TRUSTECH Wins Invention Patent for Modular Multi-Orifice Hollow Fiber Membrane Spinneret Plate

China TRUSTECH announced that its  "Multi Orifice Hollow Fiber Membrane Spinning Device " has been granted an invention patent, introducing a modular architecture and fluid dynamics optimization that markedly improves production efficiency and product uniformity for hollow fiber membranes. As a China leading membrane spinning machine and hollow fiber membrane spinneret manufacture, the company continues to translate precision engineering into scalable industrial performance across water treatment, healthcare, and chemical applications.

Modular independent spinneret head system

The device features a three layer stack—feed plate, core liquid guide plate, and spinneret plate—with the spinneret plate integrating multiple detachable, independent spinneret heads.

Each head comprises a spinneret body, an auxiliary functional ring, and a core liquid guide tube; threaded connections enable rapid on line replacement.

Compared with monolithic plates, a single damaged head can be swapped without halting the line, lifting maintenance efficiency by about 80%.

Dual fluid equalization for uniform distribution

Core liquid equalization: A stepped core liquid chamber in the guide plate is dimensioned by mathematical modeling, setting cross sectional area ratios (Sa1:Sa2 = n:(n−2K)) and paired with a core liquid equalizing ring to balance pressure. In a 200 orifice array, core flow deviation is ≤3%.

Shell liquid equalization: The shell liquid chamber applies the same principle; equalizing ring heights are distributed by h1:h2 = n:(n−2K), ensuring even feed to each forming orifice.

Precision fluid channel design in each head

A coaxial core liquid tube (Ø 0.5–1.2 mm) and forming orifice (Ø 1.5–3.0 mm) are surrounded by an annular shell liquid chamber to form a stable  "core inner/shell outer " encapsulation at the tip.

The auxiliary ring integrates a temperature sensor for real time monitoring with ±0.5 °C stability.

Structural optimization highlights

The core liquid guide tube is monolithically formed with the spinneret body (coaxiality ≤ 0.01 mm).

Shell liquid inlet holes adopt a helical, evenly spaced pattern (6–8 per head).

A dual stage O ring sealing structure withstands 0.8 MPa.

Measured performance advantages

Wall thickness uniformity: filament CV reduced from 15% to below 5%.

Scalable production: a single spinneret module expands up to 500 orifices.

Energy efficiency: flow resistance reduced by 40%.

Company technology leadership

TRUSTECH is a high-tech enterprise specializing in the R&D, manufacturing, and sales of hollow fiber membrane spinneret heads and spinneret plates. The company pioneered FCT spinneret plate technology and advanced from the 5th to the 8th generation, introducing pin less construction, independent spinner cores, and online, non stop rapid core replacement—achieving 0.002 mm machining precision at a domestically leading level. To date, it has secured 41 independent IP rights, led the drafting of the group standard  "Hollow Fiber Membrane Spinneret Plate, " and shipped more than 3,200 batches to 634 customers across 39 countries, with leading domestic market share. Its technologies have twice been identified by the Chinese Academy of Sciences' novelty search center as  "domestically leading, " and the firm has been recognized as a National High-Tech Enterprise and a Technology Based SME.

Digital enablement for practitioners

In 2026, TRUSTECH launched MEMTOOLS, an online utility that supports capacity estimation, spinneret plate selection for R&D, and process tuning—practical capabilities that help membrane professionals raise efficiency from pilot to plant.

About the patent

This invention from TRUSTECH reconstructs the spinneret's modular mechanics and fluid distribution, delivering simultaneous gains in product quality and throughput and providing a robust, replicable path to large scale industrialization of high precision hollow fiber membranes.

Data source: Industry patent database