What is an Injection Molding Machine? (Features, Applications for It)

June 07, 2024

Injection molding is a widely used manufacturing process for producing complex plastic parts with high precision and efficiency. At the heart of this process lies the injection molding machine, a sophisticated piece of equipment designed to shape molten plastic into desired forms. This article explores the features and applications of injection molding machines, providing insights into how they function and their significance in various industries. Brought to you by Hommar, a leading Injection Molding Machine manufacturer, this guide aims to enhance your understanding of this essential technology.

What are Injection Molding Machines?

An injection molding machine is a device used to manufacture plastic products by injecting molten plastic material into a mold. The machine consists of three main parts: the injection unit, the mold, and the clamping unit. These components work together to produce high-quality plastic parts with minimal waste.

PartⅠ - Key Features

Injection Unit

The injection unit is responsible for melting and injecting the plastic material into the mold. Key components include the hopper, barrel, and screw. The plastic material is fed from the hopper into the heated barrel, where it is melted. The screw then pushes the molten plastic into the mold cavity.

Numerical Parameters:

Injection Pressure: Up to 3000 bar

Injection Speed: 50 to 500 mm/s

Screw Diameter: 30 to 150 mm


The mold is a custom-designed cavity that shapes the molten plastic into the desired form. Molds can be single or multi-cavity, depending on the production requirements. They are typically made from durable materials like steel or aluminum to withstand high pressures and temperatures.

Numerical Parameters:

Cavity Count: 1 to 64 cavities

Mold Material: Hardened steel, aluminum

Cooling Time: 5 to 30 seconds

Clamping Unit

The clamping unit holds the mold in place and applies the necessary force to keep it closed during injection. It also facilitates the opening and closing of the mold to eject the finished part. The clamping force is crucial to ensure that the mold remains securely closed during the injection process.

Numerical Parameters:

Clamping Force: 50 to 5000 tons

Clamping Speed: 200 to 500 mm/s

Platen Size: 300x300 mm to 2000x2000 mm

PartⅡ - Types

Injection molding machines come in various types, each suited for specific applications. Some of the common types include:

Horizontal Injection Molding Machines

Horizontal injection molding machines are the most commonly used type. They have a horizontal configuration where the mold opens and closes horizontally. These machines are ideal for producing large volumes of parts and are widely used in various industries.

Vertical Injection Molding Machines

Vertical injection molding machines have a vertical configuration, with the mold opening and closing vertically. These machines are ideal for overmolding applications and insert molding, where components need to be precisely placed in the mold before injection.

Numerical Parameters:

Vertical Clamping Force: 30 to 500 tons

Injection Volume: 10 to 2000 cm³

Power Cord Injection Molding Machines

Power cord injection molding machines are specialized for producing power cords and connectors. These machines are designed to handle the specific requirements of molding electrical components, ensuring high precision and reliability.

Numerical Parameters:

Injection Pressure for Power Cords: 1000 to 2500 bar

Cycle Time: 15 to 40 seconds

PartⅢ - Applications

Injection molding machines are utilized across a wide range of industries, thanks to their versatility and efficiency. Here are some notable applications:

Automotive Injection Molding

In the automotive industry, injection molding machines are used to produce various components, including dashboards, bumpers, and interior parts. The precision and repeatability of injection molding ensure that automotive parts meet stringent quality standards.

Numerical Parameters:

Component Size: Small clips to large panels (up to 1.5 meters)

Material Used: ABS, polypropylene, nylon

Cycle Time: 20 to 120 seconds

Consumer Electronics

Injection molding machines play a critical role in manufacturing consumer electronics, such as smartphones, laptops, and home appliances. These machines enable the production of complex and precise parts, ensuring the functionality and aesthetic appeal of electronic devices.

Numerical Parameters:

Component Tolerance: ±0.05 mm

Production Volume: Up to millions of units per year

Medical Devices

The medical industry relies on injection molding machines to produce various devices, including syringes, inhalers, and surgical instruments. The ability to produce high-precision parts with biocompatible materials makes injection molding ideal for medical applications.

Numerical Parameters:

Material Used: Medical-grade plastics (e.g., polycarbonate, PEEK)

Sterilization Compatibility: Autoclave, ETO, gamma radiation


Injection molding is widely used in the packaging industry to create containers, caps, and closures. The high-speed production capabilities of injection molding machines make them suitable for producing large volumes of packaging materials.

Numerical Parameters:

Production Speed: Up to 30,000 parts per hour

Material Used: Polyethylene, polypropylene


Injection molding machines are indispensable tools in modern manufacturing, offering efficiency, precision, and versatility. From automotive injection molding to the production of consumer electronics and medical devices, these machines play a crucial role in various industries. Hommar, a leading Injection Molding Machine manufacturer, provides high-quality machines designed to meet the diverse needs of its clients. Whether you require a Vertical Injection Molding Machine or a Power Cord Injection Molding Machine, Hommar has the expertise and technology to deliver exceptional results. 

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