The Evolution of Plastic Injection Molding Machine: Innovations and Best Practices

Plastic Injection Molding Machine

Introduction to Plastic Injection Molding Machines

Ever wondered how those intricate plastic parts in your gadgets or toys are made? Enter the world of plastic injection molding machine. These injection moulding machines have revolutionized the manufacturing industry, making it possible to produce high-quality plastic parts efficiently and consistently.

History of Plastic Injection Molding Machine

The journey of plastic injection blow moulding machine began in the late 19th century. The initial machines were quite basic but paved the way for the sophisticated machines we see today. Over the decades, technological advancements have refined the process, making it more efficient and versatile. A plastic injection molding machine is a method used to produce parts in large volumes. It’s one of the most common methods for manufacturing plastic products. The history of plastic injection molding is a tale of innovation, adaptation, and the rise of a global industry.

1. Early Beginnings:

The concept of injection moulding can be traced back to the 19th century. The first patent for a simple plunger injection method was granted to John Wesley Hyatt in 1868. He and his brother Isaiah created a machine to produce items like billiard balls by injecting celluloid into a mold.

2. The Birth of Modern Injection Molding Machine:

The 1930s and 1940s saw significant advancements. James Hendry built the first screw injection molding machine in 1946. This replaced the plunger method and allowed for more precise control over the speed and quality of injections. The introduction of the screw mechanism was a game-changer, as it mixed the material before injecting it, ensuring a consistent injection process.

3. The Post-War Boom:

After World War II, the demand for cheap, mass-produced consumer goods skyrocketed. The best injection molding machine was perfectly poised to meet this demand. The process was refined, and the industry expanded rapidly. The versatility of plastics and the efficiency of the molding process led to a surge in the production of a wide range of products, from toys to automotive parts.

4. Advancements in Materials:

As the industry grew, so did the need for a wider variety of plastics. Polystyrene, polyethylene, polypropylene, and more were developed and became popular materials for PET preform machine. These materials offered different characteristics, from flexibility to rigidity, allowing for a broader range of products to be manufactured.

5. Automation and Computerization:

The late 20th century saw the integration of automation and computerization into the injection molding process. Computer-Aided Design (CAD) and Computer-Aided Manufacturing (CAM) allowed for more intricate and complex mold designs. The introduction of Computer Numerical Control (CNC) machines further streamlined the molding process, enhancing precision and repeatability.

6. The Global Spread:

With the rise of globalization in the late 20th and early 21st centuries, electric injection molding machine became a truly global industry. Production facilities were established worldwide, catering to local and international markets. This global spread also led to innovations in design, materials, and techniques as different regions contributed their unique perspectives and challenges.

7. Sustainability and the Future:

In recent years, there’s been a growing awareness of the environmental impact of plastics. The industry has been working on sustainable solutions, such as bioplastics, recycling initiatives, and more efficient production methods. The future of electric injection molding machine will likely be shaped by the balance between the demand for plastic products and the need for sustainable practices.

The history of best injection molding machines is a testament to human ingenuity and adaptability. From its humble beginnings in the 19th century to its position as a cornerstone of modern manufacturing, it has continually evolved to meet the changing needs and challenges of society.

Precision Injection Molding Machine

How Does Plastic Injection Molding Machine Work?

Plastic injection molding is a manufacturing process used to produce plastic parts in large volumes. The basic principle is simple: melt plastic granules and inject them into a mold where they cool and solidify into the desired shape. Here’s a step-by-step breakdown of how a plastic injection molding machine works:

The Basic Process:

Imagine baking a cake. You mix the ingredients, pour them into a mold, and bake. Similarly, plastic injection molding involves melting plastic pellets, injecting them into a mold, and letting them cool and solidify. But, of course, it’s a tad more complex than baking!

Key Components of the Machine:

The heart of the machine is the injection unit, which melts and injects the plastic. Then there’s the clamping unit that holds and closes the molds. Together, they ensure a seamless molding process.


Types of Plastic Injection Molding Machines

Plastic injection molding machines come in various types and configurations, each suited for specific applications or production requirements. Here are some of the most common types:

1. Hydraulic Injection Molding Machine:

  • Traditionally the most common type.
  • Uses hydraulic systems to generate the necessary force for the injection process.
  • Hydraulic injection molding machine is known for their robustness and ability to produce large parts.

2. Electric Injection Molding Machine:

  • Uses electric motors to drive the machine’s movements instead of hydraulic systems.
  • Offers higher precision, energy efficiency, and reduced cycle times.
  • Electric injection molding machine have quieter operation compared to hydraulic machines.

