency. As industries demand more sustainable and high-performance plastics, GAIM continues to grow as a key advanced molding solution.
