Paper having crossdirectional regions of variable basis weight
| Title: | Paper having crossdirectional regions of variable basis weight |
|---|---|
| Patent Number: | 5,474,095 |
| Publication Date: | December 12, 1995 |
| Appl. No: | 08/224,086 |
| Application Filed: | April 06, 1994 |
| Abstract: | This invention refers to a paper having crossdirectional regions having increased basis weight. The paper of this invention is especially useful as a wrapping material for a smoking article. The paper may be produced by depositing additional material onto a moving base web in a papermaking machine. The additional material is deposited by means of a rotating drum containing a plurality of slits through which the additional material passes. |
| Inventors: | Allen, Jeffery L. (Midlothian, VA); Bokelman, Gordon H. (Chesterfield, VA); Gautam, Navin (Richmond, VA); Kraske, David J. (Orrington, ME); Myracle, Jr., James L. (Midlothian, VA); Rogers, Robert M. (Richmond, VA); Sanders, Edward B. (Richmond, VA) |
| Assignees: | Philip Morris Incorporated (New York, NY) |
| Claim: | We claim |
| Claim: | 1. A nonlaminated cigarette paper comprising a base web portion and a plurality of crossdirectional regions, said base web portion having a basis weight in the range of approximately 25 to 70 grams per meter squared, said crossdirectional regions having a basis weight from 0.01% to about 30% above the basis weight of the base web portion, the crossdirectional regions having a porosity of up to about 10 Coresta, said porosity of said crossdirectional regions being less than a porosity of the base web portion such that a burn rate of a cigarette that incorporates said cigarette paper is less at said crossdirectional regions than at said base web portion. |
| Claim: | 2. The nonlaminated cigarette paper of claim 4, wherein said base web comprises cellulosic fiber. |
| Claim: | 3. The cigarette paper of claim 1 in which each crossdirectional region extends completely across said nonlaminated cigarette paper. |
| Claim: | 4. The nonlaminated cigarette paper of claim 1, wherein each crossdirectional region is divided into a plurality of separate sections which are non-contiguous in the crossdirection. |
| Claim: | 5. The paper of claim 1, wherein the crossdirectional regions have a width of about 1 mm to about 10 mm. |
| Claim: | 6. The paper of claim 1, wherein the crossdirectional regions have a width of about 1.5 mm to about 5 mm. |
| Claim: | 7. The paper of claim 1, wherein the crossdirectional regions have a width of about 5 mm. |
| Claim: | 8. The paper of claim 1, wherein the crossdirectional regions are positioned about 5 mm to about 40 mm apart. |
| Claim: | 9. The nonlaminated cigarette paper of claim 8, wherein the crossdirectional regions have a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 10. The nonlaminated cigarette paper of claim 4, wherein the crossdirectional regions are spaced about 15 mm to about 30 mm apart. |
| Claim: | 11. The nonlaminated cigarette paper of claim 4, wherein the crossdirectional regions are positioned about 21 mm apart. |
| Claim: | 12. The nonlaminated cigarette paper of claim 4, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web portion. |
| Claim: | 13. The nonlaminated cigarette paper of claim 12, in which each crossdirectional region extends completely across nonlaminated cigarette paper. |
| Claim: | 14. The nonlaminated paper of claim 13, wherein each crossdirectional region is divided into a plurality of separate sections which are non-contiguous in the crossdirection. |
| Claim: | 15. The nonlaminated paper of claim 12, wherein the crossdirectional regions have a width of about 1 mm to about 10 mm. |
| Claim: | 16. The nonlaminated paper of claim 12, wherein the crossdirectional regions have a width of about 1.5 mm to about 5 mm. |
| Claim: | 17. The nonlaminated paper of claim 12, wherein the crossdirectional regions have a width of about 5 mm. |
| Claim: | 18. The nonlaminated paper of claim 12, wherein the crossdirectional regions are positioned about 5 mm to about 40 mm apart. |
| Claim: | 19. The nonlaminated cigarette paper of claim 1, wherein the crossdirectional regions are positioned about 21 mm apart and have a thickness of no more than, 10% greater than the thickness of the base web portion. |
| Claim: | 20. The cigarette paper of claim 1, wherein said crossdirectional regions comprise base web material and an additional material, said additional material including a filler. |
| Claim: | 21. The cigarette paper of claim 4, wherein said crossdirectional regions are formed by additional material added to a pulp web in a paper making machine. |
| Claim: | 22. The paper of claim 21, wherein said additional material is selected from the group consisting of refined pulp, high surface area cellulosic fibers, micro-crystalline cellulose and a mixture of highly refined pulp and calcium carbonate. |
