GB2126073A

GB2126073A - Tipping assembly for an elongate smoking article

Info

Publication number: GB2126073A
Application number: GB08323244A
Authority: GB
Inventors: Christopher Ralph Bale; Beresford Roy Gill; David Wyn Bassett
Original assignee: Imperial Group PLC
Current assignee: Imperial Group PLC
Priority date: 1982-09-01
Filing date: 1983-08-30
Publication date: 1984-03-21
Also published as: GB8323244D0; DE3374164D1; EP0102247B1; GB2126073B; EP0102247A1

Description

1 GB 2 126 073 A 1

SPECIFICATION

Tipping assembly for an elongate smoking article This invention relates to a tipping assembly for an elongate smoking article, such as a cigarette.

Traditional methods of achieving low tar yields from a cigarette in combination with high nicotine 5 levels and low carbon monoxide levels use high levels of filtration and ventilation, but have the 5 disadvantages of a high pressure drop perceived by the smoker and a reduced subjective response compared with the pressure drop and subjective response associated with a non-filter cigarette.

It is an object of the present invention to provide a tipping assembly that substantially reduces the above disadvantages.

10 According to the present invention there is provided a tipping assembly for an elongate smoking 10 article, the assembly comprising an open-ended tube provided with a plurality of apertures spaced round the circumference of the tube, thereby dividing the tube into two sections and providing communication between the inside and outside of the tube, and a tipping wrapper surrounding the tube, characterised in that said portion of the tipping wrapper overlying the apertures is adapted to permit gas 15. flow both through the apertures and said portion and to offer greater resistance to the gas flow than is 15 provided by the apertures alone.

The invention will now be described by way of example only with reference to the accompanying non-scaled diagrammatic drawings in which, Figure 1 is an exploded perspective view of a first embodiment of a cigarette rod and tipping 20 assembly according to the invention, 20 Figure 2 is a longitudinal cross-section through the cigarette rod and tipping assembly of Figure 1, when assembled, Figure 3 is an exploded perspective view of a second embodiment of a cigarette rod and tipping assembly according to the invention, 25 Figure 4 is a longitudinal cross-section through the cigarette rod and tipping assembly of Figure 3, 25 when assembled, Figure 5 is a longitudinal section through a third embodiment of a tipping assembly according to the invention, in combination with a tobacco rod, Figure 6 is an exploded perspective view of the tipping assembly of Figure 5, 30 Figure 7 is a longitudinal section through a fourth embodiment of a tipping assembly according to 30 the invention, in combination with a tobacco rod, Figure 8 is an exploded perspective view of the tipping assembly of Figure 7, Figure 9 is a lateral section through the tipping assemblies of Figures 5 and 7 taken at line IX-IX, Figure 10 is an exploded perspective view of a fifth embodiment of a tipping assembly according to the invention, and 35 Figure 11 is an end view of the tipping assembly of Figure 10 taken in the direction of arrow XI.

Referring to Figures 1 and 2 there is shown a cylindrical tobacco rod 10 enwrapped in cigarette paper 15, and a tipping assembly indicated generally at 100. The tipping assembly 100 comprises an open-ended polyethylene tube 30, 25 mm in length, wrapped in tipping paper 20 by means of which 40 the tube 30 is attached to the tobacco rod 10. The polyethylene tube 30 is provided with four apertures 40 or slots 60 each 3 mm long and 1 mm wide and extending through the wall of the tube 30. The longer axis of each slot 60 is parallel to the longitudinal axis of the tube 30. The slots 60 are equidistantly spaced round the circumference of the tube 30 about half-way along the tube.

The tipping paper 20 is provided with a circumferential series of perforations 70 overlying the 45 slots 60. Typically, the perforations 70 are of 0.80 mm diameter or less. 45 Referring to Figures 3 and 4 there is shown a second embodiment comprising a tobacco rod and tipping assembly similar to that shown in Figures 1 and 2, identical features retaining the same numbering, and further provided with a sheet 50 of porous plug wrap material (of porosity 850-1600 Filtrona K units) between the tube 30 and the perforated tipping paper 20 and a 5 mm plug 40 of 50 acetate filter material at the mouth end of the tube. In this embodiment the tube is 20 mm in length, 50 making an overall tube and plug length of 25 mm.

