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Key Takeaways
• The injection molding process has evolved for more than 150 years, beginning in 1872 with the first patented molding machine.
• New materials such as Bakelite, polystyrene, and nylon accelerated industrial expansion in the 20th century.
• The 1946 screw-type injection machine significantly improved melt control and product quality.
• Automation, CNC, and Injection Molding 4.0 enhanced accuracy, efficiency, and digital integration.
• Future trends emphasize sustainability, bioplastics, recycling, and real-time intelligent process control.

The injection molding process is one of the most influential manufacturing technologies in modern industry. Originating from basic mechanical concepts in the late 19th century, it has transformed into an advanced automated system integrating AI, IoT, and digital manufacturing tools. This article outlines the historical development of injection molding from its beginning to its current state.

Early Development
The process began in 1872 when John Wesley Hyatt and Isaiah Hyatt patented the world’s first injection molding machine. The machine used celluloid to produce billiard balls and marked the industrial foundation of plastic molding.

20th Century: Expansion of Materials and Applications
In 1907, Leo Baekeland invented Bakelite, the first heat-resistant plastic suitable for molding. New materials such as polystyrene (PS) and nylon were introduced between the 1920s and 1930s. Their properties enabled widespread use in electrical appliances, automotive components, and consumer goods.

Modern Machine Progress (1940–1970)
A major technological leap occurred in 1946 when James Watson Hendry developed the screw-type injection molding machine. This innovation improved melt quality and temperature control. During the same period, engineering plastics such as PC, PP, and PET were developed, enabling stronger and more precise molded parts.

Automation and Digital Era (1980–Present)
By the 1980s, automation and CNC systems significantly improved production accuracy. Between the 1990s and 2000s, advanced molding technologies emerged, including 2K molding, overmolding, and multi-material molding.
Today, Injection Molding 4.0 integrates AI, IoT, and 3D printing to support real-time adjustments, reduce waste, and enhance manufacturing efficiency.

Future Direction: Sustainability & Green Technology
Future developments focus on biobased materials, recycled plastics, and product designs that minimize unnecessary material usage. Intelligent molding systems capable of real-time parameter optimization will drive more sustainable and flexible manufacturing.

Summary
The injection molding process has continuously evolved since 1872, advancing in machinery, materials, and digital control. It remains a core manufacturing technology across industries and continues progressing toward smarter and more sustainable production.

Why Choose Hakkai Precision Thailand?
Hakkai Precision Thailand is a trusted expert in precision injection molding. We offer end-to-end service from mold design to high-performance part production backed by modern automation and strict quality control.
- Automated machines reduce waste and cost
- Engineering-grade materials for every industry
- Custom mold development tailored to your application

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❓ FAQ

Q: What is the benefit of the screw-type injection machine?
A: It provides better melt quality and temperature control compared with piston-type machines.

Q: What does Injection Molding 4.0 include?
A: The integration of AI, IoT, and 3D printing to optimize efficiency and reduce production waste.

Q: Which plastic materials were developed during the 20th century?
A: Polystyrene (PS), nylon, and Bakelite.

📚 Glossary (Key Terms)
Injection Molding: A process that melts plastic and injects it into a mold.
Bakelite: The first heat-resistant molded plastic.
2K / Overmolding: Processes that mold multiple materials into one part.
Engineering Plastics: Materials such as PC, PP, and PET used for strong, high-precision products.

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