TRUSTECH Secures Patent for Enhanced Hollow Fiber Membrane Spinneret

China TRUSTECH today announced that it has been granted a patent for an enhanced hollow-fiber membrane spinneret that solves longstanding mechanical-strength limitations in conventional hollow fibers. By introducing an integrated braided-tube channel and precision fluid-control architecture, the invention provides critical process capability for producing braided-tube–reinforced hollow-fiber membranes used in high-pressure water treatment and specialty separations. As a China leading membrane spinning machine and hollow fiber membrane spinneret manufacture, TRUSTECH continues to advance the state of the art with production-ready, modular designs.

Integrated Braided Tube Co Extrusion Architecture

The patented hollow spinneret adopts a split construction comprising a spinneret core and a nozzle cap:

The core features a braided tube guide shaft at the top (Ø 2–5 mm) and an integrated needle tube at the bottom (ID 0.8–1.5 mm), with a through core braided tube channel (coaxiality ≤ 0.02 mm).

A braided tube passes through the channel at 20–50 m/min and is co extruded with the cast dope emerging from the spinneret forming orifice, creating a reinforcement structure with the braid as an internal skeleton.

Precision Fluid Control in the Spinneret Plate

Dual annular damping grooves in the nozzle cap dope chamber limit flow rate fluctuation to within ±5%.

A reverse conical boss (30°cone) paired with a tapered transition groove (45°cone) enables laminar transition of the dope layer.

Tangential dope inlets generate a controlled swirl to improve mixing uniformity.

High Accuracy Alignment Mechanism

Core and nozzle cap are pin located with a 0.01 mm fit clearance.

The needle tube is co axially aligned with the spinneret forming orifice (deviation < 0.03 mm).

M4 stainless steel fasteners with dual stage locking improve anti vibration performance threefold.

Materials and Surface Engineering Enhancements

One piece stainless steel core, HRC 30–35.

Mirror polished needle tube surface (Ra ≤ 0.2 μm).

Hard chrome plating on critical contact faces (15–20 μm).

Performance Metrics

Membrane filament burst strength up to 2.5× that of conventional products.

Braided tube positional accuracy: ±0.05 mm.

Continuous operating life ≥ 2,000 hours.

Advancing Industrialization and Standardization

This innovation enables stable, high quality production of reinforced hollow fibers on hollow fiber spinneret plates, while the modular architecture lays a foundation for future multi orifice scale up. TRUSTECH has pioneered FCT spinneret plate technology and driven iterative upgrades 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 and recognized domestic leadership. The company has amassed 41 independent IP rights and led the drafting of the group standard "Hollow Fiber Membrane Spinneret Plate, " closing a longstanding standards gap.

Digital Tools to Accelerate Adoption

In 2026, TRUSTECH launched MEMTOOLS, an online utility for capacity estimation, spinneret plate selection during R&D, and process tuning—providing practical enablement for membrane professionals and elevating workflow efficiency from lab to plant.

Market Impact

TRUSTECH products serve water treatment, healthcare, and chemical industries, with sales to 39 countries across Europe and the Americas and a customer base of 634 organizations over more than 3,200 deliveries. The company's technologies have twice been identified by the Chinese Academy of Sciences' novelty search center as "domestically leading, " underpinning TRUSTECH's role as an industry pace setter and strengthening its domestic market leadership.

About TRUSTECH

TRUSTECH is a high-tech enterprise specializing in the R&D, manufacturing, and commercialization of hollow fiber membrane spinneret heads and spinneret plates. Its solutions power core applications in environmental water purification, medical hemodialysis membranes, and gas separation membranes. By uniting precision engineering with scalable, modular design, TRUSTECH delivers higher efficiency, stability, and lower total cost of ownership for membrane producers worldwide.

Data source: Industry Patent Database