In an example, cigarettes provided with tipping assemblies according to the embodiments of Figures 1/2 and 3/4 were prepared and compared with a conventional filter cigarette (the control) using standard methods ofanalysis on a smoking machine and were also subjectively assessed by a smoking 55 panel. 55 All the cigarettes in the example, both those of the invention and the control, each had an overall length of 84 mm, a tobacco rod length of 59 mm, a circumference of 25 mm, joining paper length of 29 mm, an oven dry density of 226 kg/cubic metre, a rag nicotine content of 2.55%, and a rag sugar content of 15.5%.

60 The tipping wrapper of each of the cigarettes of the invention was perforated with four holes, one 60 hole above each slot in the tube. The four holes were each about 0.8 mm diameter and 0.75 mm diameter for the embodiments of Figures 1/2 and 3/4 respectively.

The results of the comparisons on the smoking machine are shown in the accompanying Table 1.

2 GB 2 126 073 A 2 TABLE 1

Control Fig. 1/2 Fig. 3/4 Filter type acetate tube tube+acetate Nominal nicotine retention % 63 0 15 Nominal ventilation % 50 so 75 Nominal rag nicotine % 2.6 2.6 2.6 Puff number 9.7 10.0 9.7 PM wnf, mg/cig 4.5 5.5 5.5 Smoke nicotone, mg/cig 0.56 0.93 1.01 Tip dilution % 48.3 79.5 75.6 Pressure drop, mm H20-VO 125 7 31 Pressure drop, mm H20-VC 176 40 61 Tip retention % 65.3 - 14.8 CO, mg/cig 5.8 1.5 2.0 Smoke pH 6.38 6.91 6.82 PWNicotine ratio 8.0 5.9 5.4 COMM ratio 1.30 0.27 0.36 Note: -PM wnf" is an abbreviation for "Particulate material (i.e. tar), water and nicotine free".

It will be observed from Table 1 that, compared with the control, both the embodiments of the invention had lower pressure drops, as would be expected. This had little effect on the dynamic burn rate, and puff numbers for the control and both the embodiments of the invention were similar.

5 Likewise, particulate matter yields for all three cigarettes were reasonably matched. 5 However, it was found that, M smoke nicotine for the cigarettes of the invention was increased significantly over that of the control; (ii) carbon monoxide was greatly reduced for the cigarettes of the invention compared with the control; and, (iii) the COMM (carbon monoxide/pa rti cu late material) ratios for the cigarettes of the invention were low beyond expectation for a 5 mg tar cigarette compared with 10 the control. 10 The smoking panel results showed that the embodiment of Figure 1/2 gave the highest scores for flavour amplitude impact and perceived smoke per puff. These scores were reduced in the embodiment of Figure 3/4 but were still significantly higher than those attributed to the control. The scores obtained in respect of the invention were similar to those expected from at least a 10 mg tar filter cigarette of 15 conventional design. 15 Referring now to Figures 5, 6 and 9 there is shown a third embodiment of the invention comprising a cylindrical tobacco rod 110 enwrapped in cigarette paper 115, and a tipping assembly indicated generally at 1000. The tipping assembly comprises a cellulose acetate filter rod 200 of conventional construction and in abutment therewith an open-ended polyethylene tube 130 wrapped in tipping paper 120 by means of which the tube and filter rod are attached to the toacco rod. 20 The tube 130 is divided into two tubular sections 131 and 132 by three apertures 160 extending round the circumference of the tube 130 and separated by three narrow integral webs 161 of the material of the tubing which hold the two sections 131, 132 in a fixed relationship apart from each other.

25 The tipping paper 120 is provided with a circumferential series of perforations 170 overlying the 25 apertures 160. Typically, the perforations 170 are 0.8 mm diameter or less, considerably smaller than _the width of the apertures 160, which is about 2 mm.

