Application case of wet spinning forming of sodium alginate graphene oxide composite fiber monofilament Small desktop equipment

The wet spinning forming process can be divided into two parts: process flow and forming principle:

1、 Process flow

1. Preparation of spinning solution: Dissolve the fibrous polymer in a suitable solvent to form a uniform solution;

2. Raw liquid treatment: remove impurities and bubbles through filtration to ensure solution homogeneity and stability;

3. Spinning extrusion: The flow rate is precisely controlled by a metering pump to extrude a fine stream of the original solution from the nozzle holes immersed in the coagulation bath; ‌

4. Coagulation forming: the raw liquid trickle and coagulation bath (mostly water/solvent mixture) have a double diffusion effect, and the polymer precipitates to form gelled primary fiber;

5. Post processing steps:

(1) Stretching: Improve fiber orientation and mechanical properties

(2) Water washing: removing residual solvents and coagulants

(3) Oiling: Improving fiber flexibility and anti-static properties

(4) Dry heat setting: stabilizing fiber structure

(5) Winding/Cutting: Finished product packaging.

2、 Forming principle

1. The core is the solvent coagulant dual diffusion mechanism;

2. The solvent diffuses from the original liquid stream to the coagulation bath;

3. Coagulant (such as water) reverse osmosis into the fine stream of the original liquid;

4. Polymers undergo phase separation in a non solvent environment and gradually solidify to form fiber structures.

This process is accompanied by gel shrinkage and solvent removal, and finally forms solid fibers with microporous structure.