Oerlikon Barmag: High-speed pumps for complex PU applications
According to Oerlikon Barmag, polyurethane has become an integral part of our everyday lives, e.g. in the construction industry or in automobile building, in sports and leisure or in manufacturing furniture, for insulating or for sound-proofing. Its applications are as diverse as the respective manufacturing processes are complex. At this year’s PU China – taking place in Shanghai from 28 – 30 July 2021 – the company will be exhibiting (Stand 225) its precision metering pumps with tailor-made solutions even for the most demanding tasks in the chemicals industry, increased productivity and durability.
Oerlikon Barmag said its pumps reliably master demanding processes in polyurethane applications in the chemicals, plastics, paints and lacquers industries. One of the biggest challenges is metering poorly-lubricating media. With the GM and GA ranges and the corresponding components, the company supplies the suitable equipment for the relevant applications. The high-speed pump in particular fulfills the expectations of the chemical industry with its sealed product space, said the company. It has been especially developed for metering poorly-lubricating media.
“The high-speed pump is particularly advantageous in the chemical industry, which conveys aggressive acids”, said Thorsten Wagener, the salesman responsible for industrial and chemical application pumps at Oerlikon Barmag. The main advantage of the pump is the sealed product space. The space that comes into contact with the media is therefore limited to the area around the gears. The external, ball-bearing support points in the high-speed pump are externally lubricated, hence ensuring that the product to be metered does not cause damage as a result of poor lubrication. This extends the lifespan of the pump considerably.
Furthermore, the enlarged speed range (30 – 500 min-1) permits a large application range for which several pumps of varying sizes have had to be used to date. This cuts back on conversion times, while simultaneously reducing spare parts inventories. With its low weight of 1.4 kg, the compact pump (ø65mm) promises both considerable space savings and less wear on the machine. The pumps in the GM and GA series are said to provide precision metering with low-pulsation feeding of the conveying medium. The multi-stage GM pump conveys low-viscosity media (i.e., 250 bar, 100 mPas) even under high pressure and in the most challenging conditions. The square design from the proven GM series is the standard pump for many metering tasks. The development of the multi-stage pump expands the applications range for the GM series considerably. The round two-stage GM pump has been developed especially for use in high-pressure technology. It masters the particular challenge of conveying small throughputs with low viscosities. The pump is ideal for 0.05 through 20 cm³/rev feed sizes and is suited for use in high-pressure machines for polyurethane moulded parts, foam slabstock, refrigeration unit insulations and sandwich panels, for example.
Manufacturing companies are constantly facing the challenge of making their products and processes more efficient. Oerlikon Barmag has supplemented the tried-and-tested GM range with the GA series, developed especially for the challenging conveying of high-viscosity media. The GA series pumps are available for conveying volumes of between 1.25 and 30 cm³/rev (0.6 – 144 l/h). They have been designed for pressures of up to 200 bar, for viscosities of up to 1,500 Pas as well as for temperatures of up to max. 225 °C. With this range of pumps, Oerlikon Barmag offers its customers tailor-made solutions for many technical processes in which high-precision and even metering is of paramount importance.
With the drum pump, the company has created a pump designed specifically for conveying and metering high-viscosity materials such as adhesives, silicones and other high-viscosity materials from drums and other large containers and for pressures of up to 250 bar. Its special features not only include the fact that it removes high-viscosity materials from the drum, but that it also meters the medium directly without any additional interim stops. Gear pump and drum follower plate are aligned to each other so that the plate can effortlessly reach the bottom of the container, hence leaving a very low residue of <1 %. “This has a positive impact on both the material costs and the production process”, said Thorsten Wagener. The metering, which to date has been carried out in two steps requiring scoop-piston and metering pumps, can now be merged in into a single unit with the drum pump.