Product details of the hollow fiber membrane spinneret
Quick Overview
Trustech hollow fiber membrane spinneret is designed with a compact size and beautiful appearance. It's easy to operate for our hollow fiber membrane spinneret. The hollow fiber membrane spinneret produced by Trustech is of high quality. And it is one of the products widely used in the industry. Shanghai Trustech Technology Development Co., Ltd. can provide one-stop purchase and solution service for our customers.
Product Information
The following is the section for presenting hollow fiber membrane spinneret's details.
Structural Features
Coaxial dual-channel design: The outer channel delivers the polymer solution (e.g., PES, PAN), while the inner channel injects the bore fluid (e.g., pure water, solvent, or gas), forming a "tube-in-tube" structure. The inner and outer diameters of the spinneret orifices determine the membrane's inner diameter, outer diameter, and wall thickness.
Working Principle
In dry-wet or wet spinning, the polymer solution is extruded from the outer annular gap, while the bore fluid is injected through the central channel. They meet at the spinneret outlet. The polymer solution contacts the external coagulation bath and the internal bore fluid, undergoes phase separation, and solidifies to form a hollow fiber membrane with a skin layer and finger-like or sponge-like pore structure.
Trustech Spinneret Key Design Elements Trustech
These parameters are fundamental to spinneret design and directly determine the membrane's final performance:
|
Parameter |
Description |
Influence on membrane performance |
|
Flow channel (R) |
The runner for transporting, buffering, and distributing the dope and bore fluids. |
Different structures should be optimized according to material properties, viscosity, spinneret orifice size, and hole quantities to achieve optimal spinning performance. |
|
Annular gap width (d) |
The gap (thickness) of the dope flow channel. |
It primarily determines the hollow fiber wall thickness. Narrower gaps yield thinner walls and lower mass-transfer resistance, but may reduce mechanical strength. |
|
Bore tube outer diameter (d₁) |
The outer diameter of the central tube forming the inner wall of the annular gap. |
Together with the outer sleeve inner diameter, it defines the annular gap width. |
|
Outer sleeve inner diameter (d₂) |
The inner diameter of the spinneret outer sleeve forming the outer wall of the annular gap. |
Together with the bore tube outer diameter, it defines the annular gap width and the fiber outer diameter. |
|
Central tube inner diameter (d₃) |
The diameter of the bore fluid channel. |
It primarily determines the fiber inner diameter. The inner diameter affects membrane module packing density and the pressure drop of fluid inside the fiber. |
|
Length-to-gap ratio (L/d) |
The ratio of the flow channel length (L) to the annular gap width (d). |
It affects spinning stability. Designing an appropriate L/d according to material properties and process conditions helps stabilize flow and eliminate entry effects, resulting in more uniform extruded fibers membrane. |
|
Concentricity |
The coaxial alignment among the dope layer inner diameter at the spinneret outlet and the bore tube inner and outer diameters. |
It affects wall-thickness uniformity and bubble point pressure. |
|
Extrusion face geometry |
The foremost geometry of the spinneret, such as flat or micro-tapered. |
It influences draw-down and deformation after extrusion, especially important for the air-gap segment in dry-wet spinning. |
The Advantages of Trustech FCT Spinneret Trustech
The spinneret design covers a wide dope viscosity range, offers strong versatility, high spinning stability, and effectively reduces issues such as filament breaks.
Product Parameters
|
Brand |
Trustech |
Application |
NIPS |
|
Material |
SUS304, SUS630, SUS316L |
Holes/Pack |
1-32 |
|
Dope inlet Thread |
G1/8, BSP1/8, NPT1/8 |
Minimum membrane OD |
0.20mm |
|
Bore liquid inlet thread |
G1/8, BSP1/8, NPT1/8 |
Customize thread |
Yes |
|
Precision |
±0.002mm |
Concentricity |
0.003mm |
|
Design |
FCT, conventional |
Connections |
Standard |
|
Viscosity application |
1000-300000cp |
Roughness |
Ra0.2-0.8 |
Suitable Materials
PVDF (Polyvinylidene Fluoride), CA (cellulose acetate), PVC (Polyvinyl chloride), PES (Polyethersulfone), PSF/PSU (Polysulfone), PA (Nylon, Polyamide), PAN (polyacrylonitrile)
FCT Design
We can offer FCT designs that allow the spinneret core to be removed, replacing conventional designs where each spinneret hole cannot be independently replaced or disassembled. If one hole has a quality issue, the entire spinneret traditionally needs repair or scrapping. Our FCT spinnerets are independently designed so each hole can be individually replaced if needed. The FCT 6th-generation spinneret enables independent on/off control of the dope feed for each spinneret core, and the 8th-generation FCT spinneret cores can be changed online within a few minute down to 50 seconds when problems occur, to ensure continuous production without downtime.
Common Specifications
|
General Specification |
Application |
Design Type |
Type |
|
0.36/0.28/0.15 |
NIPS |
Independent design |
Single-aperture/ Multi-aperture |
|
0.5/0.28/0.15 |
NIPS |
Independent design |
Single-aperture/ Multi-aperture |
|
0.6/0.4/0.2 |
NIPS |
Independent design |
Single-aperture/ Multi-aperture |
|
0.8/0.4/0.2 |
NIPS |
Conventional design |
Single-aperture/ Multi-aperture |
|
1.3/0.7/0.4 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
|
1.4/0.9/0.6 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
|
1.5/0.9/0.6 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
|
1.6/0.7/0.4 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
|
1.8/0.9/0.5 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
|
1.8/1.2/0.6 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
|
2.0/1.0/0.7 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
|
3.1/1.8/1.5 |
NIPS |
Conventional design/ Independent design |
Single-aperture/ Multi-aperture |
Customer Membrane Examples
FAQ
Company Information
Shanghai Trustech Technology Development Co., Ltd. is a modern company in With the main focus on Spinning Machine,Hollow Fiber Spinneret,Gear Metering Pump, our business range includes scientific research, production, marketing and service. Guided by the market, Trustech constantly carries out industrial upgrading. We run the sincerity-based business with a focus on mutual benefits. Our goal is to achieve international development based on the local market. Our commitment is to provide consumers with quality products and professional services. Our company focuses on morality and tries our best to fulfill people's potential. Therefore, we recruit talents from all over the country and bring together a group of elite talents. And they have rich experience in R&D, production, sales and service. With the concept of 'customers first, services first', Trustech always focuses on customers. And we try our best to meet their needs, so as to provide the best solutions.
We are waiting for consulting from new and old customers!
About Trustech