What is Injection Machine? The guide to it

July 01, 2024

Injection molding machines, often referred to simply as injection machines, are essential tools in modern manufacturing. These machines are responsible for producing a vast array of plastic products that we use daily, from household items to automotive components. This guide by Hommar will walk you through the basics of injection machines, their functions, and their importance in the manufacturing industry.

Understanding Injection Machines

An injection machine is a complex piece of machinery designed to shape plastic materials into desired forms through a process called injection molding. The basic principle involves melting plastic, injecting it into a mold, and then cooling it to create a solidified part. Injection molding is widely recognized for its efficiency, precision, and ability to produce high volumes of identical parts.

Key Components of an Injection Machine

  1. Injection Unit
    This is where the plastic material (usually in the form of pellets) is melted and prepared for injection. The unit consists of a hopper, a screw, and a heating barrel.

  2. Clamping Unit
    This part holds the mold in place and applies pressure to keep it closed during the injection and cooling process. The clamping unit ensures that the mold remains tightly shut to form the part accurately.

  3. Mold
    The mold is the heart of the injection molding process. It is custom-designed for each product and determines the final shape of the plastic part. Molds are typically made of steel or aluminum and are designed to withstand high pressure and temperature.

  4. Control System
    Modern injection machines come equipped with advanced control systems that monitor and regulate the entire molding process. These systems ensure consistent quality and help in automating production.

The Injection Molding Process

The injection molding process involves several critical steps:

  1. Clamping
    The two halves of the mold are closed and securely clamped together.

  2. Injection
    Melted plastic is injected into the mold cavity through a nozzle. The injection pressure ensures that the plastic fills the entire mold.

  3. Cooling
    Once the mold is filled, the plastic begins to cool and solidify. Cooling time depends on the material used and the thickness of the part.

  4. Ejection
    After the part has cooled, the mold opens, and the finished part is ejected.

  5. Recycling
    Any excess plastic or scrap is collected and recycled for future use.

Types of Injection Machines

Injection machines come in various types, each suited for different applications:

  1. Hydraulic Injection Machines
    These are the most common type and are known for their power and reliability. They use hydraulic systems to control the injection and clamping processes.

  2. Electric Injection Machines
    These machines use electric motors instead of hydraulics, offering more precision and energy efficiency. They are ideal for producing small, intricate parts.

  3. Hybrid Injection Machines
    Combining the best of both hydraulic and electric systems, hybrid machines provide a balance of power, precision, and efficiency.

Applications of Injection Machines

Injection machines are used across numerous industries, including automotive, consumer goods, electronics, and medical devices. They are essential for producing items such as car bumpers, plastic bottles, mobile phone cases, and medical syringes. The versatility and efficiency of injection molding make it a preferred method for mass production.

Hommar's Expertise in Injection Machines

As a leading manufacturer in the industry, Hommar specializes in the design, production, and supply of high-quality injection machines. Our factory in China is equipped with state-of-the-art technology and staffed by skilled professionals dedicated to innovation and quality.

Why Choose Hommar?

  1. Advanced R&D
    Hommar invests heavily in research and development to stay at the forefront of technological advancements. Our R&D team continuously works on improving machine performance and developing new solutions to meet market demands.

  2. Cost Performance
    We offer machines that deliver exceptional performance at competitive prices. Our focus on cost performance ensures that our customers get the best value for their investment.

  3. OEM/ODM Services
    Hommar provides OEM (Original Equipment Manufacturer) and ODM (Original Design Manufacturer) services, allowing our clients to customize machines according to their specific needs. This flexibility helps businesses achieve their unique production goals.

  4. Comprehensive Support
    From initial consultation to after-sales service, Hommar offers comprehensive support to our customers. Our team of experts is always available to assist with installation, training, maintenance, and troubleshooting.

  5. Global Reach
    As a trusted supplier and distributor, Hommar has a global presence, serving clients across various continents. Our extensive network ensures timely delivery and support wherever our customers are located.


Injection machines are a cornerstone of modern manufacturing, enabling the production of a wide range of plastic products with precision and efficiency. Hommar's expertise in this field ensures that we provide top-quality machines that meet the diverse needs of our clients. Whether you are looking to enhance your current production capabilities or start a new manufacturing venture, Hommar has the right solution for you.

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