Product details of the melt spinning
Product Information
melt spinning from Shanghai Trustech Technology Development Co., Ltd. is safe and harmless. The product has been tested and inspected according to the strict quality standards. Trustech has obtained the certification of melt spinning.
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 Advantage
• Our product network covers all provinces and regions of the country. It promotes us to sell products to Europe, America, Africa and Southeast Asia.
• Trustech has introduced an advanced management model and excellent management philosophy, and built a strong and professional management team.
• Our company was established in After years, we have gained a good reputation in the industry for the work experience accumulated by users in different industries.
• To improve the service quality, we have set up an excellent service team and a one-for-one service pattern between enterprises and customers. Each customer is equipped with a service specialist.
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