Tag Archive for: Collapsible core injection molding

collapsible core injection molding

Collapsible core injection molding is a specialized manufacturing process that involves the use of a core that can be easily collapsed or removed from the molded part or product. This process is often used to produce complex shapes or hollow parts that would be difficult to create using traditional injection molding techniques. In this article, we will explore the basics of collapsible core injection molding, including its benefits, the process involved, and some of the key considerations to keep in mind when using this method of production.

Benefits of Collapsible Core Injection Molding

There are a number of reasons why collapsible core injection molding is a popular choice for manufacturers. One of the key benefits of this process is its ability to produce complex shapes and hollow parts. Traditional injection molding techniques often require the use of multiple molds or the inclusion of cores or inserts to create these types of parts, which can be time-consuming and expensive. By using a collapsible core, manufacturers can simplify the molding process and reduce the number of steps involved.

Collapsible core injection molding is also more efficient than traditional injection molding techniques. Because the core can be easily collapsed or removed, there is less risk of defects or imperfections in the finished product. This can reduce production times and lower costs.collapsible core injection molding

The Process of Collapsible Core Injection Molding

The process of collapsible core injection molding involves several steps, including the preparation of the mold, the injection of the resin, and the removal or collapsing of the core.

First, the mold is prepared. This typically involves creating a cavity in the mold that is shaped like the desired part or product. The mold may also include a core or insert that will be used to create hollow areas or complex shapes.

Next, the resin is injected into the mold using a traditional injection molding machine. The resin is injected under high pressure, and it is allowed to cool and solidify within the mold.

Once the resin has solidified, the core is collapsed or removed. This is typically done using a hydraulic or mechanical system that pushes the core out of the molded part or product. The part or product is then ejected from the mold, and the process is complete.

Key Considerations for Collapsible Core Injection Molding

Collapsible core injection molding is a specialized process that allows the production of complex plastic parts with internal features. There are a number of key considerations to keep in mind when using collapsible core injection molding.

  1. Design Complexity:
    • Consideration: Collapsible core molding is particularly beneficial for parts with intricate internal features, such as holes, undercuts, or hollow sections.
    • Importance: The design complexity should align with the capabilities of the collapsible core mechanism. Evaluate the part’s geometry to ensure it is suitable for this molding process.
  2. Material Selection:
    • Consideration: The choice of plastic material affects the molding process and the collapsible core’s performance.
    • Importance: Select materials that are suitable for injection molding and provide the desired properties for the end product. Consider material shrinkage rates and flow characteristics.
  3. Collapsible Core Mechanism Design:
    • Consideration: The design of the collapsible core mechanism is critical for successful molding.
    • Importance: Collaborate with experienced mold designers to ensure that the collapsible core can retract effectively, creating the desired internal features without causing defects.
  4. Mold Design and Fabrication:
    • Consideration: The mold must be designed to accommodate the collapsible core mechanism.
    • Importance: Work closely with mold designers to ensure that the mold design allows for reliable and repeatable operation of the collapsible core. Precise machining and fabrication are crucial for the success of the process.
  5. Injection Molding Process:
    • Consideration: Make sure the injection molding operator understanding the collapsible core mechanism clearly, such as temperature, pressure, and cooling channel, mold opening sequence, can impact the success of the process.
    • Importance: fully understanding the collapsible core mechanism and allow the collapsible core closing and opening without causing defects in the final part.
  6. Operator Training:
    • Consideration: Operators should be trained to understand the nuances of collapsible core molding.
    • Importance: Provide thorough training to operators to ensure they are familiar with the unique aspects of the process, including the operation and maintenance of the collapsible core.

Collapsible core injection molding is a sophisticated process that requires careful consideration of these factors to achieve successful and consistent results. Collaboration with experienced mold designers and mold manufacturers is crucial for navigating the intricacies of this molding technique.

Collapsible core mold design

Collapsible core mold design is a crucial aspect of implementing collapsible core injection molding effectively. The design of the mold determines the functionality, efficiency, and quality of the molded parts. Here are some key considerations for designing a collapsible core mold:

