Why Rotary Blowers Are a Smart Choice for Paper Machine Vacuum Systems

The Real Vacuum Challenge in the Paper Industry

In papermaking, vacuum is not just a helper—it is a key part of the process. From forming to pressing, paper machines need stable and continuous vacuum to remove water from the paper web. Any fluctuation can affect paper quality, speed, and energy use.
This is where rotary blowers, also known as Roots vacuum pumps, come into play. They are widely used in long wire and suction box systems because they deliver strong airflow, steady performance, and reliable operation over long hours.

How Rotary Blowers Actually Work

Simple Design, Reliable Results

A rotary blower uses two lobed rotors rotating in opposite directions inside the pump casing. These rotors never touch each other. A small, controlled clearance is kept between the rotors and the pump body.
As the rotors turn, air is trapped and moved from the inlet to the outlet. This constant movement creates stable suction on the inlet side and smooth discharge on the outlet side.

Built for Continuous Operation

Because there is no internal contact or friction, wear is minimal. This makes rotary blowers ideal for 24/7 operation, which is exactly what paper machines require.

Why Rotary Blowers Beat Water Ring Vacuum Pumps

Higher Pumping Speed, Better Efficiency

Compared with water ring vacuum pumps, rotary blowers offer higher pumping speed under the same conditions. This means more air moved with less energy.
In coarse vacuum applications, this efficiency advantage can significantly reduce power consumption over time.

Compact Structure, Easy Maintenance

Rotary blowers have a simple and compact design. They take up less space and are easier to install.
Maintenance is straightforward—no complex water systems, no frequent part replacements. This helps lower downtime and operating costs.

Designed for Paper Machine Dewatering

Perfect Match for Suction Boxes

Rotary blowers are especially well-suited for suction boxes on long wire paper machines. They provide:

Stable vacuum levels

Continuous airflow

Fast response to load changes

These features help improve dewatering efficiency and support higher machine speeds.

Clear Limits, Reliable Performance

Rotary blowers handle dry air, wet air, or air mixed with small amounts of water very well. However, they are not designed for gases with heavy dust, solid particles, or corrosive substances.
Knowing these limits helps users get the best performance and longest service life.

Built to Last and Easy to Trust

With fewer wearing parts, solid rotor design, and sound attenuation at the outlet, rotary blowers deliver long service life and low noise.
For paper plants focused on efficiency, stability, and cost control, rotary blowers are a practical and proven solution.

Your Turn

If you are planning to upgrade or optimize your paper machine vacuum system, ask yourself:
Is your current vacuum equipment helping you save energy—or just consuming it?