Plastic Injection Molding is a process used to produce components made from thermoplastics or thermosetting plastics. In this process, plastic (usually in the form of pellets) is heated and melted in the hopper of the injection molding machine. When the resin reaches a flowing state, under the pressure from the plunger or screw, the molten plastic is pushed forward and quickly injected through the nozzle into a closed mold at a lower temperature. After cooling and setting for a specified time, the mold is opened, and the finished product is obtained.

A) ​Single-Color Injection Molding Machine
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A single-color injection molding machine is designed to inject a single color of plastic into the mold during the manufacturing process. It is typically used for producing simpler parts that do not require multiple colors or materials. The process involves heating and injecting one type of plastic material, which solidifies in the mold to form the desired part.

B) Double Injection Molding Machine 
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A double injection molding machine, also known as two-shot injection molding, is capable of injecting two different types of plastic or colors into the same mold during the manufacturing process. This is often used to create parts with multiple materials or colors in a single cycle, reducing the need for assembly and increasing efficiency. The two different materials can be injected sequentially or simultaneously to form a complex, multi-material part.