Melt Pumps in Silicone Tube Extrusion Production Lines
In silicone tube extrusion production lines, melt pumps serve as both precision pressure stabilizers and guardians of constant flow. Leveraging core advantages such as stable pressure delivery, precise metering, and melt homogenization, they significantly enhance the dimensional accuracy, surface finish, and overall production efficiency of silicone tubes. As such, they are essential standard equipment for the mass production of high-end silicone tubes and medical-grade silicone catheters.
Extruder Melt Pumps
Silicone raw materials are generally characterized by high viscosity, strong thermal sensitivity, and shear sensitivity. Traditional single-screw extrusion processes are easily affected by fluctuations in feed rate, temperature drift, and backpressure changes, leading to pressure pulsations. This results in issues such as uneven wall thickness, eccentricity, rippling, poor surface appearance, and high scrap rates. Installing a melt pump addresses these common pain points in silicone extrusion at the source, enabling stable production, high-quality output, energy savings, and improved efficiency.
The Core Role of Melt Pumps in Silicone Tube Extrusion
1. Isolating fluctuations and stabilizing melt pressure for smoother extrusion
Melt pumps feature a positive-displacement, forced-feed design that isolates pressure fluctuations from the extruder upstream of the pump, delivering a stable and continuous flow of silicone melt to the die. Outlet pressure fluctuations can be controlled within **±1%**, effectively eliminating pulsations, striations, and wall thickness variations, resulting in improved product concentricity and higher batch consistency.
Extruder Melt Pump
2. Precise metering locks flow rate, strictly controlling dimensional deviations
The melt pump’s output flow rate is linearly proportional to its rotational speed; adjusting the pump speed allows for precise control of the extrusion volume, enabling closed-loop online control of wall thickness. Compared to traditional extrusion methods, silicone tube wall thickness deviation is optimized from **±5% to ±8% to ±1%**, significantly improving yield and material utilization rates. This makes it ideal for the production of thin-walled, high-precision, medical-grade silicone tubing.
3. Secondary homogenization of the melt to enhance transparency and mechanical strength
During the forced conveyance via gear meshing, the silicone melt undergoes further dispersion, homogenization, and degassing to eliminate bubbles. This reduces crystal spots, air bubbles, and agglomerated impurities, resulting in products with better light transmission, smoother inner walls, and superior tensile and pressure resistance. These products meet the stringent requirements of high-barrier applications such as medical, food, and water purification industries.
Plastic Extruder Melt Pump
4. Reduced Load and Stress, Extending the Service Life of the Extruder
With the addition of the pump, pressure generation is handled by the pump, allowing the extruder to focus on plasticization and mixing. The main unit operates at low pressure over the long term, reducing wear on the screw and barrel, lowering the load, and extending the major overhaul cycle to 1.5–2 times the original duration, resulting in lower overall operating and maintenance costs.
5. Excellent High-Temperature and High-Viscosity Resistance, Suitable for Demanding Silicone Applications
The entire unit is manufactured from high-temperature-resistant, wear-resistant, and corrosion-resistant materials, capable of withstanding operating conditions up to **400°C**. It is suitable for the continuous extrusion of high-temperature, high-viscosity, filled, and modified silicone materials, ensuring stable operation, minimal downtime, and excellent continuity.
Melt Pump
6. Reduced Energy Consumption, Increased Line Speed, and Enhanced Production Capacity Benefits
Following process optimization, the overall energy consumption of the entire line has decreased by 15%–20%. At the same time, the maximum extrusion speed has increased by over 30%, making it more suitable for lines involving powder addition, color matching, and the co-extrusion of filled silicone rubber. The longer it runs, the more energy-efficient and faster it becomes.
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