Leading Hollow Fiber Membrane Spinning Machine and Spinneret Manufacturer - Trustech

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 1

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 2

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning

The FCT 5th generation MBR spinneret plate is a high precision, high efficiency core production component developed by Trustech on its independently innovated Fast Change Technology (FCT) for manufacturing hollow fiber membranes used in MBRs (membrane bioreactors). It is a revolutionary spinning spinneret whose core design philosophy is through a split, modular architecture to delivers exceptional ease of use, high precision, and long service life. It addresses the traditional problems of hollow spinneret plates such as complex disassembly/assembly, susceptibility to damage, and high maintenance costs, establishing a technological benchmark in the field of hollow fiber membrane manufacturing.

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Core structure and working mechanism

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 3 Split design: Decoupling the spinneret core from the flow channel plate. The spinneret core carries the critical forming geometry ,outer annular dope channel and bore needle positioning, while the flow channel plate handles upstream distribution and supply. Without locating pins, rapid, repeatable assembly is achieved via threads/taper fits or equivalent positioning.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 4 Monolithic high precision spinneret core: The spinneret core is machined as a single piece, achieving geometric precision up to 0.002 mm and concentricity of 0.003 mm. This ensures a uniform annular gap, a coaxial bore needle, and a stable shear field, reducing eccentricity and dimensional scatter at the source.

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Core features of the FCT 5th generation MBR spinneret plate

Its features center on three core principles: maintenance convenience, precision design, and production scalability.

Maintenance convenience: split architecture and quick disassembly

This is the most intuitive breakthrough of FCT technology, directly tackling the time and labor intensive maintenance of traditional spinnerets.

▶ Split design with independent spinneret core and flow channel plate:

Separates the critical, most clog prone "spinneret core"from the main " flow channel plate."

▶ No locating pins; assembly like screwing a bolt:

Replaces complex locating pins common in precision molds with a much simpler mechanical fastening method. Operators need no special tools or lengthy training and can remove/install the spinneret core as easily as changing a screw.

▶ Easy cleaning without opening the flow channel plate:

For specific applications such as MBR braided-tube coating, the spinneret core can be removed directly for cleaning and maintenance without opening the entire flow channel plate. This greatly shortens cleaning time, reduces the risk of damage from improper disassembly, and minimizes production downtime.

Precision design: monolithic spinneret core and ultra high accuracy

While enhancing maintainability, it pursues extreme precision in key components.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 10

▶ Monolithic spinneret core design:

The core forming element is machined integrally, avoiding the error accumulation and potential leak paths of multi part assemblies.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 11

▶ Ultra high machining accuracy

Machining precision up to 0.002 mm (2 μm) and concentricity up to 0.003 mm (3 μm). This ensures uniform membrane wall thickness and a round, stable lumen, fundamentally improving product quality and performance consistency of hollow fiber membranes.

Production scalability: multi-hole expansion and outstanding reliability

The design strongly supports large scale industrial production.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 12

▶ Powerful multi-hole expansion:

Easily scales to 8, 12, 16, 20, 32 holes, or more. A single spinneret plate can produce dozens of fibers simultaneously, dramatically boosting per-machine throughput.

▶ High reliability and long service life:

Superior manufacturing and a design that avoids frequent forceful disassembly yield excellent mechanical stability and durability. Service life is extended by over 50% compared with previous generations, ensuring continuous and stable production.

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.
Central tube inner diameter (d₃)	The diameter of the bore fluid channel.
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.
Concentricity
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 Generation 5th 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.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 15 Modular Design with Separate Spinneret Core and Flow Channel Plate: No positioning pins needed, making assembly and disassembly as simple as using a screw.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 16 Integrated Spinneret Core: High precision and good concentricity.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 17 Robust Needle Design: The Bore liquid needle is not easily damaged.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 18 Easy Cleaning and Maintenance: User-friendly cleaning and maintenance, friendly for non-professional operators

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 19 High Reliability: Stable and consistent performance.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 20 Extended Service Life: Longer operational lifespan.

FCT Hollow Fiber Membrane Spinneret Generation 5, Braided Tube Reinforced Spinning 21 Convenient Maintenance for MBR Braided Tube Coating Spinneret: Spinneret cores can be easily taken out and cleaned without disassembling the flow channel plate.

Product Parameters

Brand	Trustech	Application	Braided tube
Material	SUS304, SUS630, SUS316L	Holes/Pack	1-8
Dope inlet Thread	G1/8, BSP1/8,NPT1/8	Minimum membrane OD	1.0mm
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℃

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.

Conventional design

FCT design

Common Specifications

No.	General Specification	Application	Design Type	Type
1	2.3/1.5/1.0	Braided tube	FCT design	Single-aperture/ Multi-aperture
2	2.3/1.5/1.2	Braided tube	FCT design	Single-aperture/ Multi-aperture
3	2.7/1.5/1.2	Braided tube	FCT design	Single-aperture/ Multi-aperture
4	2.2/1.7/1.4	Braided tube	FCT design	Single-aperture/ Multi-aperture
5	2.7/2.2/1.9	Braided tube	FCT design	Single-aperture/ Multi-aperture
6	2.8/2.0/1.5	Braided tube	FCT design	Single-aperture/ Multi-aperture
7	2.8/2.2/1.9	Braided tube	FCT design	Single-aperture/ Multi-aperture
8	2.8/2.3/2.0	Braided tube	FCT design	Single-aperture/ Multi-aperture
9	2.9/1.4/1.1	Braided tube	FCT design	Single-aperture/ Multi-aperture
10	2.9/1.8/1.5	Braided tube	FCT design	Single-aperture/ Multi-aperture
11	2.9/1.9/1.6	Braided tube	FCT design	Single-aperture/ Multi-aperture
12	3.0/2.3/1.9	Braided tube	FCT design	Single-aperture/ Multi-aperture
13	3.0/2.3/2.0	Braided tube	FCT design	Single-aperture/ Multi-aperture
14	3.1/2.8/2.5	Braided tube	FCT design	Single-aperture/ Multi-aperture
15	3.2/2.2/1.8	Braided tube	FCT design	Single-aperture/ Multi-aperture
16	3.4/1.7/1.4	Braided tube	FCT design	Single-aperture/ Multi-aperture
17	3.4/2.2/1.8	Braided tube	FCT design	Single-aperture/ Multi-aperture
18	3.7/1.9/1.6	Braided tube	FCT design	Single-aperture/ Multi-aperture
19	3.8/2.2/1.9	Braided tube	FCT design	Single-aperture/ Multi-aperture
20	3.8/2.3/2.0	Braided tube	FCT design	Single-aperture/ Multi-aperture
21	3.8/2.3/2.0	Braided tube	FCT design	Single-aperture/ Multi-aperture
22	4.0/2.5/2.1	Braided tube	FCT design	Single-aperture/ Multi-aperture
24	4.0/3.0/2.5	Braided tube	FCT design	Single-aperture/ Multi-aperture

Customer Membrane Examples