Abstract: A filter rod for filtering the smoke of a cigarette including an acetate tow having a high crimp modulus and the acetate tow is bloomed and wrapped by a paper to form the filter rod, wherein a degree of crimping of the acetate tow at a position just downstream of a delivery roller of a filter rod making machine used to form a filter rod is 1.4 or more, and is obtained by conditions satisfying the following equations by having the crimping operation performed under the conditions satisfying the following equations (1) and (2): ##EQU1## wherein: A stands for the weight percent of acetone of the acetate tow just after the tow is fed from a stuffing box type crimping apparatus; andT stands for a temperature of the acetate tow just after the tow is fed from the stuffing box type crimping machine.

Abstract: The object of the present invention is to provide a low-priced automatized weight control device for filter-rods, able to be easily installed in present manufacturing facilities and to be operated easily without any need of special equipment or special operating qualifications.The automatized weight-control device is comprised of a tension gauge measuring the tension in the tow in the first processing step of the tow manufacturing process, and a weight control system to regulate the second processing step to keep the tension in the tow at the specified constant value by increasing the speed of the pretension rollers through the microcomputer by applying the signals transmitted from the tension gauge.

Abstract: An acetate tow having crimp modulus, wherein a degree of crimping of the acetate tow at a position just downstream of a delivery roller of a filter rod making machine used to form a filter rod is 1.4 or more.When the acetate tow is bloomed in the filter rod making machine, a tendency which the acetate tow is caught on a feed roller becomes very low, and when the filter rod is formed of the acetate tow, a filter rod having a high pressure drop can be obtained.The present invention further includes a method of manufacturing the acetate tow, in which a specified acetone content is maintained in the acetate tow and a specified temperature, determined on the basis of the acetone content, is used in a process of crimping the acetate tow.

Abstract: Fibers of narrow cross section for use in tobacco filters composed of cellulose acetate fibers in which the fiber cross section is in a rectangular configuration and the longer/shorter diameter ratio thereof is greater than 5.5.Filters of high filtering performance can be manufactured with a relatively small fiber filling rate.