Cellulose Acetate Flake is one of the core raw materials for producing Cellulose Acetate Yarn, and its quality and performance directly affect the properties of the finished yarn.

1、 The Influence of Chemical Purity and Vinegar Degree

Acetyl Content:

The acetylation degree of cellulose acetate flakes is usually between 54-56% (based on acetate groups).

If the degree of acetylation is low → the degree of polymerization decreases, the fiber strength is insufficient, and the yarn toughness is poor.

If the degree of vinegar is too high and the solubility decreases, the spinning solution will be unstable and it is easy to block the spinning plate.

Impurities and ash content:

High levels of impurities or metal ions can cause discoloration, degradation, or deposition at the spinning solution nozzle, affecting the uniformity and appearance of the yarn.

2、 The influence of degree of polymerization (DP) on yarn properties

It is ideal to control the polymerization degree between 250-300 (spinning grade).

High degree of polymerization → high viscosity of spinning solution, high yarn strength but decreased spinnability.

Low degree of polymerization → The spinning solution is easy to flow, but the yarn strength is poor and the elongation at break is low.

Therefore, the consistency of the polymerization degree of the raw material directly determines the mechanical properties and production stability of the yarn.

3、 Moisture and thermal stability

Moisture content: Excessive moisture content can affect the dissolution rate and cause fluctuations in the spinning solution ratio; If it is too low, it is prone to static electricity and brittle fracture.

The optimal moisture content is usually controlled between 2.5-4.5%.

Thermal stability: Thermal degradation produces acidic substances, which darken the color of the spinning solution and cause the yarn to turn yellow.

4、 Appearance and solubility effects

The sheet has high transparency, uniform particles, good solubility, and high clarity of the spinning solution.

If there is unacetated cellulose residue or gel in the sheet → it will cause problems such as spinneret and broken ends, which will affect the yarn finish and feel.

5、 The influence of additive residue on yarn characteristics

Some industrial grade cellulose acetate sheets may contain small amounts of plasticizers, stabilizers, or catalytic residues during production, which can affect the yarn's:

Dyeing performance (color difference, dye uptake)

Gloss and Transparency

Heat resistance and moisture absorption of yarn