Injection molding is a versatile manufacturing process, and there are several different types or variations of injection molding, each designed to suit specific applications and requirements. Here are some of the common types of injection molding:

1. Conventional Injection Molding: This is the standard and most widely used type of injection molding. Molten plastic is injected into a mold cavity under high pressure to produce the desired part. It is suitable for a wide range of materials and applications.

2. Multi-Shot or Multi-Material Injection Molding: In this type, multiple materials or colors are injected into the same mold in a single shot. This process allows for the creation of parts with multiple colors or materials, eliminating the need for secondary assembly processes.

3. Gas-Assisted Injection Molding: In gas-assisted injection molding, a controlled amount of pressurized gas (usually nitrogen) is injected into the mold after the initial plastic injection. This gas forms hollow sections or channels inside the part, reducing material use and improving part strength.

4. Insert Molding: Insert molding involves placing pre-formed inserts or metal components into the mold cavity before injecting the molten plastic. The plastic material encapsulates the inserts, creating a strong bond between the plastic and the insert.

5. Overmolding: Overmolding is a process where two or more materials are used to mold a single part. It typically involves placing a pre-molded part (usually made of a different material) into the mold and then injecting a second material around it to create a composite part.

6. Micro-Injection Molding: Micro-injection molding is used to produce very small and precise plastic parts, often in the micrometer range. It is commonly used in the medical and electronics industries for miniaturized components.

7. Liquid Silicone Rubber (LSR) Molding: LSR molding involves injecting liquid silicone rubber into the mold cavity, which then cures to form flexible and durable parts. It is commonly used for products requiring a soft and flexible touch, such as seals, gaskets, and medical devices.

8. Thin-Wall Injection Molding: This type is used to produce thin-walled plastic parts, where the wall thickness is considerably smaller compared to the overall size of the part. It is used in packaging, containers, and other applications that require lightweight yet sturdy parts.

9. Reaction Injection Molding (RIM): RIM involves mixing two or more reactive liquid components that chemically react and expand within the mold to create the final part. It is often used for producing large, complex parts with a combination of rigidity and flexibility.

10. Co-Injection Molding: Co-injection molding, also known as sandwich molding or sandwich injection, involves injecting two different materials simultaneously, one on the outside and another on the inside of the mold. It is used for applications requiring specific material properties, such as barrier layers or enhanced aesthetics.

These different types of injection molding processes offer various benefits and are chosen based on factors like material properties, part complexity, required volume, and cost considerations for a particular application.