Injection Molding Machine basics and configuration

June 14, 2024

Injection molding is a pivotal technology in the manufacturing world, renowned for its ability to produce complex and intricate plastic parts efficiently and in high volumes. As a leading Injection Molding Machine manufacturer, Hommar has mastered the art of designing and configuring machines that cater to the diverse needs of industries ranging from automotive to consumer goods. This article explores the fundamental aspects of injection molding machines and the sophisticated configuration options.


An injection molding machine is a complex piece of equipment designed to fabricate plastic parts by injecting molten plastic material into a mold where it cools and solidifies into the final product. The process involves several critical components: the injection unit, the clamping unit, the mold, and the control system. Each part plays a crucial role in ensuring the efficiency, accuracy, and quality of the manufacturing process.

The Injection Unit

The injection unit of an injection molding machine is where the plastic material is heated until molten and then injected into the mold. Hommar's injection units are designed to handle a wide range of thermoplastic materials, from common polymers like polyethylene and polypropylene to engineering plastics like polycarbonate and PEEK.

Key parameters of the injection unit include:

Injection Pressure: Hommar machines can achieve injection pressures up to 2,000 bar, ensuring that the molten plastic is forcefully and evenly injected into the mold cavities.

Shot Size: This refers to the maximum amount of plastic that can be injected in one cycle, measured in cubic centimeters or grams. We offers machines with a shot size ranging from 5 to 5,000 grams, accommodating small precision parts and larger components alike.

The Clamping Unit

The clamping unit is responsible for holding the mold closed during the injection and cooling phases. The strength of the clamping force is critical, as it must counter the injection pressures to prevent mold halves from separating and causing defects in the parts.

Clamping force is a vital numerical parameter, with our machines offering:

Clamping Force: Ranging from 5 to 6,000 tons, depending on the machine model, suitable for everything from small medical devices to large automotive parts.

The Mold

The mold is perhaps the most custom part of the injection molding process. It is designed based on the part to be produced and can be made from various materials, although hardened steel is common for high-volume production due to its longevity and durability.

Mold configuration considerations include:

Mold Material: Choices affect the heat transfer rate and wear resistance, critical for cycle time and mold life.

Mold Design: Must accommodate the material flow and cooling rate, which are essential for achieving the desired surface finish and dimensional accuracy.

The Control System

Modern injection molding machines from Hommar are equipped with advanced control systems that manage all aspects of the injection process, from temperature control to the precise timing of injection and cooling. These systems are essential for maintaining consistent quality and optimizing cycle times.

Features of control systems include:

Precision Control: Allows operators to adjust process parameters in real-time to maintain product quality.

Data Monitoring: Integrated sensors provide feedback on critical aspects such as material temperature and pressure, enabling automated adjustments and quality assurance.

Configuration Options

Hommar stands out in the industry by offering customizable injection molding machines tailored to specific production requirements. Clients can choose from a variety of machine configurations to best suit their needs:

Hydraulic, Electric, or Hybrid: Depending on the desired balance of power and energy efficiency, we provides hydraulic, electric, and hybrid machines. Electric models offer higher accuracy and speed, while hydraulic machines are praised for their robustness and ability to produce larger parts.

Multi-Material and Color Options: Hommar’s machines can be configured for multi-material injection or outfitted with units for mixing colors, providing the flexibility needed for producing parts with different materials or aesthetic finishes in a single cycle.

Automation Integration: To further enhance productivity and reduce labor costs, Hommar machines can be integrated with automation systems for parts handling and post-processing operations, streamlining the entire production line.


Understanding the basics and configuration options of injection molding machines is essential for manufacturers looking to optimize their production capabilities. Hommar's advanced technologies and customizable machine options provide manufacturers with the tools they need to produce high-quality plastic parts efficiently and competitively.

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