Leading Hollow Fiber Membrane Spinning Machine and Spinneret Manufacturer - Trustech

Hollow Fiber spinning Spinneret,TIPS spinning 1

Hollow Fiber spinning Spinneret,TIPS spinning 2

Hollow Fiber spinning Spinneret,TIPS spinning

A TIPS (Thermally Induced Phase Separation) membrane spinneret is the core component used for preparing polymer microporous membranes via the thermally induced phase separation method. Trusstech TIPS spinning spinneret is a hollow fiber spinning head specifically designed for the "high-temperature melt–cooling-induced porosity" route, used to produce microporous membranes from crystalline polymers such as PVDF, PP, and PE. Its structure and functions must simultaneously satisfy around-200°C melt sealing, rapid cooling induced pore formation, and controllable porosity. Its working principle relies on temperature changes to induce phase separation in a polymer solution, ultimately forming a membrane material with a microporous structure.

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Structural Features

Hollow Fiber spinning Spinneret,TIPS spinning 3 Solution preparation: Above the polymer's melting point, dissolve the polymer in a high boiling, low volatility solvent as a diluent state to form a homogeneous solution. For example, polypropylene (PP) must be dissolved at temperatures above its melting point (about 165°C).

Hollow Fiber spinning Spinneret,TIPS spinning 4 Phase separation process: After extrusion through the spinning spinneret, cooling triggers phase separation:

Solid–liquid phase separation (S–L): the polymer crystallizes out to form the continuous phase, with the solvent as the dispersed phase.

Liquid–liquid phase separation (L–L): the polymer and solvent form a biphasic structure; the polymer rich phase constitutes the membrane matrix, while the polymer lean phase forms the pores.

Hollow Fiber spinning Spinneret,TIPS spinning 5 Solvent extraction: Use a volatile agent (e.g., ethanol) to extract the diluent, yielding a polymer membrane with a microporous structure.

Trustech hollow spinneret single hole FCT 5th Gene (4)

Trustech hollow fiber spinneret single hole 02

Functional features

The module design of flow rate control of FCT generation 6th hollow fiber spinneret is simple in structure and easy to operate, each spinneret hole can be individually controlled.

Hollow Fiber spinning Spinneret,TIPS spinning 8

Controllability of pore structure

Pore size and distribution: By adjusting parameters such as diluent type and cooling rate, the pore size 0.01–10 μm and porosity 30%–90% can be precisely tuned. For example, lowering the phase separation temperature or prolonging the phase separation time can broaden the pore size distribution. Diverse micro-morphologies: can form open or closed cell structures, isotropic or anisotropic, and asymmetric architectures to meet different application needs (e.g., filtration, separation).

Hollow Fiber spinning Spinneret,TIPS spinning 9

Broad material adaptability

Applicable polymers: suitable for crystalline polymers such as polypropylene PP, polyethylene PE and strongly hydrogen bonded polymers such as polyvinylidene fluoride PVDF that lack common room temperature solvents but can be formed into membranes via TIPS. Industrial applications: industrial scale production has been realized for materials such as PP, PE, polysulfone (PSf), and PVDF.

Hollow Fiber spinning Spinneret,TIPS spinning 10

Process advantages

Efficient membrane formation: rapid phase separation via heat exchange avoids the low porosity issues caused by solvent and nonsolvent exchange in NIPS. Strong operability and control: fewer influencing factors than NIPS, making it easier to control membrane structure and performance. Excellent mechanical properties: high fiber strength, with tensile strength up to 6.21 MPa which 2–4 times that of conventional processes, though flexibility is relatively poor, and long term use may lead to bending and swelling.

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.

Trustech hollow spinneret single hole FCT 5th Gene (5)

The Advantages of Trustech TIPS Spinneret

Hollow Fiber spinning Spinneret,TIPS spinning 12 Highly controllable pore structure: By adjusting parameters such as diluent type and cooling rate, pore size (0.01–10 μm) and porosity (30% - 90%) can be precisely tuned, enabling diverse microstructures including open/closed cells, isotropic/anisotropic, and asymmetric architectures.

Hollow Fiber spinning Spinneret,TIPS spinning 13 Compatible with hard-to-dissolve crystalline polymers: Designed for high melting point crystalline polymers without good room-temperature solvents, such as PVDF, PP, and PE. Utilizes a high-temperature melt-to-cooling phase separation pathway to achieve stable microporous membrane formation and industrial scale production.

Hollow Fiber spinning Spinneret,TIPS spinning 14 High forming efficiency and superior mechanical properties: Compared with NIPS, the TIPS phase separation process is easier to control and enables faster membrane formation; the resulting fiber tensile strength is 2 - 4 times that of conventional processes (up to 6.21 MPa), suitable for manufacturing high strength UF and MF membranes.

Product Parameters

Brand	Trustech	Application	TIPS/Melting
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	Conventional design/ FCT design	Connections	Standard
Viscosity application	1000-300000cp	Roughness	Ra0.2-0.8
Solvent	DMAC, DMF, NMP	Temperature	260℃

Suitable Materials

PET(Polyethylene Terephthalate), PP (Polypropylene), PA6( Polyamide 6 ), PE (Polyethylene), PVDF( Polyvinylidene Fluoride), PS( Polystyrene), PI ( Polyimide),PA ( Polyamide, Nylon), PMP (Polymethylpentene), PBT ( Polybutylene Terephthalate), PTFE( Polytetrafluoroethylene)

Conventional design

FCT design

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