Braided Tube Reinforced Hollow Fiber Membrane Spinning Machine 8 Holes
Braided tube reinforced hollow fiber membrane spinning is an advanced variant of non-solvent induced phase separation (NIPS) designed to produce hollow fibers with an integrated braided tubular skeleton. In this process, a polymer dope is co-extruded around a continuous braided sleeve through a specialized spinneret and introduced into a non-solvent coagulation bath. Solvent/non-solvent exchange drives rapid phase separation and solidification of the polymer matrix, while the braided tube becomes embedded as a mechanical reinforcement within the nascent fiber wall. The result is a hollow fiber with an asymmetric porous morphology and significantly enhanced tensile, burst, and kink resistance—ideal for high-pressure water treatment modules, robust gas separation cartridges, biomedical devices, and dynamic filtration environments.
A braided-reinforced hollow fiber spinning line typically comprises five coordinated sections: dope preparation, metering and co-extrusion, braid handling and synchronization, coagulation and structural fixing, and post-treatment and take-up. Compared with conventional NIPS lines, the braided pathway adds two critical engineering challenges—precise tension control and concentric alignment—to ensure uniform coating thickness, consistent porosity, and strong interfacial bonding between the polymer sheath and the braid.
Leveraging over 12 years of engineering and R&D, modern systems integrate closed-loop thermal management for dope rheology, high-precision gear or servo metering pumps for stable mass flow, Trustech has upgraded the SteadyiCore Ultra 2.0 Heating System, TitanMix Pro 4.0 Mixing System, PrimeGlider Pro 3.0 Automatic Pay-off, SmartCoil Elite 3.0 Automatic Winding, and StoutDrive 2.0 motor drive setup.These technologies improve temperature precision, mixing uniformity, and braid tracking, while reducing operator intervention. In practice, they enhance line stability and reliability, cut setup and changeover time, and lower downtime, yielding measurable gains in throughput and fiber quality (e.g., tighter OD/ID tolerance, improved burst pressure, and reduced defect rates) compared with non-reinforced or legacy setups.
By uniting the proven morphology control of NIPS with an in-line braided scaffold, the braided tube reinforced hollow fiber membrane spinning machine delivers membranes that combine high permeability with superior mechanical integrity—expanding the operating envelope for compact, durable, and pressure-tolerant membrane modules.
Core sections of a NIPS production line NIPS
Control parameters: dissolution temperature, stirring speed, deaeration time, and vacuum level. Ensure a homogeneous, bubble-free dope to avoid internal fiber defects.
Control parameters: metering pump flow accuracy, spinneret orifice size and temperature, bore fluid flow rate and pressure. The spinneret orifice directly affects fiber diameter; bore fluid flow must be matched to the dope to prevent fiber collapse.
Control parameters: coagulation bath temperature, composition, and liquid level; washing temperature and time to avoid fiber shrinkage. Washing must thoroughly remove residual solvent to prevent membrane performance degradation.
Control parameters: draw ratio, drying temperature and time, winding tension. The draw ratio should be controlled at 1.5–3× to enhance mechanical properties;drying temperature should be tailored to the material to avoid embrittlement from overdrying.
Key control parameters
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Core Sections |
Parameters |
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Dope Preparation System |
|
|
Temperature |
60°C（constant stirring for 8 hours） |
|
Material Ratios |
PVDF 17.5%： NMP 67.5%： PEG 13.5%; |
|
Degrassing Time |
Stand for 10 hours (to ensure no bubble defects) |
|
Metering And Extrusion System |
|
|
Metering Pump Accuracy |
±0.5% |
|
Nitrogen Pressure |
0.35 MPa |
|
Spinneret Orifice Diameter |
2.8/2.2/1.9 mm |
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Spinning Speed |
18 m/min |
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Coagulation And Forming System |
|
|
Air Gap Length |
11cm |
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Coagulation Bath Temperature |
26°C |
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Coagulant Composition |
Water |
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Dual-diffusion Time |
Controlled by adjusting speed |
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Post-treatment and Take-up System |
|
|
Washing Requirement |
Residual Solvent < 0.1% |
|
Drying Method |
Hot Air at 62 °C |
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Draw Ratio |
1.2× (increases tensile strength to >0.4 MPa) |
|
Winding Speed |
18 m/min |
Suitable Materials
Customer Membrane Examples
Brief Introduction
Trustech is a leading company that specializes in the research, development, and manufacturing of hollow fiber membrane spinning machines and spinning spinnerets. These spinning machines and spinning spinnerets have extensive applications across various industries including water purification, gas separation, hemodialysis, ECMO (Extracorporeal Membrane Oxygenation), food and beverage processing, biotechnology, and chemical engineering, among others.
Trustech is not only at the forefront of hollow fiber membrane spinnerets which develop FCT 5th － 8th generation technology, but also leading hollow fiber membrane spinning machine and flat sheet membrane casting system. Backed by outstanding R&D and quality, Trustech holds China’s high-end market, upgraded spinning systems to enhance precision and stability, and engineered key subsystems including the SteadyiCore Ultra 2.0 Heating system,TitanMix Pro 4.0 Mixing system, PrimeGlider Pro 3.0 Automatic pay-off, SmartCoil Elite 3.0 Automatic winding and StoutDrive 2.0 motor drive setup. These advances of spinning machine and spinneret improved spinning system stability, reduced commissioning and production downtime, and increased overall spinning efficiency by 11.4% compared with before the improvements.
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