Daicel Chemical Industries, Ltd.

Akihisa Matsuda, Deceased

Masaharu Takegawa

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; and

Filter rod for filtering the smoke of a cigarette

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.

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Osaka, Japan

Akihisa Matsuda, Deceased