Core equipment of paper production lines including dryers, press rolls, vacuum couch rolls, rewinders, pulpers and roll systems matched with headboxes operate under harsh working conditions: continuous alternating extrusion loads, high-temperature radiation from steam-heated dryers, pervasive pulp mist in workshops, floating fine fibers and fillers, high humidity atmosphere, splashing stock wastewater and uninterrupted 24-hour papermaking. Paper production lines demand extremely high continuity. Sudden bearing failure and shutdown will cause web breakage and massive waste of wet paper sheets. It takes a long time to reheat dryers after cooling down, leading to heavy loss of raw materials and finished products and seriously delaying delivery schedules. Ordinary cylindrical roller bearings cannot adapt to high-temperature, high-humidity and fiber-stock corrosive environments in paper mills, becoming a common industry pain point. During operation, press rolls and couch rolls bear huge continuous extrusion loads and periodic vibration. Ordinary bearings lack sufficient fatigue resistance and tend to form raceway indentation and surface peeling under long-term cyclic stress, resulting in roll runout, paper wrinkling and uneven thickness. Steam inside dryers continuously radiates high temperature and transfers heat to bearing positions. Conventional bearings have limited heat resistance. High temperature accelerates grease oxidation and coking, easily triggering bearing overheating and seizure. Production areas are filled with pulp mist all year round. Fine fibers and calcium carbonate fillers suspend in the air. Simple seals cannot block fiber debris from penetrating into bearings. Fibers wind and block lubrication passages, and water vapor mixes with grease to cause emulsification and failure. Stock wastewater containing chemicals splashes frequently in pulping and pressing zones and easily induces pitting and rust inside bearings. Temperature fluctuates day and night in workshops, leading to repeated condensation inside bearing cavities and continuous acceleration of corrosion. Maintenance procedures for paper machines are complicated and shutdown losses are huge. Frequent bearing replacement continuously increases operation costs and paper waste.

Focusing on transmission supporting field for paper making equipment, Japan NMT specially develops heavy-duty high-temperature moisture & pulp resistant long-life cylindrical roller bearings dedicated for paper machinery to solve industry pain points of ordinary paper mill bearings such as easy failure under high temperature, easy ingress of moisture and fibers, vulnerability to corrosion by stock chemicals, susceptibility to fatigue under long-term extrusion loads and short service life in humid environments. Through five core upgrades including heat-resistant corrosion-resistant high-strength alloy steel matrix, multi-layer labyrinth moisture & fiber composite sealing, surface anti-corrosion strengthening heat treatment for raceways, hydrolysis-resistant high-temperature long-life lubrication and extrusion alternating load stress equalization optimization, it fully adapts to heavy-load, high-temperature, high-humidity and pulp-fiber erosion working conditions of dryers, press rolls and rewinding equipment. It fundamentally solves problems including bearing high-temperature seizure, fiber blockage, moisture rust and fatigue wear, stabilizes roll operation precision, reduces web breaks and wrinkling defects, and guarantees long-term continuous production of paper lines.

Core Product Advantages

1. Heat-resistant corrosion-resistant high-strength alloy steel matrix withstands continuous extrusion heavy loads: Adopting heat-resistant corrosion-resistant bearing alloy steel specially for paper dryers and press equipment with multiple quenching & tempering strengthening heat treatments to improve compressive strength, toughness and chemical corrosion resistance under high temperature and high humidity. It bears long-term continuous alternating extrusion loads of roll systems and effectively restrains raceway plastic deformation and fatigue peeling.

2. Multi-layer labyrinth moisture & fiber composite sealing blocks ingress of mist and fibers: Equipped with exclusive multi-layer labyrinth and anti-winding wear lip sealing system for paper making conditions. It resists aging and deformation under high temperature, blocks pulp mist, fine fibers and filler particles from entering bearing cavities, prevents fibers from winding and blocking lubrication passages, avoids grease emulsification and deterioration caused by water absorption, and lowers risks of internal rust and abrasive wear.

3. Surface anti-corrosion strengthening heat treatment for raceways resists erosion by stock chemicals: Surface hardening anti-corrosion strengthening treatment is applied on raceways and rolling elements to optimize metallographic structure, enhance surface hardness, pitting resistance and resistance against chemical erosion. It slows corrosive wear under long-term scouring by water vapor and pulp medium and extends bearing service life.

4. Hydrolysis-resistant high-temperature long-life lubrication system adapts to hot and humid workshop environment: Custom lubrication formula developed for high-temperature and high-humidity paper making conditions features excellent high-temperature oxidation resistance, hydrolysis resistance and anti-emulsification performance. It is not easily diluted and invalidated by pulp water vapor, maintains stable protective oil film for a long time, reduces dry friction and moisture corrosion under high temperature, and extends lubrication maintenance intervals.

5. Optimized structure for alternating extrusion loads evenly disperses vibration stress: Optimizing roller arrangement and internal clearance parameters to improve load distribution during continuous extrusion operation of roll systems, relieve local stress concentration caused by periodic vibration, slow precision attenuation from long-term continuous operation, maintain stable roll running and reduce risks of paper wrinkling and web breakage.

Application Scenarios

Paper dryers, press rolls, vacuum couch rolls, guide rolls, rewinders, pulpers, roll systems for pulp pumps, toilet paper production lines, roll shaft supporting and transmission parts of complete paper machines for carton board and printing paper.

Precision Quality Assurance

NMT heavy-duty cylindrical roller bearings for paper making machinery are manufactured strictly in accordance with Japanese paper equipment manufacturing standards. Selected special bearing steel with heat resistance, fatigue resistance, moisture corrosion resistance and anti-fiber-winding performance undergoes continuous extrusion durability test, moisture & fiber sealing test, high-temperature temperature rise durability test, wastewater spray corrosion test and high-low temperature cycle fatigue test. The products feature outstanding load capacity, stable heat resistance and excellent sealing performance against moisture and fibers, fully adapting to papermaking conditions with steam high temperature, heavy humid mist, splashing pulp stock and 24-hour continuous paper production in paper mills.

Product Range

High-temperature heavy-duty cylindrical roller bearings for dryers, vibration-resistant long-life bearings for press rolls, low-noise precision bearings for rewinders, pulp corrosion resistant bearings for pulpers, moisture-proof wear-resistant bearings for couch rolls and guide rolls, customized non-standard heavy-load bearings for paper making equipment.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy paper machinery under working conditions of steam high-temperature radiation, high-humidity pulp mist, fiber impurity erosion and continuous extrusion loads, specializing in performance optimization under scenarios of hot and humid environments, fiber winding blockage, corrosion by pulp chemicals and periodic vibration. With Japanese heat-resistant corrosion-resistant steel heat treatment technology, exclusive moisture & fiber proof sealing technology for paper machines and strict hot-humid working condition simulation testing system, it accurately solves industry problems of paper mill bearings such as high-temperature coking seizure, fiber blockage, moisture rust, fatigue abrasive wear and frequent maintenance replacement, supplying high-load, high-temperature resistant, moisture and corrosion resistant long-life core transmission components for global producers of printing paper, carton board, tissue paper and specialty paper.