Gas Assist Injection

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Gas-Assist Injection Molding

Internal Gas Injection: Precision injection of high-pressure nitrogen into the center of the molten plastic stream to create hollow sections within thick-walled parts.
Partial Shot & Full Shot Processes: Mastery of both “Partial Shot” (controlled hollow space) and “Full Shot” (gas used for packing) techniques to suit different part geometries.
Gas Channel Design: Specialized engineering of internal gas channels to ensure the nitrogen follows the intended path without breaking through the part surface.
Advanced Gas Control Units: Integration of high-precision gas pressure controllers to manage the timing, pressure, and volume of nitrogen injection during the molding cycle.

Sink Marks & Surface Quality: Thick sections in traditional molding often lead to unsightly sink marks.
- Our Solution: Gas pressure acts from the inside out, pressing the plastic firmly against the mold walls to eliminate sink marks and ensure a smooth surface finish.
Structural Integrity & Warpage: Internal stresses in large parts can cause bending or twisting.
- Our Solution: The hollow structure created by gas assistance significantly reduces internal residual stress, ensuring superior dimensional stability and part flatness.
Weight Reduction & Material Cost: Customers seek to reduce part weight without sacrificing strength.
- Our Solution: By creating hollowed-out sections in rib-heavy or thick-walled designs, we can reduce material usage by 20%–40% while maintaining high structural rigidity.
Gas Fingering or Permeation: Gas entering areas where it shouldn’t (thin walls).
- Our Solution: Expert MoldFlow Analysis at the design stage to simulate gas penetration and optimize wall thickness transitions and gas needle placement.

Extensive Automotive Experience: Proven success in applying gas-assist technology to automotive door handles, grab bars, and large structural interior components.
Precision Tooling Capability: Our high-speed Makino CNC ensures that gas needles and sealing surfaces are machined to exacting tolerances, preventing gas leakage.
Integrated MoldFlow Simulation: We use advanced software to predict gas flow behavior, reducing the number of mold trials and ensuring a faster time-to-market.
One-Stop Service: GPT provides the complete setup, including the mold design, gas-assist equipment integration, and process parameter optimization for mass production.

Automotive Components: Hollow door handles, roof rack rails, mirror housings, and engine-room structural brackets.
Industrial & Furniture: Thick-walled handles for power tools, chair frames, and heavy-duty equipment housings.
Consumer Electronics: Large printer frames, TV stands, and appliance handles that require high rigidity and a premium finish.
Medical Devices: Ergonomic handles and structural support frames for medical carts and diagnostic equipment.