HVOF Supersonic Spraying Repair for Paper Dryer Cylinders

Paper manufacturers worldwide are plagued by dryer cylinder failure. Cast iron dryers suffer severe pitting, scratches and surface dents from high-temperature steam, corrosive pulp and doctor blade friction, leading to paper defects, high reject rates and frequent production shutdowns. Replacing brand-new cylinders costs a fortune with long sea transit time, resulting in massive production losses for mills across Europe, Southeast Asia, the Middle East and America.

Many overseas clients discovered our dryer spraying cases via global short-video platforms. Skeptical about on-site repair effects, they contacted us for trial cooperation. One client’s heavily worn dryer was scheduled for full replacement, which would bring huge budget pressure and long downtime. Our technical team customized Cr₂C₃-25NiCr cermet HVOF coating solutions based on their paper machine parameters, cylinder size and paper grades. We provide global on-site service without dismantling or long-distance transport of heavy dryers, cutting downtime and logistics costs greatly.

All processes comply with ISO & DNV thermal spraying standards. We fully degrease and blast the substrate before spraying to guarantee metallurgical bonding. Closed-loop control of fuel, oxygen and powder feed ensures uniform thin-layer coating with ultra-low porosity and outstanding adhesion. The finished coating delivers far better wear and corrosion resistance than original cast iron. After precision mirror polishing, the dryer restores a flawless working surface.

After repair, the cylinder releases paper smoothly without scratches or paper defects, suitable for printing paper, packaging paper and specialty glossy paper. Long-term mass production tests by overseas clients prove our coating extends service life by 4–6 times, while the total repair cost is only 1/3 of a new cylinder, cutting annual maintenance and shutdown losses significantly.

We offer professional English technical support, third-party NDT inspection reports and formal warranty contracts, serving paper industries worldwide. We provide one-stop renovation & surface strengthening service for all types of imported & domestic dryers. Send us your drawings and working conditions for customized quotations and technical proposals.