Custom Hydraulic Cylinders for Metallurgical & Heavy Machinery

For the paper and pulp industry, Tianjin Uranus Hydraulic Machinery Co., Ltd. designs custom hydraulic cylinders that operate reliably in wet, corrosive, and high-contamination environments. Applications include paper machine press sections, calenders, winders, pulpers, and digesters. As a national high-tech enterprise with over 30 years of experience, we understand the need for cylinders that resist corrosion from water, chemicals, and paper stock, while providing precise control for web tension and nip pressure. Our custom cylinders for paper machine press rolls are typically large, with bores up to 500 mm and strokes up to 2,000 mm. They must apply precise, uniform pressure across the roll to remove water from the paper web. We use stainless steel or chrome-plated rods, and the cylinder barrel is coated with a corrosion-resistant epoxy. The seal system is designed to withstand the aggressive chemicals used in papermaking, such as alum, bleach, and dyes. For a Finnish paper machine builder, we supplied custom loading cylinders for a shoe press. These cylinders operate at pressures up to 250 bar and are equipped with load cells for closed-loop nip pressure control. The cylinders have been in service for over eight years with minimal seal replacement. For calender stacks, our custom cylinders are used for roll lifting and nip loading. These applications require precise position control to maintain sheet thickness. We offer cylinders with integrated magnetostrictive position sensors and proportional valves. For a US-based paper mill, we provided custom cylinders for a supercalender. The cylinders have a bore of 125 mm and a stroke of 600 mm, and they achieve positioning accuracy of ±0.1 mm. For pulpers and digesters, we supply cylinders for valve actuation and batch discharge. These cylinders must withstand high temperatures and corrosive black liquor. We use duplex stainless steel for wetted parts and high-temperature Viton seals. For a Brazilian pulp mill, we supplied custom cylinders for a continuous digester's bottom scraper, operating at 170°C and 10 bar pressure. The cylinders have been running for over six years without failure. Our manufacturing process for paper industry cylinders includes 100 percent dye penetrant testing of welds, hydrostatic testing, and functional testing with the specified hydraulic fluid. We provide a comprehensive documentation package including material certificates, test reports, and a recommended spares list. Our after-sales support includes remote troubleshooting and spare parts availability through our global network. For a custom cylinder for your paper or pulp application and a quote, please contact our engineering team.