Core plastic and rubber processing equipment such as single & twin-screw extruders, internal mixers, open mills, granulators, calenders and rubber vulcanization equipment operate under harsh working conditions including continuous alternating heavy extrusion loads, high-temperature thermal radiation from barrels, corrosive volatile additives released by heated raw materials, pervasive high-temperature oil vapor, periodic impact loads and long-time uninterrupted continuous mixing. Plastic and rubber production lines demand high continuity. Once bearing failure causes shutdown, high-temperature plastic and rubber materials inside barrels easily solidify and agglomerate. Cleaning takes tremendous time and leads to massive material scrap and severe production loss. Ordinary cylindrical roller bearings can hardly adapt to complex environments in plastic and rubber workshops, becoming prominent obstacles restricting production. Continuous huge radial loads and intermittent impact are generated during screw extrusion and material mixing. Ordinary bearings have insufficient matrix toughness and tend to suffer raceway indentation and surface peeling under long-term cyclic stress, resulting in screw runout and uneven thickness of extruded products. Continuous high-temperature radiation from equipment barrels transfers heat to bearing positions. Conventional bearings have limited heat resistance. Long-term high temperature accelerates grease oxidation and carbonization, triggering excessive temperature rise, abnormal noise and seizure of bearings. Plastic and rubber raw materials contain plasticizers, stabilizers and other additives. Volatile corrosive vapor forms under high temperature. Simple seals cannot block vapor penetration. Vapor invades bearings, corrodes raceways and rolling elements and contaminates lubricating grease to accelerate lubrication failure. Cooled volatile materials form viscous carbon deposits around seals and block sealing gaps, further aggravating medium penetration. Frequent shutdown for carbon deposit cleaning and bearing replacement disrupts continuous extrusion and mixing rhythm, greatly increasing raw material loss and operation and maintenance costs for plastic and rubber enterprises.

Focusing on transmission supporting field for plastic and rubber processing equipment, Japan NMT specially develops heavy-duty high-temperature chemical-corrosion resistant long-life cylindrical roller bearings dedicated for plastic and rubber machinery to solve industry pain points of ordinary plastic-rubber bearings including insufficient load capacity, easy carbonization under high temperature, corrosion by volatile additives, seal blockage by carbon deposits and short service life. Through five core upgrades including heat-resistant alloy steel base material, high-temperature anti-penetration composite sealing, surface chemical-resistant passivation protection, high-temperature anti-oxidation long-life lubrication and alternating load stress equalization optimization, it fully adapts to high-temperature heavy-load corrosive working conditions of extruders, internal mixers and granulators. It fundamentally solves problems including bearing lubrication failure under high temperature, medium corrosion, impact wear and carbon deposit penetration, providing reliable transmission guarantee for continuous plastic and rubber extrusion & mixing production lines.

Core Product Advantages

1. Heat-resistant alloy steel base material withstands continuous heavy loads and thermal stress: Adopting heat-resistant alloy steel specially for plastic and rubber heavy industry with multiple forging and quenching & tempering heat treatments to improve structural strength and fatigue resistance under high temperature. It can bear alternating impact loads generated by screw extrusion and material mixing for a long time and effectively restrain raceway plastic deformation and fatigue peeling.

2. High-temperature anti-penetration composite sealing blocks corrosive vapor intrusion: Equipped with exclusive high-temperature resistant sealing components for plastic and rubber working conditions, maintaining stable shape under high temperature. Multi-layer barriers prevent penetration of volatile additive vapor and high-temperature oil fume into bearing cavities, lower internal chemical corrosion risk and slow down seal failure caused by viscous carbon accumulation.

3. Surface chemical-resistant passivation technology resists additive erosion: Special passivation strengthening treatment is applied on bearing contact surfaces to enhance resistance against erosion by plasticizers and volatile chemical media, inhibit pitting rust induced by oil vapor and slow down high-temperature corrosive wear, extending bearing service life under chemical volatile environments.

4. High-temperature anti-oxidation long-life lubrication system prevents coking and carbonization: Custom lubrication formula optimized for high-temperature plastic and rubber extrusion conditions features excellent anti-oxidation and medium wash resistance. It hardly dries, carbonizes or fails under prolonged high temperature, continuously forms stable protective oil film, reduces risks of overheating due to dry friction and extends lubrication maintenance intervals.

5. Alternating load optimized structure evenly disperses impact stress: Optimizing roller arrangement and internal clearance matching to improve load distribution, relieve local stress concentration caused by intermittent impact. Precision attenuates slowly during long-term operation, stabilizes screw running status and guarantees uniform dimension of extruded profiles and rubber products.

Application Scenarios

Single & twin-screw extruders, internal mixers, open mills, plastic granulators, rubber calenders, vulcanization equipment, plastic film production lines, complete sets of extrusion equipment for plastic pipes and profiles.

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, impact resistance and chemical corrosion resistance undergoes continuous high-temperature durability test, volatile medium corrosion test, carbon deposit resistance sealing test, alternating impact fatigue test and long-term temperature rise stability test. The products feature outstanding load capacity, stable heat resistance, reliable chemical corrosion resistance and long-lasting sealing performance, fully adapting to continuous production conditions with high temperature, corrosive vapor and continuous heavy load impact in plastic and rubber workshops.

Product Range

High-temperature heavy-duty cylindrical roller bearings for extruders, impact-resistant long-life bearings for internal mixers, oil-vapor corrosion resistant bearings for granulators, high-precision transmission bearings for calenders, wide-temperature stable bearings for vulcanization equipment, customized non-standard ultra-heavy-load bearings for plastic and rubber machinery.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for plastic & rubber processing under environments of high-temperature chemical volatile media and alternating heavy impact loads, specializing in performance optimization under scenarios of high-temperature thermal radiation, corrosive oil vapor and intermittent impact loads. With Japanese heat-resistant steel heat treatment technology, exclusive high-temperature sealing technology for plastic and rubber working conditions and strict corrosive environment simulation testing system, it accurately solves industry problems of plastic and rubber bearings such as high-temperature carbonization, chemical medium corrosion, carbon deposit penetration and impact wear failure, supplying high-load, high-temperature resistant and chemical-corrosion resistant long-life core transmission components for global plastic modification, rubber mixing and profile extrusion industries.