Product details of the hollow fiber spinneret
Product Information
All materials of Trustech hollow fiber spinneret meet global standards. The product meets the set industry standards in all respects, including durability, performance, function, etc. Shanghai Trustech Technology Development Co., Ltd. has years of R&D and production experience for hollow fiber spinneret.
Structural features
The center needle delivers the bore fluid (or N₂), while the outer annular slit extrudes the high viscosity spinning dope to form the hollow lumen.
L/D ≈ 1–2 with a cone angle of 60–90°, suppressing spinneret orifice swell and mitigating abrupt velocity gradients.
Equipped with 60–120°C circulating oil or cartridge heaters to ensure that high viscosity solutions >1000 Pa·s exhibit low viscosity and uniform flow at the orifice.
Continuously adjustable 3–50 mm between the spinneret face and the coagulation bath surface, enabling optimization of the draw ratio,up to 20times.
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 Dry Jet Wet Spinning Spinneret Trustech
Product Parameters
|
Brand |
Trustech |
Application |
Dry-jet wet spinning |
| 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 | Conventional design | Connections | Standard |
| Viscosity application | 1000-300000cp | Roughness | Ra0.2-0.8 |
| Solvent | DMAC, DMF, NMP | Temperature | 150℃ |
Suitable Materials
PVDF (Polyvinylidene Fluoride), CA (cellulose acetate), PVC (Polyvinyl chloride), PES (Polyethersulfone), PSF/PSU (Polysulfone), PA (Nylon, Polyamide), PAN (polyacrylonitrile)
Process characteristics
High positive drawing at the spinneret: low resistance in the air gap allows spinning speeds of 600 - 1200 m min⁻¹, which is 3–5 times that of pure wet spinning.
Uniform fiber structure: pre-solidification in the air gap forms a dense skin; bidirectional diffusion in the coagulation bath is moderated, reducing skin - core differences and overall porosity.
Suitable for high solids, high viscosity dopes: stable extrusion even at 18 - 30% solids and zero-shear viscosities of 2000–3000 Pa·s.
Flexible hole count: Spinning spinneret extend 1–6 holes for lab use, and 4-32 holes for industrial plates.
Common Specifications
| No. | General Specification | Application | Design Type | Type |
| 1 | 1.3/0.7/0.4 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 2 | 1.3/0.8/0.5 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 3 | 1.3/1.0/0.7 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 4 | 1.4/0.7/0.4 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 5 | 1.4/0.9/0.6 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 6 | 1.4/1.0/0.8 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 7 | 1.6/0.8/0.5 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 8 | 1.6/0.9/0.6 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 9 | 1.8/0.9/0.5 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 10 | 1.8/1.2/0.6 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 11 | 1.8/1.2/0.8 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 12 | 2.3/1.5/1.0 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 13 | 2.3/1.5/1.2 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 14 | 2.7/1.5/1.2 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 15 | 2.2/1.7/1.4 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 16 | 2.7/2.2/1.9 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 17 | 2.8/2.0/1.5 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 18 | 2.8/2.2/1.9 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 19 | 2.8/2.3/2.0 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 20 | 2.9/1.4/1.1 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 21 | 2.9/1.8/1.5 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 22 | 2.9/1.9/1.6 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 23 | 3.0/2.3/1.9 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 24 | 3.0/2.3/2.0 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 25 | 3.1/2.8/2.5 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 26 | 3.2/2.2/1.8 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 27 | 3.4/1.7/1.4 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 28 | 3.4/2.2/1.8 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 29 | 3.7/1.9/1.6 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 30 | 3.8/2.2/1.9 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
| 31 | 3.8/2.3/2.0 | dry-jet wet spinning | Conventional design | Single-aperture/ Multi-aperture |
Customer Membrane Examples
FAQ
Company Advantage
• Trustech has introduced an advanced management model and excellent management philosophy, and built a strong and professional management team.
• Our products are sold throughout the country and exported to Southeast Asia, Africa and other regions. They are deeply loved and sought after by local customers.
• The superior geographical location and traffic convenience lay a solid foundation for Trustech to develop sustainably in the following days.
• Trustech pays great attention to customer demand and strives to provide professional and quality services for customers. We are highly recognized by customers and are well received in the industry.
Sincerely welcome customers who have needs to contact us for negotiation. I hope we can work together to create a brilliant future.
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