Laboratory Wet Spinning Machine Test Principle And Fiber Forming Process Analysis

Melt spinning, dry spinning, and wet spinning are the three mainstream fiber forming technologies in modern textile and new material research. Each process has unique material adaptability and application boundaries.

Among them, the wet spinning machine is uniquely suitable for processing high-viscosity polymers, bio-based fibers, and recycled fibers that cannot be melted at high temperature.

Mass-production spinning lines fail lab small-batch trials and formula iteration. Lab wet spinning machine delivers reliable pilot data for recycled, biodegradable and functional fiber R&D, linking lab research to industrial manufacturing.

Working Principle of Laboratory Wet Spinning

Core Forming Mechanism

Different from thermal forming methods, wet spinning adopts a solvent diffusion and coagulation forming principle.

The prepared polymer dope is extruded through a precision spinneret and enters the coagulation bath. The solvent diffuses outward, and the polymer precipitates, coagulates, and forms continuous fiber filaments.

The complete lab wet spinning process includes four steps:

• Spinning dope filtration and defoaming pretreatment

• Precision metering and spinneret extrusion

• Solvent exchange and coagulation bath solidification

• Multi-stage drafting and final winding

Three Spinning Processes Comprehensive Comparison

To clarify the positioning and advantages of wet spinning, the following table systematically compares melt spinning, dry spinning, and wet spinning in applicable materials, molding conditions, fiber characteristics and applications.

Core Structure of Laboratory Wet Spinning Machine

Laboratory wet spinning machine adopts a professional modular design to ensure high precision and repeatable experimental data.

• Constant-temperature feeding system: Stabilizes dope viscosity and ensures consistent extrusion volume.

• Replaceable spinneret module: Supports different hole sizes for customized fiber fineness research.

• Temperature & concentration adjustable coagulation bath system: Simulates diverse industrial spinning environments.

• Multi-stage tension drafting & winding system: Optimizes fiber tenacity, uniformity and structural stability.

Standard Laboratory Wet Spinning Process

Standardized operation ensures reliable and repeatable experimental results:

• Dope pretreatment: Filter impurities and remove bubbles to ensure dope purity.

• Parameter calibration: Set coagulation bath temperature, concentration, extrusion speed and drafting speed.

• Fiber forming test: Perform stable extrusion and observe real-time fiber solidification status.

• Sampling and recording: Collect fiber samples and archive all process parameters.

Key Process Parameters Affecting Fiber Quality

The final fiber performance is mainly determined by four core parameters. Reasonable parameter matching is the key to high-quality fiber forming.

Common Defects and Process Optimization

In laboratory wet spinning experiments, broken filaments, merged fibers and uneven fineness are the most common problems.

• Filament breakage: Caused by impure dope or excessive drafting tension. Optimize dope filtration and reduce drafting speed appropriately.

• Merged fibers: Caused by insufficient solvent exchange. Increase bath circulation or reduce extrusion volume.

• Uneven fiber fineness: Caused by temperature drift or blocked spinnerets. Calibrate temperature system and clean spinnerets regularly.

Conclusion

Different from industrial spinning equipment focusing on output, Anytester lab wet spinning machine focuses on flexible formula testing, precise parameter control and repeatable experimental data. It effectively shortens new material R&D cycles and provides accurate technical support for industrial process docking.

Anytester is a professional manufacturer of laboratory spinning and textile testing equipment. Contact us for product parameters, technical cases and customized quotations.