Article first appeared in Power Transmission Engineering blog on November 14, 2017.
Freudenberg Examines Sealing Requirements for Heavy-Duty Equipment
The seals and the hydraulic systems of any piece of mining, construction, agricultural or other heavy industry equipment operate under extreme conditions. Variable temperatures, aggressive hydraulic oils, dust and extended periods of operation place seals and their tribological systems under continuous duress. A new generation of material, 94 AU 30000, expands the boundaries for polyurethane use. This innovative compound can be used in standard cylinder applications where higher pressures, larger extrusion gaps, reduced internal friction, improved hydrolysis resistance and compatibility with bio fluids, among other factors, are important. DMRW2 hydraulic wipers made from 94 AU 30000 and sheet metal and the availability of this polyurethane as part of Freudenberg Sealing Technologies’ Xpress rapid replacement part service are applications discussed in the following article.
Today’s extreme environmental climates place extreme demands on the material and structure of the hydraulic seals used to maintain the performance and operation of heavy-duty equipment. The excavators, tractors, backhoes and tunnel boring machines that grind through the earth every day must work harder, longer, cleaner and more cost efficiently than ever to feed the plant, build its infrastructure and harvest its natural resources.
Sealing requirements for these machines must now include high values for tensile strength and elongation at break, resistance to oils and ozone, high elasticity and abrasion resistance. Polyurethane materials (PU) have traditionally met these industrial requirements. In comparison with elastomers, PU has a four times greater capacity for mechanical resistance, as well as outstanding resistance to ozone. At the same time, it stands up well to the stresses of mineral-based fluids.
Continue reading Sealing Heavy-Duty Equipment
Clamp seals guarantee fast and extremely secure tube connections in machines that are operated continuously. They are especially easy to install and re-separate. At drinktec 2017, Freudenberg Sealing Technologies presented its newly developed clamp seals, which not only reliably seal tube connections in production facilities – they also eliminate the costly conversion of connections to a “hygiene flange,” in accordance with DIN 11864. Unwanted over-compression into the interior space is prevented, guaranteeing secure, hygienic tube connections.
Continue reading Secure, Hygienic Connections
Freudenberg Sealing Technologies has introduced a new generation of polyurethane for seals that set new standards. Freudenberg’s development of its own materials is an important core competency. The company has succeeded in manufacturing a basic material for seals with a far longer operating life than the polyurethane materials used so far.
Watch the video below to see how the seals of today are fulfilling the requirements of tomorrow.
Continue reading VIDEO: The Polyurethane Generation
The Freudenberg Simmerring has been a successful product for about 85 years. It seals rotating shafts reliably, and is used in millions of applications and machines in many industries. The Simmerring is flexible, highly loadable, and very dependable. Freudenberg Sealing Technologies has now further developed Simmerrings for use in the process industry – and they are made of food-grade materials.
Maximum Performance even under Extreme Pressure: B2PT
Simmerrings with the B2PT design can be stressed with pressures of up to 10 bar. The B2PT consists of a newly developed material, Quantum® PTFE F18245, and a housing made of 1.4571 (V4a) stainless steel. The PTFE used here has been conceived especially for direct contact with foods. The still-required approvals under FDA 21 CFR §177.1550 und EC 10/2011 are in preparation. This Simmerring design is thus superbly suited for the food and pharmaceutical industries. The design of the B2PT can also be adapted for customer-specific, individualized applications.
Continue reading Proven Seal Design, New Materials
Small, nondescript and ostensibly unspectacular – it is often developments of this exact description that lead to groundbreaking innovations in the world of technology. The idea of manufacturing seal sleeves from leather scraps became the starting point in one of the most important developments in sealing technology: the Simmerring®. For 85 years, the Simmerring has been inseparable from the Freudenberg history of success, and, in Europe, its name has even become a synonym for (radial) shaft seal rings of every kind. Today the Simmerring is a high-tech product whose key functions go far beyond the sealing of the shaft against its housing.
It all started with the economic crisis of 1929, which plunged the leather industry and thus the Freudenberg tannery – which was founded in 1849 – into difficulties. To better distribute its risks in the future, Freudenberg began to diversify the company and serve a broader market. A sample of a leather sleeve from the United States was the inspiration for giving Walther Simmer and his team the job of developing a machine that could be used to produce lip seals made of leather scraps.
Continue reading 85 Years of the Simmerring®
Seals are increasingly being asked to do more than just seal. In the future, they should be able to forecast when they will break down and perform condition monitoring in real time – all on their own. As a technology specialist, Freudenberg Sealing Technologies is not just anticipating the steadily rising demands on seals but on future sealing materials as well. At Drinktec 2017 in Munich (Germany), the company presented a new generation of smart seals that is becoming possible for the food and process industries, thanks to a combination of various material characteristics.
Seals primarily consist of materials that cannot process signals in their pure form. That’s why Freudenberg Sealing Technologies’ material developers are investigating materials that seals can employ to become sensors or even actuators, for example, without impairing their original mission.
Continue reading Seals that Monitor Themselves
What do you do when you need an urgent spare part for a made-to-order seal? What do you do when special seals are required for a short production run of 400 machines? It’s hard to know. Here’s where the Freudenberg Xpress® experts come into play.
Timo Furrer oversees Freudenberg Xpress, which now includes 12 facilities worldwide. He and his team are in demand whenever time is pressing or the manufacture of prototypes or short production runs is required. “Customers traditionally turn to us when they need a specific sealing solution fast for maintenance and repair work,” Furrer said. But there are other occasions as well. Freudenberg Xpress experts are also called on when a manufacturer develops new equipment and has to find the best possible sealing systems for it. To avoid costly field tests, the manufacturer tests the limits of various prototypes that Freudenberg Xpress can provide on short notice.
From Tiny to Huge
To these sealing specialists, it doesn’t matter whether their customers need seals with diameters of just two millimeters or a full twenty meters – a size that can be found in wind turbines or hydro-electric plants. Nor does it matter whether the order is for a standard seal or a customer-specific product. “Within 24 hours of the incoming order’s arrival, we can produce and deliver up to 50 units,” Furrer said.
Continue reading When Things Have to Move Fast – Freudenberg Xpress