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Horizontal Pulpers

Type W:

The horizontal pulper design allows for a lower build height, as well as lower energy consumption. It can be customized with any of the Grubbens’ rotor units, offering the perfect fit to your process. 

Because the overall height is much lower than a vertical pulper, a shorter and less costly bale conveyor can be used. This results in a better, more compact and simpler layout for the entire system. The Grubbens horizontal design consumes less energy than a traditional vertical pulper under the same operating conditions. The unique design of the unit and tub yields optimum operation with minimal maintenance costs. 

A Grubbens pulper delivers a significantly reduced work volume and higher pulping consistency than an agitator. The design of Grubbens pulpers allows flexible and fully custom engineered installation solutions and its robust construction enables optimum customization, e.g. direct mounting of a cyclone onto a pulper. Low power consumption and high level of reliability results in a pulper with very low operating and maintenance costs.


Grubbens G-rotors are installed in pulpers that process broke with a dry content of less than 50 %. The design of the G-rotor enables optimum performance without strainer plate, resulting in minimal energy consumption. To further reduce energy consumption in trim processing, a frequency converter can be installed. Grubbens S-rotors are installed in pulpers that process broke with a dry content of 50 percent or higher. Cellwood designs and configures showers, venting systems and chutes in order to achieve optimum pulper operation.



Grubbens pulper units are designed for use with either a belt drive or a gear drive. A belt drive provides quieter operation and increased flexibility, while a gear drive is used when higher power demand is required. As the rotor unit has its own bearings, (when using a gear drive) the coupling is connected to the rotor shaft. This means that the gear only has to sustain torque forces. 


Process Engineering

Under machine pulpers require optimum level and pulping consistency. For more stable operation, the pulping consistency is controlled via flow metering. Venting systems are fitted so that a partial vacuum is created in the chute. This helps convey the web into the pulper resulting in quick submergence and minimizes the risk of condensation on paper machine parts.


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