Analysis of the Advantages of Melt Pumps in Silicone Extrusion Molding

The melt gear pumps for silicone seal strip extrusion plays a crucial role in the silicone extrusion molding process, with its characteristics and advantages mainly manifested in the following aspects:

I. Characteristics

Working Principle: The silicone melt pump operates by relying on the change in working volume caused by the mutual engagement of the driving and driven gears to convey the melt. When the gears rotate in the specified direction, the melt enters the space between the tooth grooves of the two gears in the feed area. As the gears begin to rotate, the melt is carried into the conveying area from both sides. When the gears engage again, the melt in the tooth grooves is squeezed out into the discharge area and pressure-fed into the outlet piping.

Structural Composition: The melt pump typically consists of key components such as the pump body, variable frequency motor, reducer, coupling, bracket, and pressure sensor. The pump head is the core component, consisting of the pump casing, front and rear side covers, gears, sliding bearings, and shaft seals.

Material and Sealing: The pump body is usually made of high-strength, corrosion-resistant tool steel. The gears are made of wear-resistant, corrosion-resistant 440B material. The shaft sleeve adopts a high-temperature alloy steel with nickel impregnation for enhanced high-temperature and wear resistance. The sealing method often uses a spiral + chilled water ring design to effectively prevent melt leakage.

II. Advantages

High Efficiency and Stability: The melt pump achieves precise control of melt flow rate by accurately controlling the rotational speed, ensuring stability and consistency in the silicone seal strip extrusion process. Additionally, the optimized gear design reduces internal friction, extending the pump's service life.

Stable Pressure: The melt pump effectively buffers and compensates for fluctuations in melt pressure output by the extruder, ensuring that the melt enters subsequent processes in a stable state, thereby guaranteeing the quality stability and consistency of silicone seal strips.

Adaptation to High-Viscosity Materials: The melt pump can generate sufficient pressure to convey high-viscosity silicone melts, making it suitable for extrusion needs of different silicone materials.

Precise Temperature Control: The built-in cooling channels enable more accurate and rapid temperature control, helping to maintain a stable melt temperature and meet the processing requirements of different silicone materials.

Energy-Saving and Efficient: The melt pump can operate at lower screw speeds, reducing the energy consumption of the extruder and improving the efficiency of the entire production process.

In summary, with its characteristics and advantages such as high efficiency and stability, stable pressure, adaptation to high-viscosity materials, precise temperature control, and energy-saving efficiency, the silicone seal strip extrusion melt pump plays an important role in the field of silicone extrusion molding.

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