Leading Hollow Fiber Membrane Spinning Machine and Spinneret Manufacturer - Trustech

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 1

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 2

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function

The FCT 6th generation spinneret plate is the core forming component for hollow fiber membranes, developed by Trustech based on Fast Change Technology (FCT) and designed specifically for wet-process NIPS (non-solvent induced phase separation) spinning. Building on the advantages of the 5th generation such as independent spinneret core design, pinless structure, and high precision forming, it introduces structural innovations for multiple holes expansion and per holes independent control, enabling multi-spec configurations such as 8, 12, and 16 holes.

During spinning, the bore fluid which forms the lumen and the dope which membrane forming feed of each individual spinneret hole can be switched on/off and regulated independently, solving the industry pain point of "entire line stoppage due to a single hole failure" in traditional multiple holes spinning spinnerets. This technology is particularly suited to production environments with unstable materials and large process fluctuations, significantly boosting productivity, reducing material waste and labor costs, and advancing cost reduction, efficiency gains, and large scale manufacturing in China's membrane industry.

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Core working principle

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 3 Parallel multiple holes layout with independent supply:

Inside the hollow fiber spinneret plate, the bore fluid and dope are split into multiple parallel, independent branches. Each spinneret hole is equipped with its own valve set, microflow control and sealing module, achieving dual independent start and stop for "bore fluid + dope" on a per holes basis.

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 4 Fast Control:

When a given spinneret hole exhibits spinning quality abnormalities (e.g., filament breakage, eccentricity, clogging, or ratio fluctuations), the bore fluid and dope of that hole can be shut off immediately to isolate the faulty hole; the remaining holes continue stable spinning, keeping the line running and capacity unaffected.

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 5 Scalable multiple holes architecture:

Through modular distribution and isobaric flow channel design, FCT 6th generation hollow fiber spinneret even when scaling to 8/12/16 holes, each hole still receives stable, repeatable flow and shear conditions.

TRUSTE~2

TRUSTE~1

Core features of the FCT 6th generation spinneret plate

Multiple holes expansion capability: breaking capacity bottlenecks and enabling scale-up

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 8

▶ Flexible hole counts:

Upgraded from the 5th generation hollow fiber spinneret to a multiple holes design supporting 8, 12, and 16 holes layouts, boosting productivity several fold over early single or low holes-count equipment. Its multiple holes structure, based on a "multiple holes modular" patented design with equalization rings and symmetric distribution ports on the feed plate and bore fluid manifold, ensures consistent pressure for dope and bore fluid at each spinning spinneret hole. Membrane filament wall thickness variation can be controlled within 0.003 mm, solving the traditional multiple holes problem of "flow maldistribution causing filament quality variation."

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 9

▶ Compatible with diverse scenarios:

From pilot lines to mass production lines for tens of thousands of tons of water treatment membranes, hole count configuration can be flexibly matched to capacity needs. For example, a 12 holes specification in municipal MBR membrane production nearly doubles the daily output per spinneret plate compared with a 6 hole unit, without additional footprint or labor.

Per holes independent control: precise loss mitigation and true "non-stop production"

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 10

▶ Dual independent switching per hole:

Each spinneret hole has independent control units for bore fluid and dope, allowing the material feed to the faulty hole to be cut off individually. For a 12 holes plate, if one filament shows defects such as breakage, eccentricity, or surface roughness, simply close that hole's switches and the other 11 filaments continue spinning normally, completely avoiding the capacity interruption caused by "one holes failure, whole line downtime" in traditional equipment.

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 11

▶ Minimizing cost losses:

In scenarios with unstable materials such as PVDF and polyamide or processes such as coagulation bath concentration, spinning temperature, the per holes shutoff function reduces raw material waste from nonconforming filaments by over 30% compared to traditional equipment, and avoids wasting shift labor and time. For instance, after adoption by a environment protect membrane manufacturer, defect rates due to process fluctuations dropped 4%.

Continued and upgraded FCT advantages: precision meets easy maintenance

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 12

▶ High precision lineage continued:

Retains the 5th generation FCT spinneret advantages of 0.002 mm machining precision and a pinless structure, eliminating the need for manual concentricity adjustment and fundamentally avoiding the eccentricity issues common to traditional insert tube spinnerets. This ensures uniform wall thickness and stable separation performance such as MWCO deviation ≤ 10%.

Strong scenario adaptability: targeting process pain points to empower industrial upgrades

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 13

▶ Suited to unstable production conditions:

For scenarios such as new material R&D, process tuning, or processing of lower grade raw materials with poor stability, per holes independent control can respond in real time to sudden quality issues, reducing trial-and-error costs. For example, in developing antifouling PVDF membranes, one company shortened the R&D cycle by 40% through per holes parameter tuning.

▶ Supporting mass production across sectors:

As one of the technical underpinnings of the standard "Hollow Fiber Membrane Spinneret Plate" (T/SHDSGY058-2022), these products are widely used in environmental water treatment,MBR membranes, healthcare (hemodialysis membranes), and other fields, with over 90% market share in China's high-end segment, and accelerating the industry's transition from "experience based production" to "precision manufacturing."

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 6th Generation 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 NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 16 Extending FCT's fast change, high precision advantages to complex conditions and large scale manufacturing

Inheriting the 5th generation pinless structure with 0.002 mm machining precision, eliminating the need for concentricity adjustment. It is particularly suitable for R&D or mass production scenarios with unstable materials (e.g., PVDF, polyamide) and large process fluctuations, significantly reducing scrap rate, shortening R&D cycles, and enabling large scale precision manufacturing of high end membranes for water treatment, MBR, hemodialysis, and more.

FCT NIPS 6th generation hollow fiber spinneret 12 holes, on-off control function 17 Precise per-orifice independent control

Each spinneret orifice is equipped with independent control units for the bore fluid and casting dope, allowing material feed to a faulty orifice to be cut off individually. This prevents whole-line stoppage due to a single-orifice failure and, under unstable materials or fluctuating processes, reduces raw material waste by over 30%, lowers defect rates, and improves production continuity.

Product Parameters

Brand	Trustech	Application	NIPS
Material	SUS304, SUS630, SUS316L	Holes/Pack	8-12
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, conventional	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	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	FCT design	Single-aperture/ Multi-aperture
6	1.3/0.7/0.4	NIPS	FCT design	Single-aperture/ Multi-aperture
7	1.4/0.8/0.6	NIPS	FCT design	Single-aperture/ Multi-aperture
8	1.5/0.9/0.6	NIPS	FCT design	Single-aperture/ Multi-aperture
9	1.6/1.0/0.6	NIPS	FCT design	Single-aperture/ Multi-aperture
10	1.8/1.1/0.5	NIPS	FCT design	Single-aperture/ Multi-aperture
11	1.9/1.2/0.6	NIPS	FCT design	Single-aperture/ Multi-aperture
12	2.0/1.0/0.7	NIPS	FCT design	Single-aperture/ Multi-aperture
13	3.1/1.8/1.5	NIPS	FCT design	Single-aperture/ Multi-aperture
14	3.1/1.8/1.5	NIPS	FCT design	Single-aperture/ Multi-aperture
15	3.2/2.2/1.8	NIPS	FCT design	Single-aperture/ Multi-aperture
16	3.3/1.1/0.9	NIPS	FCT design	Single-aperture/ Multi-aperture
17	3.4/2.4/2.0	NIPS	FCT design	Single-aperture/ Multi-aperture

Customer Membrane Examples