A drum type screen for mechanical screening equipment to screen out or filter out non fiber material from pulp slurry.

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A trommel screen, also known as a rotary screen or drum screen, is a mechanical screening equipment used to separate materials based on particle size, shape, and density. It is widely employed in various industries, including the pulp and paper industry. In pulp and paper mills, trommel screens are used to remove contaminants and separate remove unwanted elements based on size and shape.

Working Principle

A trommel screen consists of a cylindrical drum with perforations or mesh screens on its surface. The drum is usually inclined and mounted on a frame, with the material to be screened fed into the higher end.

As the drum rotates, the material inside tumbles and slides, allowing the smaller particles to pass through the perforations or mesh while the larger particles and contaminants are retained and eventually discharged at the lower end.

Function and Advantages of Trommel Screen:

1. Efficiency: The rotating action of the drum helps to agitate and separate particles, ensuring thorough screening and separation.
2. Versatility: Trommel screens can be used for various materials and applications, making them a versatile screening solution.
3. Customization: The size of the perforations or mesh, drum dimensions, and inclination angle can be adjusted according to the specific requirements of the material being screened.
4. Low maintenance: Trommel screens have a relatively simple design with few moving parts, making them easy to maintain and operate.
5. Scalping and cleaning: Trommel screens can effectively remove contaminants and perform scalping (removal of oversized particles) and cleaning of the material simultaneously.

In the pulp and paper industry, trommel screens are used to separate fibers, remove contaminants such as plastic, metal, and other debris, and ensure a consistent fiber size and quality for further processing and paper production.