Dryers, press rolls, guide rolls and rewinding mechanisms are core equipment of papermaking production lines. Support positions at both ends of rollers operate under harsh working conditions: continuous bidirectional combined loads, high-temperature radiation from dryer surfaces, humid vapor filling workshops, erosion by spray mist, floating fine paper dust and fiber flocs, and uninterrupted all-weather continuous production. Papermaking lines demand extremely high continuity. Once bearing overheating, abnormal noise or jamming causes shutdown, equipment cooling, paper dust cleaning and paper rethreading take a long time, easily triggering large-scale paper breaks and waste of finished paper, leading to heavy economic losses. Ordinary tapered roller bearings cannot adapt to high-temperature, high-humidity and dust-filled environments in papermaking workshops, becoming a common pain point for paper machinery manufacturers and mill maintenance teams. During operation, dryers and press rolls continuously bear heavy radial loads and axial thrust with frequent load fluctuation. Ordinary bearings have insufficient fatigue resistance and tend to form raceway indentation and rolling element peeling after long-term operation. Roller runout intensifies and directly affects paper uniformity and surface quality. Dryers continuously radiate heat, leading to elevated ambient temperature around bearings, and conventional grease easily oxidizes and cokes at high temperature. Abundant vapor exists in production areas; condensed water on roller surfaces and spray mist easily penetrate into bearings and induce metal rust. Massive fine paper dust and fibers float in the air. Fibers tend to wrap around seal lips and block sealing passages. Paper dust entering cavities mixes with grease and forms soft abrasive medium, continuously wearing rolling contact surfaces. Long-term humid conditions accelerate seal aging and damage and loss of lubricant. Disassembly and assembly of large paper machines are complicated, and shutdown for bearing replacement greatly reduces effective production time and raises factory operation costs.

Focusing on transmission supporting field for papermaking equipment, Japan NMT specially develops high-temperature & moisture resistant tapered roller bearings dedicated for dryers and press rolls on paper production lines to solve industry pain points of ordinary paper machine bearings such as insufficient heat resistance, vulnerability to rust caused by humid vapor, blockage by tangled paper fibers, susceptibility to fatigue under alternating loads and limited service life under continuous papermaking. Taking advantage of bidirectional linear load-bearing structure of tapered rollers, combined with five core upgrades including heat-resistant high-toughness refined bearing alloy steel, multi-layer labyrinth high-temperature moisture & fiber-proof composite sealing, hardening super-finishing strengthening technology for raceways, high-temperature hydrolysis resistant long-life lubrication and precise clearance matching for papermaking conditions, it fully adapts to harsh conditions of dryers and press rolls with high-temperature radiation, humid vapor and adhesive paper dust and fibers. It fundamentally solves problems including high-temperature grease coking, vapor rust, fiber blockage and fatigue wear, stabilizes rotation precision of all kinds of rollers and guarantees long-cycle continuous production of papermaking lines.

Core Product Advantages

1. Bidirectional combined load bearing withstands alternating roller loads and axial thrust: Adopting tapered roller linear contact structure, it bears high-strength radial loads and axial thrust simultaneously with uniform load distribution in contact zones. It buffers load fluctuation during paper machine operation, restrains excessive unilateral raceway wear induced by roller eccentric load, stably controls axial play of roller shafts and improves flatness of finished paper.

2. Heat-resistant high-toughness bearing steel matrix delivers long-term fatigue and rust resistance under high temperature and humidity: Selected high-purity bearing alloy steel specially for papermaking machinery undergoes deep quenching & tempering heat treatments to optimize high-temperature metallographic structure and balance high-temperature toughness and surface hardness. It withstands persistent alternating loads and lowers risks of raceway fatigue damage, rolling element peeling and pitting corrosion in humid vapor environments.

3. Multi-layer labyrinth high-temperature moisture & fiber-proof composite sealing blocks ingress of vapor and paper dust: Equipped with exclusive anti-tangling thickened seal lip & multi-labyrinth sealing structure for papermaking conditions. It is not easily jammed by tangled paper fibers and resists hardening and aging under high temperature. It intercepts condensed vapor, paper dust and fiber debris layer by layer, prevents rust caused by vapor penetration and reduces abrasive wear induced by paper dust mixing with grease.

4. Hardened super-finishing grinding technology for raceways ensures stable operation and temperature control: Deep hardening treatment plus micron-level super-finishing grinding is applied on contact surfaces of raceways and rolling elements to optimize contact profile, improve oil film stability under high-temperature humid conditions, reduce accumulation of frictional heat, slow precision attenuation during long continuous operation, cut roller vibration and enhance finished paper quality.

5. Customized clearance for papermaking conditions & high-temperature hydrolysis resistant lubrication system: Internal clearance is precisely matched according to different operating temperature and load of dryers, press rolls and guide rolls to avoid seizure under low temperature and thermal expansion seizure under sustained high temperature. Matched with special lubrication formula resistant to high temperature, vapor hydrolysis and fiber contamination, it adapts to hot and humid environments in papermaking workshops and extends online lubrication maintenance intervals of equipment.

Application Scenarios

Support bearings on both ends of paper machine dryers, support bearings for press rolls and calender rolls, transmission bearings for guide rolls, transmission parts of rewinders and cutters, heavy-duty supporting positions of roller systems on cultural paper, packaging paper and special paper production lines.

Precision Quality Assurance

NMT tapered roller bearings for papermaking machinery are manufactured strictly in accordance with Japanese light-duty heavy equipment manufacturing standards. Selected special bearing steel with heat resistance, high toughness, moisture and fiber abrasion resistance undergoes continuous high-temperature temperature rise test, humid-heat cycle anti-corrosion test, fiber dust sealing durability test, alternating load fatigue test and continuous heavy-load operation test. The products feature stable bidirectional load capacity, excellent heat and moisture resistance and reliable anti-tangling sealing performance, fully adapting to 24-hour continuous production conditions with high temperature, high humidity and fiber dust in papermaking workshops.

Product Range

Heavy-duty high-temperature resistant tapered roller bearings for dryers, long-life moisture-proof bearings for press rolls, low-vibration wear-resistant bearings for calender rolls, small precision bearings for guide rolls, customized large-size non-standard tapered roller bearings for large high-speed paper machines.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy papermaking roller equipment under working conditions of continuous combined loads, high-temperature radiation from dryers, high-humidity workshop vapor, tangling paper dust and fibers and uninterrupted continuous production, specializing in core technologies of bidirectional load balance, high-temperature temperature rise control, moisture & fiber-proof sealing protection and fatigue wear prevention. With Japanese heat-resistant high-toughness steel heat treatment technology, exclusive anti-tangling moisture-proof sealing technology for papermaking machinery and strict hot-humid dust condition simulation testing system, it accurately solves industry pain points of paper machine bearings such as high-temperature lubrication failure, vapor rust, abrasive wear caused by fiber blockage, frequent shutdown and paper breakage maintenance, supplying high-load, high-temperature resistant, moisture and fiber-proof long-life core roller bearing components for global papermaking equipment manufacturers.