Polymer Fiber Spinning, Core Fiber Reinforced Spinning Spinneret

Product Overview

The spinneret enables three stream or multi-stream coaxial side-by-side co-extrusion: the outer layer is the polymer dope, the inner layer is the bore fluid, and simultaneously one or three reinforcing filaments are introduced. Through geometric constraint and tension control, a repeatable, uniform, and positionable "rib–matrix" composite structure is formed within the membrane wall.

Essentially, the spinning spinneret is a precision device for "multi-material co-extrusion, "distinct from built-in ribs , protrusions formed by the membrane itself, or post lamination reinforcement. It achieves one shot co-forming of the reinforcement filament and the membrane body, providing a dedicated solution to the insufficient dry/ wet strength and filament breakage issues of wet process NIPS membranes,especially polymeric ones.

Trustech Spinneret Key Design Elements Trustech

The Advantages of Trustech Core Fiber Reinforced Spinning Spinneret Trustech

Precisely embed high strength reinforcing filaments to markedly improve mechanical performance

Enhances mechanical properties without sacrificing separation performance. One or three high-strength fine filaments are stably introduced into the membrane wall at the moment of spinning and co-formed with the matrix, significantly improving tensile strength and resistance to brittle fracture while maintaining the hollow structure and separation accuracy.

High precision multi-channel coaxial architecture for stable positioning and controlled forming

Independent multi-channel coaxial convergence, with filament channel dimensions closely matched to the filament diameter. Under tension and geometric constraints, a positionable "rib–matrix" composite structure is formed, avoiding filament exposure and non-uniform strength.

NIPS compatible process with stable lumen and reliable continuous production

Forced synchronous co-forming and optimized flow-path design ensure undisturbed phase separation, uniform pore structure (void fraction deviation ≤ 3%), and a non-collapsing lumen, enabling stable continuous spinning and high yield.

Product Parameters

Suitable Materials

PET (Polyethylene Terephthalate), PP (Polypropylene), PA6( Polyamide 6 ), PE(Polyethylene), PLA (Polylactide), TPU (Thermoplastic Polyurethane), PPS (Polyphenylene Sulfide), PTT (Polytrimethylene Terephthalate), PBT (Polybutylene Terephthalate), PVA (Polyvinyl Alcohol ), PAN (Polyacrylonitrile ), PEEK (Polyether Ether Ketone), PVDF-HFP ( Poly vinylidene fluoride-co-hexafluoropropylene)

Functional features

Optimized for wet-process NIPS, balancing strength and separation performance

Forced synchronous co-forming

By controlling the reinforcement filament feed speed to synchronize with the dope extrusion speed deviation ≤ 5%, the filament and dope are extruded simultaneously at the spinneret orifice and then enter the coagulation bath together to undergo phase separation. This ensures a tight interface between filament and membrane with no gaps or delamination peel off strength ≥ 5 N/cm).

Non-disruptive to phase separation

The flow channel design of the dope path, e.g., tapered outlet, filleted corners without dead zones, ensures uniform dope outflow, avoiding flow disturbances caused by the filament channel, thereby preventing membrane defects such as uneven porosity or pinholes and maintaining separation accuracy (e.g., MWCO deviation ≤ 10%).

Stable hollow structure

The annular gap between the bore-fluid and dope channels is uniform (deviation ≤ 0.01 mm). Even with added reinforcement filaments, the bore fluid can uniformly wet the inner surface of the dope to form a lumen with stable dimensions, void fraction deviation ≤ 3%, preventing lumen collapse or deformation.

Common Specifications

Customer Membrane Examples

FAQ