Referring to Figures 7, 8 and fo there is-shown a fourth embodiment comprising a tabacco rod and tipping assembly similar to that of Figures 5, 6 and 9, identical features retaining the same numbering, and further provided with a plug 140 of cellulose acetate filter material at the mouth end of the tube. In 30 3 GB 2 126 073 A 3 this embodiment the tube 130 is substantially shorter than the tube of Figures 5 and 6.

Referring to Figures 10 and 11 there is shown a fifth embodiment similar to that of Figures 5 and 6 except that the separated sections 131, 132 of the tube 130 are held in a fixed relationship to each other not by integral webs but by rectangular vanes 180 of polyethylene extending longitudinally within 5 the tube 130 from one section to the other and radially outwards from the longitudinal axis of the tube 5 to a distance at least equal to the internal radius of the tube.

In further embodiments, not illustrated, any of the third, fourth, and fifth embodiments may be modified by the incorporation of a sheet of porous plug wrap material (of typical porosity 200-1600 Filtrona K units) between the tube and the tipping paper.

10 The tube 130 may be divided into its sections 131, 132 by a number of apertures 160 other than10 three together with the respective number of webs 161 in order to suit specific smoking requirements.

The tube may be filled partly or wholly with highly porous material such as cellulose acetate in the sections 131 or 132. For instance, the filter rod 200 may at least in part occupy section 131.

The tipping assembly of the invention shows that it is possible to achieve low tar yields with high nicotine, low carbon monoxide, and acceptable smoking panel ratings, compared with conventional 15 filters which utilise high levels both of filtration and dilution.

Perforations in the tipping wrapper may be provided by a large number of small perforations or by a small number of relatively large perforations.

The tipping wrapper may alternatively be adapted to permit gas flow through the apertures in the tube by providing a tipping wrapper having a very high porosity rather than by providing perforations. 20 The tube may be made of impervious material other than polyethylene, such as cardboard.

Other shapes, sizes, positions, and number of apertures in the tube may be contemplated in furthe embodiments of the invention.

Claims

25 1. A tipping assembly for an elongate smoking article, and assembly comprising an open-ended 25 tube provided with a plurality of apertures spaced round the circumference of the tube, thereby dividing the tube into two sections and providing communication between the inside and the outside of the tube, and a tipping wrapper surround the tube, wherein the portion of the tipping wrapper overlying the apertures is adapted to permit gas flow both though the apertures and said portion and to offer greater resistance to the gas flow than is provided by the apertures alone. 30
2. An assembly as claimed in claim 1 wherein said portion of the tipping wrapper is adapted to permit gas flow therethrough by means of perforations, the perforations being substantially smaller than the apertures.
3. An assembly as claimed in claim 1 or 2 wherein the apertures are provided by slots.

35
4. An assembly as claimed in claim 3 wherein the major axes of the slots are parallel to the 35 longitudinal axis of the tube.
5. An assembly as claimed in claim 3 wherein the slots are defined by a plurality of webs of tube material parallel to the axis of the tube.
6. An assembly as claimed in claim 5 wherein the width of each web is substantially less than that of an adjacent aperture. 40
7. An assembly as claimed in any preceding claim wherein there is provided a sheet of porous plug wrap material between the tube and the tipping wrapper, at least in the region overlying said apertures.
8. An assembly as claimed in any preceding claim wherein a rod of filter material is provided in axial abutment to, or inserted in, that end of the tube distal to the mouth end 45
9. An assembly as claimed in any preceding claim wherein a rod of filter material is provided in 45 axial abutment to, or inserted in, the mouth end of the tube.
10. An assembly as claimed in claim 1 wherein the two sections of the tube are axially spaced apart from each other and there is provided means to hold the sections fixed relative to each other and to provide the plurality of apertures.

50
11. An assembly as claimed in claim 9 wherein the holding means is provided by a plurality of 50 rectangular vanes extending longitudinally within the tube from one section to the other and radially outwards from the longitudinal axis of the tube to a distance at least equal to the internal radius of the tube.
12. An assembly as claimed in claim 11 wherein the vanes are spaced in a regular angular arrangement about the longitudinal axis of the tube. 55
13. An assembly as claimed in any preceding claim wherein the tube is made of a plastics material.
14. An assembly as claimed in claim 13 wherein the plastics material is polyethylene.