Process of making cellulose acetate tow
View Patent ↗In the manufacture of a fiber tow, particularly cellulose acetate tow, a stuffer box crimper has a pair of nip rollers, at least one, made of a solid ceramic material.
1. A process for making a cellulose acetate tow comprising the steps of:
spinning a dope comprising a solution of cellulose acetate and solvent,
taking-up the as-spun cellulose acetate filaments,
lubricating the cellulose acetate filaments,
forming a tow from the cellulose acetate filaments,
crimping the tow by means of a stuffer box crimper comprising a pair of nip rollers adapted to engage the tow, one roller being made of a solid ceramic material, a pair of cheek plates juxtaposed to said pair of nip rollers adapted to keep the tow between said pair of nip rollers, a pair of doctor blades adjacent to an exit end of said pair of nip rollers adapted to prevent the tow from sticking to said pair of nip rollers, and a stuffer box having a stuffer channel adjacent said pair of doctor blades adapted to receive the tow into said channel from said pair of nip rollers, and a flapper located at a distal end of said channel adapted to bearingly engage the tow,
drying the crimped tow, and
baling the dried crimped tow.
2. The process of claim 1 wherein the stuffer box crimper further comprises said solid ceramic material being selected from the group consisting of unhipped MgO stabilized zirconia, hipped MgO stabilized zirconia, unhipped yttria stabilized zirconia, or hipped yttria stabilized zirconia.
3. The process of claim 2 wherein the stuffer box crimper further comprises said solid ceramic material being a hipped yttria stabilized zirconia.
4. The process of claim 1 wherein the stuffer box crimper further comprises said solid ceramic material having a surface roughness of no greater than 16 rms.