Melt metering filament yarn pumps

Melt Spinning Metering Pump for Filament Yarn, commonly referred to as the Chemical Fiber Spinning Metering Pump, plays a crucial role in chemical fiber production. Below is a detailed introduction to this type of pump:

I. Definition and Applications

The Chemical Fiber Spinning Metering Pump (also known as the Melt Spinning Metering Pump for Filament Yarn) is a key component on spinning machines. It is primarily used to uniformly and equivalently convey spinning melt to the spinning components, where it is cooled and solidified into filaments through the micro-holes of the spinneret. It is mainly applied in the spinning of polyester, polypropylene, nylon filaments and staple fibers, as well as in the spinning of POY and FDY filaments.

II. Structure and Working Principle

Structure: The Chemical Fiber Spinning Metering Pump is composed of parts such as plates, gears, shafts, driving sleeves, fixing sleeves, cover plates, etc. The pump body is mostly made of high-temperature tool steel or alloy steel, and can also be customized according to user requirements.

Working Principle: The working principle of the melt spinning metering pump mainly relies on the rotational motion of its internal gears and the meshing between them. During the rotation of the gears, the meshing of the driving and driven gears causes a change in the working volume, thereby pushing the melt. As the gears rotate, the melt is brought into the feed area from both sides, and the re-meshing of the gears squeezes the melt in the tooth spaces, pressing it towards the outlet pipe. Since the flow rate is strictly proportional to the pump's rotational speed, as long as the pump shaft rotates, the gears press the melt towards the outlet side.

III. Performance Parameters

The main performance parameters of the Chemical Fiber Spinning Metering Pump include:

Outlet Pressure: ≤50MPa

Operating Speed: 5~40rpm

Maximum Pressure Differential: 40MPa

Operating Temperature: ≤350℃

Cleaning Temperature: ≤450℃

Flow Rate: 0.1~150CC/REV

Additionally, the pump's inlet and outlet designs are also diverse, including specifications such as one inlet and one outlet, two outlets, four outlets, six outlets, eight outlets, etc.

IV. Operation and Maintenance

Installation and Preheating: Before installing the chemical fiber metering pump, ensure that all areas that may come into contact are clean. There are two preheating methods for chemical fiber metering pumps: preheating in an oven and preheating on the production line. During the preheating process, ensure that the pump body is heated slowly and uniformly to the operating temperature to prevent overheating.

Locking and Inspection: Apply high-temperature resistant anti-seizing compound to the installation bolts on the screw threads to prevent them from becoming difficult to remove after use. Before installation and commissioning, conduct a detailed inspection of the chemical fiber metering pump to ensure that the installation screws are tightened to the required torque value, the shaft rotates smoothly and easily, and the rotation direction is correct.

Routine Maintenance: During use, regularly check the sealing, lubrication, and operating conditions of the chemical fiber metering pump. For equipment that has been shutdown for an extended period, it is recommended to replace all seals before restarting to prevent leakage.

In summary, the Melt Spinning Metering Pump for Filament Yarn (Chemical Fiber Spinning Metering Pump) plays an important role in chemical fiber production. Understanding its structure, working principle, performance parameters, and operation and maintenance methods is crucial for ensuring smooth production processes and improving product quality.

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