GAS-ASSISTED INJECTION MOLDING
By fully exploiting the ability of gas to transmit pressure uniformly and effectively, it breaks through the limitations of traditional injection molding, molding integral thick/thin-wall plastic parts in one shot, and brings a series of benefits such as weight reduction, cost saving, less warpage and lower clamp force.
Melt enters the cavity and, meeting the cooler mold wall, forms a relatively thin solidified layer.
Inert gas enters the molten plastic, pushing the unsolidified center material into cavities not yet filled.
Gas continues to push the melt flow until the melt fills the entire cavity.
Gas in the channel compresses the melt for compensation to ensure appearance; before mold opening, gas is exhausted, pressure drops to atmospheric.
Seven Advantages of Gas-assisted Molding
Gas-assisted injection can be applied to almost any thermoplastic (except very soft plastics) and some thermosets, roughly divided into three categories by part structure.
Large thick-wall parts such as handles, usually using hollow-injection gas-assisted process where gas penetrates the entire wall to form a channel. Design centers on the channel: near-circular cross-section, avoid sharp corners, length > 5× section height, inlet near gate with distance >30mm.
Large flat parts prone to warpage and local surface shrinkage. Ribs are often used as channels, placed at edges or wall corners; avoid thin dense ribs to prevent the "fingering" effect; channels distributed evenly and extended to the ends.
Parts with locally thicker sections where conventional methods easily cause sink marks, voids or distortion — adding a proper gas inlet at that location uses gas for molding and holding to avoid these defects.
A complete GAIM system consists of three parts: A high-pressure nitrogen source equipment, B high-pressure nitrogen transfer pipeline, and C gas-assisted pressure controller.
Includes imported screw air compressor, accumulative freeze dryer, filters — integrated design. After filtration, particle accuracy ≤0.01μm, oil removal ≤0.001mg/m³. Simple system, stable reliable quality, multi-point protection alarm.
PSA pressure-swing adsorption nitrogen unit using carbon molecular sieve dual-tower adsorption to extract high-purity nitrogen — large capacity, high purity, low noise. Widely used in aerospace, nuclear power, food & pharma, electronics, defense and special fields.
Diaphragm compression is a notably clean method of gas compression, essentially avoiding secondary contamination — used for flammable, explosive, toxic gases and high-pressure oxygen compression. Diaphragm compression in GAIM protects the sensitivity of the pressure controller, of great significance to product quality assurance.
The GPC series core components are all imported, consisting of pressure reducer, proportional solenoid valve, high-pressure servo valve, safety valve, etc. Fully Chinese interface, simultaneously displays set and actual gas-pressure-time curves, graded independent real-time correction, freely movable unit.
600+ Enterprises Long-term Cooperation (to date)
Since entering the market in 2011, we have cooperated with over 600 clients (to date), across Mainland China and the Taiwan region of China, as well as the Philippines, Iran, India, Jordan, Russia, Belarus, South Africa and beyond — covering electronics, home appliances, automotive, office and children's products.
Controlled overflow-well technology, material ABS etc. Ensures shell hardness/rigidity and outer-surface quality without repainting — lower cost, lighter weight.
Nylon 6, ABS etc. Components reduced from 22 to 14, effectively lighter and cheaper while meeting tolerance requirements.
PC/ABS etc. Flatness tolerance 0.1mm, stable dimensions, no sink marks; panel surface quality improved, productivity up, cost down.
Beach chairs, special-care bed side guards, stroller handles, etc. Weight can be reduced by nearly 50% (some parts), stiffness up, residual stress down, sink marks eliminated.
For complete technical presentations or product materials, please contact us by phone.