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The History Of Underwater Pelletizers And Their Evolution Over Time

Underwater pelletizers are a vital part of the plastic industry, providing an efficient way to convert plastic resins into small, uniform pellets that can be used in a variety of applications. These machines have come a long way since their inception in the 1950s, with technological advancements improving their efficiency and reducing their environmental impact. In this article, we will explore the history of underwater pelletizers and their evolution over time.


Underwater pelletizers are used to convert molten plastic resins into small, uniform pellets that can be used in a variety of applications. This process is essential for the plastic industry, as it allows for the efficient production of plastic products. The first underwater pelletizer was invented in the 1950s, and since then, this technology has undergone significant improvements.

The Invention of Underwater Pelletizers

The first underwater pelletizer was invented by a German company called Automatik in the 1950s. This machine used a submerged cutting system that allowed for the production of small, uniform pellets. The process involved extruding molten plastic through a die plate and then cutting the extrudate into pellets using a rotating cutter that was submerged in water.

Early Advancements

In the early days of underwater pelletizers, the machines were relatively simple and had limited capabilities. However, as the plastic industry grew, so did the need for more efficient and versatile equipment. In the 1960s, underwater pelletizers began to incorporate additional features, such as underwater strand pelletizing and high-speed cutting systems. These advancements allowed for greater production rates and improved pellet quality.

The 1970s and 1980s

In the 1970s and 1980s, underwater pelletizers continued to evolve, with improvements in automation and control systems. These advancements allowed for greater precision and consistency in the pelletizing process, resulting in higher quality pellets. Additionally, advancements in material handling systems allowed for the efficient handling of larger volumes of pellets.

Modern Underwater Pelletizers

Today, underwater pelletizers are highly advanced machines that incorporate a range of features designed to improve their efficiency and reduce their environmental impact. Some of the key advancements in modern underwater pelletizers include:

1. Automation

Modern underwater pelletizers incorporate advanced automation systems that allow for greater control over the pelletizing process. This includes features such as automatic die plate cleaning and automatic knife adjustment.

2. Energy Efficiency

Modern underwater pelletizers are designed to be more energy-efficient, with features such as variable frequency drives that allow for greater control over motor speed.

3. Water Conservation

Water is a precious resource, and modern underwater pelletizers are designed to use it as efficiently as possible. This includes features such as closed-loop water systems that recycle water and reduce overall water consumption.

The Advantages of Underwater Pelletizers

Underwater pelletizing technology offers several advantages over traditional pelletizing methods. Some of the benefits of underwater pelletizers include:

  • Improved Product Quality

One of the most significant advantages of underwater pelletizers is the improved product quality they produce. The underwater pelletizing process ensures that the pellets produced are of uniform size and shape, which results in better product quality.

  • Increased Production Output

Underwater pelletizers also offer increased production output compared to traditional pelletizing methods. The continuous process of underwater pelletizing allows for faster production and increased output.

  • Reduced Manufacturing Costs

Underwater pelletizers are also cost-effective. They require less energy to operate and produce less waste, which reduces manufacturing costs.

  • Enhanced Safety

Unlike traditional pelletizing methods, which require workers to handle hot plastic, underwater pelletizers operate in a closed system, reducing the risk of accidents and injuries.

  • Improved Sustainability

Underwater pelletizers generate less waste than traditional methods, making them a more sustainable option for manufacturers who are looking to reduce their environmental impact.

  • Versatility

Underwater pelletizers can process a wide range of materials, including polymers, elastomers, and thermoplastics, making them a versatile choice for manufacturers who work with various materials.

  • Smaller Footprint

Underwater pelletizers take up less space than traditional pelletizing equipment, allowing manufacturers to save space and reduce their overall production footprint.

  • Customizable Pellet Sizes

Underwater pelletizing technology allows for the creation of custom pellet sizes, which can be tailored to meet the specific needs of a particular product or manufacturing process.

Underwater pelletizers have come a long way since their invention in the 1950s. Technological advancements have improved their efficiency and reduced their environmental impact, making them an essential part of the plastic industry. As the demand for plastic products continues to grow, it is likely that underwater pelletizers will continue to evolve and improve.

Famous manufacturers for underwater pelletizer in the world

  1. BKG

  As a top manufacturer of underwater pelletizer in the world, BKG has done a great job in the polymer plastic processing equipment.  Their underwater pelletizer ranges from 10kg to 100 tons/hr. Which is widely used for polymer processing, especially in the polytyne production which is always huge capacity. They are now belongs to Nordson which is also a giant in the plastic processing industry.

  1. Gala

Gala is another giant manufacturer for underwater pelletizer, they also convinced the customers all over the world due to its stable and excellent underwater pelletizer solution for different materials.  It was incorporated by MAAG laterally.

  1. MAAG

MAAG, as is well known to the customers by its unique design of underwater pelletizer, the stability, high quality, accuracy, etc demonstrated that they are worthy to buy for the polymer processing. Now they bought Gala, believe this will help MAAG to improve significantly and serve better for their customers all around the world.

  1. Econ

Econ is another famous manufacturer of underwater pelletizer from Austria.  Their underwater pelletizer is well designed. Especially for some special applications, they have intensive experiences and know-how.

About Underwater pelletizer from COWELL

At Cowell Extrusion, we take pride in being a leading supplier of polymer processing equipment. Our focus is on research and development (R&D), manufacturing and delivery of quality equipment for plastic extrusion. We have a strong and experienced team of professionals, comprising of designers, production experts, and sales personnel, who have worked in famous domestic and international companies for over 20 years.

Underwater Pelletizers

R&D and Manufacturing Capabilities

Our expertise in R&D and manufacturing enables us to deliver innovative solutions and products that cater to our clients’ requirements. Our products are of high quality and are designed to meet global standards. We strive to continually improve the performance of our equipment to help our customers stay ahead of the competition. Our team is dedicated to achieving excellence and ensuring that our clients receive the best possible service.

Collaboration with Universities and R&D Centers

At Cowell Extrusion, we work closely with well-known universities and R&D centers in China to optimize our product structure and quality. This collaboration allows us to leverage the latest research and development in the polymer industry to improve our products. We keep up with the latest trends in polymer development to ensure that our customers have access to the most advanced solutions.

Innovation and Application of New Plastic Machinery

We are committed to pushing the boundaries of plastic machinery innovation and applications. Our team is constantly exploring new ways to improve our products and services. We invest heavily in research and development to ensure that we are at the forefront of the industry. Our innovative solutions have enabled us to meet the diverse needs of our clients, who are spread across various industries.

Underwater Pelletizers Factory
Underwater Pelletizers Factory


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