June 2019

In modern paper and cardboard production there are endless dosing tasks, for which precision and high reliability are especially critical. Mindful of these factors, European carton maker Moritz J Weig GmbH is increasingly turning to Qdos peristaltic pumps from Watson-Marlow Fluid Technology Group (WMFTG). PWE reports. Challenging dosing tasks solution F or modern and efficient paper production, dosing of various chemicals as paper additives or processing aids is unavoidable. On both of Moritz J Weig ‘s carton machines, many pumping tasks take place, for which the company relies on different pump types. However, for challenging dosing tasks that demand precision and reliability, Weig is increasingly shifting its focus to Qdos peristaltic pumps from WMFTG. Moritz J Weig is a respected supplier of folding boxboard and plasterboard made term accuracy. “The diaphragm pumps performed dosing tasks with a strongly pulsating flow,” reports Peter Molitor who, as Project Engineer, is responsible for material and water treatment on both carton machines in Weig. “We use a flow meter to control the dosage. However, due to high pulsation, recording the dosage was difficult and unreliable.” When the dosing is not exact, there can be a negative impact on product quality, sometimes even leading to reject stock. High maintenance Process, Controls & Plant Focus on: Pumps & Valves from recovered paper. At the company’s head office in Mayen, Germany, about 600 employees work on two carton machines with a total capacity of 630,000 tonnes per year. The first field test for a Qdos pump at Weig was in the wet section on ‘KM3’, a machine for folding boxboard. During sheet formation for the surface layer, a chemical antifoam agent is dosed into the running water. Until recently, solenoid diaphragm pumps were used, but were unable to guarantee the necessary long- 30 | Plant & Works Engineering www.pwemag.co.uk June 2019