The application of cellulose acetate flake in the tobacco industry, particularly in cigarette filters, is its most crucial and nearly irreplaceable use. Simply put, cellulose acetate flake serve as the raw material for producing cellulose acetate tow, the core component of the vast majority of cigarette filters.

Core Role: The transition from "film" to "filter" can be summarized as:

Cellulose acetate film → Dissolution → Spinning → Filament → Opening and Forming → Filter stick → Assembly onto cigarettes

Raw material form: Cellulose diacetate exists in the form of white flakes or flocs, which is a synthetic polymer obtained by acetylating natural wood pulp.

Spinning into filaments: The sheet-like cellulose diacetate is dissolved in acetone to form a viscous solution (spinning solution). This solution is then extruded through a spinneret with countless fine holes. In the hot air, the acetone rapidly evaporates, solidifying into extremely fine fibers—these are the cellulose acetate filament bundles.

Filter production: Thousands of such monofilaments are gathered together to form a tuft resembling cotton candy. After being loosened and fluffed, the tuft is wrapped with forming paper and treated with triacetin as a plasticizer to solidify and shape it, ultimately being cut into individual cigarette filters.