Gas-assisted injection molding is a novel plastic molding technology that introduces high-pressure gas into the thick-walled parts of the workpiece, creates a hollow section inside the injection molded part, completes the filling process, achieves gas holding pressure, and eliminates product shrinkage. The traditional injection molding process cannot combine the thick wall and the thin wall together, and the residual stress of the workpiece is large, it is easy to warp and deform, and there is a shrinkage on the surface. The newly developed gas-assisted technology successfully produced thick-walled and siding products by hollowing out the thick-walled interior, and the surface appearance of the product was excellent and the internal stress was low. Lightweight and strong. Has successfully developed gas-assisted product structure and mold design including gating system, air intake and airway distribution design technology, gas-assisted injection molding process design technology, gas-assisted injection molding process design technology, gas-assisted injection molding process computer simulation technology, gas-assisted injection molding products Defect diagnosis and elimination technology, gas-assisted process special material technology.
TV, home appliances, automobiles, furniture, daily necessities, office supplies, toys and other fields of plastic parts open up a new application field for plastic molding, especially for pipe-like products, thick walls, partial walls (different thickness sections) The components are composed of) and large flat structural parts.
Gas assist devices: including nitrogen generation and boosting systems, pressure control units and intake components. The investment is about 40-200 million yuan (depending on the scale and the grade required for the equipment). The gas-assisted process can be fully integrated with the traditional injection molding process (injection molding machine).
Reduce the weight of the product (saving material) can be 40% higher, shorten the molding cycle (saving time by 30%, eliminating sink marks, improving the yield; reducing the injection pressure by 60%, using small tonnage injection molding machine to produce large parts, reducing the cost of operation Longer die life, lower manufacturing cost, and more stable structure such as thick root, thick ribs, connecting plates, etc., increase the freedom of mold design. Usually 6-18 months can recover the increased equipment cost (specific economic benefits) Discuss with the parts).
2. Intake from the mold:
advantage-
Multiple inlets are available, and the gas passages do not need to be completely connected.
Gas and plastic can be injected simultaneously.
It is possible to use a hot runner to design the mold.
It can be used for the forming of asymmetric finished cavity.
Disadvantages -
The design mold must be redeveloped.
The gas needle will leave a trace of air.
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