TRUSTECH Secures Patent for Single Orifice Dual-Layer Hollow Fiber Spinneret
China TRUSTECH announced a new utility patent for a single orifice hollow fiber membrane spinneret head engineered for dual mode production of homogeneous hollow fibers and braided tube reinforced hollow fibers. By re architecting fluid paths and precision alignment, the design expands process flexibility for research lines and specialty materials. As a China leading membrane spinning machine and hollow fiber membrane spinneret manufacture, TRUSTECH is advancing higher consistency and broader adaptability in industrial membrane spinning.
Key technical innovations
Dual fluid path architecture
Top feed core liquid: The core dope enters through an inlet in the spinneret base and travels via a cylindrical boss directly into the needle tube center to establish a stable core stream.
Side feed shell liquid: The shell dope enters through a lateral inlet on the spinneret body, fills a cylindrical chamber, and is distributed circumferentially to the forming orifice to encapsulate the core and form the hollow structure.
Multi function production adaptability
Homogeneous hollow fiber: Independently routed core and shell paths create uniform wall thickness tubular fibers.
Braided tube reinforcement: A braid is fed from a top entry through the needle tube passage; shell liquid coats the braid surface and gels to form an internally reinforced composite membrane—while also supporting horizontal discharge research equipment.
Precision flow and structural optimization
Inverted cone boss beneath the cylindrical outlet guides accurate core/shell convergence and suppresses disturbances.
Tapered lead in at the forming orifice entrance promotes laminar transition and reduces defects.
Strictly coaxial inlets, core flow passage, and forming orifice maintain concentric extrusion and diameter consistency.
Modular, high accuracy assembly
The base, body, and cap are secured with screws and locating pins for repeatable positioning. A controlled clearance between the needle tube OD and forming orifice ID creates a stable annular shell liquid layer.
Company technology leadership
TRUSTECH is a high-tech enterprise dedicated to the R&D, manufacturing, and sales of hollow fiber membrane spinneret heads and spinneret plates for environmental water purification, medical hemodialysis membranes, gas separation membranes, and wider water, healthcare, and chemical applications. 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. TRUSTECH holds 41 independent IP rights and led the "Hollow Fiber Membrane Spinneret Plate " group standard, closing a long standing standards gap. Its products have shipped in 3,200+ batches to 634 customers across 39 countries, with leading domestic market share, and its innovations have twice been identified by the Chinese Academy of Sciences' novelty search center as "domestically leading. "
In 2026, TRUSTECH launched MEMTOOLS—an online toolkit for capacity estimation, spinneret plate selection during R&D, and process tuning—providing practical empowerment that boosts efficiency from pilot to plant.
Why it matters
The patented single orifice spinneret head overcomes the limited adaptability of legacy designs by uniting top feed core flow with side feed shell flow and precision coaxial geometry. It lets operators switch seamlessly between homogeneous and reinforced fiber modes while retaining compatibility with transverse discharge setups—broadening application space and improving production stability.
About TRUSTECH
TRUSTECH continues to drive structural and fluid control innovation in spinneret plates, reinforcing its role as a trusted partner to global membrane producers and accelerating the transition to efficient, stable, and scalable hollow fiber manufacturing.
Data source: Industry patent database
About Trustech