In the field of plastic parts manufacturing, the double-plate injection mold is a major and simple injection mold structure that is widely used. This article will detail the concept of a two-plate injection mold, including its advantages and disadvantages, as well as the applications and design considerations for such a mold. In addition, we will also demonstrate the products of double-plate injection molds through some examples and provide some suggestions on how to choose a reliable injection mold service provider.
First, we need to understand what a double-plate injection mold is. Simply put, it is a mold consisting of two main parts: one is the movable mold and the other is the fixed mold. During the injection molding process, plastic material is injected between these two plates and then solidifies and forms the desired part shape through a heating and cooling process.
Next, let’s take a look at the advantages and disadvantages of double-plate injection molds. The advantages mainly include simple structure, easy operation and maintenance, and relatively low cost. However, it also has some disadvantages, such as relatively short mold life and not suitable for producing large or complex parts.
When designing a double-plate injection mold, factors to consider include mold size, shape, material selection, cooling system design, etc. These factors will affect the performance of the mold and the quality of the final product.
To help readers better understand double-plate injection molds, we will provide some actual product examples. These examples will show how a wide variety of plastic parts can be manufactured from a two-plate injection mold.
What is Two Plate Injection Mould?
Two plate injection mould is the primary and simplest injection mould structure. It has a very straightforward manufacturing process and generally has the fewest number of moving parts. Two plate injection mould splits into a movable half and fixed half when the mould opens. The movable half is attached to the moving platen on the injection machine, while the fixed half is attached to the stationary platen. The two halves are held together by clamping forces during the injection moulding process.
The main components of a two plate injection mould are:
- Cavity: The cavity is the hollow space in the fixed half of the mould that forms the shape of the plastic part.
- Core: The core is the solid part in the movable half of the mould that fits into the cavity and forms the inner shape of the plastic part.
- Sprue: The sprue is the channel that connects the nozzle of the injection machine to the runner system.
- Runner: The runner is the network of channels that distributes the molten plastic from the sprue to the gate.
- Gate: The gate is the opening that allows the molten plastic to enter the cavity from the runner.
- Ejector pins: The ejector pins are rods that push the plastic part out of the core when the mould opens.
Advantages and Disadvantages of Two Plate Injection Mould
Two plate injection mould has some advantages and disadvantages compared to other types of injection moulds, such as three plate mould or hot runner mould. Some of them are:
- Simple and low-cost design: Two plate injection mould has a simple structure with fewer components and moving parts, which makes it easier and cheaper to design, manufacture, and maintain.
- Less lead time: Two plate injection mould has a shorter production cycle than other types of injection moulds, which reduces the lead time and improves efficiency.
- Lower cycle time: Two plate injection mould has a faster cooling time than other types of injection moulds, which lowers the cycle time and increases productivity.
- The parting line must align with the gate: In a multi-cavity two plate injection mould, the runner and gate must be in the parting line to ensure runner and gate ejection when the mould opens. This may limit the flexibility in gate location and affect the appearance and quality of the plastic part.
- Molten plastic flow balancing is challenging: In a multi-cavity two plate injection mould, it is difficult to balance the molten plastic flow among different cavities, which may cause uneven filling, pressure loss, or defects in some plastic parts.
- Material wastage: Two plate injection mould uses a cold runner system, which means that every shot produces a solidified runner that needs to be trimmed and recycled. This increases material wastage and cost.
Applications of Two Plate Injection Mould
Two plate injection mould is suitable for producing simple or symmetrical plastic parts with low or medium complexity and volume. Some examples of applications are:
- Consumer products: Such as toys, household items, kitchenware, etc.
- Electrical products: Such as switches, sockets, connectors, etc.
- Medical products: Such as syringes, test tubes, etc.
Design Considerations for Two Plate Injection Mould
When designing a two plate injection mould, some factors need to be considered to ensure optimal performance and quality. Some of them are:
- Mould material: The choice of mould material depends on the plastic material, part geometry, production volume, and mould life. Common mould materials are steel and aluminum, which have different properties and costs.
- Cavity and core design: The cavity and core design should match the plastic part design and ensure proper filling, cooling, and ejection. The cavity and core should also have adequate strength, rigidity, and wear resistance to withstand the injection pressure and temperature.
- Runner and gate design: The runner and gate design should ensure a smooth and balanced molten plastic flow to the cavity, as well as minimize pressure loss, material wastage, and defects. The runner and gate size, shape, location, and type should be carefully selected based on the plastic material, part geometry, and mould structure.
- Ejector pin design: The ejector pin design should ensure a smooth and complete ejection of the plastic part from the core, as well as prevent damage or deformation to the plastic part. The ejector pin size, shape, location, and number should be carefully selected based on the plastic material, part geometry, and mould structure.
How to Choose a Reliable Injection Moulding Service Provider
Injection moulding is a complex and precise process that requires high-quality injection moulds and machines, as well as skilled operators and engineers. Therefore, choosing a reliable injection moulding service provider is crucial for ensuring the success of your plastic parts production project.
Here are some tips on how to choose a reliable injection moulding service provider:
- Check their portfolio: A good injection moulding service provider should have a portfolio of previous projects that showcase their capabilities and experience in different types of injection moulds and plastic parts. You can also ask for samples or references from their past or current customers to verify their quality and reputation.
- Compare their prices: A good injection moulding service provider should offer competitive prices that reflect their value and quality. You can compare their prices with other providers or industry standards to see if they are reasonable and transparent. You can also ask for a detailed quotation that breaks down the cost of each component and service.
- Evaluate their communication: A good injection moulding service provider should have clear and effective communication with you throughout the project. They should listen to your requirements and expectations, provide professional advice and feedback, update you on the progress and status of the project, and respond to your questions and concerns promptly and politely.
Two plate injection mould is a simple and cost-effective solution for producing plastic parts with low or medium complexity and volume. It has some advantages such as simple design, less lead time, and lower cycle time, as well as some disadvantages such as limited gate location, challenging flow balancing, and material wastage. Two plate injection mould is suitable for producing simple or symmetrical plastic parts such as consumer products, electrical products, or medical products. When designing a two plate injection mould, some factors such as mould material, cavity and core design, runner and gate design, and ejector pin design need to be considered. When choosing a reliable injection moulding service provider, some tips such as checking their portfolio, comparing their prices, and evaluating their communication need to be followed.
We hope this blog post has helped you understand the concept of two plate injection mould better. If you have any questions or comments about this topic or need any assistance with your injection moulding project, please feel free to contact us. We are a professional injection moulding service provider with over 10 years of experience in providing high-quality injection moulds and plastic parts for various industries. We have a team of skilled engineers and operators who can handle any type of injection moulding project with efficiency and accuracy. We also offer competitive prices, fast delivery times, and excellent customer service. Contact us today to get a free quote for your injection moulding project!