Claims
- 1. The method of making filters for smoking articles comprising the steps of:
- supplying a first filamentary tow of filter material in a first substantially continuous axial stream;
- annularly compressing the tow in said first stream to produce a substantially cylindrical first rod;
- supplying a second filamentary tow of filter material in a second substantially continuous axial stream;
- forming the tow in said second stream into an annulus around said first rod and annularly compressing said annulus to form a second rod in which said first rod is embedded;
- adding flavorant to at least one component of said second rod;
- supplying a plugwrap in a substantially continuous axial stream; and
- securing said plugwrap concentrically around said second rod.
- 2. The method defined in claim 1 wherein the tow in said first stream is compressed to a density different from the density to which the tow in said second stream is compressed so that when the smoking article in which the resulting filter is included is smoked, more of the smoke flows through the filter material of lower density than flows through the filter material of higher density.
- 3. The method defined in claim 2 wherein said flavorant is added to the component of said second rod that is compressed to lower density.
- 4. The method defined in claim 3 wherein the lower density component is the first rod.
- 5. The method defined in claim 2 wherein the flavorant is a PVA-flavorant.
- 6. The method defined in claim 4 wherein the flavorant is PVA-menthol.
- 7. The method of making filters for smoking articles comprising the steps of:
- supplying a first filamentary tow of filter material in a first substantially continuous axial stream;
- annularly compressing the tow in said first stream to produce a substantially cylindrical first rod;
- supplying a second filamentary tow of filter material in a second substantially continuous axial stream;
- forming the tow in said second stream into an annulus around said first rod and annularly compressing said annulus to form a second rod in which said first rod is embedded;
- supplying a plugwrap in a substantially continuous axial stream;
- securing said plugwrap concentrically around said second rod; and
- applying stream to said first rod to stabilize it prior to forming the tow in said second stream around said first rod.
- 8. The method of making filters for smoking articles comprising the steps of:
- supplying a first filamentary tow of filter material in a first substantially continuous axial stream;
- annularly compressing the tow in said first stream to produce a substantially cylindrical first rod;
- supplying a second filamentary tow of filter material in a second substantially continuous axial stream;
- forming the tow in said second stream into an annulus around said first rod and annularly compressing said annulus to form a second rod in which said first rod is embedded;
- supplying a plugwrap in a substantially continuous axial stream;
- securing said plugwrap concentrically around said second rod;
- supplying a wrapping web in a substantially continuous axial stream; and
- adding said wrapping web to said first rod by securing said wrapping web concentrically around said first rod prior to forming the tow in said second stream around said first rod.
- 9. Apparatus for making filters for smoking articles comprising:
- means for supplying a first filamentary tow of filter material in a first substantially continuous axial stream;
- means for annularly compressing the tow in said first stream to produce a substantially cylindrical first rod;
- means for supplying a second filamentary tow of filter material in a second substantially continuous axial stream;
- means for forming the tow in said second stream into an annulus around said first rod and annularly compressing said annulus to form a second rod in which said first rod is embedded;
- means for adding a flavorant to at least one component of said second rod;
- means for supplying a plugwrap in a substantially continuous axial stream; and
- means for securing said plugwrap concentrically around said second rod.
- 10. The apparatus defined in claim 9 wherein said means for annularly compressing the tow in said first steam compresses said first stream tow to a density different from the density to which said means for forming the tow in said second stream compresses said second stream tow.
- 11. The apparatus defined in claim 10 wherein said means for adding flavorant adds flavorant to the component of said second rod that is compressed to lower density.
- 12. The apparatus defined in claim 11 wherein said means for annularly compressing the tow in said first stream compresses said first stream tow to a lower density than the density to which said means for forming the tow in said second stream compresses said second stream tow.
- 13. The apparatus defined in claim 10 wherein said means for adding flavorant adds a PVA-flavorant.
- 14. The apparatus defined in claim 12 wherein said means for adding flavorant adds PVA-menthol.
- 15. Apparatus for making filters for smoking articles comprising:
- means for supplying a first filamentary tow of filter material in a first substantially continuous axial stream;
- means for annularly compressing the tow in said first stream to produce a substantially cylindrical first rod;
- means for supplying a second filamentary tow of filter material in a second substantially continuous axial stream;
- means for forming the tow in said second stream into an annulus around said first rod and annularly compressing said annulus to form a second rod in which said first rod is embedded;
- means for supplying a plugwrap in a substantially continuous axial stream;
- means for securing said plugwrap concentrically around said second rod; and
- means for applying steam to said first rod to stabilize it prior to forming the tow in said second stream around said first rod.
- 16. Apparatus for making filters for smoking articles comprising:
- means for supplying a first filamentary tow of filter material in a first substantially continuous axial stream;
- means for annularly compressing the tow in said first stream to produce a substantially cylindrical first rod;
- means for supplying a second filamentary tow of filter material in a second substantially continuous axial stream;
- means for forming the tow in said second stream into an annulus around said first rod and annularly compressing said annulus to form a second rod in which said first rod is embedded;
- means for supplying a plugwrap in a substantially continuous axial stream;
- means for securing said plugwrap concentrically around said second rod;
- means for supplying a wrapping web in a substantially continuous stream; and
- means for adding said wrapping web to said first rod by securing said wrapping web concentrically around said first rod prior to forming the tow in said second stream around said first rod.
- 17. A smoking article filter comprising:
- a substantially cylindrical inner member of filter material having a first density;
- an outer member of filter material concentrically surrounding said inner member and having a second density greater than said first density;
- a plugwrap concentrically surrounding said outer member; and
- a PVA-flavorant associated with said inner member.
- 18. The filter defined in claim 17 wherein said flavorant is PVA-flavorant.
- 19. A smoking article filter comprising:
- a substantially cylindrical inner member of filter material having a first density;
- a wrapping layer concentrically surrounding said inner member;
- an outer member of filter material concentrically surrounding said wrapping layer and having a second density different from said first member;
- a plugwrap concentrically surrounding said outer member; and
- a flavorant associated with at least one of said inner and outer members.
Parent Case Info
This application is a continuation-in-part of U.S. patent application Ser. No. 799,750 filed Nov. 19, 1985, now U.S. Pat. No. 4,715,390 which is hereby incorporated by reference herein.
US Referenced Citations (4)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
799750 |
Nov 1985 |
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