What are the applications of gas assisted injection molding in electronic products?

一, Technical principles and core advantages
The core of gas assisted injection molding lies in the mechanism of "gas displacement of melt": high-pressure nitrogen gas is injected when the mold is filled with 75% -99.9%, and the gas flows along the path with the minimum resistance, hollowing out the thick walled area to form a hollow structure, while pushing the melt to fill the remaining cavity, and finally compensating for shrinkage through gas pressure holding. This process has brought about three major technological breakthroughs:
Structural optimization capability: Achieving uniform cooling of parts with wall thickness differences through airway design, eliminating internal stress concentration caused by uneven thickness in traditional injection molding. For example, after using gas assisted technology, the arch deformation of the TV front frame is reduced from 1.7-2mm to below 0.5mm, meeting the assembly accuracy requirements of large screen TVs over 64 inches.
Material efficiency improvement: The hollow structure reduces raw material consumption by 10% -40%, while reducing the need for mold locking force, allowing products weighing 30 grams to 18 kilograms to be produced on small tonnage machines. After adopting gas assisted air conditioning for a certain brand of air conditioning fan panels, the cost of individual materials decreased by 18%, saving over 200 tons of raw materials annually.
Surface quality breakthrough: Gas pressure maintenance eliminates shrinkage defects, and the surface smoothness reaches the mirror level standard. In the manufacturing of mobile phone cases, the gas assisted process reduces the occurrence rate of weld lines from 35% to within 2%, and increases the yield rate to 99.2%.
二, Deep application in the field of consumer electronics
1. Revolution in Television Shell Manufacturing
Under the trend of popularity of large-sized televisions, gas assisted technology has become the key to solving the problem of forming ultra-thin casings. The front frame of Panasonic's 65 inch OLED TV in Japan adopts gas assisted technology, which designs gas channels at the root of the reinforcing ribs to achieve:
Wall thickness reduced from 4.5mm to 2.8mm, weight decreased by 32%
The molding cycle has been shortened from 78 seconds to 45 seconds
The surface flatness error is controlled within ± 0.1mm
This case shows that gas assisted technology increases the design freedom of TV casings by 40%, supporting more aggressive curved surfaces and irregular structures.
2. Innovation in laptop structural components
The Lenovo ThinkPad X1 Carbon series uses gas assisted injection molding to manufacture palm rest components, and achieves product upgrades through the following technological innovations:
Airway network design: Constructing three-dimensional gas channels in carbon fiber reinforced plastic to increase overall stiffness by 25%
Local reinforcement technology: Implement secondary gas injection in the keyboard support area to form a local solid structure that can withstand a pressure of 20kg without deformation
Synergistic surface treatment: The combination of gas assisted hollow structure and nano coating technology enables the wear resistance of the palm rest to reach 5000 times of friction without scratches
3. Precision components for smartphones
Gas assisted technology demonstrates unique value in the manufacturing of mobile phone frames:
The Huawei Mate series uses gas assisted technology to produce metal plastic composite frames, and achieves 0.05mm level microstructure molding through gas pressure control
The camera decoration ring of Xiaomi 14 Ultra adopts surface gas forming technology (EGM) to achieve a high gloss surface without shrinkage marks on a 0.3mm thick PC material
The Samsung Galaxy Z Fold series hinge bracket adopts gas assisted injection molding+LDS laser direct molding technology, which reduces antenna signal loss by 1.2dB
三, Expansion and application in the field of home appliances and electronics
1. Optimization of air conditioning duct system
Gree's "Wind Unbounded" series air conditioners use gas assisted injection molding to manufacture cross flow impellers:
Hollow blade design increases air volume by 15% while reducing noise by 3dB (A)
Integrated design of gas channel and flow channel, reducing 4 assembly processes
The lifespan of the mold has been extended from 150000 times to 500000 times, and the cost of a single mold has decreased by 60%
2. Upgrade of refrigerator interior parts
Haier's full space fresh-keeping refrigerator uses gas assisted technology to produce door core components:
By optimizing the airway layout, the rigidity of the door body is increased by 30%, and the fluctuation of the opening and closing force is controlled within ± 0.5N
The combination of matte surface treatment and gas assisted hollow structure achieves anti condensation effect, reducing the condensation rate from 12% to 0.5%
Single refrigerator door liner manufacturing reduces energy consumption by 22% and reduces annual carbon dioxide emissions by 180 tons
3. Innovation of washing machine control panel
The Little Swan Ultra fine Bubble Washing Machine adopts gas assisted injection molding to manufacture the operation panel:
Dual color injection molding+gas assisted hollow structure reduces panel thickness from 3.2mm to 1.8mm
Gas pressure maintenance eliminates shrinkage marks in the button area, achieving a 98% consistency in tactile feedback
The panel transmittance has been increased to 85%, supporting finer backlight display solutions
四, Technological development trends and challenges
1. Breakthrough in micro nano gas assisted technology
The current research focuses on 0.1mm level micro airway control, through:
Nano scale gas needle development (aperture<50 μ m)
Supercritical nitrogen application (pressure>70MPa)
Optimization of Microfluidic Simulation Model
Realize the manufacturing of ultra precision components such as smart watch crowns and AR glasses waveguide brackets.
2. Multi material gas assisted composite molding
Toyota's "Gas Assisted Overmolding" technology utilizes:
Gas pressure gradient control
Multi material interface strengthening design
Real time temperature field monitoring
Realize the integrated molding of metal plastic fiber reinforced composite materials, applied to complex components such as car HUD brackets.
3. Sustainable Manufacturing Challenge
The industry is facing two major transformation pressures:
Adaptation of biobased materials: It is necessary to develop a gas assisted process parameter library suitable for biodegradable materials such as PLA and PHA
Closed loop gas system: Establish a circulation system with a nitrogen recovery rate>95%, reducing energy consumption by more than 30%
Digital twin application: Optimizing gas path planning through AI algorithms, reducing trial molding times by more than 50%