Single & twin-screw extruders, underwater pelletizers, internal mixers and open mills are core rubber and plastic processing equipment. Screw support seats, gearbox output ends and pelletizing transmission positions operate under harsh working conditions: ultra-large continuous axial thrust and radial extrusion loads on screws, persistent high-temperature radiation from barrels, fine resin dust volatilized from raw materials, periodic fluctuating loads caused by shearing and mixing and non-stop all-weather compounding, extrusion and pelletizing. Rubber and plastic extrusion lines require extremely high continuity. Once main machine bearing failure leads to shutdown, molten materials tend to cool and agglomerate. Cleaning screws takes a long time, large quantities of raw materials will be scrapped, and restart procedures are complicated, directly causing heavy raw material waste and production losses. Ordinary tapered roller bearings cannot adapt to harsh high-temperature environments with accumulated resin dust in rubber and plastic workshops, becoming a common pain point for rubber & plastic equipment manufacturers and processors. During conveying molten materials, screws bear huge axial thrust and radial loads continuously, and feed fluctuation brings alternating impact. Ordinary bearings have insufficient fatigue resistance and tend to form raceway indentation and rolling element surface peeling under long-term cyclic loads, triggering screw vibration and resulting in dimensional fluctuation and surface defects of extruded products. Extruder barrels continuously radiate heat, leading to long-term high ambient temperature around bearings. Conventional grease easily oxidizes and carbonizes under high temperature, leading to excessive temperature rise and seizure of bearings. Fine resin dust volatilized and peeled off during production features strong adhesion. Simple seals cannot provide effective barrier. Dust gradually penetrates seal gaps, enters bearing housings and mixes with grease to form abrasive medium that continuously wears raceways and rolling elements. High temperature accelerates hardening and elasticity loss of sealing materials, making dust ingress easier. Disassembly of large extruder main machines is complicated, and shutdown for bearing replacement and screw cleaning greatly shortens effective production hours and continuously increases operation costs of rubber and plastic factories.

Focusing on transmission supporting field for rubber & plastic extrusion equipment, Japan NMT specially develops high-temperature dust-proof heavy-duty tapered roller bearings dedicated for single & twin-screw extruders and pelletizers to solve industry pain points of ordinary extruder bearings such as insufficient heat resistance, easy accumulation and ingress of sticky resin dust, fatigue spalling induced by screw axial loads, carbonization and coking of lubricant under high temperature and limited service life under continuous extrusion operation. 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 anti-sticky dust composite sealing, deep-hardening super-finishing strengthening technology for raceways, high-temperature anti-resin-contamination long-life lubrication and precise clearance matching for rubber & plastic extrusion conditions, it fully adapts to harsh extrusion conditions with high-temperature radiation and sticky resin dust interference. It fundamentally solves problems including high-temperature grease coking, abrasive wear by dust, fatigue spalling and seal hardening & leakage, stabilizes rotation precision of screws and guarantees long-cycle continuous production of rubber & plastic compounding, extrusion and pelletizing lines.

Core Product Advantages

1. Bidirectional ultra-large combined load bearing withstands screw axial thrust and dynamic extrusion load: Adopting tapered roller linear contact structure, it bears high-strength radial extrusion loads and continuous axial thrust simultaneously with uniform load distribution in contact zones. It effectively buffers alternating impact caused by feed fluctuation, balances eccentric loads of screws, restrains local overload wear on unilateral raceways and stably controls axial play of screws to ensure stable dimension of extruded products and reduce defects such as uneven thickness and strip vibration.

2. Heat-resistant high-toughness bearing steel matrix delivers long-term fatigue and wear resistance under high temperature: Selected high-purity heat-resistant bearing alloy steel specially for heavy rubber & plastic extrusion equipment undergoes deep quenching & tempering heat treatments to optimize metallographic structure under thermal conditions, improve matrix toughness and fatigue resistance under sustained high temperature. It withstands long-term alternating loads of screws, delays raceway fatigue damage and surface peeling of rolling elements and lowers risks of pitting corrosion under high temperature.

3. Multi-layer labyrinth high-temperature anti-sticky resin dust composite sealing blocks ingress and accumulation of fine resin particles: Equipped with exclusive low-adhesion thickened seal lip & multi-labyrinth protective structure for extrusion conditions. It resists hardening and elasticity loss under high temperature and is not easy to stick to molten resin dust. It intercepts fine resin particles layer by layer, prevents dust penetration into housings and grease contamination, and avoids persistent abrasive wear induced by sticky powder.

4. Deep-hardening super-finishing grinding technology for raceways reduces frictional temperature rise and suppresses screw vibration: Deep hardening treatment plus micron-level super-finishing grinding is applied on contact surfaces of raceways and rollers to optimize contact profile, improve oil film stability under high temperature, reduce heat accumulation under continuous loads, slow precision attenuation after years of continuous operation, lower screw vibration and enhance appearance quality of extruded profiles and pellets.

5. Customized clearance for extrusion conditions & high-temperature anti-contamination long-life lubrication system: Internal clearance is precisely matched according to different operating temperature and load of screw supports and pelletizing transmissions of extruders to avoid seizure under low temperature and thermal expansion seizure under sustained high temperature. Matched with special lubrication formula resistant to high temperature and resin dust contamination, it adapts to persistent high-temperature environments in rubber & plastic workshops and extends online lubrication maintenance intervals of equipment.

Application Scenarios

Screw support bearings for single and twin-screw extruders, transmission bearings for extrusion gearboxes, cutter shaft support bearings for underwater pelletizers, transmission bearings for internal mixers and open mills, heavy-duty transmission supporting positions of all plastic modification, pelletizing, rubber compounding and extrusion production lines.

Precision Quality Assurance

NMT tapered roller bearings for rubber & plastic extrusion pelletizing equipment are manufactured strictly in accordance with Japanese heavy rubber & plastic equipment component manufacturing standards. Selected special bearing steel with heat resistance, high toughness, low adhesion and dust & wear resistance undergoes continuous high-temperature temperature rise test, resin dust adhesion sealing durability test, alternating axial load fatigue test, continuous heavy-load operation test and high-low temperature cycle aging test. The products feature outstanding bidirectional load capacity, excellent thermal stability and reliable long-term anti-sticky dust sealing performance, fully adapting to 24-hour non-stop extrusion and pelletizing conditions with high temperature and accumulated resin dust in rubber & plastic workshops.

Product Range

Heavy-duty high-temperature resistant tapered roller bearings for twin-screw extruders, long-life dust-proof bearings for single screw supports, wear-resistant transmission bearings for pelletizers, low-vibration bearings for internal mixers, customized large-size non-standard tapered roller bearings for complete large extrusion equipment.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy rubber & plastic compounding and extrusion equipment under working conditions of ultra-large axial combined loads, high-temperature radiation from barrels, accumulation of sticky resin dust, periodic alternating loads on screws and uninterrupted continuous extrusion and pelletizing, specializing in core technologies of bidirectional load balance optimization, high-temperature temperature rise control, low-adhesion dust-proof sealing protection and fatigue wear prevention. With Japanese heat treatment technology for heat-resistant high-toughness steel, exclusive high-temperature resin dust resistant sealing technology for extrusion machinery and strict high-temperature dust condition simulation durability testing system, it accurately solves industry pain points of extruder bearings such as carbonization and coking of lubricant at high temperature, abrasive wear failure by resin dust, screw axial play and vibration, raw material scrapping caused by shutdown cleaning, supplying high-load, high-temperature resistant, dust and wear-resistant long-life core transmission bearing components for global rubber and plastic extrusion machinery manufacturers.