plastic filament drawing metering pump

The plastic filament drawing melt metering pump plays a crucial role in the production of plastic filament drawing. Below is an introduction regarding its functions and key points for selection:

Functions

Precise flow rate control: During the filament drawing process, the melt needs to pass through the spinneret at a stable and accurate flow rate to ensure that the formed filaments have a uniform diameter. The plastic filament drawing metering pump can control the melt flow rate with high precision. By precisely adjusting its output flow rate, it can meet the production requirements of filaments with different specifications. For example, when producing high-end fibers with a fine diameter, it can control the flow rate within an extremely small error range to guarantee the consistency of the filament diameter.

Stable melt pressure: It provides a stable pressure for the melt, enabling the melt to flow at a uniform speed throughout the entire filament drawing system. A stable pressure helps prevent problems such as uneven filament thickness and breakage. During high-speed filament drawing, a stable pressure can ensure that the filaments maintain a good shape during the cooling and stretching processes.

Adaptability to process changes: When the parameters of the filament drawing process change, such as adjustments to the spinneret hole diameter and stretch ratio, the metering pump can respond quickly and adjust the pressure and flow rate to maintain the stability of the filament drawing process, allowing the filament drawing machine to adapt to different production requirements and product specifications.

Product quality assurance: Accurate flow rate control and stable pressure result in more uniform filament diameters and smoother surfaces, which are crucial for producing high-quality fiber products. For example, for synthetic fibers used in high-end textiles, their uniformity directly affects the feel, strength, and appearance of the textiles. Meanwhile, stable operation can reduce the probability of filament defects such as bubbles and broken filaments, minimizing product defects caused by unstable flow and improving the product yield.

Key Points for Selection

Flow rate requirement: The flow rate directly affects the processing efficiency. The upper - limit flow rate required for operation should be used as the standard to take into account the normal flow rate. Usually, the normal flow rate requirement is multiplied by 1.1 to avoid over - flow and overload.

Pressure requirement: The rated pressure of the selected metering pump should be slightly higher than the actual pressure required, generally 10 - 20% higher. Excessively high pressure will waste energy and increase the equipment investment and operating costs.

Pump head material: Select the material for the flow - passing parts based on the properties of the flowing medium. Improper selection may cause corrosion damage to the flow - passing components by the medium or medium leakage to contaminate the system, and in severe cases, may even lead to major accidents.

Precision requirement: A higher precision level involves greater investment. It is necessary to choose an appropriate precision level according to the requirements for filament quality and dimensional accuracy in production.

Operating temperature: Different metering pump models have different temperature tolerances due to differences in their manufacturing materials. The corresponding pump model should be selected based on the specific temperature changes. If there are special needs, a customized pump model can be provided.

Medium properties: Consider the name, composition, viscosity, and the presence of particles or fibrous impurities of the medium to be transported. For example, for the melt in the plastic filament drawing process, its viscosity and other characteristics should be clarified. In some working conditions, temperature changes caused by unexpected situations also need to be considered.

Working environment: Factors such as the altitude of the operation site, ambient temperature and humidity, and the demand for the operating state (whether it is intermittent or continuous) should be taken into account.

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