spinning metering pump

The spinning metering pump is a core piece of equipment in chemical fiber production. Its function is to accurately meter and uniformly 

deliver polymer melt or solution to the spinneret, ensuring uniform linear density and stable quality of the finished fiber. The following 

section introduces it from six aspects: working principle, types, structure, performance requirements, application scenarios, and key 

selection points:

I. Working Principle The spinning metering pump achieves quantitative fluid control through gear meshing. When the gears rotate, 

the volume of the meshing chamber changes, creating a negative pressure zone and a high pressure zone:

Negative pressure zone: Melt or solution is drawn in at one end of the inlet, filling the tooth grooves;

High pressure zone: The continuous rotation of the gears forces the fluid into the discharge chamber, and finally, through gear rotation, 

it is expelled from the pump body.

This process, through the periodic meshing of the gears, achieves continuous suction and discharge, ensuring the accuracy and stability

 of fluid delivery.

II. Types and Classifications

By Medium Type

* Melt Spinning Pump: Suitable for high-temperature melts such as polyester, nylon, and polypropylene; temperature resistance up

 to 300℃; 1-16 outlets.

* Solution Spinning Pump: Suitable for corrosive solutions such as spandex and acrylic; requires solvent resistance; up to 32 outlets.

By Structure

* Single Pump: For conventional short fiber production.

* Stacked Pump: For multi-layer spinning scenarios; one pump body is equivalent to 2-4 ordinary pumps.

* Planetary Pump: For filament spinning; achieves high-precision metering through a planetary gear structure.

* Composite Pump: For bicomponent fiber production; simultaneously transports two different fluids.

III. Structural Composition

A typical spinning metering pump consists of the following core components:

Precision Gear Set: The driving and driven gears have the same number of teeth, and their tooth profiles are involute standard gears. 

Volume change is achieved through gear meshing.

Pump Body: Includes an upper cover plate, a lower cover plate, and a middle plate (figure-eight plate), forming an internally enclosed 

cavity to contain the fluid.

Drive Shaft: Linked to an external pump shaft via a connecting shaft, driving the gear rotation.

Inlet and Outlet Channels: Aligned with the pump base channels to ensure smooth fluid flow.

Material Selection:

The melt pump uses heat-resistant alloy steel (e.g., Rockwell hardness ≥ 60 HRC) to withstand high-temperature environments

 approaching 300°C. The solution pump uses corrosion-resistant alloy steel, and key friction pairs undergo surface nitriding 

treatment to improve wear resistance.

IV. Performance Requirements

Metering Accuracy: Flow deviation must be controlled within ±0.5% to ensure uniform fiber linear density;

Stability: Under high pressure or pressure fluctuations, the supply variation should be minimal and there should be no jamming;

Temperature and Pressure Resistance: The melt spinning pump must withstand temperatures approaching 300℃ and high pressure 

environments without loss of accuracy during residue removal;

Wear and Corrosion Resistance: Gear and pump body materials must possess high hardness and corrosion resistance to extend 

service life;

Interchangeability and Sealing: Parts must be standardized for easy assembly and disassembly while ensuring reliable sealing to

 prevent leakage;

Structural Optimization: The shape should facilitate heating and insulation, adapting to different spinning process requirements.

V. Application Scenarios

Chemical Fiber Production: Spinning conventional fibers such as polyester, polypropylene, spandex, and nylon, using precise 

metering to control fiber properties;

Nonwoven Fabrics: Such as nonwoven fabric production, using stacked pumps or planetary pumps to achieve multi-layer or

 filament spinning;

Specialty Fibers: Production of high-performance fibers such as carbon fiber and acetate fiber, requiring higher precision and 

corrosion resistance from metering pumps;

Low-Viscosity Material Transportation: Some spinning metering pumps (such as MarFin oil pumps) can be extended to 

metering low-viscosity fluids such as water, organic solvents, and perfumes.

VI. Selection Guidelines

Raw Material Characteristics: Select pump body material and gear structure based on melting point, melt index, corrosivity, 

and flowability.

Production Requirements: Single pumps are used for staple fiber production; stacked pumps or planetary pumps are needed 

for filament or multi-layer spinning.

Industry Compatibility: Different fields such as non-woven fabrics, polyester staple fiber, and polypropylene filament have 

specific requirements for pump structure.

Precision and Stability: Prioritize high-precision gear sets and modular designs to ensure flow uniformity.

Temperature and Pressure Resistance: Select heat-resistant alloy steel or corrosion-resistant materials based on process 

temperature and pressure.

Maintenance Convenience: Parts interchangeability, sealing design, and overall structure must facilitate disassembly, 

assembly, and insulation.

If you have specific selection and pricing requirements for precision spinning pumps or metering pumps, please contact CIXIFM Winny:

Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995