Co-injection Molding

In co-injection molding, two different materials are injected. As a result, co-injection has certain unique benefits but also some possible shaping issues. By improving part quality and optimizing process control techniques, co-injection analysis assists you in overcoming potential issues and utilizing the benefits.

The sequential injection of skin and core plastic materials is simulated by co-injection analysis. Sequential co-injection uses an injection molding machine with one nozzle and two barrels.

(a) The mold is first filled with the skin plastic.

(b) Next comes the injection of the core plastic.

(c) In order to remove the core material from the sprue, the skin plastic is injected once more.

The substance that is anticipated to be applied to the cavity wall across the part's whole surface is called skin plastic. The skin plastic is pushed to fill the remainder of the space by the core plastic, which displaces it at the heated core. The final product resembles a sandwich, with the skin plastic covering the part's surfaces and the core plastic in the center.

A feature of injection molding known as fountain flow is exploited by co-injection molding. The plastic at the melt front travels from the stream's center line to the cavity walls as the cavity fills. The material that comes into contact with the walls cools quickly and freezes in place because the wall temperature is lower than the melt's transition temperature, also known as the freeze temperature. As a result, each wall has insulating layers that allow fresh melt to enter the melt front.

here to share with the mold testing video of co-injection molding:

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