Core plastic and rubber processing equipment including single & twin screw extruders, internal mixers, open mills, granulators, calenders and film blowing machines operate under harsh working conditions of continuous torsional heavy loads, persistent heat conduction from barrels, diffusion of fine plastic powder and additive volatiles, fine resin dust generated by material friction, alternating cold and hot temperature and uninterrupted 24-hour continuous mixing and extrusion. Plastic and rubber production lines require high continuity. Once bearing failure occurs, it will cause screw jamming, unstable extrusion pressure and uneven product thickness. In severe cases, the whole machine shuts down. Molten material inside the barrel cools and solidifies. Cleaning takes a long time, leading to massive raw material waste and production interruption. Ordinary cylindrical roller bearings cannot adapt to high-temperature and dust-adhesive environments in plastic and rubber workshops, becoming a common industry pain point. Continuous huge torsional loads and periodic alternating stress are generated during screw extrusion and internal mixing. Ordinary bearings have insufficient strength and are prone to raceway fatigue pitting and surface peeling under long-term stress, resulting in screw eccentricity and defective extruded products. Molten materials inside barrels continuously transfer high temperature outwards to bearing positions. Conventional bearings have limited heat resistance. High temperature accelerates grease oxidation and coking carbonization, easily triggering bearing overheating and seizure. A large amount of fine resin powder, carbon black and additive dust are generated during production. Such dust easily melts and adheres under heat. Simple seals cannot block dust from penetrating into bearings. Dust sticks to raceways and rolling elements after heating, aggravating friction and wear and blocking lubrication channels. Equipment heats up and cools down during intermittent shutdowns, leading to repeated condensation inside bearings. Dust mixed with water vapor forms viscous dirt and accelerates component corrosion. Procedures for cleaning solidified materials inside barrels and replacing bearings are complicated. Frequent shutdown and bearing replacement greatly increase raw material loss and operation and maintenance costs.

Focusing on transmission supporting field for plastic and rubber processing equipment, Japan NMT specially develops heavy-duty high-temperature resin-dust resistant long-life cylindrical roller bearings dedicated for plastic and rubber machinery to solve industry pain points of ordinary plastic & rubber bearings such as easy coking and seizure under high temperature, easy adhesion and ingress of resin dust, vulnerability to fatigue under continuous torsional loads and short service life under temperature variation. Through five core upgrades including heat-resistant high-strength alloy steel matrix, multi-layer high-temperature anti-adhesive dust composite sealing, low-adhesion precision polishing technology for raceways, high-temperature anti-coking volatile-resistant long-life lubrication and torsional load stress equalization optimization, it fully adapts to heavy-load, high-temperature and resin dust adhesion working conditions of extrusion, mixing and granulation equipment. It fundamentally solves problems including high-temperature lubrication failure, dust adhesion jamming and fatigue wear of bearings, stabilizes screw operation precision and extrusion pressure, and guarantees sustained stable production of plastic and rubber products.

Core Product Advantages

1. Heat-resistant high-strength alloy steel matrix withstands continuous torsional heavy loads: Adopting heat-resistant bearing alloy steel specially for plastic and rubber extrusion equipment with deep quenching & tempering strengthening heat treatments to improve torsional strength and fatigue resistance under high temperature. It bears long-term continuous alternating torsional loads of screws, effectively restrains raceway plastic deformation and fatigue peeling and maintains stable coaxial precision of screws.

2. Multi-layer high-temperature anti-adhesive dust composite sealing blocks ingress and adhesion of resin dust: Equipped with exclusive multi-layer labyrinth and high-temperature wear-resistant lip sealing system for plastic & rubber working conditions. It resists softening and aging under high temperature and features anti-resin-adhesion surface property. It intercepts molten fine resin powder, carbon black and additive dust layer by layer, prevents dust from heating, adhering and blocking lubrication channels, and lowers risks of internal abrasive wear.

3. Low-adhesion precision polishing technology for raceways reduces dust accumulation: Micron-level precision polishing treatment is applied on raceways and rolling elements to lower surface adhesion, reduce attachment and accumulation of resin dust and carbon black particles, slow fouling formation during long-term operation, restrain rising friction resistance and maintain stable low-noise operation for a long period.

4. High-temperature anti-coking volatile-resistant long-life lubrication system resists additive corrosion: Custom lubrication formula developed for high-temperature plastic and rubber extrusion conditions features excellent high-temperature oxidation resistance and resistance against erosion by additive volatiles. It hardly dries and cokes under long-term high temperature and is not easily diluted and deteriorated by plastic volatile media, continuously forms stable protective oil film and greatly extends lubrication maintenance intervals.

5. Optimized structure for torsional loads evenly disperses alternating stress: Optimizing roller arrangement and internal clearance matching to improve load distribution under continuous screw torsion, relieve periodic stress concentration, slow precision attenuation during long-term continuous operation, stabilize extrusion pressure and reduce dimensional fluctuation defects of plastic products.

Application Scenarios

Single screw extruders, twin screw extruders, internal mixers, open mills, granulators, calenders, film blowing machines, plastic recycling granulation production lines, screw and roller supporting transmission parts of complete rubber mixing equipment.

Precision Quality Assurance

NMT heavy-duty cylindrical roller bearings for plastic and rubber machinery are manufactured strictly in accordance with Japanese plastic & rubber equipment manufacturing standards. Selected special bearing steel with heat resistance, fatigue resistance and anti-dust-adhesion performance undergoes continuous torsion durability test, high-temperature dust sealing test, long-term temperature rise test, high-low temperature cycle aging test and volatile medium corrosion resistance test. The products feature strong load capacity, stable heat resistance and outstanding sealing performance against dust adhesion, fully adapting to 24-hour continuous mixing and extrusion production conditions with high temperature and widespread resin dust in plastic and rubber workshops.

Product Range

High-temperature heavy-duty cylindrical roller bearings for twin screw extruders, anti-fatigue long-life bearings for internal mixers, dust-proof wear-resistant bearings for granulators, low-vibration precision bearings for open mills and calenders, dust-proof bearings for recycling granulation equipment, customized non-standard heavy-load bearings for plastic and rubber equipment.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy plastic & rubber extrusion and mixing under working conditions of continuous torsional loads, high-temperature resin dust adhesion and corrosive volatile chemical additives, specializing in performance optimization under scenarios of high-temperature heat conduction, viscous dust pollution and alternating torsional loads. With Japanese heat-resistant steel heat treatment technology, exclusive high-temperature anti-adhesive dust sealing technology for plastic & rubber equipment and strict high-temperature working condition simulation testing system, it accurately solves industry problems of plastic & rubber bearings such as high-temperature coking seizure, resin dust adhesion jamming, fatigue abrasive wear and frequent maintenance replacement, supplying high-load, high-temperature resistant and dust-adhesion resistant long-life core transmission components for global plastic modification, rubber mixing, plastic granulation and film extrusion industries.