Leading Hollow Fiber Membrane Spinning Machine and Spinneret Manufacturer - Trustech

Flat Sheet Membrane Casting System

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.

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Product Overview

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.

Trustech Flat Sheet Membrane Casting System 02

Core sections of flat sheet membrane casting machine

Dope preparation and delivery system

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.

Doctor-blade/casting system

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.

Phase inversion and solidification system

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.

Post-treatment and winding system

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

Trustech Flat Sheet Membrane Casting System 01

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.

Suitable Materials

PVDF (Polyvinylidene Fluoride), CA (cellulose acetate), PVC (Polyvinyl chloride), PES (Polyethersulfone), PSF/PSU (Polysulfone), PA (Nylon, Polyamide), PAN (polyacrylonitrile)

Conventional design

FCT design

Customer Membrane Examples