Working Principle
Polymers (e.g., PET, PA, PP) are heated in an extruder to a molten, viscous state.
The melt is precisely metered and fed into the spinneret assembly. Internal distribution channels are designed to deliver the melt uniformly and steadily to each capillary.
Under high pressure, the melt is forced through extremely small capillaries typically 0.28–1.5 mm in diameter. This imposes strong shear, orienting polymer chains to some extent along the flow direction.
Upon exiting the capillary, elastic recovery causes the filament diameter to expand slightly.
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
Product Parameters
|
Brand |
Trustech |
Application |
TIPS/Melting |
| Material | SUS304, SUS630, SUS316L | Holes/Pack | Single |
| 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/ FCT design | Connections | Standard |
| Viscosity application | 1000-300000cp | Roughness | Ra0.2-0.8 |
| Solvent | No | Temperature | 260℃ |
Suitable Materials
PET(Polyethylene Terephthalate), PP (Polypropylene), PA6( Polyamide 6 ), PE (Polyethylene), PLA (Polylactide),TPU (Thermoplastic Polyurethane), PPS (Polyphenylene Sulfide), PTT (Polytrimethylene Terephthalate), PBT (Polybutylene Terephthalate), PVA (Polyvinyl Alcohol ), PAN (Polyacrylonitrile ), PEEK (Polyether Ether Ketone), PVDF-HFP( Poly vinylidene fluoride-co-hexafluoropropylene)
Common Specifications
| No. | General Specification | Application | Design Type | Type |
| 1 | 1.4/0.8/0.6 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 2 | 1.5/0.9/0.6 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 3 | 1.6/1.0/0.6 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 4 | 1.8/1.1/0.5 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 5 | 1.9/1.2/0.6 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 6 | 2.0/1.0/0.7 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 7 | 3.1/1.8/1.5 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 8 | 3.1/1.8/1.5 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 9 | 3.2/2.2/1.8 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 10 | 3.3/1.1/0.9 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
| 11 | 3.4/2.4/2.0 | TIPS/Melting | Conventional design/ FCT design | Single-aperture/ Multi-aperture |
Customer Membrane Examples
FAQ
Company Advantages
· The production of Trustech spinneret for fiber spinning complies with the requirements of ISO quality certification.
· Tests and analyzed data show that the performance of this product can meet the needs of customers.
· We will provide professional suggestions for client's reference, and help client find their ideal spinneret for fiber spinning.
Company Features
· Shanghai Trustech Technology Development Co., Ltd. is a Chinese manufacturer with years of experience. We are privileged to provide high quality spinneret for fiber spinning.
· The factory has a large number of advanced and professional testing instruments. Hence, we require all of the incoming materials, components, and products to go through inspection and testing under the equipment to guarantee high quality.
· We care for the environment. We use environmentally friendly technologies in our production activities to minimize the possible adverse effects on the environment.
Application of the Product
The spinneret for fiber spinning developed by Trustech is widely used in various fields.
Based on customers' specific situations and needs, Trustech provides comprehensive and reasonable solutions.
About Trustech