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High-precision sensors are utilized to capture real-time variations in gas inlet and outlet pressure and temperature, enabling the establishment of dynamic pressure, temperature and time profiles. By correlating the acquired sensing data with molding quality results, the optimal processing parameters can be identified, thereby achieving stable product quality and high-yield manufacturing performance.
What is GAM Gas-Assisted Injection Molding?
Gas-Assisted Injection Molding (GAM) is an injection molding technology in which high-pressure gas—typically nitrogen—is injected into molten plastic. The gas pushes the molten material to fill the mold cavity and forms a hollow structure inside the part. This process helps reduce weight, shorten cycle time, and minimize deformation.
Molding Principle and Process？
Inject molten plastic into the mold for partial filling.
Inject high-pressure gas into the mold cavity before the polymer reaches its solidification point.
The gas pushes the plastic to expand throughout the mold cavity, forming a hollow structure.
Maintain gas pressure during cooling until the part solidifies.
Release the gas, open the mold, and remove the finished product.
GAM Equipment System Configuration
Protect equipment, reduce operating costs, and ensure stable production
・Control Unit (GAM Controller): Precisely controls gas pressure and injection timing
・Control Unit (GAM Controller): Precise controls gas pressure and gas injection timing
・Booster System: Nitrogen booster (ensures stable pressure supply)
・Gas drying and filtration equipment: Prevents impurities from entering the mold
・Dedicated modules and injection mold modification: Dedicated modules and injection mold modification
Six Key Advantages of GAM Molding Technology
1.Lightweight Design
Hollow structures reduce material usage and lower product weight.
2.Dimensional Stability
Effectively prevents sink marks and surface depressions.
3.Superior Surface Quality
Gas support balances internal pressure, reducing deformation and residual stress.
4.High Molding Efficiency
Shorter packing and cooling times accelerate production cycles.
5.Wide Application Range
Suitable for thick-wall parts, long-flow designs, and asymmetrical products.
6.Energy Saving & Carbon Reduction
Reduces plastic consumption and process energy usage, supporting green manufacturing.
Comparison Between GAM and Conventional Injection Molding
Frequently Asked Questions (FAQ)
Are all plastic products suitable for GAM?
Not all products are suitable. GAM is particularly ideal for thick-wall, hollow, structural, or deformation-prone plastic parts.
Will gas remain inside the product?
No. After the gas forms internal channels inside the mold cavity, it is released and does not remain in the final product.
Does adopting GAM technology require replacing existing equipment?
In some cases, mold modification or replacement may be required. With the addition of a GAM controller and gas system, the equipment can be integrated and used for production.