Meaning of acetate and triacetate? Manufacturing process of acetate and triacetate /difference between acetate triacetate?

textile Designing

ACETATE AND TRIACETATE:

Acetate, which is properly called cellulose acetate (chemically di-acetate or secondary acetate) was first made by Paul Schutzenberger in 1869. The first use of this substancewas as a coating on cotton fabric or as a film similar to cellophane or plastic wrap. As a coating the substance was applied to fabric used in early aeroplanes. Triacetate fibers were developed along with regular acetate. However, manufacture of triacetate into fiber form was delayed until safe solvents became available in sufficient quantity to make production economically profitable. Both Acetate and triacetate continue to be respected fibers for selected types of fabrics however their use has continued to decline over the years.

Manufacturing Process:

Acetate

1. Purified cellulose from wood pulp or cotton linters.

2. Mixed with glacial acetic acid, acetic anhydride and a catalyst.

3. Aged 20 hours-partial hydrolysis occurs.

4. Precipitated as acid resin flakes.

5. Flakes dissolved in acetone.

6. Solution is filtered.

7. Spinning solution extruded in column of warm air solvent recovered

8. Filaments are stretched a bit and wound onto beams, cones, or bobbins ready for use.

Triacetate

1. Same as acetate.

2. Same as acetate.

3. No aging. Solution is ripened. No hydrolysis.

4. Same as acetate.

5. Flakes dissolved in methylene chloride. 6. Same as acetate.

7. Same as acerate.

8. Same as acerate.

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