Food & Drink Process & Packaging Issue 22 2019 | Page 7

adapted for the medium to be conveyed and was thoroughly tested to verify its suitability for the application. The lecithin molasses made gentle feeding into the mixing process absolutely necessary in order to guarantee uniform product quality. In addition, the high viscosity of the molasses and the associated shear stress had to be taken into account when the pump was selected and dimensioned. In view of all the components, LEWA recommended using a Pomac PLP2-2.5 with bi-wing rotors. Type PLP2-2.5 is designed so that it is possible to have a delivery rate of 36 l / 100 revolutions at a maximum speed of 1000 rpm, which satisfies the quality requirements particularly with respect to conveying the molasses in a way that does not harm the product. “The prevailing pressure of 2-5 bar during this process was not particularly challenging for the PLP 2-2.5, because the pump is designed for a pressure of up to 15 bar,” Woldering adds. “From our side, the pump was also equipped with a gear motor with an integrated frequency inverter and then delivered to Hansa Industrie-Mixer for further processing.” Customer-specific control device and scale The special requirements of Terheggen & Dethlefsen also necessitated additional features. “A mobile metering system was required that automatically admixes certain quantities of the medium being conveyed in accordance with the control signals of a scale,” Woldering explains. LEWA delivered the pump, including the frame and cart, and brought Hansa to enable the selection of manual or Industrie-Mixer GmbH & Co. KG on automatic mode. board. Hansa Industrie-Mixer has many years of experience in the food industry and was responsible for designing the control system, manufacturing a suitable stainless-steel control cabinet and implementing suitable components such as hoses and check valves. The separate control system was necessary to ensure A high-precision scale adapted specifically for this application was used for metering; it was connected to the control system and then to the pump. Based on the extremely positive assessment of the project so far, both LEWA and Hansa see new cooperation as accurate metering in accordance with entirely possible in the future. the recipe and to make sure the mixing For more information, visit: process runs smoothly in automatic mode. A switch was also integrated www.lewa.com and www.hansamixer.de FDPP - www.fdpp.co.uk 7