Product details of the wet spinneret
Product Overview
The design of wet spinneret turns out to be effective and influencing. The quality of the product has already been recognized by many international certifications. Trustech's wet spinneret is widely used in the industry and is widely recognized by customers. We have found that this product has a tendency to be more applicable.
Product Description
The quality of Trustech's wet spinneret is better than the quality of its peer products. It is shown in the following aspects.
Main structure and mechanism
symmetric layout and optimized thermal paths reduce the impact of thermal
drift and assembly stress on uniformity.
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
The spinneret design covers a wide dope viscosity range, offers strong versatility, high spinning stability, and effectively reduces issues such as filament breaks.
No positioning pins needed, making assembly and disassembly as simple as using a screw.
Longer operational lifespan.
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 design | Connections | Standard |
| Viscosity application | 1000-300000cp | Roughness | Ra0.2-0.8 |
| Solvent | DMAC, DMF, NMP | Temperature | 150℃ |
Common Specifications
|
No. |
General Specification |
Application |
Design Type |
Type |
|
1 |
0.35/0.19/0.13 |
NIPS |
FCT design |
Single-aperture/ Multi-aperture |
|
2 |
0.40/0.19/0.13 |
NIPS |
FCT design |
Single-aperture/ Multi-aperture |
|
3 |
0.5/0.28/0.15 |
NIPS |
FCT design |
Single-aperture/ Multi-aperture |
|
4 |
0.6/0.4/0.2 |
NIPS |
FCT design |
Single-aperture/ Multi-aperture |
|
5 |
0.8/0.4/0.2 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
6 |
1.3/0.7/0.4 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
7 |
1.4/0.8/0.6 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
8 |
1.5/0.9/0.6 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
9 |
1.6/1.0/0.6 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
10 |
1.8/1.1/0.5 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
11 |
1.9/1.2/0.6 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
12 |
2.0/1.0/0.7 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
13 |
3.1/1.8/1.5 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
14 |
3.1/1.8/1.5 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
15 |
3.2/2.2/1.8 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
16 |
3.3/1.1/0.9 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
|
17 |
3.4/2.4/2.0 |
NIPS |
Conventional design/ FCT design |
Single-aperture/ Multi-aperture |
Suitable Materials
PVDF (Polyvinylidene Fluoride), CA (cellulose acetate), PVC (Polyvinyl chloride), PES (Polyethersulfone), PSF/PSU (Polysulfone), PA (Nylon, Polyamide), PAN (polyacrylonitrile)
FCT Design FCT
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.
Customer Membrane Examples
FAQ
Company Advantages
Located in Shanghai Trustech Technology Development Co., Ltd. is an integrated company in the industry. The business range includes production, processing and sales. And the products include Spinning Machine,Hollow Fiber Spinneret,Gear Metering Pump. We have a full customer service system and an experienced professional service team. Strictly adhering to the principle of 'customer first', team members are committed to building a bridge between the company and customers. Look forward to working with you to create a better future.
About Trustech