Flat Sheet Membrane Casting System-3
A Flat Sheet Membrane Casting System mainly consists of four core sections: dope preparation and delivery system, doctor-blade/casting system, phase inversion and solidification system, and post-treatment and winding system.. The flat sheet membrane casting equipment performance and stability determine the quality and properties of the flat sheet membrane. Leveraging 11 years of experience and R&D, Trustech has upgraded the SteadyiCore Ultra 2.0 Heating System, TitanMix Pro 4.0 Mixing System and StoutDrive 2.0 motor drive setup. These Trustech technologies precisely control temperature and heat transfer uniformity, thereby enhancing flat sheet membrane spinning machine stability and reliability, reducing setup time and production downtime, and increasing overall spinning efficiency by 4.7% compared with pre-upgrade levels.
Core sections of flat sheet membrane casting machine
The core units are the mixing tank and precision delivery pump. Strictly control polymer concentration, additives, temperature, and viscosity of the casting dope to ensure stable rheology.
This is the core film-forming section. Key equipment includes the doctor blade or extrusion die. Precisely control blade gap height, blade-to-substrate angle, and the tension of the nonwoven substrate.
Depending on the process, this is either a coagulation bath for NIPS or a cooling zone for TIPS. Strictly control coagulation bath temperature and chemical composition (for NIPS), or the cooling zone temperature gradient and air velocity (for TIPS). These parameters govern phase-separation kinetics and directly determine the membrane’s micro-pore structure, surface pore size, and porosity.
Mainly includes washing tanks and a winder. Control wash-water purity, temperature, and number of stages to thoroughly remove solvent, and precisely control winding tension and speed to prevent wrinkling or stretching, ensuring flatness and mechanical integrity of the final product.
Key control parameters
|
Core Sections |
Parameters |
|
Dope preparation and delivery system |
|
|
Polymer Concentration |
16.70 wt% (PVDF/PES in DMAC) |
|
Solvent Purity |
≥ 99% |
|
Coating Thickness |
50 μm |
|
Blade Gap Accuracy |
± 10 μm |
|
Doctor-blade/casting system |
|
|
Effective Coating Length |
800 mm |
|
Coating Thickness |
50 μm |
|
Phase inversion and solidification system |
|
|
Coagulation Bath Temperature |
27 °C |
|
Bath Length |
3 m |
|
Conveyor Speed |
5 m/min |
|
Rinse Flow (Pure Water) |
5 L/min |
|
Drying Temperature |
80 °C |
|
Humidity |
≤ 30% RH |
|
Post-treatment and winding system |
|
|
Hot-Press Temperature |
70 °C |
|
Pressure |
0.3 MPa |
|
Winding Tension |
0.5 N |
Suitable Materials
Customer Membrane Examples
Brief Introduction
Trustech is a leading company that specializes in the research, development, and manufacturing of hollow fiber membrane spinning machines and spinning spinnerets. These spinning machines and spinning spinnerets have extensive applications across various industries including water purification, gas separation, hemodialysis, ECMO (Extracorporeal Membrane Oxygenation), food and beverage processing, biotechnology, and chemical engineering, among others.
Trustech is not only at the forefront of hollow fiber membrane spinnerets which develop FCT 5th － 8th generation technology, but also leading hollow fiber membrane spinning machine and flat sheet membrane casting system. Backed by outstanding R&D and quality, Trustech holds China’s high-end market, upgraded spinning systems to enhance precision and stability, and engineered key subsystems including the SteadyiCore Ultra 2.0 Heating system,TitanMix Pro 4.0 Mixing system, PrimeGlider Pro 3.0 Automatic pay-off, SmartCoil Elite 3.0 Automatic winding and StoutDrive 2.0 motor drive setup. These advances of spinning machine and spinneret improved spinning system stability, reduced commissioning and production downtime, and increased overall spinning efficiency by 11.4% compared with before the improvements.
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