What’s plastic injection molding?

Plastic injection molding technology uses an extruder to inject molten plastic material into a metal mold. The molten plastic is poured into this confined space and allowed to cool and solidify to obtain a plastic finished product with the same shape as the closed space. Called, injection Molding. It is the most important and widely used technology in plastic molding.


The principle of injection molding is to pour plastic raw materials into the barrel of the extruder, and the raw materials are stirred by the rotating screw device, and heated and melted in the heating barrel of the extruder. Under the alternate operation of spiral rotation and oil pressure advancement, the liquid plastic is ejected from the cylinder at high pressure to fill the space in the metal mold, and then the cold water is immediately sent into the metal mold to reduce the temperature. After the molded product has cooled and hardened, it can be removed from the mold. These processes can be fully automated and continuously produced at high speeds. The speed is very fast. On average, a cup can be completed in about 10 seconds, and a ball-point pen tube can be completed in 1 second. Even large items such as automobile dashboards can be completed in 3-4 minutes. Of all the forming methods, it is the fastest and suitable for mass production. In addition, the size of the molded product is accurate and the quality is stable.

From simple-shaped cups to complex-shaped automobile dashboards, from 0.01g of pinions for watches and clocks, to large-sized molded products of bathtubs larger than 20Kg. Less raw material loss, convenient completion and processing, and color when molding, beautiful appearance. In addition, costs can be greatly reduced during mass production.

  • Plastic injection molding process:

  • 1. Provide samples or design drawings (2D / 3D)
  • 2. Confirm product material, weight, color, and specifications
  • 3. CHANG YANG provides quotation according to demand
  • 4. Material preparation & entering production schedule
  • 5. Mold development
  • 6. Mould test
  • 7. Quality Control Inspection
  • 8. Mold repair & trial molding mold completed
  • 9. Mass production
  • 10. Secondary processing (Pad printing, bronzing, plating)
  • 11. Assembly
  • 12. Ship
  • Material

  • ABS
  • PP
  • POM (Polyoxymethylene)
  • nylon
  • TPR
  • AS
  • CA (Cellulose acetate)
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