Rubber melt pumps are core pieces of equipment specifically designed for high-viscosity, highly elastic materials such as rubber. Their key features center on adaptability to special operating conditions and functional precision. The following is a detailed analysis of their main features:
High-Pressure Resistance and High-Viscosity Compatibility
Rubber melt viscosity far exceeds that of ordinary plastics (reaching up to 40,000 Pa·s). The melt pump utilizes high-strength gears and pump body materials capable of withstanding high-pressure environments (pressure range: 0–40 MPa), ensuring smooth conveyance of high-viscosity melts. For example, rubber pumps manufactured by Zhengzhou Bate support this viscosity and pressure range.
Precision Structure and Temperature Control Design
The pump housing features an external jacket and internal flow channels, while the pump shaft is equipped with a rotating joint for cooling water circulation, enabling precise temperature control. Special lubrication channels minimize material retention, and the system supports both electric heating and thermal fluid heating for flexible adaptation. In some models, the internal flow channels of the pump body undergo mirror finishing to achieve a high surface finish, making them suitable for heat-sensitive materials.
Precise Metering and Stable Pressure Delivery
Through precision gear meshing clearance design and precise speed control, melt flow is stabilized, effectively eliminating pressure fluctuations in upstream equipment (such as internal mixers and extruders). This ensures the stability of subsequent processes like vulcanization and calendering, thereby improving the dimensional accuracy of the final products.
Optimized Materials and Structure
To accommodate fillers such as carbon black and fibers that may be present in rubber, key components like gears and bearings can be manufactured from high-wear-resistant or corrosion-resistant materials (e.g., tool steel, special alloys) to extend service life. Some pumps feature a dual-shaft drive and water-cooled shaft seal design, further enhancing their suitability for high-temperature and high-pressure operating conditions.
Rubber melt pumps are widely used in extrusion systems for elastomers such as chloroprene rubber (CR), nitrile rubber (NBR), and ethylene propylene diene monomer (EPDM), as well as biodegradable plastics. They are typically installed between the extruder outlet and the die head to provide pressure boosting, pressure stabilization, and metering.