3. Hybrid Injection Molding Machine:

  • Combines features of both hydraulic and electric machines.
  • Uses electric motors for some functions (like screw rotation) and hydraulic systems for others (like mold clamping).
  • Offers a balance between the robustness of hydraulic machines and the efficiency of electric machines.

4. Vertical Injection Molding Machine:

  • The mold clamping section and the injection section are vertically aligned.
  • Suitable for insert molding where components are placed in the mold manually before the injection process.
  • Vertical injection molding machine often used for over-molding applications.

5. Two-Shot (Multi-shot) Injection Molding Machine:

  • Capable of injecting two or more materials into a single mold cavity.
  • Used for producing parts that require multiple materials or colors without the need for assembly.
  • Can have two or more injection units.

6. Rotary Injection Molding Machine:

  • Features a rotating mold area, allowing one part to be injected and cooled simultaneously with another part being ejected.
  • Increases production efficiency.

7. Micro Injection Molding Machine:

  • Micro injection molding machine designed for producing very small parts.
  • Suitable for industries that require precise micro-sized components, such as medical or electronics.

8. Toggle vs. Ram Clamping:

  • Toggle Clamping: Uses mechanical toggles to lock the mold. Offers faster clamping speeds and is more energy-efficient.
  • Ram Clamping (Direct Hydraulic Clamping): Uses a hydraulic ram to push the mold halves together. Provides more uniform pressure distribution.

9. LSR (Liquid Silicone Rubber) Injection Molding Machine:

  • Specifically designed for molding liquid silicone rubber.
  • Often used in medical, baby products, and automotive applications due to the unique properties of silicone.

10. PET Preform Injection Molding Machine:

  • Designed specifically for producing PET (polyethylene terephthalate) preforms, which are later blown into bottles.
  • PET preform njection molding machine features a screw and barrel designed for the characteristics of PET.

11. PVC Injection Molding Machine:

  • Tailored for molding PVC (polyvinyl chloride) materials.
  • PVC injection molding machine is often equipped with a corrosion-resistant screw and barrel due to the chlorine content in PVC.

In conclusion, the type of plastic injection molding machine chosen often depends on the specific requirements of the production process, such as the type of plastic material, the design of the part, production speed, and precision. Advances in technology continue to introduce more specialized machines to cater to the diverse needs of industries.

Automatic Injection Moulding Machine

Benefits of Using Plastic Injection Molding Machines

Plastic injection molding machines have revolutionized the manufacturing industry, offering numerous advantages for producing plastic parts and products. Here are some of the primary benefits:

1. High Production Rate:

Injection molding machines can produce parts at a very high rate, making it suitable for mass production. Once the mold is designed and the machine is set up, parts can be produced with very short cycle times.

2. Consistency and Repeatability:

The machines produce parts with high consistency and precision. Once the initial settings are optimized, every subsequent part will have the same characteristics and dimensions.

3. Flexibility:

Various plastic materials are suitable for injection molding machines. Moreover, by switching out the mold or using diverse materials, one can effortlessly alter the color and design of the components.

4. Complex Part Design:

Injection molding allows for the production of complex and intricate parts that would be difficult or expensive to produce using other manufacturing methods.

6. Cost-Effective:

For large production runs, injection moulding machine can be more cost-effective than other manufacturing methods. The bulk of the cost is in the initial mold design and machine setup; after that, the cost per unit is relatively low.


Factors to Consider When Choosing a Machine

Selecting the right plastic injection molding machine is crucial for the success of your production process. Here are some key factors to consider:

1. Type of Material:

Ensure the machine you choose is compatible with the type of plastic you intend to use.

2. Clamping Force:

The clamping force determines how the machine can hold the mold under pressure. Choose a machine with a clamping force that matches the size and complexity of your parts.

3. Shot Size:

This refers to the maximum amount of plastic that the machine can inject in a single cycle. Ensure the machine’s shot size is suitable for the volume of the part you’re producing.

4. Tie Bar Spacing:

This is the distance between the horizontal tie-bars on the machine. It’s essential to ensure that the mold fits comfortably within this space.

5. Mold Thickness:

Different machines can accommodate molds of varying thicknesses. Ensure the machine you choose can handle the thickness of your mold.

6. Injection Pressure:

Some parts require higher injection pressures to fill the mold properly. Ensure the machine can provide the necessary pressure for your specific parts.

7. Machine Type:

Decide between hydraulic, electric, or hybrid machines based on your production needs, budget, and energy efficiency requirements.

8. Energy Efficiency:

Electric machines tend to be more energy-efficient than hydraulic ones. Consider the long-term energy costs when making a decision.

