What are the key features of melt pumps for rubber hose extruders?

The core features of melt pumps for rubber hose extruders (rubber melt pumps) are precise pressure control and stable delivery. They effectively address the processing challenges posed by the high viscosity and tendency of rubber melt to stick to the walls, while ensuring dimensional accuracy and continuous production of rubber hoses.

1. Structural Design Adapted to Rubber Processing Characteristics

High-viscosity and high-temperature resistance: The pump body is made of wear-resistant alloy, and the inner walls are treated with a special coating. This allows it to withstand the temperatures commonly encountered in rubber processing (180–250°C) while resisting erosion and wear caused by high-viscosity rubber melt (typically 10⁴–10⁶ cP), thereby preventing delivery issues caused by melt adhesion to the walls.

Optimized Gear Design: The use of an involute helical gear structure allows for smoother meshing and delivery of rubber melt compared to standard melt pumps. This reduces pressure fluctuations caused by the high elasticity of the melt and accommodates the rheological properties of various rubber types, such as natural rubber and nitrile rubber.

2. Core Functions for Ensuring Rubber Hose Quality

Precise Pressure and Flow Stabilization: Utilizing the positive displacement principle of gear meshing, pressure fluctuations in the melt are controlled within a very narrow range. This prevents issues such as uneven wall thickness and outer diameter deviations caused by unstable pressure during rubber hose extrusion, making it particularly suitable for the production of high-pressure rubber hoses and precision rubber tubing.

Enhanced Melt Homogenization: The shearing and mixing action of the internal gears further breaks down microscopic agglomerates in the rubber melt, improving the uniformity of melt temperature and composition. This reduces defects such as bubbles and impurity spots in the finished rubber tubing, thereby increasing the product yield rate.

3. Application Advantages for Production Line Efficiency

Compatibility with High-Filler Formulations: For rubber formulations containing fillers such as carbon black and glass fiber, the pump’s wider flow channels and precisely controlled gear clearances effectively prevent filler particles from blocking the flow path, making it suitable for the extrusion process of reinforced rubber tube layers.

Reduced Extruder Load: By taking over the tasks of melt conveyance and pressurization from the extruder screw, the pump reduces the extruder’s load by 20%–30%. This minimizes screw wear, extends equipment lifespan, and allows the extruder to operate at optimal speeds, thereby improving overall production efficiency.

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