Hot melt reactor melt pumps are predominantly gear-type structures. Installed at the bottom of hot melt reactors, they serve as core discharge equipment specifically designed for conveying, pressurizing, and metering high-temperature, high-viscosity hot melt adhesives. These pumps are compatible with reactor vacuum conditions, ensuring continuous and efficient production.
As a positive displacement volumetric pump, it operates by an electric motor driving the drive gear through a reducer and universal joint coupling. This gear interaction forms sealed chambers with the pump housing walls. Hot melt adhesive enters the pump's feed zone from the reactor and is drawn into the gear tooth cavities. As the gears continue rotating, the melt is transported into the delivery zone and forcibly propelled forward. When the two gears mesh, the melt in the cavities is squeezed into the discharge zone and ultimately expelled at high pressure through the outlet pipe. Simultaneously, variable frequency speed control adjusts the pump's rotational speed, enabling linear and precise flow rate regulation.
Core Advantages
High operational adaptability: Withstands output pressures up to 35MPa and temperatures ≤400°C; select models endure extreme conditions up to 450°C. Capable of conveying melts with viscosities ranging from 0.01 to 40,000 Pa・s, while maintaining stable self-priming under vacuum conditions (-0.05 to -0.09 MPa), meeting discharge requirements after vacuum devolatilization in hot melt adhesive reactors.
High delivery precision: High-precision gear meshing achieves volumetric efficiency exceeding 98%, with minimal pressure and flow pulsation and linear flow output. Combined with a closed-loop control system featuring pressure sensors and variable-frequency motors, pressure control accuracy reaches ±0.3 bar, significantly reducing parameter deviations in hot melt adhesive products.
Energy-efficient and low-maintenance: Optimized gear and flow path design minimizes shear heat, achieving up to 92% mechanical efficiency to substantially reduce energy consumption per unit output. Dead-zone-free flow paths minimize material residue, while modular construction facilitates cleaning and maintenance. Annual overhauls typically require only bearing and seal component replacement.
This equipment serves as critical machinery in hot melt adhesive production, now standard in applications such as label adhesives, packaging adhesives, furniture edge banding adhesives, and sanitary product adhesives. For instance, in sanitary product production lines, installing this equipment increases line speeds from 120m/min to 250m/min while substantially reducing adhesive strip breakage rates. Furthermore, it extends to high-viscosity melt transportation in industries like resins and chemical fibers, ensuring stable melt supply to enhance product quality.
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