What Is a Plastic Injection Mold?

A plastic injection mold is a metal tool used to shape plastic products according to the geometry of the mold cavity through the plastic injection molding process.

Each mold is designed specifically for a particular product based on factors such as shape, dimensions, number of cavities, and required product quality after molding.

Plastic injection molds are a key factor in determining product quality, production capacity, and manufacturing costs.

Types of Plastic Injection Molds

There are various types of plastic injection molds. The appropriate mold type is selected based on the product structure and technical requirements to ensure product quality, mold lifespan, and production efficiency.

1. Classification by Number of Mold Plates

• Two-plate mold

• Three-plate mold

2. Classification by Mold Opening Method

• Straight-opening mold

• Slide mold: combines straight and horizontal opening mechanisms to form products with complex structures.

3. Classification by Ejection Method

• Ejector pin mold

• Ejector plate mold

• Lifter mold

• Ejector sleeve mold

• Hydraulic or rotary motor mold for removing products with internal threads

• Air ejection mold

4. Classification by Mold Material

• Monolithic mold: The mold core and mold body are manufactured from the same material.

• Insert-core mold: The mold core is made from high-quality steel and installed into a mold body made from another material to optimize costs and improve efficiency.

5. Classification by Runner System

• Cold runner mold

• Hot runner mold

6. Classification by Gate Type

• Edge gate mold

• Submarine gate mold

• Pin gate mold

7. Classification by Steel Heat Treatment

• Mold using heat-treated steel

• Mold using non-heat-treated steel