Core equipment of paper production lines including dryer cylinders, press rolls, couch rolls, calendar rolls, pulpers, headbox auxiliary rolls and winders operate under harsh working conditions of continuous radial heavy extrusion loads, high-temperature thermal radiation from dryers, dense workshop steam, splashing pulp sewage, constant high humidity, frequent cold-hot alternation and 24-hour uninterrupted papermaking. Paper production lines demand extremely high continuity. Bearing failure and shutdown easily trigger paper breakage and unbalanced dryer temperature. Paper re-threading takes a long time, leading to massive waste paper and output loss. Ordinary cylindrical roller bearings cannot adapt to hot and humid harsh environment in paper mills, becoming common equipment pain points for paper factories. Continuous extrusion of press rolls generates huge alternating loads. Ordinary bearings have insufficient strength and are prone to raceway indentation and fatigue peeling under long-term stress. Roll runout directly causes uneven paper thickness and surface wrinkles. Dryer surfaces continuously release high temperature and transfer heat to bearing positions. Conventional bearings have limited heat resistance. Long-term high temperature accelerates grease oxidation and carbonization, resulting in bearing overheating, abnormal noise and seizure. High concentration of steam fills workshops, and sewage and pulp filtrate splash continuously. Simple seals cannot block water vapor and sewage from penetrating into bearings. Grease emulsifies and fails upon water absorption, and impurities enter to form abrasive medium and accelerate corrosive wear of raceways. Repeated cold and hot alternation causes continuous condensation inside bearings and accelerates pitting rust. Frequent shutdown maintenance and bearing replacement disrupt papermaking rhythm, sharply increase waste paper volume and raise comprehensive costs of water, electricity, labor and spare parts, restricting production benefits of paper enterprises.

Focusing on transmission supporting field for papermaking industry, Japan NMT specially develops heavy-duty high-temperature moisture and sewage corrosion resistant long-life cylindrical roller bearings dedicated for paper making machinery to solve industry pain points of ordinary paper machine bearings such as insufficient load capacity, easy failure under high temperature, easy ingress of steam and sewage, rapid rusting in humid environment and short service life. Through five core upgrades including heat-resistant high-strength alloy steel base material, multi-layer steam-proof composite sealing, surface vapor-resistant passivation anti-corrosion technology, wide-temperature hydrolysis-resistant long-life lubrication and alternating load stress equalization optimization, it fully adapts to hot-humid heavy-load working conditions of dryers and press rolls. It fundamentally solves problems including bearing vapor rust, high-temperature lubrication failure, impact wear and sewage ingress, supporting long-term stable continuous production of paper machines.

Core Product Advantages

1. Heat-resistant high-strength alloy steel base material withstands continuous extrusion heavy loads: Adopting heat-resistant alloy steel specially for papermaking heavy industry with deep quenching & tempering heat treatment to improve structural toughness and fatigue resistance under high temperature. It bears long-term continuous extrusion loads and periodic impact of press rolls, effectively restrains raceway plastic deformation and surface peeling and maintains stable running precision of rollers.

2. Multi-layer steam-proof composite sealing blocks ingress of sewage and vapor: Equipped with exclusive multi-layer labyrinth and wear-resistant lip composite sealing system for papermaking conditions. It resists aging and deformation under high-low temperature steam environments, blocks pulp sewage and hot humid steam from penetrating into bearing cavities layer by layer, prevents grease emulsification by water absorption and lowers risks of internal corrosion and abrasive wear.

3. Surface vapor-resistant passivation anti-corrosion technology resists humid corrosion: Precision passivation strengthening treatment is applied on bearing inner/outer rings and rolling elements to seal micro-pores on metal surfaces, improve resistance against pitting corrosion caused by condensed water and sewage filtrate, inhibit rust development under long-term high humidity and extend service life in humid working conditions.

4. Wide-temperature hydrolysis-resistant long-life lubrication system prevents coking at high temperature: Custom lubrication formula matched with hot-humid papermaking conditions features excellent hydrolysis resistance and steam wash resistance. It hardly dries and carbonizes under high temperature and does not solidify at low temperature, continuously forms stable protective oil film, reduces overheating caused by dry friction and extends lubrication maintenance intervals.

5. Alternating load optimized structure evenly disperses extrusion stress: Optimizing roller arrangement and internal clearance matching to improve load distribution and relieve stress concentration caused by continuous extrusion during pressing process. Precision attenuates slowly during long-term operation, lowers roll runout and reduces finished product defects such as paper wrinkles and thickness deviation.

Application Scenarios

Paper machine dryer cylinders, press rolls, couch rolls, calendar rolls, pulpers, winders, rewinders, headbox conveying rolls, complete waste paper pulping and papermaking machinery.

Precision Quality Assurance

NMT heavy-duty cylindrical roller bearings for paper making machinery are manufactured strictly in accordance with Japanese papermaking equipment manufacturing standards. Selected special bearing steel with heat resistance, moisture resistance and impact resistance undergoes continuous heavy-load durability test, hot-humid steam corrosion test, sewage spray sealing test, cold-hot cycle fatigue test and long-term high-temperature temperature rise stability test. The products feature outstanding load capacity, reliable moisture-proof sealing, excellent high-temperature and corrosion resistance, fully adapting to all-weather continuous heavy-load papermaking conditions with high temperature, high humidity and splashing sewage in paper workshops.

Product Range

High-temperature cylindrical roller bearings for dryer cylinders, heavy-duty moisture-resistant bearings for press rolls, low-noise long-life bearings for couch and calendar rolls, sewage corrosion resistant bearings for pulpers, precision transmission bearings for winders and rewinders, customized non-standard heavy-load bearings for paper machinery.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy-duty pulp & paper industry under high-temperature high-humidity, steam sewage corrosion and continuous extrusion heavy-load working conditions, specializing in performance optimization under scenarios of hot-humid environment, alternating cold and heat and continuous alternating loads. With Japanese heat-resistant steel heat treatment technology, exclusive steam-proof sealing technology for papermaking working conditions and strict hot-humid condition simulation testing system, it accurately solves industry problems of paper machine bearings such as vapor rust, high-temperature carbonization, sewage ingress and impact wear failure, supplying high-load, high-temperature resistant, moisture-proof and anti-corrosion long-life core transmission components for global pulp, paper and specialty paper processing industries.