  1. Understand Part Requirements: Begin by thoroughly understanding the part requirements, including the desired internal features, undercuts, and hollow areas. This understanding will guide the design of the collapsible core mold.
  2. Determine Core Configuration: Decide on the appropriate collapsible core configuration based on the part design and complexity. Common configurations include telescoping cores, sliding cores, and rotating cores. Select the configuration that best suits the specific requirements of the part.
  3. Material Selection: Choose suitable materials for the collapsible cores. The material should possess sufficient strength, durability, and heat resistance to withstand the molding process without deformation or wear. Consider materials such as high-strength alloys or hardened tool steels.
  4. Core Actuation Mechanism: Determine the actuation mechanism to retract or collapse the collapsible cores after molding. This mechanism can be hydraulic, mechanical, pneumatic, or a combination of these. Ensure that the mechanism provides reliable and precise control for smooth retraction.
  5. Cooling System: Incorporate an effective cooling system within the mold design to ensure proper cooling of the molded part. Cooling channels or inserts should be strategically placed to optimize cooling efficiency and minimize cycle times.
  6. Venting: Proper venting is crucial to ensure the escape of air and gases during injection molding. Incorporate venting features or venting inserts in the mold design to prevent air traps and ensure complete part filling.
  7. Draft Angles: Incorporate appropriate draft angles into the mold design to facilitate easy ejection of the part. Draft angles allow for smooth part release from the mold, reducing the risk of part damage or sticking.
  8. Ejection System: Design an efficient ejection system to facilitate the smooth ejection of the molded part from the mold. Ejection pins, ejector plates, or other mechanisms should be positioned to avoid interference with the collapsible cores.
  9. Mold Construction: Ensure the mold construction is robust and precise to withstand the pressures and forces exerted during the injection molding process. The mold should be accurately machined and assembled to ensure dimensional accuracy and repeatability.
  10. Tooling and Manufacturing Considerations: Collaborate with tooling manufacturers to ensure the feasibility of the mold design and its manufacturability. Consider factors such as mold complexity, cost, lead time, and maintenance requirements during the design phase.

By carefully considering these factors and working closely with mold design experts, manufacturers can develop efficient and reliable collapsible core molds. The well-designed mold will facilitate the successful implementation of collapsible core injection molding, resulting in high-quality molded parts with intricate internal features and reduced manufacturing costs.collapsible core mold

How much does a collapsible core mold cost

The cost of a collapsible core mold can vary significantly depending on various factors. These factors include the complexity of the part design, the number of cavities in the mold, the material used for the mold, the level of precision required, and the overall size and intricacy of the mold. Additionally, factors such as the location of the mold manufacturer and prevailing market conditions can influence the cost.

As a rough estimate, the cost of a collapsible core mold can range from several thousand dollars to tens or even hundreds of thousands of dollars. Simple molds with fewer cavities and less complexity generally cost less, while molds with intricate designs, multiple cavities, and specialized features will typically be more expensive.

It’s important to note that the cost of the mold is just one aspect of the overall investment in collapsible core injection molding. Other factors to consider include the cost of the injection molding machine, auxiliary equipment, materials, labor, maintenance, and ongoing operational expenses.

To obtain an accurate cost estimate for a specific collapsible core mold, it is advisable to consult with mold manufacturers or specialized mold design and manufacturing companies. They can assess your specific requirements, provide detailed quotations, and help optimize the design and manufacturing process to meet your budgetary constraints while ensuring the desired quality and functionality of the mold.

At Sincere Tech, we are dedicated to maintaining our position as a leading plastic mold company by embracing industry advancements and anticipating future trends. We actively explore innovative materials and composites that offer improved performance and sustainability. Through ongoing investments in research and development, we deliver cutting-edge solutions that address the evolving needs of our customers. As one of the best injection mold suppliers in China, we pride ourselves on our commitment to excellence.

In line with our commitment to sustainability, we prioritize environmentally friendly practices. We proactively seek sustainable alternatives, such as biodegradable polymers, and implement recycling initiatives to minimize the environmental impact of our manufacturing processes. By choosing our collapsible core mold services, you can align your brand with sustainable manufacturing practices and contribute to a greener future.

Quality is of the utmost importance to us, and we maintain stringent quality control measures throughout the entire manufacturing process. Our state-of-the-art facilities and skilled technicians ensure that each product undergoes rigorous inspection and testing, guaranteeing exceptional performance, reliability, and customer satisfaction.

When you partner with Sincere Tech as your preferred China mold maker, you can expect the highest level of professionalism, expertise, and innovation. We are dedicated to helping you bring your ideas to life, delivering superior products that excel in performance, durability, and cost-effectiveness.

Our expanded capabilities include:

  1. Rapid Prototyping: We offer rapid prototyping services to quickly transform your concepts into tangible prototypes, allowing for iterative design improvements and accelerated product development.
  2. Precision Tooling: Our advanced tooling capabilities enable us to create high-quality molds with tight tolerances, ensuring consistency and precision in your injection-molded products.
  3. Overmolding: We specialize in overmolding, which allows for the combination of multiple materials or components, resulting in enhanced functionality, aesthetics, and durability.
  4. Insert Molding: Our expertise in insert molding enables us to securely encapsulate inserts within the molded parts, facilitating efficient assembly and enhancing product performance.
  5. Two-Shot Molding: With two-shot molding, we can produce complex, multi-material components in a single operation, reducing assembly requirements and enhancing design possibilities.
  6. Value-Added Services: In addition to injection molding, we offer a range of value-added services, including product assembly, packaging, and logistics support, streamlining your supply chain and reducing costs.

Partner with Sincere Tech Mould suppliers for your collapsible core mold needs, and benefit from our comprehensive capabilities, unwavering commitment to quality and sustainability, and our drive to exceed your expectations at every step of the process. Together, let’s bring your innovative ideas to life.


Collapsible core injection molding is a specialized manufacturing process that offers a number of benefits over traditional injection molding techniques. By understanding the process and key considerations involved, manufacturers can effectively use collapsible core injection molding to produce complex shapes and hollow parts efficiently and cost-effectively.