Claims
- 1. A tobacco filter material in the form of a sheet having a web structure and comprising a cellulose ester short staple, wherein said cellulose ester short staple is
- a non-crimped cellulose ester short staple having a modified cross section, wherein the ratio of a diameter D1 of a circumscribed circle of the cross section relative to the diameter D2 of an inscribed circle of said cross section is such that D1:D2 is 2.3:1 to 5:1.
- 2. A tobacco filter material as claimed in claim 1, wherein the sectional configuration of said cellulose ester short staple is in X-, Y- H- or I-configuration.
- 3. A tobacco filter material as claimed in claim 1, wherein said cellulose ester is an ester with an organic acid having 2 to 4 carbon atoms.
- 4. A tobacco filter material as claimed in claim 1, wherein said cellulose ester is a cellulose acetate having an average degree of substitution of 1.5 to 3.0.
- 5. A tobacco filter material as claimed in claim 1, which further comprises a beaten pulp.
- 6. A tobacco filter material as claimed in claim 5, wherein said beaten pulp is a wood pulp.
- 7. A tobacco filter material as claimed in claim 5, wherein the proportion of said cellulose ester short staple to said beaten pulp is 90/10 to 20/80 (by weight).
- 8. A tobacco filter material as claimed in claim 5, wherein said cellulose ester short staple is a short staple having a mean fiber length of 1 to 10 mm and a fiber fineness of 1 to 10 deniers, the degree of beating of said beaten pulp is a Schopper-Riegler freeness of 20 to 90.degree. SR.
- 9. A tobacco filter material as claimed in claim 1, which further comprises a binder.
- 10. A tobacco filter material as claimed in claim 1, which is creped or embossed.
- 11. A tobacco filter material as claimed in claim 10, wherein the pitch and depth of grooves for creping and the pitch and depth of an embossing pattern are 0.3 to 5 mm for pitch and 0.1 to 2 mm for depth.
- 12. A tobacco filter material as claimed in claim 1, which has a web structure obtainable by wet webbing.
- 13. A tobacco filter material in the form of a sheet comprising a cellulose acetate short staple having a mean fiber length of 2 to 8 mm, a fiber fineness of 2 to 8 deniers and an average degree of substitution of 1.5 to 3.0, a beaten wood pulp having a degree of beating of a Schopper-Riegler freeness of 20 to 80.degree. SR in a proportion of such that the ratio of cellulose ester short staple: beaten wood pulp is 80:20 to 30:70 (by weight), wherein said cellulose acetate short staple is
- a non-crimped cellulose acetate short staple having a modified cross section, wherein the ratio of a diameter D1 of a circumscribed circle relative to the diameter D2 of the inscribed circle is such that D1:D2 is 2.3:1 to 5:1.
- 14. A tobacco filter material as claimed in claim 13, which further comprises a water-soluble binder.
- 15. A tobacco filter material as claimed in claim 14, wherein the proportion of said water-soluble binder as a dry basis is 0.1 to 10% by weight based on the total amount of the filter material.
- 16. A tobacco filter which comprises a filter material in the form of a sheet, where said filter material has a web structure and comprises a cellulose ester short staple, wherein said cellulose ester short staple is
- a non-crimped cellulose ester short staple having a modified cross section, wherein the ratio of a diameter D1 of a circumscribed circle of the cross section of said short staple relative to the diameter D2 of an inscribed circle of said cross section is such that D1:D2 is 2.3:1 to 5:1, and said filter material is wrapped up into the form of a rod.
- 17. A cigarette provided with a tobacco filter as claimed in claim 16.
Priority Claims (2)
Number |
Date |
Country |
Kind |
6-292148 |
Oct 1994 |
JPX |
|
6-292149 |
Oct 1994 |
JPX |
|
RELATED APPLICATIONS
This application is a continuation of application Ser. No. 08/550,640 which was filed on Oct. 31, 1995 now U.S. Pat. No. 5,678,577.
US Referenced Citations (9)
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Entry |
Anon, "Interconversion of Freeness and Wetness Tests, Tappi Data Sheet 20", Technical Association of the Pulp and Paper Industry, Atlanta, GA, 1945. |
Continuations (1)
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Number |
Date |
Country |
Parent |
550640 |
Oct 1995 |
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