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PuK - Process Technology & Components 2022

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Pumps and Systems Report

Pumps and Systems Report Pump makes transporting high-viscosity 3D printing materials easy Light-curing liquid materials are used in many 3D printing processes in the medical technology industry, especially in dentistry. However, processing and delivering these complex high-viscosity composites presents a considerable challenge for pump technology. DMG Dental-Material GmbH, based in Hamburg, Germany, relies on the sine pump from Maso- Sine, a division of Watson-Marlow. This innovative, high-performance, positive displacement pump not only protects high-viscosity materials, while delivering them effectively, but is also easy to clean and maintain. Hamburg-based DMG Dental-Material Gesellschaft mbH is synonymous with high-quality dental material. Their products not only beautify the smiles of countless patients, but also make the daily work with dental materials easier for dentists and laboratories in more than 90 countries worldwide. One of the company's specialist areas is the research and development of innovative materials and products combining inventiveness and a love of quality. With their R&D and production “Made in Germany”, The company claims to be the market leader in the field of innovative materials. And rightly so, as its more than 50-year history shows: In 2009, for example, it launched the first product for drill-free treatment of incipient caries by caries infiltration. In order to ensure the easiest possible handling for a wide range of applications even before printing, the products are offered in plastic bottles of various sizes. Production and filling of the products take place in the state-of-the-art production building that was newly built only a few years ago. Some products in the light-curing 3D printing plastic family are offered in larger bottles containing 1000 grams, in addition to the smaller containers. Smaller quantities were previously filled with a dosing pump, but for the larger containers, but also to increase the filling capacity, the Hamburg-based company had to go new ways. Therefore, a new filling station was designed for the liquid 3D materials. The products have to be dispersed in a container during the filling process, otherwise the components, i.e. fillers and solvents, could separate. The materials with a viscosity of - depending on the product – up to 10,000 mPas are pumped to the filling valve via an approximately 5.5-metre-long ring line made of PTFE hoses. There, only a very small proportion of the mass is removed and filled into the bottles via a piston valve; the rest is pumped back into the dispersion tank. Highly viscous media and frequent product changes The ring line is fed via a positive displacement pump, which sucks in the highly viscous liquid during dispersion, i. e. it must have a sufficiently high suction capacity. The gentlest possible pumping is of particular importance: Strong pulsation peaks could theoretically lead to a lower precision of the filling valve and thus to more cumbersome filling or expensive overfilling. Due to the sensitive pumped media, strong shear forces during the pumping process should also be avoided. Since some of the pumped media are class IIa medical products, even the slightest abrasion, for example of hoses, must be excluded. Since several different products of the 3D material family are filled at the station, among others, the pump used must be suitable for more frequent product changes, i. e. enable maximum operating times with quick and easy main- Wide range of 3D dental printing materials The year 2017 marked another milestone for the company: They presented a new product family of liquid, light-curing plastics for dental 3D printing as well as matching 3D printers from a single source. This wide selection allows a variety of application areas in additive digital prosthetics to be covered, from individual impression trays to bite splints. Fig. 1: In addition to the smaller containers, some materials for 3D printing are offered in larger bottles containing 1000 grams, filling is performed via a ring line. 46 PROCESS TECHNOLOGY & COMPONENTS 2022

Problem solver for process engineering and sewage technology www.eggerpumps.com May 30 - June 3, 2022 Messe München Visit us! Hall B1 - Booth 345 Turo ® Vortex series T and TA Suitable for high solids concentrations and shear sensitive products in the chemical industry and for clogfree pumping of raw sewage with fibres and sludge. Fig. 2: The ring line is fed via a sinusoidal pump from MasoSine, part of WMFTG tenance or cleaning. “Since we first flush the pump with a cleaning solution and then additionally perform manual cleaning, the effort for disassembly and assembly should naturally be as low as possible,” says the production technician of the dental material company. In the end, DMG therefore opted for a sine pump from the supplier, to feed the ring line. The company already used several products from the supplier for smaller volumes, so it made sense to turn to him again. The Sales Engineer Biopharm at the pump manufacturer, recommended pumping trials with a sine pump. Sine pump – efficient functional principle for high viscosities In this innovative type of positive displacement pump, developed and produced in the Swabian town of Ilsfeld, rotation of a sinusoidal rotor creates four equally sized chambers which are displaced as a whole – their volume therefore does not change during the process. The medium to be pumped is gently conveyed in these chambers from the inlet to the outlet. Sealing from the discharge to the suction side is ensured by a gate seated on the rotor. This simple but powerful design makes sinusoi- dal pumps particularly suitable for use with high viscosities, easily managing up to eight million mPas. Thanks to extensive certification including EHEDG EL Class I Aseptic and 3A as well as fast and easy cleanability through using clean in place (CIP) and sterilisation in place (SIP) cleaning processes, the sine pump is the benchmark among positive displacement pumps in terms of hygiene. But the pump also offers considerable advantages over other pumps such as rotary lobe pumps when it comes to manual disassembly and cleaning. Due to the design principle with only one rotor, one shaft and one seal, the number of wetted parts is reduced to a minimum. Disassembly and cleaning are thus much easier and faster. In addition, the design offers considerable energy advantages over comparable positive displacement pumps and thus significantly lower energy consumption. Sine pumps are available in various sizes for flow rates of up to 255,000 l/h at a maximum pressure of up to 15 bar. Depending on the model, the pumps are selfdraining and self-priming. The pump can be used in aseptic processes, is bacteriaproof and requires no additional steam connections. Iris ® Diaphragm Control Valve Highly precise and energy saving control of flow rate through concentric Iris ® diaphragms. For aeration airflow control in WWTP’s and for gases or liquids in industry. SWISS ENGINEERED PUMPS SINCE 1947 Switzerland Emile Egger & Cie SA Route de Neuchâtel 36 2088 Cressier NE Phone +41 (0)32 758 71 11 Germany Emile Egger & Co. GmbH Wattstrasse 28 68199 Mannheim Phone +49 (0)621 84 213-0

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