KNF Neuberger has developed new pumps for drop-on-demand (DoD) and continuous inkjet (CIJ) printing systems, which have been designed to facilitate continuous ink transfer.
The company develops, produces and distributes high-quality diaphragm pumps and systems for gases, vapours and liquids. At this month’s InPrint Munich 2019, taking place 12-14 November at Messe München in Munich, Germany, KNF will showcases its latest options for DoD and CIJ printing systems, including its FK 1100 and FK 1.1100 diaphragm liquid pumps. Their design enables direct, leak-proof integration into customers’ systems. Low viscosity inks can be moved through the printing system to the print head at pressures of up to six bar with no losses.
Three diaphragms work together inside the pump head. They are set at 120-degree angles to one another and connected in parallel, leading to very low pulsing. The gentle transition minimises shearing forces, and this careful transfer protects sensitive pigments.
The modular system developed in-house at KNF offers brushless DC motors and AC motors. The rotational speed of the brushless DC motors can be controlled via analogue or digital signals to enable low flow rates as needed. Both models offer flow rates of up to 12.4l/min with a suction head of up to 4.5mWs.
Also presented is the FP 400 diaphragm liquid pump, with a flow rate of up to 4.4l/min that makes it particularly well suited to ink circulation. KNF has managed to horizontally arrange five diaphragms on a single level for the first time, ensuring very low pulsing on both the pressure and suction sides. This was previously only possible with gear pump technology due to design constraints, according to KNF. Further the typical secondary measures for avoiding pulsing are no longer needed. The functional advantages tied to diaphragm pump technology also come into play, with FP 400 self-priming and maintenance-free, and can operate dry. This model’s minimal shearing forces also work to preserve inks. The FP 400 offers IP65 protection.
Read more about InPrint Munich 2019 in the November/December issue of Digital Labels & Packaging