9. Reliability and Maintenance:

Opt for machines from reputable manufacturers known for reliability. Consider the ease of maintenance and availability of spare parts.

10. Automation and Control System:

Modern machines come with sophisticated control systems that offer precision and repeatability. Ensure the machine’s control system is user-friendly and offers the features you need.

The Future of Plastic Injection Molding Machines

With the rise of sustainable practices and AI, the future looks promising. Machines might become more energy-efficient, smarter, and even self-repairing! The plastic injection molding machine industry, like many other sectors, is undergoing rapid evolution due to technological advancements, environmental concerns, and changing market demands. Here’s a glimpse into the potential future of best injection molding machines:

1. Increased Automation and Integration:

The trend towards Industry 4.0 means that future machines will likely be more interconnected, with increased automation and integration into broader manufacturing systems. This will allow for real-time monitoring, predictive maintenance, and more efficient production processes.

2. Advanced Control Systems:

Enhanced machine learning and AI capabilities will lead to smarter control systems. These systems will optimize the molding process in real-time, adjusting parameters for maximum efficiency and quality.

3. Energy Efficiency:

As energy costs rise and environmental concerns become more pressing, future machines will be designed with even greater energy efficiency in mind. Electric machines, which are already more energy-efficient than hydraulic ones, may become more prevalent.

4. Enhanced Precision and Speed:

Technological advancements will lead to machines that can produce parts with even greater precision and at faster rates, catering to industries that demand high precision, such as aerospace and medical devices.

5. Sustainable and Bio-based Plastics:

With growing environmental concerns, there’s a push towards more sustainable plastic alternatives. Future machines will be designed to handle bio-based plastics and other eco-friendly materials efficiently.

The future of plastic injection molding machines will be shaped by technological innovations, environmental imperatives, and market demands. As the industry evolves, it will continue to offer solutions that are efficient, sustainable, and aligned with the needs of a rapidly changing world.


Manual vs Automatic Plastic Injection Molding Machine


Feature Manual Plastic Injection Molding Machine Automatic Plastic Injection Molding Machine
Operator Involvement Requires continuous operator control and supervision. Minimal operator intervention once set up.
Production Speed Slower production speeds due to manual operation. Faster production speeds due to automation.
Labor Requirements Higher labor requirements, as operators are needed to oversee the process. Lower labor requirements, reducing staffing costs.
Accuracy and Consistency Prone to variations in product quality due to human factors. Offers high accuracy and consistency in product quality.
Initial Setup Time Setup may be time-consuming and require skilled operators. Faster setup and configuration with less skilled labor.
Production Volume Suitable for small to medium production runs. Ideal for high-volume production runs.
Cost Efficiency Generally, lower upfront costs but higher operational labor costs. Higher upfront automation investment but lower long-term labor costs.
Quality Control Relies on operator vigilance for quality control. Provides automated quality checks and consistency.
Downtime and Maintenance More susceptible to downtime due to manual errors and maintenance needs. Reduced downtime with automated error detection and preventive maintenance.
Energy Efficiency May be less energy-efficient due to variations in operating technique. Typically more energy-efficient with optimized processes.
Adaptability to Changes May require significant adjustments for product changes. Can be reprogrammed for quick product changeovers.
Complexity of Operation Simpler operation but dependent on operator skills. More complex to set up but offers streamlined automated operation.
Overall Efficiency Lower overall efficiency compared to automatic machines. Higher overall efficiency with reduced production costs.

Keep in mind that the choice between manual and automatic plastic injection molding machines depends on specific production needs, budget constraints, and other factors, so it’s important to carefully evaluate which type of machine is best suited for a particular application.



Plastic injection molding machines have come a long way since their inception. They’ve transformed industries, making mass production of plastic parts efficient and consistent. As technology advances, we can only expect them to become even more indispensable. daoben is professional plastic injection molding machine manufacturer & supplier over the world.


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Frequently Asked Questions

Daoben has the SOP (Standard Operation Procedure) and all the production steps must follow up this SOP. Every machine needs at least automatic running over 72 hours and must be inspected carefully before shipment.

Actually, the delivery time of the machines is depended on the machine options. Normally, the delivery time of a standard machine could be within 1-2 months.

12 months warranty after shipment for mechanical parts, hydraulic parts, and electric components excluding the screw and barrel 6 months (not including use for recycled material or reclaimed material).

Yes, Daoben will provide one set of standard spare parts to the customer including a heater, filter, screw head, screw washer, checking ring, sealings, etc.

Surely, we have experienced technical engineers for oversea service, they would help you install machines and support training to workers also. Currently, we provide visits online by video call for COVID-19.

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