| 摘要 |
<p>1,126,330. Tobacco smoke filters. EASTMAN KODAK CO. 16 Dec., 1965 [21 Dec., 1964], No. 53384/65. Heading A2C. {Also in Division D1] A cylindrical tobacco smoke filter rod is made from a tow of crimped continuous filamentse.g. of a denier less than 3 - by forming the tow into a band or ribbon, subjecting the band to tension sufficient to remove the secondary crimps therefrom, separating the filaments by longitudinally displacing portions of the tow with respect to adjacent portions, spreading the tow to a uniform constant width by means of a banding jet supplied with high velocity gas, applying a thin uniform coating of plasticizer to one or both surfaces of the spread tow, further separating the filaments and uniformly distributing the plasticizer therein by means of a gas jet and finally shaping the tow into a cylindrical form in which the filaments are fused to one another at random points by the action of a plasticizer. The filaments are displaced longitudinally by being passed between a bottom resilient surfaced roller and a top grooved roller pneumatically pressed against the bottom roller. The top roller has continuous or interrupted circumferential square-form cross-section grooves. The plasticizer is applied by means of rotating rollers -Fig. 2 (not shown) - which ares supplied with the liquid plasticizer by means of wicks connected to a plasticizer reservoir fed by a metering pump. The plasticizer may be triacetin, if the filaments are composed of cellulose acetate. To increase the removal of the phenol component from tobacco smoke, a high molecular weight polyethylene glycol liquid additive may be used to coat one side of the tow instead of the plasticizer. After the plasticizer has been uniformly distributed in the tow but before the cylindrical rod is formed particulate material - e.g. activated carbon, sodium bicarbonate, rice starch, cellulose acetate floc - may be added to the tow.</p> |
