If you want to understand how an injection mold operates, you must first become familiar with the tool's features and functions. This is a quick guide for those who want to learn the fundamentals of injection molding tools. If you'd like even more information, you can read our comprehensive guide. An ABS Plastic Molds is one of the custom-machined tools used in plastic injection molding to shape molten plastic into plastic products. These molds are created by manufacturers for the specific plastic products that they will be manufacturing.

The two-plate injection mold is the most commonly used type of plastic injection molding company. Other types of injection molds are available as well. The two-plate tool is composed of two major components: the injection mold (A Plate) and the ejector mold (B Plate). These plates are attached to platens and held together with the help of a clamping unit. When these plates are joined together to form the {anchor}, a natural divide or split occurs, which is referred to as the parting line.

The Injection Mold (also known as the A Plate)
The {anchor} (also known as the A Plate) is the point at which molten plastic is transferred from the injection unit to the injection mold. The sprue bushing is the opening or entrance to the injection mold (A Plate). The sprue bushing is attached to the sprue, which is a passageway that directs molten plastic to the runners. Runners are tunnels or channels that connect the sprue to the gates or entrances of the cavity image. Runners guide the molten plastic into the cavity image.

 

 

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Image of the Cavity
The cavity image is an empty space within the injection mold that is used to form the shape of the desired plastic product. Injection molds can have a single cavity or multiple cavities. A single impression cavity mold is an injection mold tool that has only one cavity image. A mold that has two or more cavity images will be referred to as a multiple impression cavity mold. Some molds can have over one hundred and twenty-eight cavity images, which is quite a lot.

The Ejector Mold (B Plate) is a plastic ejector mold.
The ejector mold (also known as the B Plate) is the exit point through which the plastic product is ejected from the injection mold. When the plastic product is complete, the clamping unit slides the ejector mold (B Plate) away from the injection mold (A Plate), allowing the injection mold to be opened. As the mold opens, circular pins known as ejector pins push the plastic product out of the injection mold. Injection molds, by their very nature, leave marks on the plastic products that they produce.

The walls of the ejector mold (B Plate) are tapered to ensure that the plastic product ejects properly. The draft angle is the angle at which the draft is made. If there is no draft angle and the walls are 90 degrees, the plastic product will scrape against the walls of the ejector mold (B Plate) and will have difficulty ejecting. This may result in damage to the mold as well as to the molded plastic. With a draft angle, the molded plastic is easily ejected because the walls will not make contact with each other and air will rush in to break the vacuum seal.

What Comes Next
Now that you are familiar with all of the intricate components of an injection molding tool, the next step is to learn about the tooling process.