Injection mold types, structures and characteristics

In the injection molding process, due to various factors such as the shape structure of the injection molded product, production requirements, customer costs, etc. In order to meet different injection molding projects, different injection mold types have emerged. Here is an introduction to the types of injection molds and their respective characteristics:

Two plate injection mold

What is a two plate injection mold？

A double-plate injection mold is an injection mold composed of two mold parts. It is also called a single-parting surface mold. It is the simplest and most basic form of injection molds. Double-plate injection molds can be designed into single-cavity or multi-cavity injection molds as needed, so they are widely used.

Two plate injection mold structural components

Moving plate: A moving plate installed on the injection molding machine that controls the opening and closing of the mold along with the injection molding work.

Fixed template: It is installed on the fixed plate of the injection molding machine and remains stationary during injection molding.

When opening the mold, the movable mold and the fixed mold will be separated to facilitate the removal of injection molded parts.

Characteristics of two plate injection mold

1. Easy operation: The operation of the double-plate injection mold is relatively simple, and generally trained workers can operate it freely.

2. Strong durability: Double-plate injection molds have a long service life and rarely malfunction.

3. High precision: The accuracy deviation of double-plate injection molds is generally between 0.01 and 0.00lmm.

4. Low production cost: Compared with other mold types, the production cost of double-plate molds is the lowest.

Three plate injection mold

What is a three plate injection mold?

A three-plate injection mold is an injection mold composed of three mold parts. It is also called a double-parting surface injection mold. It is a variant of a double-plate injection mold.

It adds a partially movable intermediate plate (also called a movable gate plate), which is equipped with gates, runners and other parts and components required for fixed molds.

Three plate injection molds are often used for single-cavity or multi-cavity injection molds with point gate feeding.

Three plate injection mold structural components

Moving plate: A moving plate installed on the injection molding machine that controls the opening and closing of the mold along with the injection molding work.

Intermediate plate: Installed on the guide post of the fixed plate of the injection molding machine, it will open and close at a distance from the fixed template.

Fixed template: It is installed on the fixed plate of the injection molding machine and remains stationary during injection molding.

When the mold is opened, in addition to the separation of the movable mold and the fixed mold, the intermediate plate will also be separated from the fixed mold plate on the guide pillar of the fixed mold to facilitate the removal of the injection molded parts.

Characteristics of three plate injection mold

1. Strong adaptability: Three plate injection molds support the production and production of plastic parts with complex structures and high appearance and surface requirements.

2. Traceless molding: Compared with two-plate molds, three plate molds leave less gate traces on the product and can be molded without traces.

3. High precision: The precision deviation of double-plate injection molds is generally between 0.01 and 0.00lmm.

Hot runner injection mold

What is a hot runner injection mold?

Hot runner injection mold is an injection mold with a heating component system.

It can inject molten plastic into the mold cavity at a constant temperature. During each injection molding process, the plastic in the runner and sprue will not cool down and does not need to be taken out.

Hot runner injection mold structural components

Heating component: Continuously provides heat to maintain the temperature of the molten plastic when injected into the mold cavity.

Manifold: Responsible for distributing molten plastic to various mold cavities.

Nozzle: Responsible for injecting molten plastic into the mold.

Characteristics of hot runner injection mold

1. Constant temperature injection molding: It can ensure that the molten plastic remains at the same temperature when injected into the mold.

2. Speed ​​up production: No need to take out runners and sprues to improve production efficiency.

3. Save materials: There is no waste generated from runners and sprues, and no material is wasted.

4. Uniform quality: Molten plastic flows evenly into each mold cavity, resulting in consistent final quality.

Cold runner injection mold

What is cold runner injection mold?

Cold runner injection molds are injection molds that rapidly cool hot plastic through a cooling system to achieve efficient production.

After cooling in the mold, the plastic product is taken out. At the same time, the cold material of the sprue needs to be removed, and the product sprue plastic must be trimmed to finally obtain a plastic product with no obvious traces of the sprue.

Cold runner injection mold structural components

Cooling component: usually a water cooling system, which rapidly cools the plastic parts in the mold through the circulation of water.

Manifold: Responsible for distributing molten plastic to various mold cavities.

Nozzle: Responsible for injecting molten plastic into the mold.

Characteristics of cold runner injection molds

1. Efficient cooling: The cold runner mold uses low-temperature melt to inject the mold, which can quickly cool the molten plastic parts and solidify them.

2. High-quality products: Cold runner molds can reduce the internal stress of the product, avoid product deformation and cracking, and improve the quality and reliability of the product.

3. Easy to maintain: The cold runner mold has no easily damaged parts such as heating elements and hot nozzles, making it easier to maintain.

4. Low production cost: The structure of the cold runner mold is relatively simple, and the production cost is lower than that of the hot runner mold.

How to choose injection mold type

There are many factors to consider when choosing the right type of injection mold for plastic products.

Such as product geometry, injection molding materials, production output, delivery time, production experience, etc. The most important thing is to budget the production costs, which require professional injection molding engineers to give appropriate injection molding solutions.

At Universe Plastic Factory, you only need to provide product requirements and budget, and their one-on-one engineers will give you the appropriate injection mold type for you to choose, as well as explain the service content and project details in advance.

Injection mold type customization factory

Dongguan Universe Plastic Co., Ltd. has more than 15 years of injection mold experience and provides one-stop service for customized injection molds. If you have an injection molding project, please contact us. We have excellent product quality and special preferential prices.