# US 5,348,027 A · Cigarette with improved substrate

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- Number: US 5,348,027 A
- Document ID: US5348027A
- Status: Granted
- Kind: A
- Application number: 07/882,209
- Filed: 1992-05-13
- Granted: 1994-09-20
- Earliest claimed: 1991-02-14
- Assignees: R. J. Reynolds Tobacco Company
- Inventors: Russell D. Barnes; Chandra K. Banerjee; Evon L. Crooks; Jack F. Clearman
- Web page: https://patentgrep.com/patent/US5348027A

## CPC

- A24B 15/165: {comprising as heat source a carbon fuel or an oxidized or thermally degraded carbonaceous fuel, e.g. carbohydrates, cellulosic material}
- A24D 1/22: Cigarettes with integrated combustible heat sources, e.g. with carbonaceous heat sources
- A24B: MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES

## Abstract

A new substrate for cigarettes includes an overwrapped rod of gathered cellulose-based paper having an outer diameter of from about 4 mm to about 8 mm; wherein the paper has a basis weight in the range of about 10 g/m.sup.2 to about 90 g/m.sup.2 ; and the paper can include up to about 50 weight percent of one or more burn retardant hydrated salts. The substrate typically comprises an overwrapped rod of a gathered web of a nonwoven cellulosic material, having a length of about 10 mm; wherein the dry unit weight of the substrate rod is from about 20 mg to about 120 mg; and wherein the web of cellulosic material is embossed or scored prior to gathering, thereby providing a substrate rod with a pressure drop of from about 2 to about 40 mm of H.sub.2 O, under FTC conditions. When employed in a cigarette at a 10 mm length, the substrate is typically capable of generating an aerosol density of at least about 2000 Units for at least about 50% of the puffs, preferably for at least about 80% of the puffs (under 50/30 smoking conditions).

## Claims

### Claim 1

A substrate for smoking articles comprising an overwrapped rod of gathered cellulose-based paper;
said overwrapped rod having an outer diameter of from about 4 mm to about 8 mm, and wherein;
said cellulose-based paper has a basis weight in the range of about 10 g/m.sup.2 to about 90 g/m.sup.2 ; and
said cellulose-based paper including up to about 50 weight percent of one or more burn retardant hydrated salts.

### Claim 2 (depends on 1)

The substrate of claim 1, wherein the burn retardant hydrated salt comprises a water insoluble salt, added to the paper as a filler, at about 20 to about 40 weight percent.

### Claim 3 (depends on 1)

The substrate of claim 1, wherein the burn retardant hydrated salt comprises a water soluble salt, applied to the paper as a coating, at up to about 30 weight percent.

### Claim 4 (depends on 1)

The substrate of claim 1, wherein the burn retardant hydrated salt comprises a water soluble salt, applied to the paper as a coating, at about 15 to about 25 weight percent.

### Claim 5 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the basis weight of the paper before the addition of any hydrated salt is in the range of about 15 g/m.sup.2 to about 60 g/m.sup.2.

### Claim 6 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the basis weight of the paper before the addition of any hydrated salt is in the range of about 30 g/m.sup.2 to about 40 g/m.sup.2.

### Claim 7 (depends on 1, 2)

The substrate of claims 1, 2, or 3, which, when formed into a rod having the dimensions of about 10 mm long and about 7.5 mm in diameter, provides a pressure drop in the range of about 2 mm H.sub.2 O to about 40 mm H.sub.2 O.

### Claim 8 (depends on 1, 2)

The substrate of claims 1, 2, or 3, which, when formed into a rod having the dimensions of about 10 mm long and about 7.5 mm in diameter, provides a pressure drop in the range of about 5 mm H.sub.2 O to about 20 mm H.sub.2 O.

### Claim 9 (depends on 1, 2)

The substrate of claims 1, 2, or 3, in which the paper has a density within the range of about 0.20 g/cc to about 3.5 g/cc.

### Claim 10 (depends on 1, 2)

The substrate of claims 1, 2, or 3, in which the paper has a density within the range of about 0.35 g/cc to about 2.5 g/cc.

### Claim 11 (depends on 1, 2)

The substrate of claims 1, 2, or 3, in which the width per rod area of the cellulosic material used to form the substrate is within the range of about 2 mm/mm.sup.2 to about 7 mm/mm.sup.2.

### Claim 12 (depends on 1, 2)

The substrate of claims 1, 2, or 3, in which the width per rod area of the cellulosic material used to form the substrate is within the range of about 3 mm/mm.sup.2 to about 5 mm/mm.sup.2.

### Claim 13 (depends on 1, 2)

The substrate of claims 1, 2, or 3, in which the linear width of the cellulose-based paper prior to formation of the substrate rod ranges from about 25 mm to about 305 mm.

### Claim 14 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the diameter of the substrate is about 4.5 mm and the linear width of the paper web prior to formation of the substrate rod ranges from about 25 mm to about 125 mm.

### Claim 15 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the diameter of the substrate is about 4.5 mm and the linear width of the cellulose based paper prior to formation of the substrate rod ranges from about 50 mm to about 90 mm.

### Claim 16 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the diameter of the substrate is about 7.5 mm and the linear width of the cellulose-based paper web prior to formation of the substrate rod ranges from about 125 mm to about 305 mm.

### Claim 17 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the diameter of the substrate is about 7.5 mm and the linear width of the cellulose-based paper web prior to formation of the substrate rod ranges from about 150 mm to about 200 mm.

### Claim 18 (depends on 1, 2)

The substrate of claims 1, 2, or 3, which further comprises an aerosol forming substance at from about 100% to 250% by weight loading.

### Claim 19 (depends on 1, 2)

The substrate of claims 1, 2, or 3, which further comprises an aerosol forming substance at from about 150% to 225% by weight loading.

### Claim 20 (depends on 1, 2)

The substrate of claims 1, 2, or 3, which further comprises an aerosol forming substance at from about 175% to 200% by weight loading.

### Claim 21 (depends on 1, 2)

The substrate of claims 1, 2, or 3, further having a dry unit weight of from about 2 mg/mm to about 12 mg/mm of substrate length, before the addition of aerosol forming materials.

### Claim 22 (depends on 1, 2)

The substrate of claims 1, 2, or 3, further having a dry unit weight of from about 4 mg/mm to about 9 mg/mm of substrate length, before the addition of aerosol forming materials.

### Claim 23 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the overwrap is a paper which is chemically treated to reduce migration of any aerosol forming materials loaded on the cellulose-based paper.

### Claim 24 (depends on 1, 2)

The substrate of claims 1, 2, or 3, wherein the overwrap is a foil-lined paper.