| Claim: | 23. A nonlaminated cigarette paper comprising a base web portion and a plurality of crossdirectional regions, said crossdirectional regions having a basis weight from 0.01% to about 30% above a basis weight of the base web portion and a porosity less than the porosity of the base web portion, such that a burn rate of a cigarette that incorporates said cigarette paper is less at said crossdirectional regions than at said base web portion; |
| Claim: | wherein the base web portion has a porosity of about 25 to about 60 Coresta and the crossdirectional regions have a porosity of up to about 10 Coresta. |
| Claim: | 24. The cigarette paper of claim 23, wherein said crossdirectional regions include a material additional to said base web portion, said additional material being selected from the group consisting of refined pulp, high surface area cellulosic fibers, micro-crystalline cellulose and a mixture of highly refined pulp and calcium carbonate. |
| Claim: | 25. A smoking article comprising a tobacco rod overwrapped with a nonlaminated cigarette paper, said cigarette paper comprising a base web portion of cellulosic fiber and a plurality of crossdirectional regions of increased basis weight and decreased porosity, wherein the basis weight of said crossdirectional regions is about 0.01% to about 30% above the basis weight of said base web portion, said crossdirectional regions having a static burn rate less than said base web portion. |
| Claim: | 26. The smoking article of claim 25, wherein the cross directional regions have a width of about 1 mm to about 10 mm. |
| Claim: | 27. The smoking article of claim 26, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 28. The smoking article of claim 25, wherein the cross directional regions have a width of about 3 mm to about 7 mm. |
| Claim: | 29. The smoking article of claim 28, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 30. The smoking article of claim 25, wherein the cross directional regions have a width of about 2.5 mm. |
| Claim: | 31. The smoking article of claim 30, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 32. The smoking article of claim 25, wherein the crossdirectional regions are spaced about 15 mm to about 30 mm apart. |
| Claim: | 33. The smoking article of claim 32, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 34. The smoking article of claim 22, wherein the crossdirectional regions are positioned about 21 mm apart. |
| Claim: | 35. The smoking article of claim 34, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 36. The smoking article of claim 25, wherein the base web portion has a porosity of about 25 to about 60 Coresta and the crossdirectional regions have a porosity of up to about 10 Coresta. |
| Claim: | 37. The smoking article of claim 36, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 38. The smoking article of claim 25, wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web. |
| Claim: | 39. The smoking article of claim 25, wherein said crossdirectional regions comprise base web material and an additional material, said additional material including a filler. |
| Claim: | 40. The smoking article of claim 25, wherein said crossdirectional regions include a material additional to said base web portion, said additional material being selected from the group consisting of refined pulp, high surface area cellulosic fibers, micro-crystalline cellulose and a mixture of highly refined pulp and calcium carbonate. |
| Claim: | 41. A nonlaminated cigarette paper comprising a base web portion and a plurality of crossdirectional regions having a basis weight from 0.01% to about 30% above a basis weight of the base web portion and a porosity less than the porosity of the base web portion, wherein the base web portion has a porosity of about 25 to about 60 Coresta and the crossdirectional regions have a porosity of up to about 10 Coresta, and wherein the crossdirectional region has a thickness of no more than 10% greater than the thickness of the base web portion. |
| Claim: | 42. The cigarette paper of claim 41, wherein said crossdirectional regions comprise base web material and an additional material, said additional material including a filler. |
| Current U.S. Class: | 131/365; 162/125 |
| Current International Class: | A24D 102 |
| Patent References Cited: | 1555320 September 1925 Weil 1847269 March 1929 Schur 1903236 March 1933 Johnsen 1996002 March 1935 Seaman 1999222 April 1935 Weinberger 2013508 September 1935 Seaman 2049320 July 1936 Ruben et al. 2666437 January 1954 Lattof 3477440 November 1969 Licis 3560334 February 1971 Arledter 3632384 January 1972 Saint-Pastou 3633589 January 1972 Kahane et al. 3915176 October 1975 Heitmann et al. 4153503 May 1979 Booth et al. 4239591 December 1980 Blake 4489738 December 1984 Simon 4739775 April 1988 Hampl, Jr. 4928715 May 1990 Mentzel et al. 4945932 August 1990 Mentzel et al. 4987940 January 1991 Straub et al. 5028224 July 1991 Pieper et al. |
| Other References: | Casey, Pulp and Paper Chemistry and Chemical Technology, vol. III, 3rd Edition, pp. 1751-1756, 1981. |
| Primary Examiner: | Bahr, Jennifer |
| Attorney, Agent or Firm: | Glenn, Charles E. B. Schardt, James E. Osborne, Kevin B. |
| Accession Number: | edspgr.05474095 |
| Database: | USPTO Patent Grants |
| Language: | English |
|---|